CN101251286B - System and method for controlling emergency draft of air conditioner - Google Patents
System and method for controlling emergency draft of air conditioner Download PDFInfo
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- CN101251286B CN101251286B CN2007100033310A CN200710003331A CN101251286B CN 101251286 B CN101251286 B CN 101251286B CN 2007100033310 A CN2007100033310 A CN 2007100033310A CN 200710003331 A CN200710003331 A CN 200710003331A CN 101251286 B CN101251286 B CN 101251286B
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Abstract
The invention provides a control system for emergency ventilation for an air conditioning and a method thereof, adopting a circuit design of a filter circuit and an inverter structure which are used by a direct current loop and an alternating current loop in common, and driving the emergency ventilator to operate by a three-phase alternating-current supply with a higher frequency and a higher voltage value performing an inversion after the direct current is boosted. Integrated detecting and switching loops of alternating current and direct current are adopted, and the alternating current and the direct current use the same group of the filter circuit and the inverter in common to achieve the simplification of a circuit structure and improve the integration capability of the control system. Alternating current and direct current option circuits of the control system comprises contacts (KM1), (KM2) and a thermistance, wherein a main contact of the contactor (KM1) is connected in a loop of a direct current input circuit, and the main contact of the contactor (KM2) is connected in a loop of an alternating current input circuit (2); the thermistance is connected with a normally closed auxiliary contact of the contactor (KM1) in series, and is connected on a group of contacts of the contactor (KM2).
Description
Technical field
The present invention relates to a kind of emergency ventilation control system and method thereof, be applied to the air-conditioner of rail vehicle particularly.
Background technology
On various rail vehicles, adopt at present the air-conditioning system of air return type at large, carry out the ventilation circulation and the adjustment of interior air.
As be applied to the air-conditioner of subway inside, all need carry out the emergency ventilation Treatment Design owing to be subjected to the restriction of special running environment.Cutting off the power supply when out of service when subway takes place, is the safety that guarantees passenger in the compartment, and the Vehicular accumulator cell that needs to provide for oneself by subway under the situation of no ac power electricity carries out direct current supply for the emergency ventilation machine, with guarantee compartment inner air circulation cycle normally.
Subway emergency draft of air conditioner control device shown in the accompanying drawing 1 of back, under the situation that line voltage cuts off the power supply or the auxiliary AC power of subway all lost efficacy, main control MCU is connected the accumulator DC of reserve, is the three-phase alternating-current supply of low frequency, low pressure by the emergency ventilation inverter with the DC110V power inverter, to drive the work of emergency ventilation machine.
Existing emergency draft of air conditioner control method only is the switching in direct current, alternating current loop, and direct current and alternating current loop are provided with filter circuit and inverter separately, the integrated circuit complex structure, is unfavorable for the integrated and miniaturization design of control circuit.
And what drive the work of emergency ventilation machine is to be the three-phase alternating-current supply of low frequency, low pressure through DC110V power supply dc inversion, so the rotating speed of ventilation blower is lower, is unfavorable for ensureing under case of emergency the ventilation in the compartment.
Summary of the invention
Emergency draft of air conditioner control system of the present invention and method thereof, be to address the above problem and adopt the circuit design of shared filter circuit of direct current and alternating current loop and inverter structure, and what drive the work of emergency ventilation machine is to carry out the higher-frequency of inversion, the three-phase alternating-current supply of higher voltage value behind the DC boosting again.
The objective of the invention is to, adopt integrated AC and DC to detect and switching circuit, AC and DC shared one group of filter circuit of electricity and inverter are to realize simplifying circuit structure, the integrated ability of raising control system.
Goal of the invention also is, the DC110V power supply of connecting is first through after boosting, carry out the three-phase alternating current power supply mode of inversion again, under the prerequisite that dc source inserts, can guarantee that still ventilation blower turns round under high-revolving state, enough ventilations are arranged in the compartment in case of emergency to ensure.
For realizing above-mentioned purpose of design, described emergency draft of air conditioner control system mainly has following structure:
Its ac input circuit selects circuit to connect ac rectifier by alternating current-direct current, and direct-flow input circuit connects the DC filtering circuit after selecting the output-parallel of circuit and ac rectifier by alternating current-direct current again;
The DC filtering circuit is connected with ventilation blower by inverter, and the main control MCU circuit selects circuit, inverter, air returning valve and new air-valve to be connected with testing circuit, alternating current-direct current respectively.
Improvements of the present invention are that the alternating current-direct current of described control system is selected circuit, comprises first contactor and second contactor.The main contacts of first contactor is connected in the loop of direct-flow input circuit, and the main contacts of second contactor is connected in the loop of ac input circuit.
At the auxiliary normally-closed contact of first contactor PTC type thermistor of connecting, and be connected on one group of contact of second contactor.
As above-mentioned scheme feature, whether normal by the input power supply that testing circuit detects ac input circuit by main control MCU.
When detecting under the AC power normal condition, carry out Alternating Current Power Supply to ventilation blower, otherwise power to ventilation blower by direct-flow input circuit.
When main control MCU detected no alternating current input power supplying, second contactor was disconnected, and first contactor is by adhesive simultaneously, and DC loop is switched on.
PTC type thermistor has positive temperature coefficient, and promptly when electric current passed through it, temperature raise.Along with the rising of temperature, it is big that resistance becomes.
PTC type thermistor is serially connected in the length of first contactor and closes on the auxiliary contact, and when first contactor was in off-state, this contact was closed; Otherwise, then be in off-state.
Because AC and DC shared one group of filter circuit of electricity and inverter, so the circuit structure of overall system control is simplified.
Further improvement project is, described direct-flow input circuit is selected circuit and DC voltage booster circuit series connection by alternating current-direct current, and DC voltage booster circuit is connected with main control MCU by peripheral control circuit.
And the technical characterictic of more refinement can be in described DC voltage booster circuit, to adopt a boost inductance forward one series diode, the positive pole of the drain electrode connection diode of an igbt.
To carry out the magnitude of voltage of the three-phase alternating current after the inversion higher because the DC110V power supply after connecting, then inserts inverter in advance through boosting, and can guarantee that thus ventilation blower turns round under high-revolving state.
For preventing the reversal connection of direct current positive and negative electrode, at the input of the direct-flow input circuit diode of can connecting.
Also can connect a three-phase alternating current wave filter, so that filtered alternating current is carried out rectification by the rectifier bridge that second contactor is connected in the described ac rectifier at the input of ac input circuit.
Use above scenario-frame, emergency draft of air conditioner control method of the present invention is:
When air-conditioner just powered on, alternating current-direct current selected second contactor, first contactor in the circuit all to be in off-state; Thermistor is connected in the ac circuit, with the impact that prevents to power on to the DC filtering circuit.The main control MCU of air-conditioner is by testing circuit, and whether the input power supply that detects ac input circuit is normal; When detecting under the AC power normal condition, carry out Alternating Current Power Supply to ventilation blower;
When main control MCU detected no alternating current input power supplying, alternating current-direct current selected second contactor in the circuit to be disconnected, and first contactor is by adhesive simultaneously, and DC loop is switched on, and the auxiliary normally-closed contact of first contactor is disconnected from DC loop.
Need the connection DC loop when being in an emergency after, direct-flow input circuit inserts inverter by DC voltage booster circuit, and the direct current of 110V drives ventilation blower work through after boosting again through inversion.
Content to sum up, the advantage of described emergency draft of air conditioner control system and method thereof is:
1, its AC and DC shared one group of filter circuit of electricity and inverter, the total system circuit is simplified, and helps improving the integrated level of control circuit.
2, carry out the power supply mode of inversion after the DC110V power supply boosts again, can guarantee effectively that ventilation blower turns round under high-revolving state, can ensure has enough ventilations in the compartment.
Description of drawings
Fig. 1 is existing emergency ventilation schematic representation of apparatus;
Fig. 2 is the module map of emergency draft of air conditioner control system of the present invention;
Fig. 3 is the structural representation of described emergency draft of air conditioner control system;
Fig. 4 is the schematic diagram of described DC voltage booster circuit.
The specific embodiment
Embodiment 1, extremely shown in Figure 4 as Fig. 2, described emergency draft of air conditioner control system mainly includes direct-flow input circuit 1, ac input circuit 2, alternating current-direct current selection circuit 3, DC voltage booster circuit 4, ac rectifier 5, DC filtering 6, inverter 7, ventilation blower 8, line control machine 9, air returning valve 10, new air-valve 11, main control MCU 12, testing circuit 13 and General controller 14.
Wherein, ac input circuit 2 selects circuit 3 to connect ac rectifier 5 by alternating current-direct current.
Direct-flow input circuit 1 selects circuit 3 to connect DC voltage booster circuits 4 by alternating current-direct current, and DC voltage booster circuit 4 connects DC filtering circuit 6 after must exporting output-parallel with ac rectifier 5.
DC filtering circuit 6 is connected with ventilation blower 8 by inverter 7, and main control MCU circuit 12 selects circuit 3, inverter 7, air returning valve 10 and new air-valve 11 to be connected with testing circuit 13, alternating current-direct current respectively.
Ac rectifier 5 is carried out by three-phase commutation bridge BR1.
Main control MCU 12 adopts the TMP86FS49 of Toshiba chips, is the main control part of whole air-conditioner, and it carries out communication with miscellaneous parts such as the compressor of controlling air-conditioning, electric expansion valves by communication bus and General controller 14, line control machine 9.
The alternating current-direct current of described control system is selected circuit 3, comprises the first contactor KM1, the second contactor KM2 and PTC type thermistor; The main contacts of the first contactor KM1 connects in the loop of direct-flow input circuit 1, the main contacts of the second contactor KM2 connects in the loop of ac input circuit 2, the auxiliary normally-closed contact of the first contactor KM1 PTC type thermistor of connecting, and be connected on 1 group of contact of the second contactor KM2.
Described direct-flow input circuit 1 is selected circuit 3 and DC voltage booster circuit 4 series connection by alternating current-direct current, and DC voltage booster circuit 4 is connected with main control MCU 12 by peripheral control circuit.
Described DC voltage booster circuit 4, its boost inductance L1 forward series diode D2, the drain electrode of insulated gate transistor IGBT connects the positive pole of diode D2.
In DC filtering circuit 6, first capacitor C 1,2 series connection of second capacitor C, first resistance R 1 is parallel to first capacitor C, 1, the second resistance R 2 and is parallel to second capacitor C 2.
Diode D1 who prevents the reversal connection of direct current positive and negative electrode of input series connection at direct-flow input circuit 1.
Input at ac input circuit 2 connects a three-phase alternating current wave filter LB1, and the AC power of input is carried out filtering.
Described inverter 7 comprises the inversion module IPM that is made up of insulated-gate type the first transistor Q1 to the six transistor Q6.The first transistor Q1 and the 4th transistor Q4 series connection, transistor seconds Q2 and the 5th transistor Q5 series connection, the 3rd transistor Q3 and the 6th transistor Q6 series connection;
The source electrode of the first transistor Q1 connects the drain electrode of the 4th transistor Q4, and the source electrode of transistor seconds Q2 connects the drain electrode of the 5th transistor Q5, and the source electrode of the 3rd transistor Q3 connects the drain electrode of the 6th transistor Q6;
The drain electrode of the first transistor Q1, transistor seconds Q2 and the 3rd transistor Q3 is connected the anode of inverter 7 direct currents input respectively;
The source electrode of the 4th transistor Q4, the 5th transistor Q5 and the 6th transistor Q6 is connected the negative terminal of inverter 7 direct currents input respectively.
Described emergency draft of air conditioner control method, its groundwork flow process is:
Select the input power supply of circuit 3 detection ac input circuits 2 whether normal by main control MCU 12 by alternating current-direct current;
When detecting under the AC power normal condition, connect AC power, three-phase alternating current is by after the wave filter LB1 filtering, and the rectifier bridge BR1 that is connected to ac rectifier 5 by the second contactor KM2 carries out rectification.
By behind the inverter 7, work after the rectification for ventilation blower 8.
Ventilation blower uses the AC380V power supply to power 8 this moments.Simultaneously, new air-valve 11, air returning valve 10 are closed or opened to main control MCU 12 as required.
When opening new air-valve 11, outdoor fresh air after room air mixes, blows to indoor by ventilation blower 8 by new air-valve 11.
Close new air-valve 11, when only opening air returning valve 10, then air only circulates at interior.
When main control MCU 12 detected no alternating current input power supplying, alternating current-direct current selected the second contactor KM2 in the circuit 3 to be disconnected, and the first contactor KM1 is by adhesive simultaneously, and DC loop is switched on, and the auxiliary normally-closed contact of the first contactor KM1 is disconnected from DC loop.
It more than is the major control flow process of emergency draft of air conditioner control method of the present invention.
When described air-conditioner had just powered on, alternating current-direct current selected the second contactor KM2, the first contactor KM1 in the circuit 3 all to be in off-state.PTC type thermistor is connected in the ac circuit, and the two-phase power supply in the connection three-phase alternating current is to capacitor precharge in the DC filtering circuit 6, to prevent the impact that powers on.Thermistor has positive temperature coefficient, and promptly when electric current passed through it, temperature raise, and along with the rising of temperature, it is big that resistance becomes.
Thermistor PTC is serially connected in the length of the first contactor KM1 and closes on the auxiliary contact, and when the first contactor KM1 was in off-state, this contact was closed.Otherwise, then be in off-state.
Even the first contactor KM1 or the second contactor KM2 do not move owing to fault, PTC type thermistor is serially connected in the electric power loop for a long time, can not cause fault yet, because increase along with electric current in the circuit, increasing of PTC type temperature increment on thermal resistor, it is big that its resistance value becomes, and plays the effect that the restriction electric current increases.
Connect after the DC loop, direct-flow input circuit 1 inserts inverter 7 by DC voltage booster circuit 4.
Dc source rises to higher dc source by boost module with DC110V, and then inserts inverter 7.Drive ventilation blower work again by inversion.
New air-valve 11 is opened in main control MCU 12 controls simultaneously, under the effect of ventilation blower 8, outdoor fresh air is blowed to indoor, reaches the effect of emergency ventilation.
Various duties all can be passed through communication bus, deliver to line control machine 9 or General controller 14 shows.
DC voltage booster circuit 4 adopts the PFC of Sanyo module STK762-921 chip, and the inside modules structure as shown in Figure 4.
Because the emergency draft of air conditioner control system has increased the processing of boosting, the input direct voltage rising with inverter 7 can in case of emergency still can be turned round ventilation blower 8 with higher rate, has ensured ventilation.
Claims (10)
1. emergency draft of air conditioner control system, its ac input circuit (2) selects circuit (3) to connect ac rectifier (5) by alternating current-direct current;
Direct-flow input circuit (1) connects DC filtering circuit (6) after selecting the output-parallel of circuit (3) and ac rectifier (5) by alternating current-direct current;
DC filtering circuit (6) is connected with ventilation blower (8) by inverter (7), and main control MCU (12) circuit selects circuit (3), inverter (7), air returning valve (10) and new air-valve (11) to be connected with testing circuit (13), alternating current-direct current respectively,
It is characterized in that: the alternating current-direct current of described control system is selected circuit (3), comprises first contactor (KM1), second contactor (KM2) and PTC type thermistor;
The main contacts of first contactor (KM1) connects in the loop of direct-flow input circuit (1), the main contacts of second contactor (KM2) connects in the loop of ac input circuit (2), the auxiliary normally-closed contact series connection PTC type thermistor of first contactor (KM1), PTC type thermistor is connected on 1 group of contact of second contactor (KM2).
2. emergency draft of air conditioner control system according to claim 1, it is characterized in that: described direct-flow input circuit (1) is selected circuit (3) and DC voltage booster circuit (4) series connection by alternating current-direct current, and DC voltage booster circuit (4) is connected with main control MCU (12) by peripheral control circuit.
3. emergency draft of air conditioner control system according to claim 2, it is characterized in that: described DC voltage booster circuit (4), its boost inductance (L1) forward series diode (D2), the drain electrode of igbt (IGBT) connects the positive pole of diode (D2).
4. according to claim 1,2 or 3 described emergency draft of air conditioner control systems, it is characterized in that: in DC filtering circuit (6), first electric capacity (C1), second electric capacity (C2) series connection, first resistance (R1) is parallel to first electric capacity (C1), and second resistance (R2) is parallel to second electric capacity (C2).
5. emergency draft of air conditioner control system according to claim 4 is characterized in that: at diode (D1) that prevents the reversal connection of direct current positive and negative electrode of input series connection of direct-flow input circuit (1).
6. emergency draft of air conditioner control system according to claim 5 is characterized in that: the input at ac input circuit (2) connects a three-phase alternating current wave filter (LB1).
7. emergency draft of air conditioner control system according to claim 6 is characterized in that: described inverter (7) comprises the inversion module of being made up of insulated-gate type the first transistor (Q1) to the 6th transistor (Q6) (IPM), wherein,
The first transistor (Q1) and the 4th transistor (Q4) series connection, transistor seconds (Q2) and the 5th transistor (Q5) series connection, the 3rd transistor (Q3) and the 6th transistor (Q6) series connection;
The source electrode of the first transistor (Q1) connects the drain electrode of the 4th transistor (Q4), and the source electrode of transistor seconds (Q2) connects the drain electrode of the 5th transistor (Q5), and the source electrode of the 3rd transistor (Q3) connects the drain electrode of the 6th transistor (Q6);
The drain electrode of the first transistor (Q1), transistor seconds (Q2) and the 3rd transistor (Q3) is connected the anode of inverter (7) direct current input respectively;
The source electrode of the 4th transistor (Q4), the 5th transistor (Q5) and the 6th transistor (Q6) is connected the negative terminal of inverter (7) direct current input respectively.
8. emergency draft of air conditioner control method, whether its main control MCU (12) is normal by detecting the interchange input, and by alternating current-direct current selection circuit (3) selection direct current supply or Alternating Current Power Supply, it is characterized in that: when described air-conditioner had just powered on, alternating current-direct current selected first contactor (KM2), second contactor (KM1) in the circuit (3) all to be in off-state;
PTC type thermistor is connected in the ac circuit, and the two-phase power supply in the connection three-phase alternating current is to capacitor precharge in the DC filtering circuit (6).
9. emergency draft of air conditioner control method according to claim 8 is characterized in that: when detecting under the AC power normal condition, power for ventilation blower (8) by ac circuit;
When main control MCU (12) detects under the AC power normal condition, alternating current-direct current is selected second contactor (KM2) adhesive in the circuit (3), first contactor (KM1) still is in off-state, after three-phase alternating-current supply passes through alternating current filter (LB1), second contactor (KM2), insert inverter (7) through ac rectifier (5), DC filtering circuit (6), the output of inverter drives ventilation blower work.
10. according to Claim 8 or 9 described emergency draft of air conditioner control methods, it is characterized in that: during no alternating current input power supplying, power for ventilation blower (8) by DC loop;
When main control MCU (12) detects AC power when undesired, alternating current-direct current selects second contactor (KM2) in the circuit (3) to be disconnected, first contactor (KM1) is by adhesive subsequently, and DC loop is switched on, and the auxiliary normally-closed contact of first contactor (KM1) is disconnected from DC loop;
Connect after the DC loop, direct-flow input circuit (1) inserts inverter (7) by DC voltage booster circuit (4); The direct current of 110V drives ventilation blower (8) work through after boosting again through inversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007100033310A CN101251286B (en) | 2007-02-02 | 2007-02-02 | System and method for controlling emergency draft of air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100033310A CN101251286B (en) | 2007-02-02 | 2007-02-02 | System and method for controlling emergency draft of air conditioner |
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| Publication Number | Publication Date |
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| CN101251286A CN101251286A (en) | 2008-08-27 |
| CN101251286B true CN101251286B (en) | 2011-04-20 |
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| CN2007100033310A Expired - Fee Related CN101251286B (en) | 2007-02-02 | 2007-02-02 | System and method for controlling emergency draft of air conditioner |
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| CN107196490A (en) * | 2017-06-12 | 2017-09-22 | 中车青岛四方车辆研究所有限公司 | The control method of power circuit, railway vehicle air conditioner and power circuit |
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| CN108899989A (en) * | 2018-07-27 | 2018-11-27 | 苏州伟创电气设备技术有限公司 | A kind of alternating current-direct current automatic switchover power supply system |
| US11760394B2 (en) * | 2019-05-07 | 2023-09-19 | Mitsubishi Electric Corporation | Air-conditioning control system for railroad vehicle |
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| CN114572262A (en) * | 2020-12-01 | 2022-06-03 | 山东朗进科技股份有限公司 | Rail vehicle, rail vehicle ventilation system and control method thereof |
| CN113581233B (en) * | 2021-07-23 | 2022-06-17 | 石家庄国祥运输设备有限公司 | Control method of air-conditioning ventilator of railway vehicle |
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| CN2819620Y (en) * | 2005-04-04 | 2006-09-20 | 青岛朗进软件有限公司 | DC booster circuit of air conditioner |
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|---|---|---|---|---|
| US5593347A (en) * | 1992-10-02 | 1997-01-14 | Man-D-Tec, Inc. | Emergency ventilation system for elevator cab |
| DE10057113A1 (en) * | 2000-11-16 | 2002-05-29 | K & G Pneumatik Gmbh | Power supply for flue and heat discharge systems, comprises control system with charge condition monitoring unit which is connected with main accumulator |
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