CN102969693B - Electronic control valve driving protective circuit of railway vehicles - Google Patents
Electronic control valve driving protective circuit of railway vehicles Download PDFInfo
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- CN102969693B CN102969693B CN201210178073.0A CN201210178073A CN102969693B CN 102969693 B CN102969693 B CN 102969693B CN 201210178073 A CN201210178073 A CN 201210178073A CN 102969693 B CN102969693 B CN 102969693B
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Abstract
An electronic control valve driving protective circuit of railway vehicles is mainly formed by a main control chip, a monitoring chip, a power switch driving chip, a relay, a three-state gate, a comparator, a reference voltage source, a high-end current detection circuit and the like. The main control chip is mainly responsible for driving control of a valve, the monitoring chip is mainly responsible for monitoring circuit states at each level of the driving circuit, and the main control chip and the monitoring chip jointly control a driving return circuit. The main control chip and the monitoring chip switch information through a serial communication interface. The electronic control valve driving protective circuit solves the problem in the existing electronic control valve driving return circuit. The single monitoring chip is used for conducting status surveillance and protection on the driving return circuit of an electro-pneumatic changeover valve, states of the driving return circuit are fed back to the main control chip, the monitoring chip can locate fault points of the driving return circuit, fault safety guidance can be achieved, and relevant protection procedures can be carried out.
Description
Technical field
The present invention relates to a kind of rail vehicle electrically-controlled valve Drive Protecting Circuit, belong to metro braking control system technical field.
Background technology
The ferroelectric idle running in ground is changed valve and is comprised antiskid valve and EP valve, and the drive circuit of the empty switching valve of electricity of domestic existing metro braking controller exists following shortcoming: 1. the driving of pair electric pneumatic valve only has output feedack to detect, and lacks defencive function; 2. when drive circuit lost efficacy, fault point can not accurately be located, and not easily well realizes failure safe guiding.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the above-mentioned deficiency of prior art, provides a kind of rail vehicle electrically-controlled valve Drive Protecting Circuit, solves the empty switching valve drive circuit of existing electricity and lacks the problem monitoring and protect.
In order to solve above technical problem, rail vehicle electrically-controlled valve Drive Protecting Circuit provided by the invention, composition comprises: power switch driving chip, the power input of described power switch driving chip is connected with power supply through relay, the power output end of described power switch driving chip is connected with electrically-controlled valve, characterized by further comprising: main control chip, monitor chip, relay drive circuit, relay status feedback circuit, output feedack circuit, triple gate, described main control chip communicates with one another with supervision chip, first control signal output of described main control chip, monitor that the first control signal output of chip is connected with relay drive circuit, the signal output part of relay status feedback circuit respectively with main control chip, supervision chip connects, the signal input part of output feedack circuit is connected with the power output end of power switch driving chip, the signal output part of output feedack circuit is connected with supervision chip, the diagnostic signal output of power switch driving chip is connected with main control chip, second control signal output of described main control chip respectively with the logic input terminal mouth of triple gate, supervision chip is connected, monitor that the second control signal output of chip is connected with the control inputs port of triple gate, the signal output part of described triple gate is connected with the control signal input of power switch driving chip.
The drived control of main control chip primary responsibility valve, monitors that the at different levels circuit states of chip primary responsibility to drive circuit monitor, the supervision comprise the supervision to relay status, exporting to power switch driving chip.Main control chip and supervision chip are by serial communication interface exchange message.The present invention adopts the drive circuit of independent supervision chip to the empty switching valve of electricity to carry out Stateful Inspection and protection, and by the state feedback of drive circuit to main control chip; 2. monitor that chip can position drive circuit fault point, realize failure safe guiding better, and implement relevant safeguard measure.
The present invention further improves and is: be in series with current sampling resistor between described relay and power supply, and described current sampling resistor is parallel with high-side current detection circuit, and the signal output part of described high-side current detection circuit is connected with main control chip.Main control chip is also monitored power supply.
Further, described relay drive circuit comprises the PNP triode, the NPN triode that are series at relay two ends, first control signal output of described main control chip is extremely connected with the control of PNP triode by PNP drive circuit, monitors that the first control signal output of chip is extremely connected with the control of NPN triode by NPN drive circuit.In order to improve fail safe, relay two ends also can reverse parallel connection fly-wheel diode.Visible main control chip of the present invention and supervision chip implement protection to drive circuit jointly, improve fail safe.
Further, described relay is double-pole single-throw (D.P.S.T.) relay, first output of this relay is connected with the power input of power switch driving chip, second output of relay is connected with relay status feedback circuit, described relay status feedback circuit composition comprises the first comparator, first divider resistance of series connection and the second divider resistance, described first divider resistance is connected on the second output of relay, second divider resistance connects power supply ground, the anode input of the first comparator and first, wire between second divider resistance connects, the negative electrode input of the first comparator is connected with reference voltage source, the signal output part of described first comparator respectively with main control chip, supervision chip connects.
Further, described output feedack circuit composition comprises the second comparator, the 3rd divider resistance of series connection and the 4th divider resistance, described 3rd divider resistance is connected on the power output end of power switch driving chip, 4th divider resistance connects power supply ground, wire between the anode input and the 3rd of the second comparator, the 4th divider resistance is connected, the negative electrode input of the second comparator is connected with reference voltage source, and the signal output part of described second comparator is connected with supervision chip.
Described electrically-controlled valve is the one in electric empty switching valve, antiskid valve.
Rail vehicle electrically-controlled valve Drive Protecting Circuit structure of the present invention is simple and clear, improves the reliability of braking system, fail safe, maintenanceability and testability.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of rail vehicle electrically-controlled valve Drive Protecting Circuit of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the clearly aid illustration embodiment of the present invention.
As shown in Figure 1, embodiment of the present invention rail vehicle electrically-controlled valve Drive Protecting Circuit, composition comprises: power switch driving chip, the power input of power switch driving chip is connected with 24V power supply through relay, the power output end of power switch driving chip and this example of the empty switching valve L1(of electricity are for electrical control switching valve, the present invention can also carry out driving protection to antiskid valve) be connected, it also comprises: main control chip, monitor chip, relay drive circuit, relay status feedback circuit, output feedack circuit, triple gate, main control chip communicates with one another (UART) with supervision chip, first control signal S1 output of main control chip, monitor that the first control signal S2 output of chip is connected with relay drive circuit, the relay status feedback signal FR output of relay status feedback circuit respectively with main control chip, supervision chip connects, the signal input part of output feedack circuit is connected with the power output end of power switch driving chip, the output feedback signal FO output of output feedack circuit is connected with supervision chip, the diagnostic signal output of power switch driving chip is connected with main control chip, in this example, power switch driving chip has two diagnostic signal DIA1, DIA2 output, be connected with main control chip respectively by wire, second control signal PWM 1 output of main control chip respectively with the logic input terminal mouth of triple gate, supervision chip is connected, monitor that the second control signal OE output of chip is connected with the control inputs port of triple gate, the control signal PWM2 output of triple gate is connected with the control signal input of power switch driving chip.In this example, be in series with current sampling resistor R1 between relay and power supply, current sampling resistor R1 is parallel with high-side current detection circuit, and the current detection signal Is output of high-side current detection circuit is connected with main control chip.
In this example, as shown in Figure 1, relay drive circuit comprises the PNP triode Q1, the NPN triode Q2 that are series at relay two ends, first control signal S1 output of main control chip is extremely connected with the control of PNP triode Q1 by PNP drive circuit, monitors that the first control signal S2 output of chip is extremely connected with the control of NPN triode Q2 by NPN drive circuit.Relay is double-pole single-throw (D.P.S.T.) relay, first output of this relay is connected with the power input of power switch driving chip, second output of relay is connected with relay status feedback circuit, relay status feedback circuit composition comprises the first comparator, first divider resistance R4 of series connection and the second divider resistance R5, first divider resistance R4 is connected on the second output of relay, second divider resistance R5 connects power supply ground, the anode input VR and first of the first comparator, wire between second divider resistance connects, the negative electrode input of the first comparator is connected with reference voltage source Vref, the relay status FR output of the first comparator respectively with main control chip, supervision chip connects.
In this example, output feedack circuit composition comprises the second comparator, the 3rd divider resistance R2 of series connection and the 4th divider resistance R3,3rd divider resistance R2 is connected on the power output end of power switch driving chip, 4th divider resistance R3 connects power supply ground, wire between the anode input VO and the 3rd of the second comparator, the 4th divider resistance is connected, the negative electrode input of the second comparator is connected with reference voltage source Vref, and the output feedback signal FO output of the second comparator is connected with supervision chip.
During normal work, the working current loop of the empty switching valve of electricity flows through current sampling resistor R1 from 24V power supply, flow through relay again, power to power switch driving chip, again from power switch driving chip output current, flow into the empty switching valve of load electricity, then flow back to power switch driving chip, then flow into power supply ground.
The two ends of current sampling resistor R1 adopt high-side current detection circuit to monitor the size of current of load circuit, current sampling resistor is the sampling with high precision resistance of 0.1 Ω, be connected on the high-end of the current supply circuit of electric empty switching valve, pass through high-side current detection circuit, the performance loop electric current of the empty switching valve of electricity is sampled and amplified, the integrated chip that high-side current detection circuit uses has the single supply sensor interface differential operational amplifier AD22057 of AD company and rail-to-rail operational amplifier A D822, the current signal Is detected is delivered to the AD mouth of main control chip by high-side current detection circuit, gathered by main control chip and convert, obtain loop current value, according to the rated current normal range (NR) of the empty switching valve of the electricity of work at present, monitor load whether overcurrent or open circuit.
It is double-pole single-throw (D.P.S.T.) relay that relay adopts, K1, K2 synchronization action, and wherein K1 purposes is the switch in load current I_Load loop, and K2 is used for the supervision of relay status.When relay obtains electric, K1, K2 close simultaneously, electric current is that power switch driving chip is powered by K1, K2 makes detection electric current I _ Check flow to power supply ground by the first divider resistance R4 and the second divider resistance R5, first divider resistance R4 resistance is 57.6K Ω, 4th divider resistance R5 resistance is 10K Ω, and current sampling resistor R1 resistance is negligible relative to first, second divider resistance R4, R5, and the first partial pressure value VR so obtained is 3.55V.Reference voltage V ref is produced by reference voltage source, and magnitude of voltage is 2.5V, and reference voltage source uses the TL431 of TI company integrated chip.First partial pressure value VR and reference voltage V ref compares through the first comparator and obtains relay status feedback signal FR, first partial pressure value VR is greater than reference voltage V ref, so the first comparator exports as high level, namely when relay closes, relay status feedback signal FR is high level.In like manner, when relay electric-loss enters, K1, K2 disconnect simultaneously, and electric current I _ Check is 0, and now, the first partial pressure value VR equals 0, is less than reference voltage V ref, so relay status feedback signal FR is low level.Main control chip and supervision chip all gather relay status feedback signal FR.
Power switch driving chip is the industrial intelligent integrated power switch L6370 of ST company, for driving electric empty switching valve, L6370 has two diagnostic signal DIA1 and DIA2, supervision chip is sent to by serial communication interface after being gathered by main control chip, monitor that chip is again in conjunction with the output signal PWM2 of triple gate and the output feedback signal FO of power switch chip, can monitor the operating state of power switch driving chip.Wherein, output feedback signal FO is the result that power switch driving chip forward output end voltage compares through the second comparator with reference voltage V ref through the second partial pressure value VO that the 3rd divider resistance R2 and the 4th divider resistance R3 obtains, and principle is the same.Main control chip can monitor that power switch driving chip is normal, load open circuit, be shorted to power supply, be shorted to ground, export DMOS open circuit, cross seven states such as gentle line under-voltage.
Because each link of the working current loop to the empty switching valve of electricity has carried out the design of monitoring circuit; when monitoring fault; can position fault point very clearly and classify, realize train fault better and lead safely, and implement relevant safeguard measure in time.
In this example, the control of relay is by main control chip and monitor that chip completes jointly, and the first control signal S1 of main control chip makes PNP triode Q1 conducting or cut-off by PNP drive circuit, thus the upper end current circuit of control relay coil; Monitor that the first control signal S2 of chip makes the Q2 conducting of NPN triode or cut-off by NPN drive circuit, thus the lower current loop of control relay coil.Therefore; when any one chip detection in main control chip and supervision chip is to catastrophe failure; and when needing the power supply disconnecting electric empty switching valve to protect; the power supply of block system relay coil voluntarily can make its dead electricity; thus disconnection relay contact; stop the power supply to power switch driving chip, to protect electric empty switching valve not damaged.Relay status feedback signal FR is gathered by main control chip and supervision chip simultaneously, when one of them power operation to relay coil of two chips lost efficacy, another chip can detect the state of relay in time, perform the power operation of the other end, the Redundancy Design of two pieces of circuit improves the reliability of circuit.
It should be noted that, during normal work, the second control signal PWM1 is produced by main control chip, deliver to triple gate, after monitoring that chip collects the second control signal PWM1 signal confirmation normally of main control chip simultaneously, self PWM mouth is set to high resistant, and to export the second control signal OE be low, the output signal PWM2 of enable triple gate equals the second control signal PWM1 of main control chip; When the second control signal PWM1 that supervision chip collects main control chip is judged as occurring abnormal; monitor that chip exports the second control signal OE for high; make triple gate be in high-impedance state, disconnect the signal source of output signal PWM2, and perform necessary safeguard measure according to the order of severity of fault.
The guard method realizing circuit of the drive circuit of electric empty switching valve in the present invention, when monitoring catastrophe failure, mainly contains the safeguard measure of drive circuit:
1, phase place, the duty ratio of triple gate output signal PWM2 is adjusted in time by main control chip;
2, by main control chip or monitor chip controls relay, power-off is carried out to power switch driving chip
3, by monitoring that chip exports the second control signal OE for high, making triple gate be in high-impedance state, namely disconnecting the drive singal of power switch chip.
In addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of application claims.
Claims (7)
1. rail vehicle electrically-controlled valve Drive Protecting Circuit, composition comprises: power switch driving chip, the power input of described power switch driving chip is connected with power supply through relay, the power output end of described power switch driving chip is connected with electrically-controlled valve, characterized by further comprising: main control chip, monitor chip, relay drive circuit, relay status feedback circuit, output feedack circuit, triple gate, described main control chip communicates with one another with supervision chip, first control signal output of described main control chip, monitor that the first control signal output of chip is connected with relay drive circuit, the signal output part of relay status feedback circuit respectively with main control chip, supervision chip connects, the signal input part of output feedack circuit is connected with the power output end of power switch driving chip, the signal output part of output feedack circuit is connected with supervision chip, the diagnostic signal output of power switch driving chip is connected with main control chip, second control signal output of described main control chip respectively with the logic input terminal mouth of triple gate, supervision chip is connected, monitor that the second control signal output of chip is connected with the control inputs port of triple gate, the signal output part of described triple gate is connected with the control signal input of power switch driving chip, described relay is double-pole single-throw (D.P.S.T.) relay, first output of this relay is connected with the power input of power switch driving chip, second output of relay is connected with relay status feedback circuit, described relay status feedback circuit composition comprises the first comparator, first divider resistance of series connection and the second divider resistance, described first divider resistance is connected on the second output of relay, second divider resistance connects power supply ground, the anode input of the first comparator and first, wire between second divider resistance connects, the negative electrode input of the first comparator is connected with reference voltage source, the signal output part of described first comparator respectively with main control chip, supervision chip connects.
2. rail vehicle electrically-controlled valve Drive Protecting Circuit according to claim 1; it is characterized in that: between described relay and power supply, be in series with current sampling resistor; described current sampling resistor is parallel with high-side current detection circuit, and the signal output part of described high-side current detection circuit is connected with main control chip.
3. rail vehicle electrically-controlled valve Drive Protecting Circuit according to claim 2; it is characterized in that: described relay drive circuit comprises the PNP triode, the NPN triode that are series at relay two ends; first control signal output of described main control chip is extremely connected with the control of PNP triode by PNP drive circuit, monitors that the first control signal output of chip is extremely connected with the control of NPN triode by NPN drive circuit.
4. rail vehicle electrically-controlled valve Drive Protecting Circuit according to claim 3, is characterized in that: described relay reverse parallel connection has fly-wheel diode.
5. rail vehicle electrically-controlled valve Drive Protecting Circuit according to claim 3; it is characterized in that: described output feedack circuit composition comprises the second comparator, the 3rd divider resistance of series connection and the 4th divider resistance; described 3rd divider resistance is connected on the power output end of power switch driving chip; 4th divider resistance connects power supply ground; wire between the anode input and the 3rd of the second comparator, the 4th divider resistance is connected; the negative electrode input of the second comparator is connected with reference voltage source, and the signal output part of described second comparator is connected with supervision chip.
6. rail vehicle electrically-controlled valve Drive Protecting Circuit according to claim 4, is characterized in that: described power switch driving chip has two diagnostic signal outputs, is connected with main control chip respectively by wire.
7. rail vehicle electrically-controlled valve Drive Protecting Circuit according to claim 5, is characterized in that: described electrically-controlled valve is the one in electric empty switching valve, antiskid valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210178073.0A CN102969693B (en) | 2012-05-31 | 2012-05-31 | Electronic control valve driving protective circuit of railway vehicles |
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| CN201210178073.0A CN102969693B (en) | 2012-05-31 | 2012-05-31 | Electronic control valve driving protective circuit of railway vehicles |
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| CN102969693A CN102969693A (en) | 2013-03-13 |
| CN102969693B true CN102969693B (en) | 2015-04-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104865958A (en) * | 2015-05-04 | 2015-08-26 | 株洲南车时代电气股份有限公司 | Matrix switch device, system and method |
| CN105223491B (en) * | 2015-09-23 | 2017-11-10 | 常州大学 | One kind driving protection simulating test device |
| CN106740570B (en) * | 2016-12-01 | 2023-04-14 | 深圳市知行智驱技术有限公司 | Control feedback circuit of intelligent drain valve of vehicle gas circuit and fault diagnosis method of drain valve |
| CN108011562B (en) * | 2017-12-12 | 2019-08-30 | 珠海格力电器股份有限公司 | Frequency converter dynamic braking control circuit, frequency converter and its dynamic braking control method |
| CN112019003A (en) * | 2020-08-18 | 2020-12-01 | 重庆智行者信息科技有限公司 | Load driving circuit with full diagnosis function built by discrete components |
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| CN101323310A (en) * | 2008-07-22 | 2008-12-17 | 南车株洲电力机车有限公司 | Brake control unit for locomotive electro-pneumatic brake |
| CN201616653U (en) * | 2009-12-24 | 2010-10-27 | 南车南京浦镇车辆有限公司 | Drive protection circuit used for EP valve and skid-proof valve |
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Address after: 211800 No. 10, prosperous road, Nanjing, Jiangsu Patentee after: Nanjing Zhongche town Haitai Brake Equipment Co Ltd Address before: 211800 No. 10, prosperous road, Nanjing, Jiangsu Patentee before: Nanjing Puzhen Haitai Brake Equipment Co., Ltd. |