CN203611967U - Brake signal transmission circuit of railway vehicle - Google Patents
Brake signal transmission circuit of railway vehicle Download PDFInfo
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- CN203611967U CN203611967U CN201320752716.8U CN201320752716U CN203611967U CN 203611967 U CN203611967 U CN 203611967U CN 201320752716 U CN201320752716 U CN 201320752716U CN 203611967 U CN203611967 U CN 203611967U
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Abstract
The utility model relates to a brake signal transmission circuit of a railway vehicle, and belongs to the technical field of rail traffic communications. The brake signal transmission circuit comprises a sending circuit and a receiving circuit which are connected through a transmission line, wherein the sending circuit is composed of an insulation optocoupler, a high-low end driver and a field-effect tube, a PWM signal of a TTL level is boosted to be a high-voltage PWM signal, and the receiving circuit carries out voltage reduction on the high-voltage signal through leakage current of the field-effect tube. The mode that a traditional circuit directly transmits an analog signal in a long distance mode is replaced with transmission of the high-voltage PWM signal. The brake signal transmission circuit has the advantages of being simple in design, high in capacity of resisting disturbance and high in transmission accuracy, is applied to important rigid line signals like receiving of brake instructions of subway vehicle brake controllers, and can obviously improve brake accuracy and safety of subway vehicles.
Description
Technical field
The utility model relates to a kind of rail vehicle braking signal circuit, belongs to track traffic communication technical field.
Background technology
Current, the control information of guideway vehicle and status data adopt the bus communication modes such as MVB, RS-485 to transmit, but for the higher signal of the importance such as braking instruction, design hard signal transmission simultaneously and be used as redundancy.For realizing accurate braking, the braking instruction of existing municipal rail train is generally continually varying analog quantity, and the present stage transmission of guideway vehicle analog signals adopts voltage signal or 4-20mA electric current more.For the braking instruction that derives from driver's handle or ATO, transmission distance is (150-200m) far away, and transmission precision requires high, adopts analog voltage transmission to be easily disturbed, the transmission of 4-20mA electric current loop is had relatively high expectations to signal source and transmission line, adopts the cost of which transmission higher.
Utility model content
The technical matters that the utility model solves is: propose a kind of circuit that adopts High-voltage PWM converter signal.
In order to solve the problems of the technologies described above, the technical scheme the utility model proposes is: a kind of rail vehicle braking signal circuit, comprises the transtation mission circuit and the acceptor circuit that connect by transmission route; Described transtation mission circuit comprises the high low-end driver that the first optocoupler is connected with described the first optocoupler mouth with input end; The input anode of described the first optocoupler connects low potential source, and negative pole connects the pwm signal that needs transmission; The high-voltage output end of described high low-end driver is connected to the grid of a N channel enhancement field effect transistor; The low-voltage output of described high low-end driver is connected successively and is connected to the ground of high tension supply after the first resistance and the second resistance, and described the first resistance is connected with the grid of a P-channel enhancement type field effect transistor with the node of the second resistance; The source electrode of described N channel enhancement field effect transistor connects high tension supply, and the source electrode of described P-channel enhancement type field effect transistor connects the ground of high tension supply; Described N channel enhancement field effect transistor links together and is connected the input end of described acceptor circuit as the mouth of described transtation mission circuit by described transmission route with the drain electrode of P-channel enhancement type field effect transistor; Described acceptor circuit comprises N channel depletion type field effect transistor and aerotron, after the drain electrode of described N channel depletion type field effect transistor is connected with the collecting electrode of described aerotron, as the input end of described acceptor circuit, the source electrode of described N channel depletion type field effect transistor is connected with grid by the 3rd resistance; The grid of described N channel depletion type field effect transistor is also connected with the positive pole of the first diode, the negative pole of described the first diode connects the positive pole of a regulator block, the base stage of described aerotron is connected with the grid of described N channel depletion type field effect transistor, after the emitter series limiting resistor of described aerotron, be connected to the negative pole of described regulator block, be connected with the input anode of the second optocoupler, the input cathode of described the second optocoupler is connected with the ground of described high tension supply; The mouth of described the second optocoupler is connected with car two brake system as the mouth of acceptor circuit.
In order to improve the minimum conducting-state voltage of described the second optocoupler input end, prevent from disturbing, between the input anode of the negative pole of described regulator block and described the second optocoupler, be in series with zener diode, the input anode of described the second optocoupler is connected with the positive pole of described zener diode, and the negative pole of described regulator block is connected with the positive pole of described zener diode.
In order to prevent that reverse voltage from damaging circuit component, the input end of described the second optocoupler is parallel with the second diode; The positive pole of described the second diode is connected with the input cathode of described the second optocoupler, and the negative pole of stating the second diode is connected with the input anode of described the second optocoupler; Meanwhile, for filtering spike disturbs, the input end of described the second optocoupler is also parallel with the first filter capacitor.
For preventing from damaging circuit component, drain electrode series connection the 4th resistance of described N channel depletion type field effect transistor is connected the input end as described acceptor circuit with the collecting electrode of the described aerotron of series connection the 5th resistance.
In order further to prevent that reverse voltage from entering circuit and damaging element, described acceptor circuit input end has forward series connection the 3rd diode; Meanwhile, in order to prevent surge voltage, between described acceptor circuit input end and the ground of high tension supply, be provided with pizo-resistance.
Such scheme further improves and is: between the mouth of described the second optocoupler and motor vehicle braking system, be in series with successively Schmidt trigger and low-pass filter.
Described regulator block in the utility model is high precision 2.5V regulator block ZR4040-2.5.
In order to solve the problems of the technologies described above, the another kind of technical scheme the utility model proposes is: a kind of as the method for transmitting signals of foregoing circuit, comprise the following steps:
1), rail vehicle braking signal is carried out to analogue to digital conversion, and be modulated into the pwm signal of 5% to 95% dutycycle of Transistor-Transistor Logic level according to the power of speed-slackening signal;
2), described transtation mission circuit is isolated described pwm signal, boost and is sent to acceptor circuit for the laggard described transmission route of pwm signal of high tension supply level;
3), after receiving the signal of described transtation mission circuit transmission, the input end of described acceptor circuit carries out step-down processing, described step-down is processed specific as follows: in the time of high level that this signal is high tension supply, make described N channel depletion type field effect transistor be operated in drain current state, the drain current of described N channel depletion type field effect transistor provides ideal base drive current for described aerotron, simultaneously also for described the first diode and described regulator block provide forward conduction electric current.After described regulator block work, between its positive pole and negative pole, produce voltage difference, make described transistor emitter positively biased, collecting electrode reverse-biased; Described aerotron is operated in amplification conducting state; The input end of described transistor emitter current drives the second optocoupler; Described the second optocoupler conducting, its output low level; In the time that this signal is low level, described N channel depletion type field effect transistor, described regulator block and described aerotron are not all worked, so now described the second optocoupler does not have incoming signal, and its mouth output high level;
4), the output signal of described the second optocoupler is via Schmidt trigger shaping, reverse, finally by delivering to motor vehicle braking system after low-pass filter filtering.
Such scheme further improves and is: described step 2) in transtation mission circuit concrete process as follows: pwm signal is isolated by described the first optocoupler; Then the output signal of described the first optocoupler is delivered to the input end of described high low-end driver; The high pressure side power supply of described high low-end driver connects described high tension supply, the high pressure side biased electrical crimping sub-high pressure power supply of described high low-end driver, and the power supply of the low pressure side of described high low-end driver connects middle voltage source; Described high tension supply, sub-high pressure power supply, middle voltage source are altogether; Described high tension supply is direct current 60V, and described sub-high pressure power supply is direct current 48V, and described middle voltage source is direct current 15V; In the time that the input end of described high low-end driver receives high level, described high low-end driver high-voltage output end output 60V is to the grid of described N channel enhancement field effect transistor; Now, the VGS of described N channel enhancement field effect transistor is greater than the cut-in voltage of described N channel enhancement field effect transistor, described N channel enhancement field effect transistor by; The low-voltage output output 15V of described high low-end driver, after electric resistance partial pressure, obtain voltage division signal, described voltage division signal is connected to the grid of described P-channel enhancement type field effect transistor, the source electrode of described P-channel enhancement type field effect transistor connects ground, described P-channel enhancement type field effect transistor VGS voltage is greater than the cut-in voltage of described P-channel enhancement type field effect transistor, the conducting of described P-channel enhancement type field effect transistor, the mouth output low level of described transtation mission circuit; In the time that the input end of described high low-end driver receives low level, the low-voltage output output 0V of described high low-end driver is to described P-channel enhancement type fet gate; Now described P-channel enhancement type field effect transistor VGS voltage is less than the cut-in voltage of described P-channel enhancement type field effect transistor, described P-channel enhancement type field effect transistor by; The high-voltage output end output 48V of described high low-end driver is to described N channel enhancement fet gate, the VGS voltage of described N channel enhancement field effect transistor is less than the cut-in voltage of described N channel enhancement field effect transistor, the conducting of described N channel enhancement field effect transistor, by the described high tension supply output being connected with the source electrode of described N channel enhancement field effect transistor, the mouth output 60V of described transtation mission circuit.
A kind of rail vehicle braking signal circuit that the utility model provides, replace directly long Distance Transmission analog signal of traditional circuit by transferring high voltage pwm signal, have that circuit layout is simple, antijamming capability is strong, the feature that transmission precision is high, this circuit application, in important hard signal such as railcar brake controller braking instruction receptions, can obviously be improved to accuracy and the safety of subway train braking.
Accompanying drawing explanation
Be described further of the present utility model below in conjunction with accompanying drawing.
Fig. 1 is the circuit block diagram of a preferred embodiment of the utility model.
Fig. 2 is the transtation mission circuit schematic diagram of Fig. 1.
Fig. 3 is the acceptor circuit schematic diagram of Fig. 1.
The specific embodiment
Embodiment
A kind of rail vehicle braking signal circuit that the present embodiment provides, as shown in Figure 1 to Figure 3, comprises the transtation mission circuit and the acceptor circuit that connect by transmission route; Transtation mission circuit comprises the high low side driver IC 1 (HIGH AND LOW SIDE DRIVER) that the first optocoupler IC2 is connected with the first optocoupler IC2 mouth with input end (HIN AND LIN); The input anode of the first optocoupler IC2 connects low potential source 5V by current-limiting resistance R1, and negative pole connects the pwm signal that needs transmission; The high-voltage output end (HO) of high low side driver IC 1 is connected to the grid of a N channel enhancement field effect transistor Q1; The low-voltage output (LO) of high low side driver IC 1 is connected successively and is connected to the ground of high tension supply direct current 60V after the first resistance R 2 and the second resistance R 3, and the first resistance R 2 is connected with the grid of P-channel enhancement type field effect transistor Q3 with the node of the second resistance R 3; The source electrode of N channel enhancement field effect transistor Q1 connects direct current 60V, and the source electrode of P-channel enhancement type field effect transistor Q2 connects the ground of high tension supply; N channel enhancement field effect transistor Q1 links together and is connected the input end of acceptor circuit as the mouth of transtation mission circuit by transmission route with the drain electrode of P-channel enhancement type field effect transistor Q2; Acceptor circuit comprises N channel depletion type field effect transistor Q3 and aerotron Q4, after the drain electrode of N channel depletion type field effect transistor Q3 is connected with the collecting electrode of aerotron Q4, as the input end of acceptor circuit, the source electrode of N channel depletion type field effect transistor Q3 is connected with grid by the 3rd resistance R 6; The grid of N channel depletion type field effect transistor Q3 is also connected with the positive pole of the first diode D2, the negative pole of the one or two utmost point D2 pipe connects the positive pole of a regulator block IC3, the base stage of aerotron Q4 is connected with the grid of N channel depletion type field effect transistor Q3, after the emitter series limiting resistor R7 of aerotron Q4, be connected to the negative pole of regulator block IC3, be connected with the input anode of the second optocoupler IC4, the input cathode of the second optocoupler IC4 is connected with the ground of direct current 60V; The mouth of the second optocoupler IC4 is connected with car two brake system as the mouth of acceptor circuit.
In order to improve the minimum conducting-state voltage of the second optocoupler IC4 input end, prevent from disturbing, between the input anode of the negative pole of regulator block IC3 and the second optocoupler IC4, be in series with zener diode D3, the input anode of the second optocoupler IC4 is connected with the positive pole of zener diode D3, and the negative pole of regulator block IC3 is connected with the positive pole of zener diode D3; By choosing different stabilivolts, can change the discernibility of circuit.
In order to prevent that reverse voltage from damaging circuit component, the input end of the second optocoupler IC4 is parallel with the second diode D4; The positive pole of the second diode D4 is connected with the input cathode of the second optocoupler IC4, and the negative pole of stating the second diode D4 is connected with the input anode of the second optocoupler IC4; Meanwhile, for filtering spike disturbs, the input end of the second optocoupler IC4 is also parallel with the first filter capacitor C2.
For preventing from damaging circuit component, drain electrode series connection the 4th resistance R 4 of N channel depletion type field effect transistor Q3 is connected the input end as acceptor circuit with the collecting electrode of the aerotron Q4 of series connection the 5th resistance R 5.
In order further to prevent that reverse voltage from entering circuit and damaging element, acceptor circuit input end has forward series connection the 3rd diode D; Meanwhile, in order to prevent surge voltage, between acceptor circuit input end and the ground of high tension supply, be provided with pizo-resistance ZNR1.
Meanwhile, in order to guarantee that signal is more accurate, the low-pass filter that is in series with successively Schmidt trigger IC5 between the mouth of the second optocoupler IC4 and motor vehicle braking system and is formed by resistance R 8 and filter capacitor C3.
Regulator block IC3 in the present embodiment adopts high precision 2.5V regulator block ZR4040-2.5.
In the present embodiment, the equal direct current 5V power supply of the first optocoupler IC2 and the second optocoupler IC4, the VCC end of high low side driver IC 1 and the first optocoupler IC2 adopts direct current 15V power supply, the Vb end of high low side driver IC 1 adopts direct current 60V power supply, Vs end adopts direct current 48V power supply, wherein, direct current 15V, direct current 48V, direct current 60V are altogether.
The concrete processing method of circuit of the present embodiment comprises the steps:
1), rail vehicle braking signal is carried out to analogue to digital conversion, and be modulated into the pwm signal of 5% to 95% dutycycle of Transistor-Transistor Logic level according to the power of speed-slackening signal;
2), by the first optocoupler IC2, pwm signal is isolated; Then boost as the pwm signal of 60V level through high low side driver IC 1, be then sent to acceptor circuit by transmission route;
3), after receiving the signal of transtation mission circuit transmission, the input end of acceptor circuit carries out step-down processing, step-down is processed specific as follows: when this signal is that 60V is when flat, this 60V high level just makes N channel depletion type field effect transistor Q3 be operated in drain current state, the drain current of N channel depletion type field effect transistor Q3 provides ideal base drive current for aerotron Q4, simultaneously also for the first diode D2 and regulator block IC3 provide forward conduction electric current.After regulator block IC3 work, between its positive pole and negative pole, produce 2.5V voltage difference, make aerotron Q4 emitter positively biased, collecting electrode reverse-biased; Aerotron Q3 is operated in amplification conducting state; Aerotron Q3 emitter current drives the input end of the second optocoupler IC4; The second optocoupler IC4 conducting, due to the present embodiment adopt be reverse optocoupler, so its output low level.In the time that this signal is low level, N channel depletion type field effect transistor Q3, regulator block IC3 and aerotron Q4 all do not work, so now the second optocoupler IC4 does not have incoming signal, and its mouth output high level;
4), the output signal of the second optocoupler IC4 is via Schmidt trigger IC5 shaping, reverse, finally by delivering to motor vehicle braking system after low-pass filter filtering.
Step 2) in transtation mission circuit concrete process as follows: the pwm signal of Transistor-Transistor Logic level is isolated by the first optocoupler IC2; Then the output signal of the first optocoupler IC2 is delivered to the input end of high low side driver IC 1; In the time that the input end of high low side driver IC 1 receives high level, the grid of high low side driver IC 1 high-voltage output end output 60V to N channel enhancement field effect transistor Q1; Now, the VGS of N channel enhancement field effect transistor Q1 is greater than the cut-in voltage of N channel enhancement field effect transistor Q1, N channel enhancement field effect transistor Q1 by; The low-voltage output output 15V of high low side driver IC 1, after electric resistance partial pressure, obtain voltage division signal, voltage division signal is connected to the grid of P-channel enhancement type field effect transistor Q2, the source electrode of P-channel enhancement type field effect transistor Q2 connects ground, the VGS voltage of P-channel enhancement type field effect transistor Q2 is greater than the cut-in voltage of P-channel enhancement type field effect transistor Q2, P-channel enhancement type field effect transistor Q2 conducting, the mouth output low level of transtation mission circuit; In the time that the input end of high low side driver IC 1 receives low level, the low-voltage output output 0V of high low side driver IC 1 is to P-channel enhancement type field effect transistor Q2 grid; Now the VGS voltage of P-channel enhancement type field effect transistor Q2 is less than the cut-in voltage of P-channel enhancement type field effect transistor Q2, P-channel enhancement type field effect transistor Q2 by; High-voltage output end output 48V to the N channel enhancement field effect transistor Q1 grid of high low side driver IC 1, the VGS voltage of N channel enhancement field effect transistor Q1 is less than the cut-in voltage of N channel enhancement field effect transistor Q1, N channel enhancement field effect transistor Q1 conducting, the mouth output 60V of transtation mission circuit.
The concrete technical scheme that is not limited to above-described embodiment of the present utility model, the technical scheme that all employings are equal to replacement formation is the protection domain that the utility model requires.
Claims (7)
1. a rail vehicle braking signal circuit, comprises the transtation mission circuit and the acceptor circuit that connect by transmission route; It is characterized in that: described transtation mission circuit comprises the high low-end driver that the first optocoupler is connected with described the first optocoupler mouth with input end; The input anode of described the first optocoupler connects low potential source, and negative pole connects the pwm signal that needs transmission; The high-voltage output end of described high low-end driver is connected to the grid of a N channel enhancement field effect transistor; The low-voltage output of described high low-end driver is connected successively and is connected to the ground of high tension supply after the first resistance and the second resistance, and described the first resistance is connected with the grid of a P-channel enhancement type field effect transistor with the node of the second resistance; The source electrode of described N channel enhancement field effect transistor connects high tension supply, and the source electrode of described P-channel enhancement type field effect transistor connects the ground of high tension supply; Described N channel enhancement field effect transistor links together and is connected the input end of described acceptor circuit as the mouth of described transtation mission circuit by described transmission route with the drain electrode of P-channel enhancement type field effect transistor; Described acceptor circuit comprises N channel depletion type field effect transistor and aerotron, after the drain electrode of described N channel depletion type field effect transistor is connected with the collecting electrode of described aerotron, as the input end of described acceptor circuit, the source electrode of described N channel depletion type field effect transistor is connected with grid by the 3rd resistance; The grid of described N channel depletion type field effect transistor is also connected with the positive pole of the first diode, the negative pole of described the first diode connects the positive pole of a regulator block, the base stage of described aerotron is connected with the grid of described N channel depletion type field effect transistor, after the emitter series limiting resistor of described aerotron, be connected to the negative pole of described regulator block, be connected with the input anode of the second optocoupler, the input cathode of described the second optocoupler is connected with the ground of described high tension supply; The mouth of described the second optocoupler is connected with car two brake system as the mouth of acceptor circuit.
2. rail vehicle braking signal circuit according to claim 1, it is characterized in that: between the negative pole of described regulator block and the input anode of described the second optocoupler, be in series with zener diode, the input anode of described the second optocoupler is connected with the positive pole of described zener diode, and the negative pole of described regulator block is connected with the positive pole of described zener diode.
3. rail vehicle braking signal circuit according to claim 2, is characterized in that: the input end of described the second optocoupler is parallel with the second diode and the first filter capacitor; The positive pole of described the second diode is connected with the input cathode of described the second optocoupler, and the negative pole of stating the second diode is connected with the input anode of described the second optocoupler.
4. rail vehicle braking signal circuit according to claim 1, is characterized in that: linking together as the input end of described acceptor circuit after collecting electrode series connection the 5th resistance of drain electrode series connection the 4th resistance of described N channel depletion type field effect transistor, described aerotron.
5. rail vehicle braking signal circuit according to claim 4, is characterized in that: described acceptor circuit input end has forward series connection the 3rd diode; Between described acceptor circuit input end and the ground of high tension supply, be provided with pizo-resistance.
6. rail vehicle braking signal circuit according to claim 1, is characterized in that: between the mouth of described the second optocoupler and motor vehicle braking system, be in series with successively Schmidt trigger and low-pass filter.
7. rail vehicle braking signal circuit according to claim 1, is characterized in that: described regulator block is high precision 2.5V regulator block ZR4040-2.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320752716.8U CN203611967U (en) | 2013-11-26 | 2013-11-26 | Brake signal transmission circuit of railway vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320752716.8U CN203611967U (en) | 2013-11-26 | 2013-11-26 | Brake signal transmission circuit of railway vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN203611967U true CN203611967U (en) | 2014-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320752716.8U Withdrawn - After Issue CN203611967U (en) | 2013-11-26 | 2013-11-26 | Brake signal transmission circuit of railway vehicle |
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| CN (1) | CN203611967U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103587517A (en) * | 2013-11-26 | 2014-02-19 | 南京浦镇海泰制动设备有限公司 | Rail vehicle braking signal transmission circuit |
| CN114442519A (en) * | 2021-12-20 | 2022-05-06 | 南京铁道职业技术学院 | Rail vehicle sliding fault simulation system |
-
2013
- 2013-11-26 CN CN201320752716.8U patent/CN203611967U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103587517A (en) * | 2013-11-26 | 2014-02-19 | 南京浦镇海泰制动设备有限公司 | Rail vehicle braking signal transmission circuit |
| CN103587517B (en) * | 2013-11-26 | 2015-12-16 | 南京浦镇海泰制动设备有限公司 | A kind of rail vehicle braking signal circuit |
| CN114442519A (en) * | 2021-12-20 | 2022-05-06 | 南京铁道职业技术学院 | Rail vehicle sliding fault simulation system |
| CN114442519B (en) * | 2021-12-20 | 2023-09-22 | 南京铁道职业技术学院 | Rail vehicle slides trouble analog system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140528 Effective date of abandoning: 20151216 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |