CN203722211U - Phase break protection device used for railway vehicle emergency inverter - Google Patents
Phase break protection device used for railway vehicle emergency inverter Download PDFInfo
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- CN203722211U CN203722211U CN201420127319.6U CN201420127319U CN203722211U CN 203722211 U CN203722211 U CN 203722211U CN 201420127319 U CN201420127319 U CN 201420127319U CN 203722211 U CN203722211 U CN 203722211U
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- 238000001514 detection method Methods 0.000 claims abstract description 36
- 230000003750 conditioning effect Effects 0.000 claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 description 10
- 238000004378 air conditioning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Abstract
The utility model discloses a phase break protection device used for a railway vehicle emergency inverter. The phase break protection device comprises a phase brake detection circuit, a reference voltage circuit, a signal conditioning circuit, a charge and discharge comparison output circuit and a DSP. When a three-phase power supply normally supplies power, the phase break detection circuit outputs a low level to be compared with the reference voltage of the reference voltage circuit, the charge and discharge comparison output circuit is made to output a high level to the DSP by enabling the signal conditioning circuit to output a low level, the DSP judges that the three-phase power supply works normally, and the fault protection action is not conducted. When phase break happens to the three-phase power supply, the phase break detection circuit outputs discontinuous half cycle sine waves to be compared with the reference voltage of the reference voltages circuit, impulse waves with a certain duty ratio are output through the signal conditioning circuit, the charge and discharge comparison output circuit is made to output a low level to the DSP, the DSP judges that the phase break happens to the three-phase power supply, and the fault protection action is not conducted. The phase break protection device is reliable in performance and can well protect devices.
Description
Technical field
The utility model relates to a kind of rail vehicle emergency inverter phase-lacking protective device, belongs to rail vehicle accessory power supply output open-phase protection technical field.
Background technology
Rail vehicle is in the time of normal operation, a series of requirements such as the air exchange system in compartment can satisfied temperature, humidity, cleanliness factor, air velocity, but in the time of ac power power-fail, air-conditioning system proceeds to emergency ventilation state automatically, emergency ventilation uses air-conditioning evaporation fan, provide 110V power supply to power by emergency inverter fan by storage battery, in compartment, send into new wind, to ensure passenger's health and safety.But emergency inverter only could fan normal power supply in the situation that three-phase equilibrium is powered, otherwise by damage equipment, jeopardizes passenger safety.Therefore, being necessary to provide a kind of phase-lacking protective device to carry out guarantee equipment normally moves.
Traditional phase-lacking protective device is made up of thermal relay and circuit breaker etc. conventionally, but these protective devices produce sometimes misoperation or be failure to actuate, very easily damage equipment, thus do not have protective effect, in addition, the cost of these protective devices is also higher.The Chinese invention patent application that is CN102684161A as publication number discloses a kind of loss-of-phase protection arrangement; it is formed by connecting by stop button, start button, A.C. contactor, indicator light and auxiliary relay; this protective device A.C. contactor and button produce sometimes misoperation, and its components and parts cost is also higher.
In addition; also have some phase-lacking protective devices to adopt all electronic circuit to build; the Chinese utility model patent that is CN202975878U as publication number discloses a kind of Intelligent humiture controller; it has adopted a kind of open-phase protection circuit; but what this protective circuit detected in the time of phase shortage is a kind of discontinuous half-sinusoid; nonnumeric logical signal, therefore protects effect still undesirable.
Summary of the invention
The technical problems to be solved in the utility model is to provide one and can avoids producing misoperation or being failure to actuate, and can play the rail vehicle emergency inverter phase-lacking protective device of good protection effect to equipment.
For solving the problems of the technologies described above, the utility model adopts so a kind of rail vehicle emergency inverter phase-lacking protective device, and this protective device comprises lack detection circuit, reference voltage circuit, signal conditioning circuit, discharges and recharges comparison output circuit and DSP microprocessor, described lack detection circuit is for detection of whether phase shortage of three phase mains, in the time of three phase mains normal power supply, lack detection circuit output low level, and compare with the reference voltage that reference voltage circuit produces, give and discharge and recharge comparison output circuit by signal conditioning circuit output low level, make to discharge and recharge comparison output circuit output high level to DSP microprocessor, DSP microprocessor judges that according to this signal three phase mains is normal, does not carry out error protection action, in the time of open phases of three-phase power source, lack detection circuit is exported discontinuous half-sinusoid, and compare with the reference voltage that reference voltage circuit produces, export the impulse wave with certain duty ratio by signal conditioning circuit, in the time of low level stage in impulse wave, make to discharge and recharge the electric discharge of comparison output circuit, in the time of high level stage in impulse wave, make to discharge and recharge the charging of comparison output circuit, by to filling, the control of discharge regime time, make to discharge and recharge comparison output circuit output low level to DSP microprocessor, DSP microprocessor judges open phases of three-phase power source fault according to this signal, carry out error protection action.
As a kind of preferred implementation of the present utility model, described lack detection circuit is by the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the first diode, the second diode, the 3rd diode, the first optocoupler, the second optocoupler and the 3rd optocoupler composition, one end of described the first resistance is connected with the U of three phase mains, the other end and the first optocoupler luminous end anode, the negative electrode of the first diode is connected, and the negative electrode of the first optocoupler luminous end is connected with the first diode anode, and one end of the second resistance is connected with the V of three phase mains, the other end and the second optocoupler luminous end anode, the negative electrode of the second diode is connected, and the negative electrode of the second optocoupler luminous end is connected with the second diode anode, and the 3rd one end of resistance and the W of three phase mains are connected, the other end and the 3rd optocoupler luminous end anode, the negative electrode of the 3rd diode is connected, and the negative electrode of the 3rd optocoupler luminous end is connected with the 3rd diode anode, and first, second, the anode of the 3rd diode is connected, the collector electrode of the first optocoupler light-receiving end is connected with one end of the 4th resistance, the other end of the 4th resistance connects power supply VCC, the collector electrode of the second optocoupler light-receiving end is connected with one end of the 5th resistance, the other end of the 5th resistance connects power supply VCC, the collector electrode of the 3rd optocoupler light-receiving end is connected with one end of the 6th resistance, and the other end of the 6th resistance connects power supply VCC, first, second, the connected ground connection of emitter of the 3rd optocoupler light-receiving end, this lack detection circuit is through the emitter of the first optocoupler light-receiving end, the emitter of the second optocoupler light-receiving end, the emitter output of the 3rd optocoupler light-receiving end.
Described reference voltage circuit is made up of the 7th resistance, the 8th resistance and the first electric capacity, one end of described the 7th resistance is connected with power supply VCC, the other end is connected with the 8th resistance, the first electric capacity, the other end of the 8th resistance, the first electric capacity is connected to the ground, and reference voltage circuit is through the 7th resistance and the output of the 8th resistance connecting place.
Described signal conditioning circuit is by the 9th resistance, the first comparator, the second comparator and the 3rd comparator composition, described the first comparator, the in-phase end of the second comparator and the 3rd comparator is connected with the corresponding output of described lack detection circuit respectively, the first comparator, the second comparator, the 3rd end of oppisite phase of comparator and the output of reference voltage circuit are connected, the first comparator, the output of the second comparator and the 3rd comparator is connected with the 9th resistance respectively, the other end of the 9th resistance is connected with power supply VCC, this signal conditioning circuit is through the first comparator, the output output of the second comparator and the 3rd comparator.
The described comparison output circuit that discharges and recharges is by the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the second electric capacity, NPN triode, PNP triode, the 4th diode, the 5th diode, the 4th comparator composition, the base stage of described NPN triode is connected with the output of described signal conditioning circuit, grounded emitter, the base stage of collector electrode and PNP triode, the tenth resistance is connected, the other end of the tenth resistance is connected with the negative electrode of the 4th diode, and the anode of the 4th diode is connected with power supply VCC, and the emitter of PNP triode is connected with the 11 resistance, the 11 resistance other end is connected with power supply VCC, the collector electrode of PNP triode and the 12 resistance, the second electric capacity, the end of oppisite phase of the 4th comparator is connected, the 12 resistance, the other end of the second electric capacity is connected to the ground, the in-phase end of the 4th comparator and the output of described reference voltage circuit, the 5th diode anode is connected, the 5th diode cathode is connected with power supply VCC, the output of the 4th comparator is connected with one end of the 13 resistance, and the other end of the 13 resistance is connected with power supply+5V, and this discharges and recharges the output output signal NOPHASE of comparison output circuit through the 4th comparator.
Adopt after said structure, the utility model is in the time of work, lack detection circuit will detect whether phase shortage of three phase mains, in the time of three phase mains normal power supply, lack detection circuit output low level, and compare with the reference voltage that reference voltage circuit produces, by signal conditioning circuit output low level, discharge and recharge NPN triode in comparison output circuit, PNP triode all turn-offs, comparator output high level is to DSP microprocessor, DSP microprocessor is normally controlled, and illustrates that three phase mains normally works, and does not carry out error protection action, in the time of open phases of three-phase power source, lack detection circuit is exported discontinuous half-sinusoid, and compare with the reference voltage that reference voltage circuit produces, signal conditioning circuit is output as the impulse wave with certain duty ratio, in the time of low level stage in impulse wave, NPN triode and PNP triode all turn-off, the electric capacity of comparator end of oppisite phase discharges to resistance, in the time of high level stage in impulse wave, NPN triode and all conductings of PNP triode, preferably 15V power supply charges to the electric capacity of comparator end of oppisite phase, by to filling, the control of discharge regime time, voltage on maintenance electric capacity is greater than the in-phase end level of comparator, comparator output low level is to DSP microprocessor, DSP microprocessor judges open phases of three-phase power source fault according to this signal, DSP microprocessor power ratio control unit drive signals is turn-offed and is carried out error protection action.
The utility model dependable performance, simple in structure, with low cost, can play a good protection to equipment.
Brief description of the drawings
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 is a kind of circuit block diagram of the utility model rail vehicle emergency inverter phase-lacking protective device.
Fig. 2 is a kind of circuit diagram of the utility model rail vehicle emergency inverter phase-lacking protective device.
Embodiment
Referring to a kind of rail vehicle emergency inverter phase-lacking protective device shown in Fig. 1,2, this protective device comprises lack detection circuit, reference voltage circuit, signal conditioning circuit, discharges and recharges comparison output circuit and DSP microprocessor, described lack detection circuit is for detection of whether phase shortage of three phase mains, in the time of three phase mains normal power supply, lack detection circuit output low level, and compare with the reference voltage that reference voltage circuit produces, give and discharge and recharge comparison output circuit by signal conditioning circuit output low level, make to discharge and recharge comparison output circuit output high level to DSP microprocessor, DSP microprocessor judges that according to this signal three phase mains is normal, does not carry out error protection action, in the time of open phases of three-phase power source, lack detection circuit is exported discontinuous half-sinusoid, and compare with the reference voltage that reference voltage circuit produces, export the impulse wave with certain duty ratio by signal conditioning circuit, in the time of low level stage in impulse wave, make to discharge and recharge the electric discharge of comparison output circuit, in the time of high level stage in impulse wave, make to discharge and recharge the charging of comparison output circuit, by to filling, the control of discharge regime time, make to discharge and recharge comparison output circuit output low level to DSP microprocessor, DSP microprocessor judges open phases of three-phase power source fault according to this signal, carry out error protection action.
As a kind of preferred embodiment of the present utility model, as shown in Figure 2, described lack detection circuit is by the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the first diode D1, the second diode D2, the 3rd diode D3, the first optocoupler L1, the second optocoupler L2 and the 3rd optocoupler L3 composition, described first one end of resistance R 1 and the U of three phase mains are connected, the other end and the first optocoupler L1 luminous end anode, the negative electrode of the first diode D1 is connected, and the negative electrode of the first optocoupler L1 luminous end is connected with the first diode D1 anode, and second one end of resistance R 2 and the V of three phase mains are connected, the other end and the second optocoupler L2 luminous end anode, the negative electrode of the second diode D2 is connected, and the negative electrode of the second optocoupler L2 luminous end is connected with the second diode D2 anode, and the 3rd one end of resistance R 3 and the W of three phase mains are connected, the other end and the 3rd optocoupler L3 luminous end anode, the negative electrode of the 3rd diode D3 is connected, and the negative electrode of the 3rd optocoupler L3 luminous end is connected with the 3rd diode D3 anode, and first, second, the 3rd diode D1, D2, the anode of D3 is connected, the collector electrode of the first optocoupler L1 light-receiving end is connected with one end of the 4th resistance R 4, and the other end of the 4th resistance R 4 connects power supply VCC, and the collector electrode of the second optocoupler L2 light-receiving end is connected with one end of the 5th resistance R 5, the other end of the 5th resistance R 5 connects power supply VCC, the collector electrode of the 3rd optocoupler L3 light-receiving end is connected with one end of the 6th resistance R 6, and the other end of the 6th resistance R 6 connects power supply VCC, first, second, the 3rd optocoupler L1, L2, the connected ground connection of emitter of L3 light-receiving end, this lack detection circuit is through the emitter of the first optocoupler L1 light-receiving end, the emitter of the second optocoupler L2 light-receiving end, the emitter output of the 3rd optocoupler L3 light-receiving end.
Described reference voltage circuit is made up of the 7th resistance R 7, the 8th resistance R 8 and the first capacitor C 1, one end of described the 7th resistance R 7 is connected with power supply VCC, the other end is connected with the 8th resistance R 8, the first capacitor C 1, the other end of the 8th resistance R 8, the first capacitor C 1 is connected to the ground, and reference voltage circuit is through the 7th resistance R 7 and the 8th resistance R 8 connecting place outputs.
Described signal conditioning circuit is by the 9th resistance R 9, the first comparator U1A, the second comparator U1B and the 3rd comparator U2B composition, described the first comparator U1A, the in-phase end of the second comparator U1B and the 3rd comparator U2B is connected with the corresponding output of described lack detection circuit respectively, the first comparator U1A, the second comparator U1B, the 3rd end of oppisite phase of comparator U2B and the output of reference voltage circuit are connected, the first comparator U1A, the output of the second comparator U1B and the 3rd comparator U2B is connected with the 9th resistance R 9 respectively, the other end of the 9th resistance R 9 is connected with power supply VCC, this signal conditioning circuit is through the first comparator U1A, the output output of the second comparator U1B and the 3rd comparator U2B.
The described comparison output circuit that discharges and recharges is by the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the second capacitor C 2, NPN triode P2, PNP triode P1, the 4th diode D4, the 5th diode D5, the 4th comparator U2A composition, the base stage of described NPN triode P2 is connected with the output of described signal conditioning circuit, grounded emitter, the base stage of collector electrode and PNP triode P1, the tenth resistance R 10 one end are connected, the other end of the tenth resistance R 10 is connected with the negative electrode of the 4th diode D4, the anode of the 4th diode D4 is connected with power supply VCC, the emitter of PNP triode P1 is connected with the 11 resistance R 11 one end, the 11 resistance R 11 other ends are connected with power supply VCC, the collector electrode of PNP triode P1 and the 12 resistance R 12, the second capacitor C 2, the end of oppisite phase of the 4th comparator U2A is connected, the 12 resistance R 12, the other end of the second capacitor C 2 is connected to the ground, the in-phase end of the 4th comparator U2A and the output of described reference voltage circuit, the 5th diode D5 anode is connected, the 5th diode D5 negative electrode is connected with power supply VCC, the output of the 4th comparator U2A is connected with one end of the 13 resistance R 13, the other end of the 13 resistance R 13 is connected with power supply+5V, and this discharges and recharges the output output signal NOPHASE of comparison output circuit through the 4th comparator U2A.
The utility model is in the time of work, first lack detection circuit detects U, V, W three-phase, to U, V, W three-phase power line voltage maximum sometime any two-phase detect, then corresponding optocoupler break-make, export corresponding level through signal conditioning circuit again, control and discharge and recharge comparison output circuit, discharge and recharge comparison output circuit and output signal to DSP microprocessor, DSP microprocessor judges whether phase shortage according to this signal, thereby moves accordingly.In the time that three phase mains is normal, lack detection circuit output low level, for example, sometime, U, line voltage maximum between V two-phase, first, the second resistance R 1, R2, the second diode D2, the circuit working of the first optocoupler L1 composition, the first optocoupler L1 conducting, lack detection circuit output low level, by with the comparison of reference voltage that reference voltage circuit produces, signal conditioning circuit output low level, discharge and recharge NPN triode P2 in comparison output circuit, PNP triode P1 turn-offs, 15V power supply cannot charge to the second capacitor C 2, discharge and recharge in the second capacitor C 2 is low level, export high level to DSP microprocessor through the 4th comparator U2A, DSP microprocessor judges that according to this signal three phase mains is normal, do not carry out error protection action.In the time of open phases of three-phase power source, lack detection circuit is exported discontinuous half-sinusoid, compare by the reference voltage producing with reference voltage circuit, signal conditioning circuit output has the impulse wave of certain duty ratio, for example lack W phase time, first, the second resistance R 1, R2, the second diode D2, the circuit working of the first optocoupler L1 composition, there is the impulse wave of certain duty ratio by the first comparator U1A output, in the time that the value of lack detection circuit output is less than the reference voltage value that reference voltage circuit produces, signal conditioning circuit output low level, discharging and recharging NPN triode P2 and PNP triode P1 in comparison output circuit all turn-offs, the second capacitor C 2 is discharged, in the time that the value of lack detection circuit output is greater than reference voltage value, signal conditioning circuit output high level, discharge and recharge NPN triode P2 in comparison output circuit, the equal conducting of PNP triode P1, 15V power supply charges to the electric capacity of the 4th comparator U2A end of oppisite phase, by to filling, the control of discharge regime time, keep voltage in the second capacitor C 2 to be greater than the in-phase end level of the 4th comparator U2A, discharge and recharge comparison output circuit output low level to DSP microprocessor, open phases of three-phase power source fault is described, DSP microprocessor power ratio control unit drive signals is turn-offed.
Claims (2)
1. a rail vehicle emergency inverter phase-lacking protective device, is characterized in that: this protective device comprises lack detection circuit, reference voltage circuit, signal conditioning circuit, discharges and recharges comparison output circuit and DSP microprocessor, described lack detection circuit is for detection of whether phase shortage of three phase mains, in the time of three phase mains normal power supply, lack detection circuit output low level, and compare with the reference voltage that reference voltage circuit produces, give and discharge and recharge comparison output circuit by signal conditioning circuit output low level, make to discharge and recharge comparison output circuit output high level to DSP microprocessor, DSP microprocessor judges that according to this signal three phase mains is normal, does not carry out error protection action, in the time of open phases of three-phase power source, lack detection circuit is exported discontinuous half-sinusoid, and compare with the reference voltage that reference voltage circuit produces, export the impulse wave with certain duty ratio by signal conditioning circuit, in the time of low level stage in impulse wave, make to discharge and recharge the electric discharge of comparison output circuit, in the time of high level stage in impulse wave, make to discharge and recharge the charging of comparison output circuit, by to filling, the control of discharge regime time, make to discharge and recharge comparison output circuit output low level to DSP microprocessor, DSP microprocessor judges open phases of three-phase power source fault according to this signal, carry out error protection action.
2. rail vehicle emergency inverter phase-lacking protective device according to claim 1, it is characterized in that: described lack detection circuit is by the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the first diode (D1), the second diode (D2), the 3rd diode (D3), the first optocoupler (L1), the second optocoupler (L2) and the 3rd optocoupler (L3) composition, one end of described the first resistance (R1) is connected with the U of three phase mains, the other end and the first optocoupler (L1) luminous end anode, the negative electrode of the first diode (D1) is connected, the negative electrode of the first optocoupler (L1) luminous end is connected with the first diode (D1) anode, one end of the second resistance (R2) is connected with the V of three phase mains, the other end and the second optocoupler (L2) luminous end anode, the negative electrode of the second diode (D2) is connected, the negative electrode of the second optocoupler (L2) luminous end is connected with the second diode (D2) anode, one end of the 3rd resistance (R3) is connected with the W of three phase mains, the other end and the 3rd optocoupler (L3) luminous end anode, the negative electrode of the 3rd diode (D3) is connected, the negative electrode of the 3rd optocoupler (L3) luminous end is connected with the 3rd diode (D3) anode, first, second, the 3rd diode (D1, D2, D3) anode is connected, the collector electrode of the first optocoupler (L1) light-receiving end is connected with one end of the 4th resistance (R4), the other end of the 4th resistance (R4) connects power supply VCC, the collector electrode of the second optocoupler (L2) light-receiving end is connected with one end of the 5th resistance (R5), the other end of the 5th resistance (R5) connects power supply VCC, the collector electrode of the 3rd optocoupler (L3) light-receiving end is connected with one end of the 6th resistance (R6), the other end of the 6th resistance (R6) connects power supply VCC, first, second, the 3rd optocoupler (L1, L2, L3) the connected ground connection of the emitter of light-receiving end, this lack detection circuit is through the emitter of the first optocoupler (L1) light-receiving end, the emitter of the second optocoupler (L2) light-receiving end, the emitter output of the 3rd optocoupler (L3) light-receiving end,
Described reference voltage circuit is made up of the 7th resistance (R7), the 8th resistance (R8) and the first electric capacity (C1), one end of described the 7th resistance (R7) is connected with power supply VCC, the other end is connected with the 8th resistance (R8), the first electric capacity (C1), the other end of the 8th resistance (R8), the first electric capacity (C1) is connected to the ground, and reference voltage circuit is through the 7th resistance (R7) and the 8th resistance (R8) connecting place output;
Described signal conditioning circuit is by the 9th resistance (R9), the first comparator (U1A), the second comparator (U1B) and the 3rd comparator (U2B) composition, described the first comparator (U1A), the in-phase end of the second comparator (U1B) and the 3rd comparator (U2B) is connected with the corresponding output of described lack detection circuit respectively, the first comparator (U1A), the second comparator (U1B), the end of oppisite phase of the 3rd comparator (U2B) is connected with the output of reference voltage circuit, the first comparator (U1A), the output of the second comparator (U1B) and the 3rd comparator (U2B) is connected with the 9th resistance (R9) respectively, the other end of the 9th resistance (R9) is connected with power supply VCC, this signal conditioning circuit is through the first comparator (U1A), the output output of the second comparator (U1B) and the 3rd comparator (U2B),
The described comparison output circuit that discharges and recharges is by the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the second electric capacity (C2), NPN triode (P2), PNP triode (P1), the 4th diode (D4), the 5th diode (D5), the 4th comparator (U2A) composition, the base stage of described NPN triode (P2) is connected with the output of described signal conditioning circuit, grounded emitter, the base stage of collector electrode and PNP triode (P1), the tenth resistance (R10) one end is connected, the other end of the tenth resistance (R10) is connected with the negative electrode of the 4th diode (D4), the anode of the 4th diode (D4) is connected with power supply VCC, the emitter of PNP triode (P1) is connected with the 11 resistance (R11) one end, the 11 resistance (R11) other end is connected with power supply VCC, the collector electrode of PNP triode (P1) and the 12 resistance (R12), the second electric capacity (C2), the end of oppisite phase of the 4th comparator (U2A) is connected, the 12 resistance (R12), the other end of the second electric capacity (C2) is connected to the ground, the in-phase end of the 4th comparator (U2A) and the output of described reference voltage circuit, the 5th diode (D5) anode is connected, the 5th diode (D5) negative electrode is connected with power supply VCC, the output of the 4th comparator (U2A) is connected with one end of the 13 resistance (R13), the other end of the 13 resistance (R13) is connected with power supply+5V, this discharges and recharges the output output signal NOPHASE of comparison output circuit through the 4th comparator (U2A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420127319.6U CN203722211U (en) | 2014-03-20 | 2014-03-20 | Phase break protection device used for railway vehicle emergency inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420127319.6U CN203722211U (en) | 2014-03-20 | 2014-03-20 | Phase break protection device used for railway vehicle emergency inverter |
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| Publication Number | Publication Date |
|---|---|
| CN203722211U true CN203722211U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420127319.6U Expired - Fee Related CN203722211U (en) | 2014-03-20 | 2014-03-20 | Phase break protection device used for railway vehicle emergency inverter |
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| Country | Link |
|---|---|
| CN (1) | CN203722211U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360173A (en) * | 2014-08-12 | 2015-02-18 | 东莞市润星机械科技有限公司 | Phase sequence detection method for three-phase alternating currents |
| CN107979065A (en) * | 2017-12-29 | 2018-05-01 | 深圳市汇业达通讯技术有限公司 | A kind of open-phase protection circuit and its control method |
-
2014
- 2014-03-20 CN CN201420127319.6U patent/CN203722211U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360173A (en) * | 2014-08-12 | 2015-02-18 | 东莞市润星机械科技有限公司 | Phase sequence detection method for three-phase alternating currents |
| CN107979065A (en) * | 2017-12-29 | 2018-05-01 | 深圳市汇业达通讯技术有限公司 | A kind of open-phase protection circuit and its control method |
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