CN216794666U - Passenger train is used for preventing charger output overvoltage's protection device - Google Patents
Passenger train is used for preventing charger output overvoltage's protection device Download PDFInfo
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- CN216794666U CN216794666U CN202123185210.7U CN202123185210U CN216794666U CN 216794666 U CN216794666 U CN 216794666U CN 202123185210 U CN202123185210 U CN 202123185210U CN 216794666 U CN216794666 U CN 216794666U
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- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000012423 maintenance Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 30
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 11
- 238000009434 installation Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of power distribution, in particular to a protection device for preventing a charger from outputting overvoltage for a railway passenger car, which comprises a power supply module, a detection module, a power-off module and a maintenance module, wherein the power supply module is used for supplying power to the charger; the power supply module, the detection module, the power-off module and the maintenance module are sequentially connected; the power supply module is used for supplying power to the detection module, the power-off module and the maintenance module; the detection module is used for detecting the output voltage value of the charger and sending an overvoltage signal to the power-off module when the output voltage value of the charger is greater than a voltage threshold value; the power-off module is used for cutting off a charger control power supply when receiving the overvoltage signal; the maintaining module is used for keeping the power-off module in a state of cutting off the charger control power supply when the power-off module cuts off the charger control power supply, so that the charger can stop working after the overvoltage protection function of the charger per se fails, and the charger is prevented from outputting overvoltage.
Description
Technical Field
The utility model relates to the technical field of power distribution, in particular to a protection device for preventing overvoltage output by a charger of a railway passenger car.
Background
The current general speed passenger car with a DC600V power supply system with the speed per hour of 160km and below adopts the modes of centralized power supply of an electric locomotive and distributed variable current power supply of the passenger car, the passenger car sends a path of 600V direct current voltage rectified and output by the electric locomotive to a DC600V inverter power supply device and a DC600V/DC110V charger, and the DC600V/DC110V charger converts the DC600V direct current into DC110V direct current to charge a storage battery pack and simultaneously supply power to loads such as illumination, power supply control and the like; in order to avoid overhigh output voltage of the charger, the conventional charger consists of a main circuit and a control circuit, the rated input voltage of the main circuit is DC600V, the rated input voltage of the control circuit is DC110V, the output voltage of the charger is sampled and fed back to a XP2/21 pin of a control board by a voltage sensor TV303, the sensor is in current type output, the control board is converted into a voltage signal by a sampling circuit, the sampling signal is transmitted to a control chip by an operational amplification circuit, and the control chip adjusts the output voltage by adjusting the duty ratio of a PWM signal to form closed-loop control; however, when any link of a sensor, a sampling circuit and an amplifying circuit of the charger fails, such as sensor failure, component desoldering, operational amplifier failure and the like, sampling failure of output voltage is caused, the charger enters a free oscillation state, the duty ratio is increased to the maximum value set by software, the output voltage is out of control, and serious risk of burning a rear-end load battery exists; therefore, in order to prevent the charger from outputting overvoltage, which results from the over-high output voltage, due to the failure of the protection function of the charger, it is necessary to design a protection device for preventing the charger from outputting overvoltage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a protection device for preventing the overvoltage output by a charger of a railway passenger car, which can stop the charger after the overvoltage protection function of the charger fails, thereby avoiding the overvoltage output by the charger.
In order to achieve the aim, the utility model provides a protection device for preventing the output overvoltage of a charger of a railway passenger car, which comprises a power supply module, a detection module, a power-off module and a maintaining module, wherein the power supply module is used for supplying power to the detection module; the power supply module, the detection module, the power-off module and the maintenance module are sequentially connected;
the power supply module is used for supplying power to the detection module, the power-off module and the maintenance module;
the detection module is used for detecting the output voltage value of the charger and sending an overvoltage signal to the power-off module when the output voltage value of the charger is greater than a voltage threshold value;
the power-off module is used for cutting off a charger control power supply when receiving the overvoltage signal;
the maintaining module is used for enabling the power-off module to keep a state of cutting off the charger control power supply when the power-off module cuts off the charger control power supply.
The detection module comprises a first electrolytic capacitor, a 555 chip, a light emitting diode, a second capacitor, a first triode, a sixth resistor, a voltage stabilizing diode, a potentiometer and a second resistor;
two ends of the first electrolytic capacitor are respectively connected with the anode and the cathode of the power module; the 555 chip is connected with the first electrolytic capacitor; the anode of the light emitting diode is connected with the power-off module, and the cathode of the light emitting diode is connected with the first electrolytic capacitor; one end of the second capacitor is connected with the 555 chip, and the other end of the second capacitor is connected with the cathode of the light emitting diode; the collector of the first triode is connected with the 555 chip, and the emitter of the first triode is connected with the second capacitor; one end of the sixth resistor is connected with the second capacitor, and the other end of the sixth resistor is connected with the base electrode of the first triode; the anode of the voltage stabilizing diode is connected with the sixth resistor; one end of the potentiometer is connected with the cathode of the voltage stabilizing diode, and one end of the second resistor is connected with the other end of the potentiometer.
The power-off module comprises a first resistor, a third resistor, a fourth resistor, a third triode and a relay;
one end of the first resistor is connected with the anode of the light emitting diode, and the other end of the first resistor is connected with the 555 chip; one end of the third resistor is connected with the 555 chip; one end of the fourth resistor is connected with one end of the third resistor, which is far away from the 555 chip; the emitter and the base of the third triode are respectively connected with two ends of the fourth resistor; the positive pole of the input end of the relay is connected with the collector of the third triode, and the negative pole of the input end of the relay is connected with the sixth resistor.
The maintaining module comprises a second triode, a fifth resistor, a seventh resistor and a ninth resistor;
the emitter of the second triode is connected with the 555 chip; one end of the fifth resistor is connected with the collector of the first triode, and the other end of the fifth resistor is connected with the base of the second triode; one end of the seventh resistor is connected with the base electrode of the second triode, and the other end of the seventh resistor is connected with the 555 chip; one end of the ninth resistor is connected with the collector of the second triode, and the other end of the ninth resistor is connected with the base of the first triode.
The utility model provides a protection device for preventing overvoltage output by a charger of a railway passenger car, which is powered by a train DC110V bus and supplies power to a detection module, a power-off module and a maintenance module through a power module; the detection module is used for detecting the output voltage value of the charger, when the output voltage value of the charger is larger than a voltage threshold value, wherein the voltage threshold value is a preset overvoltage protection value, an overvoltage signal is sent to the power-off module, and when the power-off module receives the overvoltage signal, the charger control power supply is cut off, and the charger stops working, so that the overvoltage protection effect is achieved; when the power-off module cuts off the charger control power supply, the maintaining module enables the power-off module to keep the state of cutting off the charger control power supply, so that the charger can keep the state of stopping working, the protection state can be continuously maintained, the power supply to the power supply module can be restored only by manually cutting off the power supply, and the overvoltage protection effect can be further improved; in conclusion, the charger can stop working after the overvoltage protection function of the charger per se fails, so that the charger is prevented from outputting overvoltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a protection device for preventing the output of a charger from being over-voltage for a railway passenger car.
Fig. 2 is a schematic structural view of a first installation method of the present invention.
FIG. 3 is a schematic structural view of a second embodiment of the present invention.
FIG. 4 is a schematic structural view of a third embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a protection device for preventing the output of a charger from being over-voltage for a railway passenger car.
The power supply comprises a power supply module 1, a detection module 2, a power-off module 3, a maintenance module 4, a first electrolytic capacitor C1, an LED-light emitting diode, a second capacitor C2, a first VT1, a first triode, a sixth resistor R6, a voltage-stabilizing diode VS, an RP-potentiometer, a second resistor R2, a chip U555, a first resistor R1, a third resistor R3, a fourth resistor R4, a third triode VT3, a KA-relay, a second triode VT2, a fifth resistor R5, a seventh resistor R7 and a ninth resistor R9.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 5, the present invention provides a protection device for preventing an output overvoltage of a charger of a railway passenger car: the device comprises a power supply module 1, a detection module 2, a power-off module 3 and a maintenance module 4; the power module 1, the detection module 2, the power-off module 3 and the maintenance module 4 are connected in sequence;
the power supply module 1 is used for supplying power to the detection module 2, the power-off module 3 and the maintenance module 4;
the detection module 2 is used for detecting the output voltage value of the charger, and sending an overvoltage signal to the power-off module 3 when the output voltage value of the charger is greater than a voltage threshold value;
the power-off module 3 is used for cutting off a charger control power supply when receiving the overvoltage signal;
the maintaining module 4 is configured to maintain the power-off module 3 in a state of cutting off the charger control power supply when the power-off module 3 cuts off the charger control power supply.
In the embodiment, the utility model provides a protection device for preventing the output overvoltage of a charger of a railway passenger car, which is powered by a DC110V bus of the train, and the power module 1 is used for supplying power to the detection module 2, the power-off module 3 and the maintenance module 4; the detection module 2 is used for detecting the output voltage value of the charger, when the output voltage value of the charger is greater than a voltage threshold value, wherein the voltage threshold value is a preset overvoltage protection value, an overvoltage signal is sent to the power-off module 3, and when the power-off module 3 receives the overvoltage signal, the charger control power supply is cut off, and the charger stops working, so that the overvoltage protection effect is achieved; when the power-off module 3 cuts off the charger control power supply, the maintaining module 4 enables the power-off module 3 to keep the state of cutting off the charger control power supply, so that the charger can keep the state of stopping working, the protection state can be continuously maintained, the power supply to the power supply module 1 can be restored only by manually cutting off the power supply, and the overvoltage protection effect can be further improved.
The utility model provides a protection device for preventing the output overvoltage of a charger of a railway passenger car, which can adopt the following three additional installation modes.
The first installation mode is as follows: the charger is arranged on a guide rail in a comprehensive control cabinet on a passenger car, the charger is not required to be modified, and the scheme of adding the charger is shown in an attached figure 2; the DC110V of the charger controls the power supply to supply power through the breaker Q36 of the bus integrated control cabinet, and when the utility model detects the output overvoltage of the charger, the power supply is controlled by cutting off the input DC110V of the charger, thereby achieving the effect of stopping the output of the charger.
And (2) adding a second method: installing in a charger, and referring to figure 3; according to the scheme, the power supply of the power panel in the charger is cut off, the control panel is a control center for the work of the charger, when the overvoltage protection device detects that the charger outputs overvoltage, the power panel is cut off to supply power to the control panel, the charger stops working, and therefore the effect that the charger stops outputting is achieved.
The additional installation mode is three: installing in a charger, and referring to figure 4; the main circuit of the charger mainly comprises a fuse, an EMI filter, a contactor, a supporting electrolytic capacitor, an IGBT, a high-frequency transformer and a rectifier diode; according to the scheme, the voltage of the coil of the contactor in the charger is cut off, the contactor is disconnected to cut off the main loop power supply of the charger, and therefore the effect that the charger stops outputting is achieved.
In conclusion, the charger can stop working after the overvoltage protection function of the charger per se fails, so that the charger is prevented from outputting overvoltage.
Further, the detection module 2 includes a first electrolytic capacitor C1, a 555 chip U, a light emitting diode LED, a second capacitor C2, a first triode VT1, a sixth resistor R6, a voltage regulator diode VS, a potentiometer RP, and a second resistor R2;
two ends of the first electrolytic capacitor C1 are respectively connected with the positive electrode and the negative electrode of the power module 1; the 555 chip U is connected with the first electrolytic capacitor C1; the anode of the light emitting diode LED is connected with the power-off module 3, and the cathode of the light emitting diode LED is connected with the first electrolytic capacitor C1; one end of the second capacitor C2 is connected with the 555 chip U, and the other end of the second capacitor C2 is connected with the cathode of the LED; the collector of the first triode VT1 is connected with the 555 chip U, and the emitter of the first triode VT1 is connected with the second capacitor C2; one end of the sixth resistor R6 is connected with the second capacitor C2, and the other end of the sixth resistor R6 is connected with the base of the first triode VT 1; the positive electrode of the voltage stabilizing diode VS is connected with the sixth resistor R6; one end of the potentiometer RP is connected with the negative electrode of the voltage stabilizing diode VS, and one end of the second resistor R2 is connected with the other end of the potentiometer RP.
In this embodiment, when detecting that the output voltage of the charger is higher than the set voltage threshold, the first triode VT1 is turned on to send an overvoltage signal to the 555 chip U, and when the 555 chip U receives the overvoltage signal, the charger control power supply is cut off, and the charger stops working, thereby achieving the effect of overvoltage protection.
Further, the power-off module 3 comprises a first resistor R1, a third resistor R3, a fourth resistor R4, a third transistor VT3 and a relay KA;
one end of the first resistor R1 is connected with the anode of the LED, and the other end of the first resistor R1 is connected with the 555 chip U; one end of the third resistor R3 is connected with the 555 chip U; one end of the fourth resistor R4 is connected with one end of the third resistor R3, which is far away from the 555 chip U; an emitter and a base of the third triode VT3 are respectively connected with two ends of the fourth resistor R4; the positive pole of relay KA input end with the third triode VT3 collecting electrode is connected, the relay KA input end negative pole with the sixth resistance R6 is connected.
In this embodiment, the 555 chip U receives an overvoltage signal to control the third transistor VT3 to be turned off, and the relay KA is turned off, so as to cut off the charger DC110V to control the power supply, and the charger stops working, thereby achieving the overvoltage protection effect.
Further, the maintaining module 4 includes a second transistor VT2, a fifth resistor R5, a seventh resistor R7, and a ninth resistor R9;
the emitter of the second triode VT2 is connected with the 555 chip U; one end of the fifth resistor R5 is connected with the collector of the first triode VT1, and the other end is connected with the base of the second triode VT 2; one end of the seventh resistor R7 is connected with the base electrode of the second triode VT2, and the other end of the seventh resistor R7 is connected with the 555 chip U; one end of the ninth resistor R9 is connected with the collector of the second triode VT2, and the other end is connected with the base of the first triode VT 1.
In this embodiment, when the relay KA is turned off to cut off the control power of the charger DC110V, the second transistor VT2 is also turned on at the same time, so that the third transistor VT3 can be ensured to maintain the off state, and the relay KA is continuously turned off to maintain the protection state.
The utility model provides a protective device for preventing a charger from outputting overvoltage for a railway passenger car, wherein a train DC110V bus supplies power, the power is supplied to a 555 chip U through a power module 1, and when the output voltage of the charger is normal, a third triode VT3 controls a relay KA to be conducted; when the output voltage of the charger is detected to be higher than a set voltage threshold, the first triode VT1 is conducted, the 555 chip U receives an overvoltage signal to control the third triode VT3 to be cut off, the relay KA is disconnected, the charger DC110V is cut off to control the power supply, and the charger stops working, so that the overvoltage protection effect is achieved; when the relay KA is switched off and the control power supply of the charger DC110V is cut off, the second triode VT2 is also switched on at the same time, so that the third triode VT3 can be ensured to maintain a cut-off state, the relay KA is continuously cut off, and a protection state is maintained, so that once the charger has an output overvoltage fault, the protection state can be continuously maintained, the power supply to the power module 1 can be restored only by manually switching off, and the overvoltage protection effect can be further improved; through the mode, the charger can stop working after the overvoltage protection function of the charger fails, so that the output overvoltage of the charger is avoided.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.
Claims (4)
1. A protection device for preventing the output overvoltage of a charger of a railway passenger car is characterized in that,
the device comprises a power supply module, a detection module, a power-off module and a maintenance module; the power supply module, the detection module, the power-off module and the maintenance module are sequentially connected;
the power supply module is used for supplying power to the detection module, the power-off module and the maintenance module;
the detection module is used for detecting the output voltage value of the charger and sending an overvoltage signal to the power-off module when the output voltage value of the charger is greater than a voltage threshold value;
the power-off module is used for cutting off a charger control power supply when receiving the overvoltage signal;
the maintaining module is used for enabling the power-off module to keep a state of cutting off the charger control power supply when the power-off module cuts off the charger control power supply.
2. A protection device for preventing overvoltage of charger output of railway carriage as claimed in claim 1,
the detection module comprises a first electrolytic capacitor, a 555 chip, a light emitting diode, a second capacitor, a first triode, a sixth resistor, a voltage stabilizing diode, a potentiometer and a second resistor;
two ends of the first electrolytic capacitor are respectively connected with the anode and the cathode of the power module; the 555 chip is connected with the first electrolytic capacitor; the anode of the light emitting diode is connected with the power-off module, and the cathode of the light emitting diode is connected with the first electrolytic capacitor; one end of the second capacitor is connected with the 555 chip, and the other end of the second capacitor is connected with the cathode of the light emitting diode; the collector of the first triode is connected with the 555 chip, and the emitter of the first triode is connected with the second capacitor; one end of the sixth resistor is connected with the second capacitor, and the other end of the sixth resistor is connected with the base electrode of the first triode; the anode of the voltage stabilizing diode is connected with the sixth resistor; one end of the potentiometer is connected with the cathode of the voltage stabilizing diode, and one end of the second resistor is connected with the other end of the potentiometer.
3. A protection device for preventing overvoltage of charger output of railway carriage as claimed in claim 2,
the power-off module comprises a first resistor, a third resistor, a fourth resistor, a third triode and a relay;
one end of the first resistor is connected with the anode of the light emitting diode, and the other end of the first resistor is connected with the 555 chip; one end of the third resistor is connected with the 555 chip; one end of the fourth resistor is connected with one end of the third resistor; the emitter and the base of the third triode are respectively connected with two ends of the fourth resistor; the positive pole of the input end of the relay is connected with the collector of the third triode, and the negative pole of the input end of the relay is connected with the sixth resistor.
4. A protection device for preventing overvoltage of charger output of railway carriage as claimed in claim 3,
the maintaining module comprises a second triode, a fifth resistor, a seventh resistor and a ninth resistor;
the emitter of the second triode is connected with the 555 chip; one end of the fifth resistor is connected with the collector of the first triode, and the other end of the fifth resistor is connected with the base of the second triode; one end of the seventh resistor is connected with the base electrode of the second triode, and the other end of the seventh resistor is connected with the 555 chip; one end of the ninth resistor is connected with the collector of the second triode, and the other end of the ninth resistor is connected with the base of the first triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123185210.7U CN216794666U (en) | 2021-12-17 | 2021-12-17 | Passenger train is used for preventing charger output overvoltage's protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123185210.7U CN216794666U (en) | 2021-12-17 | 2021-12-17 | Passenger train is used for preventing charger output overvoltage's protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216794666U true CN216794666U (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123185210.7U Expired - Fee Related CN216794666U (en) | 2021-12-17 | 2021-12-17 | Passenger train is used for preventing charger output overvoltage's protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216794666U (en) |
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2021
- 2021-12-17 CN CN202123185210.7U patent/CN216794666U/en not_active Expired - Fee Related
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