CN219181192U - Power supply overvoltage suppression circuit - Google Patents
Power supply overvoltage suppression circuit Download PDFInfo
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- CN219181192U CN219181192U CN202223116209.3U CN202223116209U CN219181192U CN 219181192 U CN219181192 U CN 219181192U CN 202223116209 U CN202223116209 U CN 202223116209U CN 219181192 U CN219181192 U CN 219181192U
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Abstract
The utility model discloses a power supply overvoltage suppression circuit, which relates to the field of double-flow trains, and comprises: the train power supply module is used for supplying power to the train through an alternating current system and a direct current system, and the alternating current system is provided with two power supply ports; the sampling detection module is used for sampling the power supply voltages of the alternating current system and the direct current system to obtain alternating current sampling voltage and direct current sampling voltage, and when the two sampling voltages exceed a threshold value, the abnormal triggering module is controlled to work; the abnormal trigger module is used for supplying power to the PWM driving module; compared with the prior art, the utility model has the beneficial effects that: when the alternating current power supply system and the direct current power supply system are abnormal, the abnormal triggering module works, and the other power supply port of the alternating current power supply system is controlled to supply alternating current through the PWM driving module and the PWM generating module, and the alternating current is influenced by the sampling of the sampling detection module, so that the train operation system is prevented from being damaged due to overlarge supply voltage.
Description
Technical Field
The utility model relates to the field of double-flow trains, in particular to a power supply overvoltage suppression circuit.
Background
The double-flow train is a train which is provided with two power supply systems of alternating current and direct current and can be switched to operate on two power supply routes of 25KV alternating current and 1500V direct current in a full-automatic mode.
Because the voltage is overlarge, when the power supply voltage is abnormal, the train is always ensured to still normally run by switching another power supply voltage, and the abnormal power supply condition is checked and processed after the running is finished, so that the voltage condition needs to be detected in time, and the abnormal voltage is restrained from being output continuously.
However, two power supplies are still in an oversized condition at the same time, and if voltage output can be restrained, power can be supplied to the train, and train operation can still be ensured.
Disclosure of Invention
The present utility model is directed to a power supply overvoltage suppression circuit, which solves the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a power supply overvoltage suppression circuit, comprising:
the train power supply module is used for supplying power to the train through an alternating current system and a direct current system, and the alternating current system is provided with two power supply ports;
the sampling detection module is used for sampling the power supply voltages of the alternating current system and the direct current system to obtain alternating current sampling voltage and direct current sampling voltage, and when the two sampling voltages exceed a threshold value, the abnormal triggering module is controlled to work;
the abnormal trigger module is used for supplying power to the PWM driving module;
the PWM driving module is used for obtaining inversely proportional driving voltage according to the sampled alternating voltage;
the PWM generation module is used for generating PWM signals according to the driving voltage and controlling the train power supply module to supply power;
the train power supply module is connected with the sampling detection module, the sampling detection module is connected with the abnormal triggering module, the abnormal triggering module is connected with the PWM driving module, the PWM driving module is connected with the PWM generating module, and the PWM generating module is connected with the train power supply module.
As still further aspects of the utility model: the sampling detection module comprises a transformer X1, a diode D1, a capacitor C1, a potentiometer RP1, a diode D3, a transformer X2, a diode D2, a capacitor C2, a potentiometer RP2 and a diode D4, wherein one end of the transformer X1 is connected with the positive electrode of the diode D1, the other end of the transformer X1 is grounded, the negative electrode of the diode D1 is connected with one end of the capacitor C1, one end of the potentiometer RP1 and the PWM driving module, the other end of the capacitor C1 is grounded, the other end of the potentiometer RP1 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the abnormal triggering module, one end of the transformer X2 is connected with the positive electrode of the diode D2, the other end of the transformer X2 is grounded, one end of the diode D2 is connected with one end of the potentiometer RP2, the other end of the capacitor C2 is grounded, the other end of the potentiometer RP2 is connected with the negative electrode of the diode D4, and the positive electrode of the diode D4 is connected with the abnormal triggering module.
As still further aspects of the utility model: the abnormal triggering module comprises an AND gate U1 and an MOS tube V2, wherein the input end of the AND gate U1 is connected with the sampling detection module, the output end of the AND gate U1 is connected with the G pole of the MOS tube V2, the D pole of the MOS tube V2 is connected with the direct-current voltage VCC, and the S pole of the MOS tube V2 is connected with the PWM driving module.
As still further aspects of the utility model: the PWM driving module comprises a resistor R1, an MOS tube V1, a controllable precise voltage stabilizing source TL, a capacitor C3, a resistor R2 and a potentiometer RP3, wherein the D electrode of the MOS tube V1 is connected with one end of the resistor R1 and an abnormal triggering module, the G electrode of the MOS tube V1 is connected with the other end of the resistor R1 and the negative electrode of the controllable precise voltage stabilizing source TL, the S electrode of the MOS tube V1 is connected with the PWM generating module, the positive electrode of the controllable precise voltage stabilizing source TL is grounded, the reference electrode of the controllable precise voltage stabilizing source TL is connected with one end of the capacitor C3, one end of the resistor R2 and one end of the potentiometer RP3, the other end of the capacitor C3 is grounded, the other end of the resistor R2 is grounded, and the other end of the potentiometer RP3 is connected with the sampling detection module.
As still further aspects of the utility model: the PWM generation module comprises a resistor R3, a resistor R4, a resistor R5, a capacitor C4 and an amplifier U2, wherein one end of the resistor R3 is grounded, the other end of the resistor R3 is connected with one end of the resistor R4 and the same-phase end of the amplifier U2, the other end of the resistor R4 is connected with the output end of the amplifier U2, one end of the resistor R5 and the train power supply module, the other end of the resistor R5 is connected with one end of the capacitor C4 and the opposite-phase end of the amplifier U2, and the other end of the capacitor C4 is grounded.
Compared with the prior art, the utility model has the beneficial effects that: when the alternating current power supply system and the direct current power supply system are abnormal, the abnormal triggering module works, and the other power supply port of the alternating current power supply system is controlled to supply alternating current through the PWM driving module and the PWM generating module, and the alternating current is influenced by the sampling of the sampling detection module, so that the train operation system is prevented from being damaged due to overlarge supply voltage.
Drawings
Fig. 1 is a schematic diagram of a supply overvoltage suppression circuit.
Fig. 2 is a first circuit diagram of a supply overvoltage suppression circuit.
Fig. 3 is a second circuit diagram of a supply overvoltage suppression circuit.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, a power supply overvoltage suppression circuit includes:
the train power supply module is used for supplying power to the train through an alternating current system and a direct current system, and the alternating current system is provided with two power supply ports;
the sampling detection module is used for sampling the power supply voltages of the alternating current system and the direct current system to obtain alternating current sampling voltage and direct current sampling voltage, and when the two sampling voltages exceed a threshold value, the abnormal triggering module is controlled to work;
the abnormal trigger module is used for supplying power to the PWM driving module;
the PWM driving module is used for obtaining inversely proportional driving voltage according to the sampled alternating voltage;
the PWM generation module is used for generating PWM signals according to the driving voltage and controlling the train power supply module to supply power;
the train power supply module is connected with the sampling detection module, the sampling detection module is connected with the abnormal triggering module, the abnormal triggering module is connected with the PWM driving module, the PWM driving module is connected with the PWM generating module, and the PWM generating module is connected with the train power supply module.
In this embodiment: referring to fig. 2, the sampling detection module includes a transformer X1, a diode D1, a capacitor C1, a potentiometer RP1, a diode D3, a transformer X2, a diode D2, a capacitor C2, a potentiometer RP2, and a diode D4, wherein one end of the transformer X1 is connected to the positive electrode of the diode D1, the other end of the transformer X1 is grounded, the negative electrode of the diode D1 is connected to one end of the capacitor C1, one end of the potentiometer RP1, the PWM driving module, the other end of the capacitor C1 is grounded, the other end of the potentiometer RP1 is connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is connected to the abnormal triggering module, one end of the transformer X2 is connected to the positive electrode of the diode D2, the other end of the transformer X2 is grounded, the negative electrode of the diode D2 is connected to one end of the capacitor C2, one end of the potentiometer RP2 is grounded, the other end of the capacitor C2 is connected to the negative electrode of the diode D4, and the positive electrode of the diode D4 is connected to the abnormal triggering module.
Under normal conditions, the train power supply module is powered by the alternating current power supply system, and the alternating current VOUT1 is supplied to the train running system through the switch S1; when the alternating current power supply system is abnormal, the alternating current power supply system is automatically switched to supply power to the direct current power supply system, and the direct current VOUT2 is supplied to the train operation system through a switch S2; when the voltage supply of the alternating current power supply system and the direct current power supply system is abnormal and the voltage supply is large, the other power supply port of the alternating current power supply system supplies alternating current VOUT3 through a controllable silicon Z1, and the alternating current VOUT3 is controlled by PWM signals so as to control the magnitude of the alternating current VOUT 3. Alternating current is selected as a supplementary emergency port because the alternating current transportation loss is small.
The transformer X1 of the alternating current power supply system in the sampling detection module samples the alternating current power, the voltage VCC3 is obtained after rectification by the diode D1 and filtering by the capacitor C1, and if the voltage supply of the alternating current power supply system is overlarge, the voltage stabilizing diode D3 is conducted, and the abnormal triggering module passes through high level; the mutual inductor X2 is used for sampling a direct current power supply system, and the principle is the same as that of an alternating current power supply system.
In this embodiment: referring to fig. 3, the abnormal triggering module includes an and gate U1 and a MOS tube V2, wherein an input end of the and gate U1 is connected to the sampling detection module, an output end of the and gate U1 is connected to a G pole of the MOS tube V2, a D pole of the MOS tube V2 is connected to the dc voltage VCC, and an S pole of the MOS tube V2 is connected to the PWM driving module.
When the voltage supply of the alternating current power supply system and the direct current power supply system is large, the input end of the AND gate U1 is high, the AND gate U1 outputs high level, the MOS tube V2 is triggered to be conducted, and the direct current voltage VCC supplies power to the PWM driving module through the MOS tube V2.
In this embodiment: referring to fig. 3, the PWM driving module includes a resistor R1, a MOS tube V1, a controllable precision voltage stabilizing source TL, a capacitor C3, a resistor R2, and a potentiometer RP3, where the D pole of the MOS tube V1 is connected to one end of the resistor R1, an abnormal trigger module, the G pole of the MOS tube V1 is connected to the other end of the resistor R1, the negative pole of the controllable precision voltage stabilizing source TL, the S pole of the MOS tube V1 is connected to the PWM generating module, the positive pole of the controllable precision voltage stabilizing source TL is grounded, the reference pole of the controllable precision voltage stabilizing source TL is connected to one end of the capacitor C3, one end of the resistor R2, one end of the potentiometer RP3, the other end of the capacitor C3 is grounded, and the other end of the resistor R2 is grounded, and the other end of the potentiometer RP3 is connected to the sampling detection module.
The reference pole voltage and the negative pole voltage of the controllable precise voltage stabilizing source TL (the model can be TL 431) are inversely proportional in a certain voltage range, the reference pole voltage is obtained by dividing an alternating current sampling voltage VCC3 of an alternating current power supply system through a potentiometer RP3 and a resistor R2, the larger the alternating current power supply system voltage is, the larger the alternating current sampling voltage VCC3 is, the larger the controllable precise voltage stabilizing source TL reference pole voltage is, the smaller the negative pole voltage of the controllable precise voltage stabilizing source TL is, the lower the conduction degree of a MOS tube V1 is, the smaller the output voltage VCC4 is, and therefore the magnitude of the output voltage VCC4 is changed according to the magnitude of the alternating current power supply system voltage.
In this embodiment: referring to fig. 3, the pwm generating module includes a resistor R3, a resistor R4, a resistor R5, a capacitor C4, and an amplifier U2, where one end of the resistor R3 is grounded, the other end of the resistor R3 is connected to one end of the resistor R4 and the in-phase end of the amplifier U2, the other end of the resistor R4 is connected to the output end of the amplifier U2, one end of the resistor R5, and the train power supply module, the other end of the resistor R5 is connected to one end of the capacitor C4 and the inverting end of the amplifier U2, and the other end of the capacitor C4 is grounded.
When the voltage of the same-phase end of the amplifier U2 is higher than the voltage of the opposite-phase end, the amplifier U2 outputs a high level (voltage VCC 4), and the capacitor C4 is charged through a resistor R5; when the voltage of the same-phase end of the amplifier U2 is smaller than the voltage of the opposite-phase end, the amplifier U2 outputs a low level, and the capacitor C4 discharges through the resistors R5, R4 and R3; the capacitor C4 forms a PWM signal through charge and discharge, the larger the voltage VCC4 is, the shorter the charging time of the capacitor C4 is, the shorter the time of the capacitor C4 in a low level is, and the smaller the duty ratio of the PWM signal is formed; conversely, the smaller the voltage VCC4, the greater the PWM duty cycle is formed;
therefore, the larger the voltage of the alternating current power supply system is, the smaller the output voltage VCC4 is, the larger the PWM duty ratio is, the shorter the unit conduction time of the control silicon controlled rectifier Z1 is, and the smaller the output alternating current VOUT3 is, so that stable alternating current VOUT3 output is constructed, and the power supply stability is ensured.
The working principle of the utility model is as follows: the train power supply module comprises an alternating current system and a direct current system which are used for supplying power to a train, wherein the alternating current system is provided with two power supply ports; the sampling detection module samples the power supply voltages of the alternating current system and the direct current system to obtain alternating current sampling voltage and direct current sampling voltage, and when the two sampling voltages exceed a threshold value, the abnormal triggering module is controlled to work; the abnormal trigger module is used for supplying power to the PWM driving module; the PWM driving module obtains inversely proportional driving voltage according to the sampled alternating voltage; the PWM generating module generates PWM signals according to the driving voltage to control the train power supply module to supply power.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. A power supply overvoltage suppression circuit, characterized by:
the power supply overvoltage suppression circuit includes:
the train power supply module is used for supplying power to the train through an alternating current system and a direct current system, and the alternating current system is provided with two power supply ports;
the sampling detection module is used for sampling the power supply voltages of the alternating current system and the direct current system to obtain alternating current sampling voltage and direct current sampling voltage, and when the two sampling voltages exceed a threshold value, the abnormal triggering module is controlled to work;
the abnormal trigger module is used for supplying power to the PWM driving module;
the PWM driving module is used for obtaining inversely proportional driving voltage according to the sampled alternating voltage;
the PWM generation module is used for generating PWM signals according to the driving voltage and controlling the train power supply module to supply power;
the train power supply module is connected with the sampling detection module, the sampling detection module is connected with the abnormal triggering module, the abnormal triggering module is connected with the PWM driving module, the PWM driving module is connected with the PWM generating module, and the PWM generating module is connected with the train power supply module;
the sampling detection module comprises a transformer X1, a diode D1, a capacitor C1, a potentiometer RP1, a diode D3, a transformer X2, a diode D2, a capacitor C2, a potentiometer RP2 and a diode D4, wherein one end of the transformer X1 is connected with the positive electrode of the diode D1, the other end of the transformer X1 is grounded, the negative electrode of the diode D1 is connected with one end of the capacitor C1, one end of the potentiometer RP1 and the PWM driving module, the other end of the capacitor C1 is grounded, the other end of the potentiometer RP1 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the abnormal triggering module, one end of the transformer X2 is connected with the positive electrode of the diode D2, the other end of the transformer X2 is grounded, one end of the diode D2 is connected with one end of the potentiometer RP2, the other end of the capacitor C2 is grounded, the other end of the potentiometer RP2 is connected with the negative electrode of the diode D4, and the positive electrode of the diode D4 is connected with the abnormal triggering module;
the abnormal triggering module comprises an AND gate U1 and an MOS tube V2, wherein the input end of the AND gate U1 is connected with the sampling detection module, the output end of the AND gate U1 is connected with the G pole of the MOS tube V2, the D pole of the MOS tube V2 is connected with the direct-current voltage VCC, and the S pole of the MOS tube V2 is connected with the PWM driving module;
the PWM driving module comprises a resistor R1, an MOS tube V1, a controllable precise voltage stabilizing source TL, a capacitor C3, a resistor R2 and a potentiometer RP3, wherein the D electrode of the MOS tube V1 is connected with one end of the resistor R1 and an abnormal triggering module, the G electrode of the MOS tube V1 is connected with the other end of the resistor R1 and the negative electrode of the controllable precise voltage stabilizing source TL, the S electrode of the MOS tube V1 is connected with the PWM generating module, the positive electrode of the controllable precise voltage stabilizing source TL is grounded, the reference electrode of the controllable precise voltage stabilizing source TL is connected with one end of the capacitor C3, one end of the resistor R2 and one end of the potentiometer RP3, the other end of the capacitor C3 is grounded, the other end of the resistor R2 is grounded, and the other end of the potentiometer RP3 is connected with the sampling detection module;
the PWM generation module comprises a resistor R3, a resistor R4, a resistor R5, a capacitor C4 and an amplifier U2, wherein one end of the resistor R3 is grounded, the other end of the resistor R3 is connected with one end of the resistor R4 and the same-phase end of the amplifier U2, the other end of the resistor R4 is connected with the output end of the amplifier U2, one end of the resistor R5 and the train power supply module, the other end of the resistor R5 is connected with one end of the capacitor C4 and the opposite-phase end of the amplifier U2, and the other end of the capacitor C4 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223116209.3U CN219181192U (en) | 2022-11-23 | 2022-11-23 | Power supply overvoltage suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223116209.3U CN219181192U (en) | 2022-11-23 | 2022-11-23 | Power supply overvoltage suppression circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219181192U true CN219181192U (en) | 2023-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223116209.3U Active CN219181192U (en) | 2022-11-23 | 2022-11-23 | Power supply overvoltage suppression circuit |
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|---|---|
| CN (1) | CN219181192U (en) |
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- 2022-11-23 CN CN202223116209.3U patent/CN219181192U/en active Active
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