CN213521277U - DC/DC module power input overvoltage and overcurrent protection circuit - Google Patents
DC/DC module power input overvoltage and overcurrent protection circuit Download PDFInfo
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- CN213521277U CN213521277U CN202021448879.3U CN202021448879U CN213521277U CN 213521277 U CN213521277 U CN 213521277U CN 202021448879 U CN202021448879 U CN 202021448879U CN 213521277 U CN213521277 U CN 213521277U
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Abstract
The utility model discloses a DC/DC module power input overvoltage, overcurrent protection circuit, including resistance (R1, R2, R3, R4), n channel field effect unit Q1, NPN type triode Q2, zener diode D1, TL431 steady voltage source U1 positive pole, DC/DC module power negative pole is connected to n channel field effect unit Q1, and the node that resistance R3, resistance R2 connect is connected DC/DC module power positive pole; the utility model discloses excessive pressure, overcurrent protection circuit prevent high voltage, electric current to the impact and the damage of back level DC/DC module power through the mating reaction between each electron device, are applicable to all suitable voltage range's input voltage electric current's protection.
Description
Technical Field
The utility model belongs to load protection circuit field, concretely relates to DC/DC module power input excessive pressure, overcurrent protection circuit.
Background
In terms of the current DC/DC module power supply application circuit, most of the DC/DC module power supply application circuits do not have a protection function for the condition of input voltage and current, and few DC/DC module power supply application circuits possibly have protection which is not comprehensive enough.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a DC/DC module power input excessive pressure, overcurrent protection circuit can prevent impact and damage of high voltage, electric current to back level DC/DC module power.
The utility model adopts the technical scheme that the overvoltage and overcurrent protection circuit for the power input of the DC/DC module comprises a resistor R1 with one end connected with the negative electrode input end of a DC plug, the other end of the resistor R1 is connected with the source electrode of an n-channel field effect unit Q1, the negative electrode input end of the DC plug is also connected with the emitter electrode of an NPN type triode Q2, the base electrode of the NPN type triode Q2 is respectively connected with the anode of a voltage stabilizing diode D1, the anode of a TL voltage stabilizing source U1, one end of a resistor R4 and the source electrode of an n-channel field effect unit Q1, the collector electrode of the NPN type triode Q2 is respectively connected with the cathode of a voltage stabilizing diode D1, the cathode of a TL431 voltage stabilizing source U1, the grid electrode of the n-channel field effect unit Q1, one end of a resistor R2, the other end of the resistor R4 and the reference electrode of the TL431 voltage stabilizing source U1 are both connected with a resistor R3, the other end, the positive input end of the direct current plug is connected with the positive electrode of the DC/DC module power supply at the node of the other end of the connecting resistor R3 and the other end of the resistor R2.
The utility model discloses a characteristics still lie in:
the n-channel field effect unit Q1 comprises an n-channel field effect transistor, a voltage stabilizing diode is connected between the drain electrode and the source electrode of the n-channel field effect transistor, the port of the voltage stabilizing diode close to the drain electrode is a cathode, the source electrode of the n-channel field effect transistor is connected with the resistor R1, the drain electrode of the n-channel field effect transistor is connected with the negative electrode of the DC/DC module power supply, and the grid electrode of the n-channel field effect transistor is connected with the base electrode of the NPN type.
The utility model has the advantages that:
the utility model relates to a DC/DC module power input excessive pressure, overcurrent protection circuit through the mating reaction between each electron device, prevents high voltage, electric current to the impact and the damage of back level DC/DC module power, is applicable to all suitable voltage range's input voltage electric current's protection.
Drawings
Fig. 1 is the utility model relates to a DC/DC module power input overvoltage, overcurrent protection circuit structure sketch map.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a DC/DC module power input overvoltage, overcurrent protection circuit, as shown in figure 1, including resistance R1 that one end connects DC plug negative input end, the source electrode of n channel field effect unit Q1 is connected to the resistance R1 other end, the emitter of NPN type triode Q2 is still connected to DC plug negative input end, zener diode D1 positive pole is connected respectively to NPN type triode Q2's base, TL431 steady voltage source U1 positive pole, resistance R4 one end, the source electrode of n channel field effect unit Q1, zener diode D1 negative pole is connected respectively to NPN type triode Q2 collecting electrode, TL431 steady voltage source U1 negative pole, the grid of n channel field effect unit Q1, resistance R2 one end, the resistance R4 other end, TL steady voltage source U1 reference pole all connects resistance R3, the resistance R3 other end, the direct current plug positive input end is connected to the resistance R2 other end, the drain electrode of n channel field effect unit Q1 connects DC/DC module power negative pole, the positive input end of the direct current plug is connected with the positive electrode of the DC/DC module power supply at the node of the other end of the connecting resistor R3 and the other end of the resistor R2.
The n-channel field effect unit Q1 comprises an n-channel field effect transistor, a voltage stabilizing diode is connected between the drain electrode and the source electrode of the n-channel field effect transistor, the port of the voltage stabilizing diode close to the drain electrode is a cathode, the source electrode of the n-channel field effect transistor is connected with the resistor R1, the drain electrode of the n-channel field effect transistor is connected with the negative electrode of the DC/DC module power supply, and the grid electrode of the n-channel field effect transistor is connected with the base electrode of the NPN type.
The utility model relates to a DC/DC module power input excessive pressure, overcurrent protection circuit theory of operation do:
the resistor R3 and the resistor R4 in the circuit have a voltage division function, the voltage R1 can generate certain voltage drop, and the current of the circuit is monitored through the voltage drop, when the normal voltage range is input, the circuit is in a conduction state, namely the n-channel field effect unit Q1 is in an opening state, the NPN type triode Q2 is in a cut-off state, and therefore the input voltage is normally input into the DC/DC module power supply.
When the input voltage rises to the preset protection voltage, the TL431 voltage-stabilizing source U1 is enabled to work and conduct, so that the n-channel field effect unit Q1 stops working and the path of the input voltage is cut off, and the damage of the over-high voltage to a rear-stage circuit is prevented.
When the input current is increased for some reasons, the NPN type triode Q2 is triggered to act when the input current reaches a preset value, so that the n-channel field effect unit Q1 is switched off to prevent the impact and damage of the large input current to the power supply of the rear-stage DC/DC module.
In this way, the utility model relates to a DC/DC module power input excessive pressure, overcurrent protection circuit through the mating reaction between each electron device, prevents high voltage, electric current to the impact and the damage of back level DC/DC module power, is applicable to all suitable voltage range's input voltage electric current's protection.
Claims (2)
1. A DC/DC module power supply input overvoltage and overcurrent protection circuit is characterized by comprising a resistor R1 with one end connected with a negative electrode input end of a direct current plug, the other end of the resistor R1 is connected with a source electrode of an n-channel field effect unit Q1, the negative electrode input end of the direct current plug is also connected with an emitter electrode of an NPN type triode Q2, a base electrode of the NPN type triode Q2 is respectively connected with an anode of a voltage stabilizing diode D1, an anode of a TL431 voltage stabilizing source U1, one end of a resistor R4 and a source electrode of an n-channel field effect unit Q1, a collector electrode of the NPN type triode Q2 is respectively connected with a cathode of a voltage stabilizing diode D1, a cathode of a TL431 voltage stabilizing source U1, a grid electrode of the n-channel field effect unit Q1 and one end of a resistor R2, reference electrodes of the other ends of the resistors R4 and the TL431 voltage stabilizing source U1 are respectively connected with a resistor R3, the other end of the resistor R3 and the, and the positive input end of the direct current plug is connected with the positive electrode of the DC/DC module power supply at the node of the other end of the connecting resistor R3 and the other end of the resistor R2.
2. The DC/DC module power input overvoltage and overcurrent protection circuit as claimed in claim 1, wherein the n-channel FET Q1 includes an n-channel FET, a Zener diode is connected between the drain and the source of the n-channel FET, the terminal of the Zener diode near the drain is a cathode, the source of the n-channel FET is connected with a resistor R1, the drain of the n-channel FET is connected with the negative pole of the DC/DC module power supply, and the gate of the n-channel FET is connected with the base of an NPN triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021448879.3U CN213521277U (en) | 2020-07-21 | 2020-07-21 | DC/DC module power input overvoltage and overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021448879.3U CN213521277U (en) | 2020-07-21 | 2020-07-21 | DC/DC module power input overvoltage and overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213521277U true CN213521277U (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021448879.3U Active CN213521277U (en) | 2020-07-21 | 2020-07-21 | DC/DC module power input overvoltage and overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213521277U (en) |
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2020
- 2020-07-21 CN CN202021448879.3U patent/CN213521277U/en active Active
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