CN220628911U - Input power supply control circuit of automobile part - Google Patents
Input power supply control circuit of automobile part Download PDFInfo
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- CN220628911U CN220628911U CN202322089636.5U CN202322089636U CN220628911U CN 220628911 U CN220628911 U CN 220628911U CN 202322089636 U CN202322089636 U CN 202322089636U CN 220628911 U CN220628911 U CN 220628911U
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- automobile
- suppression diode
- transient suppression
- schottky
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- 230000001629 suppression Effects 0.000 claims abstract description 21
- 230000001052 transient effect Effects 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 description 3
- 101150045592 RSC1 gene Proteins 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model relates to an input power supply control circuit of an automobile part, which comprises an automobile battery power supply Vbat, a Schottky power rectifier D1, a TVS transient suppression diode D2, four 0 ohm resistors, a patch capacitor C1 and a voltage output end Vpwr; the positive electrode of the Schottky power rectifier D1 and the cathode of the TVS transient suppression diode D2 are connected with the input end of the automobile battery power supply Vbat; one end of the four 0 ohm resistors are connected in parallel and then connected with the negative electrode of the Schottky power rectifier D1, the other end of the four 0 ohm resistors are connected with one end of the patch capacitor C1 and the voltage output end Vpwr, and the other end of the patch capacitor C1 is grounded; the anode of the TVS transient suppression diode D2 is grounded; the utility model solves the problem of high construction cost of constructing peripheral circuits by using the power supply control chip, and realizes the functions required by the power supply of automobile parts by using lower cost.
Description
Technical Field
The utility model relates to an input power supply control circuit of an automobile part.
Background
The power supply used by the automobile parts is provided by an automobile battery, and is about 12V in operation. However, when the automobile is started, the surge voltage may exceed 16V. Such excessive voltage may impact the chip used for the component to cause functional damage of the device, and even cause a safety accident.
In order to prevent the automobile parts from being damaged by the impact of surge voltage, a protection circuit is added in the power supply circuit of the existing automobile parts, for example, chinese patent with the authority of CN 202840463U discloses an automobile instrument power supply protection circuit, which comprises two circuit protection modules, wherein the circuit protection module I comprises a diode D with the anode inputting 12V voltage, a self-recovery fuse RSC1 connected with the cathode of the diode D1, a power resistor R1, a TVS transient noise suppression diode, capacitors C1 and C2 and a switch power supply chip LM2596, and the other end of the self-recovery fuse RSC1 is connected with the power resistor R1 in series; after the TVS transient noise suppression diode and the capacitors C1 and C2 form a parallel circuit, one end of the TVS transient noise suppression diode is connected with the power resistor R1 and the input port of the switching power supply chip LM2596 respectively, and the other end of the TVS transient noise suppression diode is connected with the ground wire; the circuit protection module II comprises a relay for controlling the switching of a power switch of the instrument and a voltage stabilizing tube D3; the circuit protection module I is connected in parallel with the circuit protection module II. However, the power protection circuit is provided with a switch power supply chip, other circuits are required to be built around the power protection circuit, the power protection circuit has relatively high cost, and the power supply of automobile parts does not need such a complicated power protection circuit in many cases.
Disclosure of Invention
In order to solve the technical problems, the utility model provides an input power supply control circuit of an automobile part.
The utility model is realized by the following technical scheme.
The utility model provides an input power supply control circuit of an automobile part, which comprises: the power supply comprises an automobile battery power supply Vbat, a Schottky power rectifier D1, a TVS transient suppression diode D2, four 0 ohm resistors, a patch capacitor C1 and a voltage output end Vpwr; the positive electrode of the Schottky power rectifier D1 and the cathode of the TVS transient suppression diode D2 are connected with the input end of the automobile battery power supply Vbat; one end of the four 0 ohm resistors are connected in parallel and then connected with the negative electrode of the Schottky power rectifier D1, the other end of the four 0 ohm resistors are connected with one end of the patch capacitor C1 and the voltage output end Vpwr, and the other end of the patch capacitor C1 is grounded; the anode of the TVS transient suppression diode D2 is grounded.
The utility model has the beneficial effects that:
1. when the direct current voltage is input by the automobile battery power supply Vbat, a TVS transient suppression diode D2 is reversely connected with the input end of the automobile battery power supply Vbat, when the input direct current voltage reaches the breakdown voltage of D2, D2 is reversely broken down, and the voltage is led to the ground, so that the damage of the surge voltage generated by an automobile to automobile parts is avoided;
2. the accessed Schottky power rectifier D1 has lower forward voltage drop, so that the loss power consumption of the circuit is lower; the anti-current surge impact capability is strong, and the anti-reverse plug and rectifying function is realized on the automobile power supply Vbat;
3. the four 0 ohm resistors are connected in parallel and then connected in series with the diode D1 to be connected into a circuit, when the circuit current is overlarge, the fuse protection circuit is realized, the four resistors are connected in parallel, so that the load current on the resistors is smaller, and the loss is reduced;
4. c1 is a patch capacitor for filtering power supply ripple waves and reducing low-frequency interference.
Therefore, the input power supply control circuit of the utility model uses simple components to realize the circuit function, thereby reducing the design difficulty and cost; the circuit is suitable for most automobile part circuits; when the input voltage is higher than the breakdown voltage of the TVS transient suppression diode D2, the main circuit is not electrified, so that the circuit is effectively protected; the energy loss is small; in addition, according to the voltage of the circuit which needs to be supplied with power, transient suppression diodes with different specifications can be selected to be replaced, and the circuit is adapted.
Drawings
Fig. 1 is a schematic diagram of an input power control circuit according to the present utility model.
Detailed Description
The technical solution of the present utility model is further described below, but the scope of the claimed utility model is not limited to the above.
As shown in fig. 1, an input power control circuit for an automobile part: the power supply comprises an automobile battery power supply Vbat, a Schottky power rectifier D1, a TVS transient suppression diode D2, four 0 ohm resistors R1, R2, R3 and R4, a patch capacitor C1 and a voltage output end Vpwr; the positive electrode of the Schottky power rectifier D1 and the cathode of the TVS transient suppression diode D2 are connected with the input end of the automobile battery power supply Vbat; one end of the four 0 ohm resistors R1, R2, R3 and R4 which are connected in parallel is connected with the cathode of the Schottky power rectifier D1, the other end of the four 0 ohm resistors is connected with one end of the patch capacitor C1 and the voltage output end Vpwr, and the other end of the patch capacitor C1 is grounded; the anode of the TVS transient suppression diode D2 is grounded.
Preferably, the direct-current voltage input by the automobile battery power supply Vbat is 12V;
preferably, the reverse cut-off voltage of the TVS transient suppression diode D2 is 18V, the breakdown voltage is 20V, and the maximum clamping voltage is 29.2V;
preferably, the direct current reverse withstand voltage of the schottky power rectifier D1 is 60V, the average rectifying current is 2A, and the forward voltage drop is 630mv;
preferably, C1 is a patch capacitor with a capacitance of 4.7uF and a power of 50V.
The technical effects realized by the components of each part are as follows:
schottky power rectifier D1: the forward voltage drop is low, so that the loss power consumption of the circuit is low; the unidirectional conductivity of the power supply is utilized to have the functions of anti-insertion and rectification for the automobile power supply Vbat;
TVS transient suppression diode D2: d2 is reversely connected to the Vbat position, when the voltage reaches 20V, the D2 is reversely broken down, and the voltage is led to the ground, so that the damage of surge voltage generated by an automobile to automobile parts is avoided;
0 ohm resistors R1, R2, R3 and R4: the four 0 ohm resistors R1, R2, R3 and R4 are connected in parallel and then connected with the diode D1 in series to be connected into a circuit, when the circuit current is overlarge, the fuse protection circuit is realized, and the four resistors are connected in parallel, so that the load current on the resistor is smaller, and the loss is reduced;
patch capacitance C1: the power supply ripple wave can be filtered, and low-frequency interference is reduced.
Claims (1)
1. An input power supply control circuit of an automobile part is characterized in that: the power supply comprises an automobile battery power supply Vbat, a Schottky power rectifier D1, a TVS transient suppression diode D2, four 0 ohm resistors, a patch capacitor C1 and a voltage output end Vpwr; the positive electrode of the Schottky power rectifier D1 and the cathode of the TVS transient suppression diode D2 are connected with the input end of the automobile battery power supply Vbat; one end of the four 0 ohm resistors are connected in parallel and then connected with the negative electrode of the Schottky power rectifier D1, the other end of the four 0 ohm resistors are connected with one end of the patch capacitor C1 and the voltage output end Vpwr, and the other end of the patch capacitor C1 is grounded; the anode of the TVS transient suppression diode D2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322089636.5U CN220628911U (en) | 2023-08-04 | 2023-08-04 | Input power supply control circuit of automobile part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322089636.5U CN220628911U (en) | 2023-08-04 | 2023-08-04 | Input power supply control circuit of automobile part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628911U true CN220628911U (en) | 2024-03-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322089636.5U Active CN220628911U (en) | 2023-08-04 | 2023-08-04 | Input power supply control circuit of automobile part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628911U (en) |
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2023
- 2023-08-04 CN CN202322089636.5U patent/CN220628911U/en active Active
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