CN219394430U

CN219394430U - Low-power-consumption reverse connection preventing circuit of vehicle-mounted redundant power supply

Info

Publication number: CN219394430U
Application number: CN202223571645.XU
Authority: CN
Inventors: 刘洪宇; 王慧娟
Original assignee: Zhengzhou Tiamaes Technology Co ltd
Current assignee: Zhengzhou Tiamaes Technology Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-07-21
Anticipated expiration: 2032-12-31

Abstract

The utility model provides a low-power-consumption reverse connection prevention circuit of a vehicle-mounted redundant power supply, which comprises a main input power supply and a standby power supply, wherein the main input power supply and the standby power supply are grounded through TVS (transient voltage suppressor) respectively, the main input power supply and the standby power supply are connected with source electrodes of corresponding rectifying MOS (metal oxide semiconductor) tubes respectively, and drain electrodes of the MOS tubes are connected with output voltage ends; the control chip controls the gate voltage of the main input power supply MOS tube or the standby power supply MOS tube to be turned on or turns off the corresponding MOS tube through the charge pump; the output voltage end is connected with the back-end load. The utility model controls the external MOS to work as an ideal rectifying diode through the HMOS OR-ing controller. The OR-ing controller allows the MOS transistors to replace schottky diodes in the distribution network, thereby reducing power loss and voltage drop. The controller provides charge pump gate drive for external MOS, and provides a fast response comparator to close the MOS tube when current is reversed, so as to realize reverse connection prevention function.

Description

Low-power-consumption reverse connection preventing circuit of vehicle-mounted redundant power supply

Technical Field

The utility model belongs to the technical field of vehicle-mounted power supply protection circuits, and particularly relates to a low-power-consumption reverse connection prevention circuit of a vehicle-mounted redundant power supply.

Background

Due to the complexity of the vehicle-mounted power supply environment, the requirement on the power supply stability of the vehicle-mounted electronic product is extremely high. Systems that generally require high availability often use multiple redundant power supplies connected in parallel to increase reliability. Schottky OR-ing diodes are commonly used to connect these redundant power supplies to a common load terminal without affecting the overall system when one power supply fails. The disadvantage of using an OR-ing diode is that the forward voltage drop reduces the available voltage and increases the associated power loss as the load current increases. Replacing the OR-ing diode with an NMOS adds somewhat to the circuit complexity, but reduces OR even eliminates diode heat sinks and large area heat spreading copper in the high power application circuit PCB layout.

Disclosure of Invention

Aiming at the defects and problems existing in the using process of the existing vehicle-mounted power supply, the utility model provides the low-power-consumption reverse connection preventing circuit of the vehicle-mounted redundant power supply, the controller provides charge pump gate driving for an external MOS, and a fast response comparator is provided for closing a MOS tube when current is reversed, so that the reverse connection preventing purpose is realized.

The utility model solves the technical problems by adopting the scheme that: the utility model provides a vehicle-mounted redundant power supply low-power consumption prevents reverse connection circuit, includes main input power supply, stand-by power supply, TVS pipe, rectification MOS pipe and control chip and output voltage end thereof, main input power supply: providing a voltage to a back-end load; the standby power supply comprises: providing voltage for the load under the condition of power failure or abnormality of the main power supply; the main input power supply and the standby power supply are grounded through TVS respectively, so that abnormal load throwing pulses of the vehicle-mounted power supply are prevented; the main input power supply and the standby power supply are respectively connected with the source electrodes of the corresponding rectifying MOS tubes, and the drain electrodes of the MOS tubes are connected with the output voltage end; the control chip controls the gate voltage of the main input power supply MOS tube or the standby power supply MOS tube to be turned on or turns off the corresponding MOS tube through the charge pump; the output voltage terminal: and connecting a rear end load.

The output voltage terminal is grounded through a capacitor CP1 and a capacitor C1, respectively. The main input power supply and the standby power supply are respectively provided with independent control chips U1 and U2, and drain electrode output ends of the control chips U1 and U2 are respectively pulled up to the power supply through corresponding resistors R1 and R2. The drain output ends of the control chips U1 and U2 are grounded through corresponding capacitors respectively. The control chip adopts an OR-ing controller.

The utility model has the beneficial effects that: the utility model controls the external MOS to work as an ideal rectifying diode through the HMOS OR-ing controller. The OR-ing controller allows the MOS transistors to replace schottky diodes in the distribution network, thereby reducing power loss and voltage drop. The controller provides charge pump gate drive for external MOS, and provides a fast response comparator to close the MOS tube when current is reversed, so as to realize reverse connection prevention function. The input voltage range of the controller is from +6V to +75V, and the controller can bear transient voltage of +100deg.V, thereby meeting the vehicle-mounted use environment. The controller may also provide FET test mode so that the system can detect mos pipe shorts.

Drawings

Fig. 1 is a functional block diagram of an anti-reverse circuit of the present utility model.

Fig. 2 is a circuit diagram of the anti-reverse connection of the present utility model.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

Example 1: fig. 1 is a functional block diagram of a low-power-consumption reverse connection prevention scheme of a vehicle-mounted redundant power supply. 1 is a main input power supply, and provides voltage for a rear load under normal working conditions; 2 is a standby power supply, and provides voltage for a load under the condition of power failure or abnormality of the main power supply; 3 and 4 are TVS tubes, and are mainly used for preventing the vehicle-mounted power supply from throwing abnormal load pulses; and 5 is a rectifying MOS tube and a control chip thereof, the chip controls the MOS tube gate voltage to open or close the MOS tube through a charge pump, and 6 is an output voltage connected with a rear end load.

Specifically, as shown in fig. 2, the low-power-consumption reverse connection preventing circuit of the vehicle-mounted redundant power supply mainly comprises a main input power supply, a standby power supply, a TVS (transient voltage suppressor) tube, a rectifying MOS (metal oxide semiconductor) tube, a control chip thereof and an output voltage end. The main input power supply and the standby power supply are grounded through TVS (transient voltage suppressor) respectively, so that abnormal load throwing pulses of the vehicle-mounted power supply are prevented. The main input power supply and the standby power supply are respectively connected with the source electrodes of the corresponding rectifying MOS tubes, and the drain electrodes of the MOS tubes are connected with the output voltage end. Rectifying MOS tube and control chip thereof: the control chip controls the gate voltage of the main input power supply MOS tube or the standby power supply MOS tube to be turned on or the corresponding MOS tube to be turned off through the charge pump. The output voltage end is connected with a rear end load. The output voltage terminal is grounded through a capacitor CP1 and a capacitor C1, respectively. The main input power supply and the standby power supply are respectively provided with independent control chips U1 and U2, and drain electrode output ends of the control chips U1 and U2 are respectively pulled up to the power supply through corresponding resistors R1 and R2. The drain output ends of the control chips U1 and U2 are grounded through corresponding capacitors respectively.

D1 and D4 in fig. 2 are TVS tubes for absorbing the load rejection abnormal pulse. U1 and U2 are control chips, and the opening and closing of the external M1 and M2 are controlled by a charge pump inside the chips. The OFF pin is the TEF test mode control input, nFGD is the open drain output of the TEF test circuit, and the R1, R2 resistors pull the drain output up to power, this patent grounds the OFF pin, disabling the TEF test mode. And the CP1 capacitor and the C1 capacitor are power supply filter capacitors, so that the stability of output voltage is ensured. When the input voltage is shorted or reversed, the control chip will respond to turn off the MOS within 50 ns. The external MOS is controlled by the HMOS OR-ing controller to work as an ideal rectifying diode. The OR-ing controller allows the MOS transistors to replace schottky diodes in the distribution network, thereby reducing power loss and voltage drop. The controller provides charge pump gate drive for the external MOS and provides a fast response comparator to turn off the MOS transistor when the current is reversed. The input voltage range of the controller is from +6V to +75V, and the controller can bear transient voltage of +100deg.V, thereby meeting the vehicle-mounted use environment. The controller may also provide FET test mode so that the system can detect mos pipe shorts.

It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a vehicle-mounted redundant power supply low-power consumption prevents reverse connection circuit which characterized in that includes main input power supply, stand-by power supply, TVS pipe, rectification MOS pipe and control chip and output voltage end thereof, main input power supply: providing a voltage to a back-end load; the standby power supply comprises: providing voltage for the load under the condition of power failure or abnormality of the main power supply; the main input power supply and the standby power supply are grounded through TVS respectively, so that abnormal load throwing pulses of the vehicle-mounted power supply are prevented; the main input power supply and the standby power supply are respectively connected with the source electrodes of the corresponding rectifying MOS tubes, and the drain electrodes of the MOS tubes are connected with the output voltage end; the control chip controls the gate voltage of the main input power supply MOS tube or the standby power supply MOS tube to be turned on or turns off the corresponding MOS tube through the charge pump; the output voltage terminal: and connecting a rear end load.

2. The low-power-consumption anti-reverse circuit for the vehicle-mounted redundant power supply according to claim 1, wherein the output voltage end is grounded through a capacitor CP1 and a capacitor C1 respectively.

3. The low-power-consumption reverse connection preventing circuit for the vehicle-mounted redundant power supply according to claim 1, wherein the main input power supply and the standby power supply are respectively provided with independent control chips U1 and U2, and drain output ends of the control chips U1 and U2 are respectively pulled up to power supplies of the control chips through corresponding resistors R1 and R2.

4. The low-power anti-reverse connection circuit of the vehicle-mounted redundant power supply according to claim 3, wherein drain output ends of the control chips U1 and U2 are grounded through corresponding capacitors respectively.