CN210053236U

CN210053236U - Low-loss reverse connection prevention power-on system

Info

Publication number: CN210053236U
Application number: CN201921202612.3U
Authority: CN
Inventors: 韩伟; 祁华铭; 周宣; 陈庆旭
Original assignee: SHANGHAI JINMAI ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: SHANGHAI JINMAI ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-02-11
Anticipated expiration: 2029-07-29

Abstract

The utility model relates to a low-loss prevents last electric system of transposition, last electric system include input and output, input and output between set up last electric switch, CAN transceiver, triode and divider resistance. Adopt the utility model discloses a low-loss prevents last electric system that connects, constitute through back-to-back MOSFET and prevent the last electric switch that connects the low-power consumption, this last electric switch is by the messenger output control of CAN transceiver, and the messenger output control of CAN transceiver is triggered by hardwire wake-up signal or CAN communication signal, goes up the electric switch closed back and supplies power for back level power or other loads, has realized the decoupling zero of reverse connection protection, low-power consumption design and power supply topology design.

Description

Low-loss reverse connection prevention power-on system

Technical Field

The utility model relates to the field of electronic technology, specifically indicate a last electric system of preventing reverse connection of low-loss.

Background

Generally, in the field of on-board electronic controllers, the electronic controller is required to operate in a sleep state (consumption current <100uA) before the wake-up signal is active, and a common design implementation is to use a system base chip SBC with a low power consumption mode, however, the following problems exist in this implementation:

(1) the requirement of reverse connection protection of a battery end cannot be met, so that a power diode needs to be additionally added, the power supply loss is increased due to the introduction of the diode, and the actual power supply voltage is reduced;

(2) in order to meet the power supply requirement and the low power consumption requirement in a dormant state, hard line awakening (ignition signals or other external hard line awakening signals), remote awakening (CAN communication) and the like, a special chip with higher integration level is required to be used, and the special chip has the defects of high cost and poor universality inevitably;

(3) the power supply topology is limited by a special chip, and the design flexibility is poor.

Therefore, a power-on system with low loss and reverse connection prevention is needed

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming above-mentioned prior art's shortcoming, provide a low-loss last electric system of preventing joining conversely, constitute through MOSFET back-to-back and prevent joining the last electric switch of low-power consumption, this last electric switch is by the messenger output control of CAN transceiver, the messenger output control of CAN transceiver is triggered by hardwire wake-up signal or CAN communication signal, go up the electric switch closed back and supply power for back level power or other loads, the protection of joining conversely has been realized, the decoupling zero of low-power consumption design and power supply topology design.

In order to achieve the above object, the present invention provides a low-loss reverse-connection-prevention power-on system, which comprises an input end and an output end, wherein a power-on switch, a CAN transceiver, a triode and a voltage-dividing resistor are arranged between the input end and the output end, the power-on switch comprises a MOSFET Q1 and a MOSFET Q2 which are connected in series back to back, a D electrode of the MOSFET Q1 is used for connecting a power supply, an S electrode of the MOSFET Q1 is connected to the S electrode of the MOSFET Q2, a G electrode of the MOSFET Q1 is connected to the G electrode of the MOSFET Q2, a D electrode of the MOSFET Q2 is used for outputting current and voltage, an S electrode of the MOSFET Q1 is connected to a power input end of the CAN transceiver, the CAN transceiver is provided with a wake-up module, a wake-up signal input end of the wake-up module is provided with a diode, and the wake-up module is configured to output an energy signal according to the wake-up signal, the CAN transceiver is connected with the triode, and the triode is connected with the S pole of the MOSFET Q2 through two divider resistors.

Optionally, the wake-up signal input end includes at least one hard-wired wake-up signal input end, and each hard-wired wake-up signal input end is provided with the diode.

Optionally, the wake-up signal input includes an ignition signal input.

Optionally, the diode is a schottky diode.

Optionally, the branch between the two S poles in the MOSFET Q1 and the MOSFET Q2 is connected to the branch between the two G poles through a rectifier diode.

Optionally, the branch between the two S-poles in the MOSFET Q1 and the MOSFET Q2 is connected to the branch between the two G-poles connected to each other through one of two voltage dividing resistors, and the branch between the two G-poles in the MOSFET Q1 and the MOSFET Q2 is connected to the collector of the triode through the other one of the two voltage dividing resistors.

Optionally, the base of the triode is connected in series with a current limiting resistor.

Adopt the utility model discloses a low-loss prevents last electric system that connects, constitute through back-to-back MOSFET and prevent the last electric switch that connects the low-power consumption, this last electric switch is by the messenger output control of CAN transceiver, and the messenger output control of CAN transceiver is triggered by hardwire wake-up signal or CAN communication signal, goes up the electric switch closed back and supplies power for back level power or other loads, has realized the decoupling zero of reverse connection protection, low-power consumption design and power supply topology design.

Drawings

Fig. 1 is a schematic circuit diagram of the low-loss reverse-connection-prevention power-on system of the present invention.

Detailed Description

In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.

As shown in fig. 1, for the utility model provides a low-loss prevents last electric system embodiment of reverse connection, this embodiment is used in new energy automobile motor controller, including back to back prevent reverse connection and go up electric control MOSFET, MOSFET turns on and shuts off control circuit, CAN transceiver circuit etc..

Specifically, the power-on system comprises an input end KL30 and an output end Vout, a power-on switch, a CAN transceiver IC1, a triode and a voltage-dividing resistor are arranged between the input end and the output end, the power-on switch comprises a MOSFET Q1 and a MOSFET Q2 which are connected in series back to back, a D electrode of the MOSFET Q1 is used for connecting a power supply KL30, an S electrode of the MOSFET Q1 is connected to an S electrode of the MOSFET Q2, a G electrode of the MOSFET Q1 is connected to a G electrode of the MOSFET Q2, a D electrode of the MOSFET Q2 is used for outputting current and voltage, an S electrode of the MOSFET Q1 is connected to a power supply input end VCC of the CAN transceiver, the CAN transceiver is provided with a wake-up module WAK, two wake-up signal input ends of the wake-up module are both provided with a schottky diode D1, the two wake-up signal input ends are respectively an ignition signal input KL15, other external hard wire wake-up signal input ends WAK and the wake-up module is arranged to enable output wake-up signals according to wake-, the CAN transceiver is connected with the triode T1, and the triode T1 is connected with the S pole of the MOSFET Q2 through two divider resistors R3 and R4.

The branch circuit between two S poles in the MOSFET Q1 and the MOSFET Q2 is connected with the branch circuit between two G poles through a rectifier diode.

The branch circuit between two S poles in the MOSFET Q1 and the MOSFET Q2 is connected with the branch circuit between two G poles which are connected with each other through a voltage dividing resistor R3, and the branch circuit between two G poles in the MOSFET Q1 and the MOSFET Q2 is connected with the collector of the triode through a voltage dividing resistor R4.

The base of the triode is connected with a current limiting resistor R1 in series.

The utility model provides a low-loss prevents the work of the last electric system of transposition concrete step:

(1) normal power supply (not reverse connection)

Step 1: the battery voltage KL30 supplies power to the CAN transceiver IC1 through a body diode of the anti-reverse MOSFET Q1, and the CAN transceiver wakes up the circuit to work under the condition that VCC supplies power, and the work consumption current is less than 100 uA.

When the wake-up signal is active, for example, the ignition signal KL15 goes high or CANH-CANL is active, the enable signal INH is output and active high.

Step 2: the enable signal INH is active high, the transistor T1 is operated in a saturated conduction region through the current limiting resistor R1, the voltage dividing network formed by R3 and R4 generates a suitable turn-on voltage between the gates and sources of the MOSFETs Q1 and Q2, so that Q1 and Q2 are turned on, and Z1 is used for clamping the voltage value between the gates and the gates not to exceed the allowable device value.

And step 3: the Q1 and the Q2 are turned on, and the battery voltage KL30 supplies power to the CAN transceiver IC1 and the rear-stage load through drain-source on-resistances Rdson of the MOSFETs Q1 and Q2, respectively.

(2) Reverse connection and protection of battery

When the battery is reversely connected, the body diode of the MOSFET Q1 is cut off, and the Schottky diode D1 is cut off, so that reverse connection protection is realized.

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. A low-loss reverse-connection-prevention power-on system is characterized by comprising an input end and an output end, wherein a power-on switch, a CAN transceiver, a triode and a voltage-dividing resistor are arranged between the input end and the output end, the power-on switch comprises a MOSFET Q1 and a MOSFET Q2 which are connected in series back to back, the D electrode of the MOSFET Q1 is used for being connected with a power supply, the S electrode of the MOSFET Q1 is connected with the S electrode of the MOSFET Q2, the G electrode of the MOSFET Q1 is connected with the G electrode of the MOSFET Q2, the D electrode of the MOSFET Q2 is used for outputting current and voltage, the S electrode of the MOSFET Q1 is connected with the power supply input end of the CAN transceiver, the CAN transceiver is provided with a wake-up module, the wake-up signal input end of the wake-up module is provided with a diode, and the wake-up module is arranged for outputting an enable signal according to the wake-up signal, the CAN transceiver is connected with the triode, the triode is connected to the S pole of the MOSFET Q2 through two divider resistors.

2. A power system with low loss and reverse connection prevention according to claim 1, wherein said wake-up signal input comprises at least one hard-wired wake-up signal input, each of said hard-wired wake-up signal inputs being provided with said diode.

3. A power system with low loss reverse connection prevention according to claim 2 wherein said wake-up signal input comprises an ignition signal input.

4. A low loss reverse-connection prevention power-on system as claimed in claim 1, wherein said diode is a schottky diode.

5. The power-on system with low loss and reverse connection prevention of claim 1, wherein the branch between the two S poles of the MOSFET Q1 and the MOSFET Q2 is connected to the branch between the two G poles through a rectifier diode.

6. The power-on system with low loss and reverse connection prevention according to claim 1, wherein the branch between the two S poles in the MOSFET Q1 and the MOSFET Q2 is connected to the branch between the two G poles connected in phase through one of two voltage dividing resistors, and the branch between the two G poles in the MOSFET Q1 and the MOSFET Q2 is connected to the collector of the triode through the other one of the two voltage dividing resistors.

7. The power system of claim 1, wherein the base of the transistor is connected in series with a current limiting resistor.