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

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 anti-reverse power-on system

technical field

The utility model relates to the field of electronic technology, in particular to a power-on system with low loss and anti-reverse connection.

Background technique

Generally, in the field of on-board electronic controllers, the electronic controllers are required to work in a dormant state (current consumption < 100uA) before the wake-up signal is valid. The usual design and implementation method is to use a system basis chip SBC with a low power consumption mode. However, This implementation has the following problems:

(1) The battery terminal reverse connection protection requirement cannot be met, so an additional power diode is required. The introduction of the diode increases the power supply loss and reduces the actual power supply voltage;

(2) In order to meet the power supply requirements and low power consumption requirements in the sleep state, hard-wired wake-up (ignition signal or other external hard-wired wake-up signal), remote wake-up (CAN communication), etc., need to use a dedicated chip with a high degree of integration. Dedicated chips inevitably have the disadvantages of high cost and poor versatility;

(3) The power supply topology is limited by dedicated chips, and the design flexibility is poor.

Therefore, a power-on system that takes into account both low loss and anti-reverse connection is required.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art, and provide a low-loss anti-reverse connection power-on system, which consists of back-to-back MOSFETs to form an anti-reverse connection and low power consumption power-on switch. The power-on switch is controlled by CAN The enable output control of the transceiver, the enable output control of the CAN transceiver is triggered by the hard-wired wake-up signal or the CAN communication signal. After the power-on switch is closed, it supplies power to the subsequent power supply or other loads, realizing reverse connection protection and low power consumption. Design decoupling from power supply topology design.

In order to achieve the above purpose, the present invention provides a low-loss anti-reverse-connection power-on system, the power-on system includes an input end and an output end, and a power-on switch, CAN transceiver, triode and voltage divider resistor, the power-on switch includes MOSFET Q1 and MOSFET Q2 connected in back-to-back series, the D pole of the MOSFET Q1 is used to connect to the power supply, and the S pole of the MOSFET Q1 is connected to The S pole of the MOSFET Q2 and the G pole of the MOSFET Q1 are connected to the G pole of the MOSFET Q2, the D pole of the MOSFET Q2 is used for outputting current and voltage, and the S pole of the MOSFET Q1 is connected to the G pole of the MOSFET Q2. into the power input terminal of the CAN transceiver, the CAN transceiver is set with a wake-up module, the wake-up signal input terminal of the wake-up module is set with a diode, and the wake-up module is set to output an enabling signal according to the wake-up signal , the CAN transceiver is connected with the triode, and the triode is connected to the S pole of the MOSFET Q2 through two voltage dividing resistors.

Optionally, the wake-up signal input terminal includes at least one hard-wire wake-up signal input terminal, and each of the hard-wire wake-up signal input terminals is provided with the diode.

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

Optionally, the diode is a Schottky diode.

Optionally, 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.

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

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

By adopting the low-loss anti-reverse-connection power-on system of the present invention, back-to-back MOSFETs are used to form a power-on switch with anti-reverse connection and low power consumption, the power-on switch is controlled by the enabling output of the CAN transceiver, and the enabling output of the CAN transceiver is The output control is triggered by the hard-wired wake-up signal or the CAN communication signal. After the power-on switch is closed, it supplies power to the rear-stage power supply or other loads, realizing the decoupling of reverse connection protection, low power consumption design and power supply topology design.

Description of drawings

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

Detailed ways

In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.

As shown in FIG. 1, an embodiment of a low-loss anti-reverse-connection power-on system provided by the present invention is applied in a new energy vehicle motor controller, including back-to-back anti-reverse-connection and power-on control MOSFETs , MOSFET turn-on and turn-off control circuits, CAN transceiver circuits, etc.

Specifically, the power-on system includes an input terminal KL30 and an output terminal Vout, and a power-on switch, a CAN transceiver IC1, a transistor and a voltage divider are arranged between the input terminal and the output terminal. The power-on switch Including MOSFET Q1 and MOSFET Q2 connected in back-to-back series, the D pole of the MOSFET Q1 is used to connect to the power supply KL30, the S pole of the MOSFET Q1 is connected to the S pole of the MOSFET Q2, and the MOSFET Q1 The G pole is connected to the G pole of the MOSFET Q2, the D pole of the MOSFET Q2 is used to output current and voltage, and the S pole of the MOSFET Q1 is connected to the power input terminal VCC of the CAN transceiver, so the The CAN transceiver is set with a wake-up module WAK, and the two wake-up signal input ends of the wake-up module are both set with Schottky diodes D1, and the two wake-up signal input ends are respectively the ignition signal input KL15 and other external hard-wired wake-up signal inputs. EXT_WAK and the wake-up module is set to output an enable signal according to the wake-up signal, the CAN transceiver is connected to the triode T1, and the triode T1 is connected to the S pole of MOSFETQ2.

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.

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 the voltage dividing resistor R3, and the two G poles in the MOSFET Q1 and MOSFET Q2 are connected. The branch between them is connected to the collector of the triode through the voltage dividing resistor R4.

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

The utility model provides specific working steps of a low-loss anti-reverse-connection power-on system:

(1) Normal power supply (not reversed)

Step 1: The battery voltage KL30 supplies power to the CAN transceiver IC1 through the body diode of the anti-reverse MOSFET Q1. When the CAN transceiver is powered by VCC, the wake-up circuit works, and the working current consumption is less than 100uA.

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

Step 2: The enable signal INH is active at high level, and the transistor T1 is made to work in the saturated conduction region through the current limiting resistor R1. The voltage divider network formed by R3 and R4 generates a suitable voltage between the gate and source of MOSFET Q1 and Q2. The turn-on voltage makes Q1 and Q2 turn on, and Z1 is used to clamp the voltage between the gate and the gate not to exceed the allowable value of the device.

Step 3: Q1 and Q2 are turned on, and the battery voltage KL30 supplies power to the CAN transceiver IC1 and the subsequent load through the drain-source on-resistance Rdson of the MOSFETs Q1 and Q2, respectively.

(2) Battery reverse connection, reverse connection protection

When the battery is reversely connected, the body diode of MOSFET Q1 is turned off, and the Schottky diode D1 is turned off to realize reverse connection protection.

By adopting the low-loss anti-reverse-connection power-on system of the present invention, back-to-back MOSFETs are used to form a power-on switch with anti-reverse connection and low power consumption, the power-on switch is controlled by the enabling output of the CAN transceiver, and the enabling output of the CAN transceiver is The output control is triggered by the hard-wired wake-up signal or the CAN communication signal. After the power-on switch is closed, it supplies power to the rear-stage power supply or other loads, realizing the decoupling of reverse connection protection, low power consumption design and power supply topology design.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and changes can still be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense.

Claims (7)

1. a low-loss anti-reverse-connection power-on system, characterized in that the power-on system comprises an input end and an output end, and a power-on switch, a CAN transceiver, a A triode and a voltage dividing resistor, the power-on switch includes a MOSFET Q1 and a MOSFET Q2 that are connected in series back-to-back, the D pole of the MOSFET Q1 is used to connect to the power supply, and the S pole of the MOSFET Q1 is connected to the MOSFET The S pole of Q2, the G pole of the MOSFET Q1 is connected to the G pole of the MOSFET Q2, the D pole of the MOSFET Q2 is used for outputting current and voltage, and the S pole of the MOSFET Q1 is connected to the The power input terminal of the CAN transceiver, the CAN transceiver is set with a wake-up module, the wake-up signal input terminal of the wake-up module is set with a diode, and the wake-up module is set to output an enabling signal according to the wake-up signal, the The CAN transceiver is connected with the triode, and the triode is connected to the S pole of the MOSFET Q2 through two voltage dividing resistors. 2. The low-loss anti-reverse-connection power-on system according to claim 1, wherein the wake-up signal input terminal comprises at least one hard-wire wake-up signal input terminal, and each of the hard-wire wake-up signal input terminals The diodes are provided at both ends. 3 . The power-on system with low loss and anti-reverse connection according to claim 2 , wherein the wake-up signal input terminal comprises an ignition signal input terminal. 4 . 4 . The low-loss anti-reverse-connection power-on system according to claim 1 , wherein the diode is a Schottky diode. 5 . 5. The low-loss anti-reverse-connection power-on system according to claim 1, wherein the branch between the two S poles in the MOSFET Q1 and the MOSFET Q2 is connected between the two G poles through a rectifier diode branch. 6. The low-loss anti-reverse-connection power-on system according to claim 1, wherein the branch between the two S poles in the MOSFET Q1 and the MOSFET Q2 is connected by one of the two voltage dividing resistors The branch between the two G poles connected in phase, the branch between the two G poles in the MOSFET Q1 and MOSFET Q2 is connected to the collector of the triode through the other of the two voltage dividing resistors . 7 . The low-loss anti-reverse-connection power-on system according to claim 1 , wherein a current limiting resistor is connected in series with the base of the triode. 8 .

Images