Dual-power redundancy control circuit, circuit board, electronic control unit and vehicle

Abstract

The utility model provides a dual-power redundancy control circuit, a circuit board, an electronic control unit and a vehicle. The dual-power redundancy control circuit comprises a first switching circuit, a second switching circuit, a first protection circuit and a second protection circuit, the first switching circuit is used for controlling connection or disconnection between the first power supply and the load according to the output voltage of the first power supply; the second switching circuit is used for controlling connection or disconnection between the second power supply and the load according to the output voltage of the second power supply; the first protection circuit is used for cutting off current input into the first power supply by the second power supply; the second protection circuit is used for cutting off current input by the first power supply to the second power supply. According to the invention, power redundancy control automation can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of switching power supplies, and in particular relates to a dual-power redundancy control circuit, a circuit board, an electronic control unit and a vehicle. Background Art

[0002] With the rapid development of electronic technology, various onboard devices and systems are increasingly demanding higher reliability and stability in their power supply. In scenarios requiring high reliability, such as rail transit and new energy storage equipment, any brief power interruption can lead to serious system crashes, data loss, and even personal safety hazards.

[0003] Therefore, power redundancy control technology has emerged as a crucial means of ensuring the continuous and stable operation of these critical devices and systems. Power redundancy control technology creates a dual power redundancy mechanism by adding a backup power source to the power supply system. If the primary power source fails, the backup power source automatically and quickly takes over, ensuring uninterrupted power supply and preventing system disruptions caused by power outages. This design not only improves power system reliability but also ensures the continuity of critical services, minimizing disruptions and losses caused by power failures. However, existing power redundancy control technologies mostly rely on control devices, making automated redundancy control difficult to implement. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a dual power supply redundancy control circuit, a circuit board, an electronic control unit and a vehicle, which can automatically perform redundant control on the dual power supplies.

[0005] On the one hand, the utility model provides a dual power supply redundancy control circuit, which is connected to a first power supply and a second power supply. The dual power supply redundancy control circuit includes a first switch circuit, a second switch circuit, a first protection circuit, and a second protection circuit;

[0006] A first end of the first switch circuit is connected to the output end of the first power supply, a second end of the first switch circuit is connected to the first end of the first protection circuit, a third end of the first switch circuit is connected to the second end of the first protection circuit, a fourth end of the first switch circuit is connected to the third end of the first protection circuit, and a fifth end of the first switch circuit is connected to the load. The first switch circuit is used to control conduction or disconnection between the first power supply and the load according to the output voltage of the first power supply;

[0007] A first end of the second switch circuit is connected to the output end of the second power supply, a second end of the second switch circuit is connected to the first end of the second protection circuit, a third end of the second switch circuit is connected to the second end of the second protection circuit, a fourth end of the second switch circuit is connected to the third end of the second protection circuit, and a fifth end of the second switch circuit is connected to the load. The second switch circuit is used to control conduction or disconnection between the second power supply and the load according to the output voltage of the second power supply;

[0008] The first protection circuit is used to cut off the current of the second power supply input to the first power supply;

[0009] The second protection circuit is used to cut off the current input from the first power supply to the second power supply.

[0010] Optionally, the first switch circuit includes a first P-type MOS transistor, a first PNP-type transistor and a second PNP-type transistor;

[0011] The source of the first P-type MOS transistor is respectively connected to the emitter of the first PNP transistor and the output end of the first power supply, the base of the first PNP transistor is connected to the base of the second PNP transistor, the emitter of the second PNP transistor is connected to the drain of the first P-type MOS transistor, the gate of the first P-type MOS transistor is connected to the second end of the first protection circuit, the collector of the first PNP transistor is connected to the first end of the first protection circuit, and the collector of the second PNP transistor is connected to the third end of the first protection circuit.

[0012] Optionally, the second switch circuit includes a second P-type MOS transistor, a third PNP-type transistor and a fourth PNP-type transistor;

[0013] The source of the second P-type MOS transistor is respectively connected to the emitter of the third PNP transistor and the output end of the second power supply, the base of the third PNP transistor is connected to the base of the fourth PNP transistor, the emitter of the fourth PNP transistor is connected to the drain of the second P-type MOS transistor, the gate of the second P-type MOS transistor is connected to the second end of the second protection circuit, the collector of the third PNP transistor is connected to the first end of the second switch circuit, and the collector of the fourth PNP transistor is connected to the third end of the second switch circuit.

[0014] Optionally, the first protection circuit includes a first resistor, a second resistor, and a third resistor;

[0015] One end of the first resistor is respectively connected to the collector of the first PNP transistor and the base of the first PNP transistor, the other end of the first resistor and one end of the third resistor are connected to the ground in parallel, the other end of the third resistor is respectively connected to one end of the second resistor and the collector of the second PNP transistor, and the other end of the second resistor is connected to the gate of the first P-type MOS transistor.

[0016] Optionally, the second protection circuit includes a fourth resistor, a fifth resistor, and a sixth resistor;

[0017] One end of the fourth resistor is respectively connected to the collector of the third PNP transistor and the base of the third PNP transistor, the other end of the fourth resistor is connected to one end of the sixth resistor and one end of the third resistor and is connected to the ground, the other end of the sixth resistor is respectively connected to one end of the fifth resistor and the collector of the fourth PNP transistor, and the other end of the fifth resistor is connected to the gate of the second P-type MOS transistor.

[0018] Optionally, both the first P-type MOS transistor and the second P-type MOS transistor are P-channel enhancement mode field effect transistors.

[0019] Optionally, the conduction conditions of the first P-type MOS transistor and the second P-type MOS transistor are configured as follows: V GS <-0.4V; where V GS Represents the difference between the gate voltage and the source voltage.

[0020] In a second aspect, the utility model provides a circuit board including the above-mentioned dual power supply redundant control circuit.

[0021] In a third aspect, the present invention provides an electronic control unit comprising the above-mentioned circuit board.

[0022] In a fourth aspect, the present invention provides a vehicle comprising the above-mentioned electronic control unit.

[0023] The beneficial effects of the utility model are:

[0024] The dual power supply redundant control circuit provided by the present invention can respectively control the on / off between the first power supply, the second power supply and the load through the first switching circuit, the second switching circuit, the first protection circuit and the second protection circuit, and can achieve the purpose of redundant control without relying on control devices, thereby realizing the automation of power supply redundant control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the dual power supply redundant control circuit provided by the utility model. DETAILED DESCRIPTION

[0026] In response to the problem that traditional dual-power redundant control circuits rely on control devices and are difficult to achieve automated redundant control, the utility model provides a dual-power redundant control circuit, a circuit board, an electronic control unit and a vehicle. The dual-power redundant control circuit can control the on and off between the first power supply, the second power supply and the load respectively through a first switching circuit and a second switching circuit, and can achieve the purpose of redundant control without relying on control devices, thereby realizing automated power redundant control.

[0027] like Figure 1As shown, the dual power supply redundancy control circuit provided by the present invention is connected to the first power supply and the second power supply. The dual power supply redundancy control circuit includes a first switch circuit 101 , a second switch circuit 102 , a first protection circuit 103 and a second protection circuit 104 .

[0028] In which, the first end of the first switch circuit 101 is connected to the output end of the first power supply V1, the second end of the first switch circuit 101 is connected to the first end of the first protection circuit 103, the third end of the first switch circuit 101 is connected to the second end of the first protection circuit 103, the fourth end of the first switch circuit 101 is connected to the third end of the first protection circuit 103, and the fifth end of the first switch circuit 101 is connected to the load X. The first switch circuit 101 is used to control the conduction or disconnection between the first power supply V1 and the load X according to the output voltage of the first power supply V1.

[0029] Specifically, such as Figure 1 As shown, the first switch circuit 101 includes a first P-type MOS transistor P1, a first PNP-type transistor S1 and a second PNP-type transistor S2;

[0030] The source of the first P-type MOS transistor P1 is respectively connected to the emitter of the first PNP-type transistor S1 and the output end of the first power supply V1; the base of the first PNP-type transistor S1 is connected to the base of the second PNP-type transistor S2; the emitter of the second PNP-type transistor S2 is connected to the drain of the first P-type MOS transistor P1; the gate of the first P-type MOS transistor P1 is connected to the second end of the first switch circuit 101; the collector of the first PNP-type transistor S1 is connected to the first end of the first switch circuit 101; and the collector of the second PNP-type transistor S2 is connected to the third end of the first switch circuit 101.

[0031] The first protection circuit 103 includes a first resistor R1 , a second resistor R2 , and a third resistor R3 .

[0032] One end of the first resistor R1 is connected to the collector of the first PNP transistor S1 and the base of the first PNP transistor S1, respectively. The other end of the first resistor R1 and one end of the third resistor R3 are connected in parallel to the ground. The other end of the third resistor R3 is connected to one end of the second resistor R2 and the collector of the second PNP transistor S2, respectively. The other end of the second resistor R2 is connected to the gate of the first P-type MOS transistor P1.

[0033] A first end of the second switch circuit 102 is connected to the output end of the second power supply V2, a second end of the second switch circuit 102 is connected to the first end of the second protection circuit 104, a third end of the second switch circuit 102 is connected to the second end of the second protection circuit 104, a fourth end of the second switch circuit 102 is connected to the third end of the second protection circuit 104, and a fifth end of the second switch circuit 102 is connected to the load X. The second switch circuit 102 is used to control the conduction or disconnection between the second power supply V2 and the load X according to the output voltage of the second power supply V2.

[0034] The second protection circuit 104 includes a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;

[0035] One end of the fourth resistor R4 is connected to the collector of the third PNP transistor S3 and the base of the third PNP transistor S3, respectively. The other end of the fourth resistor is connected to one end of the sixth resistor R6 and one end of the third resistor R3, and is connected to ground. The other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and the collector of the fourth PNP transistor S4, respectively. The other end of the fifth resistor R5 is connected to the gate of the second P-type MOS transistor P2.

[0036] It should be noted that the first protection circuit 103 is used to cut off the current input from the second power source V2 to the first power source V1. The second protection circuit 104 is used to cut off the current input from the first power source V1 to the second power source V2.

[0037] In the present invention, the first P-type MOS transistor P1 and the second P-type MOS transistor P2 are both P-channel enhancement mode field effect transistors.

[0038] In actual applications, when the first power supply V1 and the second power supply V2 are operating normally, the voltage output by the first power supply V1 (e.g., 1.2V) is supplied to the load X via the body diode of the first P-type MOS transistor P1. However, due to a certain voltage drop (e.g., 0.6V) across the body diode, the voltage received by the load X is only approximately 0.6V, which cannot meet the voltage requirement of the load X. At this time, the first PNP-type transistor S1 meets the conduction condition and turns on. Current flows through the first PNP-type transistor S1 into the gate of the first P-type MOS transistor P1, causing the first P-type MOS transistor P1 to meet the conduction condition and turn on. The conduction voltage drop of the first P-type MOS transistor P1 is only approximately 20mV, so that the voltage value (1.2V) received by the load X meets the voltage requirement of the load X, thereby effectively supplying power to the load X. At the same time, current flows into the collector of the fourth PNP transistor S4 via the third resistor R3 and the fourth resistor R4. The base voltage is higher than the emitter voltage, and the collector voltage is lower, causing the transistor to enter a saturated state. The fourth PNP transistor S4 is turned on. Under the action of the fourth resistor R4, the gate voltage of the second P-type MOS transistor P2 is higher than the source voltage, and the second P-type MOS transistor P2 is turned off, thereby cutting off the current from the first power supply V1 to the second power supply V2. At this time, the first power supply V1 is connected to the load X, while the second power supply V2 is disconnected from the load X. This allows one of the power supplies to be controlled to supply power to the load X when the two power supplies are operating normally. R1 is 1 kΩ, R2 is 1 kΩ, R3 is 1 kΩ, R4 is 1 kΩ, R5 is 1 kΩ, and R6 is 1.5 kΩ.

[0039] When the first power supply V1 is abnormal (not supplying power) and the second power supply V2 is normal (supplying power), the voltage output by the second power supply V2 (e.g., 1.2V) is supplied to the load X via the body diode of the second P-type MOS transistor P2. However, due to a certain voltage drop (e.g., 0.6V) across the body diode, the voltage received by the load X is only approximately 0.6V, failing to meet the voltage requirement of the load X. At this point, the third PNP transistor S3 meets the conduction condition and turns on. Current flows through the third PNP transistor S3 into the gate of the second P-type MOS transistor P2, causing the second P-type MOS transistor P2 to meet the conduction condition and turn on. Furthermore, the conduction voltage drop of the third P-type MOS transistor is only approximately 20mV, so that the voltage value (1.2V) received by the load X meets the voltage requirement of the load X, thereby effectively supplying power to the load X. At the same time, current flows into the collector of the first PNP transistor S1 via the fourth resistor R4 and the first resistor R1. The base voltage is higher than the emitter voltage, and the collector voltage is lower. The transistor enters a saturated state, and the first PNP transistor S1 is turned on. Under the action of the first resistor R1, the gate voltage of the first P-type MOS transistor P1 is higher than the source voltage. The first P-type MOS transistor P1 is turned off, cutting off the current from the second power supply V2 to the first power supply V1. At this time, the second power supply V2 is connected to the load X, and the first power supply V1 is disconnected from the load X. This allows the other power supply to quickly and automatically take over when one power supply operates abnormally, thereby ensuring the continuity of critical services, reducing service interruptions and losses caused by power failures, and achieving automated redundancy control.

[0040] It can be seen that the dual power supply redundant control circuit provided by the utility model can respectively control the on and off between the first power supply, the second power supply and the load X through the first switching circuit, the second switching circuit, the first protection circuit and the second protection circuit, and can achieve the purpose of redundant control without relying on control devices, thereby realizing the automation of power supply redundant control.

[0041] Another advantage of this dual-power redundancy control circuit is its ability to achieve 1V low-voltage power redundancy. The output current of this dual-power redundancy control circuit depends on the power consumption requirements of the MOS tube. At room temperature, the supply current can reach 5A.

[0042] On the other hand, the embodiment of the present invention further provides a circuit board, which may include the above-mentioned Figure 1 Dual power supply redundant control circuit.

[0043] On the other hand, an embodiment of the present invention further provides an electronic control unit, which includes the circuit board described in the above technical solution.

[0044] On the other hand, an embodiment of the present invention further provides a vehicle, which includes the electronic control unit described in the above technical solution.

[0045] The beneficial effects of the circuit board, the electronic control unit, and the vehicle are the same as those of the dual power supply redundant control circuit and will not be repeated here.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0047] The one or more embodiments of this application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application should be included in the scope of protection of this application.

Claims

1. A dual power supply redundant control circuit, connected to a first power supply and a second power supply, characterized in that: The dual power redundancy control circuit includes a first switch circuit, a second switch circuit, a first protection circuit and a second protection circuit; A first end of the first switch circuit is connected to the output end of the first power supply, a second end of the first switch circuit is connected to the first end of the first protection circuit, a third end of the first switch circuit is connected to the second end of the first protection circuit, a fourth end of the first switch circuit is connected to the third end of the first protection circuit, and a fifth end of the first switch circuit is connected to a load; The first end of the second switching circuit is connected to the output end of the second power supply, the second end of the second switching circuit is connected to the first end of the second protection circuit, the third end of the second switching circuit is connected to the second end of the second protection circuit, the fourth end of the second switching circuit is connected to the third end of the second protection circuit, and the fifth end of the second switching circuit is connected to the load.

2. The dual power supply redundant control circuit according to claim 1, characterized in that: The first switch circuit includes a first P-type MOS transistor, a first PNP-type transistor and a second PNP-type transistor; The source of the first P-type MOS transistor is respectively connected to the emitter of the first PNP transistor and the output end of the first power supply, the base of the first PNP transistor is connected to the base of the second PNP transistor, the emitter of the second PNP transistor is connected to the drain of the first P-type MOS transistor, the gate of the first P-type MOS transistor is connected to the second end of the first protection circuit, the collector of the first PNP transistor is connected to the first end of the first protection circuit, and the collector of the second PNP transistor is connected to the third end of the first protection circuit.

3. The dual power supply redundant control circuit according to claim 2, characterized in that: The second switch circuit includes a second P-type MOS transistor, a third PNP-type transistor and a fourth PNP-type transistor; The source of the second P-type MOS transistor is respectively connected to the emitter of the third PNP transistor and the output end of the second power supply, the base of the third PNP transistor is connected to the base of the fourth PNP transistor, the emitter of the fourth PNP transistor is connected to the drain of the second P-type MOS transistor, the gate of the second P-type MOS transistor is connected to the second end of the second protection circuit, the collector of the third PNP transistor is connected to the first end of the second protection circuit, and the collector of the fourth PNP transistor is connected to the third end of the second protection circuit.

4. The dual power supply redundant control circuit according to claim 3, characterized in that: The first protection circuit includes a first resistor, a second resistor and a third resistor; One end of the first resistor is respectively connected to the collector of the first PNP transistor and the base of the first PNP transistor, the other end of the first resistor and one end of the third resistor are connected to the ground in parallel, the other end of the third resistor is respectively connected to one end of the second resistor and the collector of the second PNP transistor, and the other end of the second resistor is connected to the gate of the first PMOS transistor.

5. The dual power supply redundant control circuit according to claim 4, characterized in that: The second protection circuit includes a fourth resistor, a fifth resistor and a sixth resistor; One end of the fourth resistor is respectively connected to the collector of the third PNP transistor and the base of the third PNP transistor, the other end of the fourth resistor is connected to one end of the sixth resistor and one end of the third resistor and to the ground, the other end of the sixth resistor is respectively connected to one end of the fifth resistor and the collector of the fourth PNP transistor, and the other end of the fifth resistor is connected to the gate of the second P-type MOS transistor.

6. The dual power supply redundant control circuit according to claim 5, characterized in that: The first P-type MOS transistor and the second P-type MOS transistor are both P-channel enhancement mode field effect transistors.

7. A circuit board, characterized in that: The invention comprises a dual power supply redundant control circuit as claimed in any one of claims 1 to 6.

8. An electronic control unit, characterized in that: Comprising the circuit board as claimed in claim 7.

9. A vehicle, characterized in that: The electronic control unit as claimed in claim 8.

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