Detection circuit for fast charging relay sticking and relay module

Abstract

The application provides a detection circuit for adhesion of a fast-charging relay and a relay module, and belongs to the technical field of relay adhesion detection. The detection circuit comprises a first resistor, one end of the first resistor being connected with a positive electrode of a battery; a second resistor, one end of the second resistor being connected with the other end of the first resistor; a third resistor, one end of the third resistor being connected with one end of the first resistor and one end of a first relay; a third relay, one end of the third relay being connected with the other end of the first relay; a fourth resistor, one end of the fourth resistor being connected with the other end of the third relay; a fifth resistor; a sixth resistor; a seventh resistor; a fourth relay; and a controller. The detection circuit can reduce hardware circuit redundancy, save costs, and when adhesion of the fast-charging relay occurs, the fast-charging port only causes adhesion of the bus to the controller shell to generate a voltage, and the unadhered bus does not generate a voltage, thereby improving port safety.

Description

Technical Field

[0001] This invention relates to the field of relay adhesion detection technology, and specifically to a detection circuit and relay module for fast charging relay adhesion. Background Technology

[0002] Currently, my country's new energy vehicle industry is developing rapidly. Battery systems are the power source for new energy vehicles, and zero emissions during operation are their biggest advantage, thus receiving strong government support. However, due to the frequent safety accidents caused by charging new energy vehicles, safety issues related to these vehicles have received increasing attention. In the fast charging circuit of electric vehicles, a relay is needed to disconnect the fast charging port from the power battery under abnormal operating conditions or when charging is not in progress. In existing technology, the fast charging relay sticking detection and bus voltage detection circuits operate separately, resulting in hardware circuit redundancy. Furthermore, when one relay sticks, due to the series connection, the other relay will also detect voltage, leading to low circuit safety. Summary of the Invention

[0003] The purpose of this invention is to provide a detection circuit and relay module for fast charging relay sticking. This detection circuit can reduce hardware circuit redundancy, save costs, and when fast charging relay sticking occurs, only the sticking busbar of the fast charging port generates voltage to the controller housing, while the unsticking busbar will not generate voltage, thus improving port safety.

[0004] To achieve the above objectives, the present invention provides a detection circuit for fast charging relay adhesion, wherein the fast charging relay is divided into a first relay connected to the positive terminal of the battery and a second relay connected to the negative terminal of the battery, and the detection circuit includes:

[0005] The first resistor, one end of which is connected to the positive terminal of the battery;

[0006] A second resistor, one end of which is connected to the other end of the first resistor;

[0007] A third resistor, one end of which is connected to one end of the first resistor and one end of the first relay;

[0008] A third relay, one end of which is connected to the other end of the first relay;

[0009] A fourth resistor, one end of which is connected to the other end of the third relay;

[0010] The fifth resistor, one end of which is connected to the other end of the third resistor;

[0011] A sixth resistor, one end of which is connected to the other end of the fourth resistor, and the other end of which is connected to the negative terminal of the battery;

[0012] A seventh resistor, one end of which is connected to the other end of the fifth resistor, and the other end of which is connected to one end of the second relay;

[0013] A fourth relay, one end of which is connected to the other end of the third resistor, and the other end of the fourth relay is connected to the other end of the fourth resistor;

[0014] A controller, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the other end of the fifth resistor.

[0015] Optionally, the controller includes a first switch, a first end of which is connected to the other end of the first resistor, and a second end of which is connected to the other end of the fifth resistor.

[0016] Optionally, the controller includes an isolation chip, one end of which is connected to the third terminal of the first switch.

[0017] Optionally, the controller includes an operational amplifier, the input of which is connected to the other end of the isolation chip.

[0018] Optionally, the controller includes a digital signal processor connected to the output of the operational amplifier.

[0019] On the other hand, the present invention also provides a relay module, the relay module comprising:

[0020] The first relay is connected to the positive terminal of the power supply;

[0021] The second relay is connected to the negative terminal of the power supply;

[0022] The third relay, one end of which is connected to the other end of the first relay, and the other end of the third relay is connected to one end of the fourth resistor;

[0023] A fourth relay, one end of which is connected to the other end of the fifth resistor, and the other end of the fourth relay is connected to the other end of the fourth resistor;

[0024] The relay module further includes a detection circuit as described in any one of claims 1 to 5.

[0025] Optionally, the relay module further includes:

[0026] A thin-film capacitor, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to the negative terminal of the battery.

[0027] Optionally, the relay module further includes:

[0028] The fourth relay, one end of which is connected to a +5V power supply;

[0029] The transistor has its collector (C) terminal connected to the other end of the fourth relay, and its emitter (E) terminal grounded.

[0030] A diode, wherein the negative terminal of the diode is connected to one end of the fourth relay, and the positive terminal of the diode is connected to the other end of the fourth relay;

[0031] The eighth resistor has one end connected to the base (B) of the transistor and the other end connected to the digital signal processor.

[0032] The ninth resistor has one end connected to one end of the eighth resistor, and the other end of the ninth resistor is grounded.

[0033] Optionally, the relay module further includes:

[0034] The first capacitor has one end connected to a +5V power supply and the other end grounded.

[0035] Through the above technical solution, the present invention provides a detection circuit and relay module for fast charging relay sticking. This detection circuit, by connecting a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor, and then controlling the relay opening and closing via a controller, can detect the voltage in the circuit. This detection circuit reduces hardware redundancy, saves costs, and when the fast charging relay sticks, only the sticking busbar at the fast charging port generates voltage to the controller housing; the unsticking busbar does not generate voltage, improving port safety. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of a detection circuit and relay module for fast charging relay adhesion according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a fourth relay control circuit according to an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures

[0040] R1, first resistor; R2, second resistor

[0041] R3, third resistor; R4, fourth resistor

[0042] R5, fifth resistor; R6, sixth resistor

[0043] R7, the seventh resistor; R8, the eighth resistor.

[0044] R9, Ninth resistor Ks, First switch

[0045] K1, first relay; K2, second relay

[0046] K3, third relay K0, fourth relay

[0047] C1, first capacitor D1, diode

[0048] Q1, Transistor DSP, Digital Signal Processor Detailed Implementation

[0049] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0050] In embodiments of the present invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positional relationships of components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0051] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0052] like Figure 1 The diagram shows a detection circuit and relay module for fast-charging relay adhesion according to an embodiment of the present invention. Figure 1The detection circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third relay K3, a fourth relay K0, and a controller. The fast-charging relays are divided into a first relay K1 connected to the positive terminal of the battery and a second relay K2 connected to the negative terminal of the battery. Specifically, one end of the first resistor R1 is connected to the positive terminal of the battery; one end of the second resistor R2 is connected to the other end of the first resistor R1; one end of the third resistor R3 is connected to one end of the first resistor R1 and one end of the first relay K1; one end of the third relay K3 is connected to the other end of the first relay K1; one end of the fourth resistor R4 is connected to the other end of the third relay K3; one end of the fifth resistor R5 is connected to the other end of the third resistor R3; one end of the sixth resistor R6 is connected to the other end of the fourth resistor R4; the other end of the sixth resistor R6 is connected to the negative terminal of the battery; one end of the seventh resistor R7 is connected to the other end of the fifth resistor R5; the other end of the seventh resistor R7 is connected to one end of the second relay K2; one end of the fourth relay K0 is connected to the other end of the third resistor R3; the other end of the fourth relay K0 is connected to the other end of the fourth resistor R4; one end of the controller is connected to the other end of the first resistor R1; and the other end of the controller is connected to the other end of the fifth resistor R5. This detection circuit can reduce hardware redundancy and save costs. When the fast charging relay sticks, only the sticking busbar of the fast charging port generates voltage to the controller housing, while the unsticking busbar will not generate voltage, thus improving port safety.

[0053] In this embodiment, the controller includes a first switch Ks, an isolation chip, an operational amplifier, and a digital signal processor (DSP). Specifically, the first terminal of the first switch Ks is connected to the other terminal of the first resistor R1, the second terminal of the first switch Ks is connected to the other terminal of the fifth resistor R5, one terminal of the isolation chip is connected to the third terminal of the first switch Ks, the input terminal of the operational amplifier is connected to the other terminal of the isolation chip, and the digital signal processor (DSP) is connected to the output terminal of the operational amplifier.

[0054] On the other hand, the present invention also provides a relay module, which includes a first relay K1, a second relay K2, a third relay K3, a fourth relay K0, and a detection circuit as described above. Specifically, the first relay K1 is connected to the positive terminal of the power supply, and the second relay K2 is connected to the negative terminal of the power supply; one end of the third relay K3 is connected to the other end of the first relay K1, and the other end of the third relay K3 is connected to one end of the fourth resistor R4; one end of the fourth relay K0 is connected to the other end of the fifth resistor R5, and the other end of the fourth relay K0 is connected to the other end of the fourth resistor R4. The relay module also includes a film capacitor, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to the negative terminal of the battery.

[0055] In this embodiment, the relay module also includes a control circuit for a fourth relay K0. Specifically, one end of the fourth relay K0 is connected to a +5V power supply, the collector (C) of transistor Q1 is connected to the other end of the fourth relay K0, the emitter (E) of transistor Q1 is grounded, the cathode of diode D1 is connected to one end of the fourth relay K0, the anode of diode D1 is connected to the other end of the fourth relay K0, one end of an eighth resistor R8 is connected to the base (B) of transistor Q1, the other end of the eighth resistor R8 is connected to a digital signal processor (DSP), and one end of a ninth resistor R9 is connected to one end of the eighth resistor R8, with the other end grounded. The control circuit also includes a first capacitor C1, one end of which is connected to a +5V power supply, and the other end is grounded. In this circuit, transistor Q1 is connected in series with the coil of the fourth relay K0. The isolation chip outputs a signal to control the transistor Q1 to turn on and off, thereby controlling the fourth relay K0 to turn on and off, achieving power amplification. An anti-parallel diode D1 is connected across the coil of the fourth relay K0 to absorb turn-off voltage spikes. Specifically, the control circuit of the fourth relay K0 of the relay module can be as follows: Figure 2 As shown.

[0056] In Figure 1 In the relay module, when the fourth relay K0 is open, regardless of whether the first relay K1 or the second relay K2 is engaged or disengaged, the voltage across the second resistor R2 remains unchanged, which can be defined as V2 = a * V1, where a is the proportionality coefficient, a = R2 / (R1+R2), V1 is the bus voltage, and V2 is the voltage across the second resistor R2. When the fourth relay K0 is engaged, and both the first relay K1 and the second relay K2 are disengaged, the voltage across the second resistor R2 is the same as when the fourth relay K0 is disengaged, V2 = a * V1; when both the first relay K1 and the second relay K2 are engaged, V2 = b * V1, where b is the proportionality coefficient, b = (R2 / / R4) / [(R2 / / R4)+(R1 / / R3)]; when the first relay K1 is engaged, and the second relay K2 is disengaged, the voltage across the second resistor R2 remains unchanged, V2 = a * V1. When K2 is open, V2 = c * V1, where c is the proportional coefficient, c = R2 / [R2 + (R1 / / R3)]; when the first relay K1 is open and the second relay K2 is closed, V2 = d * V1, where d is the proportional coefficient, d = (R2 / / R4) / [(R2 / / R4) + R1]; where a≠b≠c≠d can be achieved by adjusting the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4.

[0057] Through the above technical solution, the present invention provides a detection circuit and relay module for fast charging relay sticking. This detection circuit, by connecting a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor, and then controlling the relay opening and closing via a controller, can detect the voltage in the circuit. This detection circuit reduces hardware redundancy, saves costs, and when the fast charging relay sticks, only the sticking busbar at the fast charging port generates voltage to the controller housing; the unsticking busbar does not generate voltage, improving port safety.

[0058] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. This includes combining various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations. However, these simple modifications and combinations should also be considered as part of the content disclosed in this invention and are all within the protection scope of this invention.

Claims

1. A detection circuit for fast charging relay adhesion, wherein the fast charging relay is divided into a first relay connected to the positive terminal of the battery and a second relay connected to the negative terminal of the battery, characterized in that, The detection circuit includes: The first resistor, one end of which is connected to the positive terminal of the battery; A second resistor, one end of which is connected to the other end of the first resistor; A third resistor, one end of which is connected to one end of the first resistor and one end of the first relay; A third relay, one end of which is connected to the other end of the first relay; A fourth resistor, one end of which is connected to the other end of the third relay; The fifth resistor, one end of which is connected to the other end of the third resistor; A sixth resistor, one end of which is connected to the other end of the fourth resistor, and the other end of which is connected to the negative terminal of the battery; A seventh resistor, one end of which is connected to the other end of the fifth resistor, and the other end of which is connected to one end of the second relay; A fourth relay, one end of which is connected to the other end of the third resistor, and the other end of the fourth relay is connected to the other end of the fourth resistor; A controller, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the other end of the fifth resistor.

2. The detection circuit according to claim 1, characterized in that, The controller includes a first switch, a first end of which is connected to the other end of the first resistor, and a second end of which is connected to the other end of the fifth resistor.

3. The detection circuit according to claim 2, characterized in that, The controller includes an isolation chip, one end of which is connected to the third end of the first switch.

4. The detection circuit according to claim 3, characterized in that, The controller includes an operational amplifier, the input of which is connected to the other end of the isolation chip.

5. The detection circuit according to claim 4, characterized in that, The controller includes a digital signal processor, which is connected to the output of the operational amplifier.

6. A relay module, characterized in that, The relay module includes: The first relay is connected to the positive terminal of the power supply; The second relay is connected to the negative terminal of the power supply; The third relay, one end of which is connected to the other end of the first relay, and the other end of the third relay is connected to one end of the fourth resistor; A fourth relay, one end of which is connected to the other end of the fifth resistor, and the other end of the fourth relay is connected to the other end of the fourth resistor; The relay module further includes a detection circuit as described in any one of claims 1 to 5.

7. The relay module according to claim 6, characterized in that, The relay module also includes: A thin-film capacitor, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to the negative terminal of the battery.

8. The relay module according to claim 7, characterized in that, The relay module also includes: The fourth relay, one end of which is connected to a +5V power supply; The transistor has its collector (C) terminal connected to the other end of the fourth relay, and its emitter (E) terminal grounded. A diode, wherein the negative terminal of the diode is connected to one end of the fourth relay, and the positive terminal of the diode is connected to the other end of the fourth relay; The eighth resistor has one end connected to the base (B) of the transistor and the other end connected to the digital signal processor. The ninth resistor has one end connected to one end of the eighth resistor, and the other end of the ninth resistor is grounded.

9. The relay module according to claim 8, characterized in that, The relay module also includes: The first capacitor has one end connected to a +5V power supply and the other end grounded.

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