Electronic relay
By designing an electronic relay using insulated gate bipolar transistors and optocouplers, the problem of short service life of mechanical relays in electric vehicles is solved, and a relay with high reliability and long life is achieved. It is suitable for DC pre-pre-sales of electric vehicles Charging system.
Patent Information
- Application Number
- CN202421168491.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The mechanical relays used in electric vehicles have problems such as short service life, high cost and complex process.
An electronic relay is designed, using an insulated gate bipolar transistor for switching, and an optocoupler is set up before the drive terminal circuit and the IGBT input to achieve optocoupling isolation, reaching a 1000VDC withstand voltage.
It achieves a lifespan of millions at 1000VDC, significantly improving the service time of the relay in the DC pre-charging system of electric vehicles, and has the advantages of high reliability, no contacts, long life and fast speed.
Smart Images
Figure CN222509283U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric control elements, in particular to an electronic relay. Background Art
[0002] A relay is an electrical control device that can give a specified input and maintain it for a long enough time, causing a predetermined step change in the controlled quantity in the electrical output circuit. When the input drops to a certain level and remains for a long enough time, it returns to its initial state.
[0003] Nowadays, mechanical relays are often used in electric vehicles to control on and off. Electric vehicles use mechanical contactors, which cause severe voltage arcing and shorten their lifespan. In addition, mechanical relays also have the problems of high cost and complex process.
[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content
[0005] In order to overcome the defects of the prior art, an electronic relay is now provided to solve the problem that the mechanical relays used in electric vehicles have a short service life.
[0006] To achieve the above object, an electronic relay is provided, comprising:
[0007] A protection module, comprising a first resistor, a second resistor, a third resistor, a capacitor and a triode, wherein the protection module is connected to a low-voltage input power supply through a positive input pin and a negative input pin, one side connection end of the third resistor is connected to the positive input pin, one side connection end of the second resistor is connected to the negative input pin, the first resistor is connected in series with the triode and then connected in parallel with the capacitor, one side connection end of the first resistor and the capacitor is connected to the other side connection end of the third resistor, the other side connection end of the capacitor is connected to one side connection end of the second resistor, and the collector of the triode is connected to the other side connection end of the second resistor;
[0008] An optical coupler, wherein a first pin of the optical coupler is connected to the other connecting end of the third resistor, and a third pin of the optical coupler is connected to the base of the transistor;
[0009] An insulated gate bipolar transistor, wherein the gate of the insulated gate bipolar transistor is connected to the sixth pin of the optocoupler, the emitter of the insulated gate bipolar transistor is connected to the fourth pin of the optocoupler, the emitter of the insulated gate bipolar transistor is connected to the positive output pin, and the collector of the insulated gate bipolar transistor is connected to the negative output pin.
[0010] Furthermore, the transistor is an NPN transistor.
[0011] Furthermore, the capacitor is an electrolytic capacitor.
[0012] The beneficial effect of the utility model is that the electronic relay of the utility model switches through an insulated gate bipolar transistor, and an optical coupler is arranged between the driving end circuit and the IGBT input end for optical coupling isolation, thereby achieving a 1000VDC withstand voltage of 3500V. The electronic relay of the utility model can have a service life of millions of times at 1000VDC, greatly improving the limited service life of the original mechanical relay of the DC pre-charging system of electric vehicles.
[0013] The electronic relay of the utility model can achieve the function of connecting and disconnecting without contact and spark. Compared with mechanical relays, it has the advantages of high reliability, no contact, long life, fast speed, and little interference to the outside world. The input end of the electronic relay of the utility model can directly drive a large current load with a tiny control signal. The optical coupler of the electronic relay of the utility model has the advantages of sensitive action, high response speed, and high insulation level between the input / output ends. The electronic relay of the utility model has no mechanical parts inside and has the advantages of vibration resistance, corrosion resistance, long life and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0015] Figure 1 The figure is a circuit diagram of an electronic relay according to an embodiment of the present utility model. DETAILED DESCRIPTION
[0016] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.
[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0018] Reference Figure 1 As shown, the utility model provides an electronic relay, including: a protection module, an optical coupler U2 and an insulated gate bipolar transistor U1.
[0019] Specifically, the protection module includes a first resistor R1, a second resistor R2, a third resistor R3, a capacitor C1 and a transistor Q1.
[0020] Specifically, the protection module is connected to a low-voltage input power source (or a power supply low-voltage power source) through a positive input pin and a negative input pin.
[0021] One side connection end of the third resistor is connected to the positive input pin. One side connection end of the second resistor is connected to the negative input pin. The first resistor is connected in series with the transistor and then connected in parallel with the capacitor. One side connection end of the first resistor and the capacitor is connected to the other side connection end of the third resistor. The other side connection end of the capacitor is connected to one side connection end of the second resistor. The collector of the transistor is connected to the other side connection end of the second resistor.
[0022] As a preferred implementation, the transistor is an NPN transistor.
[0023] As a preferred implementation, the capacitor is an electrolytic capacitor.
[0024] The first pin of the optical coupler U2 is connected to the other connecting end of the third resistor, and the third pin of the optical coupler is connected to the base of the transistor.
[0025] The gate of the insulated gate bipolar transistor U1 is connected to the sixth pin of the optocoupler. The emitter of the insulated gate bipolar transistor is connected to the fourth pin of the optocoupler. The emitter of the insulated gate bipolar transistor is connected to the positive output pin. The collector of the insulated gate bipolar transistor is connected to the negative output pin.
[0026] The electronic relay of the utility model switches through an insulated gate bipolar transistor, and an optical coupler is arranged between a driving end circuit and an input end of the insulated gate bipolar transistor to perform optical coupling isolation, thereby achieving a 1000VDC withstand voltage of 3500V.
[0027] The positive input pin and the negative input pin are connected to VDD and GND respectively. VDD and GND are low voltage power supplies. HV± is the load end, that is, the high voltage part, which is generally followed by a capacitor to charge the capacitor, and the voltage can be allowed to be 1000VDC. The electronic relay of the utility model can have a service life of millions of times under 1000VDC, which greatly improves the limited service life of the original mechanical relay of the DC pre-charging system of electric vehicles.
[0028] The electronic relay of the utility model can achieve the function of connecting and disconnecting without contact and spark. Compared with mechanical relays, it has the advantages of high reliability, no contact, long life, fast speed, and little interference to the outside world. The input end of the electronic relay of the utility model can directly drive a large current load with a tiny control signal. The optical coupler of the electronic relay of the utility model has the advantages of sensitive action, high response speed, and high insulation level between the input / output ends. The electronic relay of the utility model has no mechanical parts inside and has the advantages of vibration resistance, corrosion resistance, long life and high reliability.
[0029] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.
Claims
1. An electronic relay, characterized in that: include: A protection module, comprising a first resistor, a second resistor, a third resistor, a capacitor and a triode, wherein the protection module is connected to a low-voltage input power supply through a positive input pin and a negative input pin, one side connection end of the third resistor is connected to the positive input pin, one side connection end of the second resistor is connected to the negative input pin, the first resistor is connected in series with the triode and then connected in parallel with the capacitor, one side connection end of the first resistor and the capacitor is connected to the other side connection end of the third resistor, the other side connection end of the capacitor is connected to one side connection end of the second resistor, and the collector of the triode is connected to the other side connection end of the second resistor; An optical coupler, wherein a first pin of the optical coupler is connected to the other connecting end of the third resistor, and a third pin of the optical coupler is connected to the base of the transistor; An insulated gate bipolar transistor, wherein the gate of the insulated gate bipolar transistor is connected to the sixth pin of the optocoupler, the emitter of the insulated gate bipolar transistor is connected to the fourth pin of the optocoupler, the emitter of the insulated gate bipolar transistor is connected to the positive output pin, and the collector of the insulated gate bipolar transistor is connected to the negative output pin.
2. The electronic relay according to claim 1, characterized in that: The transistor is an NPN transistor.
3. The electronic relay according to claim 1, characterized in that: The capacitor is an electrolytic capacitor.