WO2021057407A1

WO2021057407A1 - New energy vehicle charging protection device relay on-off detection system and method

Info

Publication number: WO2021057407A1
Application number: PCT/CN2020/112792
Authority: WO
Inventors: 宋小辉; 黄龙强
Original assignee: 深圳市利成科技有限公司
Priority date: 2019-09-27
Filing date: 2020-09-01
Publication date: 2021-04-01
Also published as: CN110514998A

Abstract

A new energy vehicle charging protection device relay on-off detection system and method in the technical field of circuit detection, being based on a dual relay charging device comprising an L-pole relay and an N-pole relay. A first feedback circuit is provided between an input end of the L-pole relay and an output end of the N-pole relay, and a second feedback circuit is provided between an input end of the N-pole relay and an output end of the L-pole relay. By detecting turning on and turning off of the two circuits, the on-off of the two relays can be determined, so that the effects of self-detection of relay failures of the system and the increase of user safety can be achieved.

Description

New energy vehicle charging protection device relay on-off detection system and method

Technical field

The invention relates to the technical field of circuit detection, in particular to a new energy vehicle charging protection device relay on-off detection system and method.

Background technique

As new energy vehicles become more and more popular, the safety requirements for charging guns and charging piles are getting higher and higher. There are two relays in the charging gun box and the control board in the charging pile to control the on and off of the L and N loops respectively.

technical problem

The existing technology only controls the on and off of the relay through the control system, and does not check and verify the actual on and off results of each relay. This not only fails to locate the fault by itself, but even brings certain hidden dangers to the safety of the user. Once the relay fails, if it cannot be connected normally, it cannot be charged normally; if it is stuck and cannot be disconnected, it will bring the user a risk of electric shock.

Technical solutions

The purpose of the present invention is to overcome the shortcomings and defects of the prior art, and provide a new energy vehicle charging protection device relay on-off detection system and method, which can independently detect the on-off results of the two loops of L and N.

The purpose of the present invention is achieved through the following technical solutions: a new energy vehicle charging protection device relay on-off detection system, a double relay charging device including an L pole relay and an N pole relay, and the input terminal of the L pole relay is connected to the N pole. The output terminal of the pole relay is connected to the first feedback circuit, and the output terminal of the L pole relay and the input terminal of the N pole relay are connected to a second feedback circuit.

Specifically, the components in the first feedback circuit include a first diode, a first photocoupler, and a first triode, and the input end of the L-pole relay is electrically connected to the anode of the first diode , The cathode of the first diode is electrically connected to the output terminal of the N-pole relay through the connecting surface of the first photocoupler, and the output surface of the first photocoupler is connected to the base of the first triode Electrically connected, the emitter of the first triode is electrically connected to the MCU.

Specifically, the components in the second feedback circuit include a second diode, a second photocoupler, and a second triode. The input terminal of the N-pole relay is electrically connected to the anode of the second diode. The cathode of the second diode is electrically connected to the output terminal of the L-pole relay through the connecting surface of the second photocoupler, and the output surface of the second photocoupler is connected to the base of the first triode. The electrode is electrically connected, and the emitter of the first triode is electrically connected to the CPU.

Specifically, the collector of the first triode is connected to the base with a bias circuit and is connected to an external voltage at the same time, and the emitter of the first triode is grounded and electrically connected to the MCU at the same time.

Specifically, the collector of the second triode is connected to the base with a bias circuit and is connected to an external voltage at the same time, and the emitter of the second triode is grounded and electrically connected to the MCU at the same time.

Specifically, the first feedback circuit and the second feedback circuit further include a number of protection resistors.

The new energy vehicle charging protection device relay on-off detection method uses the new energy vehicle charging protection device relay on-off detection system to detect the on-off detection of the dual-relay charging device.

Beneficial effect

Compared with the prior art, the present invention includes the following advantages and beneficial effects: (1) The present invention provides a method capable of separately detecting the on-off results of the two loops L and N. In the control board, each relay is designed as a single relay loop, and the on-off of the loop is detected through the photocoupler and the triode. So as to achieve the purpose of detecting whether the relay is on and off well.

(2) Through the present invention, the control system can know exactly whether the relay is on and off properly, so as to improve the self-checking ability of the product and provide users with the greatest safety guarantee. This patented technology is not only suitable for automobile charging protection devices, but also for battery charging protection devices for products such as battery cars, and can also be applied to other protection devices that require dual relays to control energization.

Description of the drawings

Figure 1 is a circuit connection diagram of the present invention.

Embodiments of the present invention

The present invention will be further described in detail below in conjunction with the examples and drawings, but the implementation of the present invention is not limited thereto.

In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "provided with, connected", etc., should be understood in a broad sense; the terms "first, second" are only used for descriptive purposes, It cannot be understood as indicating or implying relative importance.

As shown in Figure 1, the specific implementation process of the present invention is as follows: The present invention relates to a new energy vehicle charging protection device relay on-off detection system in the technical field of circuit detection. It is based on an L pole relay PL1 with a control L pole and a control N pole. The N-pole relay PL2 is the circuit on-off detection system of the dual-relay charging device. In the two relays, the two ends of the L pole relay that controls the L pole are the input terminal L_in and the output terminal L_out; the two ends of the N pole relay that controls the N pole are the input terminal N_in and the output terminal N_out, between L_in and N_out Design the first feedback circuit, and design the second feedback circuit between N_in and L_out. By detecting the on and off of these two loops, the on and off of the two relays can be judged. In order to achieve the system self-detection of relay failures and increase the safety of users.

Specifically, L_in and L_out are set at both ends of the L-pole relay switch, and N_in and N_out are set at both ends of the N-pole relay switch.

The components in the first feedback circuit include a first diode D1, a first photocoupler U1, and a first transistor Q1. The input terminal L_in of the L-pole relay RL1 is electrically connected to the anode of the first diode D1, The cathode of the first diode D1 is electrically connected to the output terminal N_out of the N-pole relay RL2 through the connection surface of the first photocoupler U1, and the output surface of the first photocoupler U1 is electrically connected to the base electrode of the first transistor Q1. Connected, the emitter of the first triode is electrically connected to the MCU.

Specifically, in the first feedback circuit, a protection resistor R1 is connected in series between L_in and N_out, the first transistor Q1 is provided with a bias circuit, an external voltage VDD is added to the collector, and the emitter is connected to the output of the photocoupler U1. The terminal is connected into a ground loop, and at the same time, it is electrically connected with the MCU through the data socket.

The components in the second feedback circuit include a second diode D2, a second photocoupler U2, and a second transistor Q2. The input terminal N_in of the N-pole relay RL2 is electrically connected to the anode of the second diode D2, The cathode of the second diode D2 is electrically connected to the output terminal L_out of the L-pole relay RL1 through the connecting surface of the second photocoupler U2, and the output surface of the second photocoupler U2 is electrically connected to the base electrode of the second transistor Q2. Connected, the emitter of the second transistor Q2 is electrically connected to the CPU.

Specifically, in the first feedback circuit, a protective resistor R4 is connected in series between L_in and N_out, the second transistor Q2 is provided with a bias circuit, an external voltage VDD is added to the collector, and the emitter is connected to the output of the photocoupler U2. The terminal is connected into a ground loop, and at the same time, it is electrically connected to the CPU through the data socket.

Specifically, in order to amplify the signal voltage without distortion, the amplifier composed of transistors must ensure that the emitter junction of the transistor is forward biased and the collector junction is reverse biased, that is, set its operating point. The base, emitter and collector of the transistor are at the required potential VDD through the setting of the external circuit. The value of VDD is obtained by calculation.

Among them, the most common function of the diode is to only allow current to pass in a single direction (called forward bias), and the current is blocked when the current is reversed (called reverse bias). Therefore, the diode can be understood as an electronic version of backstop valve. When the L-pole relay PL1 and the N-pole relay PL2 work normally, the first feedback circuit and the second feedback circuit are energized at the same time, and the MCU or CPU receives the electrical signal, otherwise, it cannot receive the electrical signal.

The triode has a current amplification effect, and its essence is that the triode can control the larger change of the collector current with a small change of the base current. This is the most basic and important characteristic of the triode. In the present invention, the first triode Q1 and the second triode Q2 select PNP type transistors to realize the amplification of the small current input by the base electrode, and the electric signal is transmitted to the MCU or CPU by the emitter electrode.

CPU is the unit of data processing. MCU generally contains CPU, but besides the data processing unit, there are other peripheral modules, such as RAM, ROM, timer counter and various I/O interfaces. That is to say, MCU is A micro control unit that integrates the CPU and other peripheral modules.

The specific implementation of the present invention is to start the dual relay charging device equipped with the detection circuit designed by the present invention. When the L pole relay and the N pole relay can work normally, the first feedback circuit and the second feedback circuit form a loop. A forward current flows through a diode, the light-emitting diode in the first photocoupler emits light and converts it into an electric signal to be transmitted to the first triode, and the emitter of the first triode feeds the electric signal back to the MCU; If a forward current flows through the second diode D2, the light-emitting diode in the second photocoupler U2 emits light and converts it into an electrical signal and transmits it to the second transistor Q2. The emitter of the second transistor Q2 will be electrically connected. The signal is fed back to the CPU. You can get information about the normal operation of the equipment.

When one of the L-pole relay PL1 and the N-pole relay PL2, or neither of them can work normally, the first feedback circuit and the second feedback circuit cannot form a loop, and the feedback circuit connected to the input terminal of the faulty relay fails to pass The forward current of the diode can get the information that the equipment is not operating normally, so that the user can deal with the abnormal situation in time.

The above-mentioned embodiments only express the implementation of the present invention, and the description is more specific and detailed, but it should not be understood as a limitation to the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

The new energy vehicle charging protection device relay on-off detection system is characterized in that: a dual-relay charging device including an L-pole relay and an N-pole relay is connected to the input terminal of the L-pole relay and the output terminal of the N-pole relay. The feedback circuit is connected to the second feedback circuit at the output end of the L pole relay and the input end of the N pole relay.
The new energy vehicle charging protection device relay on-off detection system according to claim 1, wherein the components in the first feedback circuit include a first diode, a first photocoupler, and a first triode Tube, the input end of the L-pole relay is electrically connected to the anode of the first diode, and the cathode of the first diode is electrically connected to the output end of the N-pole relay through the connecting surface of the first photocoupler, so The output surface of the first photocoupler is electrically connected with the base of the first triode, and the emitter of the first triode is electrically connected with the MCU.
The new energy vehicle charging protection device relay on-off detection system according to claim 2, wherein the components in the second feedback circuit include a second diode, a second photocoupler and a second triode Tube, the input end of the N-pole relay is electrically connected to the anode of the second diode, and the cathode of the second diode is electrically connected to the output end of the L-pole relay through the connection surface of the second photocoupler, The output surface of the second photocoupler is electrically connected to the base of the first triode, and the emitter of the first triode is electrically connected to the CPU.
The new energy vehicle charging protection device relay on-off detection system according to claim 3, wherein the collector of the first triode is connected to the base with a bias circuit, and is connected to an external voltage at the same time, The emitter of the first triode is grounded and electrically connected to the MCU at the same time.
The new energy vehicle charging protection device relay on-off detection system according to claim 4, wherein the collector of the second triode is connected to the base with a bias circuit, and is connected to an external voltage at the same time, The emitter of the second triode is grounded and electrically connected to the MCU at the same time.
The new energy vehicle charging protection device relay on-off detection system according to claim 1, wherein the first feedback circuit and the second feedback circuit further comprise a plurality of protection resistors.
The new energy vehicle charging protection device relay on-off detection method is characterized in that any one of the new energy vehicle charging protection device relay on-off detection systems described in claims 1-6 is used to detect the on-off detection of the dual-relay charging device.