Electric leakage protection device of new energy automobile charging system

Abstract

The utility model discloses an earth leakage protection device of a new energy automobile charging system, and compared with the prior art, the earth leakage protection device of the new energy automobile charging system has the main design conception that at least one protection resistor which plays a role in loop voltage division is connected in series in a DC + or DC-line of a power battery, and the protection resistor is arranged in a high-voltage distribution box. The resistance value of the protective resistor ranges from 100 kilohms to 2 megohms. Due to the existence of the protection resistor, when any relay in the charging positive and negative relays is adhered, if a user mistakenly touches the charging socket to enable the human body resistor to be connected into a loop, the human body voltage can be effectively ensured to be below the safe voltage at the moment, and the high-voltage electric shock risk and the threat to the human body safety are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile electronic appliances, especially relates to a new energy automobile charging system electric leakage protection device. BACKGROUND

[0002] In the current new energy automobile market, with the progress of technology and the improvement of safety standards, high-voltage electric leakage protection technology has become an important link to protect passengers and vehicle safety, aiming to ensure that the high-voltage system of electric vehicles can work safely and reliably in running or static state, avoid accidents caused by electric leakage, protect passengers from electric shock, and ensure that the vehicle will not cause fire or other safety accidents due to electric leakage.

[0003] At the present stage, if the positive and negative relays of the charging circuit are stuck, the vehicle will cause the charging socket to have high-voltage electricity after high-voltage. If the charging socket in this state is touched by mistake during the use of the vehicle, the human body resistance will form a high-voltage closed loop with the power battery, causing electric shock risk and threatening personal safety. UTILITY MODEL CONTENTS

[0004] In view of the above, the utility model aims to provide a new energy automobile charging system electric leakage protection device to solve the technical problems mentioned above.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a new energy automobile charging system electric leakage protection device, which comprises: at least one protection resistor for dividing voltage in series in the DC+ or DC- line of the power battery, and the protection resistor is arranged in the high-voltage distribution box, and the resistance value of the protection resistor ranges from 100kΩ to 2MΩ.

[0007] In at least one possible implementation, a sampling circuit is arranged in the high-voltage distribution box in the state that the protection resistor is in series in the DC+ line, and the sampling circuit is connected in parallel with the protection resistor.

[0008] In at least one possible implementation, a voltage monitoring circuit is connected in parallel across the protection resistor, the voltage monitoring circuit is associated with the vehicle-mounted electric control system electric signal, and is used for detecting the resistance value attenuation of the protection resistor in real time.

[0009] In at least one possible implementation, the resistance value of the protection resistor is not less than 160kΩ.

[0010] In at least one possible implementation, the protection resistor adopts a metal film resistor or a thick film resistor.

[0011] In at least one possible implementation, the protection resistor is formed by a plurality of resistors connected in series.

[0012] Compared with the prior art, the main design concept of the utility model is that at least one protection resistor which plays a role of loop voltage division is connected in series in the DC+ or DC- line of the power battery, and the protection resistor is arranged in the high-voltage distribution box, and the resistance value of the protection resistor ranges from 100kΩ to 2MΩ. Due to the existence of the protection resistor, when any of the charging positive and negative relays appears the sticking phenomenon, if the user mistakenly touches the charging socket so that the human body resistance is connected to the loop, the personal voltage can be effectively ensured to be below the safe voltage at this time, and the risk of high-voltage electric shock and the threat to personal safety are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be further described below in combination with the drawings, wherein:

[0014] Figure 1 A schematic diagram of the electric leakage protection device of the new energy automobile charging system is provided. DETAILED DESCRIPTION

[0015] The embodiments of the utility model will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be explained as the limitation of the utility model.

[0016] The utility model provides an embodiment of an electric leakage protection device of a new energy automobile charging system, and specifically, as shown in Figure 1 The embodiment includes the following:

[0017] At least one protection resistor R2 which plays a role of loop voltage division is connected in series in the DC+ or DC- line of the power battery, and the protection resistor R2 is arranged in the high-voltage distribution box, and the resistance value of the protection resistor R2 ranges from 100kΩ to 2MΩ, and in some preferable embodiments, a specific temperature coefficient resistor with a resistance of 160kΩ, such as a metal film resistor or a thick film resistor, can be selected to avoid resistance drift.

[0018] In some other embodiments, the protection resistor R2 can adopt a multi-resistor series connection mode to share voltage stress, that is, when a resistance value such as 1MΩ is selected, a plurality of resistors can be connected in series to form the protection resistor R2. For example, four 250kΩ resistors are connected in series.

[0019] More preferably, in the embodiment of the protective resistor R2 in series in the DC+ line, a sampling circuit can be arranged in the high-voltage distribution box and in parallel with the protective resistor R2, so that the protective resistor can play both a protective role and a sampling role. Figure 1 As shown in the reference example, due to the presence of the protective resistor R2, when any of the charging positive and negative relays K1 / K2 has a sticking phenomenon, if a user mistakenly touches the charging socket to make the human body resistance R1 access the circuit, at this time, the personal voltage can be effectively ensured to be below the safe voltage, and the risk of high-voltage electric shock and the threat to personal safety can be avoided.

[0020] Finally, it can be supplemented that preferably, a voltage monitoring circuit can be connected in parallel across the protective resistor R2, the voltage monitoring circuit is associated with the vehicle electrical control system electrical signal, and is used for real-time detection of the resistance value attenuation of the protective resistor, such as triggering an alarm when the resistance value decreases by 20%.

[0021] In summary, compared with the prior art, the main design concept of the utility model is that at least one protective resistor for circuit voltage division is connected in series in the DC+ or DC- line of the power battery, and the protective resistor is arranged in the high-voltage distribution box, and the resistance value of the protective resistor ranges from 100kΩ to 2MΩ. Due to the presence of the protective resistor, when any of the charging positive and negative relays has a sticking phenomenon, if a user mistakenly touches the charging socket to make the human body resistance access the circuit, at this time, the personal voltage can be effectively ensured to be below the safe voltage, and the risk of high-voltage electric shock and the threat to personal safety can be avoided.

[0022] In the embodiment of the utility model, if the expression of the position is mentioned, it is based on the relative concept of the embodiment, and in addition, "at least one" means one or more, and "a plurality of" means two or more than two. The association relationship of the associated object is described, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" and similar expressions mean any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple.

[0023] The above embodiment shown in the drawings details the structure, features and effect of the present application, but the above is only a preferred embodiment of the present application, and it should be noted that the technical features involved in the above embodiment and preferred mode can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from, changing the design idea and technical effect of the present application; therefore, the present application is not limited to the implementation range shown in the drawings, and any change or modification made according to the concept of the present application, or equivalent embodiment with equivalent changes, shall be within the protection scope of the present application.

Claims

1. A leakage protection device for a new energy vehicle charging system, characterized in that, The application relates to a protection resistor for a power battery. The protection resistor is arranged in a high-voltage distribution box.

2. The electric leakage protection device of the new energy vehicle charging system according to claim 1, characterized in that, A voltage monitoring circuit is connected in parallel to the two ends of the protection resistor, and the voltage monitoring circuit is associated with a vehicle-mounted electric control system electric signal and used for detecting the resistance value attenuation of the protection resistor in real time.

3. The electric leakage protection device of new energy vehicle charging system according to claim 1, characterized in that, The resistance value of the protection resistor is not less than 160kOmega.

4. The electric leakage protection device of new energy vehicle charging system according to claim 1, characterized in that, The protection resistor is a metal film resistor or a thick film resistor.

5. The electric leakage protection device of new energy vehicle charging system according to claim 1, characterized in that, The protection resistor is composed of a plurality of resistors connected in series.

6. The electric leakage protection device of the new energy vehicle charging system according to any one of claims 1-5, characterized in that, ​

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