Search

CN-224216859-U - Detection circuit for output loop short circuit of alternating-current charging pile

CN224216859UCN 224216859 UCN224216859 UCN 224216859UCN-224216859-U

Abstract

The utility model discloses a detection circuit for short circuit of an output loop of an alternating current charging pile, which comprises an isolation power supply A and an isolation optocoupler B, wherein the output end of the isolation power supply A is connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a pin I of a relay J1 and one end of a resistor R2, a pin II of the relay J1 is connected with an output live wire L, a pin III of the relay J1 is connected with a signal K1, the other end of the resistor R2 is connected with a pin I of the relay J2 and one end of a resistor R3.

Inventors

  • LIANG LIXIAN
  • YAN HUIMEI

Assignees

  • 广东爱普拉新能源技术股份有限公司

Dates

Publication Date
20260508
Application Date
20250522

Claims (7)

  1. 1. The detection circuit for the short circuit of the output loop of the alternating current charging pile comprises an isolation power supply A and an isolation optocoupler B and is characterized in that the output end of the isolation power supply A is connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the first pin of the relay J1 and one end of a resistor R2, the second pin of the relay J1 is connected with an output live wire L, the third pin of the relay J1 is connected with a signal K1, the other end of the resistor R2 is connected with the first pin of the relay J2 and one end of a resistor R3, the second pin of the relay J2 is connected with an output zero line N, the third pin of the relay J2 is connected with a signal K2, the fourth pin of the relay J2 is connected with the fourth pin of the relay J1, the other end of the resistor R3 is connected with the negative electrode of the diode D2 and one end of the isolation optocoupler B, the second pin of the isolation optocoupler B is connected with one end of the resistor R5, and the third pin of the resistor B is connected with the positive electrode of the diode D2.
  2. 2. The circuit for detecting a short circuit of an output circuit of an AC charging pile according to claim 1, wherein one end of the isolated power supply A is connected with an output U1.
  3. 3. The circuit for detecting a short circuit of an output loop of an AC charging pile according to claim 1, wherein a fourth pin of the relay J2 and a fourth pin of the relay J1 are connected with the output U2.
  4. 4. The circuit for detecting a short circuit of an output circuit of an AC charging pile according to claim 1, wherein the other end of the resistor R5 is connected with an output U3.
  5. 5. The circuit for detecting a short circuit in an output circuit of an AC charging pile according to claim 1, wherein the other end of the resistor R4 is connected to a ground terminal CND 2.
  6. 6. The circuit for detecting a short circuit of an output loop of an AC charging pile according to claim 1, wherein a fourth pin of the isolation optocoupler B is connected with a grounding terminal CND 1.
  7. 7. The circuit for detecting a short circuit of an output loop of an AC charging pile according to claim 1, wherein the second pin of the isolation optocoupler B and one end of the resistor R5 are further connected to an output port OUT.

Description

Detection circuit for output loop short circuit of alternating-current charging pile Technical Field The utility model relates to the technical field of detection circuits of alternating-current charging piles, in particular to a detection circuit for short circuit of an output loop of an alternating-current charging pile. Background Along with the popularization of electric vehicles, an alternating-current charging pile is used as an important charging facility of the electric vehicles, and the safety and the stability of the alternating-current charging pile are very important. In the use process of the alternating-current charging pile, a short-circuit fault can occur in the output loop, and the short-circuit fault can not only lead to the fact that the charging pile can not work normally, but also can cause serious safety accidents such as fire disaster and the like. The existing scheme has the defect that a singlechip ADC sampling port is required to be used for detection. However, resources of the single chip microcomputer are usually very intense, and sometimes a chip with higher cost is used due to the lack of an ADC sampling port, so that the cost is increased. Disclosure of utility model The utility model aims to provide a detection circuit for short circuit of an output loop of an alternating current charging pile, so as to solve the problems in the prior art. The detection circuit comprises an isolation power supply A and an isolation optocoupler B, wherein the output end of the isolation power supply A is connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a first pin of the relay J1 and one end of a resistor R2, a second pin of the relay J1 is connected with an output live wire L, a third pin of the relay J1 is connected with a signal K1, the other end of the resistor R2 is connected with a first pin of the relay J2 and one end of a resistor R3, a second pin of the relay J2 is connected with an output zero line N, a third pin of the relay J2 is connected with a signal K2, a fourth pin of the relay J2 is connected with a fourth pin of the relay J1, the other end of the resistor R3 is connected with a first pin of the diode D2 and one end of the isolation optocoupler B, and the other end of the isolation optocoupler B is connected with a third pin of the resistor B5. Preferably, one end of the isolated power supply A is connected with the output U1. Preferably, the output U2 is connected to the fourth pin of the relay J2 and the fourth pin of the relay J1. Preferably, the other end of the resistor R5 is connected to the output U3. Preferably, the other end of the resistor R4 is connected to the ground terminal CND 2. Preferably, the fourth pin of the isolation optocoupler B is connected to the ground terminal CND 1. Preferably, the second pin of the isolation optocoupler B and one end of the resistor R5 are further connected to the output port OUT. Compared with the prior art, the utility model has the beneficial effects that: According to the utility model, an isolated power supply A and an isolated optocoupler B are adopted, and whether an output live wire and an output zero wire are in short circuit or not is judged through high-low level signals of output voltage of the optocoupler B. Before the energy transmission of the output loop, the relays J1 and J2 are closed through signals K1 and K2, so that the output live wire L and the output zero wire N are connected into the detection circuit. When the output live wire L and the output zero line N are not in short circuit, the resistor between the relays J1 and J2 is not in short circuit, the resistor R2 between the relays J1 and J2 participates in the voltage division of the whole circuit, when the resistor R2 between the relays J1 and J2 is large enough, the current on the input side of the optocoupler B is small and insufficient to enable the output side of the optocoupler B to be conducted, the optocoupler B outputs a high level, and when the output live wire L and the output zero line N are in short circuit, the resistor R2 between the relays J1 and J2 is in short circuit, enough current flows on the optocoupler B, and the optocoupler B outputs a low level. When the detection of whether the output live wire L and the output zero wire N of the output loop are short-circuited is finished, the relays J1 and J2 are disconnected, the whole circuit is not connected into the energy transmission process, interference to a main board is avoided, and safety problems are avoided. Drawings Fig. 1 is a circuit diagram of the present utility model. Detailed Description The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Referring to fig. 1, the utility model provi