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CN-224218563-U - Connection control circuit of isolation ground and ground

CN224218563UCN 224218563 UCN224218563 UCN 224218563UCN-224218563-U

Abstract

The application discloses a connection control circuit of an isolated ground and the ground, which relates to the technical field of power electronics and can solve the problems that the connection mode between the isolated ground and the ground is fixed and uncontrollable and is easy to cause static accumulation, electromagnetic interference (EM I), leakage current risk and potential safety hazard. According to the application, the connection state between the isolation ground and the ground can be flexibly controlled according to actual requirements, so that on the premise of ensuring the safety of equipment, the risks of static accumulation, electromagnetic interference and the like are reduced, and the running reliability and safety of the equipment are improved.

Inventors

  • TAO SHAOHUA

Assignees

  • 惠州亿纬锂能股份有限公司

Dates

Publication Date
20260508
Application Date
20250604

Claims (11)

  1. 1. A connection control circuit isolated from ground, comprising: The switch module is connected between the isolation ground and the ground and used for controlling the communication state between the isolation ground and the ground; And the control module is connected with the switch module and is used for controlling the switch state of the switch module based on an input selection signal so that the isolated ground and the ground are in a communication state corresponding to the selection signal.
  2. 2. The isolated ground to ground connection control circuit of claim 1, wherein the switch module comprises a first switch and a second switch, wherein: a first end of the first switch is connected with the isolation ground; The first end of the second switch is connected with the ground; the second end of the first switch is connected with the second end of the second switch.
  3. 3. The isolated ground to ground connection control circuit of claim 2, wherein the first switch is a first relay switch and the second switch is a second relay switch; the first relay switch and the second relay switch are simultaneously controlled by a relay coil.
  4. 4. The isolated ground to ground connection control circuit of claim 2, further comprising an electrostatic protection module, wherein: The static protection module is connected in series between the second end of the first switch and the second end of the second switch and is used for preventing static accumulation.
  5. 5. The ground-to-ground connection control circuit of claim 4, wherein the electrostatic protection module comprises an electrostatic protection resistor and an electrostatic protection capacitor in parallel with the electrostatic protection resistor.
  6. 6. A connection control circuit to ground isolated according to claim 3, wherein the control module comprises a third switch, wherein: The third switch and the relay coil are connected in series between the positive pole and the negative pole of the power supply.
  7. 7. The isolated ground to ground connection control circuit of claim 6, wherein the third switch is an NMOS transistor, the control module further comprising a voltage divider resistor and a pull-down resistor, wherein: The grid electrode of the NMOS tube is connected with a first level signal through the voltage dividing resistor; and the grid electrode of the NMOS tube is also connected with the negative electrode of the power supply through the pull-down resistor.
  8. 8. The isolated ground to ground connection control circuit of claim 6, wherein the third switch is a PMOS transistor, the control module further comprising a pull-up resistor, wherein: The grid electrode of the PMOS tube is connected with a second level signal; and the grid electrode of the PMOS tube is connected with the positive electrode of the power supply through the pull-up resistor.
  9. 9. The isolated ground to ground connection control circuit of claim 6, wherein the control module further comprises at least one filter capacitor, wherein: and two ends of the filter capacitor are respectively connected with the positive electrode and the negative electrode of the power supply.
  10. 10. The isolated ground to ground connection control circuit of claim 6, wherein the control module further comprises a breakdown preventing member connected in parallel with the relay coil for preventing current from breaking through the third switch.
  11. 11. The ground-to-ground connection control circuit of claim 10, wherein the breakdown preventing member is a high-speed switching diode, an anode of the high-speed switching diode is connected to a first end of the relay coil, and a cathode of the high-speed switching diode is connected to a second end of the relay coil; The first end of the relay coil is connected with the negative electrode of the power supply through the third switch, and the second end of the relay coil is connected with the positive electrode of the power supply, or the first end of the relay coil is connected with the negative electrode of the power supply, and the second end of the relay coil is connected with the positive electrode of the power supply through the third switch.

Description

Connection control circuit of isolation ground and ground Technical Field The application relates to the technical field of power electronic systems, in particular to a connection control circuit for isolating ground and earth. Background In the fields of electronic devices, industrial control systems, communication devices, test measurement devices, etc., there are generally involved problems of connection between an isolated ground (also called floating ground) inside the device and an external ground (grounding system). Isolation grounds are typically used to achieve electrical isolation to avoid external interference, electromagnetic interference, or the effects of ground loops. However, while isolated, it can improve the tamper resistance and safety of the device, it can also result in static charge build up in the isolated, or in some special cases, require selective connection to ground to release static electricity or suppress potential differences, thereby avoiding electrical safety hazards or device damage. In the prior art, the connection between the isolation ground and the ground is usually a fixed hard connection or a manually operated mechanical switch connection. However, the existing connection mode lacks flexibility, cannot be controlled automatically, is easy to cause ground loop interference, cannot effectively release static electricity accumulation, has the risk of manual misoperation and the like, and reduces the anti-interference performance and the safety of equipment. The above information disclosed in this background section is only included to enhance understanding of the background of the disclosure and therefore may contain information that does not form the prior art that is presently known to those of ordinary skill in the art. Disclosure of utility model The application provides a connection control circuit for an isolated ground and the ground, which aims to solve the problems that the connection mode between the isolated ground and the ground is fixed and uncontrollable, and static accumulation, electromagnetic interference, leakage current risk and potential safety hazard are easily caused. The application adopts the following technical scheme: In a first aspect, the present application provides a connection control circuit isolated from ground, the circuit comprising: the switch module is connected between the isolation ground and the ground and used for controlling the communication state between the isolation ground and the ground; And the control module is connected with the switch module and is used for controlling the switch state of the switch module based on the input selection signal so that the isolation ground and the ground are in a communication state corresponding to the selection signal. According to the application, the switch module and the control module are arranged, so that the flexible control of the connection state between the isolation ground and the ground is realized, the connection or disconnection state between the isolation ground and the ground can be dynamically regulated based on the input selection signal according to actual requirements or system working conditions, the flexibility and the reliability of the connection control of the isolation ground are improved, and the automatic management and the intelligent control are conveniently realized. As one possible implementation, the switch module includes a first switch and a second switch, wherein: The first end of the first switch is connected with the isolation ground; the first end of the second switch is connected with the ground; the second end of the first switch is connected with the second end of the second switch. According to the application, the two switches are flexibly switched to be connected with the ground in an isolated manner, so that potential conflict and electromagnetic interference are effectively reduced, and the safety, reliability and electromagnetic compatibility of the system are improved. As one possible implementation, the first switch is a first relay switch, and the second switch is a second relay switch; the first relay switch and the second relay switch are simultaneously controlled by the relay coil. According to the application, the first switch and the second switch are respectively realized as the first relay switch and the second relay switch, and the two relay switches are simultaneously controlled by the same relay coil, so that the consistency and the synchronism of the switching actions can be realized. When the relay coil is controlled to act, the first relay switch and the second relay switch can be simultaneously opened or closed, so that a definite connection or disconnection state is formed between the isolation ground and the ground, connection state uncertainty possibly caused by delay or asynchronization of switch action is effectively avoided, reliability of system control is improved, and misoperation risk is reduced. As a possible imple