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A key switch pre-charge failure protection circuit

A key switch, fail-safe technology, applied in safety/protection circuits, battery disconnect circuits, battery circuit devices, etc., can solve problems such as anti-reverse diode safety hazards

Active Publication Date: 2022-03-01
河南嘉晨智能控制股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the anti-reverse diode short circuit in the existing KSI pre-charging circuit is likely to cause potential safety hazards, the present invention provides a key switch (KSI) pre-charging failure protection circuit, which adds a controllable N-MOS switch tube and corresponding drive circuit

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  • A key switch pre-charge failure protection circuit
  • A key switch pre-charge failure protection circuit
  • A key switch pre-charge failure protection circuit

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Embodiment Construction

[0008] Embodiments of the present invention will be described below through specific examples. The implementations described in the following exemplary embodiments do not represent all implementations related to the technical solutions disclosed in the present invention. Rather, they are merely used to help those skilled in the art understand the essence of the present invention.

[0009] The key switch (KSI) pre-charging failure protection circuit provided by the present invention is as figure 2 As shown, the circuit includes a KSI switch, an anti-reverse diode D1, a charging capacitor, and resistors R1, R2, R7, and R8; one end of the KSI switch is connected to the rechargeable battery pack, and the other end is connected to the anode of the diode D1. The negative pole of the diode D1 is connected to a plate CAP+ of the charging capacitor through parallel resistors R1 and R2, and the resistors R7 and R8 are connected in series between the positive pole of the diode D1 and t...

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Abstract

The invention provides a controller pre-charging failure protection circuit. The circuit adds a controllable N-MOS switch tube and a corresponding drive circuit to the existing vehicle pre-charging circuit. When the MCU detects that the charging of the charging capacitor in the pre-charging circuit is completed, it turns off the N-MOS switch to separate the anti-reverse connection diode and the capacitor in the pre-charging circuit, as the input signal key switch ( The state detection point detection of KSI) is not affected by the capacitor, so as to avoid the safety accident caused by the short circuit of the anti-reverse diode which causes KSI to be clamped by the voltage of the capacitor, and the MCU cannot detect the shutdown signal.

Description

technical field [0001] The invention provides a key switch (KSI) pre-charging failure protection circuit. In particular, the invention relates to the field of failure protection of charging circuits. The technical solution provided by the present invention can separate it from the charging capacitor when the existing on-board pre-charging circuit anti-reverse connection diode short circuit fails, so that the KSI state detection point will not be affected by the charging capacitor, and avoid the short circuit of the anti-reverse connection diode. Safety accidents caused by KSI failure. Background technique [0002] In order to protect the contactor contacts of the electric forklift system, it is necessary to limit the charging current of the electric control bus capacitor. As the market changes, it becomes a trend to integrate the charging circuit into the controller. The key switch (KSI) is used as the power input of the controller and the capacitor. port. The input anti-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/0031
Inventor 李飞姚欣
Owner 河南嘉晨智能控制股份有限公司