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On-state load open circuit detection circuit and method

A technology of open circuit detection and load circuit, which is applied in the direction of measuring electricity, measuring electrical variables, electronic circuit testing, etc., can solve the problems that the load open circuit detection cannot be realized, and achieve the effect of avoiding damage

Active Publication Date: 2020-05-15
西安翔腾微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most power transistors with integrated current mirror function are monopolized by foreign countries, and there are no mature products in China. Relying on domestic products to develop high-side power drive chips cannot realize load open circuit detection

Method used

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  • On-state load open circuit detection circuit and method
  • On-state load open circuit detection circuit and method
  • On-state load open circuit detection circuit and method

Examples

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Embodiment 1

[0048] See figure 2 , figure 2 It is a block diagram of an open-state load open detection circuit provided by an embodiment of the present invention. The open-state load open circuit detection circuit of this embodiment includes a first voltage linear conversion module 101, a second voltage linear conversion module 102, a control module 103, and a switch module 104. The open-state load open circuit detection circuit is used to detect whether the load circuit under test is open when the switch module 104 is in the connected state, and control the switch module 104 to turn off when the load circuit under test is detected to be open, so as to avoid high voltage on subsequent circuits Cause damage.

[0049] The first voltage linear conversion module 101 is connected to the first power supply voltage V high 的input terminal for the first power supply voltage V high Linearly converted into the first low voltage signal; the second voltage linear conversion module 102 is connected to ...

Embodiment 2

[0068] On the basis of the foregoing embodiment, this embodiment provides an open-state load open detection method, which performs open-circuit detection according to the open-state load open detection circuit described in the first embodiment. See Figure 4 , Figure 4 It is a flowchart of an open-circuit detection method for an open load provided by an embodiment of the present invention. The open-circuit detection method of the on-state load includes:

[0069] S1: controlling the switch module connecting the first power supply voltage input terminal and the load voltage input terminal to be in a conducting state;

[0070] Such as image 3 As shown, in this embodiment, the switch module is a first NMOS transistor N1, and the drain of the first NMOS transistor N1 is connected to the first power supply voltage V high The input terminal, the source is connected to the load voltage V in The input terminal of the gate NMOS tube turn-on voltage V on ; During the open circuit detecti...

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Abstract

The invention discloses an on-state load open-circuit detection circuit and an on-state load open-circuit detection method. The circuit comprises a first voltage linear conversion module, a second voltage linear conversion module, a control module and a switch module, and the first voltage linear conversion module is connected with the input end of a first power supply voltage and used for linearly converting the first power supply voltage into a first low-voltage signal; the second voltage linear conversion module is connected with the input end of the load voltage and is used for linearly converting the load voltage into a second low-voltage signal; the control module is used for comparing the first low-voltage signal with the second low-voltage signal and judging on-off of the to-be-tested load circuit according to a comparison result; the switch module provides current for the load circuit to be tested. According to the on-state load open circuit detection circuit and method, on-state load open circuit detection can be achieved, the power tube can be closed in time when an open circuit happens to the load circuit to be detected, and damage to a chip is avoided.

Description

Technical field [0001] The invention belongs to the technical field of detection circuits, and specifically relates to an open-state load open-circuit detection circuit and method. Background technique [0002] The high-side power drive chip is used to provide output current for the power supply of the chip. The internal logic of the chip controls the turning on of the power tube, and the internal power tube of the chip provides current to the ground. In order to understand the working status of the load circuit, it is necessary to detect whether there is an open circuit in the load circuit when the power tube is turned on. When the chip power tube is in the on state and the load causes an open circuit due to operating errors or other reasons, the error state needs to be reported to the logic control circuit, and the power tube is turned off through the logic control circuit. The circuit that realizes this function is an on-state detection circuit. [0003] See figure 1 , figure ...

Claims

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Application Information

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IPC IPC(8): G01R31/28G01R31/54
CPCG01R31/2853
Inventor 郎静朱楠王菁权炜陈智邓广真王林凡
Owner 西安翔腾微电子科技有限公司
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