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Overcurrent detecting device

一种检测装置、过电流的技术，应用在测量装置、电路装置、紧急保护电路装置等方向，能够解决组件尺寸增加等问题，达到减少尺寸、减少尺寸和重量、减少成本的效果

Inactive Publication Date: 2006-07-26
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the size of the component increases

Method used

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Examples

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Embodiment Construction

[0044] Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the structure of a load circuit using an overcurrent detection device according to an embodiment of the present invention.

[0045] As shown in Fig. 1, the load circuit has a series connection circuit including a DC power supply VB, a MOS type FET (T1; a semiconductor switch), and a load 1, and the FET (T1) is turned on or off to control the driving of the load 1 operate.

[0046] DC power supply VB is a battery to be mounted on, for example, a vehicle, and load 1 is a motor for driving power windows or various lamps mounted on the vehicle. In addition, the load circuit includes an IC circuit (integrated circuit) 2 , and the driving operation of the FET ( T1 ) is controlled by the IC circuit 2 .

[0047] The drain of FET (T1) and node P1 (voltage V1) of DC power supply VB are connected to terminal a (second terminal) of IC circuit 2, and the...

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PUM

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Abstract

An overcurrent detecting device for detecting an overcurrent in a load circuit, includes a DC power supply, a load, a semiconductor switch that controls ON / OFF of the load, a driver circuit that outputs a driving signal to the semiconductor switch, a reference voltage generating circuit that generates a reference voltage from the DC power supply, a voltage drop generating circuit that includes a resistor for generating a voltage drop and generates a voltage drop in the resistor for generating a voltage drop, a decision voltage generating circuit that generates, as a decision voltage, a voltage corresponding to a voltage obtained by adding a voltage drop generated when the semiconductor switch is turned ON and a voltage drop generated in the resistor for generating a voltage drop, and a comparing circuit that compares the decision voltage with the reference voltage and outputs a disconnecting command signal of the semiconductor switch to the driver circuit when the decision voltage is greater than the reference voltage.

Description

technical field [0001] The present invention relates to an overcurrent detection device for detecting an overcurrent flowing to a DC circuit using a semiconductor switch, and more particularly, to a device capable of detecting with high accuracy a response to a change (if any) in the on-state resistance of a semiconductor switch. overcurrent technology. Background technique [0002] For example, in a DC circuit equipped with a semiconductor switch such as a FET between a DC power source and a motor or lamp load and used to turn on / off the semiconductor switch to thereby control the driving operation of the load, there is provided An overcurrent detection circuit for detecting an overcurrent such as a short-circuit current when it flows, and for immediately turning off the semiconductor switch to protect the circuit when the overcurrent is detected. [0003] FIG. 3 is a circuit diagram showing the configuration of a load drive circuit in which a related overcurrent detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/00G01R19/165
CPCH03K2217/0027H02H3/087H03K17/0822
Inventor 大岛俊藏
Owner YAZAKI CORP
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