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Load circuit protection device

一种负载电路、保护装置的技术，应用在电路装置、紧急保护电路装置、自动断开的紧急保护装置等方向，能够解决半导体开关错误关断等问题，达到防止错误关断的效果

Active Publication Date: 2011-11-30
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, it causes the problem of wrong turn-off of the semiconductor switch when the inrush current exceeds the threshold current

Method used

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Embodiment Construction

[0043] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. figure 1 is a circuit diagram showing the configuration of a load circuit having a load circuit protection device according to an embodiment of the present invention. Such as figure 1 As shown, the load circuit 1 is, for example, a circuit for controlling the driving of loads 12 a to 12 c such as lamps and motors mounted on vehicles. In the load circuit 1, a semiconductor switch 11 such as a MOSFET is provided between the battery (DC power supply) VB mounted on the vehicle and the respective loads 12a to 12c, thereby controlling by controlling the on / off operation of the semiconductor switch 11. Driving and stopping of each load 12a to 12c. Furthermore, since the switches 13a, 13b are provided on the upstream side of the loads 12a, 12b, respectively, driving and stopping of the respective loads 12a and 12b can be operated independently.

[0044] A voltmeter 14 (voltag...

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PUM

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Abstract

Provided is a load circuit protection device, which discriminates an inrush current, which is generated when a semiconductor switch or a switch provided in the downstream of the semiconductor switch is turned on, and an excess current generated in a load from each other, and protects a load circuit by turning off the semiconductor switch only when the excess current is generated. A detection current (I1) detected by an ammeter (15) and a preset threshold current (Iref) are compared with each other by means of a comparator (CMP1), and in the case where the detection current (I1) reaches the threshold current (Iref), the semiconductor switch (11) is turned off and the load circuit is protected. Furthermore, a voltage (Vd) in a cable connecting a battery (VB) and the semiconductor switch (11) is measured, and in the case where a counter-electromotive force is generated and the voltage (Vd) is reduced, the threshold current (Iref) is reduced. Therefore, when a dead short-circuit is generated, the detection current (I1) quickly reaches the threshold current (Iref) and turns off the semiconductor switch (11), and when the inrush current is generated, since the detection current (I1) does not reach the threshold current, erroneous interruption is prevented from being generated.

Description

technical field [0001] The present invention relates to a load circuit protection device that protects a load circuit that controls driving and stopping of a load by using a semiconductor switch provided between a DC power supply and a load from overcurrent. Background technique [0002] For example, driving and stopping of a load such as a power window drive motor or a lamp to be mounted on a vehicle is controlled by regulating a DC voltage from a battery by on and off operations of a semiconductor switch such as a MOSFET. [0003] In such a load circuit, in order to protect the load circuit when an overcurrent occurs, a threshold current is set in advance and a protection device that turns off a semiconductor switch when the current exceeds the threshold current is provided. Furthermore, when the inrush current generated immediately after the semiconductor switch is turned on reaches a threshold current, the semiconductor switch may be turned off by mistake. Thus, for exa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087
CPCH02H3/087H02H1/04
Inventor 上田圭祐丸山晃则中村吉秀
Owner YAZAKI CORP
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