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Power supply protection circuit and motor drive device provided with same

A power supply protection and circuit technology, which is applied to emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve the problems of reduced reliability and difficulty in miniaturization, and improve reliability performance, reduce the number of parts, and achieve reliability

Active Publication Date: 2012-11-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the conventional method of preventing inrush current as described above is a structure in which a control mechanism such as a microcomputer switches a switch, so it is necessary to control a relay (relay) or the like as a switch via a control wiring. Problems such as reduced reliability due to wiring winding, etc.
In addition, since it is a structure that uses contact and non-contact switches and relays using mechanical contacts, there is a problem of lower reliability due to contact failure and life expectancy compared with non-contact switches using semiconductors, for example.
Furthermore, such mechanical switches and relays have problems such as difficulty in miniaturization compared with semiconductors.

Method used

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  • Power supply protection circuit and motor drive device provided with same
  • Power supply protection circuit and motor drive device provided with same
  • Power supply protection circuit and motor drive device provided with same

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Embodiment approach 1

[0034] figure 1 It is a block diagram of the power protection circuit 10 according to Embodiment 1 of the present invention. Such as figure 1 As shown, the power supply protection circuit 10 is disposed between the DC power supply 50 and the load L. As shown in FIG. The load L is a circuit, an electronic circuit, or the like that operates with electric power supplied from the DC power supply 50 , and will be described as the load L here. When supplying power to such a load L, the DC power is usually directly supplied to the load L from the DC power supply 50 , but in this embodiment, the DC power is supplied to the load L from the DC power supply 50 via the power supply protection circuit 10 . structure. In this embodiment, by employing such a configuration, the power supply protection circuit 10 suppresses a surge current from the DC power supply 50 to the load L side. In addition, when an abnormality such as a short circuit occurs in the load L and an overcurrent flows, ...

Embodiment approach 2

[0066] Figure 8 It is a block diagram of the motor drive device 100 according to Embodiment 2 of the present invention. Such as Figure 8 As shown, the motor drive device 100 includes: the power supply protection circuit 10 described in Embodiment 1; and the inverter 60 for driving the motor 70 . Furthermore, DC power is supplied to the inverter 60 via the power protection circuit 10 . Thus, since the motor drive device 100 has the improved power supply protection circuit 10 with improved reliability, the motor drive device of the present invention can provide a motor drive device capable of improving reliability with a simple structure. Furthermore, of course, instead of the power supply protection circuit 10, the power supply protection circuit 11 or the power supply protection circuit 12 may be used.

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PUM

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Abstract

Disclosed is a power supply protection circuit which is provided with: a current suppressing resistor (Rp) provided between an input terminal (VI) and an output terminal (VO); a transistor (Q1) wherein the source and the drain are connected in parallel to the current suppressing resistor (Rp) as a current suppressing section; and a switch control circuit (20), which applies the voltage of an ground terminal (GND) to the gate (G) of the transistor (Q1) when the voltage of the output terminal (VO) exceeds a predetermined voltage, and applies the voltage of the input terminal (VI) to the gate (G) of the transistor (Q1) when the voltage of the output terminal (VO) is lower than the predetermined voltage. The transistor (Q1) can be turned on and off only by means of simple control by having a P-channel transistor as the transistor (Q1).

Description

technical field [0001] The present invention relates to a power supply protection circuit for protecting a power supply, circuit components connected to the power supply, and the like from overcurrent, and a motor drive device having the same. Background technique [0002] Conventionally, as a method of realizing such a protection function, for example, a technique of suppressing a surge current (inrush current) from a power supply to prevent damage to circuit components has been proposed. The conventional method of suppressing inrush current disclosed in Patent Document 1 is a structure provided with: a main switch electrically connecting the power supply to the load side; and an auxiliary switch connected between the power supply and the load side via a current limiting resistor. switches; a detection mechanism that detects a voltage on the load side; and a control mechanism that controls these switches. Then, when the detection means detects a drop in voltage on the load...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02J1/00H02M3/00
CPCH02J7/0031H02H9/001
Inventor 矶田峰明鸭木丰岸本宪一
Owner PANASONIC CORP