Over-current protection circuit

An overcurrent protection circuit and circuit technology, applied in electrical components, output power conversion devices, etc., can solve the problems of low reliability of overcurrent protection circuits and overcurrent damage of PFC devices.

Active Publication Date: 2018-05-01
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If there is a short circuit in the strong current circuit, the current in the circuit increases, and the chip fails to protect in time, which may cause overcurrent damag...

Method used

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Embodiment Construction

[0022] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses an over-current protection circuit. The over-current protection circuit comprises at least one electrical parameter sampling circuit used for taking samples of at least one electrical parameter of a target circuit; at least one comparison circuit which is connected with the at least one electrical parameter sampling circuit in a one-to-one correspondence manner, wherein each comparison circuit is used for comparing a sampling result of a corresponding electrical parameter sampling circuit with a corresponding preset electrical parameter threshold value and outputting acomparison result; a normally open switching circuit which is enabled by an output terminal of the at least one comparison circuit and is used for conducting or breaking connection between a power supply and a power supply input terminal of a target circuit; a normally closed switching circuit used for conducting or breaking connection between the power supply and the power supply input terminal of the target circuit; and a positive temperature coefficient temperature-sensitive PTC resistor connected in series with the normally closed switching circuit. According to the invention, the technical problem that the over-current protection circuit in the prior art is relatively low in reliability is solved.

Description

technical field [0001] The invention relates to the field of protection circuits, in particular to an overcurrent protection circuit. Background technique [0002] The overcurrent protection circuit is used to protect the target circuit when the protected target circuit has an overcurrent phenomenon. For the current inverter air conditioner or other inverter high-power equipment, Power Factor Correction (PFC) technology is used to improve the power supply. Efficiency, when performing overcurrent protection on the PFC circuit, the following processing methods are generally adopted: use the sampling resistor to sample the current, convert it into a voltage signal, and amplify it through the amplifier (for example, patent 201010620626.4); through the analog-to-digital conversion of the main control chip After sampling, the Analog to Digital Converter (ADC for short) judges whether there is an overcurrent and then takes protective measures or compares the converted voltage compa...

Claims

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Application Information

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IPC IPC(8): H02M1/32
CPCH02M1/32H02M1/325
Inventor 韩若谷杜香玲杨波
Owner GREE ELECTRIC APPLIANCES INC
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