A low-power electronic self-recovery fuse electric circuit based on INA 200
A self-recovery fuse and low power consumption technology, which is applied to emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, circuit devices, etc., can solve the problems of high power consumption, increased cost and volume, etc. , to achieve the effect of low power consumption
Active Publication Date: 2018-10-26
浙江众合科技股份有限公司
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Problems solved by technology
Repeatedly, there will be a constant current in the circuit, and there will be a large power consumption. It is necessary to use a power tube with a large power, which increases the cost and volume.
Method used
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[0016] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. ...
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The invention discloses a low-power electronic self-recovery fuse electric circuit based on INA 200. The electric circuit includes an INA 200 chip , an electric current sampling circuit, a logic control circuit, a time-delay electric circuit, a protection period control electric circuit and a power tube used for controlling the load, the INA 200 chip is provided with an amplifier and a comparator,the electric current sampling circuit is used for collecting the electric current, the electric current is converted into the voltage and is inputted to the INA 200 chip, the input voltage is amplified through the amplifier of the INA 200 chip and then is outputted to the time-delay electric circuit, control is performed on turning on or turning off of the power tube by the logic control circuit,and the protection period control electric circuit is used for controlling the size of the protection period and realizing the automatic reset of the electric circuit. The output can be cut under theover-current condition, the electric circuit is recovered after the over-current failure is eliminated, the effects of current spikes in the circuit can be resisted, when the over-current failure cannot be eliminated in the electric circuit all the time, and the protection electric circuit will operate periodically until the failure is eliminated.
Description
technical field [0001] The invention relates to a protection circuit, in particular to a self-resetting fuse circuit. Background technique [0002] In existing over-current protection circuits, resettable fuses or control circuits based on comparators are usually used to implement over-current protection. [0003] The resettable fuse is composed of specially treated polymer resin (Polymer) and conductive particles (Carbon Black) distributed inside. Its principle is a dynamic energy balance. Under normal circumstances, the heat generated by the current in it is far less than the heat dissipated, and the resistance of the self-recovery fuse is very small; when there is an overcurrent or short circuit, the heat generated in the self-recovery fuse is much greater than the heat dissipated, and its temperature Significantly rising, the resistance value becomes larger, so that the current in the loop decreases rapidly, thereby limiting and protecting the circuit. When the fault ...
Claims
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Login to View More IPC IPC(8): H02H3/08H02H3/06H02H9/02
CPCH02H3/066H02H3/08H02H9/02
Inventor 戴胜男张颂姚成泽
Owner 浙江众合科技股份有限公司