Filtering resonance protection circuit
A filter circuit and protection circuit technology, applied in the field of filter resonance protection circuit, can solve problems such as circuit damage, voltage and current rise, and achieve the effect of avoiding resonance.
Inactive Publication Date: 2015-08-12
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
[0002] Existing motherboards often use DC power supply to supply power to the load. In order to provide a more stable DC power supply, a filter circuit composed of capacitors and inductors is often used to filter the DC power supply. However, this filter circuit resonates, and the voltage and current will rise instantaneously. It is easy to cause damage to the circuit
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Embodiment Construction
[0011] Please refer to figure 1 , the filter resonance protection circuit 100 of the present invention is used to prevent a filter circuit 200 from resonating.
[0012] The filter circuit 200 includes a capacitor C1, an inductor L, and a capacitor C2. A power supply 10 is connected to a load circuit 20 through the filter circuit 200 and supplies power to the load circuit 20 . The first end of the power supply 10 is connected to the first end of the capacitor C1, and the second end of the power supply 10 is grounded. The second end of the capacitor C1 is grounded. The inductor L is connected to the first end of the capacitor C2 and the first end of the capacitor C1. The second end of the capacitor C2 is grounded. The first terminal of the capacitor C1 serves as the input terminal Vin of the filter circuit 200 , and the node between the capacitor C2 and the inductor L serves as the output terminal Vout of the filter circuit 200 . The load circuit 20 is connected between the...
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A filtering resonance protection circuit is used to prevent a filtering circuit from generating resonance. The filtering circuit comprises a first capacitor, an inductor and a second capacitor, the first end of the first capacitor is connected with the first end of the second capacitor through the inductor, the second ends of the first and second capacitors are grounded, and a node between the second capacitor and the inductor is an output end of the filtering circuit; the filtering resonance protection circuit comprises a switch element, a third capacitor and a control module, the third capacitor is connected with the output end through the switch element, the control module is connected with the output end and the switch element, and, when the control module detects that the resonance is generated in the filtering circuit, the switch element is controlled to the closed; and when the control module does not detect that the resonance is generated in the filtering circuit, the switch element is controlled to be disconnected. The filtering resonance protection circuit can enable the third capacitor and the second capacitor to be connected in parallel to increase a total capacitance value of the filtering circuit when the resonance is generated in the filtering circuit, and then the resonance frequency of the filtering circuit is reduced, so the resonance is prevented from generation.
Description
technical field [0001] The invention relates to a filter resonance protection circuit. Background technique [0002] Existing motherboards often use DC power supply to supply power to the load. In order to provide a more stable DC power supply, a filter circuit composed of capacitors and inductors is often used to filter the DC power supply. However, this filter circuit resonates, and the voltage and current will rise instantaneously. It is easy to cause damage to the circuit. Contents of the invention [0003] In view of this, it is necessary to provide a filter resonance protection circuit that avoids resonance. [0004] A filter resonance protection circuit, used to prevent a filter circuit from resonating, the filter circuit includes a first capacitor, an inductor and a second capacitor, the first end of the first capacitor is connected to the first end of the second capacitor through the inductor end, the second end of the first capacitor and the second capacitor ar...
Claims
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IPC IPC(8): H02M1/34
CPCH02M1/14
Inventor 叶家铭许卜昇
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD