Capacitance compensation circuit and capacitance compensator
A capacitance compensation and circuit technology, applied in the field of capacitance compensation circuits and capacitance compensators, can solve the problems of inconsistent grounding impedance of PFC circuits, etc.
Active Publication Date: 2019-12-17
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a capacitance compensation circuit and a capacitance compensator, aiming at solving the technical problem of inconsistency of grounding impedance existing in a PFC circuit connected with a safety capacitor
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[0041] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0042] 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 part of the embodiments of the present invention, not all of them. 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.
[0043] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positi...
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The invention provides a capacitance compensation circuit and a capacitance compensator. The capacitance compensation circuit comprises a first safety capacitor circuit, a second safety capacitor circuit, a comparison circuit and an optocoupler modulation circuit, wherein an input end of the first safety capacitor circuit is connected with a first output end of the comparison circuit, an input endof the second safety capacitor circuit is connected with a second output end of the comparison circuit, an input end of the comparison circuit is connected with an output end of the optocoupler modulation circuit, and an input end of the optocoupler modulation circuit is externally connected with PWM signals. The capacitance compensation circuit is advantaged in that the comparison circuit controls the first safety capacitor circuit and / or the second safety capacitor circuit for accessing the capacitance compensation circuit according to a duty ratio of the PWM signal, capacitance attenuationof the safety capacitors caused by temperature change is compensated to the maximum extent, so consistency of the grounding impedance of a PFC circuit connected with the capacitance compensation circuit is ensured.
Description
technical field [0001] The invention relates to the field of circuit technology, in particular to a capacitance compensation circuit and a capacitance compensator. Background technique [0002] Safety capacitor refers to a safety capacitor that will not cause electric shock or endanger personal safety after the capacitor fails. It is often used in power filters to filter common-mode interference and differential-mode interference. [0003] The capacitance of the safety capacitor varies greatly with temperature. When it is in a low temperature environment, the capacitance of the safety capacitor is large; when it is in a high temperature environment, the capacitance of the safety capacitor is small. Therefore, in different temperature environments, the PFC circuit connected to the safety capacitor will cause inconsistent grounding impedance due to the change of the capacitance value of the safety capacitor, resulting in the PFC circuit connected to the safety capacitor in a l...
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Login to View More IPC IPC(8): H02M1/42
CPCH02M1/42Y02B70/10
Inventor 杨建宁
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD