Power supply circuit with PFC inductance and TV set comprising said power supply circuit

A technology for power supply circuits and TV sets, which is applied to TVs, color TVs, components of color TVs, etc., can solve the problems of startup noise and poor system reliability, and achieves the advantages of eliminating startup noise, wide application fields, and avoiding the use of relays. Effect

Active Publication Date: 2006-02-08
HISENSE +1
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Problems solved by technology

[0003] In order to solve the problem of starting noise and poor system reliability when the main control power supply controls other power supplies in the prior art by using a relay, the present invention provides a new type of power supply circuit with an active PFC inductor, through The simple circuit structure realizes the effective control of the main control power supply to other power supplies without using relays, which not only eliminates the starting noise, but also reduces the production cost and improves the reliability of the product

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  • Power supply circuit with PFC inductance and TV set comprising said power supply circuit

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Embodiment Construction

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] figure 1 Among them, TI is a PFC energy storage inductor, one end is connected to the AC power supply through the rectifier bridge, and the other end is connected to the post-stage circuit, and there is usually no secondary winding. Even though secondary windings are added in some circuits with PFC inductors, it is mainly for sampling, e.g. figure 1 The sampling circuit composed of T-1 winding and resistors R1, R2 and capacitor C1. In order to realize the functions to be accomplished by the present invention, a secondary winding T-2 is added on the secondary side of the PFC inductor T1. One end of the secondary winding T-2 is directly connected to the T-1 winding on the one hand, and connected to the T-1 winding through the series resistors R1, R2 and capacitor C1 on the other hand; the other end of the secondary winding T-2 ...

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Abstract

The invention discloses a power circuit with PFC inductor and a television with the circuit, which comprises: adding secondary winding to the inductor and matching with corresponding control circuit to drive the power supply end of secondary power chip, setting its current protection end and controlling the power chip to cut off automatically. The invention has the advantages of realizing a plurality of power supplies work in one system simultaneously, of avoiding using relay with one power supply working as main control power supply.

Description

technical field [0001] The invention relates to an improvement of a power supply circuit, in particular to an improvement of a power supply circuit with an active power factor correction PFC inductor. Background technique [0002] In the existing power supply circuit system, when multiple power supplies coexist, there must be a problem that the main control power supply needs to control other power supplies. The usual method is to add a relay to cut off the high voltage input, so as to realize the forced stop of other power supplies. The use of this circuit structure results in high cost, and secondly, there will be a sound when the relay is started. Moreover, if a relay has been added to the standby circuit to control other circuits, there will be two relays in one power system. The situation not only increases the noise when starting, but also reduces the reliability of the system, which is not conducive to the wide promotion and application of products. Therefore, how to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14H04N5/63
Inventor 辛晓光刘广学
Owner HISENSE
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