CN-224205139-U - Control circuit for reducing standby power consumption of resonance circuit and power factor correction circuit and liquid crystal display television

CN224205139UCN 224205139 UCN224205139 UCN 224205139UCN-224205139-U

Abstract

The utility model discloses a control circuit for reducing standby power consumption of a resonant circuit and a power factor correction circuit and a liquid crystal display television, comprising an LLC resonant circuit, a first integrated circuit and a second integrated circuit, wherein the LLC resonant circuit is connected with a seventh pin of the first integrated circuit through a second capacitor, a fourth capacitor is arranged between a sixth pin and a twelfth pin of the first integrated circuit, and a third pin of the first integrated circuit is connected with the second integrated circuit through a third field effect transistor.

Inventors

LI XIAOBO
DING FENGFENG
LI MINGYANG

Assignees

四川长虹电器股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250429

Claims (7)

1. A control circuit for reducing standby power consumption of a resonant circuit and a power factor correction circuit is characterized by comprising an LLC resonant circuit, a first integrated circuit and a second integrated circuit, wherein the LLC resonant circuit is connected with a seventh pin of the first integrated circuit through a second capacitor, a fourth capacitor is arranged between a sixth pin and a twelfth pin of the first integrated circuit, and a third pin of the first integrated circuit is connected with the second integrated circuit through a third field effect transistor.
2. The control circuit for reducing standby power consumption of a resonant circuit and a power factor correction circuit according to claim 1, wherein the LLC resonant circuit comprises a transformer T, a first field effect transistor and a second field effect transistor, a second pin of the first field effect transistor is connected with an anode of a bus capacitor, a first pin of the first field effect transistor is connected with a fifteenth pin of the first integrated circuit, a third pin of the first field effect transistor is simultaneously connected with the second pin of the second field effect transistor, a fourteenth pin of the first integrated circuit and a fourth pin of the transformer, a first pin of the second field effect transistor is connected with an eleventh pin of the first integrated circuit, a third pin of the second field effect transistor is connected with a cathode of the bus capacitor, and a first capacitor is bridged between the third pin of the transformer and the cathode of the bus capacitor.
3. The control circuit for reducing standby power consumption of the resonant circuit and the power factor correction circuit according to claim 2, wherein a first resistor is connected between the first pin of the first field effect transistor and the fifteenth pin of the first integrated circuit in a bridging manner, and a second resistor is connected between the first pin of the second field effect transistor and the eleventh pin of the first integrated circuit in a bridging manner.
4. The control circuit for reducing standby power consumption of a resonant circuit and a pfc circuit according to claim 1, wherein the first leg of the second capacitor is connected to the third leg of the transformer, the second leg of the second capacitor is connected to the first leg of the third resistor and the first leg of the fourth resistor simultaneously, the second leg of the third resistor is connected to the hot ground, the second leg of the fourth resistor is connected to the seventh leg of the first integrated circuit, and the third capacitor is connected across the seventh leg of the first integrated circuit and the hot ground.
5. The control circuit for reducing standby power consumption of the resonant circuit and the power factor correction circuit according to claim 1, wherein a fifth capacitor is connected between the third pin of the first integrated circuit and the hot ground in a bridging manner, the third pin of the first integrated circuit is connected with the first pin of the fifth resistor, the second pin of the fifth resistor is connected with the first pin of the third field effect transistor, a sixth capacitor is connected between the first pin of the third field effect transistor and the hot ground in a bridging manner, the third pin of the third field effect transistor is connected with the third pin of the second integrated circuit in a bridging manner, the second pin of the third field effect transistor is connected with the hot ground, and a seventh capacitor is connected between the third pin of the second integrated circuit and the hot ground in a bridging manner.
6. The control circuit for reducing standby power consumption of a resonant circuit and a PFC circuit according to any of claims 1-5, wherein the first integrated circuit is an LLC control chip and the second integrated circuit is a PFC control chip.
7. A liquid crystal television comprising the resonance circuit according to any one of claims 1 to 6 and a control circuit for reducing standby power consumption of the power factor correction circuit.

Description

Control circuit for reducing standby power consumption of resonance circuit and power factor correction circuit and liquid crystal display television Technical Field The utility model relates to the technical field of power electronics, in particular to a control circuit for reducing standby power consumption of a resonance circuit and a power factor correction circuit and a liquid crystal display television. Background With the rapid development of the flat-panel television industry, the size of the television is larger, the functions are more and more abundant, the power of the whole machine is also larger and more flat-panel televisions adopt high-power switching power supplies, in particular PFC (power factor correction circuit) +LLC (resonant circuit) framework switching power supplies. However, with the rapid development of the internet of things and smart home, more and more television users choose to put the television in a standby state when the television is not in use, i.e. the alternating current is not disconnected. This usage habit brings convenience to the user and also increases the power consumption of the television in an intangible way. For example, a liquid crystal television with standby power consumption of 5W is standby for 365 days, the power consumption is about 43.8kW.h, the electricity fee cost is obvious, and the energy waste is huge. According to the Chinese energy efficiency standard, the standby power consumption of the flat-panel television produced 1 month and 1 day after 2012 is not higher than 0.5W. In general, a television system reduces standby power consumption by turning off unnecessary peripherals or ports, however, the switching power supply itself has some power consumption under standby conditions. PFC (power factor correction circuit) +llc (resonant circuit) architecture switching power supplies can even exhibit 2-5W of instantaneous power due to their characteristic modes of operation. In order to reduce standby power consumption of the PFC+LLC architecture switching power supply, a method commonly used in the industry adopts a standby signal generated by a main board, and the standby power consumption is realized by further controlling the on/off of a PFC circuit through a control circuit consisting of a switching circuit and a photoelectric coupler, and then the control mode is complex, and a certain material cost is also generated. Therefore, whether there is a better way to reduce the standby power consumption of PFC (power factor correction circuit) +llc (resonant circuit) architecture switching power supplies is a current urgent need to be considered and solved. Disclosure of utility model In order to solve the problems in the prior art, the utility model aims to provide a control circuit for reducing standby power consumption of a resonant circuit and a power factor correction circuit and a liquid crystal television. In order to achieve the purpose, the technical scheme includes that the control circuit for reducing standby power consumption of the resonant circuit and the power factor correction circuit comprises an LLC resonant circuit, a first integrated circuit and a second integrated circuit, wherein the LLC resonant circuit is connected with a seventh pin of the first integrated circuit through a second capacitor, a fourth capacitor is arranged between a sixth pin and a twelfth pin of the first integrated circuit, and a third pin of the first integrated circuit is connected with the second integrated circuit through a third field effect transistor. As a further improvement of the utility model, the LLC resonant circuit comprises a transformer T, a first field effect transistor and a second field effect transistor, wherein the second pin of the first field effect transistor is connected with the positive electrode of the bus capacitor, the first pin of the first field effect transistor is connected with the fifteenth pin of the first integrated circuit, the third pin of the first field effect transistor is simultaneously connected with the second pin of the second field effect transistor, the fourteenth pin of the first integrated circuit and the fourth pin of the transformer, the first pin of the second field effect transistor is connected with the eleventh pin of the first integrated circuit, the third pin of the second field effect transistor is connected with the negative electrode of the bus capacitor, and the first capacitor is bridged between the third pin of the transformer and the negative electrode of the bus capacitor. As a further improvement of the utility model, a first resistor is connected between the first pin of the first field effect transistor and the fifteenth pin of the first integrated circuit in a bridging way, and a second resistor is connected between the first pin of the second field effect transistor and the eleventh pin of the first integrated circuit in a bridging way. As a further improvement of the utility model, the fi