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Standby power supply circuit and standby method

A standby power supply and circuit technology, applied in the direction of high-efficiency power electronic conversion, TV, color TV, etc., can solve the problems of low power supply efficiency and high system cost of the whole machine, and achieve high efficiency and reliability, simple circuit and low cost Effect

Active Publication Date: 2016-02-10
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this standby power supply provides the motherboard with a small power of 0.5W required for standby when the whole machine is in standby; low, high system cost

Method used

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  • Standby power supply circuit and standby method
  • Standby power supply circuit and standby method
  • Standby power supply circuit and standby method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1, such as Figure 4 Shown:

[0036] The LLC switch circuit is composed of an LLC drive circuit, a MOS half-bridge circuit, and an LLC transformer, and is used to convert the input voltage through the LLC transformer into different output voltages according to the pulsating signal. The auxiliary winding is placed in the LLC transformer, Also includes,

[0037] The starting circuit is used to convert the input voltage into the starting voltage of the LLC driving circuit and output it to the LLC driving circuit for starting;

[0038] The zero-crossing detection circuit is used to detect the zero-crossing voltage signal on the auxiliary winding and generate a pulsating signal to the LLC drive circuit to control the opening of the MOS half-bridge circuit;

[0039] The bias voltage circuit is used to deliver the voltage induced by the auxiliary winding as the working voltage to the LLC drive circuit and the PFC drive circuit.

[0040] in,

[0041] The start-up ci...

Embodiment 2

[0050] The LLC switch circuit is composed of an LLC drive circuit, a MOS half-bridge circuit, and an LLC transformer, and is used to convert the input voltage through the LLC transformer into different output voltages according to the pulsating signal. The auxiliary winding is placed in the LLC transformer, Also includes,

[0051] The starting circuit is used to convert the input voltage into the starting voltage of the LLC driving circuit and output it to the LLC driving circuit for starting;

[0052] The zero-crossing detection circuit is used to detect the zero-crossing voltage signal on the auxiliary winding and generate a pulsating signal to the LLC drive circuit to control the opening of the MOS half-bridge circuit;

[0053] The bias voltage circuit is used to deliver the voltage induced by the auxiliary winding as the working voltage to the LLC drive circuit and the PFC drive circuit.

[0054] in,

[0055] The start-up circuit is at least composed of a high resistance...

Embodiment 3

[0064] Such as Figure 5 Shown is a specific circuit diagram of the LLC circuit of the present invention.

[0065] In the figure, N1 is the LLC control chip, V1 and V2 are the LLC control main switch MOS tubes, D1 and D2 are the internal freewheeling diodes of the MOS tubes, T1 is the LLC transformer, and windings 1-3 are the main windings on the primary side. 10-12, 6-8 are its output windings, windings 4-5 are auxiliary windings used to provide the Vcc voltage of PFC (its composition is not shown in the figure) and LLC, and the ZVS pin of the chip is the zero-crossing signal detection pin.

[0066] Startup phase:

[0067] After the AC power is connected, the high-voltage 100-300 (refers to the rectified and filtered power frequency voltage) DC power enters through the HD pin of the chip N1, and charges the Vcc capacitor C4 of the GND pin of the chip through the constant current source inside the chip. When C4 When charging to the start-up voltage of the chip, the chip star...

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PUM

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Abstract

The invention discloses a stand-by power source circuit. The stand-by power source circuit is at least composed of a rectifying filtering circuit, a PFC circuit and a switching converting circuit. The rectifying filtering circuit is used for conducting rectifying and filtering on an input voltage and sending the input voltage to the PFC circuit. The PFC circuit is used for supplying the input voltage to the switching converting circuit. The switching converting circuit is used for converting the input voltage to different needed voltages through a transformer and outputting the voltages according to impulse signals. A voltage generated by an auxiliary coil in the switching converting circuit in an inducing mode is transmitted to the switching converting circuit and a PFC driving circuit as a working voltage so as to enable the switching converting circuit to generate a stand-by voltage or a main working voltage. Due to the fact that the auxiliary coil is additionally arranged in the transformer of the switching converting circuit, the working voltage is provided to the switching converting circuit itself. During working and stand-by processes of a complete machine, a zero-cross detecting circuit is additionally arranged to conduct real-time detecting on the auxiliary coil, obtain zero-cross voltage signals and send the zero-cross voltage signals to the switching converting circuit so that the switching converting circuit can be guaranteed to be in a working state continuously.

Description

technical field [0001] The invention relates to a standby power supply circuit and a standby method. Background technique [0002] The traditional large-size LCD TV power supply, because of the large power of the whole machine (greater than 75W), must use a dedicated PFC control chip to improve the PF value and ensure the harmonic factor. The LLC circuit provides the main board and the LED drive circuit. Voltage. The whole power supply supplies power for the whole machine, and the LLC chip, transformer and peripheral devices form an LLC circuit, which is used to isolate and change the primary power supply for secondary power supply. [0003] At the same time, in order to reduce the standby power consumption (less than 0.5W), a dedicated standby power supply is required. On the one hand, this standby power supply provides the motherboard with a small power of 0.5W required for standby when the whole machine is in standby; on the other hand, it provides bias voltage for PFC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/63H02M3/335H02M1/36
CPCY02B70/10
Inventor 高宽志曲泰元
Owner HISENSE VISUAL TECH CO LTD