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Frequency controller for power converter and related frequency control method

A technology of power converters and frequency controllers, applied in frequency controllers, frequency controllers and related frequency control fields

Active Publication Date: 2019-02-26
LEADTREND TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Frequency controller for power converter and related frequency control method
  • Frequency controller for power converter and related frequency control method
  • Frequency controller for power converter and related frequency control method

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Embodiment Construction

[0056] Please refer to figure 1 , figure 1 It is a schematic diagram of a frequency controller 200 applied to a power converter 100 according to the first embodiment of the present invention. Such as figure 1 As shown, the frequency controller 200 includes a valley signal generation unit 202, a valley selection module 204, a gate signal generation unit 206, an auxiliary pin 208, a compensation pin 210, a gate pin 212 and a current Detect pin 214 . Such as figure 1 As shown, the valley signal generation unit 202 is used to generate a valley signal QRD corresponding to the voltage VD according to the voltage VD received by the auxiliary pin 208 and a reference voltage VREF, wherein the voltage VD is related to the primary voltage of the power converter 100 The auxiliary winding AUX of the side PRI is generated by the voltage divider circuit 102 coupled to the auxiliary winding AUX. Such as figure 1 As shown, the valley selection module 204 includes a reference frequency up...

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Abstract

The present invention discloses a frequency controller of a power supply converter and a relevant frequency control method of the power supply converter. The frequency controller comprises a trough signal generation unit, a trough selection module and a grid signal generation unit. The trough signal generation unit generates a trough signal corresponding to a voltage according to the voltage and a reference voltage, the trough selection module generates a trough selection signal according to a grid control signal, a compensation voltage and the trough signal, and the grid signal generation unit generates a grid control signal according to the trough signal, the trough selection signal, the compensation voltage and a detection voltage. The frequency of the grid control signal changes along with a trough corresponding to the voltage in each cycle of the grid control signal and the load at the secondary side of the power supply converter, and is between a reference frequency upper limit and a reference frequency lower limit, so that the problem that the power converter generates the noise at light load, can be solved.

Description

technical field [0001] The present invention relates to a frequency controller of a power converter and its related frequency control method, in particular to a method of using a valley selection signal to gradually adjust the frequency of the gate control signal to be between the upper limit of the reference frequency and the lower limit of the reference frequency The frequency controller and its related frequency control method. Background technique [0002] When the power converter is under light load, the frequency controller disclosed in the prior art uses a delay element to insert a blanking time to reduce the frequency of the gate control signal of the power converter, that is to say, to reduce the frequency of the power converter. Switching losses at light loads where the blanking time can vary with the load on the secondary side of the power converter. The above method of inserting a blanking time to reduce the frequency of the gate control signal of the power conv...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
Inventor 黄俊胜邹明璋
Owner LEADTREND TECH