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Frequency controller and switching power supply frequency control method

A frequency controller, voltage control current technology, used in control/regulation systems, DC power input conversion to DC power output, instruments and other directions, can solve problems such as complex structure

Inactive Publication Date: 2013-06-19
SHANGHAI RES INST OF MICROELECTRONICS SHRIME PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The conventional structure needs to use more comparators, so the design requirements of the internal comparators need to be considered during implementation, and the structure is more complicated

Method used

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  • Frequency controller and switching power supply frequency control method
  • Frequency controller and switching power supply frequency control method
  • Frequency controller and switching power supply frequency control method

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Embodiment Construction

[0028] image 3 is a schematic diagram of the logic structure of the present invention, the output V of the frequency control circuit of the present invention EN The signal and the valley detection signal jointly determine the SET terminal signal of the flip-flop. When V EN When the signal output is at a high level, the valley detection signal becomes valid, and the two signals are phased to obtain a SET setting signal, and the trigger output signal GD turns on the power tube.

[0029] Figure 4 It is a schematic diagram of the implementation of the frequency controller variable with the output load of the present invention. According to the different loads carried by the controller, the obtained load feedback voltage VFBCTRL is different. The greater the load, the greater the feedback voltage VFBCTRL. When the load is heavy, that is, the system works in the quasi resonant mode (quasi resonant) with a low frequency and does not require modulation. At this time, the first de...

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Abstract

The invention discloses a novel structure of a frequency controller, and the novel structure can change according to output loads. According to the novel structure, feedback voltage of an output load is converted into a feedback current, the feedback current is mirrored to a circuit where the feedback current is converted into voltage, and the feedback current is used for charging a fixed capacitor together with another fixed current. The time when the voltage of the fixed capacitor reaches a set value is determined according to the charging current, and therefore output signal frequency of a comparator is determined. The output signal frequency of the comparator is used for determining the frequency of a switching power supply system. The novel structure comprises a voltage-controlled current source part which is used for converting the feedback voltage into the feedback current. Meanwhile, the novel structure further comprises the comparator which is used for converting the charging current into voltage and comparing the voltage with fixed reference voltage. The comparator outputs signals to realize modulation of the frequency of the switching power supply system.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to the technical field of improving the efficiency of the switching power supply when the output load changes. Background technique [0002] In recent years, in order to achieve higher efficiency and smaller size, the operating frequency of switching power supplies has been greatly improved. High operating frequency can reduce the size of peripheral inductors and capacitors, thereby reducing the size of the system. However, as the operating frequency increases, the switching loss caused by high frequency cannot be ignored more and more. In order to achieve a higher operating frequency and reduce the impact of switching losses, more and more researches have been done on high-frequency soft-switching technology, and quasi-resonant technology is one of them. Its principle uses parasitic devices to make the current or voltage in the switching transformer change according to the...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 杨丰李高林程玉华
Owner SHANGHAI RES INST OF MICROELECTRONICS SHRIME PEKING UNIV
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