Method for modulating high-efficiency and self-adaptive oscillation frequency of switching power supply

A technology of switching power supply and oscillation frequency, which is applied in the field of high-efficiency adaptive oscillation frequency modulation of switching power supply, which can solve the problems of sudden rise and fall of output voltage, improve conversion efficiency, avoid sudden rise and fall of output voltage, and eliminate mechanical The effect of vibration and the possibility of audio noise

Inactive Publication Date: 2012-05-23
WUXI CHIPOWN MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two technologies have a common and obvious defect, that is, a sudden change in load will cause a sudden rise and fall of the output voltage.

Method used

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  • Method for modulating high-efficiency and self-adaptive oscillation frequency of switching power supply
  • Method for modulating high-efficiency and self-adaptive oscillation frequency of switching power supply
  • Method for modulating high-efficiency and self-adaptive oscillation frequency of switching power supply

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described, figure 1 is the functional block diagram of adaptive oscillation frequency modulation, eao is the input signal terminal, X1 is the high and low clamping circuit, X2 is the level shift circuit, X3 is the voltage-current conversion circuit, F3 and F4 are the controlled current source modules, S2, S3 is a controlled switch, C1 is an oscillator charging and discharging capacitor, X6, X7 are comparators, V1, V2 are reference voltages, X5 is an SR flip-flop, X4 is an inverter, F3, F4, S2, S3, C1, X6, X7, X5, and X4 form an oscillator circuit, and X1, X2, and X3 form an eao modulation circuit. OSC is the output signal terminal.

[0028] The oscillator charge / discharge current reference I1 is modulated by the error amplifier output signal (eao). eao first clamps X1 through the high and low thresholds, so that the output signal Va satisfies Vx<=Va<=Vy, Va th...

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Abstract

The invention discloses a method for modulating high-efficiency and self-adaptive oscillation frequency of a switching power supply. The method is characterized in that the modulation method of the switching power supply is controlled by the magnitude of a load current and can obtain high-efficiency and low-output ripple wave good capability at the same time, and the working frequency of the switching power supply is kept at a set higher switching frequency in the case that the switching power supply is under the steady control state of a high output current or a full load; the working frequency is linearly reduced along with the load current in the manner of positive correlation when the load is reduced; and the working frequency keeps at a set lower switching frequency when the load is further reduced at or below a set lower load current. Therefore, the switching frequency can be linearly reduced by the switching power supply within some range from underloading to noloading, so that the switching efficiency is greatly improved, and the abrupt increase and decrease of the output voltage caused by the abrupt change of the load can be further avoided. Furthermore, a system can be prevented from entering into a voice frequency zone to work by limiting the minimum frequency of the switching power supply, so that the possibility of generating mechanical vibration and voice frequency noise of the system can be eliminated.

Description

[0001] technical field [0002] The invention belongs to the technical field of switching power supplies, and in particular relates to a high-efficiency adaptive oscillation frequency modulation method for switching power supplies, which is a new working mode of switching power supplies and can be used for AC / DC and BUCK type DC / DC switching power supplies middle. Background technique [0003] In modern times where green environmental protection is increasingly valued, especially under the general trend of global warming, related technologies for energy saving and emission reduction have attracted more and more attention from the world. Switching power supply (SMPS), as an efficient power supply technology, is being widely used in various electronic products and equipment, such as medical treatment, communication, transportation, lighting, etc., due to its excellent energy-saving and power-saving characteristics. Not only that, relevant energy-saving technical specificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/14
Inventor 张立新胡旅顺陈健易扬波周飙李海松张韬邹宇彤
Owner WUXI CHIPOWN MICROELECTRONICS
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