Switch power supply
A technology of switching power supply and switching frequency, which is applied in the direction of electrical components, adjusting electrical variables, instruments, etc., can solve the problems of improving load capacity and improving conversion efficiency, and achieve the effect of improving conversion efficiency and low device conduction loss
Active Publication Date: 2014-01-08
ACTIONS ZHUHAI TECH CO
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[0010] The purpose of the embodiments of the present invention is to provide a switching power supply, aiming to solve the problem that the existing switching power supply cannot balance the load capacity and the conversion efficiency in the PFM mode
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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0061] Figure 4 The structure of the switching power supply provided by the first embodiment of the present invention is shown, and for the convenience of description, only the parts related to the present invention are shown.
[0062] Switching power supplies include:
[0063] Power conversion module 101 and switching frequency generator 201;
[0064] The power conversion module 101 includes an inductor, and the current flowing through the inductor is an inductor current;
[0065] The switching frequency generator 201 is used to provide the switching frequency signal required by the power conv...
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The invention is applied to the field of power supply converters and provides a switch power supply. In the embodiment of the invention, the switch power supply is provided with a switch frequency generator and a power supply conversion module, wherein the switch frequency generator is used for receiving a dead zone inlet signal output by the power supply conversion module and transmitting a switch frequency signal to the power supply conversion module, so that the period is ended after inductive current of the switch power supply enters the dead zone time and next period is started, further the inductive current nearly works in a critical conducting mode and the load capacity of the switch power supply in an interrupted mode of PFM (Pulse Frequency Modulation) is improved. In another embodiment of the invention, the switch power supply is provided with a load current detection module and an inductive peak current controller, wherein the inductive peak current controller is used for transmitting a peak current control signal to the power supply conversion module according to a detection result fed back by the load current detection module, so that inductive peak current of the switch power supply changes along with the change of the load current and the conversion efficiency of the switch power supply is improved.
Description
technical field [0001] The invention belongs to the field of power converters, in particular to a switching power supply. Background technique [0002] There are three main control techniques for switching power supplies: Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM) and Pulse Width Frequency Modulation (PWM-PFM). [0003] In the PFM modulation technology, the modulation signal changes with the amplitude of the input signal, that is, the modulation signal is a pulse signal with variable frequency, and the stable output voltage is controlled by the presence or absence of the pulse signal. During PFM modulation, the switching frequency of the power supply changes with the load of the system, so the PFM modulation mode makes the switching power supply system have higher efficiency under light load, which is the main reason why the PFM modulation mode is widely used. In addition, under the PFM modulation mode, the switching power supply generally works in the i...
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IPC IPC(8): H02M3/158
Inventor 刘永根熊江
Owner ACTIONS ZHUHAI TECH CO