Switching power control system and method thereof
A technology of switching power supply and control method, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc.
Active Publication Date: 2014-08-13
ACTIONS ZHUHAI TECH CO
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Similarly, when the load current is increased instantaneously from a low PWM duty cycle mode, and thus needs to be converted to a high PWM duty cycle mode, the output voltage drop problem will also be caused
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[0027] In the following description, many technical details are proposed for the reader to better understand this application. However, those of ordinary skill in the art can understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required by the claims of this application can be implemented.
[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0029] The first embodiment of the present invention relates to a switching power supply control system. image 3 It is a schematic diagram of the structure of the switching power supply control system. The switching power supply control system includes: a reference voltage and reference current generation circuit 10, a PWM control circuit 20, a PFM control circ...
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The invention relates to switching power supply technology, and discloses a switching power supply control system and a method thereof. In the present invention, a preset duty cycle adjustment circuit is included, which is used to compare the voltage feedback signal and the current feedback signal with the received reference voltage signal or reference current signal to determine whether to output the mode switching signal; and according to the received The mode switching signal outputs the control logic signal to the power switch driving circuit. Since the control logic signal output by the preset duty ratio adjustment circuit can directly be a control logic signal with a higher conduction duty ratio, when the load current increases instantaneously, the control logic output by the preset duty ratio adjustment circuit can be directly The signal is output to the power switch drive circuit without waiting for the PWM control circuit to slowly adjust from a low on-duty cycle to a high on-duty cycle, so that the actual output voltage of the switching power supply can be rapidly increased and the transient state of the load can be improved Response, avoid affecting the normal work of electronic equipment.
Description
technical field [0001] The invention relates to switching power supply technology, in particular to transient response in switching power supply technology. Background technique [0002] Due to the increasing popularity of portable consumer electronic products, the switching power supply technology of portable electronic devices has been developed rapidly. Switching power supplies usually have two working modes: pulse width modulation (Pulse Width Modulation, "PWM" for short) and pulse frequency modulation (Pulse Frequency Modulation, "PFM" for short). [0003] In the PWM working mode, the switching power converter works at a constant switching frequency, and the PWM control circuit gradually adjusts the conduction time of the power switch according to the load condition. Usually in PWM mode, the switching power supply has a strong load capacity. Higher efficiencies can be achieved at heavy loads, while constant switching losses degrade efficiency at light loads. [0004]...
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IPC IPC(8): H02M3/158
CPCH02M2001/0032Y02B70/16H02M3/155H02M1/0032Y02B70/10
Inventor 刘永根熊江肖丽荣
Owner ACTIONS ZHUHAI TECH CO