A switching power supply and its control circuit and control method
A technology for control circuits and switching power supplies, applied in control/regulation systems, emergency protection circuit devices, electrical components, etc., to solve the problems of output voltage overshoot, easily affecting service life, power devices and filter capacitors withstanding voltage overshoot, etc.
Active Publication Date: 2021-04-23
HANGZHOU SILAN MICROELECTRONICS
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Problems solved by technology
However, if figure 1 As shown, if the power supply often works in an environment with light load and severe and frequent grid fluctuations, the output voltage overshoot will occur frequently, but the set hardware overvoltage protection will not be triggered, causing the back-end power devices and Filter capacitors are frequently subjected to voltage overshoots, which can easily affect their service life
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[0059] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown in the drawings.
[0060] In the following, many specific details of the present invention, such as structures, materials, dimensions, processes and techniques of components, are described for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.
[0061] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an...
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The invention discloses a switching power supply and its control circuit and control method. The control circuit includes a control unit, a voltage limit threshold adjustment unit, a voltage limit protection unit and a drive unit. The control unit is used to generate a first control signal and adjust the voltage limit threshold. The unit is used to obtain the first reference voltage according to the target voltage signal, the voltage limiting protection unit is used to output the second control signal according to the sampling voltage of the output voltage, the first reference voltage and the first control signal, and the driving unit is used to output the second control signal according to the second control signal Output the driving signal for controlling the power switch tube. The voltage limiting threshold adjustment unit is also used to adjust the voltage limiting protection threshold of the output voltage in real time by detecting the load state. When the switching power supply encounters grid fluctuations under different load conditions, It can ensure that the output voltage is always kept below the set voltage limiting protection threshold, so that the back-end power devices are protected from overshooting of large currents, improving their reliability and prolonging their service life.
Description
technical field [0001] The present invention relates to the technical field of switching power supply control, and more particularly relates to a switching power supply and its control circuit and control method. Background technique [0002] A switching power supply is a power supply that uses modern power electronics technology to control the on-off time ratio of the power switch tube to maintain a stable output voltage. The switching power supply is generally composed of a pulse width modulation (Pulse Width Modulation, PWM) control circuit and a power switch. tube (such as MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor Field-Effect Transistor)). Existing implementation methods of switching power supplies include analog control methods, digital control methods, and digital-analog hybrid control methods. In recent years, due to the advantages of programmability, design continuity, and small number of components, digital control method...
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IPC IPC(8): H02M7/217H02M3/156H02H7/125
CPCH02H7/125H02M3/156H02M7/217
Inventor 王建龙赵光焕厉剑波
Owner HANGZHOU SILAN MICROELECTRONICS