a switching power supply
A switching power supply and switching element technology, applied in electrical components, regulating electrical variables, instruments, etc., can solve the problems of complex circuit structure and interference, and achieve the effect of strong anti-interference ability, low cost and high power
Active Publication Date: 2016-12-14
CHENGDE DINGXIN AUTOMATION ENG
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Problems solved by technology
However, the technical solution of the disclosed switching power supply device adopts a single power supply output, and more analog electronic devices make the circuit structure complex, which is easy to cause mutual interference
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[0034] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0035] figure 1 It is a structural schematic diagram of a switching power supply according to a specific embodiment of the present invention. The switching power supply includes a power supply unit, a pulse width modulation circuit unit 103, a feedback voltage unit 104, an oscillator 105, a switch element 106 and a transformer unit 107, wherein the power supply unit is connected to the transformer unit 107 and the pulse width modulation circuit unit 103, and the pulse width The modulation circuit unit 103 is connected to the oscillator 105 and the feedback circuit unit 104, and is connected to the transformer unit 107 through the switch element 106;
[0036] The power supply unit includes a first power supply unit 101 for charging the transformer unit and a second power supply unit 102 for powering...
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The invention discloses a switching power supply. The switching power supply uses a pulse width modulation (PWM) integrated chip to control the switching frequency of a MOS switching tube, and adjusts the feedback voltage through a three-terminal adjustable shunt circuit. When the system voltage changes , The pulse width modulation integrated chip controls the charging and discharging process and charging and discharging frequency of the transformer unit according to the feedback voltage signal and the natural frequency clock signal generated by the external oscillator, adjusts the system voltage, and stabilizes the voltage signal output by the transformer unit. The switching power supply implemented in the present invention solves the problem of voltage drop (rising) due to interference, makes the number of voltage output channels adjustable, has strong anti-interference ability, wide frequency bandwidth, high power, controllable switching frequency, low cost, easy integration and Easy to use features.
Description
technical field [0001] The invention relates to a switching power supply. Background technique [0002] Any electronic product needs a power supply. The power supply is the energy source for the entire system to work. Most of the power supply is an integrated switching power supply, and some use a transformer variable voltage power supply. [0003] The integrated switching power supply has the advantages of small size, high switching frequency, high work efficiency, and convenient use. It is widely used in instrumentation, precision equipment and other fields. However, due to the size of the integrated switching power supply and its own switching characteristics, there are also some disadvantages ( For example, the passband is generally very narrow, there is electromagnetic radiation to the outside, poor anti-interference ability, large ripple, etc.), in view of the above situation, if the integrated switching power supply is used in industrial products, it will have great l...
Claims
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IPC IPC(8): H02M3/335
Inventor 王东壮王志国
Owner CHENGDE DINGXIN AUTOMATION ENG