Constant voltage control circuit
A constant voltage control and circuit technology, applied in electrical components, conversion equipment without intermediate conversion to AC, and output power conversion devices, etc., can solve the problems of product miniaturization, cost increase, and PCB board area increase Achieve the effect of fewer components, low cost, and reduced PCB area
Pending Publication Date: 2021-12-17
MORNSUN GUANGZHOU SCI & TECH
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[0007] The disadvantage of this circuit is that the components are nearly twice as many as the output constant voltage control circuit of the unipolar switching power supply, and the cost increases, and especially for the high-voltage power supply, due to the high output voltage of the high-voltage power supply, the high cost of the sampling circuit There are many potential areas. If there are more sampling circuits, there will be more high-potential areas on the PCB. When the device is laid out, there will be more requirements for the safety distance of the device, which will cause a sharp increase in the area of the PCB board and hinder the miniaturization of the product.
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[0022] Such as figure 2 Shown is the functional block diagram of the present invention. The constant voltage control circuit of the present invention is applied in a switching power supply with switchable output voltage polarity. When the output voltage polarity of the switching power supply changes from positive polarity to negative polarity, or When changing to positive polarity, by adjusting the wiring mode of the sampling circuit, the output constant voltage control circuit can satisfy the logic operation required by two output signals with different polarities only by an error comparator, so that the output voltage can be adjusted and controlled in time The magnitude of the feedback voltage makes the switching power supply still work normally after changing the polarity of the output voltage. The circuit of the invention is simple, and the switching response of positive and negative polarity is fast, and compared with the prior art, the number of components is greatly re...
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The invention discloses a constant voltage control circuit, which is applied to a switching power supply with switchable output voltage polarity. The constant voltage control circuit is characterized in that when the polarity of the output voltage of a switching power supply is converted from the positive polarity to the negative polarity or from the negative polarity to the positive polarity, the wiring mode of a sampling circuit is adjusted, so that the output constant voltage control circuit can meet a logic operation required by two output signals with different polarities only through one error comparator, the feedback voltage of the output voltage can be timely adjusted and controlled, and the switching power supply can still work normally after the polarity of the output voltage is changed. According to the invention, the circuit is simple, positive and negative polarity switching response is rapid, compared with the prior art, the number of components is greatly reduced, cost is reduced, and the size of the switching power supply is reduced.
Description
technical field [0001] The invention relates to a switching power supply, in particular to constant voltage control of a power supply with switchable output voltage polarity. Background technique [0002] The switching power supply used in some special applications requires different polarity of the output voltage of the switching power supply due to the different usage conditions. At some moments, the switching power supply needs to output positive polarity voltage, and at other moments it needs to switch The power supply outputs a negative polarity voltage, which requires that the output voltage polarity of the switching power supply can be controlled. According to different control signals, the output voltage polarity can be switched from positive polarity to negative polarity, or from negative polarity to positive polarity, and For the output constant voltage control circuit of this type of switching power supply, when the output voltage polarity of the switching power s...
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IPC IPC(8): H02M3/10H02M1/00
CPCH02M3/156H02M1/00
Inventor 不公告发明人
Owner MORNSUN GUANGZHOU SCI & TECH