Micropower power supply converting circuit

Abstract

The invention discloses a micropower power supply converting circuit, which comprises a first resistive circuit, a first switching triode, a second switching triode, a transformer, a first diode, a second diode and a third capacitive circuit, wherein one end of a first resistor is connected with an input voltage end, while the other end is a first connecting wire; a variant-name end of a third winding is connected with the base of the second switching triode; and the other components are connected according to a common DC-DC conversion circuit. The micropower power supply converting circuit further comprises a second capacitive circuit and a fourth winding of the transformer, wherein one end of the second capacitive circuit is connected with the first connecting wire, while the other end is grounded; a variant-name end of the fourth winding is connected with a same-name end of the third winding to form a second tap of the transformer; and a same-name end of the fourth winding is connected with the base of the first switching triode and the second tap is connected with the first connecting wire. The micropower power supply converting circuit realizes DC-DC conversion with high isolation of input and an outputs and short circuit protection function on the application occasions of less than or equal to output power of 5W.

Description

Technical field [0001] The invention relates to a power conversion circuit, in particular to a micro-power direct current-direct current (DC-DC) conversion circuit. Background technique [0002] At present, the Royer topology is commonly used in micro-power DC-DC conversion, and the commonly used micro-power DC-DC conversion application circuits are such as figure 1 As shown, it includes a first resistance circuit R, a first switching transistor Q1, a second switching transistor Q2, a transformer T1, a first diode D1, a second diode D2, and a third capacitor circuit C3. The transformer includes a first winding N1, the second winding N2, the third winding N3, the fifth winding N5, the sixth winding N6, the first tap P1, the third tap P3, the first tap has the same name from the first winding N1 of the transformer and the second winding N2. The third tap is composed of the synonymous end of the fifth winding N5 of the transformer and the same end of the sixth winding N6; the first ...

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Problems solved by technology

[0003] Therefore, there are generally several disadvantages: 1. Current peaks will be generated at the moment of switching transition; 2. Due to the small number of components, the circuit has no protection function, and the switching power device is easily damaged; 3. Since the primary and secondary sides of the transformer are wound together, the The isolation between the input and output terminals of the circuit is not easy to improve, and the isolation capacitance is large; 4. Due to the high coupling coefficient of the transformer, when a short circuit occurs at the output terminal, the switch tube is easily broken down, making the power converter easily damaged

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