Micropower power supply converting circuit

A power conversion and micro-power technology, which is applied in the output power conversion device, the conversion of DC power input to DC power output, and the adjustment of electrical variables, etc. , large isolation capacitance, etc., to achieve the effect of ensuring reliability and stability, high mean time between failures, and high isolation voltage level

Inactive Publication Date: 2010-01-13
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Embodiment 1

[0030] For the circuit diagram of Embodiment 1 of the micropower power conversion circuit, see figure 2 As shown, it includes a first resistance circuit, a first capacitance circuit, a second capacitance circuit, a first switching transistor Q1, a second switching transistor Q2, a transformer T1, a first diode D1, a second diode D2, a first Two resistor circuits, a third capacitor circuit, wherein figure 2 The first resistor circuit includes the first resistor R1, but the embodiment of the present invention does not limit the first resistor circuit to only include the first resistor, and multiple resistors can also be combined to achieve the same function as the first resistor; figure 2 The first capacitor circuit includes the first capacitor C1, the second capacitor circuit includes the second capacitor C2, and the third capacitor circuit includes the third capacitor C3; however, the embodiment of the present invention does not limit the first capacitor circuit to only inc...

Embodiment 2

[0051] Such as Figure 5 Shown, in order to further improve the present invention, in figure 2 On the basis of the illustrated embodiment, the micropower power conversion circuit adds a second resistor circuit, and the second resistor circuit includes a second resistor R2; however, the embodiment of the present invention does not limit the second resistor circuit to only include a second resistor , the same function as the second resistor can also be realized by a plurality of resistors through circuit combination. One end of the second resistor circuit is connected to the first connection line 11, and the other end of the second resistor circuit is connected to the second tap P2. Reduce the base drive voltage of the switching transistor, suppress the switching transistor from entering deep saturation, and improve the start-up performance of the circuit; when the two switching transistors change state, the second resistor R2 absorbs the sharp energy generated at the moment o...

Embodiment 3

[0053] Such as Figure 6 Shown, in order to further improve the present invention, in figure 2 On the basis of the illustrated embodiment, the micropower power conversion circuit adds a third resistor circuit, and the third resistor circuit includes a third resistor R3; however, the embodiment of the present invention does not limit that the third resistor circuit can only include a third resistor , the same function as the third resistor can also be realized by a plurality of resistors through circuit combination. The third resistance circuit is connected in parallel at both ends of the output terminal, mainly to suppress the increase of the output voltage of the product due to load changes when the product is no-load, and improve the output characteristics of the product under light-load and no-load conditions.

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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 micropower DC-DC (DC-DC) conversion circuit. Background technique [0002] At present, Royer topology is commonly used in micro-power DC-DC conversion. Commonly used micro-power DC-DC conversion application circuits are as follows: 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 end of the first winding N1 of the transformer and the second winding N2 has a different name The third tap is composed of the fifth winding N5 end of the transformer with the same name connected to the sixth winding N6 end with the same name...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/14H02M1/32
Inventor 尹向阳
Owner MORNSUN GUANGZHOU SCI & TECH
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