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An AC-to-DC isolating switch power supply circuit

An isolated switching power supply, AC to DC technology, applied in the direction of converting AC power input to DC power output, DC power input to DC power output, electrical components, etc., can solve problems such as unreachable, reduce overall cost, reduce Effect of voltage stress, winding reduction

Pending Publication Date: 2019-01-18
HEXING ELECTRICAL +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the power required by the power supply is small, if the flyback topology power supply is used, the cost will not be comparable to that of the linear power supply due to the voltage stress of the power switch tube and the large number of high-frequency transformer windings.

Method used

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  • An AC-to-DC isolating switch power supply circuit
  • An AC-to-DC isolating switch power supply circuit
  • An AC-to-DC isolating switch power supply circuit

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Embodiment Construction

[0036] In order to facilitate the understanding of the technical solution of the present invention, the following in conjunction with the attached Figure 2-3 Describe in detail with specific embodiments.

[0037] A low-power and low-cost AC-to-DC isolated switching power supply circuit, including an AC input lightning protection circuit, an overvoltage protection circuit, a rectifier circuit, an EMI filter circuit, a first power conversion circuit, a power conversion transformer T2, and a second power conversion circuit , the first group of DC output circuits, the second group of DC output circuits; the functional block diagram between each circuit is as follows figure 2 As shown, the circuit schematic diagram is shown in image 3 shown.

[0038] (1) AC input lightning protection circuit: The single-phase AC input lightning protection circuit unit adopts the lightning protection device commonly used on the electric energy meter: varistor MOV3, which is used to suppress insta...

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PUM

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Abstract

The invention discloses an AC-to-DC isolating switch power supply circuit, which comprises a rectifier circuit, a filter circuit, a first power conversion circuit, a power conversion transformer, a second power conversion circuit, a first group of DC output circuits and a second group of DC output circuits, wherein the two groups of voltages isolated from each other are outputted by adopting a topological structure different from that of a conventional flyback topological power supply. A first power conversion circuit operates on the same principle as a high voltage BUCK circuit, Therefore, the voltage stress of the required power switch transistor is reduced, and a group of power sources isolated from the first group of DC output circuits can be outputted to supply power to the second group of DC output circuits at the back end only by adding a secondary winding to the power conversion transformer. Finally, a low-power switching power supply with the same cost as linear transformer and similar performance to the original flyback topology power supply is realized.

Description

technical field [0001] The invention relates to a low-power and low-cost AC-to-DC isolation switching power supply solution, which is mainly applied to single-phase electronic ordinary electric energy meters that require isolation and power supply for circuits with insulation requirements. Background technique [0002] At present, in the electric meter industry, in addition to ensuring the metering function, the design of the electric energy meter basically has a communication function, which enables the electric energy meter to read the meter automatically or semi-automatically, relieves the labor intensity of the meter reader and improves the accuracy of the meter reading data. Due to cost pressure, single-phase electronic ordinary electric energy meters generally use RS-485 or RS-232 in communication. This communication mode requires low power supply, usually only 1-2 watts, but the electric energy meter must inevitably reserve low-voltage terminals (<40V) for communic...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M3/335H02M1/32
CPCH02M1/32H02M3/33561H02M3/33592H02M7/217H02M1/325
Inventor 汪继伟刘健
Owner HEXING ELECTRICAL
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