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AC/DC flyback converter

A flyback converter and main transformer technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, instruments, etc. The effect of low loss, reduction of charge and discharge time, and extension of power supply time

Pending Publication Date: 2021-11-02
深圳崧盛创新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the input voltage range is wide, V H Continue to rise, V L Continue to decrease, the performance of switching power supply will further deteriorate, and the cost will further increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The internal functional units of the flyback controller in Embodiment 1 are as follows: Figure 10 As shown, the SSR flyback controller also includes a current detection and processing unit, a valley detection and sampling and feedback unit, a valley detection and sampling and feedback unit and a multi-mode CCM / QR / DCM controller, optocoupler connection, current detection and processing The unit is connected to the power frequency switch unit, and the optocoupler is connected between the output filter capacitor Co and the output load R through the sampling and feedback circuit. Both the bus voltage sampling and the high-voltage start-up involve the DC bus voltage Vb, and the internal power supply starts to work after the high-voltage start-up is completed, so the three can optionally share the same functional unit. The current detection and processing unit realizes the peak current mode control and real-time overcurrent protection function by detecting the MOSFET primary...

Embodiment 2

[0074] In the second embodiment, the internal functional units of the bus voltage regulator and the flyback controller are as follows: Figure 12 As shown, the bus voltage regulator includes a bus voltage sampling and high-voltage starting and internal power supply unit, a bus voltage controller, and a power frequency switch unit. , the split SSR flyback controller includes enable and protection logic unit, multi-mode CCM / QR / DCM controller, gate drive unit, current detection and processing unit, valley detection and sampling and feedback unit, internal power supply unit , the auxiliary power supply winding is rectified by the diode Da and filtered by the power supply filter capacitor Ca, and then connected to the internal power supply unit of the SSR flyback controller. The working principle of the bus voltage regulator and flyback controller mainly involves the DC bus capacitor wiring method in the power part, as well as the bus voltage controller, power frequency switching u...

Embodiment 3

[0076] The internal functional units of the flyback hybrid controller in Embodiment 3 are as follows: Figure 14 As shown, it mainly includes bus voltage sampling and high-voltage start-up and internal power supply unit, enabling and protection logic unit, multi-mode CCM / QR / DCM controller, current detection unit, valley detection and sampling and feedback unit, etc. The power switch tube Q1 has been integrated into the flyback hybrid controller, and the internal current detection unit detects the primary side current to realize the peak current mode control and real-time overcurrent protection function, and at the same time, the internal gate drive unit directly drives the MOSFET. The working principle of the flyback hybrid controller mainly involves the wiring method of the DC bus capacitor in the power part, as well as the bus voltage controller, the power frequency switch unit and the gate drive unit in the flyback controller. Figure 3-7 They are exactly the same, and will...

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Abstract

The invention provides an AC / DC flyback converter. The AC / DC flyback converter comprises a DC bus capacitor, a primary side power switch tube, a body diode of the primary side power switch tube, a main transformer, an output filter capacitor, an output load, a secondary side rectifying circuit and a flyback controller. The on-off time point of a power frequency switch unit is controlled through a bus voltage controller, the amplitude change of the direct current bus voltage is controllable or adjustable, the capacitance of a direct current bus can be reduced, a gate driving unit can accelerate a switching speed and reduce the EMI interference by utilizing different equivalent resistance values of driving resistors in the on-off process of a power switch tube, meanwhile, a reverse synchronous rectification controller can enable the primary side power switch tube to realize zero-voltage switching, so that the conversion efficiency of the switching power supply is improved, the device cost is reduced, and in addition, the size of the switching power supply can be reduced by various high-integration controller designs.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to an AC / DC flyback converter. Background technique [0002] Switching power supplies are widely used in various consumer electronics and industrial equipment, such as chargers, power adapters, LED drivers and industrial power supplies. For low-power switching power supplies with an output power below 65W, there is no requirement for a power factor correction (PFC) function in domestic and foreign standards. The input of the switching power supply comes from the AC power grid, and its main components are EMI filter, input rectification circuit and power converter. Generally, the traditional AC / DC flyback converter is used for small and medium power, such as figure 1 shown. Among them, Lf and Cf are the filter inductance and filter capacitor of the input EMI filter, D1~D4 are the input rectifier diodes, R L is the output load, and Cb is the filter capacitor, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M3/335H02M1/32H02M1/42H02M1/44
CPCH02M7/217H02M3/33569H02M3/33592H02M1/4241H02M1/32H02M1/44Y02B70/10
Inventor 袁源兰
Owner 深圳崧盛创新技术有限公司
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