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High-power factor active valley-fill type alternating current and direct current converter

An AC-DC conversion and high power factor technology, applied in the electronic field, can solve problems such as difficult to further improve the AC input power factor

Active Publication Date: 2014-04-30
江苏鑫昊空调设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it as difficult for active-controlled valley-fill circuits as for passive valley-fill circuits to further improve their AC input power factor

Method used

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  • High-power factor active valley-fill type alternating current and direct current converter
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  • High-power factor active valley-fill type alternating current and direct current converter

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1, a high power factor active valley filling AC-DC converter, such as Figure 5 Shown: including a diode rectifier bridge 1, an active nonlinear capacitor network 2 and a subsequent switching power converter 3.

[0054] 1. The diode rectifier bridge 1 consists of 4 diodes (conventional technology).

[0055] 2. The active nonlinear capacitor network 2 is specifically composed of an energy storage capacitor C, a switch network, a switch control module A and a switch K.

[0056] The switch network is composed of active switch M, inductor L and freewheeling diode D. The switch K is a bidirectional switch.

[0057] The electrical connection relationship of the active nonlinear capacitor network 2 is as follows: the energy storage capacitor C is connected in series with the switch K to form a branch; the freewheeling diode D is connected in series with the active switch M to form another branch; the above two The branches are connected in parallel with each othe...

Embodiment 2

[0071] However, in Embodiment 1, the charging circuit of the energy storage capacitor C needs an active switch M, an inductor L and a freewheeling diode D, which increases the cost and complexity of the entire system. In energy-saving lamps, LED lighting and other low-power and cost-sensitive products, the present invention can also be used to realize a low-cost and high-power-factor active valley-filling AC-DC converter. Due to the low power of energy-saving lamps, LED lighting, etc., the value of the energy storage capacitor C in the active nonlinear capacitor network 2 can be selected as a relatively low value, such as a capacitance value between 0.1uF and 4.7uF. There are many types of capacitors; in addition to electrolytic capacitors, there are film capacitors, ceramic dielectric capacitors, and so on. The life of electrolytic capacitors is affected by the ambient temperature in which they work. When the ambient temperature increases by ten degrees, the life of the electr...

Embodiment 3

[0089] Embodiment 3, as Figure 7 As shown, a conventional N-channel MOSFET is used as the switch K (in contrast, a P-channel MOSFET in Example 2); the rest are identical to Example 2.

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Abstract

The invention belongs to the technical field of electronics, and relates to alternating current and direct current conversion and power control, in particular to a high-power factor active valley-fill type alternating current and direct current converter. The high-power factor active valley-fill type alternating current and direct current converter is composed of a diode rectifier bridge (1), an active nonlinear capacitance network (2) and a subsequent switch power converter (3), wherein the output of the diode rectifier bridge (1) supplies the active nonlinear capacitance network (2) and the subsequent switch power converter (3) with power; the output of the active nonlinear capacitance network (2) is controlled to supply the subsequent switch power converter (3) with power.

Description

technical field [0001] The invention belongs to the technical field of electronics, and relates to AC and DC current conversion and power control. More specifically, the present invention relates to a high power factor active valley filling AC-DC converter. Background technique [0002] In the case of AC power supply, in order to achieve high power factor and meet the harmonic requirements of IEC61000-3-2, the AC-DC converter needs to realize the function of power factor correction. Active boost power factor correction circuit is a very popular method, but it requires a more complicated control loop to control the active power switch to realize the power factor correction function, and its power factor can reach 0.98. In low-cost, widely used in energy-saving lamps, LED lighting and other low-power, cost-sensitive products, passive valley-filling power factor correction circuits (such as figure 1 shown), the simplicity of the circuit is popular due to the absence of active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M1/42
CPCY02B70/10
Inventor 翁大丰魏其萃
Owner 江苏鑫昊空调设备有限公司
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