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power supply unit

A technology for power supply devices and inductors, which is applied in the direction of output power conversion devices, energy industry, electrical components, etc., and can solve problems such as return diode loss

Inactive Publication Date: 2017-04-12
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the return current all flows to the return diode, and as a result, losses are generated in the return diode
The losses in the return diode are even greater than those in the body diode

Method used

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Examples

Experimental program
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Embodiment Construction

[0036] refer to Figure 3A and Figure 3B , first, a comparative example of a switching power supply device having a bridgeless PFC circuit that reduces losses in the body diode will be described.

[0037] exist Figure 3A and Figure 3B , the same reference numerals refer to the figure 1 The components of the switching power supply device shown are the same or equivalent components, and descriptions thereof will be omitted.

[0038] The switching power supply device of the comparative example does not have the same figure 1 The diodes corresponding to the return diode D3 and the return diode D4 provided in the switching power supply device shown are.

[0039] Figure 3A and Figure 3B is a diagram showing a current path when the AC input voltage VAC is a positive half cycle. In the positive half cycle, the PFC is controlled by switching the first switching element TR1 and turning on the second switching element TR2.

[0040] Figure 3A shows the current path when th...

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PUM

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Abstract

Disclosed is a power supply device comprising: a first series circuit connected between a first output terminal and a second output terminal and including a first switching element and a first rectifying element; a second series circuit connected at the an output terminal and a second output terminal and including a second switching element and a second rectifying element; a third switching element inserted between a connection point between the first inductor and the first input terminal and the second output terminal; a fourth switching element inserted between a connection point between the second inductor and the second input terminal and the second output terminal; a control circuit configured to control the first switching element and the second switching element; and a synchronous rectification control circuit, configured to control the third switching element and the fourth switching element.

Description

technical field [0001] Embodiments discussed herein relate to a power supply device. Background technique [0002] In recent years, energy saving in various fields has attracted public attention, and as a result, its influence has spread to many fields including, for example, the field of power supplies. In particular, for example, there is a need for more efficient switching power supply devices. [0003] A power factor correction (PFC) converter that corrects the power factor of a switching power supply device includes: a diode bridge that inputs general-purpose AC power and performs full-wave rectification on the input AC power; and a step-up chopper circuit that inputs full-wave rectified voltage. In order to reduce power loss in a diode bridge circuit, there is also a switching power supply device that functions as a bridgeless PFC that does not have a rectifier bridge circuit. [0004] figure 1 An example of a circuit diagram of a switching power supply device havi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M1/4225H02M3/1584Y02B70/10Y02P80/10H02M1/0085H02M1/42H02M3/10H02M3/145H02M3/155H02M7/06
Inventor 中尾宏米泽游中岛善康
Owner FUJITSU LTD