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Switching electric source device

A switching power supply and power supply technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve the problems of low detection accuracy and achieve the effect of improving reliability

Active Publication Date: 2005-02-23
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the lower the ambient temperature, the lower the detection accuracy corresponding to the output voltage Vout detection circuit 30, thus, the lower the voltage Vout output to the load becomes.

Method used

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  • Switching electric source device

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Embodiment Construction

[0038] Hereinafter, preferred embodiments according to the present invention will be described with reference to the accompanying drawings.

[0039] figure 1 Main circuit elements of the switching power supply device according to the first preferred embodiment of the present invention are shown. In the description of the first preferred embodiment, with Figure 9 The same components of the switching power supply device 200 shown in FIG.

[0040] The switching power supply device 100 according to the first preferred embodiment includes a forward type DC-DC converter. In the switching power supply device 100, the transformer 1 has a fourth winding N4 in addition to the primary winding N1, the secondary winding N2, and the third winding N3.

[0041] A circuit including a DC blocking capacitor 41 connected in series and a diode 42 as a rectifying element is connected in series with the fourth winding N4, wherein the diode 42 is provided on the fourth winding N4 side. In a circ...

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Abstract

A switching electric source device includes a first synchronous rectifier control circuit, which detects the resonance state developed based on the exciting energy of the primary winding after the main switching element switches off, and causes a first synchronous rectifier to switch on earlier during the time period from the completion of the resonance state to the switching on of the main switching element. Thus, the first synchronous rectifier switches on during the time period, and thus, current is prevented from flowing through a body diode, so that a voltage caused by the voltage drop in the body diode is prevented from being induced in the secondary winding and the third winding. As a result, variations in the output voltage, which is caused by the induced voltage of the third winding, can be prevented. The output voltage can be stabilized.

Description

technical field [0001] The invention relates to a switching power supply device, which includes a transformer and a circuit for rectifying the output electric energy of the secondary winding of the transformer by using a synchronous rectifier. Background technique [0002] A prior art switching power supply device having a detection circuit for indirectly detecting an output voltage, and based on a pulse width modulation (PWM) system, a main switching element is controlled based on a detection result of the detection circuit (see, for example, Japan Unexamined Patent Application Publication No. 2001-25245 (Patent Document 1)). Figure 9 An example of the circuit configuration of the main parts of the switching power supply unit having the detection circuit as described above is shown. [0003] The switching power supply device 200 includes a transformer 1 . The main switching element (MOSFET) Q1 is connected to the primary winding N1 of the transformer 1 . A circuit includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335
CPCY02B70/1475H02M3/33592Y02B70/10H02M3/28
Inventor 长井淳辻仁司
Owner MURATA MFG CO LTD