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Power circuit

A technology of power supply circuit and capacitor, applied in electrical components, regulating electrical variables, instruments, etc., can solve problems such as deterioration of conversion efficiency, and achieve the effect of improving the cross-regulation rate

Active Publication Date: 2014-11-12
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to suppress the deterioration of the voltage fluctuation rate like this, the method of stabilizing the output by using dummy resistors and other analog loads is taken, but in this case, the deterioration of the conversion efficiency cannot be avoided.

Method used

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Effect test

no. 1 Embodiment approach

[0049] image 3 yes figure 1 In the shown flyback 2-output power supply device 1, a circuit with the characteristics involved in the present invention is added, that is, image 3 It is a diagram showing the power supply circuit 100 according to the first embodiment of the present invention. image 3 The power supply circuit 100 has a primary coil Np and a first output coil (secondary coil) Ns1 and a second output coil (secondary coil) Ns2 coupled to each other; a switching element Q1 connected in series with the primary coil Np; used to control the switching element A control circuit IC (not shown) of Q1; a rectifying element (diode) D1 for supplying power to the first output terminal Vo1 and a rectifying element (diode) D2 for supplying power to the second output terminal Vo2. The winding directions of the primary coil Np and the secondary coils Ns1 and Ns2 are opposite, thereby forming a flyback power supply device. Here, in the first output coil Ns1, the part (node ​​Nod...

no. 2 Embodiment approach

[0060] Figure 8A It is a diagram showing the power supply circuit 200 according to the second embodiment of the present invention. The power supply circuit 200 according to the second embodiment is mainly different from the power supply circuit 100 according to the first embodiment in that the first output coil (secondary coil) Ns1 and the second output coil (secondary coil) Ns2 Both draw center taps.

[0061] The power supply circuit 200 is provided with a primary coil Np and a first output coil (secondary coil) Ns1 and a second output coil (secondary coil) Ns2 coupled to each other; a switching element Q1 connected in series with the primary coil Np; for controlling the switching element Q1 A control circuit IC (not shown in the figure); a rectifying element (diode) D1 for supplying power to the first output terminal Vo1 and a rectifying element (diode) D2 for supplying power to the second output terminal Vo2. The winding directions of the primary coil Np and the secondar...

no. 3 Embodiment approach

[0070] Figure 9 It is a figure which shows the power supply circuit 300 which concerns on 3rd Embodiment of this invention. The main difference between the power supply circuit 300 according to the third embodiment and the power supply circuit 200 according to the second embodiment is that the second output coil (secondary coil) Ns2 is connected to the first output coil (secondary coil) by adding an additional coil. Coil) Ns1 connected.

[0071] The power supply circuit 300 is provided with a primary coil Np and a first output coil (secondary coil) Ns1 and a second output coil (secondary coil) Ns2 coupled to each other; a switching element Q1 connected in series with the primary coil Np; for controlling the switching element Q1 A control circuit IC (not shown in the figure); a rectifying element (diode) D1 for supplying power to the first output terminal Vo1 and a rectifying element (diode) D2 for supplying power to the second output terminal Vout. The winding directions of...

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Abstract

A power supply circuit includes a plurality of output terminals that output voltages (voltages may have the same or different voltage values among the output terminals), and a transformer that has a plurality of output windings. First and second output windings of the plurality of output windings are coupled to each other. The first and second output windings have the same number of turns. First terminals, which have a first polarity, of the first and second output windings are connected to each other via a capacitor. Further, second terminals, which have a second polarity opposite to the first polarity, of the first and second output windings are electrically connected to each other. The second terminals of the first and second output windings may be directly connected to each other.

Description

technical field [0001] The present invention relates to a power supply circuit, in particular to a power supply circuit with improved cross regulation. Background technique [0002] In a switching power supply, it is usually necessary to constantly monitor the output voltage, compare it with the reference voltage through the error amplifier, and control the output of the power supply circuit in a way to maintain the correct output voltage. Here, in the case of a switching power supply (multi-output power supply) having a plurality of output terminals, monitoring one of the outputs for stabilization has a problem that the stability of the other cannot be maintained. In particular, if there is a load fluctuation on the output side where the stabilization monitoring is performed, other outputs sharing the primary side coil will be interfered and a stable output cannot be guaranteed. In a multi-output power supply, the situation where a voltage change on one output side interfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/315H02M5/08H02M5/10
CPCH02M3/33553H02M3/33523H02M3/33561H02M3/33507
Inventor 王跃庆王红蕾
Owner TDK CORPARATION
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