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Switch power source

A technology of switching power supply and switching circuit, which is applied in 66 fields, can solve problems such as deterioration of stability, prolonged time interval, and increased loss of rectification circuit, so as to reduce losses, prevent the generation of direct current, and prevent the effects of direct current

Inactive Publication Date: 2003-01-01
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in this case, the stability of the output voltage Vo may be compromised because multiple converters are able to stabilize the output voltage Vo
In order to prevent the stability of the output voltage Vo from deteriorating, it is necessary to correctly adjust the operation of the converter to the converter, which will make the control more complicated
Especially when a transistor is used as a rectifier element to form a rectifier, and the secondary voltage of the transformer 1 is used to turn on / off, the loss on the rectifier circuit will increase, because the dead time of the half-bridge circuit 4 increases with the time of the half-bridge circuit 4 work has ups and downs than ups and downs
In case the duty ratio of the half-bridge circuit 4 drops due to the need for a lower output voltage (e.g. 1.5V) Vo, the dead time of the half-bridge circuit 4 will be extended, in which the time interval during which no voltage is generated on the secondary side of the transformer 1 will be extended

Method used

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Embodiment approach 1

[0081] figure 1 is a circuit diagram of the switching power supply 120 in the first embodiment of the present invention.

[0082] Such as figure 1 As shown, the switching power supply 120 of the first embodiment of the present invention is a synchronously rectified power supply of a typical conventional switching power supply of the so-called half-bridge type. However, the difference of the switching power supply 120 of this embodiment of the present invention is that the first timing signal generating circuit 121 is inserted between the rectifying transistor driving circuit 104 and the gate of the first rectifying transistor 113, and the rectifying transistor driving A second timing signal generating circuit 122 is inserted between the gate of the circuit 104 and the second rectifying transistor 114; its difference is that the first auxiliary capacitor 123 is connected to both ends of the first diode 115, and the The two ends of the second diode 116 are connected to the s...

Embodiment approach 2

[0111] A second embodiment of the present invention will be described in detail below with reference to the accompanying drawings, wherein like components are denoted by like characters and their descriptions are omitted. This embodiment of the present invention is specific for carrying out the present invention, and the present invention is not limited to this embodiment described here.

[0112] Figure 8 It is a circuit diagram of a switching power supply; Figure 9 is when the sum of the dead time and the transformer leakage commutation time is equal to the switching delay time of the synchronous rectification element, Figure 8 A timing diagram of each partial voltage / current waveform in the switching power supply shown; Figure 10 It is the timing diagram of each part of the voltage / current waveform when the transformer leakage commutation time is shorter than the switching delay period of the switching power supply synchronous rectification element in the switching pow...

Embodiment approach 3

[0156] A third embodiment of the present invention will be described below with reference to the drawings.

[0157] Figure 13 is a circuit diagram of the switching power supply 330 in the third embodiment of the present invention.

[0158] Such as Figure 13 As shown, the switching power supply 330 in this embodiment of the present invention employs a primary circuit comprising a bark converter circuit and a half bridge circuit, which are connected in series as conventional switching power supplies. The difference between the switching power supply 330 and the traditional (third related technology) switching power supply is that the rectifying circuit 55 in the traditional switching power supply is replaced by the rectifying circuit 331, and the control circuits 332 and 333 replace the control circuit 63 in the traditional switching power supply . As for the rest, since the switching power supply in the present invention is structurally similar to a conventional switching ...

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Abstract

A switching power supply unit of the present invention includes a timing generating circuit (121) which receives a first control signal formed by a rectifier-transistor driving circuit (104), forms a second control signal based on the first control signal, and supplies the second control signal to a control electrode of the rectifier transistor (113). The first control signal is synchronized with the switching operation of a half-bridge circuit (102), and the second control signal exceeds a threshold voltage of a rectifier transistor (113) at a timing substantially equal to the timing that one edge of the first control signal is generated and falls below the threshold voltage of the rectifier transistor (113) at a timing earlier by predetermined time than the timing that the other edge of the first control signal is generated.

Description

Background of the invention [0001] The invention relates to a switching power supply, in particular to a synchronous rectification switching power supply, a switching power supply with a half-bridge circuit, and a switching power supply utilizing multiple converters connected in series. [0002] Related Technology 1 [0003] By convention, people call the DC / DC converter a switching power supply. A typical DC / DC converter uses a switching circuit to convert the input alternating current into direct current at one time, then uses a transformer to change (increase or decrease) the voltage, and then uses the output circuit to convert the direct current into alternating current, where the output alternating current voltage is different from Input voltage. [0004] In some cases, switching elements such as transistors are used in the output rectifier of the DC / DC converter, so that these switching elements can be controlled together with the switching circuit on the input side. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCY02B70/1475H02M3/33592Y02B70/10
Inventor 高木雅和山本纯一清水克彦财津俊行
Owner TDK CORPARATION
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