Switching type power convertor and its synchronous rectifier control method
A synchronous rectifier and power converter technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of large loss, high cost, and low accuracy
Inactive Publication Date: 2009-10-28
DELTA ELECTRONICS INC
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Problems solved by technology
The current of the synchronous rectifier on the secondary side of the power transformer can be detected by direct detection and indirect detection; the indirect detection method is to detect the current signal of the primary side of the transformer, then subtract the magnetization current of the primary side of the transformer, and obtain the secondary The current of the secondary side synchronous rectifier, the disadvantage of the indirect method is that the detection accuracy is not very high
In addition, direct detection is to use Hall sensor (Hall sensor), current transformer (current transformer), or sensing resistor (sensing resistor) to directly obtain the current information of the synchronous rectifier, but these detection methods will encounter problems such as Difficulties such as high cost, large volume, and large loss are relatively rare in actual product applications
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[0047] The technical feature of the present invention is to switch the device Q on the primary side 2 When opening (t c ), then turn off the secondary side synchronous rectifier S 1 . In the absence of load current information, in order to meet the needs of the full range of loads, this control method is optimized, which can ensure that the synchronous rectifier on the secondary side is turned on during the primary side resonance phase.
[0048] Figure 8 It is the logic circuit diagram of the control method of the asymmetric zero-voltage switching half-bridge converter of the present invention, which uses a combination of a pair of diodes, a pair of resistors, a pair of capacitors, and a pair of buffer circuits to drive two synchronous rectifiers. 1 And S 2 , The delay time of closing the delay circuit in the figure is designed as t c -t b . Picture 9 It is the main waveform timing diagram under this embodiment. It can be seen from the figure that the synchronous rectifier S 1 ...
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A control method for a switch-type power converter, the switch-type power converter includes a transformer, a first switch device and a second switch device, the first switch device and the second switch device are connected in series with each other, and are connected in parallel to each other an input voltage source, the first synchronous rectifier is connected to the non-identical terminal of a secondary winding of the transformer, the second synchronous rectifier is connected to the same terminal of a secondary winding of the transformer, and the first switching device is connected to On a high-voltage end of the input voltage source, the second switch device is connected to a low-voltage end of the input voltage source, and the control method includes: driving the first switch device in an on state, driving the second switch device in an off state and driving the second synchronous rectifier in an off state after the second switching device is driven in an on state, so that electric energy is transmitted from the primary winding to the secondary winding.
Description
Technical field [0001] The invention relates to a switching power converter and a control method of a synchronous rectifier, in particular to a method and a circuit for synchronous control of a zero-voltage switching DC / DC converter. Background technique [0002] The development trend of direct current / direct current (DC / DC) converters, like most power products, is toward high efficiency, high power density, high reliability, and low cost. cost). In the traditional zero voltage switching (ZVS) DC / DC converter with diode rectification, the conduction loss of the rectifier diode usually accounts for 30-40% of the total loss. If you want to further improve the traditional ZVS DC / DC conversion The efficiency of the rectifier requires the application of synchronous rectification technology to reduce the conduction loss of the rectifier. The application of synchronous rectification technology can greatly reduce the conduction loss of output rectification, but it also brings about the p...
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IPC IPC(8): H02J3/00H02J3/38
Inventor 言超叶浩屹吴洪洋曾剑鸿应建平
Owner DELTA ELECTRONICS INC