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PFC soft switching circuit of BOOST circuit

A soft switch and circuit technology, applied in the direction of high-efficiency power electronic conversion, electrical components, and adjustment of electrical variables, can solve the problems of increasing the difficulty of control, occupying I/O interfaces, and complicated implementation methods, and achieves simple and effective implementation methods. Effect of reducing shutdown stress and improving system stability

Inactive Publication Date: 2016-06-29
SUNSHINE & CELL POWER SYST EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some existing "soft switches" designed for BOOST boost circuit architecture are usually realized by means of auxiliary transistor circuits. Due to the addition of auxiliary transistors, this "soft switch" circuit must have a drive circuit and occupy the I / O of the control chip. O interface, while increasing the difficulty of control, when the I / O interface is not enough, it may be necessary to choose a chip with a higher cost, which has certain limitations and the implementation method is more complicated

Method used

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  • PFC soft switching circuit of BOOST circuit
  • PFC soft switching circuit of BOOST circuit
  • PFC soft switching circuit of BOOST circuit

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Embodiment Construction

[0033] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0034] Such as figure 1 As shown, a PFC soft switching circuit of a BOOST circuit includes a switch SW4 and a freewheeling diode D1 in the BOOST circuit; it also includes an inductor L2, a capacitor C1, a capacitor C2, a filter electrolytic capacitor C3, a diode D2, a diode D3, and a diode D4 and resistor R5, a branch formed by connecting capacitor C1 and diode D2 in series in the same direction, connected in parallel at both ends of the freewheeling diode D1 in the same direction;

[0035] One end of the inductor L2 is connected to the positive pole of the capacitor C1, and the other end of the inductor L2 is connected to the positive pole of the switch SW4;

[0036] After one end of the capacitor C2 is connected in series with the anode of the diode D3 in the same direction as a branch circuit, th...

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Abstract

The invention discloses a PFC soft switching circuit of a BOOST circuit. The PFC soft switching circuit comprises a switch SW4 and a freewheel diode D1 in the BOOST circuit, and also comprises an inductor L2, a capacitor C1, a capacitor C2, a diode D2, a diode D3 and a diode D4, wherein a branch formed by the capacitor C1 and the diode D2 homodromously connected in series is homodromously connected with the two ends of the freewheel diode D1 in parallel; the PFC soft switching circuit also comprises a freewheel diode D5, a switch SW1, an inductor L3, an inductor L4, a diode D5, a diode D7, a diode D8, a capacitor C4, a capacitor C5, a capacitor C6 and a resistor R6, wherein the negative pole of an input power VCC is connected with one end of the inductor L4, and the other end of the inductor L4 is connected with the cathode of the freewheel diode D5. The PFC soft switching circuit does not need the complex control technology, nor need the auxiliary IGBT, is simple and effective in implementation mode, and can always achieve useful effect from light load to heavy load.

Description

technical field [0001] The invention relates to the field of supporting circuits for BOOST circuits, in particular to a PFC soft switch circuit for BOOST circuits. Background technique [0002] BOOST circuit is a switching DC boost circuit, which is mainly used in power electronics technology, switching power supply technology, new energy technology and other fields. At present, the BOOST circuit basically adopts the scheme of charging the inductor first and then releasing the energy stored in the inductor to the capacitor to increase the voltage. However, due to the high loss of the switching device and the large heat generation, the circuit conversion efficiency is low and the circuit life is short. . [0003] Soft switch: The English name of soft switch is "softswitching", that is, through reasonable circuit design, the switching device is in a zero-voltage / zero-current on / off state during the turn-on and turn-off transients, so as to reduce the loss of the switching dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/1582H02M1/0058Y02B70/10
Inventor 古元罗润汉林为尹晓娟封宁波白维钟立亮聂文强李静静向延钊
Owner SUNSHINE & CELL POWER SYST EQUIP
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