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JFET self-excited interleaved parallel Flyback converter

A converter, self-excited technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve the problem of large loss and achieve the effect of starting with low input voltage and working in a wide input voltage range

Pending Publication Date: 2018-12-25
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of existing BJTs with large losses when constructing low-voltage input interleaved parallel Flyback converters, the present invention provides a JFET type self-excited interleaved parallel Flyback converter, the purpose of which is to simultaneously realize low input voltage start-up, wide Input voltage range operation and high efficiency

Method used

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  • JFET self-excited interleaved parallel Flyback converter
  • JFET self-excited interleaved parallel Flyback converter
  • JFET self-excited interleaved parallel Flyback converter

Examples

Experimental program
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Effect test

Embodiment 1

[0028] refer to figure 1 and figure 2 , a JFET type self-excited interleaved parallel Flyback converter, including transformer T1, transformer T2, N-type JFET tube J1, N-type JFET tube J2, diode D1, diode D2, capacitor Co, drive branch 1 and drive branch 2. The drive branch j has port aj, port bj, port cj and port dj, the value of j ranges from 1 to 2, and the positive end of the DC power supply Vi is simultaneously connected to one end of the primary side of the transformer T1 and one end of the primary side of the transformer T2 The other end of the primary side of the transformer T1 is connected to the drain of the N-type JFET tube J1 and the port c2 of the driving branch 2 at the same time, and one end of the secondary side of the transformer T1 is connected to the port d2 of the driving branch 2 and the anode of the diode D1 at the same time , the cathode of diode D1 is connected to the cathode of diode D2, one end of capacitor Co and one end of the load at the same tim...

Embodiment 2

[0034] refer to figure 1 and Figure 4 , a JFET type self-excited interleaved parallel Flyback converter, the driving branch j includes a resistor Rbj and a diode Dbj, one end of the resistor Rbj is connected to the port aj of the driving branch j, and the other end of the resistor Rbj is connected to the cathode of the diode Dbj , the anode of the diode Dbj is connected to one end of the capacitor Caj, and the value of j ranges from 1 to 2.

[0035] All the other structures of embodiment 2 are the same as embodiment 1.

[0036] The working principle of embodiment 2 is also similar to that of embodiment 1 except that the charging speed of Caj in embodiment 2 is faster than that of Caj in embodiment 1.

Embodiment 3

[0038] refer to figure 1 and Figure 5 , a JFET type self-excited interleaved parallel Flyback converter, the driving branch j includes a resistor Rcj and a diode Dcj, the anode of the diode Dcj is connected to the port aj of the driving branch j, and the cathode of the diode Dcj is connected to one end of the resistor Rcj, The other end of the resistor Rcj is connected to one end of the capacitor Caj, and the value of j ranges from 1 to 2.

[0039] All the other structures of embodiment 3 are the same as embodiment 1.

[0040] The working principle of embodiment 3 is also similar to that of embodiment 1 except that the discharge rate of Caj in embodiment 3 is faster than that of Caj in embodiment 1.

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Abstract

A JFET type self-excited interleaved parallel Flyback converter includes a transformer T1, a transformer T2, an N-type JFET transistor J1, an N-type JFET transistor J2, a diode D1, a diode D2, a capacitor Co, a drive branch 1 and a drive branch 2, wherein, in the drive branch 1, when the N-type JFET transistor J2 is turned on , a negative voltage is generated between a port a1 and a port b1 to turn off the N-type JFET transistor J1; in the driving branch 2, when the N-type JFET J1 is turned on, a negative voltage is generated between the port a2 and the port b2 to turn off the N-type JFET J2.The invention has the characteristics of low input voltage startup, wide input voltage range operation and high efficiency.

Description

technical field [0001] The invention relates to an interleaved parallel Flyback converter, in particular to an interleaved parallel Flyback converter suitable for low-voltage input, which can be applied to occasions such as LED driving, energy collection, and auxiliary power supply. Background technique [0002] Compared with the other-excited Flyback converter, the self-excited interleaved parallel Flyback converter has the advantages of small input / output current ripple, easy start-up, easy expansion, and low cost. Enhancement-mode MOSFETs and BJTs are common semiconductor devices that can be used to build self-excited interleaved parallel Flyback converters. When applied to low-voltage input applications, enhancement-mode MOSFETs are not suitable due to their high gate-source threshold voltage. A BJT with a lower base-emitter turn-on voltage is suitable, but has higher drive and conduction losses. Contents of the invention [0003] In order to overcome the disadvantag...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 何国锋陈怡
Owner HENAN UNIV OF URBAN CONSTR
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