JPS6425884U

JPS6425884U -

Info

Publication number: JPS6425884U
Application number: JP11820087U
Authority: JP
Priority date: 1987-08-03
Filing date: 1987-08-03
Publication date: 1989-02-14

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の配線図、第２図は
前記実施例の動作を説明するためのＰＵＴのゲー
ト電圧・アノード電圧の波形図、第３図は従来例
の配線図、第４図は従来例の第２図と対応するＰ
ＵＴのゲート電圧・アノード電圧の波形図、第５
図は従来例における異常現象を示す図である。３……ダイオード、４……ツエナダイオード、
５……起動用コンデンサ（コンデンサ）、６…
…スイツチ回路、７……ＰＵＴ、８……トランジ
スタ、９……平滑用コンデンサ（コンデンサ）
、１０……ＰＷＭ制御回路、１１……トランジス
タ、１３……主コイル、１４……副コイル、２０
……ツエナダイオード、２１，２２……抵抗、２
３……トランジスタ、１００……起動回路、１０
１……主変圧器、１０２……帰還信号。 Fig. 1 is a wiring diagram of an embodiment of the present invention, Fig. 2 is a waveform diagram of the gate voltage and anode voltage of PUT to explain the operation of the embodiment, Fig. 3 is a wiring diagram of a conventional example, and Fig. 3 is a wiring diagram of a conventional example. Figure 4 corresponds to Figure 2 of the conventional example.
UT gate voltage/anode voltage waveform diagram, 5th
The figure is a diagram showing an abnormal phenomenon in a conventional example. 3...Diode, 4...Zena diode,
5... Starting capacitor (capacitor), 6...
...Switch circuit, 7...PUT, 8...Transistor, 9...Smoothing capacitor (capacitor)
, 10...PWM control circuit, 11...transistor, 13...main coil, 14...sub-coil, 20
...Zena diode, 21, 22...Resistor, 2
3... Transistor, 100... Starting circuit, 10
1... Main transformer, 102... Feedback signal.

Claims

[Scope of utility model registration request]

To start the separately excited switching regulator, charge the starting capacitor and use the PUT (programmable unidirectional transistor).
A startup circuit that transfers the electric charge to a smoothing capacitor on a power line of the PWM control circuit through a switch circuit controlled by turning on and off, generates a voltage in the smoothing capacitor, and applies the voltage to the PWM control circuit as a power supply voltage. In order to determine the gate potential of the PUT, the smoothing capacitor voltage (P
By connecting the wires so that the power supply voltage of the WM control circuit is applied, and by connecting a Zener diode in parallel to the starting capacitor to suppress the upper limit of the voltage rise, the charge in the starting capacitor can be reduced at the beginning of startup. After the transfer, the PWM control circuit operates to ensure that the PUT gate potential is always higher than the anode potential, and a means is provided to discharge the charge in the startup capacitor when the switching regulator is turned off. Features a starting circuit.