JPS5932261A - Power supply circuit - Google Patents

Abstract

PURPOSE:To extend the operational range of a power supply voltage, by applying start pulse to a gate electrode of a silicon controlled rectifier element, in the power supply circuit using the silicon controlled rectifier element. CONSTITUTION:A DC input voltage B1 is led to a DC power supply input terminal when a power supply switch 39 is turned on. When the divided and decreased voltage is higher than a switching voltage of a silicon bidirectional switching element 44', the switching element 44' turns on, the silicon controlled rectifier element 13 turns on, a DC output voltage B2 is increased and starts a horizontal output circuit 14 and the like at the rated voltage. Then, since an output of a start pulse supply circuit 26 is held to a value sufficiently lower than the gate voltage of the rectifier element 13, there exists no effect to the silicon controlled rectifier element 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply circuit using silicon-controlled rectifying elements used in television receivers and the like.

Conventional structure and its problems Conventionally, this type of tortoise removal circuit v1'T has been structured as shown in FIG. Four diodes (2) (3) (4) (5) and a capacitor (6) from the AC power input terminal (1)
A controlled DC input voltage Bl [unstabilized DC human power tl pressure] is supplied to the DC galvanic input terminal (8) through a rectifier and smoothing circuit (7) consisting of ((Primary winding θQ1 horizontal output drance 0υ
The DC output voltage B2 is applied to the anode of the silicon-controlled rectifying element θ4 through the tertiary winding θ of the horizontal output circuit θ
It adds to the beauty.

Here, the horizontal output circuit 041 includes a horizontal quadrence (in addition to 1υ, a horizontal output transistor QQ, a tamper diode θQ1, a resonant capacitor Oη, a diode for absorbing abnormal pulses, a resistor OQ1, a capacitor a), a horizontal deflection coil c! It consists of V and a 5-character correction capacitor (A). In addition, (c) is a starting pulse supply circuit when using a silicon-controlled rectifier, which is constructed by connecting the anode of a diode 1411 to the anode of a constant 1u voltage diode (a), and the cathode of a constant fl (voltage diode 144I+) Connected to the DC power input terminal (3) and connected to the diode [
The υ cathode is connected to the gate m pole of the silicon controlled rectifier (1,1. In addition, silicon controlled rectifying element 0)
The cathode of fLE, ie, the output terminal (c) of fLE, is grounded via a capacitor (1) and connected to the DC m source input terminal (connected to 1) via a resistor (ell+). One end of the secondary winding 0z of the choke 1 lance (9) is connected to ground 1 through a tie gate, and the other end is connected to the source output terminal 11. Direct current led to power output terminal 4? Voltage B2 is applied to resistor l341. The voltage is stepped down and stabilized by a constant 1U diode (to) and a capacitor (2), and is supplied from the nL source supply terminal (C) to the error detection phase control circuit (BS). When the switch 1) is closed and the human power alternating current 5IE voltage is supplied to the rectifying and smoothing circuit (7), the rectified and smoothed controlled DC input voltage B is input to the DC power input terminal (8).
is derived, and this controlled part flowing person cuff π pressure B is the primary winding 0 (kura, horizontal output l-lance 0) of the pulse transformer (9).
Tertiary winding θ2 of υ and silicon control 11BI JR
The voltage is stabilized at the power supply output terminal 11 DC, the output voltage B2 is derived from this DC output '18. ) -1:n2 is the horizontal output circuit When supplied to 041, the voltage is stepped down through the resistor M to 1 (1), and then to the error detection 6 phase phase θ (1 circuit (c)) (Ji, introduced 11).

When the electric juice switch is turned on, first, the starting pulse supply circuit h1;1ψ is operated and the silicon controlled rectifier
．． A starting pulse is supplied to the first gate.

This triggers the silicon control element 0 and turns it on, and connects the -1 source input terminal (8) to the winding (l()) of the choke transformer (0) and the horizontal output quadrature θ.
Capacitor G11l is charged via the 8th winding Oa of υ. When the capacitor shaft is charged to a certain voltage,
The horizontal output circuit (J4) starts the horizontal deflection operation, the error detection phase control circuits also become ready for operation, and the horizontal output circuit 09 starts to operate completely.

In the conventional circuit explained above, and (''flow 112 city times bv, (
7) and the gate of the silicon-controlled rectifying element θ, set up the starting pulse fIt supply circuit c7 (ν), and when the power switch (3) is turned on, the direct current is turned off and the human power y seat (8) I is measured. (+lI direct/>if: input terminal B.

is derived, and the silicon constraint 1 generalizing element 0. If the DC output voltage derived to the cathode of the dye is 1 to 7, and the Zener 1u pressure of the constant voltage 1 - diode (40) is El, then 13.
-B, when Ez is reached, constant voltage diode 4 and diode (4I) become conductive, and the starting pulse supply circuit W operates.
Silicon ζ1,11 sum (I IIK, driftwood, child 01 turns on and DC output voltage B.

The horizontal output circuit (14'
) etc.

However, this type of conventional circuit operates with a constant 7 Ci voltage diode Zener 1 u voltage ILl.
Therefore, if the 7a source m pressure becomes higher than the rated value, B,
−El, > 132 ・・・・・・・・・ω
In such a relationship, the silicon-controlled rectifying element 03 is turned on regardless of the operation of the error detection phase control circuit (to). Therefore, it is necessary to select a high value for Zener's J pressure EZ9. On the other hand, if the pressure becomes lower than the rated value during sleep Z1, the starting I+,? pressure for oscillation start is Bl 132 , > El・・・・・・・・・
The relationship such as () must be satisfied, and
If the ner voltage 1i2 is selected to a high value, the oscillation will not start when the voltage is lower than 1.
A problem will occur. in this way? 7. 'Last 1iil
fI! At 1"+, constant IHj, silicon diode (4I# Zener fil pressure I, etc., 1tLlII
The drawback was that the usage range of the JN voltage was narrow.

purpose of invention The present invention solves the above-mentioned conventional drawbacks.

To provide a product with a wide usable range of source voltage teL4
target

Structure of the Invention The power supply circuit of the present invention is configured to stabilize the controlled DC input voltage derived to the DC power input terminal using a silicon-controlled rectifier tIIF, Zl, and a starting pulse of the silicon-controlled rectifier. As a coupling circuit, the controlled DC input voltage is directly stepped down by a dividing resistor, and the midpoint of the dividing resistor is connected to a silicon bidirectional switching element with one end grounded.
I) NP l・
The base of the transistor is connected to the other end of the silicon bidirectional switching element, and the diode is connected from the collector of the transistor in the l1irj direction. 4. It is characterized by supplying a starting pulse to.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 8.
The explanation will be based on r. tA, the same symbol is used for items similar to those in Figure 1441 (I will omit the explanation with a J key).

The starting pulse supply circuit (2(
The sum is 4p'+L'v1 as follows.

In Fig. 2, the output g of the rectifying and smoothing circuit (7) is connected to the DC input terminal (80, which is derived from 11).
The input pressure B, is divided and stepped down by the dividing resistor 142 and (transition), and the numerator; One end is connected to the other end of a silicon bidirectional switching element (hereinafter referred to as SBS) which is grounded.

Also, at the midpoint of dividing resistors 1<2 and 03, PN, I'
) The emitter of transistor +41'9 is connected, PNP
) The base of the transistor decoy is connected to the intersection of the current and blocking resistors 041 and 5BS (461), and the diode i4'fI is connected in the forward direction from the collector of the PNP transistor 14fQ, and the cathode of the diode @ is connected to the silicon-controlled rectifier element. It is connected to the gate ?1E4Th of 03, and constitutes a starting pulse supply circuit (c).

With this configuration, when the power switch Kizuna:) is turned on, the DC power input terminal (
8) DC input voltage B1 is derived tl, m voltage B3 divided and stepped down by dividing resistor @4 and [4 is 5I3S H
[When it becomes higher than the switching voltage VS of 9, SBS kn is turned on through the blocking resistor @shun, and the base current of PNP transistor 4 flows, so the PNP transistor 2 is turned on, and the diode 147I is turned on. A current flows to the gate electrode of the silicon-controlled rectifier 03 through the gate electrode of the silicon-controlled rectifier 03, and the silicon-controlled rectifier 03 is turned on, causing the DC output voltage B2 to rise to the rated value and activate the horizontal output circuit 04 and the like. Further, as shown in the characteristics of FIG. 3, the SBS f41 is an element having a characteristic that once it is turned on, it rapidly decreases to the on-voltage Vt and continues to maintain the on-state I'lj LE V□. The reason why an element with such characteristics is necessary is that the silicon-controlled rectifying element 0
The switching voltage VS of 5BS (9) needs to be a sufficiently high voltage for the gate voltage V6 standard of 1, but once the silicon controlled rectifier 0;1 is turned on, the error detection phase control circuit (c) This is to eliminate the influence from the starting pulse supply circuit (c) since the silicon-controlled rectifying element a1 is controlled by the gate pulse. The gate voltage of silicon controlled rectifier 03 is J at a minimum of 3 volts.
), SBS The switching voltage VS of the song is about 8 volts, and the on-voltage VT is 1.4 volts. II+ is retained Y
This is the A style.

Therefore, after the silicon-controlled rectifier a3 is turned on, the output of the starting pulse supply circuit is held at a value sufficiently lower than the gate voltage VC of the silicon-controlled rectifier αJ, so that it will never affect the silicon-controlled rectifier again. I won't give anything.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

Since the starting pulse supply circuit in the power supply circuit of the present invention operates based on the characteristics of a silicon bidirectional switching element, it has a narrow usable range of power supply voltage and is subject to power supply voltage regulations, which was a drawback of the conventional Zener voltage. It is possible to always perform a good starting pulse supply operation over a wide range without any trouble, and to start the horizontal output circuit etc. reliably and stably.

[Brief explanation of the drawing]

FIG. 1 is a conventional power supply circuit diagram, FIG. 2 is a circuit diagram of an embodiment of the power supply circuit of the present invention, and FIG. 3 is a static characteristic diagram of a silicon bidirectional switching element. (8)...DC TD source large input terminal Q...Silicon controlled rectifier, example...Starting pulse supply circuit, Foundation...
Game)! [pole, @2@unit...divided resistor, @tai...
Current blocking resistor, hri... silicon bidirectional switching element, decoy... PNP transistor, 1471...
・Diode agent Yoshihiro Morimoto Figure 1 Figure J

Claims (1)

[Claims] 1. The control DC input voltage applied to the DC m source input terminal lζ is configured to be stabilized and output using a silicon controlled rectifier, and as a starting pulse supply circuit for the ni minosilicon controlled rectifier, the circuit described in 011 is used. The controlled DC human pressure m is directly stepped down by a dividing resistor, and the middle point of the dividing resistor is connected to the other end of a silicon bidirectional switching element whose one end is grounded icomb'+f, I! 81, the emitter of the transistor is connected to the midpoint of the dividing resistor 1111, and the base of the transistor nIJ is connected to the other end of the silicon bidirectional switching element +jl; A Yu general 1 circuit in which a starting pulse is supplied to the gate electrode of the silicon-controlled rectifier by connecting the diode in the forward direction from the collector of the transistor.