JPS5858874A - Transistor inverter - Google Patents

Abstract

PURPOSE:To enable to continuously oscillate by provided a base drive transistor for controlling a current from a DC power source and supplying the base current of the transistor with the divided voltage of a voltage divider for pulsating power source voltage. CONSTITUTION:A voltage from an AC power source 1 is rectified by a rectifier 2, becoming a pulsating voltage waveform, and is applied to an inverter main circuit having an oscillating transformer 10 and transistors 8, 9. The output of a voltage divider 3 supplies a current to the base of a base drive transistor 5, and a DC power source 4 flows a base current through the collector and emitter of the transistor 5 and a resistor 6 to the transistors 8, 9. A starting auxiliary resistor 7 is inserted between one end of the output of the rectifier 2 and the resistor 6. With this structure, continuous oscillation is enabled even when the power source voltage is pulsating voltage thereby reducing the beat of the transformer.

Description

[Detailed Description of the Invention] The present invention (σ; effective for converting the T to the Yako City @ all-clear frequency source is also σ). If you use capacitors, chokes, etc. to eliminate the 11R pulse component as much as possible, and use the 0 pulse flow that was closed to the inverter input as an IU flow, it will cause a pause period in the power supply voltage that occurs when the voltage rises. However, oscillation delays occur, causing beats in the oscillation transformer, overcurrent in the collector current of the transistor, etc., and countermeasures against these problems have been difficult.

The present invention is to enable continuous oscillation with a pulsating voltage without using a large capacity capacitor or choke.

In the present invention, a pace drive transistor is provided to control the current flowing out from a DC power supply for supplying base current, and the voltage is divided by a voltage divider that divides the total voltage of the pulsating power supply voltage, and the divided voltage is used to transform the pace drive transistor. By supplying base current to the inverter, the rise time of the inverter's oscillation is accelerated, allowing continuous oscillation.

FIG. 1 shows a basic embodiment. According to Fig. 1, the voltage of the AC power supply 1 is rectified by the rectifier 2 to become a pulsating voltage waveform of vl in Fig. 2, and when this voltage is applied to the inverter and the inverter oscillates, the voltage is sufficient. , the output voltage of the voltage divider 5 becomes larger than the voltage of the current power supply 4, a pace current is supplied to the pace drive transistor 5, and a sufficient voltage is supplied from the DC power supply 4 to the transistors 8 and 9 through the resistor 6. A base current of ~ is supplied and continues to oscillate. As for the DC power supply voltage, when the output voltage of the voltage divider 3 becomes smaller, the current flowing through the base drive transistor 5 also becomes smaller, and the collector current also becomes smaller. ■,
When the voltage becomes 0, transistor 8 and transistor 90
The base current becomes 0 and oscillation stops. When the v1 voltage gradually increases, the base current supplied to the transistors 8 and 9 through the starting auxiliary resistor 7, the base drive transistor 5, and the resistor 6t- gradually increases. When the voltage V8 rises, the base current supplied to transistors 8 and 9 becomes unsaturated, and as the paste tJLtlf increases, the state shifts to saturation, so that a small amount of current in the excavation transformer 10 Due to unbalance or unbalance between transistors 8 and 9, one of the transistors will rapidly saturate, causing the inverter to fail.

Therefore, oscillation starts quickly and continuous oscillation is possible.

V at this time.

The corresponding voltage waveform is shown in Fig. 2, and the waveform of the current corresponding to Ib and the collector current Ic of the transistor 8 is shown in Fig. 3.

Next, an embodiment will be described in which a choke is provided at the input of the inverter.

According to FIG. 4, the inverter has a resonance capacitor 21
, transistor 8. is synchronized with the resonant voltage of the oscillation transformer.
9 are alternately conductive and oscillate. At this time, a choke 22 is provided to make the input current of the inverter stable z5, but it is not necessary to have a large capacity to smooth the power supply.The divided voltage of the voltage divider 5 consisting of resistors 14 and 15 A base current is supplied to the pace drive transistor 5, and a resistor 1
6. The current from the DC power supply 4 consisting of capacitors 17 and 18 and diodes 19 and 20 is passed through the resistor 12. In the present invention, an example has been shown in which the 1IIL power supply is taken from the output transformer 1o, but the DC power supply is obtained by supplying the base current to the transistors 8 and 9 through the collector current of the transistors, the -power supply voltage, etc. You can take it. Direction of the invention
Since the i-low is high-rise and the DC voltage is obtained by rectifying the voltage,
The diodes 19 and 20 need to be for high-speed switching, and since there are few large-capacity ones, the diodes are likely to be damaged by the inrush current of the capacitor. A friend to solve this problem, resistor 161 is connected in series with capacitor 17.
r: connected, and the capacitor 18 may be several thousand picofarads 8 degrees.

The capacitor 13 has the effect of slightly delaying the rate of fall of the base current, and the voltage button of the base @ line 23 is used to prevent damage to the emitter of the base drive transistor 50 and at the same time to provide an appropriate pace drive current. belongs to.

As described above, the present invention enables continuous oscillation even when the power supply voltage is pulsating, and reduces transformer beats and the like.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a basic embodiment of the inverter of the present invention, Fig. 2 and Fig. 3 are waveform diagrams of the m1 and IPl paths, and Fig. 4 is a circuit diagram of another embodiment. 1 is AC power supply, right: I marine current, voltage divider in B, direct to 4? t
Vla, 5 is a base dry R41 transistor,
6 is a resistor, 7 is a starting auxiliary resistor, 8.9 is a transistor,
10 is an oscillation transformer, 11.12 is a resistor, 13 is a capacitor, 14. 15. 16F, r resistance, 17°18
is a capacitor, 19.20 is a diode, 21 is a mutual support capacitor, 22 is a choke, 25 is a pace winding,
Ruru.

Claims (1)

[Claims] Rectifying AC power supply 1 [, is it a pulsating current? Chikugen and (7,
An oscillation transformer, an oscillation transistor that alternately supplies current to the oscillation transistor, and a +FF door power source that supplies the oscillation transistor with a bene gas. In a push-pull type transistor inverter, there is a method for controlling the current flowing out from the surface clear angle source.
− second pace drive transistor and i f′ pulsating current i
'divide the pressure. ';) - Voltage generator and voltage divider 1 and voltage divider 1.
/r pace 1゛ura f! ′: Featuring seven holes and a hole transformer inverter.