JPS61161968A - Rectifying circuit device - Google Patents

Abstract

PURPOSE:To simplify a circuit configuration by providing a thyristor at part or all as AC input signal rectifying means, starting supplying an AC input signal and then controlling the thyristor after the input voltage becomes near OV. CONSTITUTION:Thyristors 1, 3 are used at part of all to rectify an AC input signal. If the level of the voltage waveform at a point A is high when a power source switch is ON, a transistor 12 becomes ON, and a point D accordingly becomes low, and the thyristor 1 remain OFF. Accordingly, no charging current C flows. Then, if the voltage at the point A becomes near OV, the transistor 12 becomes OFF, the gate current of the thyristor 1 flows through resistors 8, 9, a capacitor 13 and the thyristor 1 so that the thyristor becomes ON, and a charging current C flows.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a rectifier circuit device that rectifies an AC input signal through a rectifier and further applies the signal to a smoothing capacitor to obtain a DC signal.

Overview of B-cutoff The present invention rectifies an AC input signal.In order to eliminate the instability at the input rise, a thyristor is used to perform the rectification. The circuit configuration of a conventional rectifier circuit device is shown in FIG. 2(a).
The signal waveform is shown in FIG. 2(b). In the conventional circuit shown in the figure, when the power switch 7 is turned on when the AC input voltage is high, the ON resistance of the rectifier diodes 1 to 4 is small, so the charging current of the smoothing capacitor 5 does not reach the 0 point. A sudden large current (surge current) may occur, leading to the destruction of diodes 1 to 4 and capacitor 5. In order to prevent this destruction, a rectifier circuit device as shown in Figure 3 (a) was conventionally used. Widely adopted. FIG. 3(b) shows the signal waveform. In the circuit shown in the figure, the photoelectric current to the smoothing capacitor 5 flows through the current limiting resistor 8 at the moment the power switch 7 is turned on, thereby protecting the diodes 1 to 4 and the capacitor 5. However, if the current is constantly passed through the resistor 8, voltage drop and power loss due to the resistor 8 will be a problem, so when the voltage at the 0 point increases, the thyristor 9 is turned on to bypass the current to the thyristor 9. 10-1
6 is a gate control circuit used for gate control of the thyristor 9. That is, when the voltage at the 0 point increases, the oscillation circuit 16 operates, and the AC voltage boosted by the coil 15 is transferred to the diode 13 and the capacitor 1.
1, and a voltage higher than the 0 point is induced at the 0 point, thereby turning the thyristor 9 on.

D0 Problems to be Solved by the Invention However, in the case of the circuit configuration shown in FIG. There are disadvantages such as the need to configure a circuit.

E1 Means for Solving Problems In order to solve the above-mentioned problems, the present invention includes a part or all of a thyristor as a rectifying means for an AC input signal, and furthermore, the AC input signal is supplied with a thyristor. The device is equipped with a gate control circuit that controls the gate of the thyristor and performs rectification operation only when the input voltage approaches Ov.

F. Embodiment FIG. 1(a) shows a circuit configuration of an embodiment of a rectifier circuit device according to the present invention, and FIG. 1(b) shows its signal waveform. In the figure shown in the figure, a thyristor 1.3 is used in place of some of the rectifying diodes in order to rectify the AC input signal.

If the level of the voltage waveform at the 0 point is high when the power switch is turned on, the transistor 12 is turned on, so the 0 point becomes Low, and the thyristor 1 remains OFF, so the charging current ◎ does not flow. Next, when the voltage at the 0 point becomes near 0V, transistor E2 turns OFF, and the gate current of thyristor 1 flows from 8→9−→13→1, and thyristor L
turns ON and charging current ◎ flows.

Since the charging current at this time rises later than the rise of the voltage at the 0 point, it does not become a surge current.

In case the phase at switch 08 is reversed, thyristor 3 and gate control circuits 16 to 23 (l and 8
Figures 4 and 5 show circuit configurations of other embodiments. Although FIG. 4 shows a half-wave rectifier circuit and the tJXs diagram shows a voltage doubler rectifier circuit, the circuit configuration is basically the same as that in FIG. 1.

G0 Effects of the Invention According to the circuit configuration described above, the gate control circuits 8 to 15 of the thyristor 1 and the gate control circuits 16 to 23 of the thyristor 3 can be configured with small current capacity circuits, and these circuits can be integrated. By converting the device into a single chip, the device component configuration can be simplified. Of course, it has the excellent advantage of not requiring a conventional anti-surge protection circuit.

[Brief explanation of the drawing]

FIG. 1(a) is a circuit configuration diagram of an embodiment of a rectifier circuit device according to the present invention, FIG. 1(b) is a signal waveform diagram thereof, and FIG.
a) and FIG. 3(a) are circuit configuration diagrams of a conventional rectifier circuit device, FIG. 2(b) and FIG. 3(b) are signal waveform diagrams thereof,
FIGS. 4 and 5 show circuit configuration diagrams of other embodiments of the present invention. In the figure, 1, 3: Rectifier thyristor 2.4: Rectifier diode 5: Smoothing capacitor 6: Load 7: Power switch 8-23: Gate control circuit (zero cross circuit 24) Agent: Patent attorney Aihiko Fukushi (2 others) j Shiba-gata (b) 1i111iJl&, IEIII (a) 83 Figure 4 Figure 5

Claims (1)

[Claims] 1. A rectifier circuit device that rectifies an AC input signal through a rectifier and further applies it to a smoothing capacitor to obtain a DC signal, comprising: b) a part of the rectifier as the rectifier; or all of them are equipped with thyristors, and c) are equipped with a gate control circuit that controls the gates of the thyristors and performs rectification operation only when the input voltage becomes near 0 V after the AC input signal begins to be supplied. Rectifier circuit device.