JPS59220080A - Starting circuit of high frequency inverter - Google Patents

Abstract

PURPOSE:To perform the reduction in the size and cost of a high frequency inverter by commonly using as a reactor for suppressing a current of a starting circuit a reactor for suppressing the current of an inverter main circuit power inverter. CONSTITUTION:A terminal C1 of a starting circuit C is connected to one output terminal A1 of a power inverter 30, and a terminal C2 is connected to a thyristor 34 and a reactor 38 of the other output terminal side of the inverter 30. Thus, the reactor 38 is commonly used as the reactor for suppressing the current of the starting circuit and the reactor for suppressing the current of a power inverter. When a thyristor 55 is fired, the discharging current of a capacitor 52 is flowed through a load 40, the reactor 38 and the thyristor 55, and the rise is suppressed to the reactor 38.

Description

[Detailed description of the invention] The present invention relates to a starting circuit for a high frequency inverter.

A conventional starting circuit of this type is shown in FIG. In the figure, A is an inverter main circuit, and B is a starting circuit. 10 is a forward converter, 20 is a DC reactor, 30 is an inverse converter, 3
1 to 34 are sirisks, 35 to 38 are current suppressing glue handles, and 40 is a single-phase load (tank circuit). The starting circuit B includes a starting power source (rectifier) 51, a capacitor 53 charged from the starting power source via a current limiting resistor 52, a starting thyristor 55 inserted between the capacitor and the output terminal of the inverter 30, and a thyristor. 54 thyristors 55
A current suppressing glue handle 54 is inserted in series with the .

In this configuration, when starting the inverter main circuit A, the starting thyristor 55 is ignited to discharge the charge energy of the capacitor 53 as starting energy to the load 40, generating a voltage across the load 40 and starting it. The reactor 54 serves to suppress the rise of the capacitor current at this time. Therefore, when the reactor 54 has a large inverter capacity, the reactor 54 becomes large, which causes a significant increase in the price of the inverter device.

This invention was made in view of the above-mentioned problems, and by making the current suppressing reactor of the inverter main circuit inverter share the current suppressing reactor of the starting circuit, the inverter device can be made smaller and lower in price. The purpose of the present invention is to provide an inverter starting circuit that can realize the following.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the starting circuit C is connected to the glue handle 5 in FIG.
4, the circuit terminal CI is connected to one output terminal AI of the inverter 30, and the other circuit terminal C2 is connected to the inverter 3
Thyristor 34 and reactor 3 on the other output terminal side of 0
By being connected to the connection point B, the reactor 38
are shared. The other configurations are the same as those in FIG. 1, and are therefore designated by the same reference numerals.

In this configuration, when the thyristor 55 is ignited, the discharge current of the capacitor 52 flows across the load 40 as shown by the dotted line in the figure.
It flows through the reactor 38 and the thyristor 55, and its rise is suppressed by the axle 38.

As described above, according to the present invention, by arranging the configuration in which the capacitor discharge current of the starting circuit flows through one of the axles of the inverter, it is possible to omit the aqueduct that was conventionally dedicated to the starting circuit. , the inverter device including the starting circuit can be made smaller and cheaper than the conventional one.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a conventional startup circuit for a high-frequency inverter.
FIG. 2 is a circuit diagram of an embodiment of a starting circuit for a high frequency inverter according to the present invention. In the figure, 30-inverter, 31-34-silisk, 35-38-reactor, 51-starting power supply, 52-capacitor, 53-resistor, 55-silisk. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] In a starting circuit that supplies starting energy to an inverter load, the starting circuit includes a capacitor, a charging circuit for the capacitor, a silicate for controlling discharge of the capacitor, and a current suppressing glue handle connected in series with the silisk, and the inverter's main circuit is inverted as the reactor. An inverter start-up circuit characterized by sharing an axle in series with a converter's sirisk.