JPS58190278A - Inverter device - Google Patents

Abstract

PURPOSE:To reduce the number of parts by converting the output signal of a control circuit into a light, transmitting the light through an optical fiber and introducing the light into a photoelectric element which is provided in a switching circuit. CONSTITUTION:The output signals of a control circuit 4 are converted into lights via light emitting elements 4a, which are incident to optical fibers 5 to be transmitted and outputted into the photoelectric elements 2c of a switching circuit 2, voltages are outputted in response to the lights via the elements 2c, and switching elements 2a are switched in response to the voltages. 3-phase AC voltages which have delays of 120 deg. are outputted to the connecting points of various switching elements 2a and hence output terminals 3 by the switching operation. In this manner, since a drive circuit and a power source circuit which are required in case that photoreceptors are heretofore employed can be eliminated, the number of parts can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inverter device that converts a DC voltage into an AC voltage (KW).

Generally speaking, an OIL inverter device is a switch that connects a pair of switching elements in series, applies a DC voltage, and uses the connection point of the switching elements as an output terminal.

The switching circuit and this switching element are operated alternately, and the switching circuit and the control circuit are connected by a 7-way cable that connects the light-emitting element and the light-receiving element. was.

In the above case, since a light-receiving element is used, it is necessary to detect the position with the KFi light-receiving element that operates the switching element and convert it into an electrical signal, which requires a switching element drive circuit. is 4IP- and
Since the switching elements are connected in series, the M number that controls this switching element must have an independent reference voltage, so the Dennoodle circuit that supplies t#A to the drive @ circuit is also essential. , increasing the number of parts.

If you want to remotely operate this inverter device, use W-
A part or all of the control circuit has been led out to the outside using the conventional method, but since the transmission is based on electrical signals, it is difficult to receive noise.
There was a risk of g movement.

In view of the above-mentioned disadvantages, the present invention aims to reduce the number of parts and reduce 114m production due to noise.
It is.

The present invention will be described below as an embodiment based on nine drawings. 1 is a rectifying and smoothing circuit that outputs a DC current, and rectifies a three-phase AC voltage through rectifying elements 1m... It is smoothed via a w-coil lb and a smoothing capacitor le. Of course, the input voltage may be a single-phase AC voltage. 2 is a switching circuit, in which a circuit in which a pair of switching elements ga and ga are connected in series is connected in parallel with a smoothing capacitor tctc of a rectifying and smoothing circuit l, and outputs the III connection point of each set of switching elements gm and gm. Terminal 8... Closed. This switching element
There is an input resistance for the input of...! ! A photoelectric element IC that converts light into voltage is connected via b... still,
In the embodiment, switching element 2... is MO
Using 8Fg'I', optical Vt cable 2C...li V1
7-con photoelectric element (generally thick 1iIlt).

There is no particular limitation as to whether the Also, the photoelectric element 4cm...K is a resistance as its load! d...
・are connected in parallel. 4... is a control circuit,
It outputs a signal that alternately operates each pair of switching elements C, and the electrical signal is converted into light by the light emitting elements 4 and output.

6... is an optical fiber that connects the control circuit 4 and the switching circuit, and receives light from the light emitting element 4 [... of the control path 4] and transmits it. The light is emitted to the photoelectric element IC of the switching circuit 8.

To explain this, the output signal f of the control circuit 4
is the symbol “l a +b) a +
c) alci) , t@) , if) K As shown, the 12o0 delay is also nine.
ICI, tel output signal and this symbol 1ml *
lc) The symbol fbl opposite to the output g1 of e(-),
ldl, (which is the output signal of fl, and this symbol information) and the output signal of (b) are connected in series to the first set,
The output signals of symbols ([) and +d) are connected in series, and the output signals of symbols (e) and Connect the third set in series and make nine sui.

Ching element ha! 1r (corresponding to this, the output signal of the control circuit 4 is converted into light by the light emitting element 4 [... and enters the optical fiber 6..., and this light is transmitted to the photoelectric element 2c of the switching circuit 2). ... is emitted, the light element !cW- outputs a voltage corresponding to the light, and in response to this voltage, the switching element 9... performs a switching operation. Through this switching operation, each set of Connection #11 of switching cable C...: L, that is, t to output terminal 8... Symbol Igl, fh in Fig. 2
) and l, each outputs a three-phase AC voltage with a 120° delay.

In the embodiment, if the output voltage is a three-phase AC voltage, three series circuits of switching elements I... are installed, but when outputting a single-phase AC voltage, three series circuits are installed. In addition, if you want to output a single-phase AC voltage by inputting two DC voltages, use a switching element! It is sufficient to use only one series circuit of a..., therefore, the number of series circuits is not limited to -1.

Thus, in the present invention, the control circuit 4 is provided with a light emitting element 4 that converts an output signal into light, and the light from the light emitting element is transmitted through an optical fiber that connects the switching circuit type and the control circuit 4. 6..., this optical fiber 6...
The photoelectric element 2C... which converts the transmitted light into a voltage and inputs it to the switching element 21... is required in the switching circuit 2VC, so it is necessary when using a conventional light receiving element. Since the drive circuit and the power supply circuit are not required, the number of parts can be reduced, and when performing remote control, the optical fiber 6 can be used as a transmission path, which reduces noise and reduces per-movement damage. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a concave M diagram showing one embodiment of the inverter device of the present invention, and FIG. 2 is a partial operational characteristic diagram of FIG. 1. l... Rectifier smoothing circuit, 2... Switching circuit, 2
Tortoise... switching element, 2c... photoelectric element, 8.
... Output terminal, 4. Control circuit, 4a. Light emitting element, G. Optical fiber. Patent applicant: Matsu F Electric Co., Ltd. Patent attorney: Satoshi Take, Maruhaka (8 persons)

Claims (1)

[Claims] 1) In an inverter device consisting of a switching circuit that connects a pair of O switching elements in series to apply a DC voltage, and uses the connection point of this switching element as an output terminal, and a control circuit that alternately operates the switching elements. %
A light emitting element that converts an output signal into light is provided in the control circuit, and the light from this light emitting element is transmitted through an optical fiber that connects the switching circuit and the control circuit, and the light transmitted through the optical fiber is An input device characterized in that the switching circuit is provided with a photoelectric element that inputs the voltage Kf* to the switching element.