JPS5818473Y2 - Inverter device - Google Patents

Description

[Detailed description of the invention] This invention relates to an inverter device in which the circuit part on the semiconductor switch side and the circuit part on the inverter transformer side are arranged separately. It is related to.

In lighting equipment, etc., inverter devices may be separated and placed at each end of the equipment.

In this case, for example, as shown in FIG. 1, it is conceivable to separate the circuit portion on the semiconductor switch side and the circuit portion on the inverter transformer side to make the sizes approximately equal.

In Figure 1, 1 is a power supply, 2 and 3 are input terminals, 4 is a capacitor, 5 is a diode bridge, 6 is a capacitor, and 7
8 is an inductor, 8 is a semiconductor switch, and 9.10 is an output terminal of the circuit portion 11 on the semiconductor switch side.

Also, 12 is the circuit part on the inverter transformer side, and 13.1
4 is an input terminal, 15 is a resonant capacitor, 16 is an inverter transformer, and its secondary winding 17 is an output terminal 18.
．． It is connected to the load 20 via 19.

Furthermore, 21 and 22 are circuit parts 1 on the semiconductor switch side.
1 and the circuit portion 12 on the inverter transformer side.

In the case of such a circuit configuration, the equivalent circuit regarding the noise is as shown in FIG.

In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

Here, 30 represents the impedance between the inverter device and the ground of a disturbed device, such as a radio receiver, connected to the same line.

31 is a noise voltage generated by switching of the semiconductor switch 8, 32.33 is the inductance of the wiring 21.22, and 34 to 37 are distributed capacitances between the wiring 21.22 and the ground.

38 is a distributed capacitance between the semiconductor switch and the ground due to a heat sink provided for heat radiation of the semiconductor switch.

The equivalent circuit of FIG. 2 is further simplified and shown in FIG. 3.

In Fig. 3, if there were no inductance 32.33 of wiring 21°22, the noise between terminals 2, 3 and terminal 9 would be reduced by being divided by inductance 7 and capacitor 15, and this would reduce the distributed capacitance 34.38. to the jammed device.

However, in this case, since the inductances 32 and 33 of the connecting wires 21 and 22 are connected in series with the capacitor 15, the noise between the terminals 2 or 3 and the terminal 9 is not reduced much, but is added to the disturbed device. It will cause a lot of interference.

In order to eliminate the above-mentioned drawbacks, this invention significantly reduces noise with a relatively simple configuration by providing a noise reduction capacitor between the semiconductor switch and the inverter transformer and between the output lines of the circuit on the semiconductor switch side. The present invention aims to provide an inverter device that can reduce the amount of energy used.

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

In FIG. 4, 1 is a power source, one end of which is connected to terminal 2, and the other end connected to terminal 3.

A capacitor 4 is inserted between terminals 2 and 3, with terminal 2 being connected to one input end of a diode bridge 5, and terminal 3 being connected to the other input end.

A capacitor 6 is inserted and connected between the output terminals of the diode bridge 5, one of which is connected to the output terminal 9 via an inductor 7 and a semiconductor switch 8, and the other is connected to the output terminal 1.
0 respectively.

Reference numeral 11 surrounded by a broken line indicates a circuit portion on the semiconductor switch side.

A circuit section 12 on the inverter transformer side is provided separately from this, a resonance capacitor 15 and an inverter transformer 16 are connected in parallel between input terminals 13 and 14, and a secondary winding 17 of the inverter transformer 16 is connected to an output terminal 18. .19
It is connected to the load 20 via.

Connection lines 21 and 22 connect circuit portion 11 on the semiconductor switch side and circuit portion 12 on the inverter transformer side.

In particular, this inverter device connects the noise reduction capacitor 40 between the output lines of the circuit section 11 on the semiconductor switch side, that is, the section from the switch 48 to the terminal 9, and the section from the negative output terminal of the diode bridge 5 to the terminal 10. Insert and connect to.

An equivalent circuit related to the noise in FIG. 4 is shown in FIG. 5.

In FIG. 5, the same parts as in FIGS. 2 and 3 are indicated by the same reference numerals, and the explanation thereof will be omitted.

As is clear from FIG. 5, the noise generated between the terminals 2, 3 and the terminal 9 is reduced by being divided by the inductance 7 and the capacitor 40 exhibiting low impedance, and the noise is reduced through the distributed capacitance 34, 38. Since it is added to the device, its influence can be significantly reduced.

FIG. 6 shows an embodiment of the present invention that further embodies this, and the same parts as those in FIG. 4 are designated by the same reference numerals and the explanation thereof will be omitted.

In Fig. 6, 41.42 is a switching transistor, 43.44 is a resistor, 45 to 49 are output terminals, and 50 to 49 are output terminals.
54 is an input terminal, 55 is a base winding, and 56 is a primary winding.

In the embodiment shown in FIG. 6, the noise reduction capacitor 4
0 also serves as a resonance capacitor.

Transistor 41 of circuit portion 11 on the semiconductor switch side.
42 is turned on and off alternately, thereby generating a required AC output to the secondary winding 17 of the inverter transformer 16.

The on/off period of transistors 41 and 42 is the reciprocal of the resonant frequency determined by capacitor 40 and primary winding 56 of transformer 16.

In this embodiment, since the noise reduction capacitor also serves as the resonance capacitor, there is an advantage that noise can be reduced without increasing the number of parts.

Note that this invention is not limited to the embodiments and examples described above, and can be implemented with various modifications without changing the gist.

For example, the semiconductor switch is not limited to transistors, and SIRISK can also be used.

Further, the inductor provided in series with the semiconductor switch may be omitted depending on the case.

Further, in the embodiment shown in FIG. 6, the noise reduction capacitor and the resonance capacitor are shared, but of course they may be provided separately.

As described above, according to this invention, the circuit part on the semiconductor switch side and the circuit part on the inverter transformer side are arranged separately, and a noise reduction capacitor is inserted between the semiconductor switch and the inverter transformer. By providing a capacitor between the output lines of the circuit on the semiconductor switch side, it is possible to provide an inverter device that can significantly reduce noise with a relatively simple configuration.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an example of an inverter device that is the premise of this invention, FIGS. 2 and 3 are noise equivalent circuit diagrams of this device, and FIG. 4 is a configuration of an embodiment of this invention. 5 is a noise equivalent circuit diagram of the same embodiment,
FIG. 6 is a circuit diagram of an embodiment embodying this invention. 1...Power supply, 2,3...Input terminal, 4
... Capacitor, 5 ... Diode bridge, 6 ... Condenser, 7 ...
・Inductor, 8...Semiconductor switch, 9, 1
0...Output terminal, 11...Circuit part on the semiconductor switch side, 12...Circuit part on the inverter transformer side, 13゜14...Input terminal, 1
5... Resonance capacitor, 16... Inverter transformer, 17... Secondary winding, 18.
19...Output terminal, 20...Load, 2
1.22... Connection wire, 40... Capacitor for noise reduction.

Claims (2)

[Scope of utility model registration request] (1) A circuit part on the semiconductor switch side and a circuit part on the inverter transformer side are arranged separately, and noise reduction is provided between the semiconductor switch and the inverter transformer and between the output line of the circuit on the semiconductor switch side. An inverter device characterized by being provided with a capacitor. (2) Utility model registration claim 1, characterized in that the above-mentioned noise reduction capacitor also serves as a resonance capacitor.
Inverter device described in section.