JPH03270644A - Supplied power regulating circuit - Google Patents

Abstract

PURPOSE:To supply a load with a constant electric power by a method wherein a triode AC switch is provided with a diode of parallel connection, a series body connected in series to the light receiving side element of a triode AC switch photo coupler and a pair of input terminals connected to the light emitting side of the same while an opening and closing switch is connected in parallel to the diode. CONSTITUTION:When a commercial AC power supply VAC is 100V, an opening and closing switch S is closed. When there is a signal VIN between signal input terminals 3, 4 a photo triode AC switch PT1 is put on by the light emission of a light emission diode LD1, a voltage is generated between both terminals of a resistor R1, a triode AC switch TRC is put ON and a load L is supplied with an electric power. When the polarity is opposite, the triode AC switch RTC is put ON and the load L is supplied with the electric power. When the commercial AC power supply VAC is 200V, the opening and closing switch S is opened. When the commercial AC power supply VAC is 200V, the load is supplied with the half wave of the AC power.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to industrial applications where the voltage of the commercial AC power supply is 200V even if the voltage is 100V.
However, it relates to a supply power adjustment circuit that adjusts the power to a constant level according to the load rating and supplies the power to the load.

[Prior art] Loads such as heaters and lamps connected to a commercial AC power source are
It is necessary to select one rated for a power supply voltage of 100V or 200V. For example, even if a power supply voltage of 100V is connected to a lamp for a power supply voltage of 20OV, sufficient light cannot be obtained due to insufficient power. Also, conversely, the power supply voltage 1
If a power supply voltage of 200V is connected to a lamp or heater for 00V, the lamp or heater, which is a load, may break due to excessive power, causing a failure of the load.

Therefore, the power supply voltage and load rating must match the design.

By the way, as a means to eliminate the above inconvenience, it is possible to manually adjust the supplied power by inserting a transformer or resistor between the commercial AC power supply and the load, or to operate a relay by detecting the power supply voltage. Measures have been taken to provide a control circuit that automatically switches the taps of the transformer to adjust the power supply.

[Problems to be Solved by the Invention] However, in the conventional means as described above, there is a first problem to be solved as follows.

(1) Loads with multiple types of ratings that match the power supply voltage must be prepared.

(2) In a control circuit that uses a transformer, a relay, etc. as a means for switching the power supply voltage, these parts are bulky, making it impossible to realize a compact device and also making it impossible to manufacture the device at low cost.

[Purpose of the Invention] The present invention has been made to solve the above-mentioned problems, and is capable of providing a constant amount of power to a load connected to a commercial AC power supply, whether the power supply voltage is 100V or 200V. It is an object of the present invention to provide a power supply adjustment circuit which can be manufactured at low cost with a small number of parts.

[Means for Solving the Problems] The power supply adjustment circuit of the present invention includes a pair of output terminals in which an AC power source and a load are connected in series, a triac connected between the output terminals, and a triac connected in parallel with the triac. It is equipped with one or two connected photocouplers and a switchable open/close switch.

[Function] The power supply adjustment circuit of the present invention operates by manually switching the on/off switch depending on the type of commercial AC power supply to be connected.
When the commercial AC power supply voltage is 100V, a full wave voltage is supplied to the load, and when the commercial AC power supply voltage is 200V, a half wave voltage is supplied, and as a result, approximately constant power is always supplied to the load, It is possible to get by with one type of rated load without having to prepare a type of load that matches the power supply voltage. Furthermore, since a complicated and bulky control circuit is not required and the single circuit configuration is simple, it can be manufactured at low cost.

[Example code] The present invention will be explained below with reference to the drawings.

FIG. 1 shows a circuit diagram according to a first embodiment of the present invention, and in particular, a block H indicated by a dashed-dotted line is a supply power adjustment circuit. A commercial AC power supply V is connected between output terminals 1 and 2 of this circuit.
The AC and load are connected in series. Commercial AC power supply VA
C may be either 100V or 200V.

On the other hand, this circuit has signal input terminals 3 and 4, and a signal vrN for supplying or stopping power to the load is input to the signal input terminals 3 and 4M from the outside. Further, between the signal input terminals 3 and 4, a light emitting diode LDI is connected as a light emitting side element of the photocoupler PCI as a series body of a protective resistor R3. The light receiving side of the photocoupler PCI has a series body of a phototriac PTI and a diode D1, and this series body is connected to the output terminal 1.
．． The two are connected in parallel.

Note that the polarity of the diode Di connected in series with the phototriac PTI is not limited to the illustrated direction, but may be reversed. A manually switchable open/close switch S is connected in parallel to this diode D1.

A triac TRC, which is a main switching element for turning on and off power supply to a load, is connected in parallel between output terminals 1 and 2. Further, a resistor R1 is connected between the main terminal and the gate of the triac TRC. Furthermore, the series body of capacitor C1 and resistor R2 is a triac T
They are connected in parallel between the main terminals of the RC, and function as a protection circuit for the triac TRC and photocoupler P'CI.

Next, the operation of the supply type/force adjustment circuit configured as described above will be explained in sections.

(1) Load between output terminals 1 and 2 and commercial AC power supply VAC
Connect with. Here, first, the operation when the voltage of the commercial AC power supply VAC is 100 cm will be explained.

Further, when the commercial AC power supply VAC is 100V, the on/off switch S is kept closed.

Therefore, when there is no signal VIN between the signal input terminals 3 and 4, the light emitting diode LDI of the photocoupler PCI does not emit light, so the phototriac PT1 is not turned on.

Therefore, from the commercial AC power supply VAC, the diode D1 or the on/off switch S and the phototriunk PT1. Since no current flows through the resistor R1 and no voltage is generated between the gate and cathode of the triac TRC, the triac TRC is not turned on.

On the other hand, when the signal 1N is present between the hexagonal signal terminals 3 and 4, the phototriac PTI is turned on by light emission from the light emitting diode LDI. As a result, commercial AC power supply VAC →
Load L → Output terminal 2 → Open/close switch S → Photo triump PTI → Resistor R1 → Output terminal 1 → Commercial AC power supply VA
Current flows in the closed circuit of C. Therefore, a voltage is generated across the resistor R1, the triac TRC is turned on, and power is supplied from the commercial AC power supply VAC to the load. Further, when the polarity of the commercial AC power supply VAC is reversed, current flows through a path opposite to the above, turning on the triac TRC, and power is similarly supplied to the load.

These relationships are shown in the column of commercial AC power supply VAC 100V in FIG. That is, when the commercial AC power supply VAC is 100V, the aftereffects of the AC flow through the load.

Next, the operation when the commercial AC power supply VAC is 200V will be explained. In this case, the open/close switch S is left open.

First, when there is no signal VIN between the signal input terminals 3 and 4, the triac TRC is not turned on, so no power is supplied to the load as described above.

Next, when the signal V I N is present between the signal input terminals 3 and 4, the following operation occurs.

That is, when the polarity of the diode D1 is connected in the direction shown in FIG.
When the polarity of C is positive (+) on the output terminal l side, commercial AC power supply VAC → output terminal → resistor R1 → phototriunk PT → diode Di → output terminal 2 → load L → quotient A current flows in the path of the AC power supply VAC, which generates a voltage across the resistor R1, causing the triac TR
C is turned on and power is supplied to the load. However, when the polarity of the commercial AC power supply VAC changes and the output terminal 2 side becomes positive (+), the direction of the diode D1 has the opposite polarity, so no current flows through the above path.

Therefore, no voltage is generated across the resistor R1, and the triac TRC is not turned on. These relationships are shown in the VAC2OOV column of FIG.

That is, when the VAC is 200V, a half wave of AC is supplied to the load.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the figure, a block H indicated by a dashed line is a supply power adjustment circuit, and this circuit is equipped with an output terminal 1.2 and a signal input terminal 3.4, as in the first embodiment. . Also, in this embodiment, the commercial AC power supply VAC (7) voltage is
Either 100V or 2oOV may be used.

Further, the signal IN for supplying or stopping power to the load is input from the outside between the signal input terminals 3 and 4, as in the first embodiment. Next, the power supply adjustment circuit of block H within the dashed line shown in the drawing includes a first circuit network 10, a second circuit network 11, a third circuit network 12, and a signal input circuit section 14. .

The first circuit network 10 includes a triac TRC which is a main switching element connected in parallel between the output terminals 1 and 2, and a resistor R connected between one main terminal and the gate of the triac TRC.
It consists of engineering and engineering.

Further, a series body of a resistor R2 and a capacitor c1 is connected in parallel between the main terminals of the triac TRC, and these function as a protection circuit for the triac TRc and photocouplers PC1 and PC2.

The second circuit network 11 is composed of a photothyristor THI, which is a light-receiving side element of a photocoupler PCI connected in parallel to the triac TRC.

The 313 circuit network 12 is composed of a photothyristor TH2 which is a light-receiving side element of a photocoupler PC2 connected in parallel to the triac TRC. The photothyristor TH2 is the photothyristor TH of the second circuit network 11.
They are connected in opposite polarity to I, and are connected in antiparallel to each other.

The signal input circuit section 14 has a resistor R between the signal input terminals 3 and 4.
3. The light emitting side element LD2 of the photocoupler PC2 and the light emitting side element LDI of the photocoupler PC1 are connected in series as shown. Further, an open/close switch S is connected in parallel with the light emitting side element LDI.

Next, I! of the present invention configured as described above! The operation of the power supply adjustment circuit according to the second embodiment will be explained.

First, the operation when the voltage of the commercial AC power supply VAC is 100V will be described. In this case, the open/close switch S is left open.

Now, when there is no signal VIN between signal input terminals 3 and 4, the light emitting side elements LDI and L of photocouplers PCI and PC2
D2 does not emit light and therefore the photothyristor THI
, T) (Both 2 do not turn on.

Therefore, the polarity of the commercial commercial current 9tVAC is set to output terminal 1.
2, no current flows through the resistor R1 through the photothyristors TH1 and TH2, regardless of whether the polarity is positive (+) or negative (-).

As a result, no voltage is generated across the resistor R1 and the triac TRC is not turned on, so no power is supplied to the load.

On the other hand, when the signal V r N is present between the signal input terminals 3 and 4, the photocoupler PCI and the light emitting side element LDI of PC2
, LD2 both emit light, and the photothyristors THI and TH
2 are both turned on, the triac TRC is turned on in both the positive and negative directions of the commercial AC power supply VAC, and power is supplied to the load. These relationships are shown in the column for VAC of 100V in FIG.

Next, the operation when the commercial AC power supply VAC is 200V will be explained. At this time, the open/close switch S is kept closed.

First, if there is no signal between signal input terminals 3 and 4,
As above, no power is supplied to the load. Next, when the signal V1 is present between the signal input terminals 3 and 4, the light-emitting side element LDI of the photocoupler PCI does not emit light because the open/close switch S is closed, and the photothyristor THI is not turned on. On the other hand, since the light emitting side element LD2 of the photocoupler PC2 emits light, the photothyristor TH2 is turned on. As a result, a half-wave current when the polarity of the commercial AC power supply VAC is positive (+) with respect to the output terminal 1 flows into the resistor R1 via the photothyristor TH2.

As a result, a voltage is generated across the resistor R1, the triac TRC is turned on, and power is supplied from the commercial AC power supply VAC to the load.

However, when the commercial AC power supply VAC is positive (+) with respect to the output terminal 2, the photothyristor TH2 has the opposite polarity, so no current flows through the resistor R1 and the triac TRC is not turned on.

This relationship is shown in the column of VAC200V in FIG.

As described above, the present invention has the following aspects. In the second embodiment, when the commercial AC power supply VAC is 100V, power is supplied to the load during both the positive and negative half-wave periods, and the commercial AC current [V
If the AC is 200V, power is supplied only during the negative half wave. As a result, by operating the on/off switch, substantially constant power is supplied to the load regardless of the voltage of the commercial AC power supply VAC.

Note that the photocouplers PCI・,P in the second embodiment
Photothyristors THI and TH which are light receiving side elements of C2
The two polarities may be configured to be opposite to each other. In this case as well, the same effect as in the above embodiment can be obtained only by reversing the current path. Furthermore, the open/close switch S used in the first and second embodiments may be replaced with a semiconductor element such as a transistor.

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained.

(1) The commercial AC power supply connected to the load is 100V, 20V.
Regardless of whether the voltage is 0V or not, substantially constant power can be supplied to the load by operating the on/off switch S.

(2) It is economical because it is not necessary to prepare different types of loads depending on the power supply voltage, and only one type of load is required.

(3) The number of parts is small, the circuit configuration is simple, the device can be downsized, and it can be manufactured at low cost without using an expensive control circuit.

[Brief explanation of drawings]

FIG. 1 is a supply power adjustment circuit diagram showing a first embodiment of the present invention, FIG. 2 is a supply power adjustment circuit diagram showing a second embodiment of the invention, and FIG. 3 is a diagrammatic representation of the operation in the circuit of FIG. 3 and FIG. 2; 1.2...Output terminal, 3.4...Signal input terminal, VAC...Commercial AC power supply, Load, TRC...Triac, PC2...Photocoupler, ...Phototriac, TH2...・Photothyristor, LD2...Light emitting diode, ・Diode, R2, R3...Resistor, ・Capacitor, ・Open/close switch. L・・・PCI. PTI・THI. L.D.I. Di・R1゜C1・S・・

Claims (1)

[Claims] 1. A pair of output terminals to which an AC power source and a load are connected in series, a triac connected between the output terminals, and a diode and triac photocoupler connected in parallel to the triac. A supply power adjustment circuit comprising a series body with a side element and a pair of signal input terminals connected to the light emitting side element of the triac photocoupler, and an on/off switch connected in parallel with the diode. 2. A first circuit network having a pair of output terminals to which an AC power source and a load are connected in series, a triac connected between the output terminals, and a first circuit network connected in parallel to the first circuit network. a second circuit network consisting of a light-receiving element of a photocoupler; and a second circuit network comprising a light-receiving element of a second photocoupler connected in parallel with the first circuit network, and the light-receiving element is connected to the first photocoupler. a third circuit network connected so that the polarity is opposite to the light-receiving side element of the first photocoupler, and a series body of the light-emitting side elements of the first photocoupler and the second photocoupler between the pair of signal input terminals; 1. A power supply adjustment circuit comprising: a signal input circuit section in which an open/close switch is connected in parallel to either one of the light emitting elements.