JP2507233Y2 - Supply power automatic adjustment circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an automatic supply power adjusting circuit for automatically adjusting and supplying a constant power according to the rating of a load regardless of the type of commercial AC power supply. Regarding

[Prior Art] It is necessary to select a load such as a heater and a lamp connected to a commercial power source, which has a rating corresponding to a power source voltage of 100V or 200V. For example, even if a power supply voltage of 100V is connected to a power supply voltage of 200V, a sufficient amount of light cannot be obtained. On the contrary, when the power supply voltage of 200V is connected to the lamp or heater for the power supply voltage of 100V, the lamp or the heater, which is the load, is disconnected, which may cause the failure of the load.

Therefore, the power supply voltage and load rating must be matched.

By the way, as a means to eliminate the above inconvenience, insert a transformer or a resistor between the commercial power source and the load to manually adjust the power supply, or detect the power source voltage to operate the relay to operate the transformer. The taps are automatically switched to adjust the power supply.

[Problems to be Solved by the Invention] However, the conventional means as described above have the following problems to be solved.

(1) It is necessary to prepare multiple types of rated loads that match the power supply voltage.

(2) In the case of using a transformer or a relay as a means for switching the power supply voltage, those parts are bulky and the device cannot be downsized.

(3) When the load is switched manually, the work is complicated and troublesome.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and provides a constant power to a load connected to a commercial AC power supply regardless of whether the power supply voltage is 100V or 200V. It is an object of the present invention to provide an automatic supply power adjusting circuit adapted to be supplied.

[Means for Solving the Problems] A supply power automatic adjusting circuit of the present invention has a pair of output terminals to which an AC power source and a load are connected in series, and a triac connected between the output terminals. A circuit network, a second circuit network including a light-receiving side element of a first photocoupler connected in parallel with the first circuit network, and light reception of a second photocoupler connected in parallel with the first circuit network. Consisting of side elements,
And, the element emits light according to a DC voltage of a rectifier circuit connected to an AC power source, and a third circuit network arranged so that the polarity is opposite to that of the light receiving element of the first photocoupler. The voltage detection unit including the light emitting side element of the third photo coupler, the light emitting side element of the first photo coupler and the second photo coupler between the input terminals, and the third side parallel to the light emitting side element. And an input circuit section to which the light-receiving side element of the photocoupler is connected.

[Operation] The automatic supply power adjustment circuit of the present invention supplies the full-wave voltage to the load when the commercial AC power supply voltage is 100V, and the half-wave voltage when the commercial AC power supply voltage is 200V. The load is always supplied with a substantially constant electric power, and it is possible to use only one kind of rated load without preparing a kind of load according to the power supply voltage.

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

FIG. 1 shows a circuit diagram according to the present invention. In particular, a block S indicated by a chain line is a supply power automatic adjusting circuit. This circuit has output terminals 1 and 2, signal input terminals 3 and 4, and voltage detection terminals.
It has 5 and 6.

The voltage detection terminals 5 and 6 are connected to both ends of the commercial AC power supply VAC. Further, the commercial AC power supply VAC may be either 100V or 200V.

On the other hand, this circuit has signal input terminals 3 and 4, and
A signal V _IN for supplying or stopping power to the load L is input between the two.

In the drawing, the automatic supply power adjustment circuit of the block S in the alternate long and short dash line includes a voltage detection unit 13, a first circuit network 10, and a second circuit network 11.
And a third circuit network 12 and an input circuit section 14.

Between the voltage detection terminals 5 and 6 of the voltage detection unit 13, a diode D
A full-wave rectifier circuit 15 consisting of 1, D2, D3 and D4 is connected,
Resistors R1 and R2 are connected in series to the positive (+) side output terminal of this full-wave rectifier circuit 15. Between the connection point of these resistors R1 and R2 and the negative (-) side output terminal of the full-wave rectifier circuit 15. A capacitor C1 is connected as shown in the figure.

A resistor R3 is connected between the (+) and (-) DC output terminals via resistors R1 and R2, and in parallel with this resistor R3, a Zener diode ZD and a light emitting side element LD3 of a photocoupler PC3 are connected in series. Are connected.

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 triac TRC.
It consists of a resistor R4 connected between one main terminal of RC and the gate. In addition, a series body of a resistor R6 and a capacitor C2 is connected in parallel between the main terminals of the triac TRC, which function as a protection circuit for the triac TRC and the photocouplers PC1 and PC2.

The second circuit network 11 is composed of a photothyristor TH1 which is a light receiving side element of the photocoupler PC1 connected in parallel to the triac TRC.

The third circuit network 12 is composed of a photothyristor TH2 which is a light receiving side element of the photocoupler PC2 connected in parallel to the triac TRC, and the photothyristor TH2 has a polarity opposite to that of the photothyristor TH1 and is antiparallel to each other. It is connected.

In the input circuit section 14, the resistor R5, the light emitting element LD2 of the photocoupler PC2, and the light emitting element LD1 of the photocoupler PC1 are connected in series between the signal input terminals 3 and 4 as shown in the figure. Further, a phototransistor T1 which is a light receiving side element of the photocoupler PC3 is connected in parallel with the light emitting side element LD1.

Next, the operation of the automatic supply power adjustment circuit configured as described above will be described in terms.

(1) Here, first, the voltage of the commercial AC power supply VAC is 100V
The operation when it is is described.

The load L and the commercial AC power supply VAC are connected between the output terminals 1 and 2, and the commercial AC power supply VAC is connected to the voltage detection terminals 5 and 6.

The direct current, which is the output from the full-wave rectifier circuit 15 including the diodes D1 to D4, is applied to both ends of the resistor 3, the Zener diode ZD, and the light emitting element LD3 via the resistors R1 and R2 and the capacitor C1. The voltage across resistor R3 is set as follows. That is, the commercial AC power supply VAC is 1
When the voltage is 00V, the resistance values of the resistors R1, R2 and R3 are set so as not to reach the Zener voltage of the Zener diode ZD. Therefore, in the above case, the commercial AC power supply VAC is 1
Since it is the case of 00V, no current flows through the Zener diode ZD, and as a result, the light emitting element LD3 of the photocoupler PC3
Does not emit light.

On the other hand, when the signal V _IN is input between the signal input terminals 3 and 4, the light emitting element LD2 of the photocoupler PC2 emits light. The light emitting element LD1 of the photocoupler PC1 also receives the signal V _IN
The light is emitted when is input. That is, photo coupler PC3
Since the light emitting side element LD3 does not emit light, the phototransistor T1 receives no light input and is in the off state, so that the signal V _IN is input to the light emitting side element LD1 and the element LD1 emits light. As a result, the photothyristors TH1 and TH2 of the photocouplers PC1 and PC2 are turned on when a voltage is applied from the commercial AC power supply VAC via the load L.

Therefore, if the output terminal 2 side becomes an alternating current + (this case is a positive half-wave), the output terminal 2 → the photothyristor TH
A current flows through the route of 1 → resistor R4 → output terminal 1, which causes a voltage to be generated across the resistor R4, which becomes the on-gate voltage of the triac TRC that is the main closing element, and the triac T4
RC turns on. When the TRIAC TRC is turned on, the main current flows from the commercial AC power supply VAC → load L → output terminal 2 → TRIAC TRC → output terminal 1 → commercial AC power supply VAC, and the load L
Predetermined power is supplied to.

When the output terminal 1 becomes + (negative half-wave in this case), the photothyristor TH2 is turned on, so that the triac TRC is turned on and power is supplied to the load L in the same manner as above.

When there is no signal V _IN between the signal input terminals 3 and 4, the light emitting side elements LD1 and LD2 do not emit light, whereby the photothyristors TH1 and TH2 remain off, and the triac TRC does not turn on. Predetermined electric power is not supplied to the load L. As described above, when the commercial AC power supply VAC is 100 V, the positive and negative full waves of AC flow to the load by the signal V _IN , and power is supplied.

(2) Next, the operation will be described when the commercial AC power supply VAC is 200V.

When the commercial AC power supply VAC is 200 V, the voltage across the resistor R3 of the voltage detection unit 13 becomes equal to or higher than the Zener voltage of the Zener diode ZD and the forward voltage drop V _F of the light emitting element LD3.
A current flows through the light emitting element LD3 of the photocoupler PC3, and the element LD3 emits light. In addition, the signal V _IN input between the signal input terminals 3 and 4 causes the light emitting element LD2 of the photocoupler PC2 to
Emits light.

Since the phototransistor T1 of the photocoupler PC3 is turned on by receiving the light input from the light emitting side element LD3, the current that should flow to the light emitting side element LD1 of the photocoupler PC1 is bypassed to the phototransistor T1. The element LD1 does not emit light. As a result, the photothyristor TH1 of the photocoupler PC1 does not turn on. On the other hand, the photothyristor TH2 of the photocoupler PC2 turns on. Therefore, when the commercial AC power supply VAC has a positive half-wave, the photothyristor TH1 is in the off state, so that no current flows through the resistor R4, and the on-gate voltage does not occur across the resistor R4. Triac TRC is not turned on.

Next, in the case of a negative half-wave, since the light emitted from the light emitting element LD2 is received and the photothyristor TH2 is on, a current flows through the resistor R4 as in the case of (1) above, which causes the triac TRC. Is turned on, and power is supplied to the load L only during the negative half-wave period. As a result, the main current does not flow during the positive half-wave period, and the current flows only during the negative half-wave period.

As described above, when the commercial AC power supply VAC is 100V, power is supplied to the load L for both positive and negative half-wave periods, and when the commercial AC power supply VAC200V is supplied only for the negative half-wave period, After all, the load L is supplied with substantially constant power regardless of the voltage of the commercial AC power supply VAC.

The photo-thyristors TH1 and TH2, which are the light-receiving elements of the photo couplers PC1 and PC2, may be configured so that their polarities are opposite to each other. In such a case, the same effect as that of the above-described embodiment can be obtained.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

(1) Regardless of whether the commercial AC power supply connected to the load L is 100V or 200V, it is possible to supply approximately constant power to the load, and disconnection occurs due to the difference in the power supply voltage of the power supply connected by mistake. It is possible to prevent load failures such as.

(2) It is economical because one kind of rating is sufficient without preparing a kind of load according to the power supply voltage.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an automatic supply power adjustment circuit showing an embodiment of the present invention. 1,2 …… Output terminal, 3,4 …… Signal input terminal, 5,6 …… Voltage detection terminal, 10 …… First circuit network, 11 …… Second circuit network, 12…
… Third circuit network, 13 …… Voltage detector, 14 …… Input circuit,
15 …… Full wave rectifier circuit, VAC …… Commercial AC power supply, L …… Load, TRC …… Triac, PC1, PC2, PC3 …… Photo coupler, LD1, LD2, LD3 …… Light emitting side element, TH1, TH2… … Photothyristor, T1 …… Phototransistor, ZD …… Zener diode, D1, D2, D3, D4 …… Diode, R1, R2, R3, R
4, R5, R6, ... resistors, C1, C2 ... capacitors.

Claims (1)

(57) [Scope of utility model registration request] 1. A first circuit network having a pair of output terminals to which an AC power source and a load are connected in series, and a triac connected between the output terminals; and a first circuit network connected in parallel with the first circuit network. A second circuit network composed of the light-receiving side element of the first photocoupler and a light-receiving side element of the second photocoupler connected in parallel with the first circuit network.
Third circuit network arranged so that the polarity is opposite to that of the light receiving side element of the third photocoupler, and the light emitting side element of the third photocoupler that emits light according to the DC voltage of the rectifier circuit connected to the AC power supply And a light-receiving side element of the third photo-coupler connected in parallel to one of the light-emitting side element of the first photo-coupler and the second photo-coupler and the light-emitting side element between the input terminal and the voltage detection section. And an input circuit section which is provided with the automatic supply power adjusting circuit.