JPS598032A - Phase control circuit of ac electric power using contactless transformer relay switch - Google Patents

Abstract

PURPOSE:To avoid a danger of an electric shock during control, by using a trigger element controlling circuit provided at the secondary low voltage side of a transformer to control the opening/closing of a contactless switching element which controls the application of AC power supply to a load. CONSTITUTION:A series circuit of a primary winding 2 of a transformer 1 and a gate voltage resistance 5 is connected in parallel to a contactless switching element A which opens and closes the application of an AC current source 3 to a load 6. At the same time, a series circuit of a changeover switch 7, a variable resistance 8, a resistance 9 and a capacitor 10 is connected to a secondary low voltage winding 4 of the transformer 1 together with a triac TACB connected in parallel to said series circuit. Then the gate of the TACB and the capacitor C10 are connected to each other via a trigger element 11. The switch 7 is closed and the capacitor C10 is charged via resistances 8 and 9. When the charged voltage of the C10 reaches the breakover voltage of the element 11, the TACB conducts with the element 11 to give a short circuit to the winding 4. In this case, the pulse type voltage is induced at the winding 2, and the element A conducts via a resistance 5 to apply the voltage to a load 6. The firing angle of an element B is changed with control of the resistance 8, and then the conduction phase of the element A is changed.

Description

[Detailed description of the invention] The present invention relates to an AC power phase control circuit.

Conventionally, phase control circuits for AC power sources using triacs and the like are all internally connected to the AC power source, so there is a danger of electric shock when controlling the phase.

In view of the above-mentioned drawbacks of the conventional circuit, the present invention has been completely improved and eliminated, and includes a non-contact switching element that performs ON-OFF control of the IQj load on the primary winding side of the transformer connected to the power supply side and the and a resistor for the gate voltage of the switching element are connected, and on the secondary winding side, which has a low voltage, there is a trigger element connected to the gate, which breaks over by the optical voltage of the capacitor, and a variable triac. By connecting a resistor and changing the value of the variable resistor, the time constant of Re is completely changed, and the timing at which the trigger element breaks over is changed.
Controls the firing angle of the triac on the next winding side, generates a pulsed current in the primary winding of the transformer that is electromagnetically coupled to the firing angle control section, and applies a gate voltage using this pulsed current. The non-contact switching element opens and closes the entire AC power source to control the entire AC power supply, without the risk of electrical shock. The purpose is to provide a circuit.

The structure of the present invention will be explained below based on the embodiment shown in the drawings.

11th %1 shows the first embodiment of the present invention.

In the figure, 1 is a transformer, 2 is a primary winding of the transformer, 3 is an AC power source thereof, and 4 is a secondary winding of the transformer 1. A gate voltage resistor 5 is connected in series to the primary winding 2, and a non-contact switching element A such as a triac or thyristor is connected in parallel to the series circuit. The six-key single-channel switching element Af is connected between the alternating current power source 3 and has a constant load, and as shown in the figure, this may be located at the terminals a-brlJj, as long as it can be controlled. Next, transformer 1
The secondary side of will be explained. The secondary side of the transformer l includes an on/off switch 7, a variable resistor 8 and a resistor 9, and a capacitor 10.
TRIAC B is connected in parallel to a circuit in which TRIAC B is connected in series. The gate of the triac B is connected to the play quartz of the capacitor IO (S which is triggered by the - voltage).
Connected to trigger element 11 such as BS, diac, etc.
Zero or more strike firing angle control units forming a trigger circuit are connected to both ends of the secondary winding of the transformer l.

In the circuit of the first embodiment configured as described above, when the open/close switch 7 is turned on (ON), a The induced voltage of the secondary winding 4, which has a low voltage of 10 volts, is charged over the additional time of the capacitor 10. Then, when the 9' voltage of the capacitor 10 reaches the pre-quartz voltage of the trigger element 11, the trigger element TRIAC B is triggered by TRIAC B. The trigger circuit 11 such as SBS, DIAC, etc.
Therefore, triac B is triggered in both directions as shown in Fig. 3 to control its firing angle. Therefore, the secondary winding 4 (l''ll is repeatedly short-circuited with a constant phase, and when short-circuited), a spiral 'TIL current flows.

Here, when the secondary winding 4 is short-circuited with the above-mentioned phase, the impedance of the primary winding @2 side decreases, and a pulsed current flows through the primary winding 2 side in the same phase as the triac B. , the voltage across the gate resistor 50 of switching element A increases as shown in FIG. Therefore, switching element A is fired at the same timing as triac B, as shown in (b) of the same figure. The firing angle of the triac B can be changed from 0 to 180 degrees by changing the resistance value of the variable resistor 8 in the tricar circuit and changing the time constant of the capacitor 10 by changing the time constant of the capacitor 10 using the surface non-contact transformer relay switch. Therefore, the firing angle of the switching element A can be changed in the same way. By controlling the firing angle of the switching element A, the phase-controlled AC '1 force is applied to the load 6. Note that (a) in FIG. 3 is a voltage waveform diagram of the power supply.

FIG. 2 shows an amplifying triac or iris transistor C? of switching element A on the primary side. It shows an example of 9pj2 provided, and other main? The structure of the city and its effects are exactly the same, so the explanation of 1' here will be omitted. In addition, in the figure, 12 and 13 are capacitors and resistors for absorbing current.

As explained above, the unexploded UJJ-4 has a steady contact switching element A connected in parallel to both ends of the primary winding of the transformer,
The primary side is connected in series with the primary winding and consists of a resistor for the gate voltage of switching element A, a load connected between the switching element A and the alternating current source, and a variable resistor. 51. A triac B consists of a circuit connected in series with a capacitor, and a trigger element which flakes over due to the pressure of the capacitor, connected to the gate l/ir.
The column circuit is connected to both ends of the secondary winding of the transformer.
Next side Now, what about the variable resistance on the secondary side? By changing the height of K, it can be freely changed for use in the range of 180 to 180, and has a wide range of familiarity with consumer products.
is possible. For example, by providing a variable resistor in the handle of the vacuum cleaner, the output of the vacuum cleaner can be changed arbitrarily from π approximately 0 to maximum output 4 as a remote control switch, which is convenient. Father, there is no risk of electric shock compared to the conventional one.

[Brief explanation of the drawing]

ξB 1 is a circuit diagram showing all the missing embodiments of C1 of the present invention,
Figure 2 is a circuit diagram showing the second embodiment, Figure 3 is the circuit diagram of the 11th embodiment.
In the circuit of 1, the turtle pressure wave of Miyako is 1. 2...Primary winding 5...Gate' voltage resistor 6.
...Load 8...Variable resistance IO...Capacitor
11... Trigger element special J to applicant Yayugameki Co., Ltd. Agent Patent attorney Toshihiko Uchida Figure 1 Figure 2 Figure 3 (b) Switch -

Claims (1)

[Claims] 1.) A steady contact switching element A connected in parallel to both ends of the primary winding of the lance, a resistor for gate voltage of the switching element A connected in series to the primary winding, and the switching element A connected in parallel to both ends of the primary winding of the lance; Element A (!: The primary side consists of a load connected between the main current power source, a circuit in which a variable resistor and a capacitor are connected in series, and a trigger element that breaks over due to the charging pressure of the capacitor at the gate. A phase control circuit for alternating current power using a non-contact transformer relay switch, characterized in that a parallel circuit with a connected tiger 4 inverter is combined with a secondary side connected to both ends of a secondary winding of a transformer. .