KR100225793B1 - Phase controlling circuit - Google Patents

Abstract

It is an object of the present invention to provide a phase control circuit which is realized by a very simple circuit in which a photocoupler and a resistor are connected to the four output ports of the counter and which is low in production cost, The phase width can be selected and adjusted so that the phase width of the load can be precisely finely adjusted.

In order to achieve the above-mentioned object, the present invention provides an AC power source connected to a load and controlling a power supply of the load to control the phase; An input selector 10 for selecting up and down and selectively controlling input; A counter (20) for counting the selection signal as a clock by the input selector (10); A switching unit (30) switched by an output signal of the counter (20); A tree rejection unit 40 which is charged and discharged by an output signal of the switching unit 30 and outputs a trigger signal; And a triac that controls the phase angle of the AC power source supplied to the load by the output signal of the tree rejection unit 40.

Description

Phase control circuit

FIG. 1 is a phase control circuit diagram according to an embodiment of the present invention; FIG.

Figures 2a to 2b are output waveform diagrams according to the phase control circuit of Figure 1;

DESCRIPTION OF THE REFERENCE NUMERALS

10: Input selection part 20: Counter

30: switching part 40: tree reject

60: display unit TR ₁ ~ TR _4: transistor

P ₁ to P ₄ : Photocouplers R ₁ to R ₁₅ : Resistance

DA: Diacid TA: Triac

C ₁ ~ C ₃ : Capacitor OR: Orcate

DV: Display driver DP: Display

The present invention relates to a phase control circuit, and more particularly, to a phase control circuit capable of finely adjusting the phase width of an AC power source supplied to a load to sixteen levels arbitrarily while confirming on the display.

In general, since the phase control circuit controls the power supplied to the load by changing the phase of the power supplied to the load, there is no power loss. Accordingly, the motor control circuit for controlling the motor, the heater control circuit , A lamp control circuit for controlling the brightness of a lamp, a lamp control circuit for controlling a lamp to be turned on and off, and the like.

In order to control the load as described above, conventionally, a triac connected in series with the alternating-current load to the alternating-current power supply for opening and closing a current path of positive and negative electric potentials to be supplied to the alternating-current load, And a start control circuit for supplying a start pulse to the gate of the triac to adjust the starting point of the positive and negative potentials of the AC power to be supplied to the AC load. The start control circuit included in the conventional phase control circuit includes a variable integrator configured by a capacitor and a variable resistor variable by a user to integrate the positive and negative potentials of the AC power source, And a trigger circuit which generates a start pulse when a predetermined voltage is reached and supplies the generated start pulse to the gate of the triac to start the triac.

As described above, the conventional phase control device adjusts the voltage charging time of the capacitor by the variable resistance value varying as the user operates it, adjusts the generation time of the starting pulse, and controls the positive and negative electric potentials And the starting point of energization was controlled.

However, since the conventional phase control device controls the starting point of the positive and negative potentials of the AC power source in accordance with the resistance value of the variable resistor variable by the user's operation, the user can precisely control the phase of the AC power There is a problem that the variable resistor must be operated several times when the user adjusts the phase width of the AC power source to a desired value.

The conventional phase control device having a variable resistance has a problem that breakdown due to abrasion and damage of the variable resistor frequently occurs.

In addition, the conventional phase control device has a problem that an integrated circuit constituting the trigger circuit can not be used as a trigger diode having a high voltage of about 30 to 45 V as a conduction voltage.

In order to solve the above-mentioned problems, a phase control device (hereinafter referred to as "prior art" hereinafter) disclosed in Japanese Patent Application No. 93-4810 (No. 96-1955) by the present applicant has an analog switch The phase width can be arbitrarily adjusted by connecting the switches SW ₁ to SW ₁₀ and controlling the phase width by the resistors R ₁ and R ₃ and the capacitors C ₁ to C ₁₀ by switching the analog switch .

However, since the prior art phase control device requires analog switches and capacitors of a desired width in order to set the control width for controlling the phase width, the circuit is very complicated and the production cost is accordingly high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a phase control circuit which is realized by a very simple circuit in which a photocoupler and a resistor are connected to four output ports of a counter, will be.

Yet another object of the present invention is to precisely fine-tune the phase width of the load by making it possible to select and adjust the phase width while confirming the step of arbitrarily selecting the phase width on the display.

According to an aspect of the present invention, there is provided a phase control circuit for controlling an AC power source by connecting a load to a load and controlling a phase of the load by controlling a power supply of the load; Up selector switch and a down selector switch, and the switches are respectively inputted to an OR circuit through a smit trigger circuit and outputted as a clock signal to select an up and down operation and to select an input for selectively controlling a clock input signal part; A counter for counting and outputting a signal selected by the input selector as a clock; A switching unit including a transistor switched by the output of the counter and an optocoupler connected to the transistor and switched by an output signal of the counter; A triple rejection circuit comprising a capacitor which is charged and discharged by the output signal of the photocoupler and a diode which is triggered by the discharging signal of the capacitor and which outputs a trigger signal and an ac power supply And a triac controlling the phase angle of the triac.

The present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a phase control circuit diagram according to an embodiment of the present invention; FIG. 2 is an AC input waveform diagram and FIG. 1b is a phase controlled output waveform diagram on the road according to the phase control circuit of FIG.

The power supply B ⁺ is connected to the up / down terminal (up / down) of the counter 20 via the up-selection switch SW ₁ of the input selection unit 10, switch (SW ₁₎ is to be a resistance (R _13, R ₁₄₎ and the clock signal through the Schmitt trigger capacitor as the time constant charge and discharge by connecting the (C ₂₎ (SN ₁₎ output. And-down selection switch (SW ₂₎ has a resistance (R _15, R ₁₆₎ and capacitor (C ₃₎ a through power (B ⁺⁾ that can be charged, the clock signal output from the Schmitt trigger as the time constant discharge (SN ₂₎ .

The outputs of the Schmitt triggers SN ₁ and SN ₂ are input to the clock terminal CL of the counter 20 through the OR gate OR.

Therefore, the counter 20 generates the corresponding output at the output terminals A, B, C and D according to the input selection of the up / down terminal and the clock terminal of the clock terminal CL, Table 1 below shows.

The transistors TR ₁ to TR ₄ are connected to bias outputs R ₉ to R ₁₂ connected to the counter outputs A, B, C and D as shown in Table 1, ) is conductive and the transistor (TR ₁ ~ TR ₄ resistance (R ₅ ~ R ₈₎ connected to the collector of a) and the photocoupler (P ₁ ~ P ₄₎ into the conduction there is, the photo-coupler (P ₁ ~ P ₄₎ The resistors R ₁ to R ₄ are combined by conduction as shown in Table 1 to control the power of the tree rejection 40 to control the phase.

That is, the four resistors P ₁ , P ₂ , P ₃ and P ₄ are selected individually or in parallel by the output signal of the counter 20, The power source is controlled to arbitrarily control the phase width of the triac TA.

Triac through the transistor (TR ₁₎ is conductive resistance (R _1), only the capacitor of the tree refused 40 via (C _1), die solution (DA) for the time (t ₂₎ to the filling, and then discharged at ( TA are conducted and the phase width of the load LOAD is determined.

However, step 4, is the output high signal at the output terminal (A) of the counter 20, the output terminal (A, B) is at a high signal is output from, for example if the step 2 counter (20) of the transistor (TR ₁ ~ TR _{And the} photocouplers P ₁ to P ₂ are turned on so that the resistor R ₁ and the resistor R ₂ are connected in parallel and the resistor R = (R ₁ + R ₂ ) / R ₁ × R ₂ ] is charged in the capacitor C ₁ of the transistor 40 and then discharged while the triacid TA is conducted through the die liquid DA, so that the phase width is changed.

The time T of the phase width is determined by the resistances of the photocouplers P ₁ to P ₄ connected to the output terminals A, B, C and D of the counter 20, ₁ ), and the values of the resistors (R ₁ to R ₄ ) are set to have the longest time in the step (t ₁₆ ).

In this way there is enabled, any fine selection by the up / down selector switch (SW _1, SW ₂₎ of the input selection section 10, each of the selected phase is the display driver (DV of the display unit 60 from the counter 20 ) To display the number 1 to 16 on the display (DP) and display the status of the up (↑) or down (↓) currently being selected so that the user can select the desired phase width As shown in FIG.

As described above, the phase control circuit of the present invention controls the phase with four resistors by using the counter. Therefore, it is possible to adjust up to 16 steps for a very simple configuration. When the user confirms the current selection step on the display, The phase width can be arbitrarily selected and adjusted arbitrarily, so that it can be usefully used in an electric circuit requiring phase control.

Claims (2)

Connecting the AC power source to the load and controlling the phase of the load by controlling the power source of the load; Up selection switch (SW ₁₎ and a down selection switch (SW ₂₎ to provided the input to each scan mitt trigger circuit (SN _1, SN ₂₎ the OR circuit (OR) via in said switch (SW _1, SW ₂₎ a clock An input selector (10) configured to output an output signal and select an up and down operation and selectively control a clock input signal; A counter (20) for counting and outputting a signal selected by the input selector (10) as a clock; TR ₁ , TR ₂ , TR ₃ and TR ₄ switched by the output of the counter 20 and photocouplers P ₁ and TR ₂ connected to the transistors TR ₁ , TR ₂ , TR ₃ and TR ₄ , P ₂ , P ₃ , and P ₄ ) and is switched by an output signal of the counter (20); A capacitor C ₁ charged and discharged to the output signal of the photocoupler P ₁ , P ₂ , P ₃ and P ₄ and a die liquid DA triggered by the discharge signal of the capacitor C ₁ And a triac (TA) for controlling the phase angle of the AC power supplied to the load by an output signal of the tree rejection circuit (40) . The apparatus according to claim 1, further comprising a display unit (60) formed of a display (DP) displayed through a driving unit (DA) according to an output signal of the counter (20) Circuit.