KR20080077754A - Dimmer for dimming control using phase control of ac power - Google Patents

Abstract

A dimmer for dimming control using phase control of AC power is provided to smooth dimming of a fluorescent lamp by controlling a phase of AC power supplied to a ballast to use the phase-controlled AC power as main power and a brightness control signal. A power switching element(Q1) controls a phase of input AC power(ACIN) through conducting switching control to output phase-controlled lamp driving power. A zero potential level detecting unit(10) detects a zero potential level of a voltage waveform of the AC power. A phase control signal generating unit(20) generates a square wave timing signal to control brightness in a zero potential detection position of the zero potential level detecting unit. A brightness control unit controls the brightness by controlling a timing of the square wave timing signal of the phase control signal generating unit. A dimming control unit(30) controls a conduction timing of the power switching element by being driven according to the square wave timing signal of the phase control signal generating unit.

Description

Dimmer circuit for dimming control using phase control of power supply {Dimmer for dimming control using phase control of AC power}

1 is a circuit diagram of a conventional dimmer.

2 is a configuration diagram of a dimmer circuit according to the present invention.

3 is a configuration diagram of a dimmer circuit according to another embodiment of the present invention.

Figure 4 (a) to (h) is a waveform diagram of each part of Figures 2 and 3 according to the present invention.

5 is a ballast circuit diagram for a fluorescent lamp connected to the output of the dimmer circuit according to the present invention.

<Description of the symbols for the main parts of the drawings>

 10: zero potential level detecting unit 11 radio wave rectifying unit

12: 5V voltage regulator 13: Voltage divider

14: comparator 20: phase control signal generator

21: monostable multi-vibrator 22: microcomputer

23: up / down and on / off button 24: infrared receiver

25: remote control 30: dimming control unit

31: photo triac 32, 32: first and second snubber

41, 41 ', 41 ": filter part 42: full-wave rectifying part

43: peak detector 44: low pass filter

45: voltage controlled oscillator 46: driver

47: noise filter 48: lamp

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimmer switch, and more particularly, to a dimming control dimmer circuit using a phase control of an AC power source to directly control an AC input voltage line to perform dimming control.

All conventional dimmers are passive for controlling resistive loads, and the dimming waveform is well controlled at an appropriate amount of resistive load, but the dimming waveform is not controlled as desired at "C" capacitive loads such as fluorescent lamps. Very irregular dimming waveforms are obtained. In addition, in the conventional passive dimmer, when the input A / C voltage changes, or the amount of load changes, the triac control conditions in the dimmer change, resulting in more irregular dimming waveforms. Dimming fluorescent lamps is even more impossible.

1 shows an example of a circuit diagram of a conventional dimmer. As shown in FIG. 1,

After the input power (AC) line through the reactor (L1), it is configured to control the triac (Q1) via the timer circuit (1), and configured to supply power to the lamp (LAMP) through the triac (Q1) do. A lamp on / off switch SW1 is installed between the triac Q1 and the lamp LAMP, and a resistor R5 and a light emitting diode LED for displaying the state of the switch SW1 are connected in parallel. do. In addition, the timer circuit 1 includes a resistor R1 (R2) connected in series between the both ends of the triac Q1 through a capacitor C2 and having a single stage timer, and the triac Q1. A resistor R4 connected in series through the capacitor C3 and a user-adjustable variable resistor VR6 are connected between both ends of the second stage of the timer, and the resistor R3 at the capacitor C2. It is connected to the connection point of the resistor (R4) and the condenser (C3) through and is connected to the control terminal of the triac (Q1) through the diaak (D1) at the connection point.

In the conventional dimmer circuit configured as described above, if the value of the variable resistor VR6 of the timer circuit 1 is small, the amount of phase control of the triac Q1 is small and almost all waveforms are transmitted, and the value of the variable resistor VR6 is increased. The higher the phase control amount of the triac Q1, the smaller the amount delivered.

However, while the load is small, the amount transferred through the triac (Q1) is small, while the value of (C1) is basically changed through the capacitor (C2), resistors (R1, R2) and capacitors (C3), and resistors (R4, VR6). If the load is small, the dimming waveform does not come out properly when power is supplied to the load.

In addition, in the case of a "C" capacitive load, the phase-controlled waveform for dimming is integrated due to C, so that the dimming waveform is not properly transmitted.

On the other hand, the conventional fluorescent lamp dimming control device is provided with a separate dimming controller, and the power line and the dimming control line is connected to the ballast side separately to control the dimming, the AC power line itself is not a dimming control disadvantage There was this.

Accordingly, the present invention provides a dimming control dimmer circuit using phase control of an active AC power source designed to make a dimming waveform suitable for brightness control of a compact fluorescent lamp (CFL) having a ballast. It is to.

In general, in order to control the brightness of the fluorescent lamp, the brightness is controlled by controlling the current flowing in the fluorescent lamp, which uses a frequency variable method. In this case, a control signal for controlling the brightness must be supplied through a separate signal line. .

In the present invention, unlike the conventional method of separately transmitting the dimming signal, by controlling the phase of the AC power supplied to the ballast, it is possible to smooth the dimming of the fluorescent lamp under the conditions of using it as a control signal for controlling the main power and brightness. To provide a dimmer.

The present invention includes a power supply switching element for controlling the phase of an input AC power source (ACIN) by energizing switching and outputting the lamp driving power source; A zero potential level detector configured to receive the AC power and detect a zero potential level of a voltage waveform; A phase control signal generator for generating a square wave signal for brightness control in synchronization with the zero potential detection time of the zero potential level detector; Brightness control means for controlling brightness by adjusting a section size of the square wave signal of the phase control signal generator; And a dimming control unit which is driven by the square wave signal of the phase control signal generating unit to control the energization timing of the power switching element.

The zero potential level detection unit includes a full-wave rectifying unit for full-wave rectifying the input power; A regulator for stabilizing the full-wave rectified voltage waveform to a predetermined DC voltage and supplying the same to the device driving voltage; A voltage divider for adjusting a voltage level to process the output signal of the full wave rectifier in a low voltage circuit; Comparing the output voltage of the voltage divider with a predetermined reference voltage (VDC) and a reference voltage is a comparator for detecting the position of the zero potential by outputting a high pulse at a level higher than the voltage of the voltage divider.

The phase control signal generator is configured as a monostable multivibrator for generating a square wave timing signal controlled by the control of the brightness control means at the zero potential detection position of the zero potential level detector. The variable resistor can be configured by the user.

The phase control signal generator may include a microcomputer for generating a square wave timing signal controlled by the control of the brightness adjusting means at the zero potential detecting position of the zero potential level detecting unit. It can be configured as possible up / down and on / off buttons or variable resistors, and in the case of employing a microcomputer, an infrared receiver capable of remote control may be further included to include remote control using a remote controller.

The dimming control unit is a phototriac for controlling the energization of the power switching element, which is controlled by the transistor Q6 controlled by the output signal of the phase control signal generator and the resistor R6 by the transistor Q6. A first snubber and a photo connected to the phototriac SSR and a control terminal of the power switching device by receiving input power from an input terminal of the power switching device and filtering the input power to a predetermined level. And a second snubber connected between a triac and an output terminal of the power switching element to form a bypass path of the photo triac.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of a dimmer circuit according to the present invention, and FIG. 3 is a configuration diagram of a dimmer circuit according to another embodiment of the present invention. 4 is a circuit diagram of a ballast for a fluorescent lamp connected to the output of the dimmer circuit according to the present invention, and FIG. 5 shows waveforms of each part of FIGS. 2 and 3.

In the dimmer circuit according to the present invention, the dimmer circuit is configured to output the input AC power source ACIN to the power source of a fluorescent ballast or incandescent lamp via the power source switching element Q1. As illustrated in the drawing, the power switching device uses a triac Q1 having a control terminal. Instead of a triac, a phase-controlled power switching element can be used.

The dimmer circuit for dimming control of the present invention includes: a zero potential level detector (10) for receiving the AC power (ACIN) and detecting a zero potential level of a voltage waveform; A phase control signal generator 20 for generating a square wave timing signal for brightness control at the zero potential detection position of the zero potential level detector 10; Brightness control means for controlling brightness by adjusting the timing of the square wave timing signal of the phase control signal generator 20; And a dimming controller 30 which is driven by the square wave timing output signal of the phase control signal generator 20 to control the energization timing of the power switching element.

The zero potential level detecting unit 10 includes: a full-wave rectifying unit 11 for full-wave rectifying the input power; A 5V voltage regulator 12 which stabilizes the full-wave rectified voltage waveform to a predetermined DC voltage and supplies the same as the device driving voltage; A voltage divider (13) for adjusting a voltage level to process the output signal of the full wave rectifier (11) in a low voltage circuit; A comparator for comparing the output voltage of the voltage divider 13 with a preset reference voltage VDC and outputting a high pulse in a section where the reference voltage is higher than the voltage of the voltage divider 13 to detect a zero potential position ( 14).

As shown in FIG. 2, the phase control signal generator 20 generates a square wave timing signal that is controlled by the control of the brightness adjusting means at the zero potential detection position of the zero potential level detector 10. It is configured as a stable multi-vibrator 21, the brightness adjustment means may be configured by a variable resistance (VR) that can be operated by the user.

In addition, as shown in FIG. 3, the phase control signal generator 20 generates a square wave timing signal controlled by the control of the brightness adjusting means at the zero potential detection position of the zero potential level detector 10. It is configured as a microcomputer 22, the brightness control means can be configured by the user can operate the up / down and on / off button 23, or a variable resistor, when the microcomputer 22 is employed, It may also be configured to enable remote control using the remote control 25 by further comprising a controllable infrared receiver 24.

The dimming control unit 30 is controlled by the transistor Q6 controlled by the output signal of the phase control signal generation unit 20 and the resistor R6 by the transistor Q6 to control the power switching element ( A photo triac (SSR) 31 for controlling the energization of Q1) and an input power input from an input terminal of the power switching element Q1 is filtered to a predetermined level to filter the phototriac (SSR) 31 and the The first snubber 32 connected to the control terminal of the power switching element and between the phototriac 31 and the output terminal of the power switching element Q1 are connected to each other. And a second snubber 33 forming a pass path.

When the sinusoidal AC input signal ACIN as shown in FIG. 4 (a) enters and is rectified through the bridge diode 11 and passed through the voltage divider 13, the wave is level-converted as shown in FIG. 4 (b). The rectified waveform (A signal) is applied to the input of the comparator 14.

The other terminal of the comparator 14 has a reference voltage VDC such as the VDC waveform in FIG. 4 (b). The comparator output is high when the reference voltage and the level-converted full-wave rectified waveform are compared to each other. High), which appears as a comparator output signal (B signal) as shown in FIG.

The role of the comparator 14 is to detect the position of the zero potential level of the AC input, and the dimming signal of the dimmer controls the phase using the zero potential point as a reference position to produce a dimming signal.

When the output of the comparator 14 indicating the position of this zero potential level is applied to the input of the monostable multivibrator 21 of Fig. 2, the AC power supply whose phase is controlled in accordance with the value of the variable resistor VR which determines the dimming range is It is outputted as dimming signal ACOUT.

The timing signal controlled by the variable resistor VR connected to the monostable multivibrator 21 is output as shown in FIG. 4 (d) to drive the transistor Q2 of the dimming control unit 30, By turning on the photodiode of the phototriac 31 in the section where Q2) is turned on, the phototriac 31 is turned on to energize the triac Q1, which is a power switching element, to output a dimming signal ACOUT. Here, the photo triac 31 is a solid state relay (SSR) and is called a photo triac for convenience.

When the signal C signal controlled as shown in FIG. 4 (d) is applied to the base of the transistor Q2 of the dimming control unit 30, the phototriac ( 31) (SSR) is turned off to turn off the main triac Q1 to cut off the AC power supply. When the base potential of the transistor Q2 is high, the photo triac 31 (SSR) is turned on. The main triac Q1 is turned on to supply AC power.

When the off period of the timing signal applied to the base of the transistor Q2 is short, the off period of the phototriac 31 is also shortened, so that the AC power supply time is longer, and the corresponding dimming signal is also increased. The longer the period, the longer the off period of the phototriac 31, the shorter the AC power supply time is, and the corresponding dimming signal is smaller. These waveforms are shown in FIGS. 4E to 4G.

That is, if the high period of the timing signal is adjusted as d1, d2, d3 in the waveform (d) of FIG. 4 by the control of the variable resistance VR, the main triac Q1 is controlled in response thereto. The dimming signals ACOUT1, ACOUT2, and ACOUT3 are output in the waveforms as shown in (e) to (g).

In FIG. 2, the 5V voltage regulator 12 is a DC power supply for supplying power to the driving circuits of the comparator 14, the monostable multivibrator circuit 21, and the dimming controller 30, and the voltage divider 13 is It is a device that lowers the potential level of a signal so that a full-wave rectified signal can be processed in a low voltage circuit.

In addition, the variable resistor VR connected to the monostable multivibrator circuit is a delay element that determines the timing of the control phase on the basis of the zero potential in controlling the phase of the AC power supply. The transistor Q2 of the dimming controller 30 is A driving transistor for driving the photo triac 31 (SSR) and a resistor R6 is a resistor for determining the primary side driving current of the SSR when driving the photo triac 31.

In FIG. 2, first and second snubber circuits 32 and 33 are provided between the gate of the triac Q1 and another terminal of the triac Q1. It is a circuit for preventing chattering that occurs during on / off.

In this way, the AC power controlled in phase is applied to the ballast for the fluorescent lamp shown in FIG. In addition, even when there is a load amount or an input voltage variation, a constant dimming waveform can be obtained at all times.

5A to 5C are exemplary diagrams of a ballast circuit diagram of a fluorescent lamp connected to an output terminal of a dimmer according to the present invention.

A filter unit 41 for receiving a dimming signal Acout from the dimmer circuit and filtering noise through an inductor L1 and a capacitor C1 as well as filtering a high frequency signal through an EMI filter as shown in FIG. 5A; A full-wave rectifying unit 42 for full-wave rectifying the signal of the filter unit 41; A peak detector 43 for converting the signal of the full wave rectifier 42 into a DC voltage through a diode and a peak detection capacitor and applying the signal to the driver 46; A low pass filter 44 for low pass filtering (LPF) the output signal of the full wave rectifier 42 to filter the DC signal at a level according to dimming control; A voltage controlled oscillator (VCO) 45 which performs voltage controlled oscillation by the output voltage level of the low pass filter 44; A driver (46) for switching the DC voltage of the peak detector (43) under the control of the voltage controlled oscillator (45) to output a lamp driving signal; And a noise filter 47 for noise filtering the lamp driving signal of the driver 46 and applying it to the lamp 48.

The ballast circuit configured as described above receives waveform signals such as (e) to (g) of FIG. 4 as the lamp driving power sources Actout1 to 3 controlled in the light control circuit as shown in FIG. 2 or 3. The phase controlled AC power is input to the filter unit 41 of the ballast circuit, and the filter unit 41 filters and propagates noise and high frequency components through an inductor L1, a capacitor C1, and an EMI filter EMI. Input to the rectifier 42, full-wave rectified by the bridge diode of the full-wave rectifier 43.

When the AC power controlled in phase as shown in FIGS. 4E, 4F, and 4G is input, full-wave rectification is performed by the full-wave rectifying unit 42, and (c), (d), and (e) of FIG. It is full-wave rectified with the same waveform, and becomes a DC voltage at the same level as V1, V2, and V3, respectively, as shown in FIG. That is, as shown in (d) of FIG. 4, when the dimming control is performed by d1, d2, and d3 in the dimming circuit, respectively, as shown in FIG. Based on this level, the voltage controlled oscillation of the voltage controlled oscillator 45 is controlled.

Therefore, the driver 46 controls the DC voltage of the peak detector 43 under the control of the voltage controlled oscillator 45 to drive the lamp 48 through the noise filter 47, thereby enabling brightness adjustment.

The configuration of the filter unit 41 in the ballast circuit of FIG. 5A is configured to perform noise and high frequency filtering through the EMI filter EMI after the input dimming signal is passed through the inductor L1 and through the capacitor C1. .

In addition, in the ballast circuit of FIG. 5B, the configuration of the filter part 41 ′ is configured to perform noise and high frequency filtering through the inductor L1, first through the EMI filter EMI, and then through the capacitor C1. Is configured to.

In the ballast circuit of FIG. 5C, the filter unit 41 ″ is configured to filter the input dimming signal first through the EMI filter EMI without the inductor L1, and then perform noise and high frequency filtering through the capacitor C1. do.

The inductor L1 serves to prevent the phase controlled AC power from appearing as a capacitive load when applied to the fluorescent lamp ballast of FIG. 5. If there is no inductor (L1), when the load is small by the capacitor (C1), an X-cap for EMI filter, the phase of the AC power controlled phase is collapsed, the desired dimming function can not be obtained. That is, when the phase-controlled dimming signal is directly applied to the capacitor C1, the dimming function cannot be performed. Thus, the capacitor C1 and the EMI filter EMI are disposed with the inductor L1 at the front end as shown in FIG. 5A, As shown in FIG. 5B, the EMI filter EMI and the capacitor C1 are arranged in order with the inductor L1 at the front end, or when the inductor L1 is not provided as shown in FIG. 5C, the EMI filter EMI is placed at the front end. The capacitor C1, which is an X-cap for the EMI filter, is disposed behind the capacitor C1 to prevent the AC power phase from collapsing.

The waveform after the phase controlled AC power is applied to FIG. 5 and passes through the full-wave rectifying circuit BD1 is shown as D_1 to D_3 waveforms in FIGS.

When the full-wave rectified waveforms (D_1 to D_3 waveforms) are voltage-divided and integrated through the low pass filter (LPF1) 41, DC voltages V1, V2, and V3 are generated as shown in FIG. By controlling the voltage controlled oscillator (VCO) 45 with this DC voltage to change the frequency, it is possible to adjust the tube current of the fluorescent lamp 48 to adjust the brightness.

The circuit composed of the diode D2 and the condenser C2 of the peak detector 43 serves to peak detect a phase-controlled full-wave rectified waveform and to supply a constant DC voltage to the lamp driving circuit 43 of the fluorescent lamp ballast. .

Meanwhile, FIG. 3 illustrates a method of generating an active dimming waveform using the microcomputer 22 as another embodiment of the present invention.

In FIG. 3, the phase can be controlled by adjusting the delay time using the up / down and on / off buttons 23 using the microcomputer 22, and the remote controller 25 is connected to the infrared receiver 24. This allows dimming waveforms to be created by remotely controlling the amount of power on / off and phase.

As described in detail above, fluorescent lamp dimming, which is not possible with a passive dimmer of a conventional type, has been made possible by utilizing an active method of the present invention. Therefore, the present invention has an effect that can be very usefully used as a dimmer circuit of a low-cost, low-power simple fluorescent lamp such as CFL.

Claims (7)

A power switching element Q1 for controlling the phase of the input AC power ACIN by energization switching control and outputting it to the phase controlled lamp driving power supply; A zero potential level detector (10) for receiving the AC power (ACIN) and detecting a zero potential level of a voltage waveform; A phase control signal generator 20 for generating a square wave timing signal for brightness control at the zero potential detection position of the zero potential level detector 10; Brightness control means for controlling brightness by adjusting the timing of the square wave timing signal of the phase control signal generator 20; Dimming control using a phase control of the AC power source, characterized in that it comprises a dimming control unit 30 is driven by the square wave timing output signal of the phase control signal generator 20 to control the energization timing of the power switching element. Dimmer circuit. The method of claim 1, wherein the zero potential level detector 10, A full-wave rectifier 11 for full-wave rectifying the input power; A 5V voltage regulator 12 which stabilizes the full-wave rectified voltage waveform to a predetermined DC voltage and supplies the same as the device driving voltage; A voltage divider (13) for adjusting a voltage level to process the output signal of the full wave rectifier (11) in a low voltage circuit; A comparator for comparing the output voltage of the voltage divider 13 with a preset reference voltage VDC and outputting a high pulse in a section where the reference voltage is higher than the voltage of the voltage divider 13 to detect a zero potential position ( A dimming circuit for dimming control using phase control of an AC power source, characterized in that consisting of 14). The method of claim 1, wherein the phase control signal generator 20, And configured as a monostable multivibrator 21 for generating a square wave timing signal which is adjusted by the control of the brightness adjusting means at the zero potential detecting position of the zero potential level detecting unit 10. A dimming circuit for dimming control using phase control of an AC power source, characterized in that it comprises a variable resistor (VR). The method of claim 1, wherein the phase control signal generator 20, And a microcomputer 22 for generating a square wave timing signal controlled by the control of the brightness adjusting means at the zero potential detecting position of the zero potential level detecting unit 10, and the brightness adjusting means is provided to the microcomputer 22. A dimming circuit for dimming control using phase control of an AC power source, characterized in that the square wave timing signal comprises an up / down and on / off button (23) for inputting a control signal. [5] The apparatus of claim 4, further comprising an infrared receiver 24 for receiving a remote control signal for dimming up / down and on / off and inputting it to the microcomputer 22 and a remote controller 25 for remote control. A dimming control dimmer circuit using phase control of an AC power supply. According to claim 1, The dimming control unit 30, A transistor Q6 controlled by the output signal of the phase control signal generator 20; A phototriac (SSR) 31 controlled by the transistor Q6 through the resistor R6 to control the energization of the power switching element Q1; A first snubber connected to the phototriac (SSR) 31 and the control terminal of the power switching device by receiving input power from the input terminal of the power switching device Q1 and filtering to a predetermined level to prevent chattering. (Snubber) 32 and the phototriac 31 and the output terminal of the power supply switching element (Q1) is connected to form a bypass path of the phototriac 31 and to prevent chattering A dimming circuit for dimming control using phase control of an AC power source, characterized in that it comprises two snubbers (33). The dimming circuit for dimming control according to claim 1, wherein the dimmer circuit is configured to output a phase controlled signal to a fluorescent ballast circuit through an inductor (L1) which prevents a capacitive load. .

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