KR20120036182A - Electronic dimming ballast - Google Patents

Abstract

PURPOSE: An electronic dimming ballast is provided to easily implement various colors and brightness by differently controlling illumination and color temperature of each lamp. CONSTITUTION: An AC filter/rectifier(102) rectifies AC power. A PFC circuit unit(104) improves a power factor of a rectification voltage outputted from the AC filter/rectifier. A PWM signal generator(106) generates two or more different PWM signals by receiving a PWM control signal from the outside. A dimming control unit(114) generates a dimming signal by rectifying the received PWM signal. An inverter circuit unit(110) outputs a high frequency pulse voltage by a high frequency switching according to a dimming signal.

Description

Electronic dimming ballast {ELECTRONIC DIMMING BALLAST}

An embodiment of the present invention relates to an electronic dimming ballast, and more particularly, to an electronic dimming ballast capable of individually dimming a plurality of lamps for each lamp.

In general, a ballast used in a luminaire refers to a device that controls the driving of the lamp by a variety of input signals and signals that sense the illuminance around the lamp. These ballasts are classified into magnetic ballasts and electronic ballasts. The magnetic ballasts are bulky, heavy, and inefficient since impedance is determined by the amount of coils to be wound. Therefore, electronic ballasts having excellent efficiency and power saving effect are used more than magnetic ballasts.

However, in the case of driving a plurality of lamps, the conventional electronic ballast controls the plurality of lamps with one dimming control signal, so that only a plurality of lamps can be controlled in the same brightness state, and each lamp is individually dimmed. Therefore, there is a problem in that the illumination and color temperature can not be adjusted differently for each lamp.

An embodiment of the present invention is to provide an electronic dimming ballast capable of individually dimming control of a plurality of lamps for each lamp.

Electronic dimming ballast according to an embodiment of the present invention, the AC filter / rectifier for removing the noise of the AC commercial power, and rectifying the AC commercial power; A PFC circuit unit for improving the power factor of the rectified voltage output from the AC filter / rectifier and converting the rectified voltage to a DC voltage; A PWM signal generator which receives a PWM control signal and generates two or more different PWM signals; Two or more dimming controllers respectively receiving the PWM signals and rectifying the received PWM signals to generate dimming signals, respectively; Two or more inverter circuits each receiving the dimming signal and outputting a high frequency pulse voltage by performing high frequency switching according to the dimming signal; Two or more resonant circuit units for converting the high frequency pulse voltages into sinusoidal voltages and supplying the lamps to the respective lamps to drive the corresponding lamps; Two or more power supply circuit units respectively connected to the two or more resonant circuit units and supplying power to the PFC circuit unit and the two or more resonant circuit units, respectively; And two or more feedback circuits connected to each of the lamps to detect an output current of each lamp, and to feed back the detected currents to the two or more inverter circuits, respectively.

According to an embodiment of the present invention, a plurality of lamps can be individually dimmed through one electronic ballast. In this case, since the illumination and color temperature can be adjusted differently for each lamp using one electronic ballast, various colors and brightness can be realized.

In addition, since the AC filter / rectifier, the PFC circuit, and the PWM signal generator are commonly used, manufacturing cost can be reduced by reducing the number of components.

1 is a view showing the configuration of an electronic dimming ballast according to an embodiment of the present invention.
2 is a circuit diagram of an AC filter / rectifier according to an embodiment of the present invention.
3 is a circuit diagram illustrating a PFC circuit unit, a startup circuit unit, and a power supply circuit unit according to an embodiment of the present invention.
4 is a circuit diagram illustrating a power supply circuit unit, a resonance circuit unit, a dimming signal receiver, and a feedback circuit unit according to an exemplary embodiment of the present invention.
5 is a circuit diagram illustrating a dimming control unit, a feedback circuit unit, and an inverter circuit unit according to an embodiment of the present invention.

Hereinafter, specific embodiments of the electronic dimming ballast of the present invention will be described with reference to FIGS. 1 to 5. However, this is only an exemplary embodiment and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical spirit of the present invention is determined by the claims, and the following embodiments are merely means for effectively explaining the technical spirit of the present invention to those skilled in the art to which the present invention pertains.

1 is a view showing the configuration of an electronic dimming ballast according to an embodiment of the present invention. Here, a state of dimming the two lamps separately is shown for convenience of description, but the present invention is not limited thereto, and two or more lamps may be individually controlled by the same principle.

Referring to FIG. 1, the electronic dimming ballast 100 includes an AC filter / rectifier 102, a power factor correction (PFC) circuit unit 104, a pulse width modulation (PWM) signal generator 106, and a first start circuit unit ( 108, the first inverter circuit unit 110, the first dimming signal receiving unit 112, the first dimming control unit 114, the first resonant circuit unit 116, the first power supply circuit unit 118, and the first feedback circuit unit ( 120, the first lamp 130, the second starting circuit unit 158, the second inverter circuit unit 160, the second dimming signal receiving unit 162, the second dimming control unit 164, and the second resonant circuit unit 166. , A second power supply circuit unit 168, a second feedback circuit unit 170, and a second lamp 180.

The AC filter / rectifier 102 receives AC commercial power, removes noise included in the AC commercial power, and rectifies the AC commercial power. In the AC filter / rectifier, '/' has the meaning of 'and'. That is, the AC filter / rectifier means the AC filter and the rectifier.

The PFC circuit unit 104 improves the rectified voltage output from the AC filter / rectifier 102 and converts the DC voltage into a constant DC output.

That is, the PFC circuit unit 104 converts the rectified voltage of the AC filter / rectifier 102 into a DC voltage having a constant output. In this case, the phase difference between the current and the voltage generated in the process of converting the rectified voltage into a DC voltage is determined. Match to improve power factor. In this case, harmonics caused by the phase difference between the current and the voltage can be suppressed.

The output voltage of the PFC circuit unit 104 is used as a power supply voltage of the first resonant circuit unit 116 and the second resonant circuit unit 166.

The pulse width modulation (PWM) signal generator 106 receives a PWM control signal from the outside by wireless (for example, infrared communication) to receive a first PWM signal PWM 1 and a second PWM signal PWM 2. Generate. In this case, the first PWM signal is output to the first dimming signal receiver 112, and the second PWM signal is output to the second dimming signal receiver 162.

The first starter circuit unit 108 inputs the output voltage of the AC filter / rectifier unit 102 to the first inverter circuit unit 110 to start the first inverter circuit unit 110. In this case, the first starter circuit 108 supplies the output voltage of the AC filter / rectifier 102 to the rectifier circuit a of FIG. 4, converts the DC voltage into a DC voltage, and reduces the voltage. Input to the inverter circuit unit 110.

The second starter circuit unit 158 inputs the output voltage of the AC filter / rectifier 102 to the second inverter circuit unit 160 to start the second inverter circuit unit 160.

The first inverter circuit unit 110 is initially operated by the voltage input from the first starter circuit unit 108. The first inverter circuit unit 110 performs high frequency switching according to the first dimming signal input from the first dimming controller 114 to output a high frequency pulse voltage. The high frequency pulse voltage is input to the first resonant circuit unit 116.

In this case, the first inverter circuit unit 110 compares the first dimming signal and the first feedback signal input from the first feedback circuit unit 120 and outputs a high frequency pulse voltage according to a voltage corresponding to the difference.

The second inverter circuit unit 160 is initially operated by the voltage input from the second start circuit unit 158. The second inverter circuit unit 160 performs high frequency switching according to a second dimming signal input from the second dimming control unit 164 to output a high frequency pulse voltage. The high frequency pulse voltage is input to the second resonant circuit unit 166.

In this case, the second inverter circuit unit 160 compares the second dimming signal with the second feedback signal input from the second feedback circuit unit 170 and outputs a high frequency pulse voltage according to a voltage corresponding to the difference.

The first dimming signal receiver 112 receives a first PWM signal from the PWM signal generator 106 and transmits the first PWM signal to the first dimming controller 114.

The second dimming signal receiver 162 receives the second PWM signal from the PWM signal generator 106 and transmits the second PWM signal to the second dimming controller 164.

The first dimming control unit 114 rectifies the first PWM signal input from the first dimming signal receiving unit 112 with a DC power supply to rectify the rectified first dimming signal (ie, the first PWM signal) in the first inverter. Applied to the circuit unit 110.

The second dimming control unit 164 rectifies the second PWM signal input from the second dimming signal receiving unit 162 with a DC power supply to rectify the rectified second dimming signal (ie, the second PWM signal) with the second inverter. Applied to the circuit unit 160.

Here, the first dimming signal receiving unit 112 and the first dimming control unit 114 may be integrated into one configuration, which is the second dimming signal receiving unit 162 and the second dimming control unit 164. The same applies to the case.

The first resonant circuit unit 116 converts the high frequency pulse voltage output from the first inverter circuit unit 110 into a sine wave voltage, and then supplies the first resonant circuit 130 to drive the first lamp 130. Let's do it.

The first resonant circuit unit 116 includes a sine wave conversion circuit for converting the high frequency pulse voltage into a sine wave voltage and a series resonant circuit for supplying the sine wave voltage to the first lamp 130. The series resonant circuit consists of a series connection of a resonant transformer and a capacitor.

Here, when the sine wave voltage output from the sine wave conversion circuit is input to the series resonant circuit, a constant AC voltage is induced in the secondary winding of the resonant transformer and input to the first power supply circuit 118.

The second resonant circuit unit 166 converts the high frequency pulse voltage output from the second inverter circuit unit 160 into a sine wave voltage, and then supplies the second resonant circuit 180 to the second lamp 180 to drive the second lamp 180. Let's do it.

When the second resonant circuit unit 166 converts the high frequency pulse voltage of the second inverter circuit unit 160 into a sine wave voltage, the converted sinusoidal voltage induces a constant AC voltage in the secondary winding of the resonant transformer. . At this time, the induced AC voltage is input to the second power supply circuit unit 168.

The first power supply circuit unit 118 converts the AC voltage induced in the resonance transformer into a DC voltage, and then supplies power to the PFC circuit unit 104 and the first inverter circuit unit 110.

The second power supply circuit unit 168 converts the AC voltage induced by the resonance transformer into a DC voltage, and then supplies power to the PFC circuit unit 104 and the second inverter circuit unit 160.

The first feedback circuit unit 120 detects the output current of the first lamp 130 and transfers the detected output current (ie, the first feedback signal) to the first inverter circuit unit 110.

The second feedback circuit unit 170 detects the output current of the second lamp 180 and transfers the detected output current (ie, the second feedback signal) to the second inverter circuit unit 160.

According to an embodiment of the present invention, a plurality of lamps can be individually dimmed through one electronic ballast. That is, the same effect as using two electronic ballasts can be obtained using one electronic ballast. In this case, since the illuminance and the color temperature can be adjusted for each lamp differently using one electronic ballast, various colors and brightness can be realized.

At this time, since the AC filter / rectifier, the PFC circuit, and the PWM signal generator are commonly used, manufacturing cost can be reduced by reducing the number of components, and the installation work is facilitated because the wiring is reduced during the product installation.

2 is a circuit diagram of an AC filter / rectifier according to an embodiment of the present invention.

Referring to FIG. 2, the AC filter / rectifier 102 is connected to an AC commercial power source (N, L), at which time the overcurrent from the AC commercial power source (N, L) is blocked through the fuse (F1). The AC filter / rectifier 102 includes noise included in the AC commercial power supply N and L through varistors VAR, capacitors CX1, CX2 and CX3, transformers T1 and T2, and an inductor L1. To filter. The AC filter / rectifier 102 rectifies AC commercial power through the bridge diode DB1.

3 is a circuit diagram illustrating a PFC circuit unit, a startup circuit unit, and a power supply circuit unit according to an embodiment of the present invention, and FIG. 4 is a power supply circuit unit, a resonance circuit unit, a dimming signal receiver, and feedback according to an embodiment of the present invention. 5 is a circuit diagram illustrating a circuit unit, and FIG. 5 is a circuit diagram illustrating a dimming control unit, a feedback circuit unit, and an inverter circuit unit according to an exemplary embodiment of the present invention.

Here, one component in the design of the circuit diagram is divided into several drawings. For example, the first power supply circuit unit is divided into FIGS. 3 and 4, and in this case, the first power supply circuit unit and the first power supply circuit unit and the 1-2 power supply circuit unit are respectively illustrated in FIGS. 3 and 4. Divided by. Similarly, the second power supply circuit section is also shown in FIGS. 3 and 4 by dividing into 2-1 power supply circuit section and 2-2 power supply circuit section, respectively. In addition, the first feedback circuit portion and the second feedback circuit portion are shown separately in Figs. 4 and 5, and are described in the same manner as above.

In FIG. 5, a circuit diagram of the first inverter circuit unit, the first dimming control unit, and the 1-2 feedback circuit unit is shown. FIG. 5 also illustrates the case of the second inverter circuit unit, the second dimming control unit, and the second-2 feedback circuit unit. It may be displayed as in 5.

3 to 5, the rectified voltage output from the AC filter / rectifier 102 is a DC voltage in the rectifier circuit a via the resistors R5, VST1, and A points of the first starter circuit 108. After conversion to and reduced in pressure, it is input to the VCC 20 terminal of the inverter IC via J12 (VST). That is, since the rectified voltage output from the AC filter / rectifier 102 is a pulsating voltage of 220 V, the rectified circuit (a) converts the DC voltage to be used in the inverter IC and reduces the voltage. At this time, the inverter IC is started by the voltage input to the VCC (20) terminal of the inverter IC.

The PWM signal generator 106 outputs the first PWM signal PWM 1 to the first dimming signal receiver 112, and outputs the second PWM signal PWM 2 to the second dimming signal receiver 162. do. Hereinafter, only the operation flow associated with the first PWM signal PWM 1 will be described.

The first PWM signal PWM 1 is input from the first dimming signal receiver 112 to the first dimming controller 114 via a photo coupler. The first PWM signal PWM 1 is rectified by the RC rectifying circuit in the first dimming controller 114, and the rectified first dimming signal (ie, the first PWM signal) is input to the inverter IC.

The inverter IC outputs a high frequency pulse voltage by performing high frequency switching according to a first dimming signal input from the first dimming controller 114. At this time, the high frequency pulse voltage is output through the HO 19 terminal and the LO 17 terminal. In the embodiment of the present invention, the first inverter circuit unit 110 uses an inverter IC. In this case, timing control becomes easier when high frequency switching is performed using two switch elements. That is, timing control is facilitated because a delay time can be provided between a high signal and a low signal in the inverter IC.

The high frequency pulse voltage output from the HO 19 terminal is input to the gate of the first FET Q106 in the sinusoidal conversion circuit of the first resonant circuit unit 116 via J2 (DT_10) and J2 (DT). In this case, since the high frequency pulse voltage output from the HO 19 terminal must operate at a high voltage, the high frequency pulse voltage is boosted through the transformer T105 and then input to the gate of the first FET Q106.

The high frequency pulse voltage output from the LO 17 terminal is input to the gate of the second FET Q107 in the sinusoidal conversion circuit of the first resonant circuit 116 via J4 (B5NK50Z_G) and J4 (LOW_FET_G). .

Here, the PFC circuit unit 104 improves the power factor of the rectified voltage output from the AC filter / rectifier 102 and converts the output voltage into a constant DC voltage, where the voltage output from the PFC circuit unit 104 outputs VLK1. Via point B, it is input to the drain of the first FET Q106. In this case, the PFC circuit unit 104 maintains the voltage at the point B at a constant high voltage (for example, 400 V). In this case, the voltage output from the PFC circuit unit 104 serves to supply power to the first FET Q106.

The high frequency pulse voltage output from the inverter IC is converted into a sine wave voltage in the first FET Q106 and the second FET Q107. The converted sinusoidal voltage is input to the first lamp 130 through the series resonance circuits T104 and C125 of the first resonant circuit unit 116 to drive the first lamp 130.

On the other hand, when the converted sinusoidal voltage is input to the series resonant circuit, an AC voltage is induced in the secondary winding of the resonant transformer T104 of the series resonant circuit and input to the 1-2 power supply circuit 118-2. do.

The 1-2 power supply circuit 118-2 rectifies the induced AC voltage through the rectifier circuit b. The voltage rectified by the rectifier circuit (b) is input to the 1-1st power supply circuit unit 118-1 of VFB1 at point C, and the PFC circuit unit (1) at the 1-1st power supply circuit unit 118-1. 104). That is, the induced AC voltage supplies power to the PFC circuit unit 104 through the first power supply circuit unit 118.

In addition, the voltage rectified by the rectifier circuit b is input to the inverter IC through the resistor R118 and the diode D120 to supply power to the first inverter circuit unit 110. That is, the induced AC voltage supplies power to the first inverter circuit unit 110 through the first power supply circuit unit 118.

The first-first feedback circuit unit 120-1 detects the output current of the first lamp 130. The detected current is input to the 1-2 feedback circuit portion 120-2 of the JB (FB), and the EA (−) terminal 9 of the inverter IC is input from the 1-2 feedback circuit portion 120-2. Is entered.

In this case, the inverter IC is input to the EA (+) terminal 10 from the first feedback signal of the first lamp 130 input to the EA (−) terminal 9 and the first dimming controller 114. The first dimming signal is compared and the high frequency pulse voltage according to the voltage corresponding to the difference is output.

According to an embodiment of the present invention, since the two lamps are driven by different dimming signals, dimming control is possible for each lamp through one electronic ballast.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

102: AC filter / rectifier 104: PFC circuit
106: PWM signal generator 108: first start circuit
110: first inverter circuit unit 112: first dimming signal receiving unit
114: first dimming control unit 116: first resonant circuit unit
118: first power supply circuit portion 120: first feedback circuit portion
130: first lamp 158: second starting circuit unit
160: second inverter circuit unit 162: second dimming signal receiving unit
164: second dimming control unit 166: second resonant circuit unit
168: second power supply circuit section 170: second feedback circuit section
180: second lamp

Claims (6)

An AC filter / rectifier for removing noise of AC commercial power and rectifying the AC commercial power;
A PFC circuit unit for improving the power factor of the rectified voltage output from the AC filter / rectifier and converting the rectified voltage to a DC voltage;
A PWM signal generator which receives a PWM control signal from the outside and generates at least two different PWM signals;
Two or more dimming controllers respectively receiving the PWM signals and rectifying the received PWM signals to generate dimming signals, respectively;
Two or more inverter circuits each receiving the dimming signal and outputting a high frequency pulse voltage by performing high frequency switching according to the dimming signal;
Two or more resonant circuit units for converting the high frequency pulse voltages into sinusoidal voltages and supplying the lamps to the respective lamps to drive the corresponding lamps;
Two or more power supply circuit units respectively connected to the two or more resonant circuit units and supplying power to the PFC circuit unit and the two or more resonant circuit units, respectively; And
And two or more feedback circuits connected to each of the lamps to detect an output current of each lamp and to feed back the detected currents to the two or more inverter circuits, respectively.
The method of claim 1,
The electronic dimming ballast,
Further comprising at least two starter circuit for converting the rectified voltage output from the AC filter / rectifier to a DC voltage and to reduce the pressure,
And said at least two starting circuit portions respectively input said converted and decompressed DC voltages into said at least two inverter circuit portions to start up said inverter circuit portion.
The method of claim 1,
The PWM signal generator,
And receive the PWM control signal via wireless communication.
The method of claim 1,
Each of the two or more resonant circuits,
A sinusoidal wave conversion circuit for converting the high frequency pulse voltage into a sinusoidal wave voltage; And
It includes a series resonant circuit for supplying the converted sinusoidal voltage to the lamp,
The series resonant circuit includes a resonant transformer connected to the sinusoidal wave conversion circuit and a capacitor connected to the resonant transformer.
The method of claim 4, wherein
Each of the two or more power supply circuits,
And a secondary winding of the resonant transformer and rectifying an AC voltage induced in the secondary winding of the resonant transformer to supply power to the PFC circuit unit and the two or more resonant circuit units.
The method of claim 1,
Each of the two or more dimming control unit,
And an RC rectifying circuit for RC rectifying the received PWM signal.

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