KR20100119160A - Driving apparatus of invertor for capacitive load - Google Patents

Driving apparatus of invertor for capacitive load Download PDF

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Publication number
KR20100119160A
KR20100119160A KR1020090038122A KR20090038122A KR20100119160A KR 20100119160 A KR20100119160 A KR 20100119160A KR 1020090038122 A KR1020090038122 A KR 1020090038122A KR 20090038122 A KR20090038122 A KR 20090038122A KR 20100119160 A KR20100119160 A KR 20100119160A
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KR
South Korea
Prior art keywords
inverter
voltage
capacitive load
output
output voltage
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KR1020090038122A
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Korean (ko)
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황경득
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황경득
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Priority to KR1020090038122A priority Critical patent/KR20100119160A/en
Publication of KR20100119160A publication Critical patent/KR20100119160A/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2824—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation

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  • Inverter Devices (AREA)

Abstract

The present invention relates to an inverter driving device for a capacitive load, and provides an inverter driving device for a capacitive load that can adjust the voltage and frequency of a power supply while simultaneously limiting current flowing into a capacitive load such as a light emitting sheet. do. In accordance with an aspect of the present invention, an inverter driving apparatus for a capacitive load includes: a rectifying unit configured to rectify an input external AC voltage into a DC voltage; An inverter for converting the DC voltage into an AC voltage for applying a capacitive load; A control unit for generating a control signal of the inverter as a pulse withd modulation (PWM) signal, and controlling the output of the inverter to be a sine wave in the form of a stair wave according to the width and the period of the generated PWM signal; And a filter unit filtering the output of the inverter and outputting a shaped sine wave. According to the above configuration, the present invention can extend the life of the capacitive load and at the same time reduce the heat loss due to power loss during the sine wave shaping process, and the brightness of the capacitive load due to the dispersion occurring in the manufacturing process. Can be adjusted in the same way, it is possible to reduce the manufacturing cost by not requiring a high-precision / high output device, and at the same time has the effect of minimizing the error due to temperature changes and voltage fluctuations.

Description

Inverter driving device for capacitive loads {Driving apparatus of invertor for capacitive load}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter driving device for a capacitive load. In particular, the present invention relates to a power supply for a capacitive load, such as a light emitting sheet, by using a conventional sine wave to limit the current flowing into the capacitive load at the same time. The present invention relates to an inverter drive device for a capacitive load that can adjust a width and a cycle to adjust a voltage and a frequency of a power supply.

Inorganic EL (Electro Luminescene) sheets or light emitting sheets, which have recently been spotlighted in the display field, are active light sources that emit light when an electric field is applied to the phosphor material, and applies an alternating voltage to a transparent organic film or linear structure coated with the light emitting phosphor. In this case, due to the generated electric field, the movement of electrons is seen as light through a fast charge / discharge process of the phosphor, which is a capacitive load because of its characteristics.

Such a light emitting device is usually operated at a voltage of AC 100 ~ 240V and a frequency of 60 ~ 4000 kHz, the inverter as a power supply to control the brightness and the flashing speed of the light emitting device by varying the output voltage and its frequency.

6 is an output waveform diagram of a conventional inverter.

As shown in FIG. 6, the inverter converts an input DC voltage into an AC of square wave through a PWM (Pulse Width Modulation) IC, and converts a square wave through a half bridge or a full bridge and an inductor. Convert to a sine wave.

However, since the inverter for a capacitive load such as a conventional light emitting sheet or an inorganic E / L sheet is controlled by a square wave, it is not easy to adjust the output voltage and frequency of the inverter according to the situation.

In addition, the conventional inverter requires an inductor having a very large capacity in order to shape the square wave (a) into a sine wave (b), as shown in Figure 6, and thus the loss corresponding to the hatching area of Figure 6 (b) Due to the large amount of electricity loss and heat generated, the heat loss is large, and heat release is difficult.

In addition, the capacitive load does not receive a standardized sine wave, thereby increasing the impact current and consequently shortening the lifetime.

In addition, the impedance mismatch between the inductor and the capacitive load causes the output voltage to rise or fall according to the capacitance of the capacitive load, so that the voltage fluctuation rate is large according to the size of the capacitive load, and furthermore, the capacitive load for impedance matching. There is a problem that the value of the inductor should be changed according to the size of.

In addition, since the output voltage of the inverter is determined only by the input voltage, there is a problem of operating only for a predetermined input voltage.

The present invention has been proposed to solve the above problems, to provide a capacitive load inverter drive device that can extend the life of the capacitive load, and can easily control the voltage and frequency applied to the capacitive load For the purpose of

In order to achieve the above object, the present invention provides a drive device for a capacitive load, comprising: a rectifying unit for rectifying an input external AC voltage into a DC voltage; An inverter for converting the DC voltage into an AC voltage for applying a capacitive load; A control unit for generating a control signal of the inverter as a PWM signal and controlling the output of the inverter to be a sine wave in the form of a stair wave according to the width and the period of the generated PWM signal; And a filter unit filtering the output of the inverter and outputting a shaped sine wave.

Preferably, the voltage converter may further include a transformer for boosting the output voltage of the inverter at a predetermined ratio.

Preferably, the apparatus may further include a detector configured to detect an output voltage of the filter unit, and the controller may control an output voltage of the inverter according to a detection result of the detector.

Preferably, the control unit may further include a voltage divider configured to divide the output voltage of the rectifier at a predetermined ratio, and the controller may control the output voltage of the inverter based on the DC voltage divided by the voltage divider.

Preferably, the apparatus further includes a switch unit for selecting an output voltage and frequency of the inverter according to a user's selection, and the controller may change the output voltage and frequency of the inverter according to the selection of the switch unit.

Preferably, the inverter includes a current transformer for releasing the input terminal current of the inverter, a capacitor charged according to the induced current of the current transformer, and switching means turned on by whether the capacitor is charged, and an overcurrent for preventing overcurrent applied to the inverter. It may further comprise a protection.

Preferably, the filter unit may be an inductor.

Preferably, the capacitive load may be an EL (Electro-Luminescene) sheet or a light emitting sheet.

Preferably, the inverter may include a half bridge driver and two switching means driven by the half bridge driver.

Preferably the inverter may comprise a full bridge driver and four switching means driven by the full bridge driver.

The inverter driving device for capacitive loads according to the present invention controls the inverter to output a sine wave in the form of a stair wave, and shapes it into a sine wave to reduce the impact current of the capacitive load such as a light emitting sheet, thereby extending the life of the capacitive load. At the same time, there is an effect that can reduce the electrical loss and thereby the heat loss of the sine wave shaping process.

In addition, the present invention can adjust the voltage and frequency applied to the capacitive load by controlling the pulse width and the period for the control signal of the inverter, it is possible to equally adjust the brightness of the capacitive load due to the dispersion occurring in the manufacturing process.

In addition, the present invention detects the input voltage and controls the output of the inverter accordingly, whereby a free voltage input that is not limited by the input AC voltage is possible.

In addition, the present invention can detect a voltage applied to the capacitive load and control the output of the inverter accordingly, so that even when the capacitive load is changed, a voltage suitable for the same can be provided without changing other configurations.

In addition, the present invention generates a control signal of the inverter by a program, the components such as the inductor, inverter, transformer, etc. do not require a high-precision / high-output device to reduce the manufacturing cost and at the same time to the temperature change and voltage fluctuations There is an effect that the error is minimized.

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

1 is a schematic block diagram of an inverter driving apparatus for a capacitive load according to an embodiment of the present invention.

The inverter driving device 100 for a capacitive load includes a rectifier 110 for rectifying an AC voltage to a DC voltage, a voltage divider 120 for dividing an output voltage of the rectifier 110, and an overcurrent applied to the inverter 160. Overcurrent protection unit 130 to prevent the control unit, the control unit 140 for controlling the output of the inverter 160, the switch unit 150 for adjusting the output voltage and frequency of the inverter 160, and direct current voltage Inverter 160 for converting the voltage, the transformer 170 for boosting the output of the inverter 160, the filter unit 180 for filtering the output of the transformer 170, and the capacitive load 200 The detector 190 detects an applied voltage.

Here, the capacitive load 200 includes a light emitting sheet or an inorganic EL sheet.

This will be described in more detail with reference to FIG. 2.

2 is a circuit diagram illustrating an example of a detailed configuration of an inverter driving apparatus for a capacitive load according to an embodiment of the present invention.

The rectifier 110 converts an AC voltage input from the outside into a direct current, and includes a bridge diode for full-wave rectifying the AC voltage and a smoothing capacitor for removing an output ripple of the bridge diode.

The voltage divider 120 divides the output voltage of the rectifier 110 at a constant ratio. For example, as shown in FIG. 2, the ratio of two resistors R1 and R2 connected in series with the rectified DC voltage is shown. The pressure is divided according to the control unit 140 and output.

The overcurrent protection unit 130 is turned on by the current transformer CT that induces the input terminal current of the inverter 160, the capacitor C that is charged according to the induced current of the current transformer CT, and whether the capacitor C is charged. Switching means TR.

When the current flows between the rectifier 110 and the inverter 160, the overcurrent protection unit 130 induces a current in the secondary side of the current transformer CT. When the induced current is small, the overcurrent protection unit 130 is charged in the capacitor C. When the voltage is discharged through the resistor R4 and the induced current is large, the capacitor C is charged through the diode D. When the charged charge rises by a predetermined value or more, the transistor TR is turned on to output the output. It is input to the controller 140. In this case, the controller 140 blocks the control signal of the high voltage gate driver 162 to block the operation of the inverter 160. Here, the current set value for the overcurrent determination is determined by the values of the resistor (R4) and the capacitor (C).

PWM  Output voltage and frequency control according to pulse width and period of signal

The controller 140 includes a programmable CPU, an AVR, a DSP, and the like, and controls the output of the inverter 160 to be a sine wave in the form of a staircase wave. For this purpose, the controller 140 generates a PWM signal and uses it as a control signal of the inverter 160. .

That is, the controller 140 controls the output voltage and the frequency of the inverter 160 according to the pulse width and the period of the PWM signal, adjusts the output voltage by changing the pulse width of the PWM signal, and changes the output period by changing the pulse period. Adjust it. Here, the pulse width and period are preferably set in advance by a program and changed according to the detection result as described later.

In addition, the controller 140 controls the output voltage of the inverter 160 based on the DC voltage divided by the voltage divider 120, and the voltage of the voltage divider resistor R2 is equal to the ADC (Analog Digital Converter) of the controller 140. ) To calculate the external input voltage applied to the rectifier 110 through the ADC, and to control the output voltage of the inverter 160 by changing the pulse width of the PWM signal according to the magnitude of the external input voltage. That is, it checks whether the current input voltage is AC 110V or 220V and adjusts the output voltage of the inverter 160 accordingly.

In addition, the controller 140 controls the output voltage and the frequency of the inverter 160 according to the selection of the switch unit 150. The frequency is increased or decreased by the frequency adjusting switches S3 and S4, and the voltage adjusting switches S5, The voltage is increased or decreased by S6).

That is, when the frequency increase switch S3 is turned on by the user, the controller 140 counts to increase the pulse period of the PWM signal, and when the frequency decrease switch S4 is turned on, decreases the pulse period of the PWM signal. In addition, when the voltage increase switch S5 is turned on by the user, the controller 140 counts to increase the pulse width of the PWM signal, and when the voltage decrease switch S6 is turned on, decreases the pulse width of the PWM signal.

Here, the control unit 140 controls the increase and decrease step by step each time each switch (S3 ~ S6) is turned on once, and if each switch (S3 ~ S6) is continuously kept in the ON state to continuously count and PWM The pulse width and period of the signal can be gradually increased or decreased.

In addition, the control unit 140 controls the output voltage of the inverter 160 according to the detection result of the detection unit 190. The voltage divided by the detection resistors R7 and R8 is input to the ADC of the control unit 140, When the voltage across both of the capacitive loads 200 is calculated and the voltage between both ends of the capacitive load 200 is less than or equal to a preset value, the pulse width is increased to increase the output voltage of the inverter 160. That is, when the voltage supplied to the capacitive load 200 is changed according to the variation of the capacitive load 200 or the distribution occurring in the manufacturing process, the output of the inverter 160 is controlled by changing the pulse width of the PWM signal.

As described above, the switch unit 150 receives a user's selection for controlling the output voltage and the frequency of the inverter 160, and includes the frequency increase / decrease switches S3 and S4 and the voltage increase / decrease switches S5,. S6). Here, each switch (S3 ~ S6) may be configured as a push button, a single step of increase / decrease is input, if pressed continuously, a progressive increase / decrease is input.

harp bridge  inverter

The inverter 160 converts the DC voltage into an AC voltage for applying the capacitive load 200, and the output voltage is varied by the controller 140 between 100 and 150V frequency between 400 and 1000 Hz.

The inverter 160 is a half bridge driver 162 for driving the switching means (S1, S2) in accordance with the PWM signal of the control unit 140 and the switching means (S1, S2) connected in series with each other and grounded connection point. Include. Here, the half bridge driver 162 may be configured as a high voltage gate driver IC, and the switching means S1 and S2 may be configured as field effect transistors (FETs).

In addition, the inverter 160 turns on and off the switching means S1 and S2 according to the PWM signal of the controller 140. For example, when the high voltage gate driver 162 outputs a high (H) signal, the switching means ( S1 is turned on and the switching means S2 is turned off to apply a DC voltage to the transformer T through a path formed by the transformer T, which is the transformer 170, and the switching means S1, and low L. When the signal is output, the switching means S1 is turned off and the switching means S2 is turned on to apply a DC voltage to the transformer T through a path formed by the transformer T and the switching means S2.

The transformer 170 boosts the output voltage of the inverter 160 by a constant ratio and consists of a transformer T. Since the PWM signal is switched at a high speed, the transformer T may be manufactured to have a small size by using a ferrite core. have. Here, there is an advantage that the size of the transformer (T) can be manufactured to less than one tenth. The transformer 170 may be included or omitted according to the external input voltage. For example, the transformer 170 may be included in the 110V input and omitted in the 220V input.

The filter unit 180 outputs a standardized sine wave by filtering the output of the inverter 160, and preferably, may be configured as an inductor (L). In this case, since the inductor L filters the output of the inverter 160, that is, the sine wave in the form of a staircase wave with a standardized sine wave, it is preferable that the inductor L has a value that is smaller than that of the related art and thus is about 1/10 smaller.

The detection unit 190 detects the output voltage of the filter unit 180, and the detection resistors R7 and R8 are provided at both ends of the capacitive load 200, and according to the ratio of the detection resistors R7 and R8. The divided voltage is input to the ADC of the controller 140.

3 is a circuit diagram showing another example of a detailed configuration of an inverter driving apparatus for a capacitive load according to an embodiment of the present invention.

pool bridge  inverter

Since the configuration of the present embodiment except for the inverter 360 is the same as that of the example of FIG. 2, the description thereof is omitted here.

The inverter 360 includes a full bridge driver 362 for driving the switching means S1 to S4 according to the PWM signal of the controller 340, and two pairs of switching means S1 to S4 connected in series with each other.

Here, the full bridge driver 362 includes a high voltage gate driver IC, and outputs a first driving signal according to the PWM signal of the controller 340 and a second driving signal in which the first driving signal is inverted.

Switching means (S1 ~ S4) may be composed of a FET, the connection point of the switching means (S3, S4) connected in series with the connection point of the series connected switching means (S1, S2) is connected to the transformer (T).

The inverter 360 turns on and off the switching means S1 to S4 according to the PWM signal of the controller 340. For example, the high voltage gate driver 362 is turned high to the switching means S1 and S4. Outputting a signal and outputting a low (L) signal to the switching means (S2, S3), the pair of switching means (S1, S4) is turned on, the other pair of switching means (S2, S3) is turned off and the switching means The DC voltage is applied to the transformer T through the path formed by the step S1, the transformer T, and the switching means S4.

In addition, when the high voltage gate driver 362 outputs a low signal to the switching means S1 and S4 and a high signal to the switching means S2 and S3, the pair of switching means S2, S3) is turned on, and the other pair of switching means S1, S4 is turned off so that a direct current voltage is transferred to the transformer T through a path formed by the switching means S3, transformer T, and switching means S2. Is authorized.

The operation of the capacitive load inverter driving apparatus 100 according to the embodiment of the present invention configured as described above will be described with reference to FIGS. 4 and 5.

4 is a signal waveform diagram of a main point for explaining the operation of the capacitive load inverter driving apparatus according to an embodiment of the present invention, Figure 5 is an operation of the capacitive load inverter driving apparatus according to an embodiment of the present invention. This is a signal waveform diagram of the main points for explaining.

Staircase  Form Sine wave  Formalized Sine wave  produce

When the AC power in the range of 85 to 245V is input to the rectifier 110, the rectifier 110 full-wave rectifies the AC voltage input through the bridge diode, and removes the ripple of the full-wave rectified voltage through the smoothing capacitor to reduce the DC voltage. Output

The voltage dividing unit 120 divides the DC voltage and outputs the divided voltage to the controller 140 and outputs the DC voltage to the inverter 160. At this time, the controller 140 determines the pulse width of the PWM signal according to whether the input voltage is 110V or 220V and outputs a control signal as shown in FIG. 4A to the high voltage gate driver 162 of the inverter 160. do. At this time, the high voltage gate driver 162 drives the switching means S1 to S4 according to the PWM signal.

That is, the half bridge inverter 160 of FIG. 2 drives the switching means S1 and S2 according to the PWM signal of the controller 140 and outputs a sine wave in the form of a step wave as shown in FIG. 5B. Here, the PWM signal of FIG. 4 (a) has a characteristic that the pulse width starts gradually with a short pulse width, and then the pulse width decreases again, and the switching means S1 and S2 are turned on and off according to the signal. A sine wave in the form of a staircase wave which is gradually increased and decreased in proportion to the pulse width is output.

In addition, the full bridge inverter 360 of FIG. 3 drives the switching means S1 to S4 according to the first driving signal and the second driving signal corresponding to the PWM signal of the controller 340 to output a sine wave in the form of a step wave. do. Here, the first drive signal simultaneously turns on the pair of switching means S1 and S4, and the second drive signal simultaneously turns on the other pair of switching means S2 and S3.

According to the switching operation as described above, a sine wave in the form of a step wave is input to the primary side of the transformer T, and a voltage in which the voltage is boosted or reduced in accordance with a constant step-up ratio, for example, the turn ratio of the transformer T, is transformed. It is output to the secondary side of (T). The inductor L filters the sine wave in the stepped wave form to generate a shaped sine wave as shown in FIG. 5C and applies it to the capacitive load 200.

In this operation, since a sinusoidal wave is formed by using a sine wave in the form of a stair wave, it is possible to prolong the life by preventing shock current in the capacitive load 200, and as shown in FIG. Since the corresponding electrical loss and the resulting heat loss are smaller than in the related art, the inductor L having a low capacity can be adopted, and since the PWM signal uses high frequency, the manufacturing cost can be reduced by reducing the transformer size by about 1/10. Can be.

Voltage regulation according to input voltage and output voltage

On the other hand, the voltage dividing unit 120 divides the DC voltage and outputs it to the control unit 140, and the control unit 140 calculates the input voltage of the rectifying unit 110 by the input voltage dividing voltage to determine whether the input voltage is 110V or 220V. To judge.

By this operation, the external input voltage can be used as the prevolt, and the voltage supplied to the capacitive load 200 can be uniformly controlled in response to the change in the input voltage.

In addition, the output voltage of the inductor L, that is, the input voltage of the capacitive load 200 is input to the controller 140 by the divided voltage of the detection resistors R7 and R8, and the controller 140 controls the capacitive load ( The pulse width of the PWM signal is adjusted to calculate the input voltage of 200 to provide a voltage suitable for the size of the capacitive load 200.

By this operation, even if the brightness is different due to dispersion in the manufacturing process of the capacitive load 200, it is possible to control the input voltage and frequency of the capacitive load 200 to adjust the same brightness without changing the other configuration, the capacitive load Since the input voltage of 200 is detected and controlled, it can be accurately controlled.

In addition, the control unit 150 adjusts the output voltage of the inverter 160 and its frequency according to a user's selection. When the increase / decrease switch corresponding to the voltage and frequency is pressed, the controller 140 according to the corresponding input. The pulse width and period of the PWM signal are increased / decreased in steps to control the output voltage of the inverter 160. In this case, the switch unit 150 may continuously press the switch so that the controller 140 may gradually increase or decrease the speed of increasing or decreasing the voltage or frequency corresponding to the switch.

By changing the frequency and the voltage by the operation through the program of the controller 140, the error due to the temperature change and the voltage change can be minimized.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is understood that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

1 is a schematic block diagram of an inverter driving apparatus for a capacitive load according to an embodiment of the present invention,

2 is a circuit diagram illustrating an example of a detailed configuration of an inverter driving apparatus for a capacitive load according to an embodiment of the present invention.

3 is a circuit diagram showing another example of a detailed configuration of an inverter driving apparatus for a capacitive load according to an embodiment of the present invention;

4 is a signal waveform diagram of a main point for explaining the operation of the inverter drive device for a capacitive load according to an embodiment of the present invention,

5 is a signal waveform diagram of a main point for explaining the operation of the capacitive load inverter driving apparatus according to an embodiment of the present invention,

6 is an output waveform diagram of a conventional inverter.

Explanation of symbols on the main parts of the drawings

100: inverter drive device for capacitive load 110: rectifier

120: voltage divider 130: overcurrent protection unit

140: control unit 150: switch unit

160: inverter 170: transformer

180 filter unit 190 detection unit

200: capacitive load

Claims (10)

In the inverter drive device for capacitive load, A rectifier for rectifying the input external AC voltage into a DC voltage; An inverter for converting the DC voltage into an AC voltage for applying a capacitive load; A control unit for generating a control signal of the inverter as a PWM signal and controlling the output of the inverter to be a sine wave in the form of a stair wave according to the width and the period of the generated PWM signal; And a filter unit for filtering the output of the inverter and outputting a standardized sine wave. The method of claim 1, And a transformer for boosting the output voltage of the inverter at a constant ratio. The method of claim 1, Further comprising a detection unit for detecting the output voltage of the filter unit, And the control unit controls the output voltage of the inverter according to the detection result of the detection unit. The method of claim 1, Further comprising a voltage divider for dividing the output voltage of the rectifier at a constant ratio, And the control unit controls the output voltage of the inverter based on the DC voltage divided by the voltage dividing unit. The method of claim 1, Further comprising a switch unit for selecting the output voltage and frequency of the inverter according to the user's selection, And the control unit changes the output voltage and frequency of the inverter according to the selection of the switch unit. The method of claim 1, A current transformer configured to induce an input current of the inverter, a capacitor charged according to an induced current of the current transformer, and switching means turned on by charging the capacitor, and an overcurrent protection unit for preventing an overcurrent applied to the inverter. Inverter drive device for a capacitive load comprising a. The method of claim 1, Inverter drive device for a capacitive load, characterized in that the filter unit is an inductor. The method of claim 1, And the capacitive load is an EL (Electro-Luminescene) sheet or a light emitting sheet. The method of claim 1, And said inverter comprises a half bridge driver and two switching means driven by said half bridge driver. The method of claim 1, And said inverter comprises a full bridge driver and four switching means driven by said full bridge driver.
KR1020090038122A 2009-04-30 2009-04-30 Driving apparatus of invertor for capacitive load KR20100119160A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101714573B1 (en) * 2015-09-25 2017-03-09 국방과학연구소 Apparatus for driving analog inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101714573B1 (en) * 2015-09-25 2017-03-09 국방과학연구소 Apparatus for driving analog inverter

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