KR20000060837A - Eletric Ballsat of Possibility Dimming - Google Patents

Abstract

PURPOSE: A stabilizer for fluorescent lamps is provided to enable luminance adjustment by using an electric power amplifier unit and a variable circuit unit. CONSTITUTION: Electric power is rectified in a power supplying unit to be supplied in DC electric power. An oscillation device(25) is supplied with the DC electric power from the power supplying unit to oscillate the same. A variable circuit(26) varies frequency of the oscillation device(25). A free amp circuit(27) outputs FET control signal. The electric power is output in an electric power amplifying circuit(28), signal converted in the variable circuit(26), resonated in a resonance circuit(29) and output to an output side(30), then discharge of lamp is performed. When voltage of the output side(30) is higher than that of the electric power supply, the electric current corresponding to the exceeding voltage is bypassed and used in the power supply again.

Description

Electronic Fluorescent Ballast with Adjustable Illumination {Eletric Ballsat of Possibility Dimming}

The present invention relates to an electronic fluorescent ballast that is capable of adjusting the illuminance. When the circuit illustrated in FIG. 1 is described in detail, power is supplied to the power input side and power amplified by removing ripples from the smoothing circuit. The current that is sent to the negative side and output to the oscillating circuit portion is rectified and supplied to 15v by the power supply circuit 24. The supplied current is changed in illuminance according to the state of change by the variable circuit. When the variable current is amplified by the power amplifier and resonated in the resonant circuit, the current waveform is modulated close to the sine waveform and supplied to the output side to discharge the fluorescent lamp. To give.

The purpose of the present invention relates to a ballast that can adjust the illuminance of the fluorescent lamp, and the conventional ballast has a low illuminance control range even when the illuminance of the fluorescent lamp cannot be adjusted or the illuminance can be controlled. In this case, the purpose of the present invention is to provide an electronic fluorescent ballast which is capable of controlling the illumination without any problem because the change in the illumination is naturally changed even when the illumination control is over 80%.

The present invention relates to an electronic fluorescent light ballast, and relates to an electronic fluorescent light ballast capable of controlling illumination using a power amplifier and a variable circuit.

Fluorescent lamps are used as light sources in many places and are being researched and developed in all of you. The discharge of the fluorescent lamp emits the accumulated energy as ultraviolet rays when the electrons strike the mercury particles in the tube between the electrodes to excite the mercury electrons and return again. The light is emitted by hitting the right phosphor inside the lamp. Thus, in order to turn on the fluorescent lamp, the structure of the glow start, ballast, switch, etc. can be integrated. Such a fluorescent lamp is not discharged only by applying a voltage (AC100-220V) to both ends of the electrode. Different starters are required and are classified into gloss starter type, rapid starter type, and high frequency type lighting method depending on the type of starter. In the conventional lamp lighting method, when a voltage is applied to both ends of the fluorescent lamp, the glow discharge starts at the starter, and the contact is closed as the bimetal electrode is extended by the heat of the glow discharge. In this way, when the contact is closed, the current flowing in the ballast changes, and a high voltage is generated at the inductance in the coil, and this voltage is applied to the electrode to discharge the lamp. In addition, since the current flows to the lamp electrode and the ballast and the glow discharge is stopped, the contact is cooled and the bimetal is returned to its original state. At this time, the instantaneous high voltage is generated and the lamp is turned on.

In the conventional fluorescent ballast, it was not possible to adjust the illuminance. The reason is that to adjust the illuminance of the fluorescent lamp, it is necessary to adjust the voltage. When the voltage falls below the discharge start voltage, the illuminance is not controlled. Dimming is impossible. The present invention was devised to solve such a problem, and an object of the present invention is to provide an electronic fluorescent lamp stabilizer that is capable of adjusting illuminance using a power amplifier and a variable circuit.

1 is a circuit diagram of the present invention

<Explanation of Signs of Major Parts of Drawings>

21 input side 22 rectification circuit 23 smoothing circuit 24 power supply circuit

26 variable circuit 25 oscillation element 27 preamplifier circuit 28 power amplifier circuit

29 resonance circuit 30 output side 31 bypass circuit

In order to achieve the above object, the electronic fluorescent lamp ballast function of illuminance control function of the present invention rectifies and smoothes the power supply to supply DC power and the oscillator circuit part to receive the DC power output from the power supply to oscillate the frequency signal. And a frequency variable circuit section for varying the oscillation frequency of the oscillation circuit section, a current amplifier circuit section for amplifying current oscillated at a constant frequency, and a resonant circuit section for resonating and modulating the current output from the current amplifier circuit section to a sine wave. There is a feature that is configured on the output side for supplying the current to the lamp.

As such, the present invention will be described in detail with reference to the attached FIG. 1 of the electronic fluorescent ballast, in which illuminance is adjustable.

The electronic fluorescent ballast of the present invention is an electronic ballast that enables illumination control using FETs and variable circuits. It controls the illumination by varying the oscillation frequency of the oscillation element and controls the changed current in the preamplifier circuit by reversing the two FETs. When it outputs, the FET amplifies the current and sends it to the resonant circuit. In the resonant circuit, the waveform is modulated close to the sine wave and sent to the output side to turn on the lamp.

Referring to the operation of the electronic ballast capable of adjusting the illuminance of the present invention in detail, when the power supply (AC100-240V, 50-60Hz) is applied to the input side 21, the ripple of the waveform is smoothed in the smoothing circuit 23 via the rectifying circuit 24. It is removed and sent to the current amplifier circuit 28, the output between the input power circuit 21 and the rectifier circuit 22 through the oscillation device power supply circuit 24 through the 221 rectified to 15V DC supply to the oscillation device 25 The range of the frequency oscillated by the oscillation element 25 is 50-200 kHz. When this frequency is changed in the variable circuit 26, the frequency output from the oscillation element 25 becomes variable to the preamplifier circuit 27. The two FETs in the power amplification circuit 28 are configured as reversible circuits in the preamplifier circuit 27 so that when one FET operates, the other one stops working. When the action is repeatedly outputted, the resonant circuit (2 In step 9), the current waveform is made close to the sine waveform and sent to the output side 30. At the output side 30, if the voltage of the output side 30 is higher than the input voltage, the current flows back to the bypass circuit 31 to balance the voltage and make the current flow backward. Can regain its energy savings by acting as a power source.

As described above, in the electronic fluorescent lamp ballast capable of adjusting the illuminance of the present invention has the following effects.

First, it is possible to adjust the illuminance of fluorescent lamp freely, and secondly, it is widely used. Second, it is discharged by high frequency current, so it does not need to be preheated, and it can be used without the need for filament in the lamp. At the time, the current is reversed by the bypass circuit, thereby saving the current.

Claims (6)

A power supply unit for rectifying and smoothing the power supply to the DC power supply, an oscillation circuit receiving and oscillating the DC power output from the power supply unit, a variable circuit for varying the frequency of the oscillation circuit, and a preamplifier circuit for FET control signal And a power amplification circuit using a FET, a resonant circuit using a transformer and a capacitor, and a bypass circuit for reducing power by bypassing overcurrent on the output side. The electronic ballast of claim 1, wherein the illumination intensity is controlled by varying the frequency of the oscillation circuit to 50-200 kHz. 2. The electronic ballast of claim 1, wherein the rectifier is rectified at the input side to remove ripples of the waveform by the smoothing circuit and then is supplied to the current amplifier circuit. 3. The electronic ballast of claim 2, wherein the FET control is controlled by a preamplifier circuit for the high frequency current varied in the oscillation circuit. The electronic ballast of claim 1, wherein the FET amplifies 15 V into 220 V of power and resonates the amplified current with a capacitor and a transformer to approximate a sine wave. 6. The illumination control according to claim 5, wherein the bypass circuit is a saving circuit that bypasses a large amount of power when the output of the resonant circuit resonating in the resonant circuit is higher than the voltage on the input side and reuses it as a power source. Electronic ballast.