JP2005078825A - Electronic ballast - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic ballast having functions that have never been achieved by a conventional electronic ballast. <P>SOLUTION: This electronic ballast is provided with a high-frequency output transformer, a frequency modulation/power amplification circuit, and a high-frequency ballast and a capacitor, and as for the high-frequency output transformer among them, the frequency modulation/power amplification circuit is connected to a primary side, N-pairs of high frequency ballasts and capacitors are connected to a secondary side, and the high frequency ballasts and capacitors are matched with the secondary side, respectively, by differences in lamp voltages and lamp currents of respective lamps. When N-pairs of the lamps in the electronic ballasts which are set up with constituent requirements mentioned above are lighted, adjustments are carried out so that a necessary voltage is outputted by the output transformer as required without affecting the power amplification circuit of the primary side, irrespective of whether the lamp voltages and the lamp currents of the respective lamps are all the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a kind of electronic ballast, and in particular, the electronic ballast can be used for any lamp voltage and lamp current discharge lamp by special structure composition of high frequency output transformer, frequency modulation / power amplification circuit, high frequency inductor and capacitor. The present invention relates to an electronic ballast that can ensure the practical effect of the minimum temperature rise and stable lighting of the entire circuit even if the lamps are one-to-one, one-to-many, or one-to-many different lamps.

In general known electronic ballasts, as shown in FIG. 5, an inductor L2 is connected in series to a frequency modulation circuit, and the constant current lighting system is considered that the lamp is one component in one circuit. If the lamp fluctuates, it can easily cause a bad circuit response. In this circuit, the number of lamps that can be lit is limited because the voltage is limited to the power supply voltage.
Therefore, there is a need for an electronic ballast that can be applied to each type of lamp and can ensure the stability of the entire circuit.

  That is, the main object of the present invention is to provide a kind of electronic ballast. It comprises a high frequency output transformer, a frequency modulation / power amplification circuit, a high frequency inductor and a capacitor, and the high frequency output transformer has a frequency modulation / power amplification circuit connected to the primary side and N sets of high frequency inductors on the secondary side And a capacitor (IC and MOSFET are used) are connected. The high frequency output transformer is the main load, and the vibration frequency is determined by the IC. The high-frequency output transformer only has to consider the matching with the attached lamp, and the load matching may be matched with the characteristics of the lamp voltage and the lamp current of the load lamp. The difference between the electronic ballast of the present invention and a general electronic ballast is that the output power lamp load is one high-frequency output transformer. There is no DC flow, so either self-coupling or isolation can be used. Thereby, the lamp and the high-frequency inductor can be separated from each other, and the high-frequency output transformer is a single voltage transformer, which can be adjusted to a required output voltage. This is difficult to achieve with a general electronic ballast and can be used for the use of N lamps, or N or N different types of lamps through this high frequency output transformer.

  The invention of claim 1 comprises a high frequency output transformer, a frequency modulation / power amplification circuit, a high frequency inductor and a capacitor, of which the frequency modulation / power amplification circuit is connected to the primary side of the high frequency output transformer, and the secondary side N sets of high frequency inductors and capacitors are connected, and each high frequency inductor and capacitor are matched to the secondary side due to the difference in lamp voltage and lamp current of each lamp, so that the electronic ballast lights the N sets of lamps. Regardless of whether the lamp voltage and lamp current of each lamp are the same, the primary power amplifier circuit is not affected, and the output transformer adjusts to output the necessary voltage as necessary. And an electronic ballast.

The excellent points of the present invention are as follows.
1. When lighting N sets of lamps with an electronic ballast, even if the lamp voltage and lamp current of each set are the same, it does not affect the power amplifier circuit on the primary side, and an output transformer is necessary. It can be adjusted to output the required voltage, which is an advantage that is difficult to achieve with known common electronic ballasts.
2. The high-frequency inductor and the capacitor form a series resonance in the circuit, and the filament burns with a sufficient current by the capacitor. The high-frequency high voltage generated by the resonance of the high-frequency inductor and the capacitor causes the resistance in the lamp after lighting the lamp. Lower, ensuring normal lamp operation, so that the circuit can be matched to any secondary discharge lamp by a combination of high frequency output transformer, high frequency inductor and capacitor.

  According to a preferred embodiment of the electronic ballast of the present invention shown in FIGS. 1 and 4, the present invention comprises a high frequency output transformer, a frequency modulation / power amplification circuit, a high frequency inductor and a capacitor, and the high frequency output transformer is its primary. A frequency modulation / power amplification circuit is connected to the side, and N sets of high-frequency inductors and capacitors (IC and MOSFET are used) are connected to the secondary side. The high frequency output transformer is the main load, and the vibration frequency is determined by the IC. The high-frequency output transformer only has to consider the matching with the attached lamp, and the load matching may be matched with the characteristics of the lamp voltage and the lamp current of the load lamp. The difference between the electronic ballast of the present invention and a general electronic ballast is that the output power lamp load is one high-frequency output transformer. There is no DC flow, so either self-coupling or isolation can be used. As a result, the lamp and the high frequency inductor can be separated from each other, and the high frequency output transformer is a single voltage transformer, which can be adjusted to the required output voltage. This is difficult to achieve with a general electronic ballast and can be used for the use of N lamps, or N or N different types of lamps through this high frequency output transformer.

  As shown in FIG. 2, after the high frequency inductor L1 and the capacitor C1 are connected in series to generate a lighting voltage by resonance and the lamp is lit, the internal resistance of C1 becomes much larger than the internal resistance of the lamp. The lamp current of the lamp is made stable by the control of L1.

  A feature of the electronic ballast circuit of the present invention is that both the high frequency voltage and current can be adjusted to match the load lamp, and the circuit is designed for a fixed frequency and fixed voltage, and its power amplification circuit The output transistors are connected in series, and both MOSF and bipolar transistors can be used. It is not necessary to select a high withstand voltage transistor to fix the frequency and voltage, and the load can be easily processed and designed. Matched to the quantity of pieces and any power and any kind of secondary discharge light emitter. In addition, the high frequency inductor and the capacitor can be used in a connection method as shown in FIG.

  If a bipolar type is used, as shown in FIG. 3, the difference is that a bipolar transistor is employed in the power amplifier circuit, and therefore Schottky diodes D1 and D2 are always used, otherwise the chip is used. Can generate heat.

  Another difference of the electronic ballast circuit of the present invention from the known constant voltage ballast is that a general constant voltage lighting circuit cannot light the lamp unless the voltage is increased to three times or more of the lamp voltage. The output transformer has a high voltage potential after the lamp is lit, but this is not easy for the output transformer to handle.

  The high frequency inductor and capacitor of the electronic ballast of the present invention form a series resonance in the circuit, and the capacitor causes the filament to burn with sufficient current. The lamp is lit by the high frequency high voltage generated at the time of resonance of the high frequency inductor and the capacitor, and the resistance in the lamp after the lighting is lowered, whereby the current flows through the lamp, and the main function of the high frequency inductor is a high frequency current limiter. This is to ensure that the lamp is lit well. The circuit can be matched to any secondary discharge lamp, such as an HID, HQI lamp, or general fluorescent lamp, simply by a combination of a high frequency output transformer, a high frequency inductor and a capacitor.

It is an electric circuit diagram of the Example of this invention. It is an electric circuit diagram of another Example of this invention. It is an electric circuit diagram of another example of the present invention. It is a block diagram of the Example of this invention. It is an electric circuit diagram of a well-known technique.

Claims (1)

A high-frequency output transformer, a frequency modulation / power amplification circuit, a high-frequency inductor and a capacitor, wherein the frequency modulation / power amplification circuit is connected to the primary side of the high-frequency output transformer, and N sets of high-frequency inductors and capacitors are provided on the secondary side. Are connected to the secondary side due to the difference in lamp voltage and lamp current of each lamp, so that when the electronic ballast lights N sets of lamps, the lamp of each lamp An electronic ballast characterized in that, regardless of whether the voltage and lamp current are the same, the power amplifier circuit on the primary side is not affected, and the output transformer performs adjustment to output a necessary voltage as necessary.

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