TW529321B - Discharge lamp lighting device - Google Patents

Abstract

A discharge lamp lighting device comprises: a self-excited inverter for applying pulsed currents to gates of a pair of switching elements Q1 and Q2 via secondary windings T1 of inductors, to switch the pair of switching elements Q1 and Q2 on and off alternately; and a series circuit of a resistor R3 and a switch SW connected between the gate of either of the pair of switching elements Q1 and Q2 and the source for varying the gate voltage.

Description

529321

Laming Technical Field The present invention relates to a discharge lamp lighting device for a self-excited inverter, and the eighth series relates to a discharge lamp lighting device for dimming with a simple circuit. In particular, the conventional self-excited half-bridge-type inverter discharge lamp lighting device has a lower circuit cost than other external-excitation half-bridge methods, but the simple control method is not established. And switching elements, etc., are large, and continuous dimming, etc. are controlled by a simple circuit. Figure 9 is a circuit diagram of a conventional fluorescent lamp lighting device disclosed in, for example, Japanese Unexamined Patent Publication No. 8-1 1 1 293 (conventional example 1). Fig. 9 is a self-excited inverter circuit in which two switching circuits Qj and Q2 are mutually conductive and non-conducting, through the pulse current applied to the base of each switching circuit of the vibrating transformer R field, and the two switching circuits are switched on and off. In the optical function, an inductor coil LV is inserted in parallel with the drive winding W2 of one of the oscillating transformer and τκ, and includes a control coil LC that is coupled to the inductor coil lv to control the inductance value and is variable. On the auxiliary DC power supply of DC control current 1 c, two diodes, D1, D2 and smoothing capacitor C1 are connected in parallel between the grounded transistor and the ground of the power supply e, and it includes current control in series with the control line alone LC. The variable resistor vr is used to adjust the current value of ic by using the variable resistor VR. By changing the L value of the secondary winding and changing the frequency, the light is continuously dimmed. Fig. 10 is a circuit diagram of a conventional daylight lamp lighting device disclosed in Japanese Patent Application Laid-Open No. 4-2 8 6 8 9 8 (known example 2). Figure 1 〇 Series 2 switching transistors 19 and 20 are self-excited inverters that are conductive and non-conductive.

2148-4140-PF; Ahddub.ptd 529321 V. Description of the invention (2) The circuit 29 makes the resistance 23 on the switching side short and changes the amount of light that saturates the inverter. As mentioned above, the present invention is a lamp lighting device, which can be modeled when the electric lamp is started. The element 24 is opened and closed, and an emitter circuit of one switching transistor 20 is opened or closed. As a result, the voltage and point of the current feedback transformer 25 can be adjusted to become the load of the inverter by modifying the operating ratio of the switching transistor 20 or as a frequency. [A fluorescent lamp lighting device of the eighth known example 1] There is a problem that the number of parts is not simple. The fluorescent lamp lighting device of the second known example has a large amount of heat due to the opening and closing of the electric power section, and cannot be constructed with cheap parts. Moreover, the frequency cannot be changed subtly by changing the frequency, and there are also small problems. The purpose of solving the above-mentioned problems is to provide a simple circuit structure for discharging, using cheap parts, sufficient preheating during discharge, dimmable in sections, and an overview of small inventions. : Self-excited inverter, the pair of switching elements through the primary winding of the electric a to make the-pair of switching elements interactive conduction, non-conduction: and: a pulse voltage 'connection circuit, connected to the-pair of switching elements A 2 of the resistance = the string of switches =, change the voltage between the poles. The heart, dimming with the heart segment, can miniaturize the device. Thanks to the preheating of the magic charge knife, it can be divided

529321 V. Description of the invention (3) It also includes: The mutual conduction and non-conduction of a pair of switching elements The voltage of the pair of switching elements and the gate. In the discharge lamp, the device is miniaturized. Furthermore, a plurality of discharge lamps LA are used to form a complementary circuit. Due to the self-converter, the secondary, pulse voltage of the inductor causes the pair of switching elements to intersect i: a series circuit of a pole body and a switch, which is connected in y: Between the sources, change the movement = ~, simple circuit structure 'Using the cheap zero-motion guard to full preheating, the dimming can be segmented, and the $ winder can be used instead of the secondary winding of the inductor. The switching element uses two _M0S ~ FET and p, which can be set as a simpler and simpler circuit. ’Brief description of the diagram. Fig. 1 is a structural view showing a discharge lamp lighting display according to an embodiment of the present invention. Fig. 2 (a) to Fig. 2 (c) are waveforms showing the operation of the discharge lamp lighting device. Fig. 3 Resonance curve of the resonance circuit of the discharge lamp lighting device. Figs. 4 (a) to 4 (c) show the present invention. Embodiment of the invention The waveform diagram of the operation of the lamp device. Electric lamp lighting operation of the discharge lamp of Example 1 Fig. 5 is a waveform diagram showing the operation of the present invention. Fig. 6 is a resonance curve diagram of a discharge lamp lighting circuit according to an embodiment of the present invention. Zhen

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Page 6 529321 V. Description of the invention (4) Fig. 7 is a waveform diagram showing the operation of the discharge lamp lighting device according to the second embodiment of the present invention. 8 (a) to 8 (c) are waveform diagrams showing the operation of the discharge lamp lighting device according to the second embodiment of the present invention. Fig. 9 is a structural diagram of a conventional discharge lamp lighting device. FIG. 10 is a structural diagram of a conventional discharge lamp lighting device. Explanation of symbols

Ql, Q2 switching element, DZ1 ~ DZ4 Zener diode, D1 rectifier diode, LA lamp, LISH, C2 coupling capacitor of LISL inductor T1, 0P1, 0P2 amplifier, the best embodiment of the invention. Example 1 Figure 1 It is a structural diagram showing a discharge lamp lighting device using a self-excited half-bridge type inverter according to Embodiment 1 of the present invention, and Figs. 2, 4, and 5 are waveform diagrams illustrating the operation. Fig. 3 is a resonance curve diagram of a resonance circuit. Figure 1 shows the high-frequency power of a self-excited half-bridge inverter to light the bulb. In Figure 1, E is a DC power supply, T1 is an inductor, and Ql and Q2 are secondary windings of inductor T1.

2l48-4140-PF; Ahddub.ptd Page 7 529321 V. Description of the invention (5), the switching element R2 whose voltage of T1A, T1B is the gate signal opening and closing is a gate that restricts the flow to the switching element Q1, 、, 1 ^ WZ The thunder of the night Xi Xue β day. ^ T pi ^;, 4 丨 w π electrical resistance in series with switch sw, 1 series switch control circuit to control switch SW, u resonance capacitor, τι series inductor, C2 Xiyu ', Li C1 series thundercry Γ 1 4 Φ type suppression τ 彳 f series light-on capacitors, using resonant C1 and inductor ^, τΐ to form a resonance circuit. Next, the operation will be described with reference to FIG. 5. Figure 2 and switching control circuit 1 except Yuan Du 01 ... Electric 1 Kd on 'knife gates Q1 and Q2 of the knife and the shape of the connection point of the switching element Q1, Q2 Figure 3 shows the voltage waveform of the mute point. Figure 3 shows the resonance curve of the Qiu camera circuit, and Figure 4 shows the gate voltages of the switching elements Q1, Q2 when the gate of the transistor Q2 is not inserted into the resistor, Guff's addresser _ ^ η Electrical & voltage waveforms at the connection points of leather and switching elements Ql, Q2, Figure 5 shows the division of Figure 2 R 1 i into π > ★ \, liver circle Z and Figure 4 A part of the gate waveform of the switching element Q2 is enlarged and compared. I first 'explained in Fig. 1 according to Fig. 3 and Fig. 3 that the switch is set to non-conducting = this case is the same as the basic circuit of a conventional self-excited semi-lamp lighting device. u I 'first use the DC power supply E, the switching element Q2 becomes conductive, the resonant circuit formed by the current inductor T1 and the starting capacitor C1, and the secondary windings T1A and T1B of the inductor I ^ Tl are returned to the gate of the switching element Q1, The switching element becomes conductive, the switching element Q2 becomes non-conductive, and the current flows from the DC power source E to the resonance circuit. The inductor n is used to feedback to the switching elements Q1 and Q2. The switching element Q1 becomes non-conductive and the switching element becomes conductive. By repeating the same action, it starts to vibrate according to the resonance frequency of the resonance circuit.

529321 V. Description of the invention (6) And the current flowing to the resonance circuit preheats the discharge lamp LA, and the resonance voltage at both ends of ^^ rises, and when the discharge voltage of the discharge lamp LA is reached, the discharge lamp U Start, then light up. In addition, after the discharge is started, the discharge voltage of the discharge lamp LA itself has a constant discharge voltage, but because the inductor has limited the current, the discharge side, the high-side gate of the switching element Q1, dr ^ 1, is switched on. The pole voltage and the low-side gate voltage of Q2 2 Γ \ Π The voltage waveforms at the connection points of the switching elements 91 and 各自 are changed as shown in Figure II. (C), the voltage generated on the secondary side of the inductor T1 Tuning: The threshold voltage of the components Q1-, Q2 determines the resonance frequency. That is to say, the system is n = mmmTD, and the frequency becomes i / n. The dotted line in Figure 2 indicates the threshold voltage. The relationship between the oscillating frequency and the resonance voltage and the discharge lamp LA lamp LA according to: Pre: As shown in Figure 3, at the oscillation frequency fl, the discharge is oscillated; Γ line ㈣, preheat the filament of the discharge lamp LA . After starting and lighting, the discharge lamp will rise to a frequency of f2 when it rises. i Move to the resonance curve of the lighting. f 3 series dimming _Ξ; Do not turn off: Set the condition ‘because the basic action will be turned on 3: Set the action of the case of _ = ^, use the resistor R3 to divide the gate voltage and reduce it. ^ The gate voltage peak of the switching element Q 2 which is turned on when the switching element Q 2 is turned on. ^ The peak value VP2 k is lower than the peak voltage Vpl of the open-ended closed-pole electric star, which is 2148-4140-PF; Ahddub .ptd Page 9 529321 V. Explanation of the invention (7) The voltage waveforms of the gates of Q1 and Q2 and the voltage waveforms of the connection points of the switching elements Q1 and Q2 become as shown in Figure 4. Due to the voltage division of the resistor R2 connected to the gate of the switching element Q2, as shown in FIG. 4, the time for exceeding the threshold voltage of the switching element Q2 becomes shorter, and the time during which the switching element Q2 is turned on becomes shorter. At this time, one cycle is T2 = T3 + TD + T5 + TD, and the frequency is 1 / T2. Comparing this frequency with the case where the switch SW is not conducting, as shown in FIG. 5, the conducting period T4 of the switching element Q2 becomes shorter than the conducting period T4 of the switching element Q2 in the case where there is no resistor R3. When 'switch sw is not conducting, one cycle is T1 = T3 + TE) + T4 + TI), and when the switch SW is conducting, one cycle is T2 = T3 + TD + T5 + TD. As shown above, because T4 > T5, it becomes Ti > T2, the time of one cycle when the switch SW is on becomes shorter than when the switch sw is not on. Therefore, the frequency becomes 1 / T2 > 1 / T1, and the frequency when the switch sw is turned on becomes higher than when the switch SW is not turned on. On the other hand, "the smaller the value of the resistor R3, the lower the peak voltage Vp2 of the gate voltage of the switching element Q2," and the shorter the conduction period T5 of the switching element Q2 can increase the frequency. Therefore, when the discharge lamp LA is warmed up, the switch sw is turned on to increase the frequency. After the filament of the discharge lamp LA is properly warmed up, the switch ㈣ is turned off and the frequency becomes low, as shown in FIG. 3, The resonance voltage increases and the discharge lamp is started at a frequency f 1. When the switch SW is turned on during lighting, as shown in FIG. 6, the frequency is increased, the resonance voltage is decreased, and the segmented dimming is performed. As shown above, with a simple circuit structure and using cheap parts,

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529321

Since small parts can be used, the device can be fully preheated and dimmed in sections. The second embodiment is replaced with a zener diode in one example. r province = real ... Figure 2

SW DZ is the gate of switching element Q2 and a zener diode connected in series. The operation between the source of the power supply E and the switch will be described with reference to FIG. 8. When the current flows to the Zener diode ..., the strength of the resonance circuit composed of inductor T1 and capacitor ^ becomes lower, and the gate voltage on the secondary side of inductor T1 becomes lower. As shown in FIG. 8, the switching element The turn-on time (T6) of Q2 becomes shorter, and the frequency shifts to the high side. Therefore, the same pre-heating and dimming of the switch SW can be used as the conduction and non-conduction of the switch SW. As shown above, with a simple circuit structure, cheaper parts can be used for sufficient warm-up and segmented dimming. Since small parts can be used, the device can be miniaturized. In addition, the first and second embodiments shown above use the secondary winding of the inductor τ1, but it is also possible to use a current transformer instead of the secondary winding of the inductor T1. In the first and second embodiments, the resistor R 3 or the zener diode d 2 is connected to the switching element Q 2, but it may be connected to the gate of the switching element Q 1. In addition, an N-type MOS-FET is used for the switching element Q1,

529321 V. Description of the invention (9) Q2 uses a complementary circuit of P-type MOS-FET, which makes the circuit simpler and easier. can. In addition, AC-AD conversion power is also available. In addition, DC power supply E is a commercial AC power supply and a smooth one. It ’s also using an active filter ’s or + wave flat ⑴-AD conversion power supply ΰτ // theft booster circuit also

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Claims (1)

529321 6. Scope of patent application 1 · A discharge lamp lighting device, which is characterized by comprising: a self-excited frequency converter, applying a pulse voltage to the open poles of a pair of switching elements via the secondary winding of an inductor to make the pair switch The components are turned on and off in series; and a series circuit of a resistor and a switch is connected between the gate and the source of one of the pair of switching elements to change the voltage of the gate. 2 · A discharge lamp lighting device, comprising a wide self-excited inverter, applying a pulse voltage to the gates of a pair of switching elements via the secondary winding of the inductor, so that the pair of switching elements are turned on and off alternately. And a series circuit of a zener diode and a switch connected between the gate and the source of one of the pair of switching elements to change the voltage of the gate. 3. For the discharge lamp lighting device according to item 1 or 2 of the scope of patent application, in which 'a current transformer is used instead of the ping-pong button of my inductor. 4. If the discharge lamp lighting device according to item 1 or 2 of the patent application scope, wherein a pair of switching elements use N-type MOS-FET and P-type MOS-FET, they constitute a complementary circuit. 5. The discharge lamp lighting device according to item 3 of the scope of patent application, wherein N-type MOS-FET and P-type MOS-FET are used for the switching element to form a complementary electric circuit.