JPS6030092A - Starting pulse generator of discharge lamp firing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a starting pulse generator for a discharge lamp lighting device.

[Background technology]

For discharge lamps that require high-voltage pulses for starting, the one shown in FIG. 1 has been proposed as a starting pulse generator that is less affected by power supply voltage fluctuations and eliminates power loss after the pulse stops. In other words, vs is an AC power supply, B is a single-volume ballast, L is a discharge lamp, C1゜C2 is a capacitor (capacitive element), D + D2 #'j is a diode (rectifying candy),
Q is a triac, and T is a trigger circuit. The operation of this circuit is that when the S terminal of the AC power supply VB (Fig. 2 (a)) is positive, the capacitor C is charged in the previous half cycle as shown in Fig. 2 CC). Capacitor C2 is shown in Figure 2 (b
It gets charged like J.

At this time, the charging path for the capacitor C2 is from the AC power supply Vs through the primary winding aa of the ballast B and the diode D2. Here, when the triac Q, which is the switching means, is triggered and turned on at an arbitrary phase (Fig. 2 (d)
), capacitor C□ in a closed circuit with capacitor C, C2 and primary winding a of ballast B.

It is discharged by the voltage of the series circuit of C2. This Narita is stabilizer B
The voltage is boosted and transmitted to the secondary side of the lamp L, and a high voltage pulse is generated at both ends of the lamp L (FIG. 2(e)). In addition, capacitor C is charged via AC power supply VS, liac Q and diode D2, and is inverted as shown in Figure 2 (cJ).Capacitor C2 is connected to primary winding a of ballast B and diode D.
2 is quickly charged back to its original state via the triac Q
is off. On the other hand, when the S2 terminal of the AC power source vs is positive, the charging/discharging relationship of the capacitors C□ and C2 is reversed, but when the triac Q is turned on, the direction of charging of the capacitor C and C2 is as described above. This is the same as in the case, and therefore the directions of the high voltage pulses generated at both ends of the lamp L are the same.

However, as shown in FIG. 3, this starting pulse generator has the disadvantage that the output pulse heights h, h2 and widths W2 vary depending on the positive and negative polarity of the AC power source Vs and each cycle. This means that when the capacitor C□ is photovoltaic and the triac Q is turned on during the positive half cycle when the S□ end of the AC power source Vs is turned on, the capacitor Cl is connected to the capacitor C3 and the ballast B
The AC power source ■8.
Capacitor C□, triac Q and diode D2
This occurs because the voltage applied to the primary winding IYllJa of ballast B decreases because it is charged in the opposite direction in the closed loop of . Also, at this time, as mentioned above, Vs-+C1→Q→D2
The current flowing through the AC power source ■8 is extremely large because the impedance of the AC power source ■8 is ideally 0. As the return noise increases, triac Q and diode D
The peak current value of , becomes large, and the one with large current capacity is used.

I needed to.

[Purpose of the invention]

Therefore, an object of the present invention is to be able to generate stable pulses with little fluctuation, reduce power supply feedback noise,
Another object of the present invention is to provide a starting pulse generator for a discharge lamp lighting device that can reduce the current capacity of a switch means and a rectifying element.

[Disclosure of the invention]

In this invention, Ml and the capacitive element side of the second charging circuit are connected to both ends of the primary winding of an autotransformer to which a secondary voltage is applied to the discharge lamp, and each charging circuit has opposite polarity. A rectifying element is connected in series to a capacitive element, a switching means is connected between the connection points, and an impedance element for reducing cis fluctuation is provided in the charging circuit. It is possible to stabilize the generated pulse by suppressing a decrease in the voltage of the primary winding due to charging during discharging of the one capacitor.

In addition, the impedance element can reduce power supply feedback noise and reduce the current capacity of the element.

FIG. 4 shows a discharge lamp lighting device to which a first embodiment of the present invention is applied. That is, the difference from FIG. 1 is that a resistor R is inserted in series with the diode D2, which is the charging side when the capacitor C is discharged.

This resistor R reversely charges the capacitor C when the S end of the AC power supply Vs is positive, suppresses the voltage applied to the primary winding +lJa of the ballast B from decreasing, and 8
The difference with the voltage applied to the primary winding a of the ballast B when the two terminals are positive can be made small, and the difference in pulse width and voltage value in each positive and negative half cycle can be made small. In addition, the resistor R can reduce power supply feedback noise and further reduce the current capacity of the triac Q and diode D2.

A discharge lamp lighting device to which a second embodiment of the present invention is applied is shown in FIG. This is for each diode D□, D in each charging circuit.
There is also one in which resistors R□ and R2 are inserted in series with 2. As a result, the resistor R2 suppresses the reverse charging current flowing through the capacitor C□, the triac Q, and the diode D2 when a pulse is generated when the S0 terminal of the certain current power source v8 is positive, and the resistor R suppresses the reverse charging current of the AC power source vS. To regulate the oscillating current that flows in the path of Vs-+D1-+C3-pH when the 52 end is positive and thereby to further reduce the difference in fluctuation between the Can be done.

A discharge lamp lighting device to which a third embodiment of the present invention is applied is shown in FIG. This is a saturation type high-pressure discharge lamp LIK applied, and the starting/curse generator construction is the resistor R of the second embodiment.
, R2 is composed of one resistor RP. In the figure, P is a phase control type short tube voltage control circuit, which incorporates a pulse transformer PT2 for triggering the triac Q. Also, while synchronizing with the voltage on the AC power supply side,
By detecting the tube voltage on the rung L side and changing the pulse generation point of the trigger pulse transformer PT according to the fluctuation of the tube voltage using an integrated circuit IC, and changing the phase angle of the triac Q side, It is designed to keep the tube voltage constant at all times, thereby keeping the color temperature of the discharge lamp constant.'r
is a step down transformer, DB, DB2 is a rectifier, D1~D
lo, D8□ are diodes, Zyo~Z5 are Zener diodes, C1~C9, CS, CN are capacitors, Q□~
Q6 is a transistor, R□ to R□6. R8, Ra~R
o, Rg□.

Rg is a resistor, and ZNRl'i is a voltage responsive element.

A discharge lamp lighting device to which a fourth embodiment of the present invention is applied is shown in FIG. In comparison with Fig. 1, this means that by connecting the 81 end of the current power source vs to the intermediate AN including the midpoint of the primary winding a, the inductance DL of the primary winding a is connected to each charging circuit.
It is configured so that DB2 can be inserted. Thereby, the pulses generated in each half cycle can be made equal, and it is possible to prevent the voltage reduction across the capacitor C when pulses are generated as in the conventional case.

In addition, according to the third aspect of the present invention, a single-turn transformer separate from the ballast may be used. In addition, it is preferable that the switching means be limited to a triac, which is configured to turn on at a certain phase angle every half cycle of the AC power supply.

〔Effect of the invention〕

As described above, the starting pulse generator for the discharge lamp lighting device of the present invention can stabilize the generated pulse CDll5 and the voltage value, reduce power supply feedback noise, and reduce the current capacity of the switch means and rectifying element. There is an effect that it can be done.

[Brief explanation of drawings]

The first figure is the circuit diagram of the conventional example, the second figure is the waveform diagram of each part,
Fig. 3 is a detailed waveform diagram of the generated I pulse, Fig. 4 is a discharge lamp lighting circuit diagram to which the first embodiment of the present invention is applied, and Fig. 5 is a discharge lamp lighting circuit to which the second embodiment is applied. Figure 6 is a discharge lamp lighting circuit diagram to which the third embodiment is applied, and the seventh quotient is the fourth quotient.
FIG. 2 is a discharge lamp lighting circuit diagram to which the embodiment is applied. B... Ballast (single-turn transformer), a... Primary winding, C, C2... Capacitor (capacitive element), D, D2...
Diode (rectifier, L, L, discharge lamp, v8...
AC power supply, Q...triac (switch means), R
1R1, R2, RP...Resistance (impedance element)
, DL Eng. DB2...Inductance (impedance element), N
...Midway point Wl Figure 3 Figure 4 Figure 5 - Each person 111 Figure 7 Procedural Order Fu Seisho - (llj Issued on July 24, 1983 Patent Application No. 140033 No. 2 , Name of the invention Starting pulse generator for discharge lamp lighting device 36 Person making the amendment Relationship with Hanyu Applicant 4, Agent 5, Date of amendment order 1 ゛Voluntary amendment 6, Subject of amendment

Claims (1)

[Scope of Claims] (υ A pair of circuits in which a capacitive element and a rectifying element are connected in series, and the rectifying elements are connected in opposite polarities to each other. an autotransformer in which the capacitive element sides of the first and second charging circuits are connected to both ends of the primary winding, and the secondary voltage of the secondary winding is applied to the discharge lamp; a switch means connected between the connection points of the capacitive elements of the first and second charging circuits and the rectifying confectionery and conductive in the discharge direction of the capacitive elements at a certain phase angle in each half cycle of the AC power source; a starting pulse generator for a discharge lamp lighting device, wherein each of the charging circuits is charged by the alternating current power supply. Claim No. 0, which is a resistor connected in series to the rectifying element of the charging circuit.
A starting pulse generator for a discharge lamp lighting device as described in 2. (3) The impedance element is an inductance inserted into each charging circuit by connecting one end of the AC power source to the intermediate point of the primary winding. Starting pulse generator for discharge lamp lighting equipment.