JPS6053200U - discharge lamp lighting device - Google Patents

Abstract

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

Description

[Brief explanation of the drawing]

Figure 1 is an example of a conventional discharge lamp lighting circuit, Figure 2 is a side view of the configuration of a conventional stabilization method, Figure 3 is a circuit diagram showing an embodiment of the present invention, and Figure 4 is a discharge lamp lighting circuit. FIG. 5, which is a diagram for explaining the output stabilization operation, is a relationship diagram of input voltage versus output power, in which a is a characteristic curve according to the conventional circuit, and b is a characteristic curve according to the present invention. 1, 16. 18...first, second, and third transistors, 2. 14. 15. 17...Resistance, 3,
6゜13... Capacitor, 4... Oscillation transformer, 5
,1 '2.19...Diode, 7...Discharge lamp, 8...DC power supply, 9...DC voltage stabilization unit,
10... Inverter section, 11... Switch. Correction 1982. 7.20 The scope of claims for utility model registration is amended as follows. O Utility Model Registration Claims In order to light up a discharge lamp, a rectifier diode and a capacitor for limiting the filament heating current of the discharge lamp are provided on the secondary side of the oscillation transformer, and a first transistor and the first transistor are provided on the primary side of the oscillation transformer. a resistor for supplying starting current of the first transistor and the first transistor;
In a discharge lamp lighting device each having a base current limiting capacitor of a transistor, in parallel with a DC power supply,
Connect a series connected element of a diode and a capacitor, and
The base of the transistor is connected to the connection point between the diode and the capacitor, and when the second transistor is activated, a charging current from the DC power supply is caused to flow into the capacitor through the resistor and the emitter of the second transistor. The second transistor is activated to supply a starting current to the base of the first transistor through a resistor connected to the collector of the second transistor, and the second transistor is activated while the discharge lamp is lit. becomes non-conductive, and the starting current for continuing the lighting is passed through the starting current supplying resistor of the first transistor, and the emitter of the first transistor and one end of the resistor are connected to the base of the third transistor. The other end of the resistor is connected to the emitter of the third transistor to connect the third transistor to the emitter of the third transistor.
A diode for reverse current blocking is connected between the collector of the transistor and the base of the first transistor, so that when the first transistor is non-conductive, the base and collector of the third transistor and the base of the first transistor are connected. A discharge lamp lighting device characterized in that a current flows through a path of a base current limiting capacitor, thereby stabilizing the lighting output of the discharge lamp against fluctuations in input voltage.

Claims (1)

[Scope of utility model registration request] In order to light the discharge lamp, a rectifying diode and a capacitor for limiting the filament heating current of the discharge lamp are installed on the secondary side of the oscillation transformer, and a first transistor and a starting current supply for the first transistor are installed on the primary side of the oscillation transformer. resistor and the first
In a discharge lamp lighting device each having a base current limiting capacitor of a transistor, in parallel with a DC power supply,
Connect a series connected element of a diode and a capacitor, and
The base of the transistor is connected to the connection point between the diode and the capacitor, and when the second transistor is activated, a charging current from the DC power supply is caused to flow into the capacitor through the resistor and the emitter of the second transistor. The second transistor is activated to supply a starting current (tt=starting current) to the base of the first transistor through a resistor connected to the collector of the second transistor, and during lighting of the discharge lamp, the second transistor is
The transistor becomes non-conductive, and the -tE starting current for the continuation of the lighting is caused to flow through the starting current supplying resistor of the first transistor, and the emitter of the first transistor is connected to the base of the third transistor. and connect one end of the resistor,
The other end of the resistor is connected to the emitter of the third transistor, and a backflow blocking diode is connected between the collector of the third transistor and the base of the first transistor. When the transistor is non-conductive, a current flows through the base and collector of the third transistor and the base current limiting capacitor of the first transistor,
A discharge lamp lighting device characterized by improving conversion efficiency against fluctuations in input voltage.