JPH0664398U - Discharge lamp lighting device - Google Patents

Abstract

(57) [Summary] [Purpose] To extend the life of the discharge lamp and reduce battery consumption.
To reduce the number of parts and simplify the circuit configuration.
And make it small and cheap. [Structure] Inverter powered by commercial power supply AC
Circuit IN₁This inverter circuit IN₁Both outputs of
Discharge lamp DL on the terminal₁Both filaments f₁, F₂of
Connect one end to battery B and power from battery B
Powered inverter circuit IN₂And set this invert
Data circuit IN₂Both output terminals of the discharge lamp DL₁Both sides
Filament f₁, F₂To each end of the
Pump DL₁Both filaments f₁, F₂Between the other end of
Densa C₇And switching element Q_FiveConnect the series circuit of
Continue, switching element Q_FiveThe inverter circuit IN₁，
IN ₂Switch on in response to each startup of
Element Q_FiveThe inverter circuit IN₂After a certain time has passed since the startup of
Turn off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a discharge lamp in which the same fluorescent lamp or the like is selectively supplied with high-frequency power from two power sources, that is, two inverter circuits respectively supplied with a commercial power source and a battery. The present invention relates to a discharge lamp lighting device for lighting a high frequency.

[0002]

[Prior art]

 FIG. 2 is a circuit diagram showing a conventional discharge lamp lighting device of this type. This discharge lamp lighting device, as shown in FIG. 2, uses a commercial power supply AC as a filter capacitor C.₁And a pair of full-wave rectifiers R E via a choke coil LF for filtering.₁Full-wave rectifier RE connected to the AC input end of₁Smoothing capacitor C on the pair of DC output terminals₂, And smoothing capacitor C₂Switching element Q consisting of a bipolar transistor in parallel with₁, Q₂Of the switching element Q by connecting the series circuit of₁, Q ₂ Diode D₁, D₂Are connected in anti-parallel. Switching element Q ₁ , Q₂And diode D₁, D₂Is a serial inverter circuit IN₁The switching element Q₁, Q₂Switching control of the control circuit CR₁It is carried out by.

One end (collector) of the switching element Q ₁ is connected to one end of one filament f ₁ of the discharge lamp DL ₁ via a series circuit of an inductor L ₁ and a capacitor C ₃ , and the other end of the switching element Q ₁ is connected. The (emitter) is connected to one end of the other filament f ₂ of the discharge lamp DL ₁ . Between one end and the other end of the filaments f ₁ and f ₂ of the discharge lamp DL ₁ , a capacitor C ₇ as an impedance element for preheating current conduction, a full-wave rectifier DB ₂ and a switching element Q ₅ composed of a bipolar transistor are provided. The series circuit of is connected. The switching control of the switching element Q ₅ is also performed by the control circuit CR ₁ . The inductor L ₁ , the capacitor C ₃ and the capacitor C _{7 form} a resonance circuit.

Further, the positive electrode of the battery B, such as secondary batteries via the inductor L ₂ is connected to the connection point of the pair of the primary winding of the oscillating transformer T _2, a pair of the primary winding of the oscillating transformer T ₂ A series circuit of switching elements Q ₃ and Q ₄ composed of MOS transistors is connected between both ends of the battery, and the connection point of the switching elements Q ₃ and Q ₄ is connected to the negative electrode of the battery B. Sui switching element Q _3, Q ₄ and the oscillation transformer T ₂ are, constitutes the L- push-pull type inverter circuit IN _2, the switching control of the switching elements Q _1, Q ₂ is performed by the control circuit CR ₂ .

Oscillation transformer T₂Secondary winding n₁Is a capacitor C at one end_FiveThrough the discharge lamp DL₁One filament f₁Of the discharge lamp D L₁The other filament f of₂Is connected to the other end of. Also, the oscillation transformer T ₂ First preheating winding n provided in₂Is the discharge lamp DL₁One filament f₁ Capacitor C between both ends of_FourIs also connected via the second preheating winding n₃Is a discharge lamp DL₁The other filament f of₂Capacitor C between both ends of₆Connected through. Oscillation transformer T above₂And capacitor C_Four~ C₆Constitutes a resonant circuit.

Next, an operation of the discharge lamp lighting device will be described. The discharge lamp lighting device, the discharge electric lamp DL ₁ by feeding causes a high frequency lighting inverter circuit IN ₁ from the commercial power source AC, so that the discharge lamp DL ₁ to feed from the battery B to the inverter circuit IN ₂ are high frequency lighting I have to. In this case, the inverter circuit during the operation of the IN _1, the operation of the inverter circuit IN ₂ stops, during operation of the inverter circuit IN ₂ is the operation of the inverter circuit IN ₁ stops. That is, high-frequency power is selectively supplied from the inverter circuit IN ₁ and the inverter circuit IN ₂ to the discharge lamp DL ₁ , and the discharge lamp DL ₁ is lit at high frequency.

More specifically, when power is supplied from the commercial power supply AC and power supply from the battery B is stopped, the voltage is rectified and smoothed by the full-wave rectifier DB ₁ and the smoothing capacitor C ₁ , A DC voltage is available across smoothing capacitor C ₁ . This DC voltage is applied to the series circuit of both switching elements Q ₁ and Q ₂ of the inverter circuit IN ₁ , and a switching signal is supplied from the control circuit CR ₁ to the switching elements Q ₁ and Q _{2. 1} , Q ₂ are alternately turned on and off at a high frequency to perform a high frequency conversion, and at this time, the switching element Q ₅ is turned on by a signal from the control circuit CR ₁ .

As a result, the output of the inverter circuit IN ₁ is supplied to the discharge lamp DL ₁ via the resonance circuit including the inductor L ₁ and the capacitors C ₃ and C ₇ , and the preceding preheating current is supplied to the discharge lamp DL ₁ . After that, the discharge lamp DL ₁ is started and turned on. On the other hand, when the power supply from the commercial power supply AC is stopped and the power is supplied from the battery B, the DC voltage is applied from the battery B to the inverter circuit IN ₂ , and further from the control circuit CR ₂ to the switching elements Q ₃ and Q ₄ . Since the switching signal is supplied, the switching elements Q ₃ and Q ₄ are alternately turned on and off at high frequency to perform high frequency conversion, and at this time, the switching element Q ₅ is turned off.

As a result, the output of the inverter circuit IN ₂ is supplied to the discharge lamp DL ₁ through the resonance circuit composed of the oscillation transformer T ₂ and the capacitors C _{4 to} C ₆ , and the discharge lamp DL ₁ is always supplied with the preheating current. , The discharge lamp DL ₁ is started and lit. The lighting circuit configuration as described above has been made non-contact in order to avoid the risk that the relay contact may generate an arc and weld due to the use of the relay contact for switching the lamp. It is a thing.

[0010]

[Problems to be solved by the device]

In the conventional example of FIG. 2, the same discharge lamp DL ₁ is selectively lit by supplying high-frequency power from the inverter circuit IN ₁ and the inverter circuit IN ₂ , but commercial power supply AC is supplied. When the discharge lamp DL ₁ is turned on by the commercial power supply AC, there is no problem because the discharge lamp DL ₁ is previously preheated and then turned on. However, when the discharge lamp DL ₁ is lit by the battery B after the commercial power supply AC is cut off, the discharge lamp DL ₁ is always lit while being preheated, so that the cold cathode starts and the life of the discharge lamp DL ₁ becomes longer. There was a problem that was shortened.

Further, when the discharge lamp DL ₁ is turned on by the battery B, unnecessary preheating is continuously performed even after the discharge lamp D L ₁ is turned on, so that there is a problem that the stored energy of the battery B is largely consumed. It was In addition, since preheating is performed using different preheating circuits when the discharge lamp DL ₁ is lit by the commercial power supply AC and when it is lit by the battery B, the number of parts is large and the circuit configuration becomes complicated, There was a problem that it was large and expensive.

An object of the present invention is to provide a discharge lamp lighting device capable of extending the life of the discharge lamp. Another object of the present invention is to provide a discharge lamp lighting device capable of reducing the number of parts, simplifying the circuit structure, and being small in size and inexpensive. Still another object of the present invention is to provide a discharge lamp lighting device capable of reducing battery consumption.

[0013]

[Means for Solving the Problems]

 The discharge lamp lighting device according to claim 1 is provided with a first inverter circuit which is supplied with electric power from a commercial power source, and one ends of both filaments of the discharge lamp are respectively connected to both output terminals of the first inverter circuit. Then, a battery and a second inverter circuit supplied with power from this battery are provided, and both output terminals of this second inverter circuit are connected to one end of both filaments of the discharge lamp, and the other end of both filaments of the discharge lamp is connected. An impedance element for energizing preheating current is connected between them.

A discharge lamp lighting device according to a second aspect is the discharge lamp lighting device according to the first aspect, wherein a switching element is inserted between the other ends of both filaments of the discharge lamp in a state of being in series with the impedance element for energizing the preheating current. The switching element is turned on in response to the activation of each of the first and second inverter circuits, and the switching element is turned off after a certain period of time has elapsed after the activation of the second inverter circuit.

[0015]

[Action]

 According to the configuration of claim 1, a single preheating current is used both when the discharge lamp is lit by the commercial power supply using the first inverter circuit and when it is lit by the battery using the second inverter circuit. Preheating is performed by the preceding preheating method through the impedance element for energization. As a result, the cold cathode starting of the discharge lamp is eliminated and the life of the discharge lamp is extended.

According to the configuration of claim 2, when the second inverter circuit is turned on by the battery, the switching element is turned off after a lapse of a certain time after the activation of the second inverter circuit. There is no unnecessary preheating after the lamp is turned on.

[0017]

【Example】

An embodiment of this invention will be described with reference to FIG. In this discharge lamp lighting device, as shown in FIG. 1, one end of a secondary winding of an oscillating transformer T ₁ (excluding the preheating windings N ₂ and N ₃ from the oscillating transformer T ₁ ) is connected via a capacitor C ₅ . discharge lamp connected to one end rather than at one end of the filament f ₁ of DL ₁ Te, rather than the other end and the other end of the discharge lamp DL ₁ of the other filament f ₂ of the secondary winding of the oscillating transformer T ₁ It is connected to one end, and the constant preheating from the preheating winding of the oscillating transformer T ₁ to the filaments f ₁ and f ₂ of the discharge lamp DL ₁ is stopped. Instead, the switching element Q _{5 is connected} to the inverter IN by the control circuit CR ₂ . ₂ is turned on for a certain period of time immediately after the start-up so that the preheating by the preheating current passing through the capacitor C ₇ is performed. After the elapse of the above-mentioned certain time, the switching element Q ₅ is turned off by the control circuit CR ₂ and the preheating current stops flowing.

Other configurations are similar to those of the conventional example shown in FIG. Here, the operation of this embodiment will be described. The discharge lamp lighting device, the discharge electric lamp DL ₁ by feeding causes a high frequency lighting inverter circuit IN ₁ from the commercial power source AC, so that the discharge lamp DL ₁ to feed from the battery B to the inverter circuit IN ₂ are high frequency lighting I have to. In this case, the inverter circuit during the operation of the IN _1, the operation of the inverter circuit IN ₂ stops, during operation of the inverter circuit IN ₂ is the operation of the inverter circuit IN ₁ stops. That is, high-frequency power is selectively supplied from the inverter circuit IN ₁ and the inverter circuit IN ₂ to the discharge lamp DL ₁ , and the discharge lamp DL ₁ is lit at high frequency.

More specifically, when power is supplied from the commercial power supply AC and power supply from the battery B is stopped, the voltage is rectified and smoothed by the full-wave rectifier DB ₁ and the smoothing capacitor C ₁ , A DC voltage is available across smoothing capacitor C ₁ . This DC voltage is applied to the series circuit of both switching elements Q ₁ and Q ₂ of the inverter circuit IN ₁ , and a switching signal is supplied from the control circuit CR ₁ to the switching elements Q ₁ and Q _{2. 1} , Q ₂ are alternately turned on and off at a high frequency to perform a high frequency conversion, and at this time, the switching element Q ₅ is turned on by a signal from the control circuit CR ₁ .

[0020] As a result, the output of the inverter circuit IN ₁ is supplied to the resonance and the discharge lamp DL ₁ by a resonance circuit, a discharge lamp DL ₁ is preheating current is supplied, the discharge lamp D L ₁ is turned on. On the other hand, when the power supply from the commercial power supply AC is stopped and the power is supplied from the battery B, the DC voltage is applied from the battery B to the inverter circuit IN ₂ , and further from the control circuit CR ₂ to the switching elements Q ₃ and Q ₄ . Since the switching signal is supplied, the switching elements Q ₃ and Q ₄ are alternately turned on and off at high frequency to perform high frequency conversion. Moreover, the switching element Q ₅ is turned on by the control circuit CR _{2 for} a certain period of time immediately after the start-up of the inverter circuit IN ₂ .

As a result, the inverter circuit IN₂Output of oscillation transformer T₁To capacitor C _Five And capacitor C₇Through discharge lamp DL₁Preheat current is applied to the discharge lamp DL₁Pre-heat. After that, the control circuit CR₂Switching element Q_Five When the lamp is turned off, the discharge lamp DL₁Filament f₁, F₂Preheating has stopped, and at the same time the discharge lamp DL₁Starts and lights up. At this time, the discharge lamp DL from the battery B₁The battery B capacity can be effectively utilized by supplying only the power for turning on.

According to the discharge lamp lighting device of this embodiment, even when the discharge lamp DL ₁ is lit by the commercial power supply AC using the inverter circuit IN ₁ , the battery B uses the inverter circuit IN ₂ as well. even when turning on, since the preheated by preheating system through capacitor C ₇ is a single preheating current energizing impedance element, it is possible to eliminate the cold cathode start of the discharge lamp DL _1, the life of the discharge lamp DL ₁ The length can be increased, and the number of parts can be reduced and the circuit configuration can be simplified to be small and inexpensive.

Further, when turning on using an inverter circuit IN ₂ by the battery B is in the turned off after the lapse of the switching element Q ₅ the inverter circuit IN ₂ after starting a predetermined time, the lighting of the discharge lamp DL ₁ It is possible to prevent unnecessary power from being supplied from the battery B to the inverter circuit IN ₂ by eliminating wasteful preheating, and to reduce the consumption of the battery B.

In the above embodiment, when the discharge lamp was lit by the commercial power source using the first inverter circuit, preheating was continued even after the discharge lamp was lit. The preheating may be stopped after a certain period of time. Further, if it is not intended to suppress the consumption of the battery, it is possible to omit the switching element Q ₅ and always connect the capacitor C ₇ between the other ends of the filaments f ₁ and f ₂ of the discharge lamp DL _1. . In this case, it is necessary to set the circuit constant of the inverter IN ₂ so that the discharge lamp DL ₁ can be started and lit even when the capacitor C ₇ is connected.

[0025]

[Effect of device]

 According to the discharge lamp lighting device of claim 1, when the discharge lamp is lit by the commercial power supply using the first inverter circuit, or when the discharge lamp is lit by the battery using the second inverter circuit, the single operation is performed. Since preheating is performed by the preheating method through the single preheating current carrying impedance element, the cold cathode starting of the discharge lamp can be eliminated, the life of the discharge lamp can be extended, the number of parts can be reduced, and the circuit configuration can be reduced. It can be simplified, small, and inexpensive.

According to the second aspect of the present invention, when the second inverter circuit is turned on by the battery, the switching element is turned off after a lapse of a certain time after the activation of the second inverter circuit. It is possible to eliminate unnecessary preheating after the lamp is turned on, reduce battery consumption, and make effective use of battery capacity.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a discharge lamp lighting device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a configuration of a conventional discharge lamp lighting device.

[Explanation of symbols]

AC Commercial power source B Battery IN ₁ Inverter circuit IN ₂ Inverter circuit DL ₁ Discharge lamp C ₇ Capacitor (impedance element for preheat current conduction) Q ₅ Switching element

Claims (2)

[Scope of utility model registration request] 1. A first inverter circuit supplied with power from a commercial power source, a discharge lamp in which one end of both filaments is connected to both output terminals of the first inverter circuit, a battery, and power supplied from this battery. Discharge lamp lighting including a second inverter circuit having both output terminals connected to one ends of both filaments of the discharge lamp, and a preheating current conducting impedance element connected between the other ends of both filaments of the discharge lamp apparatus. 2. A switching element is inserted and connected between the other ends of both filaments of the discharge lamp in series with an impedance element for energizing preheating current, and the switching element responds to the activation of each of the first and second inverter circuits. The discharge lamp lighting device according to claim 1, wherein the switching element is turned on, and the switching element is turned off after a lapse of a predetermined time after the activation of the second inverter circuit.