CN1068927A

CN1068927A - But fluorescent lamp or lighting device that period of change and alternation fluorescent tube are driven by direct current polarity

Info

Publication number: CN1068927A
Application number: CN91105175.9A
Authority: CN
Inventors: 杨泰和
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-07-25
Filing date: 1991-07-25
Publication date: 1993-02-10
Anticipated expiration: 2006-07-25
Also published as: CN1028708C; CN2103230U

Abstract

Be subjected to fluorescent lamp that direct current polarity drives or lighting device so that the illumination functions of high stable to be provided but the invention provides a kind of period of change and alternation lamp, it comprises DC power supply device: in order to produce DC power supply to drive the daylight lamp; Polarity switch: by being constituted, in order to be and just to connect or reversal connection person alternately to switch DC power supply polarity and fluorescent tube both sides according to the instruction of polar signal setting device by electromechanical or solid-state element; Light fixture; Polar signal setting device: be a random number generating apparatus, can form an indefinite high or low signal and set the positive-negative polarity of lamp tube ends to drive polarity switch.

Description

But fluorescent lamp or lighting device that period of change and alternation fluorescent tube are driven by direct current polarity

But the present invention relates to fluorescent lamp or lighting device that a kind of period of change and alternation fluorescent tube are driven by direct current polarity.

Since the fluorescent lamp invention, because it is high efficiency cold light source, have the advantage of energy savings and widely application, two types fluorescent lamp is arranged on market at present approximately, one is the fluorescent lamp that drives fluorescent tube with AC power, one is the fluorescent lamp that drives with DC power supply, and the former has accounted for great majority, uses in family, factory and public place.This mode cheapness, though but its brightness with the AC power waveform pulsation changes the setting that the current limit by inductance device is arranged, but effect is not perfect to the greatest extent, and form merit because of low, heat waste, noise are arranged, though and dc fluorescent lamp has good illumination stability, its one-sided negative electrode loss needs with artificial conversion fluorescent tube direction, quite inconvenience.

But the invention provides a kind of Variable Polarity dc fluorescent lamp or lighting device so that the illumination functions of high stable to be provided, is the brightness cycle pulsation injury eyes that form of power supply and with the fixing shortcoming of the unidirectional consume of DC power supply formation tube cathode with the interchange to replace at present.

But fluorescent lamp or lighting device that period of change of the present invention and alternation fluorescent tube are driven by direct current polarity mainly comprise:

-DC power supply device: in order to producing DC power supply driving fluorescent lamp, this direct current contains direct rectifying and wave-filtering or with the DC power supply behind the high-frequency rectification that promotes frequency;

-polarity switch:, with switching DC power supply polarity the fluorescent tube both sides are in order to instruction and just connect or reversal connection according to the polar signal setting device by being constituted by electromechanical relay or solid-state circuit;

-light fixture: be traditional fluorescent tube or other gas fluorescent tube, tube face, flow restricter, necessary auxiliary actuator and connection lead, lamp housings etc. constitute;

-polar signal setting device: be a random number generating apparatus, can be when sending electricity moment according to power supply moment polarity or according to electric arc noise or itself main pulse (CLOCK) form between the one-period alternation (HICH) or low (LOW) signal to drive the positive-negative polarity of polarity switch setting lamp tube ends for signal, itself the time main pulse can be the exchange polarity power supply kenel of deciding frequency or earlier producing upper frequency with appropriate time for the across-the-line starting fluorescent tube to save starter, then produce than the power supply of the exchange polarity power supply kenel of low frequency as continuous illumination, with regard to permanent, the probability summary that high (HICH) and low (LOW) appears in this device equates.

But Fig. 1 is period of change and alternation fluorescent tube is subjected to the fluorescent lamp of electric direct-current polarity driving or the calcspar of lighting device.

Fig. 2 exports into the dotted state schematic diagram for each square of Fig. 1.

Fig. 3 is Fig. 1, the detailed circuit embodiment of Fig. 2.

Describe the present invention in detail below in conjunction with accompanying drawing.

Fig. 1 is block diagram of the present invention, and 101 is DC power supply device among Fig. 1; 102 is polarity switch; 103 is light fixture; 104 is the polar signal setting device.

Fig. 2 is the relevant import and export schematic diagram of this polar signal setting device, when starting shown in Fig. 2 fluorescent tube to be subjected to electric frequency be 5KHZ, become per 180 seconds after the starting and once be subjected to electric polarity for becoming, above-mentioned starting frequency and be subjected to electricity after alternative frequency be all application examples, and be controlled by polar signal setting device 104; Each one can suitably select the alternation after starting frequency and the starting to be subjected to electricity the cycle to be applicable to different lamps, and suitably modifies it and be subjected to electrical waveform or make the alternation between frequency be gradually attenuating.

Figure 3 shows that one of circuit embodiments according to above-mentioned square principle, its main composition is as follows:

-DC power supply device: for by an ac input end as the decompression capacitor C301 series bridge rectification BR302 of current-limiting impedance, the dc output end of a bridge rectifier BR302 commutation capacitor C303 in parallel is to obtain the high voltage direct current of a low ripple, leading to polarity switch, and then input load light fixture group; And constitute the low pressure power supply controlling by a dropping resistor R301 and voltage stabilizing Zener diode ZD301, and by Zener diode ZD301 two ends provide control power supply to the utmost point sexual intercourse change switches set;

-polar signal configuration switch group: for being main body by a controllable timing IC301 NE555, to produce the square wave of controlling of variable cycle, the main element that when switching on and shutting down, produces as square wave through IC301 NE555, for driving optical coupler OC301, IC301 is except that the peripheral RC element of coupling, mat wherein the RC time constant of resistance R 312 and variable resistor VR311 and capacitor C 311 to select to start the frequency of high frequency, being parallel to capacitor C 311 two ends in the circuit is constituted with variable resistor VR312 by photo resistance CDS311 and adjustment, wherein photo resistance CDS311 and adjustment variable resistor VR312 constitute, wherein photo resistance CDS311 can avoid the external light interference to be coupled in the lamp luminescence element for being arranged at, the resistance of CDS311 descends when light fixture is activated then, because CDS311 shunts with the parallel connection of its VR312 that connects, make former R312, the time constant that VR311 and C311 constituted makes light fixture be the low frequency and continuous operation, make the output cycle rectangular wave of IC301 reduce to low frequency gradually, to control the sending electrode of polarity switch group to load by high frequency; And IC301 recovers holding state because of CDS311 recovers high impedance when shutdown; This polar signal configuration switch group also can be made of with software a microprocessor, controls signal according to formula output frequency conversion;

-polarity switch: for by two groups of NPN power crystal Q301, Q302 and two groups of PNP power transistor Q303, Q304 constitutes a bridge circuit after the series connection respectively mutually, wherein Q301 connects with Q303, Q302 is with after Q304 connects, the emitter of Q301 and Q302 is access to power supply negative terminal, the emitter of Q303 and Q304 is access to power positive end, the light fixture load be parallel to then that Q301 is connected in series a little with the emitter of Q303 and Q302 with between the emitter of Q304 is connected in series a little, bias resistance R311 and current-limiting resistance R317 are for supplying to control Q301, current-limiting resistance R313 is for controlling Q302, R314 is a current-limiting resistance, resistance R 315 and R316 control Q303 and Q304 for being to intersect, so that whole bridge circuit send electricity for making positive reversed polarity to load, this bridge circuit adds controlling of transistor Q305 for accepting, and Q305 then accepts controlling of aforementioned polar signal switch, when Q305 was conducting and open circuit, aforementioned bridge circuit was to the manipulator of load submission change poles.

In the moment of sending into alternating current dc fluorescent lamp is sent into high frequency alternation DC power supply through above-mentioned design and then reduce alternating cycles to continue that fluorescent tube is subjected to the starting fluorescent tube, because the no brightness pulsation of direct current input, the eye of not hurting sb.'s feelings, and owing to have the free signal setting device, in using, long-term accumulated will make the fluorescent tube both sides for just equating for negative probability is rough, and one-sided aging to prevent fluorescent tube; But the device of variable frequency and power supply polarity also can be used as the globality lighting apparatus is done the power supply of Variable Polarity to constitute the illuminator of a variable polarity power, its light fixture group of powering is except pure DC power supply of mat or daylight light fixture group that high frequency pulse dc drove, also suitable other lighting apparatus such as incandescent lamp or mercury vapor lamp or the inflation discharge lamp that contains DC load, the light fixture load of the indefinite polarity power of other applicable direct currents of arc lamp.

Comprehensively above-mentioned, the present invention has disclosed a kind of dc fluorescent lamp or lighting device is subjected to electric polarity to continue to light the lamp device of fluorescent tube with the high frequency period exchange with the starting fluorescent tube and with the cycle exchange fluorescent tube than low frequency, make and eliminated with the light period scintillation of fluorescent lamp that AC power is driven at present, and eliminate the shortcoming of the cloudy loss of the one-sided electricity of traditional direct-flow fluorescent tube simultaneously, and make quality of lighting improve, eye health obtains to ensure, the intention novelty, function is definite, is please examined in accordance with the law and examines to praying.

Claims

1, but but a kind of period of change and alternation fluorescent tube be mainly by fluorescent lamp that direct current polarity drives or lighting device a kind ofly to change fluorescent lamp or other light fixture groups that fluorescent tube drives by electric frequency and direct-current polarity power supply with the cycle and continue to light with the high-frequency starting low frequency, it is characterized in that comprising:

--DC power supply device: in order to producing DC power supply driving light fixture, this direct current contains DC power supply or by the DC power supply of AC power rectifying and wave-filtering or with the DC power supply behind the high-frequency rectification that promotes frequency;

--polarity switch: by being constituted, in order to be and just to connect or reversal connection alternately to switch DC power supply polarity and fluorescent tube both sides according to the instruction of polarity setting device by electromechanical or solid-state element;

--light fixture: be traditional fluorescent tube or other gas fluorescent tubes, tube face, flow restricter, necessary auxiliary actuator and connection lead, lamp housings etc. constitute;

--polar signal setting device: be a random number generating apparatus, can be when sending electricity moment according to power supply moment polarity or according to electric arc noise or itself main pulse be that signal forms an indefinite high or low signal to drive the positive-negative polarity that polarity switch is set at lamp tube ends, itself the time main pulse can be the exchange polarity power supply kenel of deciding frequency or earlier producing upper frequency with appropriate time for the across-the-line starting fluorescent tube to save starter, then produce than the power supply of the exchange polarity power supply type of low frequency as continuous illumination, with regard to permanent, this type of device high or low probability summary occurs and equates;

Above-mentioned primary structure device is formed on sends into alternating current moment, the starting transient signal of the upper frequency that free polar signal setting device produces with the starting fluorescent tube again with the signal handling polarity switch in low cycle with DC power supply cycle alternation input light fixture group, in using, long-term accumulated make the fluorescent tube both sides for just equating for negative probability is rough, preventing that fluorescent tube is one-sided aging, to drive dc fluorescent lamp simultaneously, incandescent lamp, mercury vapor lamp or inflation discharge lamp, the light fixture load of arc lamp and the indefinite polarity power of other applicable direct currents.

2, but period of change as claimed in claim 1 and alternation fluorescent tube are subjected to fluorescent lamp or the lighting device that direct current polarity drives, and it is characterized in that its circuit formation comprises:

-DC power supply device: for by an ac input end as the decompression capacitor C301 series bridge rectification BR302 of current-limiting impedance, the dc output end of a bridge rectifier BR302 commutation capacitor C303 in parallel is to obtain a low high voltage direct current that connects ripple, leading to polarity switch, and then input load light fixture group; And constitute the low pressure power supply controlling by a dropping resistor R301 and voltage stabilizing Zener diode ED301, and by Zener diode ED301 two ends provide control power supply to the utmost point sexual intercourse change switches set;

-polar signal configuration switch group: for being main body by a controllable timing IC301 NE555, to produce the square wave of controlling of variable cycle, the main element that when start, produces as square wave through IC301 NE555, for driving optical coupler OC301, IC301 is except that the peripheral RC element of coupling, mat wherein the RC time constant of resistance R 312 and variable resistor VR311 and capacitor C 311 to select to start the frequency of high frequency, being parallel to capacitor C 311 two ends in the circuit is constituted with variable resistor VR312 by photo resistance CDS311 and adjustment, wherein photo resistance CDS311 can avoid external light to disturb the element that is coupled in lamp luminescence for being arranged at, the resistance of CDS311 descends when light fixture is activated then, because CDS311 shunts with the parallel connection of its VR312 that connects, make former R312, the time constant that VR311 and C311 constituted makes light fixture be the low frequency and continuous operation, make the output cycle rectangular wave of IC301 reduce to low frequency gradually, to control the sending electrode of polarity switch group to load by high frequency; And IC301 recovers holding state because of CDS311 recovers high impedance when shutdown; This polar signal configuration switch group also can be made of with software a microprocessor, according to the formula output frequency conversion person that controls the signal;

-polarity switch: for by two groups of npn power transistor Q301, Q302 and two groups of PNP power transistor Q303, Q304 constitutes a bridge circuit after the series connection respectively mutually, wherein Q301 connects with Q303, the emitter of Q301 and Q302 was access to power supply negative terminal after Q302 connected with Q304, the emitter junction of Q302 and Q304 is toward power positive end, the light fixture load then is parallel to Q301 and connects between the contact with the emitter of Q304 with emitter serial connection and the Q302 of Q303, bias resistance R311 and current-limiting resistance R317 are for supplying to control Q301, current-limiting resistance R313 is for controlling Q302, R314 is a current-limiting resistance, resistance R 315 and R316 control Q303 and Q304 for being to intersect, so that whole bridge circuit send for making positive reversed polarity to load, this bridge circuit is for accepting to add controlling of crystal Q305, Q305 then accepts controlling of aforementioned polar signal switch, and when Q305 was conducting and open circuit, aforementioned bridge circuit was controlled load submission change poles.

3, but period of change as claimed in claim 1 and alternation fluorescent tube are subjected to fluorescent lamp or the lighting device that direct current polarity drives, and it is characterized in that the mode of its high-frequency starting low-frequency cycle polarity exchange comprises by directly transferring low-frequency cycle polarity exchange behind the high-frequency starting to or gradually reducing to the mode that the low-frequency pole sexual intercourse is changed by high frequency.