CN104378880A - Fluorescent lamp dimming circuit and control method thereof - Google Patents
Fluorescent lamp dimming circuit and control method thereof Download PDFInfo
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- CN104378880A CN104378880A CN201410610699.3A CN201410610699A CN104378880A CN 104378880 A CN104378880 A CN 104378880A CN 201410610699 A CN201410610699 A CN 201410610699A CN 104378880 A CN104378880 A CN 104378880A
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Abstract
The invention discloses a fluorescent lamp dimming circuit which comprises a main circuit, an auxiliary power module, a single-chip microcomputer control module and a driving module. An input power source Vac is connected with the input of the auxiliary power module, and the output of the auxiliary power module is connected with the power input end of the single-chip microcomputer control module and the power input end of the driving module. The single-chip microcomputer control module obtains the input voltage, sampled by a first voltage transducer, of the main circuit, the voltage, sampled by a second voltage transducer, of the two ends of a first capacitor C1 and the voltage, sampled by a third voltage transducer, of the two ends of a fluorescent lamp. The control signal output by the single-chip microcomputer control module is connected with the driving signal end of the driving module, and the output of the driving module is connected with a gate electrode of a switching tube in the main circuit. The fluorescent lamp dimming circuit can be used for adjusting the brightness of the fluorescent lamp and can lower the brightness of the fluorescent lamp under the low power condition so that the fluorescent lamp cannot be turned off.
Description
Technical field
The present invention relates to fluorescent lamp light regulating technology, be applied to different manufacturers, a kind of fluorescent lamp light adjusting circuit of brightness regulation of fluorescent lamp of dissimilar various model and control method thereof.
Background technology
Illumination plays vital effect in the middle of minimizing energy ezpenditure and greenhouse gas emission, new lighting apparatus can be utilized if LED is to improve illumination efficiency, but, by effectively reducing the consumption (as adjusted by fluorescent lamp very dark when some occasions are by no one, have when people lighten the energy consumption that fluorescent lamp reduces fluorescent lamp) of electric energy, traditional fluorescent lamp in energy-conservation still highly significant.
These fluorescent lamps of picture fluorescent lamp, mercury lamp and sodium vapor lamp are much higher relative to incandescent lamp efficiency, control these fluorescent lamps and are faced with some stern challenges.These electric lights of picture fluorescent lamp, often open once, its life-span approximately reduces one hour, so can not turn on and off continually.And current a lot of electric ballast such as Buck converter is all regulate fluorescent lamp brightness by opening shutoff fluorescent lamp fast continually, greatly reduce the life-span of fluorescent lamp, this is also the electric ballast reason that extensive use is not got up in adjustment fluorescent lamp field.
Summary of the invention
In view of above background, in order to overcome existing deficiency, providing a kind of fluorescent lamp light adjusting circuit and control method thereof, not only solving electron rectifier and frequently cut-offfing the problem that fluorescent lamp reduces fluorescent lifetime, and the energy that itself consumes is also very low, thus reach energy-conservation object.
In order to achieve the above object, the technical scheme that the present invention takes is:
A kind of fluorescent lamp light adjusting circuit, it comprises main circuit, auxiliary power module, single chip control module, driver module.The AC+ of input power Vac connects the input of auxiliary power module, AC-ground connection.The output Vcc of auxiliary power module is connected with the power input Vcc of single chip control module and driver module respectively.The sampled voltage of single chip control module input is from the first voltage sensor, the second voltage sensor, tertiary voltage transducer in main circuit.The input of the control signal termination driver module that single chip control module exports, and the drive singal that driver module exports connects the gate pole of the switching tube in main circuit.
In above-mentioned fluorescent lamp light adjusting circuit, main circuit is connected between fluorescent lamp and input power, and main circuit comprises switching tube, the first diode, rectifier bridge, the first electric capacity, fluorescent lamp, the first voltage sensor, the second voltage sensor and tertiary voltage transducer; Switching tube, the first diode, rectifier bridge, the first Capacitance parallel connection connect, wherein the positive pole of the first electric capacity connects the drain electrode of the first switching tube, the negative pole of the first electric capacity connects the source electrode of the first switching tube, and the negative electrode of rectifier bridge connects the drain electrode of the first switching tube, and the anode of rectifier bridge connects the source electrode of the first switching tube; The input of the first voltage sensor and power input parallel connection, the input of the second voltage sensor and the first Capacitance parallel connection, the input of tertiary voltage transducer and fluorescent lamp parallel connection, the output of the first voltage sensor, the second voltage sensor and tertiary voltage transducer connects the voltage sample end of single chip control module; Daylight lamp string is associated in main circuit, and an end is connected on power supply AC-and holds, and the other end is connected on the negative pole of the first electric capacity.
In above-mentioned fluorescent lamp light adjusting circuit, auxiliary power module comprises rectifier bridge Bridge, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first resistance, the second resistance, the 5th diode.For exporting the first voltage stabilizing chip TL783 of 15V direct voltage and the second voltage stabilizing chip 7805 for exporting 5V direct voltage.The upper and lower two ends of rectifier bridge Bridge connect AC+ and the AC-two ends of input power Vac respectively, export two ends and connect with the second electric capacity two ends respectively.The positive pole termination first voltage stabilizing chip input Vin1 of the second electric capacity, the first voltage stabilizing chip output Vout1 meets the second voltage stabilizing chip input Vin2, and the second voltage stabilizing chip output Vout2 is connected with the input Vcc of one-chip computer module and driver module.The earth terminal of the first voltage stabilizing chip is connected with second resistance one end, the other end ground connection of the second resistance.One end of first resistance is connected with the ungrounded end of the second resistance, another termination first voltage stabilizing chip output Vout1.3rd capacitance cathode termination second voltage stabilizing chip input Vin2, other end ground connection.The output of the 4th capacitance cathode termination second voltage stabilizing chip, other end ground connection.The positive termination second voltage stabilizing chip output Vout2 of the 5th diode, another termination second voltage stabilizing chip input Vin2.
In above-mentioned fluorescent lamp light adjusting circuit, driver module comprises the 3rd resistance, the 5th electric capacity, first and door and driving isolation circuit; The control signal that single chip control module exports connects one end and first and door of the 3rd resistance R3 respectively; Another termination first of 3rd resistance R3 and one end of door and one end of the 5th electric capacity, the other end ground connection of the 5th electric capacity; First connects driving isolation circuit with the output of door.
In above-mentioned fluorescent lamp light adjusting circuit, each driving isolation circuit comprises the 3rd triode, the 4th triode, the 7th electric capacity, the first transformer, the 5th resistance; Be connected after the base stage of the 3rd triode is connected with the base stage of the 4th triode first with the output of door; Be connected with one end of the 7th electric capacity after the emitter of the 3rd triode is connected with the emitter of the 4th triode, the collector electrode of the 3rd triode connects the output of the first voltage stabilizing chip in auxiliary power module, ground connection after the collector electrode of the 4th triode is connected with an input of the first transformer, another input of another termination first transformer of the 7th electric capacity; An output of the first transformer is connected with one end of the 5th resistance, the source electrode of another termination main circuit switch pipe, the gate pole of another termination main circuit switch pipe of the 3rd resistance.
The control method of fluorescent lamp light adjusting circuit: by voltage divider principle, changes the capacitance at the first electric capacity two ends, thus changes the partial pressure value at the first electric capacity two ends, also just changes the voltage at fluorescent lamp two ends.Single chip machine controlling circuit in single chip control module receives main circuit and to sample the input supply voltage, both end voltage and the fluorescent lamp both end voltage that obtain, according to fluorescent lamp brightness regulation needs, the start pulse signal of single chip control module output is decided by the volt-ampere characteristic of fluorescent lamp and the conducting graph of a relation of two switching tubes, the break-make controlling two switching tubes with this changes the length of the first electric capacity place in circuit time, and equivalence changes the size of capacitance.
Compared with prior art, tool of the present invention has the following advantages and technique effect: the present invention not only solves electric ballast and frequently cut-offs the problem that fluorescent lamp makes fluorescent lifetime reduce, and the energy that itself consumes is very low, thus reaches energy-conservation object.Single chip control module receives the signal of the first voltage sensor, the second voltage sensor, tertiary voltage transducer, the moment of shutoff opened by selector switch pipe, thus change the first electric capacity place in circuit time length, equivalence changes the size of its capacitance, the voltage of change fluorescent lamp both sides, thus change the brightness of fluorescent lamp.The wide ranges that this fluorescent lamp regulating circuit regulates, can regulate fluorescent lamp to make it reach very dark degree and be unlikely to fluorescent lamp is turned off, thus the life-span of extended day light modulation.
In addition, compare the doube bridge arm of four switching tubes and single brachium pontis of 2 switching tubes, although its control range is much little, its control circuit is simple, and switching loss also reduces greatly, in less load system or can extensive use.
Accompanying drawing explanation
Fig. 1 is overall construction drawing of the present invention;
Fig. 2 is the circuit diagram of auxiliary power module of the present invention;
Fig. 3 is the circuit diagram of driver module of the present invention;
Fig. 4 is the driving isolation circuit diagram in driver module of the present invention.
Fig. 5 is the circuit diagram of light adjusting circuit of the present invention when being operated in capacitor charging pattern.
Fig. 6 is the circuit diagram of light adjusting circuit of the present invention when being operated in capacitor discharge pattern.
Fig. 7 is the circuit diagram of light adjusting circuit of the present invention when being operated in capacitive bypass pattern.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further; but enforcement of the present invention and protection range are not limited thereto; if there is the not special content described in detail it is noted that following, be all that those skilled in the art can with reference to existing techniques in realizing.
Fig. 1 gives the overall construction drawing of the fluorescent lamp light adjusting circuit of example of the present invention, comprising main circuit, and auxiliary power module, single chip control module, driver module.Main circuit comprises switching tube Q1, the first diode D1, rectifier bridge, the first electric capacity C1, fluorescent lamp, the first voltage sensor, the second voltage sensor and tertiary voltage transducer; Switching tube Q1, the first diode D1, rectifier bridge, the first electric capacity C1 are connected in parallel, wherein the positive pole of the first electric capacity connects the drain electrode of the first switching tube, the negative pole of the first electric capacity connects the source electrode of the first switching tube, the negative electrode of rectifier bridge connects the drain electrode of the first switching tube, and the anode of rectifier bridge connects the source electrode of the first switching tube; The input of the first voltage sensor and power input parallel connection, the input of the second voltage sensor and the first Capacitance parallel connection, the input of tertiary voltage transducer and fluorescent lamp parallel connection, the output of the first voltage sensor, the second voltage sensor and tertiary voltage transducer connects the voltage sample end of single chip control module.Daylight lamp string is associated in main circuit, and the alternating voltage of 220V is converted into the direct voltage output of 15V and 5V by auxiliary power module, as the accessory power supply of single chip control module and driver module.Three voltage sensor sampled voltage signals input to single chip control module, and single chip control module exports control signal to driver module.The drive singal that driver module exports drives the switching tube in main circuit, by turn-on instant and the ON time length of by-pass cock pipe, control the length of the first electric capacity place in circuit time, equivalence changes capacitance size, thus change fluorescent lamp both sides voltage, regulate the brightness of fluorescent lamp.
Fig. 2 gives the circuit diagram of fluorescent lamp light adjusting circuit auxiliary power module, and auxiliary power module comprises rectifier bridge Bridge, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the first resistance R1, the second resistance R2, the 5th diode.For exporting the first voltage stabilizing chip TL783 of 15V direct voltage and the second voltage stabilizing chip 7805 for exporting 5V direct voltage.The upper and lower two ends of rectifier bridge Bridge connect AC+ and the AC-two ends of input power Vac respectively, export two ends and connect with the second electric capacity two ends respectively.The Vin1 end of the positive pole termination first voltage stabilizing chip of the second electric capacity, the first voltage stabilizing chip output Vout1 meets the second voltage stabilizing chip input Vin2, and the second voltage stabilizing chip output Vout2 is connected with the input Vcc of one-chip computer module and driver module.The earth terminal of the first voltage stabilizing chip is connected with second resistance one end, the other end ground connection of the second resistance.One end of first resistance is connected with the ungrounded end of the second resistance, the output of another termination first voltage stabilizing chip.The input of the 3rd electric capacity C3 positive pole termination second voltage stabilizing chip, other end ground connection.The output of the 4th capacitance cathode termination second voltage stabilizing chip, other end ground connection.The output end vo ut2 of the positive termination second voltage stabilizing chip of the 5th diode, the input Vin2 of another termination second voltage stabilizing chip.The ac voltage rectifier of 220V is become direct voltage by rectifier bridge, second electric capacity C2 is filter capacitor, the resistance of the first resistance and the second resistance regulates the size of TL783 output voltage, and the 3rd electric capacity C3 is the output filter capacitor of the first voltage stabilizing chip TL783 and the input filter capacitor of the second voltage stabilizing chip 7805.4th electric capacity C4 is the output filter capacitor of the second voltage stabilizing chip.5th diode protection voltage stabilizing chip 7805, provides a discharge loop.TL783 and 7805 exports the direct voltage of 15V and 5V respectively, as the power supply of each control circuit of internal system.
Fig. 3 is the circuit diagram of driver module, and driver module comprises the 3rd resistance R3, the 5th electric capacity C5, first and door U1 and driving isolation circuit; The control signal that single chip control module exports connects one end and first and one end of door of the 3rd resistance respectively; Another termination first of 3rd resistance and the other end of door and one end of the 5th electric capacity, the other end ground connection of the 5th electric capacity; First connects driving isolation circuit with the output of door.
Fig. 4 is the circuit diagram of driving isolation in driver module, and each driving isolation circuit comprises the 3rd triode Q3, the 4th triode Q4, the 7th electric capacity C7, the first transformer T1, the 5th resistance R5; Be connected after the base stage of the 3rd triode Q3 is connected with the base stage of the 4th triode Q4 first with the output of door; Be connected with one end of the 7th electric capacity after the emitter of the 3rd triode Q3 is connected with the emitter of the 4th triode Q4, the collector electrode of the 3rd triode Q3 connects the output of the first voltage stabilizing chip in auxiliary power module, ground connection after the collector electrode of the 4th triode is connected with an input of the first transformer, another input of another termination first transformer of the 7th electric capacity; An output of the first transformer is connected with one end of the 5th resistance, the source electrode of another termination main circuit switch pipe, the gate pole of another termination main circuit switch pipe of the 3rd resistance.
Fig. 5 is the circuit diagram of fluorescent lamp light adjusting circuit when being operated in charge mode, and figure acceptance of the bid shows circulation path and the direction of electric current I shunt in main circuit under charge mode.During charge mode, the switching tube Q1 in main circuit turns off, so electric current flows through electric capacity C1, power supply charges to electric capacity.
Fig. 6 is the circuit diagram of fluorescent lamp light adjusting circuit when being operated in discharge mode, and figure acceptance of the bid shows circulation path and the direction of electric current I shunt under the first capacitor discharge pattern.During charge mode, the switching tube Q1 in main circuit turns off, now the outside circuit discharging of electric capacity.
Fig. 7 is the circuit diagram of fluorescent lamp light adjusting circuit when being operated in bypass mode, and figure acceptance of the bid shows circulation path and the direction of main circuit current Iswitch under charge mode.During bypass mode, the switching tube Q1 conducting in main circuit, diode reverse biased.Electric current directly flows through switching tube, and diode is bypassed.
As above can realize the present invention preferably and obtain the effect described in summary of the invention.
Claims (6)
1. a fluorescent lamp light adjusting circuit, is characterized in that comprising main circuit, auxiliary power module, single chip control module and driver module; The input of one termination auxiliary power module of input power (Vac), other end ground connection; The output (Vcc) of auxiliary power module is connected with the power input of single chip control module and driver module respectively; The input sample voltage of single chip control module is from the first voltage sensor, the second voltage sensor and tertiary voltage transducer in main circuit; The input of the output control signal termination driver module of single chip control module, and the drive singal that driver module exports connects the switching tube gate pole in main circuit.
2. fluorescent lamp light adjusting circuit according to claim 1, is characterized in that main circuit comprises switching tube, the first diode, rectifier bridge, the first electric capacity, fluorescent lamp, the first voltage sensor, the second voltage sensor and tertiary voltage transducer; Switching tube, the first diode, rectifier bridge, the first electric capacity connection connect, wherein the positive pole of the first electric capacity connects the drain electrode of switching tube, the negative pole of the first electric capacity connects the source electrode of the first switching tube, and the negative electrode of rectifier bridge connects the drain electrode of the first switching tube, and the anode of rectifier bridge connects the source electrode of the first switching tube; Two inputs of the first voltage sensor and power output end parallel connection, wherein one end of the first voltage sensor is also connected with the positive pole of the first electric capacity, the other end of the first voltage sensor is also connected with one end of fluorescent lamp, two inputs of the second voltage sensor and the first Capacitance parallel connection, two inputs of tertiary voltage transducer and fluorescent lamp parallel connection, the output of the first voltage sensor, the second voltage sensor and tertiary voltage transducer connects the voltage sample end of single chip control module; Daylight lamp string is associated in main circuit, and an end is connected on power supply AC-and holds, and the other end is connected on the negative pole of the first electric capacity.
3. fluorescent lamp light adjusting circuit according to claim 1, is characterized in that auxiliary power module comprises rectifier bridge Bridge, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first resistance, the second resistance and the 5th diode, for exporting the first voltage stabilizing chip TL783 of 15V direct voltage and the second voltage stabilizing chip 7805 for exporting 5V direct voltage; The upper and lower two ends of rectifier bridge Bridge connect the two ends of input power (Vac) respectively, export two ends and connect with the second electric capacity two ends respectively; The input (Vin1) of the positive pole termination first voltage stabilizing chip of the second electric capacity, the output (Vout1) of the first voltage stabilizing chip connects the input (Vin2) of the second voltage stabilizing chip, and the output (Vout2) of the second voltage stabilizing chip is connected with the input of one-chip computer module and driver module; The earth terminal of the first voltage stabilizing chip is connected with second resistance one end, the other end ground connection of the second resistance; One end of first resistance is connected with the ungrounded end of the second resistance, the output (Vout1) of another termination first voltage stabilizing chip; The input (Vin2) of the 3rd capacitance cathode termination second voltage stabilizing chip, other end ground connection; The output of the 4th capacitance cathode termination second voltage stabilizing chip, other end ground connection; The output (Vout2) of the positive termination second voltage stabilizing chip of the 5th diode, the input (Vin2) of another termination second voltage stabilizing chip.
4. fluorescent lamp light adjusting circuit according to claim 1, is characterized in that driver module comprises the 3rd resistance, the 5th electric capacity, first and door and driving isolation circuit; The control signal that single chip control module exports connects one end and first and door of the 3rd resistance respectively; Another termination first of 3rd resistance and one end of door and one end of the 5th electric capacity, the other end ground connection of the 5th electric capacity; First connects driving isolation circuit with the output of door.
5. fluorescent lamp light adjusting circuit according to claim 1, is characterized in that driving isolation circuit comprises the 3rd triode, the 4th triode, the 7th electric capacity, the first transformer, the 5th resistance; Be connected after the base stage of the 3rd triode is connected with the base stage of the 4th triode first with the output of door; Be connected with one end of the 7th electric capacity after the emitter of the 3rd triode is connected with the emitter of the 4th triode, the collector electrode of the 3rd triode connects the output of the first voltage stabilizing chip in auxiliary power module, ground connection after the collector electrode of the 4th triode is connected with an input of the first transformer, another input of another termination first transformer of the 7th electric capacity; An output of the first transformer is connected with one end of the 5th resistance, the source electrode of another termination main circuit switch pipe, the gate pole of another termination main circuit switch pipe of the 3rd resistance.
6. the control method of fluorescent lamp light adjusting circuit described in any one of claim 1 ~ 5, it is characterized in that: by the switching frequency of control switch pipe, equivalence changes the capacitance at the first electric capacity two ends, by voltage divider principle, change the partial pressure value at the first electric capacity two ends, also just change the voltage at fluorescent lamp two ends simultaneously; Single-chip microcomputer in single chip control module receives main circuit and to sample the input supply voltage, the first electric capacity both end voltage and the fluorescent lamp both end voltage that obtain, according to fluorescent lamp brightness regulation needs, the start pulse signal for control switch pipe of single chip control module output is decided by the volt-ampere characteristic of fluorescent lamp, the length of the first electric capacity place in circuit time is changed with the break-make of this control switch pipe, equivalence changes the size of capacitance, and then changes the both end voltage of fluorescent lamp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410610699.3A CN104378880A (en) | 2014-10-31 | 2014-10-31 | Fluorescent lamp dimming circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410610699.3A CN104378880A (en) | 2014-10-31 | 2014-10-31 | Fluorescent lamp dimming circuit and control method thereof |
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| CN104378880A true CN104378880A (en) | 2015-02-25 |
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| CN201410610699.3A Pending CN104378880A (en) | 2014-10-31 | 2014-10-31 | Fluorescent lamp dimming circuit and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108243543A (en) * | 2016-12-27 | 2018-07-03 | 松下知识产权经营株式会社 | Sensor device and lighting system |
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| JP2009218000A (en) * | 2008-03-07 | 2009-09-24 | Omron Corp | Illuminating lamp control apparatus |
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Application publication date: 20150225 |