CN102811527A - LED frequency-variable marker lamp and control circuit and control method of marker lamp - Google Patents

LED frequency-variable marker lamp and control circuit and control method of marker lamp Download PDF

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Publication number
CN102811527A
CN102811527A CN2011101441050A CN201110144105A CN102811527A CN 102811527 A CN102811527 A CN 102811527A CN 2011101441050 A CN2011101441050 A CN 2011101441050A CN 201110144105 A CN201110144105 A CN 201110144105A CN 102811527 A CN102811527 A CN 102811527A
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led
unit
frequency
control circuit
frequency modulation
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CN2011101441050A
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周明杰
黄柯青
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Priority to CN2011101441050A priority Critical patent/CN102811527A/en
Publication of CN102811527A publication Critical patent/CN102811527A/en
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Abstract

The invention relates to an LED frequency-variable marker lamp and a control circuit and a control method of the marker lamp. The control circuit comprises a signal receiving unit, a control unit, a switch driving unit and a power supply unit. The signal receiving unit is used for converting received flicker frequency modulation signals into voltage signals by a rotary frequency-modulation switch; the control unit utilizes a single chip microcomputer to acquire the voltage signals, perform analog to digital conversion, identify corresponding frequency modulation stage numbers of the flicker frequency modulation signals and output PWM(pulse width modulation) signals having the duty ratio and cycle corresponding to the frequency modulation stage numbers; the switch driving unit is used for converting the PWM signals into driving signals to drive an LED light emitting unit to emit light with the corresponding flicker frequency; and the power supply unit is used for supplying power for the other units. Since the frequency modulation stage numbers corresponding to the received flicker frequency modulation signals are identified and the corresponding PWM signals are output, control of the flicker frequency of the LED frequency-variable marker lamp is realized, the flicker frequency with different stage numbers can be adjusted flexibly, and the defect that flicker frequency of the LED marker lamp of the prior art is constant is overcome.

Description

LED Frequency Adjustable sign lamp and control circuit and control method
Technical field
The present invention relates to lighting technical field, more particularly, relate to a kind of LED Frequency Adjustable sign lamp and control circuit and control method.
Background technology
Along with the continuous development of science and technology, the new product new technology is constantly reformed, and LED is as new type light source, and it has energy-saving and environmental protection, characteristics of high efficiency, and ripe and be applied to every field.When LED was widely used as light source, various led drive circuits had also appearred.
Sign light is widely used in security fields, the effect of playing caution and reminding, thus provide safeguard for various job safetys.The sign light that more and more use LED make has appearred at present.Yet existing LED sign lamp generally has fixing flicker frequency, therefore is necessary to develop a kind of LED Frequency Adjustable sign lamp that can regulate flicker frequency flexibly.
Summary of the invention
The technical problem that the present invention will solve is to having sign light now the defective of fixing flicker frequency is arranged, and provides a kind of and can identify lamp and control circuit and control method to the LED Frequency Adjustable that flicker frequency is regulated.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED Frequency Adjustable sign lamp and control circuit and control method; Through adopting the rotation frequency modulation switch to convert the flicker frequency conditioning signal that receives into voltage signal; It is discerned; Export the pwm signal in corresponding duty ratio and cycle, thereby the flicker frequency of the LED that adjustment is driven is consistent with the flicker frequency of expectation.
First aspect present invention provides a kind of LED Frequency Adjustable sign lamp control circuit, comprising: signal receiving unit, convert the flicker frequency conditioning signal that receives into voltage signal through the rotation frequency modulation switch; Control unit, be used to discern the corresponding frequency modulation progression of said flicker frequency conditioning signal, and output have the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle; The switch drive unit, be used for converting said pwm signal into light that drive LED luminescence unit sends corresponding flicker frequency; And power supply unit, be used to said signal receiving unit, control unit, switch drive unit and the power supply of LED luminescence unit.
In the described LED Frequency Adjustable of first aspect present invention preferred embodiment sign lamp control circuit, said control unit comprises: the AD modular converter, be used for said voltage signal is carried out analog-to-digital conversion; The pwm signal output module, be used for output pwm signal; Adjusting module, be used for according to the flicker frequency conditioning signal after the conversion of said AD modular converter; Search the expectation duty ratio and the cycle of corresponding frequency modulation progression, adjust duty ratio and cycle that duty ratio and the cycle of the pwm signal of said pwm signal output module output equal said expectation.
In the described LED Frequency Adjustable sign of first aspect present invention preferred embodiment lamp control circuit; Said signal receiving unit comprises the sampling resistor that rotation frequency modulation switch, divider resistance and a plurality of resistance do not wait; The moved end of said rotation frequency modulation switch is connected to the positive output end of said power supply unit through said divider resistance, and a plurality of not moved ends of said rotation frequency modulation switch are respectively through a said sampling resistor ground connection.
In the described LED Frequency Adjustable sign of first aspect present invention preferred embodiment lamp control circuit; Said control unit is a single-chip microcomputer; And the AD of said single-chip microcomputer sampling input pin is connected with the moved end of said rotation frequency modulation switch, and the pwm signal output pin is connected to said PWM driver element.
In the described LED Frequency Adjustable sign of first aspect present invention preferred embodiment lamp control circuit; Said switch drive unit comprises first switching tube; First end of said first switching tube is connected to the negative electrode input of LED luminescence unit; The second end ground connection of said first switching tube, and said first control end of switching tube is connected to the pwm signal output pin of said single-chip microcomputer.
In the described LED Frequency Adjustable sign of first aspect present invention preferred embodiment lamp control circuit; Said control circuit also comprises: anti-reverse unit; Comprise second switch pipe and current-limiting resistance; First end of said second switch pipe links to each other with the negative output terminal of said power supply unit, the second end ground connection of said second switch pipe, and the control end of said second switch pipe is connected to the positive output end of power supply unit through said current-limiting resistance.
In the described LED Frequency Adjustable sign of first aspect present invention preferred embodiment lamp control circuit, said control circuit also comprises the constant current unit, is used for the electric current of said power supply unit output is carried out exporting to said LED luminescence unit after the constant current.
In the described LED Frequency Adjustable sign of first aspect present invention preferred embodiment lamp control circuit; Said LED luminescence unit comprises that head and the tail are connected the anode input of LED luminescence unit and at least one light-emitting diode between the negative electrode input in order, and said constant current unit is the current regulator diode that is connected between the anode input of positive output end and LED luminescence unit of said power supply unit; Perhaps said LED luminescence unit comprises the anode input that is connected in parallel on the LED luminescence unit and at least one light-emitting diode between the negative electrode input, and said constant current unit is the current regulator diode that is connected on the parallel branch of each light-emitting diode.
Second aspect present invention provides a kind of LED Frequency Adjustable sign lamp control method, may further comprise the steps: convert the flicker frequency conditioning signal that receives into voltage signal through the rotation frequency modulation switch; Adopt single-chip microcomputer to gather said voltage signal and carry out analog-to-digital conversion, discern the corresponding frequency modulation progression of said flicker frequency conditioning signal, and output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle; Convert said pwm signal into light that drive LED luminescence unit sends corresponding flicker frequency.
Third aspect present invention provides a kind of LED Frequency Adjustable sign lamp, comprises aforesaid LED Frequency Adjustable sign lamp control circuit.
LED Frequency Adjustable sign lamp and the control circuit and the control method of embodiment of the present invention; Has following beneficial effect: the corresponding frequency modulation progression of flicker frequency conditioning signal that the present invention receives through identification; And output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle; Realization identifies the control of the flicker frequency of lamp to the LED Frequency Adjustable, thereby can neatly flicker frequency be adjusted to different progression, and the LED sign lamp that has remedied prior art has only the deficiency of fixing flicker frequency.
The present invention for adopting DC-DC wave chopping technology driving LED, has the characteristics simple, reliable, that cost is low through adopting Single-chip Controlling in addition.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
The LED Frequency Adjustable sign lamp control circuit module diagram that Fig. 1 provides for first embodiment of the invention;
The LED Frequency Adjustable sign lamp control circuit module diagram that Fig. 2 provides for second embodiment of the invention;
The LED Frequency Adjustable that Fig. 3 provides for the embodiment of the invention identifies the concrete principle assumption diagram of control unit in the lamp control circuit;
The LED Frequency Adjustable with parallel connection LED load that Fig. 4 provides for the embodiment of the invention identifies the circuit diagram example of lamp control circuit;
The LED Frequency Adjustable with series LED load that Fig. 5 provides for the embodiment of the invention identifies the circuit diagram example of lamp control circuit.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.
The present invention discerns it through receiving the flicker frequency conditioning signal, exports the pwm signal in corresponding duty ratio and cycle, thereby the flicker frequency of the LED that adjustment is driven is consistent with the flicker frequency of expectation.
See also Fig. 1, the LED Frequency Adjustable that provides for first embodiment of the invention identifies the lamp control circuit module diagram.As shown in Figure 1, the LED Frequency Adjustable sign lamp control circuit that first embodiment of the invention provides comprises at least: power supply unit 11, signal receiving unit 12, control unit 13 and switch drive unit 14.This LED Frequency Adjustable sign lamp control circuit is used for the light that driving LED luminescence unit 15 sends different flicker frequencies.
Signal receiving unit 12 is used for converting the flicker frequency conditioning signal that receives into voltage signal through the rotation frequency modulation switch.Control unit 13 adopts single-chip microcomputer to gather said voltage signal and carry out analog-to-digital conversion, the pairing frequency modulation progression of flicker frequency conditioning signal that identification signal receiving element 12 receives, and have the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle.In other words, the corresponding frequency modulation progression of a kind of flicker frequency conditioning signal, thereby the corresponding pulse signal of output.Switch drive unit 14 is used for converting the pwm signal of control unit 13 outputs into light that drive LED luminescence unit 15 sends corresponding flicker frequency.11 of power supply units are used to this control circuit power supply, are signal receiving unit 12, control unit 13 and 14 power supplies of switch drive unit, and then are 15 power supplies of LED luminescence unit.
See also Fig. 2, the LED Frequency Adjustable that provides for second embodiment of the invention identifies the lamp control circuit module diagram.As shown in Figure 2, the difference of the second embodiment of the invention and first embodiment is further to have set up anti-reverse unit 16 and constant current unit 17.
Wherein, the input of anti-reverse unit 16 is connected to the output of power supply unit 11, and main effect is to prevent that the power supply input from connecing the components and parts that instead can burn out control circuit.Constant current unit 17 is used for the electric current of power supply unit 11 outputs is carried out exporting to said LED luminescence unit 15 after the constant current.Though be provided with anti-reverse unit 16 and constant current unit 17 in the present embodiment simultaneously, it will be understood by those skilled in the art that anti-reverse unit 16 and constant current unit 17 are all for alternatively but not the necessary circuit unit.
See also Fig. 3, the concrete principle assumption diagram of control unit in the LED Frequency Adjustable sign lamp control circuit that provides for the embodiment of the invention.As shown in Figure 3, this control unit 13 specifically comprises AD modular converter 21, pwm signal output module 22 and adjusting module 23.
Wherein, AD modular converter 21 is used for the voltage signal after signal receiving unit 12 conversions is carried out analog-to-digital conversion.Pwm signal output module 22 is used for output pwm signal.23 of adjusting modules are used for according to the flicker frequency conditioning signal after 21 conversions of AD modular converter; Search the expectation duty ratio and the cycle of corresponding frequency modulation progression, duty ratio and cycle that the duty ratio of the pwm signal of adjustment pwm signal output module 22 outputs and cycle equal said expectation.
See also Fig. 4, the circuit diagram example of the LED Frequency Adjustable sign lamp control circuit that provides for the embodiment of the invention with parallel connection LED load.Below in conjunction with Fig. 4 the circuit connecting relation of each circuit unit of LED Frequency Adjustable sign lamp control circuit provided by the invention is specified.
Power supply unit 11 can adopt powered battery.For example, lower to the requirement of operating voltage when load is parallel connection LED, can select the 3.7V lithium battery for use, compare and adopt 5V direct current supply, saved rectification circuit and voltage conversion circuit, be more suitable for being used for using at portable low-voltage light fixture.
Signal receiving unit 12 comprises sampling resistor R6～R10 that rotation frequency modulation switch K1, divider resistance R3 and a plurality of resistance do not wait.The moved end of rotation frequency modulation switch K1 is connected to the positive output end of power supply unit 11 through divider resistance R3; A plurality of not moved ends of rotation frequency modulation switch K1 are respectively through a sampling resistor ground connection; The moved end is once only logical with a motionless termination; When moved end and motionless termination are logical, obtain the flicker frequency conditioning signal thus, with dividing potential drop on the sampling resistor that moved end not links to each other acquired signal as Input Control Element 13.For example, " 0 " shelves are the direct ground connection in moved end not, and corresponding sampling resistor value is 0; The moved end is not through sampling resistor R6 ground connection for " 1 " shelves, and corresponding sampling resistor value is the resistance of R6, and by that analogy, the moved end is not through adopting resistance R 10 ground connection for " 5 " shelves, and corresponding sampling resistor value is the resistance of R10.The user can regulate the shelves number of rotation frequency modulation switch K1, thereby the moved end that will rotate frequency modulation switch K1 is not connected the moved end with one of them.Each is the resistance that differs greatly of the preferred resistance of sampling resistor R6～R10 that connects of moved end not, for example adopts 1k, 5k, 10k, 20k and 50k etc. respectively, thereby the magnitude of voltage that the not moved end of each gear is gathered differs greatly, and is convenient to control unit 13 and discerns.
Control unit 13 is mainly realized through control chip U1.The control chip U1 that adopts among the present invention is for having AD sampling function, and single-chip microcomputer that can output pwm signal.The AD sampling input pin PB0 (the 5th pin) of control chip U1 is connected with the moved end of rotation frequency modulation switch K1, thereby the voltage of rotation frequency modulation switch K1 moved end is gathered, and identifies the current set shelves number of rotation frequency modulation switch K1.The pwm signal output pin PB4 (the 3rd pin) of control chip U1 is connected to the input of PWM driver element 14.The power supply input pin VCC (the 8th pin) of control chip U1 is connected to the positive output end of power supply unit 11.The grounding pin GND of control chip U1 (the 4th pin) ground connection.
Switch drive unit 14 comprises the first switching tube Q1.The first switching tube Q1 can be the switching tube of any on-off actions such as triode, metal-oxide-semiconductor.In the present embodiment, the first switching tube Q1 adopts triode, and the base stage of triode is connected to the pwm signal output pin PB4 (the 3rd pin) of control chip U1 as the control end of the first switching tube Q1, receives pwm signal.The collector electrode of triode is connected to the negative electrode input of LED luminescence unit 15 as first end of the first switching tube Q1.The emitter of triode is as the second end ground connection of the first switching tube Q1.As a preferred embodiment of the present invention, switch drive unit 14 can also comprise: be connected the current-limiting resistance R4 between the control end of pwm signal output pin PB4 and the first switching tube Q1 of control chip U1.As another preferred embodiment of the present invention, switch drive unit 14 can also comprise: be connected the control end of the first switching tube Q1 and the pull down resistor R5 between the ground.
LED luminescence unit 15 comprises the anode input that is connected in parallel on LED luminescence unit 15 and at least one light-emitting diode between the negative electrode input, LED1 to LEDn+1 as shown in Figure 4.Light-emitting diode preferably can send the LED of ruddiness, and its penetrability is strong, and plays the effect of caution.As a preferred embodiment of the present invention; This drive circuit can also comprise constant current unit 17; When the LED load is parallel way in the present embodiment; Constant current unit 17 comprises the current regulator diode on the parallel branch that is connected on each light-emitting diode, current regulator diode ZD1-ZDn+1 as shown in Figure 4.Current regulator diode ZD1 carries out constant current to the electric current on the LED1 branch road, makes the LED1 operate as normal.
As a preferred embodiment of the present invention, this drive circuit can also comprise anti-reverse unit 16.Anti-reverse unit 16 comprises second switch pipe Q2 and current-limiting resistance R1.In the present embodiment, second switch pipe Q2 adopts metal-oxide-semiconductor to realize.The drain electrode of metal-oxide-semiconductor links to each other with the negative output terminal of power supply unit 11 as first end of second switch pipe Q2; Source electrode is as the second end ground connection of second switch pipe Q2, and grid is connected to the positive output end of power supply unit 11 through current-limiting resistance R1 as the control end of second switch pipe Q2.As a preferred embodiment of the present invention, switch drive unit 14 can also comprise: be connected the pull down resistor R2 between said second switch pipe Q2 control end and the ground.
See also Fig. 5, the circuit diagram example of the LED Frequency Adjustable sign lamp control circuit that provides for the embodiment of the invention with series LED load.The circuit connecting relation of each circuit unit and Fig. 4 are similar among Fig. 5, and difference only is that the connected mode of LED load is series connection in the LED luminescence unit 15, and needed supply voltage is higher relatively, thereby partial circuit has been carried out conversion.Only the difference of dual mode is partly specifically described below.
Power supply unit 11 can adopt direct current to supply power, and to satisfy the voltage request of load, for example positive output end is+24V, and negative output terminal is-24V.Because the power supply of power supply unit 11 positive output ends is too high,, current-limiting resistance R11 and voltage stabilizing didoe D1 in control unit 13, have been set up therefore in order to ensure the normal operation of control chip U1.Current-limiting resistance R11 and voltage stabilizing didoe D1 are connected between the positive output end and ground of power supply unit 11 successively; Node between current-limiting resistance R11 and the voltage stabilizing didoe D1 is connected to the power supply input pin VCC (the 8th pin) of control chip U1; Thereby the operating voltage of control chip U1 is maintained 5V, avoid power source change that control chip U1 is exerted an influence.LED luminescence unit 15 comprises that head and the tail are connected anode input and a plurality of light-emitting diodes between the negative electrode input, the for example LED1-LED7 of LED luminescence unit 15 in order.Wherein, the anode of first LED 1 is connected with the anode input of LED luminescence unit 15, and the negative electrode of last LED 7 is connected with the negative electrode input of LED luminescence unit 15.As a preferred embodiment of the present invention; This drive circuit can also comprise constant current unit 17; When the LED load was series system in the present embodiment, the constant current unit was the current regulator diode ZD1 that is connected between the anode input of positive output end and LED luminescence unit 15 of power supply unit 11.
For LED Frequency Adjustable sign lamp control circuit provided by the present invention is described further, to combine Fig. 4 and Fig. 5 that its operation principle is detailed following at present:
When entire circuit was worked, power supply unit 11 was with cell voltage or direct voltage output.The rotation frequency modulation switch K1 of signal receiving unit 12 is transferred to certain gear; Since divider resistance R3 with rotation frequency modulation switch K1 not the sampling resistor that connects of moved end supply voltage is carried out dividing potential drop, make that the magnitude of voltage at place, moved end of rotation frequency modulation switch K1 is different and different along with gear.Power supply unit 11 offers control chip U1 operating voltage; Control chip U1 samples to the magnitude of voltage at the place, moved end of rotation frequency modulation switch K1; The user's that i.e. conduct is gathered flicker frequency conditioning signal, thus identify the gear that rotates frequency modulation switch K1, i.e. frequency modulation progression.And export the control end that the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle are given the first switching tube Q1, control the break-make of the first switching tube Q1, thereby control LED luminescence unit 15 is luminous and extinguish with desired frequency.That is to say that control chip U1 carries out the sampling of A/D value to the magnitude of voltage at the place, moved end of rotation frequency modulation switch K1; Control chip U1 exports to the pulse signal of the control end of the first switching tube Q1 according to the size adjustment of A/D value, thereby reaches the purpose of adjustment LED flicker frequency.
Control unit 13 can be provided with flicker frequency according to the actual needs of sign lamp application scenario, exports corresponding pwm signal.A kind of exemplary and nonrestrictive flicker scheme is provided below:
When K1 points to 0 grade: turn-off output.The duty ratio of corresponding pwm signal is 0.
When K1 points to 1 grade: bright 1 second of LED, went out 3 seconds.The cycle of corresponding pwm signal is 4 seconds, and duty ratio is 1/4.
When K1 points to 2 grades: bright 1 second of LED, went out 2 seconds.The cycle of corresponding pwm signal is 3 seconds, and duty ratio is 1/3.
When K1 points to 3 grades: bright 1 second of LED, went out 1 second.The cycle of corresponding pwm signal is 2 seconds, and duty ratio is 1/2.
When K1 points to 4 grades: bright 0.5 second of LED, went out 0.5 second.The cycle of corresponding pwm signal is 1 second, and duty ratio is 1/2.
When K1 points to 5 grades: bright 0.2 second of LED, went out 0.2 second.The cycle of corresponding pwm signal is 0.4 second, and duty ratio is 1/2.
The embodiment of the invention also provides a kind of LED Frequency Adjustable sign lamp control method, may further comprise the steps:
At first, receive the flicker frequency conditioning signal through the rotation frequency modulation switch, and be converted into voltage signal.For example the user is through regulating the gear of above-mentioned rotation frequency modulation switch K1, and signal receiving unit 12 receives it as the flicker frequency conditioning signal.
Subsequently, adopt single-chip microcomputer to gather said voltage signal and carry out analog-to-digital conversion, discern the corresponding frequency modulation progression of said flicker frequency conditioning signal, and output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle according to said voltage signal.For example, above-mentioned control unit 13 is through the corresponding frequency modulation progression of the said flicker frequency conditioning signal of AD sampling identification, and output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle.
At last, convert said pwm signal into light that drive LED luminescence unit sends corresponding flicker frequency.For example, above-mentioned switch drive unit 14 converts the pwm signal of control unit 13 outputs into light that drive LED luminescence unit 15 sends corresponding flicker frequency.
The embodiment of the invention also provides a kind of LED Frequency Adjustable sign lamp, comprises aforesaid LED Frequency Adjustable sign lamp control circuit.
In sum; The corresponding frequency modulation progression of flicker frequency conditioning signal that the present invention receives through identification; And output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle; Realization identifies the control of the flicker frequency of lamp to the LED Frequency Adjustable, thereby can neatly flicker frequency be adjusted to different progression, has remedied the fixing deficiency of LED sign lamp flicker frequency of prior art.And; In the prior art; All is to adopt the DC-DC wave chopping technology to come driving LED in the place of low-voltage, its have cost height, complicated circuit, fragile, stronger shortcomings such as High-frequency Interference are arranged, brought inconvenience to the user; And the present invention has the characteristics simple, reliable, that cost is low through adopting Single-chip Controlling.
The present invention describes according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the present invention's technology, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.

Claims (10)

1. a LED Frequency Adjustable sign lamp control circuit is characterized in that, comprising:
Signal receiving unit converts the flicker frequency conditioning signal that receives into voltage signal through the rotation frequency modulation switch;
Control unit adopts single-chip microcomputer to gather said voltage signal and carry out analog-to-digital conversion, discerns the corresponding frequency modulation progression of said flicker frequency conditioning signal according to said voltage signal, and output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle;
The switch drive unit is used for converting said pwm signal into light that drive LED luminescence unit sends corresponding flicker frequency;
Power supply unit is used to said signal receiving unit, control unit, switch drive unit and the power supply of LED luminescence unit.
2. LED Frequency Adjustable sign lamp control circuit according to claim 1 is characterized in that said control unit comprises:
The AD modular converter, be used for said voltage signal is carried out analog-to-digital conversion;
The pwm signal output module, be used for output pwm signal;
Adjusting module, be used for according to the flicker frequency conditioning signal after the conversion of said AD modular converter; Search the expectation duty ratio and the cycle of corresponding frequency modulation progression, adjust duty ratio and cycle that duty ratio and the cycle of the pwm signal of said pwm signal output module output equal said expectation.
3. LED Frequency Adjustable sign lamp control circuit according to claim 1 and 2; It is characterized in that; Said signal receiving unit comprises the sampling resistor that rotation frequency modulation switch, divider resistance and a plurality of resistance do not wait; The moved end of said rotation frequency modulation switch is connected to the positive output end of said power supply unit through said divider resistance, and a plurality of not moved ends of said rotation frequency modulation switch are respectively through a said sampling resistor ground connection.
4. LED Frequency Adjustable sign lamp control circuit according to claim 3; It is characterized in that; Said control unit is a single-chip microcomputer, and the AD of said single-chip microcomputer sampling input pin is connected with the moved end of said rotation frequency modulation switch, and the pwm signal output pin is connected to said PWM driver element.
5. LED Frequency Adjustable sign lamp control circuit according to claim 4; It is characterized in that; Said switch drive unit comprises first switching tube; First end of said first switching tube is connected to the negative electrode input of LED luminescence unit, the second end ground connection of said first switching tube, and said first control end of switching tube is connected to the pwm signal output pin of said single-chip microcomputer.
6. LED Frequency Adjustable sign lamp control circuit according to claim 1 and 2; It is characterized in that; Said control circuit also comprises: anti-reverse unit, comprise second switch pipe and current-limiting resistance, and first end of said second switch pipe links to each other with the negative output terminal of said power supply unit; The second end ground connection of said second switch pipe, the control end of said second switch pipe is connected to the positive output end of power supply unit through said current-limiting resistance.
7. LED Frequency Adjustable sign lamp control circuit according to claim 1 and 2 is characterized in that said control circuit also comprises the constant current unit, is used for the electric current of said power supply unit output is carried out exporting to said LED luminescence unit after the constant current.
8. LED Frequency Adjustable sign lamp control circuit according to claim 7 is characterized in that:
Said LED luminescence unit comprises that head and the tail are connected the anode input of LED luminescence unit and at least one light-emitting diode between the negative electrode input in order, and said constant current unit is the current regulator diode that is connected between the anode input of positive output end and LED luminescence unit of said power supply unit; Perhaps
Said LED luminescence unit comprises the anode input that is connected in parallel on the LED luminescence unit and at least one light-emitting diode between the negative electrode input, and said constant current unit is the current regulator diode that is connected on the parallel branch of each light-emitting diode.
9. a LED Frequency Adjustable sign lamp control method is characterized in that, comprising:
Convert the flicker frequency conditioning signal that receives into voltage signal through the rotation frequency modulation switch;
Adopt single-chip microcomputer to gather said voltage signal and carry out analog-to-digital conversion, discern the corresponding frequency modulation progression of said flicker frequency conditioning signal, and output has the corresponding duty ratio of this frequency modulation progression and the pwm signal in cycle according to said voltage signal;
Convert said pwm signal into light that drive LED luminescence unit sends corresponding flicker frequency.
10. a LED Frequency Adjustable sign lamp is characterized in that, comprises any described LED Frequency Adjustable sign lamp control circuit among the claim 1-9.
CN2011101441050A 2011-05-31 2011-05-31 LED frequency-variable marker lamp and control circuit and control method of marker lamp Pending CN102811527A (en)

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CN104427686A (en) * 2013-08-23 2015-03-18 深圳市海洋王照明工程有限公司 Lamp and control circuit thereof
CN109150165A (en) * 2018-09-27 2019-01-04 宁波兴为汽车电子有限公司 A kind of automobile-used voltage regulator circuit and its operation method
CN109682464A (en) * 2018-12-28 2019-04-26 四川九洲电器集团有限责任公司 Photoelectric mark device and personal identification method based on photoelectric mark device
CN110098867A (en) * 2018-01-30 2019-08-06 京东方光科技有限公司 A kind of FM circuit, driving circuit and its control method, lighting system
CN112735366A (en) * 2020-12-24 2021-04-30 青岛鼎信通讯消防安全有限公司 PWM (pulse-width modulation) variable-frequency sound driving device for automatic fire alarm system and design method
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