CN202172518U - Pulse width modulation burst dimming device - Google Patents
Pulse width modulation burst dimming device Download PDFInfo
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- CN202172518U CN202172518U CN2011202820030U CN201120282003U CN202172518U CN 202172518 U CN202172518 U CN 202172518U CN 2011202820030 U CN2011202820030 U CN 2011202820030U CN 201120282003 U CN201120282003 U CN 201120282003U CN 202172518 U CN202172518 U CN 202172518U
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Abstract
The utility model discloses a pulse width modulation burst dimming device, comprising an infrared dimming signal generation unit, a current loop regulating circuit, an LED drive control circuit, and an LED driver. The infrared dimming signal generation unit generates pulse infrared dimming signals, the current loop regulating circuit outputs control signals controlling the LED drive control circuit after closed-loop regulation, and accordingly the control signals output by the LED drive control circuit can control the LED driver to output current having a preset amplitude, with a duty ratio of the current and a duty ratio of the pulse infrared dimming signals being equal or adding up to 1, for achieving the objective of regulation of LED load current. The pulse width modulation burst dimming device employs the pulse infrared dimming signals and thus is free from defects of short service lifetime and poor reliability caused by utilization of a conventional mechanical switch; and requires no direct contact with human bodies, thereby being easy to use and safe.
Description
Technical field
The application relates to the dimming light source technical field, particularly relates to a kind of width-modulation pulse light modulating device.
Background technology
PWM (Pulse Width Modulation, pulse width modulation) pulse light modulation device is used to regulate the state such as color, brightness of LED (Light Emitting Diode, light-emitting diode) light source.
Traditional P WM pulse light modulation device; Realize through the conventional switch form, such as, mechanical switchs such as rotary switch, key switch; The mechanical switch that is adopted be because phenomenons such as wearing and tearing, contact are aging can appear in long-term use, causes the useful life of said pwm pulse light modulating device short, reliability is low.
The utility model content
For solving the problems of the technologies described above, the application embodiment provides a kind of width-modulation pulse light modulating device, realizes the pwm pulse light modulation through infrared dim signal, and with the reliability that improves the pwm pulse light modulating device, prolong its useful life, technical scheme is following:
A kind of width-modulation pulse light modulating device comprises: infrared dim signal generation unit, electric current loop regulating circuit, LED Drive and Control Circuit, and led driver, wherein:
Two power inputs of said led driver connect the two ends of AC power respectively, and two outputs of this led driver connect the LED load;
First output of said infrared dim signal generation unit connects the first input end of said electric current loop regulating circuit, to said electric current loop regulating circuit the infrared pulse dim signal is provided;
Second input of said electric current loop regulating circuit connects an output of said led driver, the current signal of the said LED load that is used to sample, and the output of this electric current loop regulating circuit connects the first input end of said LED Drive and Control Circuit;
Second input of said LED Drive and Control Circuit links to each other with second output of said infrared dim signal generation unit; Be used to receive the pass machine control signal of said infrared dim signal generation unit output, the output of this LED Drive and Control Circuit links to each other with the control end of said led driver;
The control signal that said led driver provides according to the said LED Drive and Control Circuit that receives; Control the on off operating mode of the switching tube in the said led driver, so that the duty ratio of the current signal of led driver output equates with the duty ratio of said pulsed infrared dim signal or both sums are 1.
Preferably, said infrared dim signal generation unit comprises: infrared receiving/transmission unit and Logical processing unit, wherein:
Said infrared receiving/transmission unit comprises: infrared transmitting tube and infrared receiving tube,
Said infrared transmitting tube is used for producing and the outside infrared signal of sending; Said infrared receiving tube is used to receive the infrared signal that reflects through extraneous barrier and produce the infrared induction signal;
With the signal conversion unit that said infrared receiving tube is connected, be used for said infrared induction conversion of signals be said Logical processing unit the signal of telecommunication that can receive;
Said Logical processing unit links to each other with said signal conversion unit, is used for producing the pulsed infrared dim signal according to the signal of telecommunication that receives.
Preferably, said signal conversion unit comprises:
Comparator, the first input end of this comparator links to each other with the emitter of said infrared receiving tube, and second input connects first stabilized voltage power supply, and output links to each other with the input of said Logical processing unit.
Preferably, described width-modulation pulse light modulating device also comprises:
Positive ends connects the positive output end of said led driver, and the negative polarity end connects the output capacitance of the negative output terminal of said led driver;
First end and second end are serially connected in the negative output terminal of said led driver, the output control switch of the 3rd output coupling of control end and said infrared dim signal generation unit.
Preferably, described width-modulation pulse light modulating device also comprises:
The control end coupling of output and said output control switch, first drive circuit that input links to each other with the 3rd output of said infrared dim signal generation unit.
Preferably, said electric current loop regulating circuit comprises: first operational amplifier,
The in-phase input end of said first operational amplifier connects first reference power supply through the 4th current-limiting resistance; And this in-phase input end connects earth terminal through first control switch, first output coupling of the control end of said control switch and said infrared dim signal generation unit;
The inverting input of said first operational amplifier links to each other with an output of said led driver through first current-limiting resistance;
The output of said first operational amplifier links to each other with the first input end of said LED Drive and Control Circuit as the output of this electric current loop regulating circuit, and this output connects said inverting input through compensating network.
Preferably, said electric current loop regulating circuit also comprises:
The coupling of the control end of output and said first control switch, second drive circuit that input links to each other with first output of said infrared dim signal generation unit as the input of this electric current loop regulating circuit.
Preferably, said electric current loop regulating circuit comprises, second operational amplifier, wherein,
The in-phase input end of said second operational amplifier connects second reference power supply through the 3rd current-limiting resistance;
The inverting input of said second operational amplifier connects an output of said led driver through second current-limiting resistance; And this inverting input connects said second reference power supply through second control switch, and the control end of this second control switch links to each other with first output of said infrared dim signal generation unit;
The output of said second operational amplifier connects the first input end of said LED Drive and Control Circuit as the output of this electric current loop regulating circuit, and this output connects said inverting input through compensating network.
Preferably, said electric current loop regulating circuit also comprises:
The coupling of the control end of output and said second control switch, the 3rd drive circuit that input links to each other with first output of said infrared dim signal generation unit as the input of this electric current loop regulating circuit.
Technical scheme by above the application embodiment provides is visible; Pulsed infrared dim signal through infrared dim signal generation unit generation; After process electric current loop regulating circuit carries out closed-loop adjustment; Produce the control signal of control LED Drive and Control Circuit, thereby, the control signal control led driver output duty cycle of LED Drive and Control Circuit output is equated or both sums are 1, amplitude is to preset the electric current of amplitude with the duty ratio of said pulsed infrared dim signal.The duty ratio of pulsed infrared dim signal is big more, and then the mean value of led driver output current is big more, the brighter display of led light source; The duty ratio of pulsed infrared dim signal is more little, and then the mean value of led driver output current is more little, and the brightness of led light source is dark more; This width-modulation pulse light modulating device, owing to adopt the pulsed infrared dim signal, thereby defectives such as the weak point of having avoided using traditional mechanical switch to bring in useful life, reliability.And said noncontact dimming mode need not the directly said width-modulation pulse light modulating device of contact of human body, and is easy to use, safe.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing among the application, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of PWM light modulating device of the application embodiment;
Fig. 2 is the structural representation of the infrared dim signal generation unit of the application embodiment;
Fig. 3 is the circuit theory sketch map of a kind of PWM light modulating device of the application embodiment;
Fig. 4 is the circuit theory sketch map of the another kind of PWM light modulating device of the application embodiment;
Fig. 5 is the circuit theory sketch map of the another kind of PWM light modulating device of the application embodiment;
Fig. 6 is the circuit theory sketch map of the another kind of PWM light modulating device of the application embodiment;
Fig. 7 is the circuit theory sketch map of the another kind of PWM light modulating device of the application embodiment.
Embodiment
Describe for convenient, when supposing that described pulsed infrared dim signal duty ratio is maximum, led light source is the brightest; Duty ratio hour, led light source is the darkest; At the pulsed infrared dim signal is the time period of high level, the led driver output current, and this time period is called the Ton time; At the pulsed infrared dim signal is the low level time period, and led driver does not have output current, and this time period is called the Toff time.
In order to make those skilled in the art person understand the technical scheme among the application better; To combine the accompanying drawing among the application embodiment below; Technical scheme among the application embodiment is carried out clear, intactly description; Obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the application's protection.
See also Fig. 1, show a kind of structural representation of PWM light modulating device, this device comprises: infrared dim signal generation unit 100, electric current loop regulating circuit 200, LED Drive and Control Circuit 300, led driver 400, wherein:
Two power inputs of led driver 400 connect L end and the N end of AC power Vin respectively, and positive output end connects the anode of LED load, and negative output terminal connects the negative electrode of LED load, and wherein, said LED load can be made up of one or more led light source series connection.
The course of work of the PWM light modulating device that present embodiment provides is following:
Infrared dim signal generation unit 100 can produce the pulsed infrared dim signal according to extraneous barrier, wherein:
At the pulsed infrared dim signal is that the Ton of high level is in the time period; Pulsed infrared dim signal Control current ring regulating circuit 200 operate as normal: the electric current in the said LED load of sampling; And compare with the inner reference electrical signal of electric current loop regulating circuit 200; Output control signals to LED Drive and Control Circuit 300 through after the closed-loop adjustment, through the control signal of LED Drive and Control Circuit 300 outputs, the electric current of the preset amplitude of control led driver 400 outputs; At the pulsed infrared dim signal is that low level Toff is in the time period; The signal of telecommunication of pulsed infrared dim signal Control current ring regulating circuit 200 outputs remains unchanged; Simultaneously; Infrared dim signal generation unit 100 output shutdown control signal to LED Drive and Control Circuit 300, and then 400 shutdown of control led driver, and output current is zero.
In sum; The duty ratio of led driver 400 output currents is consistent with the duty ratio of pulsed infrared dim signal; The mean value that is led driver 400 output currents changes with the variation of the duty ratio of pulsed infrared dim signal, and concrete, the duty ratio of pulsed infrared dim signal is big more; Then the mean value of led driver output current is big more, the brighter display of led light source; The duty ratio of pulsed infrared dim signal is more little, and then the mean value of led driver output current is more little, and the brightness of led light source is dark more, finally realizes the PWM light modulation.
Need to prove that the current signal and the said pulsed infrared dim signal of led driver 400 outputs are complementary, promptly working as the pulsed infrared dim signal is the low level time period, the led driver output current; The pulsed infrared dim signal is the time period of high level, and during output current, the duty ratio of led driver 400 output currents and the duty ratio sum of pulsed infrared dim signal are not 1 to led driver.
During practical implementation, there are corresponding relation in the duty ratio of said pulsed infrared dim signal and the extraneous barrier time of staying.Such as, the infrared ray time of extraneous barrier reflective infrared dim signal generation unit 100 emissions is long more, and the duty ratio of said pulsed infrared dim signal is big more; Otherwise the infrared ray time of extraneous barrier reflective infrared dim signal generation unit 100 emissions is short more, and the duty ratio of said pulsed infrared dim signal is more little.
Preferably, see also Fig. 2, this infrared dim signal generation unit 100 comprises: infrared receiving/transmission unit 110 and Logical processing unit U0.
Infrared receiving/transmission unit 110 comprises: infrared transmitting tube Q1, infrared receiving tube Q2, signal conversion unit, wherein:
Infrared transmitting tube Q1 can produce infrared signal, and its anode connects source driving signal through current-limiting resistance R100, and negative electrode connects earth terminal.
Infrared receiving tube Q2 and infrared transmitting tube Q1 are located along the same line, and the collector electrode of this infrared receiving tube Q2 connects the first stabilized voltage power supply Vcc, and emitter connects earth terminal through sample resistance R200.
Signal conversion unit; Specifically can realize through comparator A; The first input end of this comparator links to each other with the emitter of said infrared receiving tube Q2; The input of second input has reference voltage signal Vref0, the voltage of its emitter when this reference voltage signal Vref0 is set less than infrared receiving tube Q2 conducting, and output links to each other with the input of Logical processing unit U0.
When extraneous barrier stops place, infrared receiving/transmission unit; The infrared signal that infrared transmitting tube Q1 produces is reflected by extraneous barrier and is received by infrared receiving tube Q2, at this moment, and infrared receiving tube Q2 conducting; Voltage signal on the emitter of Q2 inputs to the first input end of comparator A; At this moment, this voltage signal is greater than said reference voltage signal, and the signal of this comparator output overturns; And offer Logical processing unit U0, and then by Logical processing unit U0 output level or pulse light modulation signal.
Introduce the concrete implementation of PWM light modulating device below with concrete example message.
See also Fig. 3; Show a kind of circuit theory sketch map of PWM light modulating device; This PWM light modulating device comprises: infrared dim signal generation unit 100, electric current loop regulating circuit 210, LED Drive and Control Circuit 300, led driver 400; The negative output terminal of led driver 400 is made as with reference to the ground end, can also be serially connected with current-limiting resistance R0 between the negative electrode of this negative output terminal and LED load, wherein:
Two power inputs of led driver 400 connect L end and the N end of AC power Vin respectively, and positive output end connects the anode of LED load, and negative output terminal connects the negative electrode of LED load, and wherein, said LED load can be made up of one or more led light source series connection.
Concrete, electric current loop regulating circuit 210 comprises:
Operational amplifier U1; Its in-phase input end connects the first reference power supply Vref1 through the 4th current-limiting resistance R4; This in-phase input end connects earth terminal through the first control switch S1 simultaneously, and the control end of control switch S1 is connected to first output 101 of said infrared dim signal generation unit 100 through second drive circuit 211;
The inverting input of operational amplifier U1 is connected to the negative electrode of said LED load through the first current-limiting resistance R1; The output 203 of operational amplifier U1 connects the first input end 301 of said LED Drive and Control Circuit 300, and simultaneously, this output is connected to inverting input through compensating network.
The course of work of this PWM light modulating device is following:
At the pulsed infrared dim signal is the Ton of high level in the time, and the control signal of infrared dim signal generation unit 100 first outputs 101 outputs is controlled second drive circuit, 211 output low levels; The first control switch S1 is turn-offed; Make electric current loop regulating circuit 200 operate as normal, i.e. current signal in the LED load that obtains through first current-limiting resistance R1 sampling that receives of the inverting input of operational amplifier U1 compares with the first reference power supply Vref1 of in-phase input end; Through after the closed-loop control; Output control signals to LED Drive and Control Circuit 300, thereby, by the electric current of the preset amplitude of LED Drive and Control Circuit 300 control led drivers, 400 outputs;
At the pulsed infrared dim signal is low level Toff in the time, and the control signal of first output, 101 outputs of infrared dim signal generation unit 100 is controlled second drive circuit, 211 output high level; Make the first control switch S1 conducting; The inverting input of operational amplifier U1 and the current potential of in-phase input end are zero, and then the signal of telecommunication of this operational amplifier U1 output remains unchanged, simultaneously; Second output, the 102 output off signals of said infrared dim signal generation unit 100 are to LED Drive and Control Circuit 300; And then, 400 shutdown of control led driver, output current is zero.
Need to prove; Electric current in the LED load is 0 o'clock; If the signal of telecommunication of operational amplifier U1 output changes, then still can adjust the size of the electric current of led driver output, be not 0 thereby make the LED electric current; So when led driver 400 output currents are zero, the signal of telecommunication of operational amplifier U1 output is remained unchanged.
In sum, the mean value of the electric current of led driver 400 outputs changes with the variation of the duty ratio of pulsed infrared dim signal, and wherein, the duty ratio of pulsed infrared dim signal can be with extraneous barrier time of staying monotone variation.
See also Fig. 4, show the circuit theory sketch map of another kind of PWM light modulating device, the concrete structure of the electric current loop regulating circuit 210 among the electric current loop regulating circuit among this embodiment and the corresponding embodiment of Fig. 3 is different.
This PWM light modulating device comprises: infrared dim signal generation unit 100, electric current loop regulating circuit 220, LED Drive and Control Circuit 300, led driver 400; The negative output terminal of led driver 400 is made as with reference to ground; Can also be serially connected with current-limiting resistance R0 between the negative electrode of this negative output terminal and LED load, wherein:
Said electric current loop regulating circuit 220 comprises:
Operational amplifier U2; Its in-phase input end connects the second reference power supply Vref2 through current-limiting resistance R3; Inverting input connects the negative electrode of said LED load through the second current-limiting resistance R2; And this inverting input connects the said second reference power supply Vref2 through the second control switch S2, and the control end of the second control switch S2 links to each other with first output 101 of said infrared dim signal generation unit 100 through the 3rd drive circuit 221;
The output of operational amplifier U2 connects the first input end 301 of said LED Drive and Control Circuit 300 as the output of this electric current loop regulating circuit 220, and this output connects said inverting input through compensating network.
The course of work of this PWM light modulating device is following:
At the pulsed infrared dim signal is that the Ton of high level is in the time; The control signal of first output, 101 outputs of infrared dim signal generation unit 100 makes the 3rd drive circuit 221 output low levels, and the second control switch S2 is turn-offed, and makes electric current loop regulating circuit 220 operate as normal; It is the current signal in the LED load that sampling obtains through the second current-limiting resistance R2 that receives of the inverting input of operational amplifier U1; Compare with the second reference power supply Vref2 of in-phase input end,, output control signals to LED Drive and Control Circuit 300 through after the closed-loop control; Thereby, by the electric current of the preset amplitude of LED Drive and Control Circuit 300 control led drivers, 400 outputs;
At the pulsed infrared dim signal is that low level Toff is in the time; Infrared dim signal generation unit 100 controls the 3rd drive circuit 221 output high level; Make the second control switch S2 conducting; The inverting input of operational amplifier U2 and the current potential of in-phase input end equate, are the current potential of the second reference power supply Vref2, and then the output of this operational amplifier U2 remains unchanged.Simultaneously, second output, the 102 output off signals of said infrared dim signal generation unit 100 are to LED Drive and Control Circuit 300, thereby by 400 shutdown of LED Drive and Control Circuit 300 control led drivers, output current is zero.
In sum, the mean value of the electric current of led driver 400 outputs changes with the variation of the duty ratio of pulsed infrared dim signal, and wherein, the duty ratio of pulsed infrared dim signal can be with extraneous barrier time of staying monotone variation.
See also Fig. 5, show the circuit theory sketch map of another kind of PWM light modulating device, different is that this device also comprises output capacitance C1 and output control switch S0 with the corresponding embodiment of Fig. 1.
The positive ends of said output capacitance C1 connects the positive output end of led driver 400, and the negative polarity end of output capacitance C1 connects the negative output terminal of led driver 400.
Output control switch S0 is serially connected between the negative electrode of negative output terminal and LED load of led driver, and the control end of output control switch S0 links to each other with the 3rd output 103 of infrared dim signal generation unit 100 through first drive circuit 500.
The course of work of this PWM light modulating device is following:
At the pulsed infrared dim signal is the Ton of high level in the time period, and the pulsed infrared dim signal is controlled first drive circuit, 500 output high level, makes said output control switch S0 conducting; Simultaneously, pulsed infrared dim signal Control current ring regulating circuit 200 operate as normal, the electric current in the said LED load of promptly sampling; And compare with the inner reference electrical signal of electric current loop regulating circuit 200; Output control signals to LED Drive and Control Circuit 300 through after the closed-loop adjustment, through the control signal of LED Drive and Control Circuit 300 outputs, control led driver 400 is with the electric current of preset amplitude; Be output capacitance C1 charging, and energy be provided for the LED load;
At the pulsed infrared dim signal is that low level Toff is in the time period; The signal of telecommunication of pulsed infrared dim signal Control current ring regulating circuit 200 outputs remains unchanged; Simultaneously; Infrared dim signal generation unit 100 output shutdown control signal to LED Drive and Control Circuit 300, and then 400 shutdown of control led driver, said first drive circuit, 500 output low levels of simultaneously infrared dim signal generation unit 100 controls; Said output control switch S0 is turn-offed, and finally making the electric current in the LED load is zero.
Need to prove that when Toff was longer, the voltage on the output capacitance C1 possibly raise; Thereby to LED load output energy; Cause the current amplitude in the LED load to be higher than set point, therefore, infrared dim signal generation unit 100 produces off signal to LED Drive and Control Circuit 300 at Toff in the time period; And then control led driver 400 quits work; Thereby the voltage that suppresses on the output capacitance C1 continues to raise, and the current amplitude in the LED load no longer changes, and finally realizes the accurate light modulation of led light source.
But when the capacity of output capacitance C1 is enough big, even under the maximum situation of Toff, when the voltage on the output capacitance C1 can not raise yet, said infrared dim signal generation unit need not to produce off signal, still can realize the accurate light modulation to led light source.
See also Fig. 6; Show a kind of concrete circuit theory sketch map of the corresponding embodiment of Fig. 5; This device comprises: infrared dim signal generation unit 100, electric current loop regulating circuit 210, LED Drive and Control Circuit 300, led driver 400, output capacitance C1, output control switch S0, wherein:
The positive ends of said output capacitance C1 connects the positive output end of led driver 400, and the negative polarity end of output capacitance C1 connects the negative output terminal of led driver 400.The negative output terminal of led driver 400 is made as with reference to ground, can also be serially connected with current-limiting resistance R0 between the negative electrode of this negative output terminal and LED load.
Output control switch S0 is serially connected between the negative electrode of negative output terminal and LED load of led driver, and the control end of output control switch S0 links to each other with the 3rd output 103 of infrared dim signal generation unit 100 through first drive circuit 500.
Electric current loop regulating circuit 210 comprises:
Operational amplifier U1; Its in-phase input end connects the first reference power supply Vref1 through the 4th current-limiting resistance R4; This in-phase input end connects earth terminal through the first control switch S1 simultaneously, and the control end of control switch S1 is connected to first output 101 of said infrared dim signal generation unit 100 through second drive circuit 211;
The inverting input of operational amplifier U1 is connected to the negative electrode of said LED load through the first current-limiting resistance R1; The output of operational amplifier U1 connects the first input end 301 of said LED Drive and Control Circuit 300, and simultaneously, this output is connected to inverting input through compensating network.
The course of work of this PWM light modulating device is following:
At the pulsed infrared dim signal is the Ton of high level in the time period, and the control signal of the 3rd output 103 outputs of infrared dim signal generation unit 100 is controlled first drive circuit, 500 output high level, makes said output control switch S0 conducting; The control signal of second output, 102 outputs is controlled second drive circuit, 211 output low levels, and the first control switch S1 is turn-offed, and makes electric current loop regulating circuit 200 operate as normal; It is the operational amplifier U1 inverting input electric current in the said LED load of sampling; Compare with the first reference power supply Vref1 of in-phase input end,, output control signals to LED Drive and Control Circuit 300 through after the closed-loop adjustment; Control signal through 300 outputs of LED Drive and Control Circuit; Control led driver 400 is output capacitance C1 charging with the electric current of preset amplitude, and energy is provided for the LED load;
At the pulsed infrared dim signal is that low level Toff is in the time; The control signal of first output, 101 outputs of infrared dim signal generation unit 100; Control second drive circuit, 211 output high level; The first control switch S1 conducting, inverting input and the in-phase input end of operational amplifier U1 are zero potential, and then the output of this operational amplifier U1 remains unchanged.The control signal of the 3rd output 103 outputs of infrared dim signal generation unit 100 is controlled first drive circuit, 500 output low levels, and output control switch S0 turn-offs, and the electric current of LED load is zero.Simultaneously, second output, the 102 output off signals of said infrared dim signal generation unit 100 are to LED Drive and Control Circuit 300, thereby by 400 shutdown of LED Drive and Control Circuit 300 control led drivers, output current is zero.
Need to prove, when the electric current in the LED load is 0, if do not control led driver 400 shutdown; Then led driver 400 also can output current signal; Constantly be capacitor C 1 charging, when control switch S0 conducting next time, output current can be raised to very high moment; So when control output control switch S0 turn-offs, need 400 shutdown of control led driver.
See also Fig. 7, show the circuit theory sketch map of another kind of PWM light modulating device, different with the corresponding embodiment of Fig. 5 is that the concrete structure of electric current loop regulating circuit is different.
This device comprises: infrared dim signal generation unit 100, electric current loop regulating circuit 220, LED Drive and Control Circuit 300, led driver 400, output capacitance C1, output control switch S0, wherein:
Said electric current loop regulating circuit 220 comprises:
Operational amplifier U2; Its in-phase input end connects the second reference power supply Vref2 through the 3rd current-limiting resistance R3; Inverting input connects the negative electrode of said LED load through the second current-limiting resistance R2; And this inverting input connects the said second reference power supply Vref2 through the second control switch S2, and the control end of the second control switch S2 links to each other with first output 101 of said infrared dim signal generation unit 100 through the 3rd drive circuit 221;
The output of operational amplifier U2 connects the first input end 301 of said LED Drive and Control Circuit 300 as the output of this electric current loop regulating circuit 220, and this output connects said inverting input through compensating network.
The course of work of this PWM light modulating device is following:
At the pulsed infrared dim signal is the Ton of high level in the time period, and the control signal of the 3rd output 103 outputs of infrared dim signal generation unit 100 is controlled first drive circuit, 500 output high level, makes said output control switch S0 conducting; The control signal of second output, 102 outputs is controlled the 3rd drive circuit 221 output low levels; The second control switch S2 is turn-offed, and then make electric current loop regulating circuit 200 operate as normal, be i.e. the operational amplifier U2 inverting input electric current in the said LED load of sampling; Compare with the second reference power supply Vref2 of in-phase input end; Through after the closed-loop adjustment, output control signals to LED Drive and Control Circuit 300, through the control signal of LED Drive and Control Circuit 300 outputs; Control led driver 400 is output capacitance C1 charging with the electric current of preset amplitude, and energy is provided for the LED load;
At the pulsed infrared dim signal is that low level Toff is in the time; The control signal of first output, 101 outputs of infrared dim signal generation unit 100; Control the 3rd drive circuit 221 output high level, the second control switch S2 conducting, the inverting input of operational amplifier U2 and in-phase input end current potential equate; Be the current potential of the second reference power supply Vref2, then the output of this operational amplifier U2 remains unchanged.The control signal of the 3rd output 103 outputs of infrared dim signal generation unit 100 is controlled first drive circuit, 500 output low levels, and output control switch S0 turn-offs, and the electric current of LED load is zero.Simultaneously, second output, the 102 output off signals of said infrared dim signal generation unit 100 are to LED Drive and Control Circuit 300, thereby by 400 shutdown of LED Drive and Control Circuit 300 control led drivers, output current is zero.
Need to prove that the infrared dim signal generation unit in the PWM light modulating device that above-mentioned all embodiment of the application provide can comprise one or more infrared receiving/transmissions unit, the application does not limit this.
Need to prove; First control switch in the application's the foregoing description, second control switch and output control switch all can be realized through switching tube, and be concrete; Said switching tube can be triode or MOS (metal-oxid-semiconductor, metal-oxide semiconductor (MOS)) pipe.
Need to prove; The application's the foregoing description; For the control signal that guarantees the output of infrared dim signal generation unit can the drive controlling switch; Set up first, second, third drive circuit, avoided because the pulsed infrared dim signal of infrared dim signal generation unit output can't drive the phenomenon generation of said control switch.Certainly, when the pulsed infrared dim signal of infrared dim signal generation unit output is enough to the drive controlling switch, need not to set up first, second, third drive circuit.And drive controlling switch conduction when hypothesis first, second, third drive circuit is exported high level in the application's the foregoing description; The drive controlling switch turn-offs during output low level; During concrete the application; Characteristic and connected mode in conjunction with the control switch of selecting for use confirm that the signal of said drive circuit output is a high level drive controlling switch conduction, or the conducting of low level drive controlling switch.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses all is the difference with other embodiment.Device embodiment described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; The parts that show as the unit can be or can not be physical locations also; Promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of present embodiment scheme according to the needs selection some or all of module wherein of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.
The above only is the application's a embodiment; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the application's protection range.
Claims (9)
1. a width-modulation pulse light modulating device is characterized in that, comprising: infrared dim signal generation unit, electric current loop regulating circuit, LED Drive and Control Circuit, and led driver, wherein:
Two power inputs of said led driver connect the two ends of AC power respectively, and two outputs of this led driver connect the LED load;
First output of said infrared dim signal generation unit connects the first input end of said electric current loop regulating circuit, to said electric current loop regulating circuit the infrared pulse dim signal is provided;
Second input of said electric current loop regulating circuit connects an output of said led driver, the current signal of the said LED load that is used to sample, and the output of this electric current loop regulating circuit connects the first input end of said LED Drive and Control Circuit;
Second input of said LED Drive and Control Circuit links to each other with second output of said infrared dim signal generation unit; Be used to receive the pass machine control signal of said infrared dim signal generation unit output, the output of this LED Drive and Control Circuit links to each other with the control end of said led driver;
The control signal that said led driver provides according to the said LED Drive and Control Circuit that receives; Control the on off operating mode of the switching tube in the said led driver, so that the duty ratio of the current signal of led driver output equates with the duty ratio of said pulsed infrared dim signal or and is 1.
2. width-modulation pulse light modulating device according to claim 1 is characterized in that, said infrared dim signal generation unit comprises: infrared receiving/transmission unit and Logical processing unit, wherein:
Said infrared receiving/transmission unit comprises: infrared transmitting tube and infrared receiving tube,
Said infrared transmitting tube is used for producing and the outside infrared signal of sending; Said infrared receiving tube is used to receive the infrared signal that reflects through extraneous barrier and produce the infrared induction signal;
With the signal conversion unit that said infrared receiving tube is connected, be used for said infrared induction conversion of signals be said Logical processing unit the signal of telecommunication that can receive;
Said Logical processing unit links to each other with said signal conversion unit, is used for producing the pulsed infrared dim signal according to the signal of telecommunication that receives.
3. width-modulation pulse light modulating device according to claim 2 is characterized in that, said signal conversion unit comprises:
Comparator, the first input end of this comparator links to each other with the emitter of said infrared receiving tube, and second input connects first stabilized voltage power supply, and output links to each other with the input of said Logical processing unit.
4. width-modulation pulse light modulating device according to claim 1 is characterized in that, also comprises:
Positive ends connects the positive output end of said led driver, and the negative polarity end connects the output capacitance of the negative output terminal of said led driver;
First end and second end are serially connected in the negative output terminal of said led driver, the output control switch of the 3rd output coupling of control end and said infrared dim signal generation unit.
5. width-modulation pulse light modulating device according to claim 4 is characterized in that, also comprises:
The control end coupling of output and said output control switch, first drive circuit that input links to each other with the 3rd output of said infrared dim signal generation unit.
6. according to any described width-modulation pulse light modulating device in the claim 1 to 5, it is characterized in that said electric current loop regulating circuit comprises: first operational amplifier,
The in-phase input end of said first operational amplifier connects first reference power supply through the 4th current-limiting resistance; And this in-phase input end connects earth terminal through first control switch, first output coupling of the control end of said control switch and said infrared dim signal generation unit;
The inverting input of said first operational amplifier links to each other with an output of said led driver through first current-limiting resistance;
The output of said first operational amplifier links to each other with the first input end of said LED Drive and Control Circuit as the output of this electric current loop regulating circuit, and this output connects said inverting input through compensating network.
7. width-modulation pulse light modulating device according to claim 6 is characterized in that, said electric current loop regulating circuit also comprises:
The coupling of the control end of output and said first control switch, second drive circuit that input links to each other with first output of said infrared dim signal generation unit as the input of this electric current loop regulating circuit.
8. according to any described width-modulation pulse light modulating device in the claim 1 to 5, it is characterized in that said electric current loop regulating circuit comprises, second operational amplifier, wherein,
The in-phase input end of said second operational amplifier connects second reference power supply through the 3rd current-limiting resistance;
The inverting input of said second operational amplifier connects an output of said led driver through second current-limiting resistance; And this inverting input connects said second reference power supply through second control switch, and the control end of this second control switch links to each other with first output of said infrared dim signal generation unit;
The output of said second operational amplifier connects the first input end of said LED Drive and Control Circuit as the output of this electric current loop regulating circuit, and this output connects said inverting input through compensating network.
9. width-modulation pulse light modulating device according to claim 8 is characterized in that, said electric current loop regulating circuit also comprises:
The coupling of the control end of output and said second control switch, the 3rd drive circuit that input links to each other with first output of said infrared dim signal generation unit as the input of this electric current loop regulating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202820030U CN202172518U (en) | 2011-08-04 | 2011-08-04 | Pulse width modulation burst dimming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202820030U CN202172518U (en) | 2011-08-04 | 2011-08-04 | Pulse width modulation burst dimming device |
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| Publication Number | Publication Date |
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| CN202172518U true CN202172518U (en) | 2012-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202820030U Expired - Lifetime CN202172518U (en) | 2011-08-04 | 2011-08-04 | Pulse width modulation burst dimming device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102665344A (en) * | 2012-05-08 | 2012-09-12 | 浙江英飞特节能技术有限公司 | Dimming circuit |
| CN103687212A (en) * | 2013-11-29 | 2014-03-26 | 青岛威力电子科技有限公司 | High-brightness LED lamp and control circuit |
| CN103906297A (en) * | 2012-12-28 | 2014-07-02 | 欧普照明股份有限公司 | A light source drive circuit and a lamp with the drive circuit |
-
2011
- 2011-08-04 CN CN2011202820030U patent/CN202172518U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102665344A (en) * | 2012-05-08 | 2012-09-12 | 浙江英飞特节能技术有限公司 | Dimming circuit |
| CN102665344B (en) * | 2012-05-08 | 2014-08-27 | 浙江英飞特节能技术有限公司 | Dimming circuit |
| CN103906297A (en) * | 2012-12-28 | 2014-07-02 | 欧普照明股份有限公司 | A light source drive circuit and a lamp with the drive circuit |
| CN103687212A (en) * | 2013-11-29 | 2014-03-26 | 青岛威力电子科技有限公司 | High-brightness LED lamp and control circuit |
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