CN101854759B - Drive circuit for controlling electric energy of light source, method and system - Google Patents
Drive circuit for controlling electric energy of light source, method and system Download PDFInfo
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- CN101854759B CN101854759B CN200910207776XA CN200910207776A CN101854759B CN 101854759 B CN101854759 B CN 101854759B CN 200910207776X A CN200910207776X A CN 200910207776XA CN 200910207776 A CN200910207776 A CN 200910207776A CN 101854759 B CN101854759 B CN 101854759B
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Abstract
The invention discloses a drive circuit for controlling electric energy of a light source, a method and a system. The drive circuit comprises a power convertor which is respectively connected with a power supply and a light source and a dimming controller connected with the power convertor; the power convertor receives the electric energy from the power supply and supplies an electric energy after adjustment for the light source; the power convertor includes a control switch in serial connection with the light source; the dimming controller monitors the power switch between the power supply and the drive circuit and receives the dimming request signal and the dimming stop signal; the dimming request signal indicates the first group of actions of the power switch and the dimming stop signal indicates the second group of actions of the power switch. If receiving the dimming request signal, the dimming controller controls the control switch to continuously adjust the electric energy which is output from the power convertor after adjustment; and if receiving the dimming stop signal, the dimming controller stops the electric energy which is output from the power convertor after adjustment.
Description
Technical field
The present invention relates to a kind of drive circuit and method and system of light source being carried out controlling electric energy.
Background technology
In recent years, light-emitting diode new type light sources such as (LED) has all been obtained progress in material and manufacturing.LED has high efficiency, and the long-life, characteristics such as bright-colored can be applied to automobile, computer, communication, fields such as military and commodity.Such as, the LED lamp can substitute traditional incandescent lamp as lighting source.
Figure 1 shows that a kind of schematic diagram of traditional led drive circuit 100.Led drive circuit 100 utilizes LED chain 106 as light source.LED chain 106 comprises the LED of a plurality of series connection.Electric power converter 102 is used for the VD Vout that DC input voitage Vin converts expectation to is used for to 106 power supplies of LED chain.Thereby the switch 104 that links to each other with electric power converter 102 can be communicated with LED chain 106 or disconnect and opens or closes the LED lamp with input voltage vin.Electric power converter 102 receives from the feedback signal of current sense resistance R sen and regulates output voltage V out so that LED chain 106 produces the brightness of expectation.One of shortcoming of this traditional scheme is, this expectation brightness is pre-set, and in use, the user can't regulate brightness.
Figure 2 shows that the schematic diagram of the led drive circuit 200 that another kind is traditional.Electric power converter 102 is used for the VD Vout that DC input voitage Vin converts expectation to is used for to 106 power supplies of LED chain.Thereby the switch 104 that links to each other with electric power converter 102 can be communicated with LED chain 106 or disconnect and opens or closes the LED lamp with input voltage vin.LED chain 106 links to each other with linear current adjuster 208.Operational amplifier 210 comparison reference signal REF in the linear current adjuster 208 and from the current monitoring signal of current sense resistance R sen, and generation control signal, regulate the resistance of transistor Q1 in the mode of linearity, thereby the electric current of the LED chain 106 of flowing through can be regulated accordingly.Using this traditional scheme, is the light output of control LED chain 106, and the user need utilize certain dedicated devices, such as a custom-designed switch that has the switch of adjusting button or can receive remote signal, regulates reference signal REF.
Summary of the invention
The invention provides a kind of drive circuit that light source is carried out controlling electric energy.This drive circuit comprises an electric power converter and a light adjusting controller.Electric power converter links to each other with light source with power supply, receives from the electric energy of power supply and for light source electric energy after the adjusting is provided.This electric power converter comprises a control switch of connecting with described light source.Light adjusting controller links to each other with electric power converter, can monitor a mains switch that is connected between described power supply and the described drive circuit, and receives light modulation request signal and light modulation termination signal.The light modulation request signal is indicated first group of action of described mains switch.The light modulation termination signal is indicated second group of action of described mains switch.Light adjusting controller is when receiving described light modulation request signal, by controlling the electric energy after described control switch is adjusted the described adjusting of described electric power converter output continuously, and when receiving described light modulation termination signal, stop to adjust electric energy after the described adjusting of described electric power converter output; Described light adjusting controller comprises: trigger monitoring means, be used to receive described light modulation request signal and described light modulation termination signal; With the dimmer that described triggering monitoring means links to each other, be used to produce dim signal to adjust the target energy value of described electric power converter.
The present invention also provides a kind of light source is carried out the system of controlling electric energy, comprising: with the electric power converter that power supply links to each other with light source, being used to receive from the electric energy of described power supply and for described light source provides electric energy after the adjusting; The light adjusting controller that links to each other with described electric power converter, be used to monitor the mains switch that links to each other with described power supply, and when monitoring first group of described mains switch action, begin to adjust continuously electric energy after the described adjusting of described electric power converter output up to the second group of action that monitors described mains switch, described light adjusting controller comprises: trigger monitoring means, be used to monitor first group of action and second group of action of described mains switch; Dimmer with described triggering monitoring means links to each other comprises: clock generator is used for the beginning clocking in response to the described first group of action that monitors described mains switch; Counter by described clock signal drives is used to produce count value; And the digital to analog converter that links to each other with described counter, be used for producing described dim signal according to the described count value of described counter; Described dimmer is used for according to described dim signal by the control control switch of connecting with described light source to adjust the target energy value of described electric power converter.
The present invention also provides a kind of light source has been carried out the method for controlling electric energy, comprises the following steps: to utilize the electric energy after the adjusting of electric power converter output to be light source power supply; Trigger monitoring means and receive the light modulation request signal, this light modulation request signal indication is connected in first group of action of the mains switch between power supply and the described electric power converter; Dimmer produces dim signal according to described light modulation request signal; Electric energy after the described adjusting that the described dimmer control switch that control is connected with described light source according to described dim signal is exported with the described electric power converter of continuous adjustment; When described triggering monitoring means received the light modulation termination signal, described dimmer stopped to adjust the electric energy after the described adjusting of described electric power converter output, and wherein, this light modulation termination signal is indicated second group of action of described mains switch.
Adopt drive circuit of the present invention and light source is carried out the system and method for controlling electric energy, the user moves the light modulation process that starts by mains switch being imposed first group.In this light modulation process, the brightness of light source progressively strengthens or weakens.When reaching the brightness of expectation, the user moves the light modulation process that stops by mains switch being imposed second group again.Therefore, the user needn't use other device (as external dimmer or custom-designed switch with light modulation button) to carry out light modulation.
Description of drawings
Below, can further understand purpose of the present invention, specific structural features and advantage by to the description of some embodiments of the present invention in conjunction with its accompanying drawing.
Figure 1 shows that a kind of circuit diagram of traditional led drive circuit;
Figure 2 shows that the circuit diagram of the led drive circuit that another kind is traditional;
Figure 3 shows that the block diagram of light source driving circuit according to an embodiment of the invention;
Figure 4 shows that the circuit diagram of light source driving circuit according to an embodiment of the invention;
Figure 5 shows that the structural representation of the light adjusting controller among Fig. 4;
Figure 6 shows that the signal waveform schematic diagram under the simulation light-modulating mode;
Figure 7 shows that the signal waveform schematic diagram under the pulse light modulation pattern;
Figure 8 shows that the function mode schematic diagram of light source driving circuit according to an embodiment of the invention, this light source driving circuit includes the light adjusting controller shown in Fig. 5;
Figure 9 shows that the method flow diagram that according to an embodiment of the invention light source is carried out controlling electric energy.
Figure 10 shows that the circuit diagram of light source driving circuit according to an embodiment of the invention;
Figure 11 shows that the structural representation of the light adjusting controller among Figure 10;
Figure 12 shows that the function mode schematic diagram of light source driving circuit according to an embodiment of the invention, this light source driving circuit includes the light adjusting controller shown in Figure 11;
Figure 13 shows that the method flow diagram that according to an embodiment of the invention light source is carried out controlling electric energy.
Embodiment
Below will provide detailed reference to embodiments of the invention.Although the present invention sets forth by these execution modes and illustrates, it should be noted that the present invention not merely is confined to these execution modes.On the contrary, all substitutes, variant and the equivalent in defined invention spirit of appended claim and the invention scope contained in the present invention.
In addition, for better explanation the present invention, provided numerous details in the embodiment hereinafter.It will be understood by those skilled in the art that does not have these details, and the present invention can implement equally.In the other example, method, formality, element and the circuit known for everybody are not described in detail, so that highlight purport of the present invention.
Figure 3 shows that the block diagram of light source driving circuit 300 according to an embodiment of the invention.In one embodiment, light source driving circuit 300 comprises the AC/DC converter 306 that is used for be converted to VD Vout from the AC-input voltage Vin of power supply, be connected in the mains switch 304 that selectivity connects power supply and light source driving circuit 300 that is used between power supply and the AC/DC converter 306, the LED chain 312 that is used to that links to each other with AC/DC converter 306 provides the electric power converter 310 of regulating the back electric energy, link to each other with the electric power converter 310 switch monitor signal that is used to receive 304 actions of indication mains switch and according to the light adjusting controller 308 of switch monitor signal control electric power converter 310 outputs, and be used for the current monitor 314 of monitoring stream through the electric current of LED chain 312.In one embodiment, mains switch 304 is the mains switches that place on the metope.
In operation, AC/DC converter 306 is converted to VD Vout with input ac voltage Vin.Electric power converter 310 receives direct voltage Vout and provides voltage after the adjusting for LED chain 312.Current monitor 314 produces the current monitoring signal, and this current monitoring signal is indicated the size of the electric current of the LED chain 312 of flowing through.The action of light adjusting controller 308 monitoring mains switches 304 receives the current monitoring signal from current monitor 314, and controls electric power converter 310 to regulate the electric energy of LED chain 312 according to the action of mains switch 304.In one embodiment, light adjusting controller 308 works in the simulation light-modulating mode, regulates the electric energy of LED chain 312 by the reference signal of regulating a decision LED current peak.In another embodiment, light adjusting controller 308 works in pulse light modulation (burst dimming) pattern, recently regulates the electric energy of LED chain 312 by the duty of regulating a pulse width modulating signal (pwm signal).By regulating the electric energy of LED chain 312, the brightness of LED chain 312 can access accordingly and regulate.
Figure 4 shows that the circuit diagram of light source driving circuit 400 according to an embodiment of the invention.Fig. 4 will be described in conjunction with Fig. 3.Number identical parts with Fig. 3 among Fig. 4 and have similar function, do not do being repeated in this description for simplicity's sake at this.
Light source driving circuit 400 comprises the electric power converter 310 that is connected between power supply and the LED chain 312, and being used to receive from the electric energy of power supply and for LED chain 312 provides electric energy after the adjusting.In the example of Fig. 4, electric power converter 310 is to comprise inductance L 1, the step-down controller of diode D4 and control switch Q16.Among the embodiment among Fig. 4, control switch Q16 is positioned at the outside of light adjusting controller 308.In other embodiment, control switch Q16 also can be integrated in the inside of light adjusting controller 308.
Light adjusting controller 308 receiving key monitor signals and the switch Q16 that connects with LED chain 312 according to this switch monitor signal control are with the electric energy after the adjusting of regulating electric power converter 310 (comprising inductance L 1, diode D4 and control switch Q16) output.The action of this switch monitor signal indication mains switch (as be connected between power supply and the light source driving circuit mains switch 304).Light source driving circuit 400 further comprises AC/DC converter 306, is used for converting AC-input voltage Vin to VD Vout.Light source driving circuit 400 also comprises current monitor 314, is used for the electric current of monitoring stream through LED chain 312.In example shown in Figure 4, AC/DC converter 306 is to comprise diode D1, D2, D7, D8, the bridge rectifier of D10 and capacitor C 9.Current monitor 314 comprises current sense resistance R 5.
In one embodiment, the port of light adjusting controller 308 comprises: HV GATE, SEL, CLK, RT, VDD, CTRL, MON and GND.Port HV_GATE links to each other with switch Q27 by resistance R 3, is used to control the conducting state (as the state of on/off) of the switch Q27 that links to each other with LED chain 312.Capacitor C 11 is connected between port HV_GATE and the ground, is used to adjust the grid voltage of switch Q27.
The user can select a port SEL to be connected to ground (as shown in Figure 4) or port SEL is directly connected to ground by resistance R 4, can correspondingly select to simulate light-modulating mode or pulse light modulation pattern.
Port CLK is connected to AC/DC converter 306 by resistance R 3, is connected to ground by resistance R 6 simultaneously.Port CLK receives a switch monitor signal, the action of this switch monitor signal indication mains switch 304.In one embodiment, the switch monitor signal produces on a node between resistance R 3 and the resistance R 6.Capacitor C 12 is in parallel with resistance R 6, is used for the unnecessary noise of filtering.Port RT links to each other with ground by resistance R 7, is used for determining the frequency of the pulse signal that produced by light adjusting controller 308.
Port VDD links to each other with switch Q27 by diode D9, is used to light adjusting controller 308 power supplies.In one embodiment, an energy-storage units (as capacitor C 10) is connected between port VDD and the ground, is light adjusting controller 308 power supplies when mains switch 304 disconnects.In another embodiment, energy-storage units is integrated in light adjusting controller 308 inside.Port GND links to each other with ground.
Port CTRL links to each other with switch Q16.Switch Q16 connects with LED chain 312 and switch Q27, and is connected to ground by current monitoring resistance R 5.Light adjusting controller 308 is by the conducting state of the control signal control switch Q16 that exports on port CTRL, with the electric energy after the adjusting of adjusting electric power converter 310 outputs.Port MON links to each other with current monitoring resistance R 5, is used to receive the current monitoring signal of the electric current of indicating the LED chain 312 of flowing through.When switch Q27 connected, light adjusting controller 308 was regulated the electric current of the LED chain 312 of flowing through by control switch Q16.
In operation, when mains switch 304 was connected, AC/DC converter 306 was converted to VD Vout with the alternating voltage Vin of input.The voltage that has the predeterminated voltage value on the port HV_GATE puts on the switch Q27 by resistance R 3, thereby connects switch Q27.
If light adjusting controller 308 is connected switch Q16, direct voltage Vout can be to 312 power supplies of LED chain and to inductance L 1 charging.The electric current inductance L 1 of flowing through, LED chain 312, switch Q27, switch Q16 and resistance R 5 are to ground.If light adjusting controller 308 cut-off switch Q16, the electric current inductance L 1 of flowing through then, LED chain 312 and diode D4.Inductance L 1 discharge is to give the LED chain 312 power supplies.Therefore, light adjusting controller 308 can pass through control switch Q16, can adjust the electric energy after the adjusting of electric power converter 310 output.
When mains switch 304 disconnections, light adjusting controller 308 power supplies are thought in capacitor C 10 discharges.The voltage at resistance R 6 two ends drops to 0, thereby light adjusting controller 308 can monitor the switch monitor signal of indication mains switch 304 opening operations on port CLK.Similarly, connect when mains switch 304, the voltage at resistance R 6 two ends rises to a predeterminated voltage value, thereby light adjusting controller 308 can monitor the switch monitor signal of indication mains switch 304 making operations on port CLK.If monitor opening operation, light adjusting controller 308 can pull down to the voltage on the port HV_GATE 0 with cut-off switch Q27, thereby LED chain 312 is de-energized after making inductance L 1 thoroughly discharge.After monitoring the opening operation of mains switch 304, light adjusting controller 308 is regulated a reference signal, the expectation brightness of this reference signal indication LED chain 312.When mains switch connection 304 next time, the brightness of LED chain 312 can be adjusted according to the expectation brightness after regulating.In other words, the output brightness of LED chain 312 can be adjusted according to the opening operation of mains switch 304 by light adjusting controller 308.
Figure 5 shows that the structural representation of the light adjusting controller 308 among Fig. 4.Fig. 5 will be described in conjunction with Fig. 4.Number identical parts with Fig. 4 among Fig. 5 and have similar function, do not do being repeated in this description for simplicity's sake at this.
In one embodiment, if the voltage on the port VDD is higher than first predeterminated voltage, then startup and low pressure lock-in circuit 508 will start parts all in the light adjusting controller 308.When mains switch 304 disconnects,, start and low pressure lock-in circuit 508 will cut out in the light adjusting controller 308 miscellaneous part except triggering monitoring means 506 and dimmer 502 with the saving electric energy if the voltage on the port VDD is lower than second predeterminated voltage.If the voltage on the port VDD is lower than the 3rd predeterminated voltage, startup and low pressure lock-in circuit 508 will be closed and be triggered monitoring means 506 and dimmer 502.In one embodiment, first predeterminated voltage is higher than second predeterminated voltage, and second predeterminated voltage is higher than the 3rd predeterminated voltage.Because light adjusting controller 308 can be by capacitor C 10 through port VDD power supply, so after even if mains switch 304 disconnects, trigger monitoring means 506 and dimmer 502 and can also work a period of time.
In light adjusting controller 308, port SEL links to each other with current source 532.The user can select light-modulating mode by configured port SEL, such as port SEL is directly linked to each other with ground, or port SEL is linked to each other with ground by a resistance.In one embodiment, light-modulating mode decides by the voltage on the measurement port SEL.If port SEL directly links to each other with ground, then the voltage on the port SEL is similar to 0.One control circuit (not shown) can be connected switch 540, cut-off switch 541 and 542, thus light adjusting controller 308 can work in the simulation light-modulating mode, and by adjusting the electric energy that reference signal REF adjusts LED chain 312.In one embodiment, if port SEL is connected to ground (shown in Fig. 4) by resistance R 4, and R4 has a default resistance, and the voltage on the port SEL is greater than 0 so.This control circuit cut-off switch 540 is connected switch 541 and 542.Thereby light adjusting controller 308 works in the pulse light modulation pattern, and recently adjusts the electric energy of LED chain 312 by the duty of adjusting pulse width modulating signal PWM1.In other words, by control switch 540,541,542 conducting state can be selected different light-modulating modes.And the conducting state of switch 540,541,542 is determined by the voltage on the port SEL.
Pulse signal producer 504 is connected to ground by port RT and resistance R 7, produces the pulse signal 536 that is used to connect switch Q16.Pulse signal producer 504 can have different structures, is not limited to the structure shown in Fig. 5.
In pulse signal producer 504, the in-phase end of operational amplifier 510 receives predeterminated voltage V1, so the backward end voltage of operational amplifier 510 also is V1.Electric current I RT flows to ground by port RT and resistance R 7.The electric current I 1 of mos field effect transistor (MOSFET) 514 and mos field effect transistor 515 of flowing through has same size with electric current I RT.Mos field effect transistor 514 and mos field effect transistor 512 constitute current mirror, and the electric current I 2 of the mos field effect transistor 512 of therefore flowing through also has identical size with electric current I RT.The output of the output of comparator 516 and comparator 518 links to each other with the R input with the S input of set-reset flip-floop 520 respectively.The backward end of comparator 516 receives predeterminated voltage V2.The in-phase end of comparator 518 receives predeterminated voltage V3.In one embodiment, V2 greater than V3 and V3 greater than 0.Capacitor C 4 is connected between mos field effect transistor 512 and the ground, and an end links to each other with node between comparator 516 in-phase ends and comparator 518 backward ends.The Q output of set-reset flip-floop 520 links to each other with switch Q15, also links to each other with the S input of set-reset flip-floop 522 simultaneously.Switch Q15 is in parallel with capacitor C 4.The conducting state of switch Q15 is by the Q output decision of set-reset flip-floop 520.
The initial voltage at capacitor C 4 two ends is approximately 0, less than V3.Therefore the R input of set-reset flip-floop 520 receives the digital signal 1 of comparator 518 outputs.The Q output of set-reset flip-floop 520 is changed to digital signaling zero, thus cut-off switch Q15.When switch Q15 disconnection, capacitor C 4 is charged under the effect of electric current I 2, so the voltage at capacitor C 4 two ends raises.When the C4 both end voltage greater than V2, the S input of set-reset flip-floop 520 receives the digital signal 1 of comparator 516 outputs.The Q output of set-reset flip-floop 520 is changed to digital signal 1, thereby connects switch Q15.When switch Q15 connection, capacitor C 4 is by switch Q15 discharge, thereby the voltage at two ends reduces.Voltage when capacitor C 4 two ends drops to V3, comparator 518 output digital signals 1, and the Q output of set-reset flip-floop 520 is changed to digital signaling zero, thus cut-off switch Q15.After this capacitor C 4 is charged again under the effect of electric current I 2.As previously mentioned, pulse signal producer pulse signal producer 504 produces pulse signal 536 at the Q of set-reset flip-floop 520 output, and this pulse signal 536 includes series of pulses.Pulse signal 536 is transferred into the S input of set-reset flip-floop 522.
Trigger the action of monitoring means 506 by port CLK monitoring mains switch 304.If the action of mains switch 304 is monitored at port CLK, triggers monitoring means 506 and produce a drive signal with actuation counter 526.In one embodiment, when mains switch 304 is switched on, the voltage on the port CLK rises, and this voltage equals the voltage at resistance R 6 (shown in Figure 4) two ends.When mains switch 304 is disconnected, the voltage on the port CLK drops to 0.Therefore, the switch monitor signal of indication mains switch 304 actions can be monitored at port CLK.In one embodiment, move when port CLK is monitored to, trigger monitoring means 506 and produce drive signals when a disconnection.
Trigger the conducting state that monitoring means 506 also passes through port HV_GATE control switch Q27.When mains switch 304 is switched on, the puncture voltage at Zener diode ZD1 two ends is applied to switch Q27 by resistance R 3, thereby connects switch Q27.Thereby trigger monitoring means 506 and the voltage of port HV_GATE can be pulled down to 0 cut-off switch Q27.In one embodiment, on port CLK, monitor the disconnection action of mains switch 304, trigger monitoring means 506 with regard to cut-off switch Q27.On port CLK, monitor the ON Action of mains switch 304, trigger monitoring means 506 and just connect switch Q27.
In one embodiment, dimmer 502 comprises and triggers the counter 526 that monitoring means 506 links to each other, and is used for the action of mains switch 304 is counted.Dimmer 502 also comprises the digital to analog converter 528 that links to each other with counter 526, and the pulse width modulating signal generator 530 that links to each other with digital to analog converter 528.Counter 526 is driven by the drive signal that triggers monitoring means 506 generations.Specifically, when mains switch 304 disconnects, trigger monitoring means 506 and on port CLK, monitor a trailing edge, thereby produce a drive signal.The count value of counter 526 increases progressively (such as adding 1) under the effect of this drive signal.Digital to analog converter 528 reads count value from counter 526, and produces dim signal (this dim signal can be control signal 538 or reference signal REF) according to count value.Dim signal can be used for adjusting the target energy value of electric power converter 310, thereby adjusts the brightness of LED chain 312.
Under the pulse light modulation pattern, switch 540 disconnects, and switch 541 and 542 is connected.The backward end of comparator 534 receives reference signal REF1.REF1 is the direct current signal with predeterminated voltage value.The voltage of REF1 has determined the current peak of LED chain 312, thereby has also determined the high-high brightness of LED chain 312.Under this pulse light modulation pattern, dim signal promptly puts on the control signal 538 on the pulse width modulating signal generator 530, and this control signal 538 can be adjusted the duty ratio of pulse width modulating signal PWM1.By adjusting the duty ratio of PWM1, make the brightness of LED chain 312 be equal to or less than the high-high brightness of REF1 decision.Such as, if the duty ratio of PWM1 is 100%, then LED chain 312 has high-high brightness.If the duty ratio of PWM1 is less than 100%, then the brightness of LED chain 312 is lower than high-high brightness.
Under the simulation light-modulating mode, switch 540 is connected, and switch 541 and 542 disconnects.Under this simulation light-modulating mode, dim signal is reference signal REF.This reference signal REF is an analog signal, has adjustable voltage.Digital to analog converter 528 is adjusted the voltage of REF according to the count value of counter 526.The voltage of REF has determined the current peak of LED chain 312, thereby has also determined the high-high brightness of LED chain 312.Therefore, by adjusting REF, the brightness of LED chain 312 can correspondingly be adjusted.
In one embodiment, the count value increase of counter makes digital to analog converter 528 turn down the voltage of REF.Such as, if count value is 0, then the voltage of digital to analog converter 528 adjustment REF is V4.Thereby make count value be increased to 1 if trigger monitoring means 506 in the disconnection action that port CLK monitors mains switch 304, then the voltage of digital to analog converter 528 adjustment REF is V5, and V5 is less than V4.In another embodiment, the count value increase of counter makes digital to analog converter 528 heighten the voltage of REF.
In one embodiment, when the count value of counter 526 reached maximum, count value was changed to 0 again.If counter 526 is one 2 digit counters, count value will be increased to 1,2,3 successively since 0, get back to 0 then behind the 4th opening operation.Accordingly, the brightness of LED chain 312 is adjusted to the second level successively from the first order, the third level, and the fourth stage is got back to the first order then again.
The backward end of comparator 534 can optionally receive reference signal REF or reference signal REF1.Under the simulation light-modulating mode, the backward end of comparator 534 receives reference signal REF by switch 540.Under the pulse light modulation pattern, the backward end of comparator 534 receives reference signal REF1 by switch 541.The in-phase end of comparator 534 links to each other with current monitoring resistance R 5 by port MON, to receive the current monitoring signal SEN from current monitoring resistance R 5.When switch Q27 and Q16 open, the flow through size of current of LED chain 312 of the voltage of current monitoring signal SEN representative.
The output of comparator 534 links to each other with the R input of set-reset flip-floop 522.The Q output of set-reset flip-floop 522 with link to each other with door 524.The pulse width modulating signal PWM1 that pulse width modulating signal generator 530 produces is applied to and door 524.With door 524 output control signals, by port CTRL control Q16.
If selected the simulation light-modulating mode, switch 540 is connected, and switch 541 and 542 disconnects.Switch Q16 is by set-reset flip-floop 522 controls.Connect when mains switch 304, the puncture voltage at Zener diode ZD1 two ends makes switch Q27 connect.Under the effect of the pulse signal 536 that pulse signal producer 504 produces, set-reset flip-floop 522 produces digital signal 1 at the Q output, makes switch Q16 connect.The electric current inductance L 1 of flowing through, LED chain 312, switch Q27, switch Q16, current monitoring resistance R 5 is to ground.Because inductance L 1 stops the saltus step of electric current, this electric current can increase gradually.The voltage at current monitoring resistance R 5 two ends (being the voltage of current monitoring signal SEN) can increase thereupon.When the voltage of the SEN voltage greater than reference signal REF, comparator 534 output digital signals 1 are to the R input of set-reset flip-floop 522, thereby set-reset flip-floop 522 output digital signaling zeros make switch Q16 disconnect.After switch Q16 disconnected, inductance L 1 discharge was to power to LED chain 312.The inductance L 1 of flowing through, the electric current of LED chain 312 and diode D4 reduces gradually.When set-reset flip-floop 522 when the S input receives a pulse, switch Q16 connects, the electric current of LED chain 312 flows to ground by current monitoring resistance R 5.When the voltage of the current monitoring signal SEN voltage greater than reference signal REF, switch Q16 is disconnected by set-reset flip-floop 522 once more.As mentioned above, reference signal REF determined the to flow through peak value of LED chain 312 electric currents has also promptly determined the brightness of LED chain 312.By adjusting REF, the brightness of LED chain 312 is correspondingly adjusted.
Under the simulation light-modulating mode, if mains switch 304 is disconnected, capacitor C 10 (shown in Figure 4) discharge is to power to light adjusting controller 308.When triggering monitoring means 506 when port CLK monitors the disconnection action of mains switch 304, the count value of counter 526 adds 1.The disconnection action of mains switch 304 makes and triggers monitoring means 506 cut-off switch Q27.The change of count value makes digital to analog converter 528 adjust to second magnitude of voltage to the voltage of reference signal REF from first magnitude of voltage.Therefore, when mains switch 304 was connected once more, the brightness of LED chain 312 was adjusted because of the adjustment of reference signal REF.
If the strobe pulse light-modulating mode, switch 540 disconnects, and switch 541 and 524 is connected.The backward end of comparator 534 receives the reference signal REF1 with predeterminated voltage value.Switch Q16 by set-reset flip-floop 522 and pulse width modulating signal PWM1 by controlling jointly with door 524.Reference signal REF1 has determined the peak current of LED chain 312, has also promptly determined the high-high brightness of LED chain 312.The duty ratio of pulse width modulating signal PWM1 has determined the on/off time of switch Q16.When pulse width modulating signal PWM1 was digital signal 1, the conducting state of switch Q16 was by the output decision of the Q output of set-reset flip-floop 522.When pulse width modulating signal PWM1 was digital signaling zero, switch Q16 disconnected.By adjusting the duty ratio of pulse width modulating signal PWM1, can adjust the electric energy of LED chain 312 accordingly.So reference signal REF1 and pulse width modulating signal PWM1 determine the brightness of LED chain 312 jointly.
Under the pulse light modulation pattern, when mains switch 304 disconnects, this opening operation monitors at the port CLK monitoring means 506 that is triggered.Triggering monitoring means 506 disconnects Q27 and produces drive signal.Under the effect of drive signal, the count value of counter 526 increases (such as adding 1).Digital to analog converter 528 produces control signal 538, makes the duty ratio of pulse width modulating signal PWM1 become the second level from the first order.Therefore, when mains switch 304 is connected once more, the brightness of LED chain 312 will be that target is adjusted with the target brightness value.And this target brightness value is determined jointly by reference signal REF1 and pulse width modulating signal PWM1.
Figure 6 shows that the signal waveform schematic diagram under the simulation light-modulating mode.Comprising the electric current 602 of the LED chain 312 of flowing through, pulse signal 536, the output V522 of set-reset flip-floop 522, with the output V524 of door 524, and the on/off state of switch Q16.Fig. 6 will be described in conjunction with Fig. 4 and Fig. 5.
Pulse signal producer 504 produces pulse signal 536.Under the effect of pulse signal 536 each pulse, set-reset flip-floop 522 produces digital signal 1 at the Q output.And set-reset flip-floop 522 can make switch Q16 connect in Q output generation digital signal 1.When switch Q16 connection, inductance L 1 charging, electric current 602 increases.When electric current 602 reaches peak I max, also be the voltage of current monitoring signal SEN when equating with the voltage of reference signal REF, comparator 534 output digital signals 1 make set-reset flip-floop 522 at Q output output digital signaling zero to the R input of set-reset flip-floop 522.Set-reset flip-floop 522 can make switch Q16 disconnect at Q output output digital signaling zero, and inductance L 1 discharge is 312 power supplies of LED chain, and electric current 602 reduces.Under the simulation light-modulating mode, by adjusting reference signal REF, the average current value of the LED chain 312 of flowing through is correspondingly adjusted, thereby the brightness of LED chain 312 also obtains adjusting.
Figure 7 shows that the signal waveform schematic diagram under the pulse light modulation pattern.Comprising the electric current 602 of the LED chain 312 of flowing through, pulse signal 536, the output V522 of set-reset flip-floop 522, with the output V524 of door 524, the on/off state of switch Q16 and pulse width modulating signal PWM1.Fig. 7 will be described in conjunction with Fig. 4 and Fig. 5.
When PWM1 is digital signal 1, the electric current 602 of the LED chain 312 of flowing through, pulse signal 536, V522, the correlation between the on/off state of V524 and switch Q16 is similar to Fig. 6.When PWM1 is digital signaling zero, become digital signaling zero with the output of door 524.Thereby make switch Q16 disconnect and electric current 602 reduces.If PWM1 keeps the state long enough of digital signaling zero, electric current 602 can be reduced to 0.Under the pulse light modulation pattern, by adjusting the duty ratio of PWM1, the average current value of the LED chain 312 of flowing through is adjusted accordingly, thereby the brightness of LED chain 312 also obtains adjusting.
Figure 8 shows that the function mode schematic diagram of light source driving circuit according to an embodiment of the invention.Fig. 8 will be described in conjunction with Fig. 5.
In example shown in Figure 8, whenever triggering the disconnection action that monitoring means 506 monitors mains switch 304, the count value of counter 526 will add 1.Counter 526 is one two digit counters, and maximum count value is 3.
Under the simulation light-modulating mode, digital to analog converter 528 reads count value from counter 526.The increase of count value makes digital to analog converter 528 turn down the voltage of reference signal REF.The voltage of reference signal REF has determined the peak I max of LED chain 312 electric currents, has also promptly determined the mean value of LED chain 312 electric currents.Under the pulse light modulation pattern, digital to analog converter 528 reads count value from counter 526.The increase of count value makes digital to analog converter 528 turn down the duty ratio of pulse width modulating signal PWM1 (such as turn down 25% at every turn).Counter 526 is reset after reaching maximum count value (as 3).
Figure 9 shows that the method flow diagram that according to an embodiment of the invention light source is carried out controlling electric energy.Fig. 9 will be described in conjunction with Fig. 4 and Fig. 5.
In step 902, the electric energy after the adjusting that electric power converter (as electric power converter 310) provides is powered to light source (as LED chain 312).
In step 904, receiving key monitor signal (such as receiving) by light adjusting controller 308.The action of the mains switch (as mains switch 304) of this switch monitor signal indication between power supply and electric power converter.
In step 906, produce dim signal according to the switch monitor signal.
In step 908, the switch (as switch Q16) that control is connected with light source according to described dim signal, the electric energy after the adjusting that provides with the adjustment electric power converter.Adopt among the embodiment that simulates light-modulating mode at one, by comparing dim signal and representing the current monitoring signal of source current size to adjust electric power converter.Adopt among the embodiment of pulse light modulation pattern at another, by recently adjusting electric power converter with the duty of a pulse width modulating signal of described dim signal control.
As previously mentioned, the present invention discloses a kind of light source driving circuit, this light source driving circuit is adjusted the electric energy of light source according to the switch monitor signal of indication mains switch (as fixing mains switch on the wall) action.The electric energy of this light source is provided by electric power converter, and is adjusted by the switch that light adjusting controller is connected with light source by control.
The user can regulate the brightness of light source by the action (as disconnecting action) to the common power switch, and needn't use extra device (as custom-designed switch with light modulation button), thereby saves cost.
Figure 10 shows that the circuit diagram of light source driving circuit 1000 according to an embodiment of the invention.Figure 10 will be described in conjunction with Fig. 3.Number identical parts with Fig. 3 and Fig. 4 among Figure 10 and have similar function
Light source driving circuit 1000 comprises the electric power converter 310 that links to each other with LED chain 312 with power supply, and being used to receive from the electric energy of power supply and for LED chain 312 provides electric energy after the adjusting.Light adjusting controller 1008 is monitored the action of the mains switch 304 between power supply and light source driving circuit 1000 by the voltage on the monitoring port CLK.Light adjusting controller 1008 receives light modulation request signal and light modulation termination signal by port CLK.First group of action of this light modulation request signal indication mains switch 304, second group of action of this light modulation termination signal indication mains switch 304.If receive the light modulation request signal, the electric energy after the adjusting of light adjusting controller 1008 continuous adjustment electric power converters 310 outputs.If receive the light modulation termination signal, light adjusting controller 1008 stops to adjust the electric energy after the adjusting of electric power converter 310 outputs.In other words, if monitor first group of action of mains switch 304, the electric energy after the adjusting of the continuous adjustment of light adjusting controller 1008 beginnings electric power converter 310 outputs is up to the second group of action that monitors mains switch 304.In one embodiment, light adjusting controller 1008 is adjusted electric energy after the adjusting that electric power converter 310 exports by the control switch Q16 that connects with LED chain 312 of control.
Figure 11 shows that the structural representation of light adjusting controller 1008 among Figure 10, Figure 11 will be described in conjunction with Figure 10.Number identical parts with Fig. 4, Fig. 5 and Figure 10 among Figure 11 and have similar function
In the example of Figure 11, the similar of light adjusting controller 308 among the structure of light adjusting controller 1008 and Fig. 5.Difference is dimmer 1102 and triggers monitoring means 1106.In Figure 11, trigger monitoring means 1106 and receive light modulation request signal and light modulation termination signal, and produce signal EN and start or close clock generator 1104 by port CLK.Trigger monitoring means 1106 and also control the conducting state of the switch Q27 that links to each other with LED chain 312.
Under the simulation light-modulating mode, dimmer 1102 produces the electric energy that reference signal REF adjusts LED chain 312.Under the pulse light modulation pattern, dimmer 1102 produces the duty ratio that control signal 538 is adjusted pulse width modulating signal PWM1, thereby adjusts the electric energy of LED chain 312.In the example of Figure 11, the clock generator that is used for clocking 1104 that dimmer 1102 comprises and triggering monitoring means 1106 links to each other, by the counter 1126 of clock signal driving, and the digital to analog converter 528 that links to each other with counter 1126.Dimmer 1102 also further comprises the pulse width modulating signal generator 530 that links to each other with digital to analog converter 528.
When mains switch 304 is switched on or switched off, trigger monitoring means 1106 and can monitor voltage rising edge or trailing edge respectively at port CLK.Such as, when mains switch 304 disconnections, capacitor C 10 discharges are light adjusting controller 1108 power supplies.The voltage at resistance R 6 two ends drops to 0, can monitor a voltage trailing edge thereby trigger monitoring means 1106 on port CLK.Similarly, connect when mains switch 304, the voltage at resistance R 6 two ends rises to a default voltage, can monitor a voltage rising edge thereby trigger monitoring means 1106 on port CLK.As previously mentioned,, trigger the action that monitoring means 1106 can monitor mains switch 304, as ON Action or disconnection action by the voltage on the monitoring port CLK.
In one embodiment, when first group of action of mains switch 304 is monitored to, just triggers monitoring means 1106 and receive the light modulation request signal by port CLK.When second group of action of mains switch 304 is monitored to, just triggers monitoring means 1106 and receive the light modulation termination signal by port CLK.In one embodiment, first of mains switch 304 group of action comprises that first disconnects action and first ON Action thereafter.In one embodiment, second of mains switch 304 group of action comprises that second disconnects action and second ON Action thereafter.
Receive the light modulation request signal if trigger monitoring means 1106, the electric energy after the adjusting of the continuous adjustment of light adjusting controller 1108 beginnings electric power converter 310 outputs.Under the simulation light-modulating mode, light adjusting controller 1108 is adjusted the electric energy after the adjusting of electric power converter 310 outputs by the voltage of adjusting reference signal REF.Under the pulse light modulation pattern, light adjusting controller 1108 is recently adjusted the electric energy after the adjusting of electric power converter 310 outputs by the duty of adjusting pulse width modulating signal PWM1.
Receive the light modulation termination signal if trigger monitoring means 1106, light adjusting controller 1108 stops to adjust the electric energy after the adjusting of electric power converter 310 outputs.
Figure 12 shows that the function mode schematic diagram of light source driving circuit according to an embodiment of the invention, this light source driving circuit includes the light adjusting controller 1008 shown in Figure 11.Figure 12 will be described in conjunction with Figure 10 and Figure 11.
Suppose that initial time mains switch 304 disconnects.When mains switch 304 is connected by the user, electric power converter 310 is 312 power supplies of LED chain, and LED chain 312 has an original intensity.Under the simulation light-modulating mode, this original intensity is by the initial voltage decision of reference signal REF.Under the pulse light modulation pattern, this original intensity is by initial duty cycle (duty ratio such as the 100%) decision of pulse width modulating signal PWM1.Reference signal REF and pulse width modulating signal PWM1 are produced by the count value of digital to analog converter 528 according to counter 1126.Therefore, the initial duty cycle of the initial voltage of REF and PWM1 is by initial count value (such as the 0) decision of counter 1126.
In order to adjust the brightness of LED chain 312, the user can impose first group of action to mains switch 304.Under the effect of first group of action, produce the light modulation request signal.In one embodiment, first group of action comprises that first disconnects action and first ON Action thereafter.The result of its generation is to trigger monitoring means 1106 and monitor voltage trailing edge 1204 and voltage rising edge 1206 thereafter at port CLK.In response to the light modulation request signal, trigger monitoring means 1106 and produce EN signal, thereby start clock generator 1104 with clocking with high level.The counter 1126 that is driven by clock signal changes its count value in response to each clock pulse of clock signal.In the example of Figure 12, count value increases progressively under the effect of clock signal.In one embodiment, after counter 1126 reached its default maximum count value, it was 0 that count value is reset.In another embodiment, count value increases progressively up to counter 1126 and reaches default maximum count value, and count value is successively decreased and reached default least count value up to counter 1126 then.
Under the simulation light-modulating mode, digital to analog converter 528 reads count value from counter 1126, and turns down the voltage of reference signal REF in response to increasing progressively of count value.Under the pulse light modulation pattern, digital to analog converter 528 reads count value from counter 1126, and the duty ratio (such as turn down 10% at every turn) of turning down pulse width modulating signal PWM1 gradually along with increasing progressively of count value.Because the electric energy after the adjusting of electric power converter 310 outputs determines (under the pulse light modulation pattern) by the voltage decision (under the simulation light-modulating mode) of reference signal REF or by the duty ratio of pulse width modulating signal PWM1, so the brightness of LED chain 312 can be adjusted accordingly.
In case LED chain 312 reaches the brightness of expectation, the user moves and stops the brightness adjustment by mains switch 304 being imposed second group.Under the effect of second group of action, produce the light modulation termination signal.In one embodiment, second group of action comprises that second disconnects action and second ON Action thereafter.The result of its generation is to trigger monitoring means 1106 and monitor voltage trailing edge 1208 and voltage rising edge 1210 thereafter at port CLK.Under the effect of light modulation termination signal, trigger monitoring means 1106 generations and have low level EN signal, thereby close clock generator 1104.The counter 1126 that is driven by clock signal keeps its count value constant.Under the simulation light-modulating mode, the voltage of reference signal REF will remain unchanged.Under the pulse light modulation pattern, the duty ratio of pulse width modulating signal PWM1 will remain unchanged.Therefore, it is constant that LED chain 312 will keep the brightness of this expectation.
Figure 13 shows that the method flow diagram 1300 that according to an embodiment of the invention light source is carried out controlling electric energy.Figure 13 will be described in conjunction with Figure 10 and Figure 11.
In step 1302, light source (such as LED chain 312) is powered with the electric energy after the adjusting of electric power converter (as electric power converter 310) output.
In step 1304, receive light modulation request signal (such as receiving) by light adjusting controller 1108.This light modulation request signal indication is connected in first group of action of the mains switch (as mains switch 304) between described power supply and the described electric power converter.In one embodiment, first of mains switch group of action comprises that first disconnects action and first ON Action thereafter.
In step 1306, adjust the electric energy (adjusting) after the adjusting of electric power converter output continuously such as utilizing light adjusting controller 1108.In one embodiment, start clock generator 1104 and come actuation counter 1126.Count value according to counter 1126 produces dim signal (as control signal 538 or reference signal REF).Under the simulation light-modulating mode, adjust electric energy after the adjusting of described electric power converter output by the flow through current monitoring signal of light source of comparison reference signal REF and indication.The voltage of REF is determined by count value.Under the pulse light modulation pattern, adjust the electric energy after the adjusting of the recently described electric power converter output of duty of pulse width modulating signal PWM1 by control signal 538.The duty ratio of PWM1 is determined by count value.
In step 1308, receive light modulation termination signal (such as receiving) by light adjusting controller 1108.This light modulation termination signal indication is connected in second group of action of the mains switch (as mains switch 304) between described power supply and the described electric power converter.In one embodiment, second of mains switch group of action comprises that second disconnects action and second ON Action thereafter.
In step 1310,, then stop to adjust the electric energy after the adjusting of described electric power converter output if receive the light modulation termination signal.In one embodiment, close clock generator 1104 so that counter 1126 keeps its count value constant.The result of its generation is that under the simulation light-modulating mode, the voltage of reference signal REF remains unchanged; Under the pulse light modulation pattern, the duty ratio of pulse width modulating signal PWM1 remains unchanged.Therefore, light source can keep the brightness expected.
As previously mentioned, the present invention discloses a kind of light source driving circuit.If receive the light modulation request signal, this light source driving circuit will be adjusted the electric energy of light source automatically and continuously.If receive the light modulation termination signal, this light source driving circuit will stop to adjust the electric energy of light source.The user can move and begins the brightness adjustment process by mains switch (as fixing mains switch on the wall) being imposed first group.In the brightness adjustment process, the brightness of light source is increasing or decreasing progressively.If obtained the brightness of expectation, the user moves and stops the brightness adjustment process by mains switch being imposed second group.The user needn't use extra device (as external dimmer or custom-designed switch with light modulation button) to carry out brightness regulation, thereby saves cost.
Wording and expression in this use all are illustrative rather than definitive thereof, use these wording and express not and will get rid of outside invention scope, may have various modifications within the scope of the claims at any equivalent (or part equivalent) of the characteristic of this diagram and description.Other modification, variant and alternative also may exist.Therefore, claim is intended to contain all these type of equivalents.
Claims (21)
1. one kind is carried out the drive circuit of controlling electric energy to light source, comprising:
With power supply and the electric power converter that described light source links to each other, be used to receive from the electric energy of described power supply and for described light source provides electric energy after the adjusting, described electric power converter comprises a control switch of connecting with described light source;
The light adjusting controller that links to each other with described electric power converter, be used to monitor the mains switch that is connected between described power supply and the described drive circuit, receive the light modulation request signal of first group of action of indicating described mains switch and the light modulation termination signal of second group of action of the described mains switch of indication, and when receiving described light modulation request signal, by controlling the electric energy after described control switch is adjusted the described adjusting of described electric power converter output continuously, and when receiving described light modulation termination signal, stop to adjust electric energy after the described adjusting of described electric power converter output;
Described light adjusting controller comprises:
Trigger monitoring means, be used to receive described light modulation request signal and described light modulation termination signal;
With the dimmer that described triggering monitoring means links to each other, be used to produce dim signal to adjust the target energy value of described electric power converter.
2. drive circuit according to claim 1 is characterized in that, described light source is the light-emitting diode chain.
3. drive circuit according to claim 1, it is characterized in that, first group of action of described mains switch comprises that first disconnects action and first ON Action thereafter, and second group of action of described mains switch comprises that second disconnects action and second ON Action thereafter.
4. drive circuit according to claim 1 is characterized in that, described dimmer comprises:
Clock generator is used for clocking;
Counter with described clock generator links to each other is driven by described clock signal;
With the digital to analog converter that described counter links to each other, be used for producing described dim signal according to the count value of described counter,
Wherein, when receiving described light modulation request signal, described triggering monitoring means starts described clock generator driving described counter, and when receiving described light modulation termination signal, described triggering monitoring means is closed described clock generator to stop to drive described counter.
5. drive circuit according to claim 4, it is characterized in that, described light adjusting controller works in the pulse light modulation pattern, under this pulse light modulation pattern, described dimmer also comprises: the pulse width modulating signal generator that links to each other with described digital to analog converter, described pulse width modulating signal generator is used for producing a pulse width modulating signal to control described control switch according to described dim signal, and wherein, the duty ratio of described pulse width modulating signal is determined by described dim signal.
6. drive circuit according to claim 1, it is characterized in that, described light adjusting controller works in the simulation light-modulating mode, under this simulation light-modulating mode, described light adjusting controller also comprises: a comparator that links to each other with described dimmer, described comparator is used for more described dim signal and indication current monitoring signal of electric current of described light source of flowing through, and produces control signal to control described control switch.
7. one kind is carried out the system of controlling electric energy to light source, comprising:
With the electric power converter that power supply links to each other with light source, being used to receive from the electric energy of described power supply and for described light source provides electric energy after the adjusting;
The light adjusting controller that links to each other with described electric power converter, be used to monitor the mains switch that links to each other with described power supply, and when monitoring first group of described mains switch action, begin to adjust continuously electric energy after the described adjusting of described electric power converter output up to the second group of action that monitors described mains switch, described light adjusting controller comprises:
Trigger monitoring means, be used to monitor first group of action and second group of action of described mains switch;
Dimmer with described triggering monitoring means links to each other comprises:
Clock generator is used for the beginning clocking in response to the described first group of action that monitors described mains switch;
Counter by described clock signal drives is used to produce count value; And
With the digital to analog converter that described counter links to each other, be used for producing described dim signal according to the described count value of described counter;
Described dimmer is used for according to described dim signal by the control control switch of connecting with described light source to adjust the target energy value of described electric power converter.
8. system according to claim 7 is characterized in that, described electric power converter comprises:
The control switch of connecting with described light source;
Wherein, described light adjusting controller links to each other with described control switch, and by controlling the electric energy after described control switch is adjusted the adjusting of described electric power converter output.
9. system according to claim 7 is characterized in that, also comprises:
AC-dc converter is used for the AC energy that described power supply provides is transformed into direct current energy, and described mains switch is between described power supply and described AC-dc converter.
10. system according to claim 7 is characterized in that, described light source is the light-emitting diode chain.
11. system according to claim 7, it is characterized in that, first group of action of described mains switch comprises that first disconnects action and first ON Action thereafter, and second group of action of described mains switch comprises that second disconnects action and second ON Action thereafter.
12. system according to claim 7 is characterized in that, described electric power converter is a DC to DC converter.
13. system according to claim 7 is characterized in that, described electric power converter comprises the inductance of connecting with described light source.
14. system according to claim 7 is characterized in that, described system also comprises:
With the energy-storage units that described light adjusting controller links to each other, being used for when described mains switch disconnects is described light adjusting controller power supply.
15. system according to claim 7, it is characterized in that, described light adjusting controller works in the pulse light modulation pattern, under this pulse light modulation pattern, described dimmer also comprises: the pulse width modulating signal generator that links to each other with described digital to analog converter, described pulse width modulating signal generator is used for producing a pulse width modulating signal to control described control switch according to described dim signal, and wherein, the duty ratio of described pulse width modulating signal is determined by described dim signal.
16. system according to claim 7, it is characterized in that, described light adjusting controller works in the simulation light-modulating mode, under this simulation light-modulating mode, described light adjusting controller also comprises: a comparator that links to each other with described dimmer, described comparator is used for more described dim signal and indication current monitoring signal of electric current of described light source of flowing through, and produces control signal to control described control switch.
17. one kind is carried out the method for controlling electric energy to light source, it is characterized in that, comprises the following steps:
Utilize the electric energy after the adjusting of electric power converter output to be light source power supply;
Trigger monitoring means and receive the light modulation request signal, this light modulation request signal indication is connected in first group of action of the mains switch between power supply and the described electric power converter;
Dimmer produces dim signal according to described light modulation request signal;
Electric energy after the described adjusting that the described dimmer control switch that control is connected with described light source according to described dim signal is exported with the described electric power converter of continuous adjustment;
When described triggering monitoring means received the light modulation termination signal, described dimmer stopped to adjust the electric energy after the described adjusting of described electric power converter output, and wherein, this light modulation termination signal is indicated second group of action of described mains switch.
18. method of light source being carried out controlling electric energy according to claim 17, it is characterized in that, first group of action of described mains switch comprises that first disconnects action and first ON Action thereafter, and second group of action of described mains switch comprises that second disconnects action and second ON Action thereafter.
19. according to claim 17 light source is carried out the method for controlling electric energy, it is characterized in that described dimmer comprises according to the step that described light modulation request signal produces dim signal:
Clocking when receiving described light modulation request signal;
With described clock signal actuation counter;
Count value according to described counter produces dim signal;
Described when described triggering monitoring means receives the light modulation termination signal, the step that described dimmer stops to adjust the electric energy after the described adjusting of described electric power converter output comprises:
Stop to produce described clock signal when receiving described light modulation termination signal.
20. according to claim 19 light source is carried out the method for controlling electric energy, it is characterized in that described dimmer comprises according to the step of the control switch that described dim signal control is connected with described light source:
Produce pulse width modulating signal;
Adjust the duty ratio of described pulse width modulating signal according to described dim signal;
Control described control switch according to described pulse width modulating signal.
21. according to claim 19 light source is carried out the method for controlling electric energy, it is characterized in that described dimmer comprises according to the step of the control switch that described dim signal control is connected with described light source:
Produce the current monitoring signal, described current monitoring signal is indicated the electric current of the described light source of flowing through;
More described dim signal and described current monitoring signal are to produce control signal;
Control described control switch according to described control signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/415,028 US8076867B2 (en) | 2008-12-12 | 2009-03-31 | Driving circuit with continuous dimming function for driving light sources |
| US12/415,028 | 2009-03-31 |
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| Publication Number | Publication Date |
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| CN101854759A CN101854759A (en) | 2010-10-06 |
| CN101854759B true CN101854759B (en) | 2011-07-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| CN102014540B (en) | 2010-03-04 | 2011-12-28 | 凹凸电子（武汉）有限公司 | Drive circuit and controller for controlling electric power of light source |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| US8760085B2 (en) * | 2009-01-14 | 2014-06-24 | Mag Instrument, Inc. | Multi-mode portable lighting device |
| CN103391006A (en) | 2012-05-11 | 2013-11-13 | 凹凸电子（武汉）有限公司 | Light source driving circuit and controller and method for controlling power converter |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| CN102387639B (en) * | 2011-02-16 | 2013-08-21 | 凹凸电子（武汉）有限公司 | Driving circuit, method and dimming controller for driving light source |
| IN2012DE00358A (en) * | 2011-03-07 | 2015-04-10 | O2Micro Inc | |
| TWI461107B (en) * | 2011-03-22 | 2014-11-11 | Richtek Technology Corp | Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof |
| CN102957312B (en) * | 2011-08-19 | 2015-02-11 | 立锜科技股份有限公司 | Power supply with over-current protection and control circuit and protection method thereof |
| CN110430642B (en) * | 2013-08-09 | 2023-11-14 | 意法半导体研发(深圳)有限公司 | Driving device for light emitting apparatus and method thereof |
| CN103605226B (en) * | 2013-11-25 | 2016-03-23 | 深圳市华星光电技术有限公司 | Backlight regulating circuit and liquid crystal indicator |
| CN104039052B (en) * | 2014-06-20 | 2016-09-28 | 陕西亚成微电子股份有限公司 | A kind of LED dimming controlling method |
| CN104053283B (en) * | 2014-06-20 | 2016-06-01 | 陕西亚成微电子股份有限公司 | A kind of LED adjusting control circuit |
| CN105992437A (en) * | 2015-02-13 | 2016-10-05 | 凹凸电子（武汉）有限公司 | Light source drive circuit and light source module |
| US9991791B2 (en) * | 2015-03-30 | 2018-06-05 | Infineon Technologies Austria Ag | System and method for a switched-mode power supply |
| US10757770B2 (en) | 2016-02-12 | 2020-08-25 | O2Micro Inc | Light source driving circuits and light source module |
| CN107071967B (en) * | 2017-03-23 | 2019-04-16 | 苏州智浦芯联电子科技股份有限公司 | A kind of LED adjusting control circuit and dimming controlling method |
| CN112788815B (en) * | 2019-11-04 | 2022-11-08 | 海信视像科技股份有限公司 | Display device and power supply circuit |
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