CN102548143A - Drive circuit, dimmer controller and method for electrically controlling light-emitting diode (LED) light source - Google Patents

Drive circuit, dimmer controller and method for electrically controlling light-emitting diode (LED) light source Download PDF

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Publication number
CN102548143A
CN102548143A CN201110447599XA CN201110447599A CN102548143A CN 102548143 A CN102548143 A CN 102548143A CN 201110447599X A CN201110447599X A CN 201110447599XA CN 201110447599 A CN201110447599 A CN 201110447599A CN 102548143 A CN102548143 A CN 102548143A
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China
Prior art keywords
signal
switch
adjusting controller
light adjusting
light
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CN201110447599XA
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Chinese (zh)
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CN102548143B (en
Inventor
阎铁生
林风
李友玲
郭清泉
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O2Micro China Co Ltd
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O2Micro China Co Ltd
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Priority to CN201110447599.XA priority Critical patent/CN102548143B/en
Priority to US13/369,620 priority patent/US9030122B2/en
Priority to IN931DE2012 priority patent/IN2012DE00931A/en
Priority to JP2012104480A priority patent/JP2013140931A/en
Publication of CN102548143A publication Critical patent/CN102548143A/en
Priority to EP12180381.1A priority patent/EP2611263A3/en
Priority to TW101141648A priority patent/TWI568309B/en
Priority to BRBR102012033492-5A priority patent/BR102012033492A2/en
Application granted granted Critical
Publication of CN102548143B publication Critical patent/CN102548143B/en
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Abstract

The invention discloses a drive circuit, a dimmer controller and a method for electrically controlling a light-emitting diode (LED) light source. The drive circuit comprises a transformer, a switch controller and a dimmer controller. The transformer comprises a primary winding which is used for receiving the input electric energy from an alternating current/direct current converter and an auxiliary winding which provides the output electric energy for the LED light source. The switch controller is connected between an optical coupler and the primary winding, and is used for receiving a feedback signal which indicates the target value of the current which passes by the LED light source, and controlling the input electric energy of the primary winding according to the feedback signal. The dimmer controller is connected with the auxiliary winding, and is used for receiving a switch monitoring signal which indicates the motion of a power switch, and adjusting the output electric energy of the transformer through adjusting the feedback signal according to the switch monitoring signal. According to he invention, the brightness of the LED light source can be controlled without using other dimming devices, and accordingly, the cost is saved.

Description

Led light source is carried out drive circuit, light adjusting controller and the method for controlling electric energy
Technical field
The present invention relates to a kind of light source driving circuit, relate in particular to a kind of drive circuit, light adjusting controller and method of led 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 at material with making.LED has high efficiency, long-life, characteristics such as bright-colored, can be applied to fields such as automobile, computer, communication, military affairs and commodity.Such as, the LED lamp can substitute traditional incandescent lamp as lighting source.
Shown in Figure 1 is a kind of sketch map 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 converts input voltage vin the VD Vout of expectation to, is used for to 106 power supplies of LED chain.The switch 104 that links to each other with electric power converter 102 is used to control opening or closing of LED lamp.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 in use, and the user can't regulate the brightness of LED.
Shown in Figure 2 is the sketch map of the traditional led drive circuit 200 of another kind.Electric power converter 102 converts input voltage vin the VD Vout of expectation to, is used for to 106 power supplies of LED chain.The switch 104 that links to each other with electric power converter 102 can be used to control opening or closing of LED lamp.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 Q3 with the mode of linearity, thereby the electric current of the LED chain 106 of flowing through can be regulated accordingly.This traditional led drive circuit 200 need utilize certain dedicated devices to regulate the brightness of LED chain 106, for example utilizes a custom-designed switch that has the switch of adjusting button or can receive remote signal, thereby causes cost to increase.
Summary of the invention
The technical problem that the present invention will solve is to provide a kind of LED source is carried out drive circuit, light adjusting controller and the method for controlling electric energy, need not use extra light modulation device just can realize the control to LED source brightness.
The invention provides a kind of drive circuit that LED source is carried out controlling electric energy.Said drive circuit comprises transformer, on-off controller and light adjusting controller.Said transformer comprises and is used to receive the secondary winding that the output electric energy is provided from the former limit winding of the input electric energy of AC/DC converter with for said LED source.On-off controller is connected between optical coupler and the said former limit winding, is used for receiving from said optical coupler the feedback signal of the desired value of the electric current of indicating the LED source of flowing through, and controls the input electric energy of said former limit winding according to said feedback signal.Light adjusting controller is connected with said secondary winding, is used to receive the switch monitor signal of the action of indicating mains switch, and regulates the output electric energy of said transformer according to said switch monitor signal through adjusting said feedback signal.Wherein said mains switch is connected between AC power and the said AC/DC converter.
The present invention also provides a kind of light adjusting controller, and it is connected with the secondary winding of transformer, is used to control the electric energy from AC/DC converter to LED source.Said light adjusting controller comprises: switch monitoring port, current monitoring port and compensation port.Said switch monitoring port is used to receive the switch monitor signal of the action of indicating mains switch, and wherein said mains switch is connected between AC power and the said AC/DC converter.Said current monitoring port is used to receive the current monitoring signal of the electric current of indicating the said LED source of flowing through.Said compensation port is used for producing compensating signal according to the action of said mains switch and said current monitoring signal and controls the control switch with the former limit windings in series of said transformer, to adjust the electric energy of said LED source.
The present invention also provides a kind of method of LED source being carried out controlling electric energy.Said method comprises: transformer provides the electric energy after the adjusting that said LED source is supplied power; Receive the feedback signal of the desired value of the electric current of indicating the said LED source of flowing through; Receive the switch monitor signal of the action of mains switch in the circuit of the former limit of indication; Produce dim signal according to said switch monitor signal; And adjust the output electric energy that said feedback signal is adjusted said transformer according to said dim signal.
Through the method that adopts drive circuit of the present invention, light adjusting controller and light source carried out controlling electric energy; The brightness that can effectively control light source changes; Especially when being coupled in mains switch between power supply and the light source when connecting; Can well avoid light-source brightness sudden change, and the brightness of light source is increased gradually, thereby more comfortable user experience is provided for the user.In addition, the present invention can regulate the brightness of light source like off action, and needn't use additional devices through the action to the common power switch, for example need not custom-designed switch with light modulation button, thereby saves cost.
Description of drawings
Below, can further understand the object of the invention, specific structural features and advantage through some embodiments of the present invention being combined the description of its accompanying drawing.
Shown in Figure 1 is a kind of circuit diagram of traditional led drive circuit;
Shown in Figure 2 is the circuit diagram of the traditional led drive circuit of another kind;
Shown in Figure 3 is the sketch map of light source driving circuit according to an embodiment of the invention;
Shown in Figure 4 is the circuit diagram of light source driving circuit according to an embodiment of the invention;
Shown in Figure 5 is the structural representation of the light adjusting controller among Fig. 4;
Shown in Figure 6 for simulating the signal waveform sketch map under the light-modulating mode;
Shown in Figure 7 is signal waveform sketch map under the pulse light modulation pattern;
Shown in Figure 8 is the operation chart of light source driving circuit according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller shown in Fig. 5;
Shown in Figure 9 for according to an embodiment of the invention light source being carried out the method flow diagram of controlling electric energy;
Shown in Figure 10 is the circuit diagram of light source driving circuit according to an embodiment of the invention;
Shown in Figure 11 is the structural representation of the light adjusting controller among Figure 10;
Figure 12-13 is depicted as the signal waveforms of light source driving circuit according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller shown in Figure 11;
Shown in Figure 14 is the circuit diagram of light source driving circuit according to an embodiment of the invention;
Shown in Figure 15 is the structural representation of the light adjusting controller among Figure 14;
Shown in Figure 16 is the signal waveforms of light source driving circuit according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller shown in Figure 15;
Shown in Figure 17 for according to an embodiment of the invention light source being carried out the method flow diagram of controlling electric energy;
Shown in Figure 180 is the sketch map of light source driving circuit according to an embodiment of the invention;
Shown in Figure 19 is the example of mains switch according to an embodiment of the invention;
Shown in Figure 20 is the circuit diagram of light source driving circuit according to an embodiment of the invention;
Shown in Figure 21 is the structural representation of the light adjusting controller among Figure 20;
Shown in Figure 22 is that light source driving circuit is at the signal waveforms of simulating under the light-modulating mode according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller shown in Figure 21;
Shown in Figure 23 is the circuit diagram of light source driving circuit according to an embodiment of the invention;
Shown in Figure 24 is the structural representation of the light adjusting controller among Figure 23;
Shown in Figure 25 is the signal waveforms of light source driving circuit under the pulse light modulation pattern according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller shown in Figure 24;
Shown in Figure 26 for according to an embodiment of the invention light source being carried out the method flow diagram of controlling electric energy.
Embodiment
Below will provide detailed reference to embodiments of the invention.Although the present invention sets forth through these execution modes and explains, 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 accompanying claims 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 instance, describe in detail for method, formality, element and the circuit of known, so that highlight purport of the present invention.
Shown in Figure 3 is the sketch map 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 the AC-input voltage Vin from power supply is converted into VD Vout; 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 electric power converter 310 and to be used to receive the switch monitor signal of indication mains switch 304 actions; According to the light adjusting controller 308 of these 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 can be the mains switch that places on the metope.Through the handle on the diverter switch, the user can control the conducting state of mains switch 304.Figure 19 shows the example of mains switch 304 according to an embodiment of the invention.
In operation, AC/DC converter 306 converts input ac voltage Vin into VD Vout.Electric power converter 310 receives direct voltage Vout and is the voltage after LED chain 312 provides adjusting.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 through the reference signal of regulating a decision LED lowest high-current value.In another embodiment, light adjusting controller 308 works in pulse light modulation (burst dimming) pattern, recently regulates the electric energy of LED chain 312 through the duty of regulating a pulse width modulating signal (pwm signal).Through regulating the electric energy of LED chain 312, the brightness of LED chain 312 can access accordingly and regulate.
Shown in Figure 4 is the circuit diagram of light source driving circuit 400 according to an embodiment of the invention.Fig. 4 will combine Fig. 3 to describe.Parts identical with Fig. 3 label among Fig. 4 have similar function, are not repeated in this description for not doing at this for simplicity.
Light source driving circuit 400 comprises the electric power converter 310 that is connected between power supply and the LED chain 312, and the electric energy that is used to receive from power supply also is the electric energy after LED chain 312 provides adjusting.In the embodiment of Fig. 4, electric power converter 310 is the step-down controllers that comprise inductance L 1, 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 outputs.The action of this switch monitor signal indication 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 the embodiment shown in fig. 4, AC/DC converter 306 is the bridge rectifiers that comprise diode D1, D2, D7, D8, 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 through resistance R 3, is used to control the conducting state of the switch Q27 that links to each other with LED chain 312, for example, and the state of the on/off of switch Q27.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 port SEL is connected to ground through resistance R 4, and is as shown in Figure 4, perhaps port SEL is directly connected to ground, can correspondingly select to simulate light-modulating mode or pulse light modulation pattern.
Port CLK is connected to AC/DC converter 306 through resistance R 3, is connected to ground through 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 parallelly connected with resistance R 6, is used for the unnecessary noise of filtering.Port RT links to each other with ground through resistance R 7, is used for confirming the frequency by the pulse signal of light adjusting controller 308 generations.
Port VDD links to each other with switch Q27 through diode D9, is used to light adjusting controller 308 power supplies.In one embodiment, an energy-storage units is connected between port VDD and the ground like capacitor C 10, is light adjusting controller 308 power supplies when mains switch 304 breaks off.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 through current monitoring resistance R 5.Light adjusting controller 308 is through the conducting state of the control signal control switch Q16 that on port CTRL, exports, with the electric energy after the adjusting of adjustment 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 through control switch Q16.
In operation, when mains switch 304 was connected, AC/DC converter 306 converted the alternating voltage Vin of input into VD Vout.The voltage that has the predeterminated voltage value on the port HV_GATE puts on the switch Q27 through 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.Electric current is flowed through inductance L 1, LED chain 312, switch Q27, switch Q16 and resistance R 5 to ground.If light adjusting controller 308 cut-off switch Q16, then flow through inductance L 1, LED chain 312 and diode D4 of electric current.Inductance L 1 discharge is to give the LED chain 312 power supplies.Therefore, light adjusting controller 308 is through control switch Q16, can adjust the electric energy after the adjusting of electric power converter 310 outputs.
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.And if 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.
Shown in Figure 5 is the structural representation of the light adjusting controller 308 among Fig. 4.Fig. 5 will combine Fig. 4 to describe.Parts identical with Fig. 4 label among Fig. 5 have similar function, are not repeated in this description for not doing at this for simplicity.
Light adjusting controller 308 comprises triggering monitoring means 506, dimmer 502 and pulse signal producer 504.Trigger monitoring means 506 and be connected to ground through Zener diode ZD1.Trigger monitoring means 506 through port CLK receiving key monitor signal, the action of this switch monitor signal indication external power switch 304.When the action of external power switch 304 is monitored to, triggers monitoring means 506 and produce drive signal with actuation counter 526.Trigger the conducting state of the also further control switch Q27 of monitoring means 506.Dimmer 502 produces reference signal REF, regulates the electric energy of LED chain 312 with the mode of simulation light modulation.Dimmer 502 also can produce control signal 538, recently adjusts the electric energy of LED chain 312 through the duty of regulating impulse bandwidth modulation signals PWM1.Pulse signal producer 504 produces pulse signal and is used to connect switch Q16.Light adjusting controller 308 also comprises startup and low pressure locking (UVL) circuit 508 that links to each other with port VDD, is used for optionally starting according to different electric energy situation one or more parts of light adjusting controller 308 inside.
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 breaks off, if the voltage on the port VDD is lower than second predeterminated voltage, startup and low pressure lock-in circuit 508 will be closed in the light adjusting controller 308 except triggering monitoring means 506 and the miscellaneous part the dimmer 502 to save electric energy.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 parts all in the light adjusting controller 308.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 breaks off, trigger monitoring means 506 and can also work a period of time with dimmer 502.
In light adjusting controller 308, port SEL links to each other with current source 532.The user can select light-modulating mode through configured port SEL, for example, port SEL is directly linked to each other with ground, or port SEL is linked to each other with ground through a resistance.In one embodiment, light-modulating mode decides through 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.In this case, a control circuit (not shown among Fig. 5) is connected switch 540, cut-off switch 541 and switch 542, thus light adjusting controller 308 can work in the simulation light-modulating mode, and adjust the electric energy of LED chain 312 through adjustment reference signal REF.In another embodiment, if port SEL is connected to ground (as shown in Figure 4) through resistance R 4, the voltage on the port SEL is greater than 0 so.This control circuit cut-off switch 540 connect switch 541 and switch 542, thereby light adjusting controller 308 works in the pulse light modulation pattern, and recently adjusts the electric energy of LED chain 312 through the duty of adjustment pulse width modulating signal PWM1.In other words, through control switch 540, switch 541, the conducting state of switch 542 can be selected different light-modulating modes.And switch 540, switch 541, the conducting state of switch 542 is determined by the voltage on the port SEL.
Pulse signal producer 504 is connected to ground through port RT and resistance R 7, produces the pulse signal 536 that is used to connect switch Q16.Pulse signal producer 504 can have various structure, 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 end of oppisite phase voltage of operational amplifier 510 also is V1.Electric current I RTFlow to ground through port RT and resistance R 7.The flow through electric current I of mos field effect transistor (MOSFET) 514 and mos field effect transistor 515 1With electric current I RTHas same size.Mos field effect transistor 514 constitutes current mirror with mos field effect transistor 512, the electric current I of the mos field effect transistor 512 of therefore flowing through 2Also with electric current I RTHas identical size.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 end of oppisite phase of comparator 516 receives predeterminated voltage V2.The in-phase end of comparator 518 receives predeterminated voltage V3.In one embodiment, V2 is greater than V3, and V3 is 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 end of oppisite phase.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 parallelly connected 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 in electric current I 2Down charging of effect, so the voltage at capacitor C 4 two ends raises.When the C4 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 through 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 in electric current I 2Effect under charge again.As previously mentioned, 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 through 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 (as 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, when an off action when port CLK is monitored to, trigger monitoring means 506 and produce drive signals.
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 through resistance R 3, thereby connects switch Q27.Thereby trigger monitoring means 506 and can the voltage of port HV_GATE be pulled down to 0 cut-off switch Q27.In one embodiment, on port CLK, monitor the off action of mains switch 304, trigger monitoring means 506 with regard to cut-off switch Q27.On port CLK, monitor the connection 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 breaks off, 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 under the effect of this drive signal.For example add 1.Digital to analog converter 528 reads count value from counter 526, and produces dim signal according to count value, and for example this dim signal can be control signal 538 or reference signal REF.Dim signal can be used for adjusting the target energy value of electric power converter 310, thus the brightness of adjustment LED chain 312.
Under the pulse light modulation pattern, switch 540 breaks off, and switch 541 is connected with switch 542.The end of oppisite phase of comparator 534 receives reference signal REF1.Reference signal REF1 is the direct current signal with predeterminated voltage value.The voltage of reference signal REF1 has determined the lowest high-current value 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, can adjust the duty ratio of pulse width modulating signal PWM1.Through the duty ratio of adjustment PWM1, make the brightness of LED chain 312 be equal to or less than the high-high brightness of reference signal REF1 decision.For example, 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 breaks off with switch 542.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 according to the voltage of the count value adjustment reference signal REF of counter 526.The voltage of reference signal REF has determined the lowest high-current value of LED chain 312, thereby has also determined the high-high brightness of LED chain 312.Therefore, through adjustment reference signal 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 reference signal REF.For example, if count value is 0, then the voltage of digital to analog converter 528 adjustment reference signal REF is V4.Monitor the off action of mains switch 304 if trigger monitoring means 506 at port CLK, thereby make count value be increased to 1, then the voltage of digital to analog converter 528 adjustment reference signal 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 reference signal 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 two digit counters, count value will be increased to 1,2,3 successively since 0, behind the 4th opening operation, get back to 0 then.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 end of oppisite phase of comparator 534 can optionally receive reference signal REF or reference signal REF1.Under the simulation light-modulating mode, the end of oppisite phase of comparator 534 receives reference signal REF through switch 540.Under the pulse light modulation pattern, the end of oppisite phase of comparator 534 receives reference signal REF1 through switch 541.The in-phase end of comparator 534 links to each other with current monitoring resistance R 5 through port MON, to receive the current monitoring signal SEN from current monitoring resistance R 5.The voltage of current monitoring signal SEN is represented the size of current of the LED chain 312 of when switch Q27 and switch Q16 connection, flowing through.
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, through port CTRL control switch Q16.
If selected the simulation light-modulating mode, switch 540 is connected, and switch 541 breaks off with switch 542.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.Electric current is flowed through inductance L 1, LED chain 312, switch Q27, switch Q16, current monitoring resistance R 5 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 break off.After switch Q16 broke off, inductance L 1 discharge was to supply power to LED chain 312.The electric current of the inductance L of flowing through 1, 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 through current monitoring resistance R 5.When the voltage of the current monitoring signal SEN voltage greater than reference signal REF, switch Q16 is broken off by set-reset flip-floop 522 once more.As stated, 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.Therefore, through adjustment reference signal REF, the brightness of LED chain 312 is able to correspondingly adjust.
Under the simulation light-modulating mode, when triggering monitoring means 506 when port CLK monitors the off action of mains switch 304, the count value of counter 526 adds 1.The off 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 that the voltage of reference signal REF is adjusted to second magnitude of voltage from first magnitude of voltage.Therefore, when mains switch 304 was connected once more, the brightness of LED chain 312 was able to adjustment because of the adjustment of reference signal REF.
If the strobe pulse light-modulating mode, switch 540 breaks off, and switch 541 is connected with switch 524.The end of oppisite phase 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 through 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 broke off.Through the duty ratio of adjustment 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, the opening operation of mains switch 304 monitors at the port CLK monitoring means 506 that is triggered.Triggering monitoring means 506 breaks off Q27 and produces drive signal.Under the effect of this drive signal, the count value of counter 526 increases, and for example adds 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 by reference signal REF1 and pulse width modulating signal PWM1 jointly.
Shown in Figure 6 for simulating the signal waveform sketch map under the 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 combine Fig. 4 and Fig. 5 to describe.
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, the R input of comparator 534 output digital signal 1 to set-reset flip-floops 522 makes set-reset flip-floop 522 at Q output output digital signaling zero.Set-reset flip-floop 522 can make switch Q16 break off 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, through adjustment 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 adjustment.
Shown in Figure 7 is signal waveform sketch map 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 combine Fig. 4 and Fig. 5 to describe.
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 with Fig. 6.When PWM1 is digital signaling zero, becomes digital signaling zero with the output of door 524, thereby make switch Q16 break off 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, through the duty ratio of adjustment 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 adjustment.
Shown in Figure 8 is the implementation sketch map of light source driving circuit according to an embodiment of the invention.Fig. 8 will combine Fig. 5 to describe.
In embodiment shown in Figure 8, whenever triggering the off 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 lowest high-current value Imax of LED chain 312, 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, for example turns down 25% at every turn.Counter 526 is reaching maximum count value, for example is reset after 3.
Shown in Figure 9 for according to an embodiment of the invention light source being carried out the method flow diagram of controlling electric energy.Fig. 9 will combine Fig. 4 and Fig. 5 to describe.
In step 902, electric power converter, for example the electric energy after the adjusting that provides of electric power converter 310 is to light source, and for example LED chain 312 is supplied power.
In step 904, the receiving key monitor signal for example receives this switch monitor signal by light adjusting controller 308.The mains switch of this switch monitor signal indication between power supply and electric power converter, the for example action of mains switch 304.
In step 906, produce dim signal according to the switch monitor signal.
In step 908, the switch that control is connected with light source according to said dim signal, switch Q16 for example is to adjust the electric energy after the adjusting that electric power converter provides.
Adopt among the embodiment that simulates light-modulating mode at one, adjust electric power converter with the current monitoring signal of representing the source current size through comparing dim signal.Adopt among the embodiment of pulse light modulation pattern at another, through recently adjusting electric power converter with the duty of a pulse width modulating signal of said dim signal control.
As previously mentioned, the present invention has disclosed a kind of light source driving circuit, and this light source driving circuit is according to the indication mains switch, and the switch monitor signal of for example fixing mains switch action is on the wall adjusted the electric energy of light source.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 through control.
The user can be through the action to a common low-cost mains switch, and for example off action is regulated the brightness of light source, and needn't be used additional devices, for example custom-designed switch with light modulation button, thus save cost.
Shown in Figure 10 is the circuit diagram of light source driving circuit 1000 according to an embodiment of the invention.Parts identical with Fig. 4 label among Figure 10 have similar function.In structure shown in figure 10, if the mains switch 304 that is coupled between power supply and the light source driving circuit 1000 is connected, light source driving circuit 1000 increases light source gradually, for example the brightness of LED chain 312.
In one embodiment, light source driving circuit 1000 comprises electric power converter 310 and light adjusting controller 1008.Electric power converter 310 and power supply and 312 couplings of LED chain.The electric energy that electric power converter 310 receives power supply to be provided also is the electric energy after LED chain 312 provides adjusting.In the embodiment of Figure 10, electric power converter 310 is the step-down controllers that comprise inductance L 1, diode D4 and control switch Q16.In Figure 10, control switch Q16 can be positioned at light adjusting controller 1008 outsides.In other embodiments, control switch Q16 also can be integrated in light adjusting controller 1008 inside.Light adjusting controller 1008 is through the electric energy of the control switch Q16 that connects with LED chain 312 of control after with the adjusting of adjusting electric power converter 310 and providing.In one embodiment; Light adjusting controller 1008 is the flow through electric current of LED chain 312 of adjustment according to ramp signal, makes that the average current of LED chain 312 increases to preset value gradually when mains switch 304 connections that are coupled between power supply and the light source driving circuit 1000.
Light source driving circuit 1000 also comprises the AC/DC converter 306 that is used for AC-input voltage Vin is converted into VD Vout, and monitoring stream is through the current monitor 314 of LED chain 312 electric currents.In the embodiment of Figure 10, AC/DC converter 306 is the bridge rectifiers that are made up of diode D1, D2, D7, D8, D10 and capacitor C 9.Current monitor 314 comprises current monitoring resistance R 5.
In the embodiment of Figure 10, light adjusting controller 1008 has port HV_GATE, SST, LCT, RT, VDD, CTRL, MON and GND.Port HV_GATE is used for the conducting state of control switch Q27 through resistance R 3 and switch Q27 coupling.Capacitor C 11 is coupled between port HV_GATE and the ground, and Q27 provides grid voltage for switch.Port SST is used to receive ramp signal through capacitor C 20 and ground coupling.Port LCT is through capacitor C 12 and ground coupling.Port RT is through resistance R 7 and ground coupling, the frequency of the pulse signal that is used to determine that light adjusting controller 1008 produces.Port VDD is light adjusting controller 1008 power supplies through diode D9 and switch Q27 coupling.In one embodiment, be coupled in the energy-storage units between port VDD and the ground, for example capacitor C 10, are light adjusting controller 1008 power supplies when mains switch 304 breaks off.In another embodiment, energy-storage units is integrated in light adjusting controller 1008 inside.Port GND links to each other with ground.
Port CTRL and control switch Q16 coupling.Control switch Q16 connects with LED chain 312, switch Q27 and current monitoring resistance R 5.Electric energy after the adjusting that the conducting state of this control switch of control signal control Q16 of light adjusting controller 1008 through utilizing port CTRL output provides with adjustment electric power converter 310.Port MON and 5 couplings of current monitoring resistance R receive the current monitoring signal of indicating LED chain 312 electric currents of flowing through.When switch Q27 connection, light adjusting controller 1008 is adjusted the electric current of the LED chain 312 of flowing through through control control switch Q16.
Connect when mains switch 304, AC/DC converter 306 converts AC-input voltage Vin into VD Vout.Thereby the predeterminated voltage on the port HV_GATE puts on switch Q27 through resistance R 3 and connects switch Q27.If light adjusting controller 1008 is connected control switch Q16, direct voltage Vout is LED chain 312 power supplies and to inductance L 1 charging.Electric current is flowed through inductance L 1, LED chain 312, switch Q27, control switch Q16, current monitoring resistance R 5 to ground.Inductance L 1, LED chain 312 and diode D4 if light adjusting controller 1008 disconnection control switch Q16, electric current flow through.Inductance L 1 discharge is 312 power supplies of LED chain.Therefore, light adjusting controller 1008 is through control control switch Q16, the electric energy of adjustment electric power converter 310.
Shown in Figure 11 is the structural representation of the light adjusting controller 1008 among Figure 10.The parts identical with label among Fig. 5 have similar function.
In the embodiment of Figure 11, light adjusting controller 1008 comprises pulse signal producer 504, pulse width modulating signal generator 1108 and startup and low pressure lock-in circuit 508.Startup and low pressure lock-in circuit 508 optionally start one or more parts of light adjusting controller 1008 inside according to light adjusting controller 1008 different electric energy situation.Pulse signal producer 504 produces pulse signal to connect control switch Q16.Pulse width modulating signal generator 1108 produces pulse width modulating signal PWM2.In one embodiment; Pulse width modulating signal generator 1108 comprises the sawtooth signal generator 1102 that is used to produce sawtooth signal SAW, the power supply 1104 that is used to produce ramp signal RAMP1, and sawtooth signal SAW and ramp signal RAMP1 are compared to produce the comparator 1106 of pulse width modulating signal PWM2.
Pulse signal producer 504 produces the pulse signal 536 that comprises a series of pulses at the Q of set-reset flip-floop 520 output.Pulse signal 536 is transferred into the S input of set-reset flip-floop 522.The end of oppisite phase of comparator 534 receives reference signal REF2.Reference signal REF2 is the direct current signal with predeterminated voltage value.In the embodiment of Figure 11, the voltage of REF2 has determined the lowest high-current value of LED chain 312, thereby has also determined the high-high brightness of LED chain 312.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 PWM2 that pulse width modulating signal generator 1108 produces is sent to and door 524.With door 524 output control signals, through port CTRL control Q16.In one embodiment, when pulse width modulating signal PWM2 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 PWM2 was digital signaling zero, switch Q16 broke off.Through the duty ratio of adjustment pulse width modulating signal PWM2, can adjust the electric energy of LED chain 312 accordingly.So reference signal REF2 and pulse width modulating signal PWM2 determine the brightness of LED chain 312 jointly.
Figure 12,13 is depicted as the signal waveforms of light source driving circuit according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller 1008 shown in Figure 11.Figure 12 shows the waveform of sawtooth signal SAW, ramp signal RAMP1 and pulse width modulating signal PWM2.Figure 13 shows the output V522, the output V524 with door 524, conducting state and the pulse width modulating signal PWM2 of control switch Q16 of electric current 602, pulse signal 536, the set-reset flip-floop 522 of the LED chain 312 of flowing through.Figure 12 and Figure 13 will combine Figure 10 and Figure 11 to describe.
Connect when mains switch 304, light adjusting controller 1008 receives electric energy through port VDD.If the voltage of port VDD greater than the predeterminated voltage value, starts and low pressure lock-in circuit 508 starts power supply 1104, be capacitor C 20 chargings through port SST.The voltage at capacitor C 20 two ends (also being ramp signal RAMP1) increases gradually, and is shown in figure 12.Sawtooth signal generator 1102 produces sawtooth signal SAW.Comparator 1106 comparison ramp signal RAMP1 and sawtooth signal SAW are to produce pulse width modulating signal PWM2.Therefore, if mains switch 304 is connected, the duty ratio of pulse width modulating signal PWM2 is along with the voltage of ramp signal RAMP1 increases and increases, and is shown in figure 12.
Pulse signal producer 504 produces pulse signal 536.Under the effect of each pulse, set-reset flip-floop 522 produces digital signal 1 at the Q output in pulse signal 536.If pulse width modulating signal PWM2 is a digital signal 1, set-reset flip-floop 522 produces digital signal 1 at the Q output makes control switch Q16 connect, and the electric current of the inductance L of flowing through 1 increases, and LED electric current 602 increases.When LED electric current 602 increases to maximum Imax; Explain that the voltage of current monitoring signal SEN increases to the voltage of reference signal REF2; 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 break off.After switch Q16 broke off, inductance L 1 discharge was to supply power to LED chain 312, and LED electric current 602 reduces gradually.If pulse width modulating signal PWM2 is a digital signaling zero, be output as digital signaling zero with door 524, control switch Q16 breaks off, and LED electric current 602 reduces gradually.If pulse width modulating signal PWM2 keeps the state long enough of digital signaling zero, electric current 602 can be reduced to 0.Therefore, if pulse width modulating signal PWM2 is first state, for example digital signal 1, and light adjusting controller 1008 is connection control switch Q16 under the effect of pulse signal 536, and when LED electric current 602 increases to maximum Imax, breaks off control switch Q16.If pulse width modulating signal PWM2 is second state, digital signaling zero for example, light adjusting controller 1008 retentive control switch Q16 break off.As previously mentioned, the duty ratio of pulse width modulating signal PWM2 has determined the average current of LED chain 312.Shown in figure 12, if mains switch 304 is connected, the duty ratio of pulse width modulating signal PWM2 increases along with the voltage of ramp signal RAMP1 and increases up to duty ratio gradually and increase to 100%.Therefore, the average current of LED chain 312 increases gradually, thereby the brightness of LED chain 312 also increases gradually.
Shown in Figure 14 is the circuit diagram of light source driving circuit 1400 according to an embodiment of the invention.Parts identical with Figure 10 label among Figure 14 have similar function.If the mains switch 304 that is coupled between power supply and the light source driving circuit 1400 is connected, light source driving circuit 1400 increases the brightness of light source gradually.
In one embodiment, light source driving circuit 1400 comprises electric power converter 310 and light adjusting controller 1408.Electric power converter 310 and power supply and 312 couplings of LED chain.The electric energy that electric power converter 310 receives power supply to be provided also is the electric energy after LED chain 312 provides adjusting.In the embodiment of Figure 14, electric power converter 310 is the step-down controllers that comprise inductance L 1, diode D4 and control switch Q16.In Figure 10, control switch Q16 can be positioned at light adjusting controller 1408 outsides.In other embodiments, control switch Q16 also can be integrated in light adjusting controller 1408 inside.Electric energy after the adjusting that the control switch Q16 adjustment electric power converter 310 that light adjusting controller 1408 is connected with LED chain 312 through control provides.In one embodiment; Light adjusting controller 1408 is the flow through electric current of LED chain 312 of adjustment according to ramp signal, makes that the average current of LED chain 312 increases to preset value gradually when mains switch 304 connections that are coupled between power supply and the light source driving circuit 1400.
Light source driving circuit 1400 also comprises the AC/DC converter 306 that is used for AC-input voltage Vin is converted into VD Vout, and monitoring stream is through the current monitor 314 of LED chain 312 electric currents.In the embodiment of Figure 14, AC/DC converter 306 is the bridge rectifiers that are made up of diode D1, D2, D7, D8, D10 and capacitor C 9.Current monitor 314 comprises current monitoring resistance R 5.
In the embodiment of Figure 14, light adjusting controller 1408 has port HV_GATE, VREF, ADJ, RT, VDD, CTRL, MON and GND.Port HV_GATE is used for the conducting state of control switch Q27 through resistance R 3 and switch Q27 coupling.Capacitor C 11 is coupled between port HV_GATE and the ground, and Q27 provides grid voltage for switch.Port VREF is through resistance R 20 and energy-storage units, and for example capacitor C 14 is coupled with ground.It is that capacitor C 14 chargings are to produce ramp signal RAMP2 that port VREF provides direct voltage.Port ADJ and capacitor C 14 couplings receive ramp signal RAMP2.Port RT is through resistance R 7 and ground coupling, the frequency of the pulse signal that is used to determine that light adjusting controller 1408 produces.Port VDD is light adjusting controller 1408 power supplies through diode D9 and switch Q27 coupling.In one embodiment, be coupled in the energy-storage units between port VDD and the ground, for example capacitor C 10 is light adjusting controller 1408 power supplies when mains switch 304 breaks off.In another embodiment, energy-storage units is integrated in light adjusting controller 1408 inside.Port GND links to each other with ground.Light adjusting controller 1408 is through the electric energy of control control switch Q16 adjustment electric power converter 310.
Shown in Figure 15 is the structural representation of the light adjusting controller 1408 among Figure 14.Parts identical with Figure 11 label among Figure 15 have similar function.Figure 15 will combine Figure 14 to describe.
In the embodiment of Figure 15, light adjusting controller 1408 comprises pulse signal producer 504, startup and low pressure lock-in circuit 508 and comparator 1534.Startup and low pressure lock-in circuit 508 optionally start one or more parts of light adjusting controller 1408 inside according to light adjusting controller 1408 different electric energy situation.In the embodiment of Figure 15, startup and low pressure lock-in circuit 508 comprise the reference voltage generator 1505 that is used for providing at port VREF direct voltage.Pulse signal producer 504 produces pulse signal, is used to connect control switch Q16.The current monitoring signal SEN that ramp signal RAMP2 that comparator 1534 receives port ADJ and current monitoring resistance R 5 provide compares.Ramp signal RAMP2 is transferred into the end of oppisite phase of comparator 1106.Current monitoring signal SEN is transferred into the in-phase end of comparator 1106.The voltage of current monitoring signal SEN is represented the size of current of the LED chain 312 of when switch Q27 and switch Q16 connection, flowing through.In the embodiment of Figure 15, the voltage of ramp signal RAMP2 has determined the lowest high-current value Imax of LED chain 312.Zener diode ZD2 is coupled between port ADJ and the ground, to the voltage clamp of ramp signal RAMP2.
Shown in Figure 16 is the signal waveforms of light source driving circuit according to an embodiment of the invention, and this light source driving circuit includes the light adjusting controller 1408 shown in Figure 15.Figure 16 shows electric current 602, pulse signal 536, the output V522 of set-reset flip-floop 522 and the conducting state of control switch Q16 of the LED chain 312 of flowing through.Figure 16 will combine Figure 14 and Figure 15 to describe.
Pulse signal producer 504 produces pulse signal 536.Under the effect of each pulse, set-reset flip-floop 522 produces digital signal 1 at the Q output in pulse signal 536.Set-reset flip-floop 522 produces digital signal 1 at the Q output makes control switch Q16 connect, and the electric current of the inductance L of flowing through 1 increases, and LED electric current 602 increases.When LED electric current 602 increases to maximum Imax; Explain that the voltage of current monitoring signal SEN increases to the voltage of ramp signal RAMP2; Comparator 1534 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 break off.After switch Q16 broke off, inductance L 1 discharge was to 312 power supplies of LED chain, and LED electric current 602 reduces gradually.Through the voltage of adjustment ramp signal RAMP2, the average current and the brightness of LED chain 312 are also adjusted accordingly.
Connect when mains switch 304, light adjusting controller 1408 receives electric energy through port VDD.If the voltage of port VDD is greater than the predeterminated voltage value, light adjusting controller 1408 is at port VREF output dc voltage.Capacitor C 14 is charged under the effect of this direct voltage, and the voltage at its two ends (being ramp signal RAMP2) increases.Therefore, if mains switch 304 is connected, the maximum Imax of LED electric current increases to preset maximum value gradually, and the average current of LED chain 312 also increases gradually.
Shown in Figure 17 for according to an embodiment of the invention light source being carried out the method flow diagram 1700 of controlling electric energy.Figure 17 will combine Figure 10 and Figure 14 to describe.
In step 1702, utilize electric power converter, for example electric power converter 310, and the electric energy after the adjusting that provides is to light source, and for example LED chain 312 is supplied power.
In step 1704, if be coupled in the mains switch between power supply and the electric power converter 310, for example mains switch 304 is connected, and then increases the voltage of ramp signal.
In step 1706, along with the voltage increase of ramp signal, increase the average current of light source, increase to preset value up to average current.
In one embodiment, through relatively ramp signal and sawtooth signal produce pulse width modulating signal.The duty ratio of this pulse width modulating signal is by the voltage decision of ramp signal.The control switch that the control of this pulse width modulating signal is connected with light source, control switch Q16 for example, thus adjust the average current of light source.Produce pulse signal in addition.If this pulse width modulating signal is first state, control switch is connected under the effect of pulse signal, when indication flow through the current monitoring signal of electric current of light source when increasing to reference signal control switch break off.The lowest high-current value of this reference signal decision light source.If this pulse width modulating signal is second state, then control switch breaks off.
In another embodiment, the lowest high-current value of ramp signal decision light source.The current monitoring signal of electric current through light source that ramp signal and indication are flowed through compares producing control signal, and utilizes this control signal control control switch.Produce pulse signal in addition.Control switch is connected under the effect of pulse signal, and control switch breaks off when the current monitoring signal increases to ramp signal.
As previously mentioned, the present invention has disclosed a kind of light source driving circuit.If the mains switch that is coupled between power supply and this light source driving circuit is connected, this light source driving circuit increases the brightness of light source gradually, thereby avoids jump in brightness, for the user provides more comfortable user experience.
Shown in Figure 180 is the sketch map of light source driving circuit 1800 according to an embodiment of the invention.In one embodiment, light source driving circuit 1800 adopts the isolated DC/direct current transducer 1807 that comprises transformer 1808.Transformer 1808 comprises the isolation between the secondary circuit that former limit winding and secondary winding realize being coupled in the former limit circuit of former limit winding and being coupled in the secondary winding, thereby suppresses the high-frequency electromagnetic noise.In one embodiment, the mains switch 1804 that is coupled between AC power 1802 and the light source driving circuit 1800 is used for optionally being switched on or switched off the connection between AC power 1802 and the light source driving circuit 1800.Figure 19 shows the example of mains switch 1804 according to an embodiment of the invention.In one embodiment, mains switch 1804 can be the mains switch that places on the metope.Place the handle 1980 of the mains switch on the metope through switching, the user can control the conducting state of mains switch 1804, for example breaks off or the energized switch.
Please refer again to Figure 18, light source driving circuit 1800 also comprises AC/DC converter 1806, on-off controller 1810, current detector 1814, light adjusting controller 1816 and optical coupler 1818.AC/DC converter 1806 will be from the input ac voltage V that exchanges power supply 1802 INConvert direct voltage V into DCIsolated DC/direct current transducer 1807 is coupled in AC/DC converter 1806 and light source, and for example the LED chain 1812, between.Isolated DC/direct current transducer 1807 receives direct voltage V DCAnd be the output voltage V after LED chain 1812 provides adjusting OUTOn-off controller 1810 is coupled between the former limit winding of optical coupler 1818 and transformer 1808.On-off controller 1810 receives the electric current I of indicating the LED chain 1812 of flowing through from optical coupler 1818 LEDThe feedback signal CFB of desired value, and control the input electric energy of former limit winding according to feedback signal CFB.Above-mentioned electric current I LEDDesired value represent electric current I LEDThe desired value that reaches after adjustment.Specifically, on-off controller 1810 produces drive signal DRV according to feedback signal CFB.Drive signal DRV controls the input electric energy of former limit winding, thereby regulates the output voltage V of isolated DC/direct current transducer 1807 OUTCurrent detector 1814 produces the electric current I of indicating the LED chain 1812 of flowing through LEDCurrent monitoring signal SEN.Light adjusting controller 1816 is coupled between the secondary winding of optical coupler 1818 and transformer 1808.Light adjusting controller 1816 receives 1804 actions of indication mains switches, off action for example, switch monitor signal TS, and the output voltage V of regulating isolated DC/direct current transducer 1807 through adjustment feedback signal CFB according to switch monitor signal TS OUT
In one embodiment, light adjusting controller 1816 works in the simulation light-modulating mode, regulates the electric energy of LED chain 1812 through the size of adjustment reference signal.This reference signal is indicated the electric current I of the LED chain 1812 of flowing through LEDThe desired value of mean value.In another embodiment, light adjusting controller 1816 works in the pulse light modulation pattern, recently adjusts the electric energy of LED chain 1812 through the duty of adjusting a pulse width modulating signal (being pwm signal).Through the electric energy of adjustment LED chain 1812, the brightness of LED chain 1812 can access adjustment accordingly.
Shown in Figure 20 is the circuit diagram of light source driving circuit 2000 according to an embodiment of the invention.Figure 20 will combine Figure 18 to describe.Parts identical with Figure 18 label among Figure 20 have similar function, are not repeated in this description for not doing at this for simplicity.
In the embodiment shown in Figure 20, AC/DC converter 1806 comprises rectifier and capacitor C 1.Rectifier can be the bridge rectifier that comprises diode D1, diode D2, diode D7 and diode D8.Current detector 1814 comprises current sense resistance R 5.
Isolated DC/direct current transducer 1807 receives the input electric energy from AC/DC converter 1806, and is light source, and for example the LED chain 1812, and the output voltage V after the adjusting is provided OUTIn the embodiment shown in Figure 20, isolated DC/direct current transducer 1807 comprises transformer 1808, control switch Q1, diode D4 and capacitor C 6.Transformer 1808 comprises the former limit winding 2004 that is used to receive from the input electric energy of AC/DC converter 1806, is used to secondary winding 2006 and magnetic core 2024 that LED chain 1812 provides the output electric energy.Transformer 1808 also comprises and is used to the auxiliary winding 2008 that on-off controller 1810 provides electric energy.For the purpose of illustration, three windings have been illustrated in the embodiment shown in Figure 20.Yet transformer 1808 can comprise the winding of varying number.In the embodiment shown in Figure 20, the control switch Q1 that is coupled in former limit winding 2004 is positioned at the outside of on-off controller 1810.In other embodiment, control switch Q1 also can be integrated in the inside of on-off controller 1810.
On-off controller 1810 is coupled in the former limit winding 2004 and auxiliary winding 2008 of transformer 1808.On-off controller 1810 can be the anti-PWM controller that swashs, and is used to produce pwm signal and comes optionally to connect the control switch Q1 that connects with former limit winding 2004, and be used for recently adjusting through the duty of adjustment pwm signal the output electric energy of transformer 1808.For example and and unrestricted, the port of on-off controller 1810 comprises: FB, GATE, CS, RT, VDD and GND.Port FB is used for receiving the electric current I of indicating the LED chain 1812 of flowing through from optical coupler 1818 LEDThe feedback signal CFB of desired value.For instance, optical coupler 1818 comprises LED 2016 and phototransistor 2012.Port FB is from phototransistor 2012 receiving feedback signals CFB.
Port CS receives the monitor signal LPSEN of the electric current of indicating the former limit winding 2004 of flowing through.On-off controller 1810 receiving feedback signals CFB and monitor signal LPSEN, and generation drive signal DRV controls control switch Q1 on port GATE, thus regulate the output voltage V of isolated DC/direct current transducer 1807 OUTIn one embodiment, drive signal DRV is a pwm signal.Port RT is used to determine the frequency of drive signal DRV.
According to feedback signal CFB and monitor signal LPSEN, the conducting state that port GATE provides drive signal DRV to control control switch Q1, for example on/off state.Specifically, in one embodiment, when the voltage of monitor signal LPSEN during greater than the voltage of feedback signal CFB, expression is flowed through the electric current of former limit winding 2004 greater than the electric current I of the LED chain 1812 of flowing through LEDDesired value, on-off controller 1810 reduces the duty ratio of drive signal DRV, vice versa.In one embodiment, if drive signal DRV is first state, logic high for example, then control switch Q1 connects, electric current flow through former limit winding 2004 and magnetic core 2024 beginning energy storage.If drive signal DRV is second state; Logic low for example; Then control switch Q1 breaks off; And be coupled in the diode D4 forward bias of secondary winding 2006, thereby the electric energy and the brightness of adjustment LED chain 1812 so that the energy that is stored in the magnetic core 2024 is released into capacitor C 6 and LED chain 1812 through secondary winding 2006.
Port VDD is coupled to AC/DC converter 1806 and auxiliary winding 2008.In one embodiment, energy-storage units like capacitor C 5, is connected between port VDD and the ground.Energy-storage units is on-off controller 1810 power supplies when mains switch 1804 breaks off.Port GND links to each other with ground.
Light adjusting controller 1816 is coupled in the secondary winding 2006 of transformer 1808; Be used for receiving the indication mains switch; For example; Be coupled in the mains switch 1804 between AC power 1802 and the AC/DC converter 1806, the switch monitor signal TS of action, and the output voltage V of regulating isolated DC/direct current transducer 1807 through adjustment feedback signal CFB according to switch monitor signal TS OUTIn one embodiment, the port of light adjusting controller 1816 comprises: CLK/OVP, FB, COMP, RT, VDD and GND.
Port CLK/OVP is coupled in secondary winding 2006, is used to receive the switch monitor signal TS that indication is coupled in the action of the mains switch 1804 between AC power 1802 and the AC/DC converter 1806.In one embodiment, after mains switch 1804 was connected, switch monitor signal TS had the positive negative pulse stuffing waveform.Specifically, when the voltage of the secondary winding 2006 of transformer 1808 increased to the rising threshold value of transformer 1808, switch monitor signal TS became positive voltage level from negative voltage level.When the voltage drop of the secondary winding 2006 of transformer 1808 was low to moderate the falling-threshold value of transformer 1808, switch monitor signal TS became negative voltage level from positive voltage level.In one embodiment, after mains switch 1804 broke off, switch monitor signal TS was zero.The voltage of light adjusting controller 1816 monitoring switch monitor signal TS is with when conducting/disconnection of the action of monitoring mains switch 1804 and detecting mains switch 1804.In one embodiment, light adjusting controller 1816 comprises that also (Over-Voltage Protection, OVP) circuit is avoided the overpressure situation of LED chain 1812 to overvoltage protection.
Port FB is coupled in current sense resistance R 5, is used to receive the electric current I of indicating the LED chain 1812 of flowing through LEDCurrent monitoring signal SEN.Port COMP is used to produce the control switch Q1 that compensating signal is connected with the former limit winding 2004 of transformer 1808 with control, thus the electric energy of regulating LED chain 1812 according to the action and the switch monitor signal TS of mains switch 1804.Specifically, the compensating signal on port COMP is used to adjust the received feedback signal CFB of on-off controller 1810.
Port RT is used for being provided with predetermined amount of time.In one embodiment, after the predetermined amount of time expiration, the counter in the replacement light adjusting controller 1816.Port VDD is used to light adjusting controller 1816 electric energy is provided.In one embodiment, energy-storage units like capacitor C 6, is connected between port VDD and the ground.Energy-storage units is light adjusting controller 1816 power supplies when mains switch 1804 breaks off.Port GND links to each other with ground.
Advantageously, according to the off action of mains switch 1804 in the circuit of former limit, the light adjusting controller 1816 after mains switch 1804 is connected once more in the secondary circuit capable of using carries out feedback control loop control, thereby the brightness of LED chain 1812 is adjusted to desired value.
Shown in Figure 21 is the structural representation of the light adjusting controller 1816 among Figure 20.Figure 21 will combine Figure 20 to describe.Parts identical with Figure 20 label among Figure 21 have similar function, are not repeated in this description for not doing at this for simplicity.
Light adjusting controller 1816 comprises triggering monitoring means 2131 and dimmer 2133.Trigger monitoring means 2131 through port CLK/OVP receiving key monitor signal TS, and the action of the external power switch 1804 that is detected according to port CLK/OVP produces drive signal 2120.In one embodiment, trigger monitoring means 2131 and comprise clamper module 2117 and light modulation judge module 2113.Clamper module 2117 is used for the voltage of clamp switch monitor signal TS.Light modulation judge module 2113 is used for producing drive signal 2120 according to switch monitor signal TS.In one embodiment, if port CLK/OVP detects the off action of mains switch 1804, trigger monitoring means 2131 and produce drive signal 2120.Trigger monitoring means 2131 and comprise that also OVP circuit 2115 avoids the overpressure situation of LED chain 1812.
Dimmer 2133 is coupled in and triggers monitoring means 2131, is used to produce dim signal, and for example reference signal REF3 comes according to drive signal 2120 adjustment feedback signal CFB.In one embodiment, dimmer 2133 comprises counter 2111.The action frequency that is used to calculate mains switch 1804 by the counter 2111 of drive signal 2120 drivings.Dimmer 2133 can also comprise the digital to analog converter 2107 that is coupled in counter 2111, is used for producing dim signal according to the count value of counter 2111.Specifically, after mains switch 1804 broke off, switch monitor signal TS was zero.In one embodiment, when on port CLK/OVP, detecting no-voltage, trigger monitoring means 2131 and produce drive signal 2120.The count value of counter 2111 changes according to drive signal 2120, for example adds 1.Digital to analog converter 2107 reads count value from counter 2111, and produces dim signal according to count value.Dim signal can be used for adjusting the output voltage V of isolated DC/direct current transducer 1807 OUTThereby, the brightness of adjustment LED chain 1812.
As stated, dim signal can be for having the analog REF3 of variable voltage.Digital to analog converter 2107 can be adjusted the voltage of reference signal REF3 according to the count value of counter 2111.In the embodiment shown in Figure 21, the voltage of the reference signal REF3 decision electric current I of LED chain 1812 of flowing through LEDThe desired value of mean value.Thus, can adjust the brightness of LED chain 1812 through adjustment reference signal REF3.
In one embodiment, the count value increase of counter 2111 makes digital to analog converter 2107 turn down the voltage of reference signal REF3.For example, if count value is 0, then the voltage of digital to analog converter 2107 adjustment reference signal REF3 is V6.Monitor the off action of mains switch 1804 if trigger monitoring means 2131 at port CLK/OVP, thereby make count value be increased to 1, then the voltage of digital to analog converter 2107 adjustment reference signal REF3 is V7, and V7 is less than V6.In another embodiment, the count value increase of counter 2111 makes digital to analog converter 2107 heighten the voltage of reference signal REF3.
In one embodiment, when the count value of counter 2111 reached maximum, count value was changed to predetermined value again, and for example 0.By way of example, if counter 2111 is one two digit counters, count value will be increased to 1,2,3 successively since 0, behind four opening operations of mains switch 1804, get back to 0 then.Accordingly, the brightness of LED chain 1812 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.Dimmer 2133 also can comprise the timer 2109 that is coupled in counter 2111.When triggering monitoring means 2131 when port CLK/OVP monitors the off action of mains switch 1804, timer 2109 picks up counting.Surpass predetermined amount of time if mains switch 1804 continues to break off, for example surpass 3 seconds, the count value of counter 2111 is changed to predetermined value again, for example puts 0.This predetermined amount of time is to be determined by the voltage on the port RT of light adjusting controller 1816.Advantageously, if a plurality of led light source drive circuit is by a common wall-board switch control, but utilize each led light source of timer 2109 Synchronization Control.
In one embodiment, light adjusting controller 1816 works in the simulation light-modulating mode, wherein relatively dim signals (being reference signal REF3) and the electric current I of indicating the LED chain 1812 of flowing through of operational amplifier 2105 LEDCurrent monitoring signal SEN, and produce compensating signal and adjust feedback signal CFB.When the voltage of current monitoring signal SEN during greater than the voltage of reference signal REF3, the flow through electric current I of LED chain 1812 of expression LEDGreater than the desired value by the mean value of the electric current of reference signal REF3 decision, operational amplifier 2105 adjustment compensating signals are to reduce the voltage on the port COMP.Accordingly, the electric current of the optical coupler 1818 of flowing through increases, and the voltage of the feedback signal CFB on the port FB of on-off controller 1810 reduces.Therefore, on-off controller 1810 reduces the duty ratio of drive signal DRV according to feedback signal CFB, thereby reduces the output electric energy of isolated DC/direct current transducer 1807.Similarly, when the voltage of current monitoring signal SEN during less than the voltage of reference signal REF3, the flow through electric current I of LED chain 1812 of expression LEDLess than the desired value of the current average that is determined by reference signal REF3, operational amplifier 2105 adjustment compensating signals are to increase the voltage on the port COMP.Accordingly, the voltage of the feedback signal CFB on the port FB of on-off controller 1810 increases.Therefore, on-off controller 1810 improves the duty ratio of drive signal DRV according to feedback signal CFB, thereby increases the output electric energy of isolated DC/direct current transducer 1807.
Light adjusting controller 1816 also can comprise or door 2103.Or door 2103 receives overvoltage signal that is produced by OVP circuit 2115 and the shutoff signal that is produced by counter 2111.The cut-out of this shutoff signal indication LED chain 1812.Specifically, when the voltage of switch monitor signal TS surpassed predetermined safe voltage, OVP circuit 2115 produced the overvoltage signals.In one embodiment, when light adjusting controller 1816 detects mains switch 1804 lasting disconnections above predetermined amount of time according to switch monitor signal TS, for example surpass 3 seconds, counter 2111 produces shutoff signals.In addition, the count value of counter 2111 is reset and is predetermined value, for example puts 0.Shutoff signal also can be produced by light modulation judge module 2113 or other unit, and is not to be limited to setting shown in Figure 21.Or door 2103 is connected switch 2121 according to overvoltage signal or shutoff signal output control signal.Specifically, according to the overvoltage signal of the overpressure situation of indication LED chain 1812, the shutoff signal of the cut-out of for example logical one, or indication LED chain 1812, logical one for example, light adjusting controller 1816 is pulled down to ground (pullto zero) with the voltage on the port COMP.Therefore, the electric current of the optical coupler 1818 of flowing through increases to maximum, and the voltage of feedback signal CFB is reduced to minimum value.Therefore, on-off controller 1810 stops to produce drive signal DRV.In one embodiment, when LED chain 1812 was reworked and recover luminous, overvoltage signal and shutoff signal all were logical zero.Thereby switch 2121 is cut off operational amplifier 2105 according to the voltage on reference signal REF3 and the current monitoring signal SEN adjustment port COMP.
Light adjusting controller 1816 also comprises startup and the low pressure lock-in circuit 2101 that is coupled in its port VDD, is used for optionally starting according to different electric energy situation one or more parts of light adjusting controller 1816 inside.In one embodiment, if the voltage on the port VDD is higher than first predeterminated voltage, then startup and low pressure lock-in circuit 2101 will start parts all in the light adjusting controller 1816.When mains switch 1804 breaks off, if the voltage on the port VDD is lower than second predeterminated voltage, startup and low pressure lock-in circuit 2101 will be closed in the light adjusting controller 1816 except triggering monitoring means 2131 and the miscellaneous part the dimmer 2133 to save electric energy.If the voltage on the port VDD is lower than the 3rd predeterminated voltage, startup and low pressure lock-in circuit 2101 will be closed parts all in the light adjusting controller 1816.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 1816 can be by capacitor C 6 through port VDD power supply, so after even if mains switch 1804 breaks off, trigger monitoring means 2131 and can also work a period of time with dimmer 2133.
Shown in Figure 22ly be the signal waveform sketch map of simulation under the light-modulating mode, comprising voltage, drive signal DRV, switch monitor signal TS, the output voltage V on the port VDD of the on/off state of mains switch 1804, on-off controller 1810 OUTAnd reference signal REF3.Figure 22 will combine Figure 20 and Figure 21 to describe.
In operation, at time point t0, mains switch 1804 is connected.At time point t1, the voltage on the port VDD of on-off controller 1810 increases to and enables threshold value V STH1, 13V for example, on-off controller 1810 produces drive signal DRV.In case mains switch 1804 breaks off, the voltage on the port VDD of on-off controller 1810 begins to descend.At time point t2, the voltage on the port VDD of on-off controller 1810 drops to forbidden energy threshold value V STH2, 9V for example, on-off controller 1810 stops to produce drive signal DRV.Although Figure 22 does not illustrate that the duty ratio of drive signal DRV can obtain adjustment according to the feedback signal CFB of on-off controller 1810.
In addition, at time point t1, t3, t5 and t7, the voltage on the port VDD of on-off controller 1810 increases to and enables threshold value V STH1, switch monitor signal TS becomes the positive negative pulse stuffing waveform from zero.At time point t2, t4 and t6, the voltage on the port VDD of on-off controller 1810 drops to forbidden energy threshold value V STH2, switch monitor signal TS is from the vanishing of positive negative pulse stuffing waveform.Through monitoring switch monitor signal TS, light adjusting controller 1816 can be detected the off action of mains switch 1804 and adjust reference signal REF3.
In the embodiment shown in Figure 22, reference signal REF3 has three kinds of voltage: 150mV, 100mV and 30mV.At time point t1, switch monitor signal TS detects mains switch 1804 and connects.Reference signal REF3 has first level, for example 150mV.At time point t2, switch monitor signal TS detects mains switch 1804 disconnections and reference signal REF3 is adjusted to second level, for example 100mV from first level.In the embodiment shown in Figure 22, between time point t2 and the t3 interval greater than predetermined amount of time, t3-t2＞3 second for example, expression mains switch 1804 continue to break off surpass predetermined amount of time after connection.Therefore, during t3 to t4, reference signal REF3 is changed to predetermined level, for example 150mV again.At time point t4, switch monitor signal TS detects mains switch 1804 disconnections and reference signal REF3 is adjusted to second level from first level.The time interval between time point t4 and the t5 is less than predetermined amount of time, t5-t4＜3 second for example, and the expression mains switch is shorter than predetermined amount of time 1804 opening times.Therefore, during t5 to t6, reference signal REF3 keeps second level.At time point t6, switch monitor signal TS detects mains switch 1804 disconnections and reference signal REF3 is adjusted to the 3rd level, for example 30mV from second level.Accordingly, the brightness of LED chain 1812 obtains adjustment according to reference signal REF3.
Shown in Figure 23 is the sketch map of light source driving circuit 2300 according to an embodiment of the invention.Figure 23 will combine Figure 20 to describe.Parts identical with Figure 20 label among Figure 23 have similar function, are not repeated in this description for not doing at this for simplicity.Except light adjusting controller 2316, the sketch map of light source driving circuit 2300 shown in Figure 23 is similar to the sketch map of light source driving circuit shown in Figure 20 2000.In the embodiment shown in Figure 23, the port of light adjusting controller 2316 comprises: CLK/OVP, FB, COMP, PWM, VDD and GND.Port CLK/OVP receives the switch monitor signal TS of the action of indication mains switch 1804.
Port FB receives the electric current I of indicating the LED chain 1812 of flowing through LEDCurrent monitoring signal SEN.Produce compensating signal according to current monitoring signal SEN and switch monitor signal TS at port COMP.Indicate the electric current I of the LED chain 1812 of flowing through LEDDesired value feedback signal CFB can via optical coupler 1818 according to compensating signal obtain the adjustment.Therefore, the brightness of the output electric energy of the duty ratio of drive signal DRV, isolated DC/direct current transducer 1807 and LED chain 1812 obtains corresponding adjustment.
Port PWM is coupled in control switch Q2.Control switch Q2 connects with LED chain 1812, and is connected to ground through current monitoring resistance R 5.Light adjusting controller 2316 is controlled the conducting state of control switch Q2 through the pwm signal DRV2 on the port PWM; On/off state for example; And through the duty ratio of adjustment pwm signal DRV2, light adjusting controller 2316 can be adjusted the electric current I of the feedback signal CFB and the LED chain 1812 of flowing through LEDBy way of example, if pwm signal DRV2 has 100% duty ratio, then LED chain 1812 has high-high brightness.If the duty ratio of pwm signal DRV2 is less than 100%, then the brightness of LED chain 1812 is lower than high-high brightness.For example and and unrestricted, the duty ratio of pwm signal DRV2 can be 100%, 75%, 50% and 25%, LED chain 1812 can have 100% brightness, 75% brightness, 50% brightness and 25% brightness respectively accordingly.
Port VDD is used to light adjusting controller 2316 electric energy is provided.In one embodiment, energy-storage units like capacitor C 6, is connected between port VDD and the ground.Energy-storage units is light adjusting controller 2316 power supplies when mains switch 1804 breaks off.Port GND links to each other with ground.
Advantageously, according to the off action of mains switch 1804 in the circuit of former limit, the light adjusting controller 2316 after mains switch 1804 is connected once more in the secondary circuit capable of using carries out feedback control loop control, thereby the brightness of LED chain 1812 is adjusted to desired value.
Shown in Figure 24 is the structural representation of the light adjusting controller 2316 among Figure 23.Figure 24 will combine Figure 23 to describe.Parts identical with Figure 23 label with Figure 21 among Figure 24 have similar function, are not repeated in this description for not doing at this for simplicity.
Except dimmer 2433 and operational amplifier 2405, the similar of light adjusting controller 2316 shown in Figure 24 is in the structure of light adjusting controller shown in Figure 21 1816.In the embodiment shown in Figure 24, dimmer 2433 comprises counter 2411 that is coupled in triggering monitoring means 2131 and the digital to analog converter 2407 that is coupled in counter 2111.Counter 2411 is by triggering drive signal 2420 drivings that monitoring means 2131 is produced.Counter 2411 is used to calculate the action frequency of mains switch 1804.Specifically, in one embodiment, after mains switch 1804 broke off, switch monitor signal TS was zero.In one embodiment, when on port CLK/OVP, detecting no-voltage, trigger monitoring means 2131 and produce drive signal 2420.The count value of counter 2411 changes according to drive signal 2420, for example adds 1.Digital to analog converter 2407 reads count value from counter 2411, and produces dim signal 2408 according to count value.Dimmer 2433 also can comprise the timer 2409 that is coupled in counter 2411, and it is similar to timer shown in Figure 21 2109.
Dimmer 2433 also comprises the PWM generator 2409 that is coupled in digital to analog converter 2407.In one embodiment, light adjusting controller 2316 works in the pulse light modulation pattern, and wherein PWM generator 2409 produces pwm signal DRV2 according to dim signal 2408.The duty ratio of pwm signal DRV2 is by dim signal 2408 decisions, for example can be 100%, 75%, 50% and 25%.The control switch Q2 that pwm signal DRV2 adjustment feedback signal CFB and control are connected with LED chain 1812.Specifically, operational amplifier 2405 received current monitor signal SEN and reference signal REF4, and on port COMP, produce compensating signal.In the embodiment shown in Figure 24, reference signal REF4 is the direct current signal with essence constant voltage.When pwm signal DRV2 is first state, logical one for example, control switch Q2 connects and switch 2423 breaks off.Therefore, operational amplifier 2405 produces compensating signal according to current monitoring signal SEN and reference signal REF4.This compensating signal can be indicated the electric current I of the LED chain 1812 of flowing through via optical coupler 1818 adjustment LEDThe feedback signal CFB of desired value.When pwm signal DRV2 is second state, logical zero for example, control switch Q2 breaks off and switch 2423 is connected.Therefore, the voltage of compensating signal is pulled down to ground.The voltage of feedback signal CFB is reduced to minimum value, and on-off controller 1810 stops to produce drive signal DRV.Therefore, dim signal 2408 can be used for adjusting feedback signal CFB, adjusts the brightness of LED chain 1812 thereupon.
Light adjusting controller 2316 also can comprise or door 2403.Or door 2403 receives overvoltage signal that is produced by OVP circuit 2115 and the shutoff signal that is produced by counter 2411, the cut-out of above-mentioned shutoff signal indication LED chain 1812.Specifically, when the voltage of switch monitor signal TS surpassed predetermined safe voltage, OVP circuit 2115 produced the overvoltage signals.In one embodiment, when light adjusting controller 2316 detects mains switch 1804 lasting disconnections above predetermined amount of time according to switch monitor signal TS, for example surpass 3 seconds, counter 2411 produces shutoff signals.In addition, the count value of counter 2411 is reset and is predetermined value, for example puts 0.Or door 2403 is similar with operation principle shown in Figure 21 or door 2103 and switch 2121 with the operation principle of switch 2421.
Advantageously, according to the off action of mains switch 1804 in the circuit of former limit, the light adjusting controller 2316 after mains switch 1804 is connected once more in the secondary circuit capable of using carries out feedback control loop control, thereby the brightness of LED chain 1812 is adjusted to desired value.
Shown in Figure 25 is signal waveform sketch map under the pulse light modulation pattern, comprising voltage, drive signal DRV, switch monitor signal TS, the output voltage V on the port VDD of the on/off state of mains switch 1804, on-off controller 1810 OUTAnd the duty ratio of pwm signal DRV2.Figure 25 will combine Figure 23 and Figure 24 to describe.
Voltage, drive signal DRV, switch monitor signal TS and output voltage V on the on/off state of mains switch 1804, the port VDD of on-off controller 1810 OUTBetween relation object be similar to relation shown in Figure 22.In simulation light-modulating mode shown in Figure 22, REF3 can adjust output voltage V accordingly through the adjustment reference signal OUTThereby, the brightness of adjustment LED chain 1812.In pulse light modulation pattern shown in Figure 25, at time point t0, mains switch 1804 is connected.At time point t1, switch monitor signal TS detects mains switch 1804 and connects, and pwm signal DRV2 has first duty ratio, and for example 100%.At time point t2, switch monitor signal TS detects mains switch 1804 and breaks off.In the embodiment shown in Figure 25, between time point t2 and the t3 interval greater than predetermined amount of time, t3-t2＞3 second for example, indication mains switch 1804 continue to break off surpass predetermined amount of time after connection.Therefore, during t3 to t4, the duty ratio of pwm signal DRV2 is changed to predetermined value again, and for example 100%.At time point t4, switch monitor signal TS detects mains switch 1804 and breaks off.The time interval between time point t4 and the t5 is less than predetermined amount of time, t5-t4＜3 second for example, and the indication mains switch is shorter than predetermined amount of time 1804 opening times.Therefore, during t5 to t6, the duty ratio of pwm signal DRV2 is adjusted to second duty ratio, and for example 50%.Similarly, at time point t7, the duty ratio of pwm signal DRV2 is adjusted to the 3rd duty ratio, and for example 25%.Duty ratio through adjustment pwm signal DRV2 can be adjusted output voltage V accordingly OUTThereby, the brightness of adjustment LED chain 1812.
Shown in Figure 26 for according to an embodiment of the invention to light source, led light source for example carries out the method flow diagram 2600 of controlling electric energy.Figure 26 will combine Figure 20, Figure 21, Figure 23 and Figure 24 to describe.
In step 2602, DC-DC converter for example comprises the isolated DC/direct current transducer 1807 of transformer 1806, provides the electric energy after the adjusting that led light source is supplied power, and for example LED chain 1812 is supplied power.
In step 2604, receive the feedback signal CFB of the desired value of the electric current of indicating the light source of flowing through, for example receive by on-off controller 1810.
In step 2606, receiving key monitor signal TS is for example received by the light adjusting controller in the secondary circuit 1816, and this switch monitor signal TS indicates the action of mains switch in the circuit of former limit, the for example action of mains switch 1804.
In step 2608, produce dim signal according to switch monitor signal TS.
In step 2610; According to dim signal adjustment feedback signal, and according to adjusted feedback signal generation drive signal DRV, with the switch of the former limit windings in series of transformer in control and the DC-DC converter; The output electric energy of for example control switch Q1, and then adjusting DC-DC converter.In an embodiment who adopts the simulation light-modulating mode, regulate the output electric energy of DC-DC converter through the flow through current monitoring signal SEN of source current of dim signal relatively and indication.Adopt among the embodiment of pulse light modulation pattern at another, through recently regulate the output electric energy of DC-DC converter according to the duty of dim signal adjustment pulse width modulating signal.
As previously mentioned, the present invention has disclosed a kind of light source driving circuit, and the switch monitor signal that this light source driving circuit moves according to the indication mains switch is adjusted the electric energy of light source, and mains switch can be fixing mains switch on the wall.The electric energy of this light source is provided by isolated DC/direct current transducer, and is adjusted through the switch of the former limit windings in series of transformer in control and the isolated DC/direct current transducer by light adjusting controller.
The user can like off action, regulate the brightness of light source, and needn't use additional devices through the action to the common power switch, for example need not custom-designed switch with light modulation button, thereby saves cost.
Wording in this use all is illustrative rather than definitive thereof with expressing; Use these wording will get rid of outside invention scope at any equivalent (or part equivalent) of the characteristic of this diagram and description, possibly have various modifications within the scope of the claims with expressing not.Other modification, variant and alternative also possibly exist.Therefore, claim is intended to contain all these type of equivalents.

Claims (24)

1. one kind is carried out the drive circuit of controlling electric energy to LED source, it is characterized in that said drive circuit comprises:
Transformer, said transformer comprise that reception provides the secondary winding of output electric energy from the former limit winding of the input electric energy of AC/DC converter with for said LED source;
Be connected in the on-off controller between optical coupler and the said former limit winding; Be used for receiving the feedback signal of the desired value of the electric current of indicating the said LED source of flowing through, and control the input electric energy of said former limit winding according to said feedback signal from said optical coupler; And
The light adjusting controller that is connected with said secondary winding; Said light adjusting controller receives the switch monitor signal of the action of indication mains switch; And regulate the output electric energy of said transformer through adjusting said feedback signal according to said switch monitor signal, wherein said mains switch is connected between AC power and the said AC/DC converter.
2. drive circuit according to claim 1 is characterized in that, said LED source is the light-emitting diode chain.
3. drive circuit according to claim 1 is characterized in that, the action of said mains switch comprises breaks off said mains switch.
4. drive circuit according to claim 1 is characterized in that, said transformer also is included as the auxiliary winding that said on-off controller provides electric energy.
5. drive circuit according to claim 1; It is characterized in that; Said on-off controller produces pulse width modulating signal and optionally connects the control switch with said former limit windings in series, and recently adjusts the output electric energy of said transformer through the duty of adjusting said pulse width modulating signal.
6. drive circuit according to claim 1 is characterized in that, said light adjusting controller is monitored the voltage of said switch monitor signal to monitor the action of said mains switch.
7. drive circuit according to claim 1 is characterized in that, said light adjusting controller comprises:
Trigger monitoring means, be used to receive said switch monitor signal and produce drive signal according to the action of said mains switch; And
With the dimmer that said triggering monitoring means links to each other, be used for producing dim signal to adjust said feedback signal according to said drive signal.
8. drive circuit according to claim 7 is characterized in that, said dimmer comprises:
Counter by said drive; And
With the digital to analog converter that said counter links to each other, be used for producing said dim signal according to the count value of said counter.
9. drive circuit according to claim 8 is characterized in that, if said mains switch continue to break off surpasses predetermined amount of time, and the said light adjusting controller said counter of resetting.
10. drive circuit according to claim 7; It is characterized in that; Said light adjusting controller works in the pulse light modulation pattern, under said pulse light modulation pattern, produces pulse width modulating signal according to said dim signal; The duty ratio of said pulse width modulating signal is determined by said dim signal, and said pulse width modulating signal is adjusted said feedback signal and controlled the second switch of connecting with said LED source.
11. drive circuit according to claim 7; It is characterized in that; Said light adjusting controller works in the simulation light-modulating mode; Under said simulation light-modulating mode, the current monitoring signal of more said dim signal of the operational amplifier of said light adjusting controller and the electric current of indicating the said LED source of flowing through, and produce compensating signal to adjust said feedback signal.
12. a light adjusting controller is characterized in that, said light adjusting controller is connected with the secondary winding of transformer, and said light adjusting controller control is from the electric energy of AC/DC converter to LED source, and said light adjusting controller comprises:
The switch monitoring port is used to receive the switch monitor signal of the action of indication mains switch, and wherein said mains switch is connected between AC power and the said AC/DC converter;
The current monitoring port is used to receive the flow through current monitoring signal of electric current of said LED source of indication; And
The compensation port is used for producing compensating signal according to the action of said mains switch and said current monitoring signal and controls the control switch with the former limit windings in series of said transformer, to adjust the electric energy of said LED source.
13. light adjusting controller according to claim 12 is characterized in that, the action of said mains switch comprises breaks off said mains switch.
14. light adjusting controller according to claim 12 is characterized in that, said switch monitoring port is monitored the voltage of said switch monitor signal to monitor the action of said mains switch.
15. light adjusting controller according to claim 12 is characterized in that, according to the overvoltage signal of the overpressure situation of indicating said LED source, said light adjusting controller is pulled down to ground with the voltage on the said compensation port.
16. light adjusting controller according to claim 12 is characterized in that, said light adjusting controller also comprises:
Trigger monitoring means, be used for receiving said switch monitor signal and producing drive signal according to the action of said mains switch from said switch monitoring port; And
With the dimmer that said triggering monitoring means links to each other, be used for producing dim signal to adjust said compensating signal according to said drive signal.
17. light adjusting controller according to claim 16 is characterized in that, said light adjusting controller also comprises:
Counter by said drive; And
With the digital to analog converter that said counter links to each other, be used for producing said dim signal according to the count value of said counter.
18. light adjusting controller according to claim 17 is characterized in that, if said mains switch continue to break off surpasses predetermined amount of time, and the said light adjusting controller said counter of resetting.
19. light adjusting controller according to claim 16; It is characterized in that; Said light adjusting controller works in the pulse light modulation pattern, under said pulse light modulation pattern, produces pulse width modulating signal according to said dim signal; The duty ratio of said pulse width modulating signal is determined by said dim signal, and said pulse width modulating signal is adjusted said compensating signal and controlled the second switch of connecting with said LED source.
20. light adjusting controller according to claim 16; It is characterized in that; Said light adjusting controller works in the simulation light-modulating mode; Under said simulation light-modulating mode, more said dim signal of the operational amplifier of said light adjusting controller and said current monitoring signal, and produce said compensating signal.
21. one kind is carried out the method for controlling electric energy to LED source, it is characterized in that said method comprises:
Transformer provides the electric energy after the adjusting that said LED source is supplied power;
Receive the feedback signal of the desired value of the electric current of indicating the said LED source of flowing through;
Receive the switch monitor signal of the action of mains switch in the circuit of the former limit of indication;
Produce dim signal according to said switch monitor signal; And
Adjust the output electric energy that said feedback signal is adjusted said transformer according to said dim signal.
22. method according to claim 21 is characterized in that, the action of said mains switch comprises breaks off said mains switch.
23. method according to claim 21 is characterized in that, adjusts said feedback signal according to said dim signal and adjusts the step of the output electric energy of said transformer and comprise:
If adopt the simulation light-modulating mode, the current monitoring signal of then more said dim signal and the electric current of indicating the said LED source of flowing through also produces compensating signal; And adjust said feedback signal according to said compensating signal.
24. method according to claim 21 is characterized in that, adjusts said feedback signal according to said dim signal and adjusts the step of the output electric energy of said transformer and comprise:
If adopt the pulse light modulation pattern, then produce pulse width modulating signal according to said dim signal; And adjust said feedback signal according to said pulse width modulating signal.
CN201110447599.XA 2008-12-12 2011-12-28 Drive circuit, dimmer controller and method for electrically controlling light-emitting diode (LED) light source Expired - Fee Related CN102548143B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN201110447599.XA CN102548143B (en) 2011-12-28 2011-12-28 Drive circuit, dimmer controller and method for electrically controlling light-emitting diode (LED) light source
US13/369,620 US9030122B2 (en) 2008-12-12 2012-02-09 Circuits and methods for driving LED light sources
IN931DE2012 IN2012DE00931A (en) 2011-12-28 2012-03-28
JP2012104480A JP2013140931A (en) 2011-12-28 2012-05-01 Circuits and methods for driving led light sources
EP12180381.1A EP2611263A3 (en) 2011-12-28 2012-08-14 Circuits and methods for driving LED light sources
TW101141648A TWI568309B (en) 2011-12-28 2012-11-08 Driving circuit, dimming controller and control methods for light source
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CN103256509A (en) * 2013-05-22 2013-08-21 北京铨富光电科技有限公司 Sectional type LED dimming lamp without externally arranged dimmer and dimming method thereof
CN103415111A (en) * 2013-07-30 2013-11-27 浙江生辉照明有限公司 Drive circuit and drive method of LED illuminating device
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CN105517275A (en) * 2014-10-08 2016-04-20 凹凸电子（武汉）有限公司 A driving circuit, a dimming controller and a method for adjusting power of a light source
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CN106028519A (en) * 2016-06-15 2016-10-12 陕西亚成微电子股份有限公司 LED dimming chip
CN107590058A (en) * 2017-09-13 2018-01-16 深圳市嘉合劲威电子科技有限公司 Method and device based on switch switching memory bar light-emitting mode
CN109275229A (en) * 2018-10-22 2019-01-25 横店集团得邦照明股份有限公司 A kind of light adjusting circuit and its implementation detecting Alternating Current Power Supply waveform
CN110035582A (en) * 2019-04-22 2019-07-19 晨辉光宝科技股份有限公司 LED lamp tube
CN110322829A (en) * 2018-03-30 2019-10-11 脸谱科技有限责任公司 The pulse width modulation controlled of light emitting diode
CN112306789A (en) * 2019-07-29 2021-02-02 鸿富锦精密电子(天津)有限公司 Power failure monitoring system and method
CN112788815A (en) * 2019-11-04 2021-05-11 海信视像科技股份有限公司 Display device and power supply circuit
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CN102957324A (en) * 2012-11-23 2013-03-06 深圳市振邦实业有限公司 Power detection circuit
CN103256509A (en) * 2013-05-22 2013-08-21 北京铨富光电科技有限公司 Sectional type LED dimming lamp without externally arranged dimmer and dimming method thereof
CN103256509B (en) * 2013-05-22 2014-10-29 北京铨富光电科技有限公司 Sectional type LED dimming lamp without externally arranged dimmer and dimming method thereof
CN103415111A (en) * 2013-07-30 2013-11-27 浙江生辉照明有限公司 Drive circuit and drive method of LED illuminating device
CN103415111B (en) * 2013-07-30 2016-06-22 浙江生辉照明有限公司 The drive circuit of LED light device and driving method
CN103702480B (en) * 2013-12-16 2016-04-20 生迪光电科技股份有限公司 LED drive circuit and the method in conjunction with mains switch change glow color thereof
CN103702480A (en) * 2013-12-16 2014-04-02 生迪光电科技股份有限公司 LED (Light-Emitting Diode) driving circuit and emitted light color changing method through LED driving circuit in combination with power switch
CN105517275A (en) * 2014-10-08 2016-04-20 凹凸电子（武汉）有限公司 A driving circuit, a dimming controller and a method for adjusting power of a light source
CN105517274A (en) * 2014-10-08 2016-04-20 光明电子股份有限公司 driving circuit of light emitting diode and light emitting device thereof
CN105517274B (en) * 2014-10-08 2018-11-06 重庆市妙格半导体研究院有限公司 driving circuit of light emitting diode and light emitting device thereof
CN104717802B (en) * 2015-01-12 2017-09-26 上海阿卡得电子有限公司 Multistage dimming control signal formation circuit
CN104717802A (en) * 2015-01-12 2015-06-17 上海阿卡得电子有限公司 Multi-section dimming control signal forming circuit
CN105228306A (en) * 2015-09-30 2016-01-06 桂林么么科技发展有限公司 Based on light adjusting system and the application thereof of wireless energy transfer
CN105491758A (en) * 2015-12-11 2016-04-13 中山市尊宝实业有限公司 New energy-efficiency standard energy-saving circuit with high power factor and ultra-low stand-by power consumption
CN106028521A (en) * 2016-06-15 2016-10-12 陕西亚成微电子股份有限公司 Control method of dimming circuit
CN106028519A (en) * 2016-06-15 2016-10-12 陕西亚成微电子股份有限公司 LED dimming chip
CN107590058A (en) * 2017-09-13 2018-01-16 深圳市嘉合劲威电子科技有限公司 Method and device based on switch switching memory bar light-emitting mode
CN110322829A (en) * 2018-03-30 2019-10-11 脸谱科技有限责任公司 The pulse width modulation controlled of light emitting diode
CN110322829B (en) * 2018-03-30 2022-07-12 脸谱科技有限责任公司 Pulse width modulation control of light emitting diodes
CN109275229A (en) * 2018-10-22 2019-01-25 横店集团得邦照明股份有限公司 A kind of light adjusting circuit and its implementation detecting Alternating Current Power Supply waveform
CN109275229B (en) * 2018-10-22 2023-12-01 横店集团得邦照明股份有限公司 Dimming circuit for detecting alternating current power supply waveform and dimming method thereof
CN110035582A (en) * 2019-04-22 2019-07-19 晨辉光宝科技股份有限公司 LED lamp tube
CN112306789A (en) * 2019-07-29 2021-02-02 鸿富锦精密电子(天津)有限公司 Power failure monitoring system and method
CN112306789B (en) * 2019-07-29 2022-08-12 富联精密电子(天津)有限公司 Power failure monitoring system and method
CN112788815A (en) * 2019-11-04 2021-05-11 海信视像科技股份有限公司 Display device and power supply circuit
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
WO2023071081A1 (en) * 2021-10-27 2023-05-04 上海先钧光电科技有限公司 Led dimming circuit, dimmer, and lighting apparatus

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