CN203675399U - Light-emitting element driving system and driving control circuit - Google Patents
Light-emitting element driving system and driving control circuit Download PDFInfo
- Publication number
- CN203675399U CN203675399U CN201420040181.6U CN201420040181U CN203675399U CN 203675399 U CN203675399 U CN 203675399U CN 201420040181 U CN201420040181 U CN 201420040181U CN 203675399 U CN203675399 U CN 203675399U
- Authority
- CN
- China
- Prior art keywords
- signal
- control
- switch
- circuit
- dim
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 46
- 238000013519 translation Methods 0.000 claims description 23
- 230000000052 comparative effect Effects 0.000 claims description 16
- 230000001143 conditioned effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 17
- 239000003990 capacitor Substances 0.000 description 10
- 230000000737 periodic effect Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 101710170230 Antimicrobial peptide 1 Proteins 0.000 description 2
- 101710170231 Antimicrobial peptide 2 Proteins 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 101100464782 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CMP2 gene Proteins 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- HODRFAVLXIFVTR-RKDXNWHRSA-N tevenel Chemical compound NS(=O)(=O)C1=CC=C([C@@H](O)[C@@H](CO)NC(=O)C(Cl)Cl)C=C1 HODRFAVLXIFVTR-RKDXNWHRSA-N 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a light-emitting element driving system and a driving control circuit. The driving system comprises a power conversion circuit which receives an input signal and converts the input signal to provide first and second signals which can be adjusted at the same time, a first switch which is coupled between the power conversion circuit and the first signal, and a control circuit which comprises a first compensation network and a second compensation network. The first compensation network generates a first compensation signal according to the first signal. The second compensation network generates a second compensation signal according to the second signal. When a dimming signal is effective, the first switch is controlled according to the first compensation signal, and at the same time the power conversion circuit is controlled according to the second compensation signal. The driving system simply needs the single stage power conversion circuit to provide two regulated signals at the same time, and has the advantages of simple structure and low cost.
Description
Technical field
The utility model relates to electronic circuit, especially a kind of light-emitting component driving system and Drive and Control Circuit.
Background technology
Along with scientific and technological development, LED (light-emitting diode, light-emitting diode), because its volume is little, drive simple and energy-conserving and environment-protective, replaces the application of fluorescent lamp in LCD backlight and general lighting just gradually.LED demand motive circuit provides controlled current signal for it.In some application scenario, except controlled LED electric current, also need some supply voltages such as 12V, 5V, with thinking other circuit or chip power supply.
The multistage circuit framework that existing LED drive system adopts voltage conversion circuit and LED drive circuit to be separated conventionally, as shown in Figure 1 at present LCD TV backlight in conventional a kind of LED drive system, comprise PFC (power factor correction, power factor correction) circuit, two isolated DC/DC translation circuits and a LED drive circuit, this direct voltage is converted to other circuit or the required supply voltage (for example 12V and 5V) of chip by one of them isolated DC/DC translation circuit, this direct voltage is converted to the required DC input voitage of LED drive circuit by another isolated DC/DC translation circuit.LED drive circuit is converted to this DC input voitage the required current signal of LED and is sent to LED panel.This multi-level pmultistage circuit framework generally needs multiple power circuits and control circuit, complex structure and with high costs.
Utility model content
For one or more problems of the prior art, an object of the present utility model is to provide a kind of light-emitting component driving system and Drive and Control Circuit.
According to the utility model embodiment, a kind of light-emitting component driving system, comprising: power conversion circuit, receives input signal and it is converted, so that first signal and the secondary signal that can be conditioned to be provided simultaneously; The first switch, is coupled between power conversion circuit and first signal; And control circuit, comprise the first compensating network and the second compensating network, wherein the first compensating network produces the first compensating signal according to representing that the feedback signal of first signal and the first reference signal are compared, and the second compensating network produces the second compensating signal according to representing that the feedback signal of secondary signal and the second reference signal are compared; Wherein in the time that dim signal is effective, according to first compensation signal control the first switch, and according to the second compensation signal control power conversion circuit.
In one embodiment, secondary signal is used for driving light-emitting component.Wherein, in the time that dim signal is invalid, control circuit control the first switch keeps conducting, and according to the first compensation signal control power conversion circuit.Wherein said control circuit also comprises: pulse generating circuit, receive the first compensating signal and dim signal and produce the first control signal, wherein in the time that dim signal is effective, produce the first control signal to control conducting and the shutoff of the first switch according to the first compensating signal, in the time that dim signal is invalid, controls the first switch and keep conducting; And frequency control circuit, receive the first compensating signal, the second compensating signal and dim signal and produce the second control signal, wherein in the time that dim signal is effective, produce the second control signal with power ratio control translation circuit according to the second compensating signal, in the time that dim signal is invalid, produce the second control signal with power ratio control translation circuit according to the first compensating signal.
In one embodiment, first signal is used for driving light-emitting component.Wherein, in the time that dim signal is invalid, control circuit control the first switch keeps turn-offing, and according to the second compensation signal control power conversion circuit.
In one embodiment, described control circuit also comprises: pulse generating circuit, receives the first compensating signal and produce the first control signal to control conducting and the shutoff of the first switch; And frequency control circuit, receive the second compensating signal and produce the second control signal with power ratio control translation circuit according to the second compensating signal.Wherein frequency control circuit also produces synchronizing signal according to the second control signal, and pulse generating circuit receives described synchronizing signal, and according to the conducting moment of first compensation signal control the first switch, according to the shutoff moment of described synchronizing signal control the first switch.Wherein pulse generating circuit also receives dim signal, in the time that dim signal is effective, produces the first control signal to control conducting and the shutoff of the first switch according to the first compensating signal, in the time that dim signal is invalid, controls the first switch and keeps conducting or shutoff.
In one embodiment, described power conversion circuit comprises: primary circuit, comprise at least one switch, and receive input signal, and with shutoff, input signal is converted to AC signal by the conducting of described at least one switch; Transformer, comprise armature winding, the first secondary winding and second subprime winding, described armature winding is coupled to primary circuit to receive AC signal, and described transformer converts AC signal and provides respectively conversion rear signal by described the first secondary winding and described second subprime winding; The first rectification circuit, is electrically coupled to the first secondary winding, and to receive after the conversion of the first secondary winding output signal and to carry out rectification so that first signal to be provided, wherein the first switch is coupled between the first rectification circuit and first signal; And second rectification circuit, be electrically coupled to second subprime winding, to receive after the conversion of second subprime winding output signal and to carry out rectification so that secondary signal to be provided; Wherein control circuit is according to conducting and the shutoff of at least one switch described in the second compensation signal control, according to the conducting moment of first compensation signal control the first switch, and according to the conducting moment of described at least one switch or turn-off the moment and control shutoff moment of the first switch.
In one embodiment, described power conversion circuit comprises LLC controlled resonant converter, comprise: primary circuit, comprise second switch, the 3rd switch and resonant capacitance, wherein the first end of second switch receives described input signal, and the first end of the 3rd switch is coupled to the second end of second switch, the second end of the 3rd switch is coupled to systematically, and the first end of resonant capacitance is coupled to the second end of second switch and the first end of the 3rd switch; Transformer, comprises armature winding, the first secondary winding and second subprime winding, and described armature winding is coupled to the second end of resonant capacitance; The first rectification circuit, is electrically coupled to the first secondary winding so that first signal to be provided, and wherein the first switch is coupled between the first rectification circuit and first signal; And second rectification circuit, be electrically coupled to second subprime winding so that secondary signal to be provided; Wherein control circuit is according to conducting and the shutoff of the second compensation signal control second switch and the 3rd switch, according to the conducting moment of first compensation signal control the first switch, and control shutoff moment of the first switch according to the shutoff moment of second switch or the 3rd switch.
According to the utility model embodiment, a kind of driving control circuit for light-emitting component, comprising: voltage compensation network, by the feedback signal of representative voltage signal and voltage reference signal comparison, and produces voltage compensation signal according to comparative result; Current compensation network, flows through representative feedback signal and the current reference signal comparison of the electric current of light-emitting component, and according to comparative result generation current compensating signal; Pulse generating circuit, receiver voltage compensating signal and dim signal, wherein, in the time that dim signal is effective, produce the first control signal to regulate described voltage signal according to voltage compensation signal; And frequency control circuit, receiver voltage compensating signal, current compensation signal and dim signal, wherein in the time that dim signal is effective, produce the second control signal to flow through the electric current of light-emitting component described in regulating according to current compensation signal, in the time that dim signal is invalid, produce the second control signal to regulate described voltage signal according to voltage compensation signal.
According to the utility model embodiment, a kind of driving control circuit for light-emitting component, comprising: voltage compensation network, by the feedback signal of representative voltage signal and voltage reference signal comparison, and produces voltage compensation signal according to comparative result; Current compensation network, flows through representative feedback signal and the current reference signal comparison of the electric current of light-emitting component, and according to comparative result generation current compensating signal; Pulse generating circuit, received current compensating signal and dim signal, wherein in the time that dim signal is effective, produce the first control signal to flow through the electric current of light-emitting component described in regulating according to current compensation signal; And frequency control circuit, receiver voltage compensating signal, and produce the second control signal to regulate described voltage signal according to voltage compensation signal.
The signal that the utility model only needs single-stage power conversion circuit to provide two-way to be conditioned simultaneously, simple in structure and with low cost.In addition, respectively power conversion circuit and the first switch are controlled by two compensating networks, can realize the accurate control to two paths of signals simultaneously, when having improved accuracy, solve the unstable and interference problem there will be simultaneously provide two paths of signals from single-level circuit time.
Brief description of the drawings
Read detailed description below by reference to accompanying drawing, above-mentioned and other objects of the utility model execution mode, feature and advantage will become easy to understand.In the accompanying drawings, show some embodiments possible of the present utility model in exemplary and nonrestrictive mode, wherein:
Fig. 1 is the block diagram of existing LCD TV middle LED drive system backlight;
Fig. 2 a is according to the block diagram of the light-emitting component driving system of the utility model one embodiment;
Fig. 2 b is according to the block diagram of the LED drive system of the utility model one embodiment;
Fig. 2 c is according to the block diagram of the LED drive system of the another embodiment of the utility model;
Fig. 3 is according to the circuit diagram of the LED drive system of the utility model one embodiment;
Fig. 4 is according to the working waveform figure of LED drive system shown in Fig. 3 of the utility model one embodiment;
Fig. 5 is according to the circuit diagram of control circuit shown in Fig. 3 of the utility model one embodiment;
Fig. 6 is according to the working waveform figure of control circuit shown in Fig. 5 of the utility model one embodiment;
Fig. 7 is according to the circuit diagram of the LED drive system of another embodiment of the utility model;
Fig. 8 is according to the circuit diagram of control circuit shown in Fig. 7 of the utility model one embodiment;
Fig. 9 is according to the circuit diagram of the LED drive system of the another embodiment of the utility model; And
Figure 10 and Figure 11 are according to the working waveform figure of LED drive system shown in shown in Fig. 9 of the utility model one embodiment.
In the accompanying drawings, identical label is used to represent identical or corresponding element.
Embodiment
To describe specific embodiment of the utility model below in detail, it should be noted that the embodiments described herein, only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.But, it is evident that for those of ordinary skill in the art: needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.Those of ordinary skill in the art are known, and the utility model is not only applicable to driving LED, also can be used for driving other light-emitting component, such as CCFL etc.
Fig. 2 a is according to the block diagram of the light-emitting component driving system 200 of the utility model one embodiment.Light-emitting component driving system 200 comprises power conversion circuit 20, switch 21 and control circuit 22.Wherein power conversion circuit 20 receives input signal Vin and it is converted, so that first signal Uo1 and the secondary signal Uo2 that can be conditioned to be provided simultaneously.Input signal Vin can come from pfc circuit, also can come from other direct currents or AC power.Power conversion circuit 20 can be the power conversion circuit that shows current source characteristic, for example can comprise isolated current mode power inverters such as LLC controlled resonant converter, anti exciting converter, also can comprise the converter such as BOOST (boosting), the non-isolated current mode power inverters such as Buck-Boost (buck) converter.Power conversion circuit 20 can adopt pulse width modulation (PWM, pulse width modulation), pulse frequency modulated (PFM, pulse frequency modulation) etc. control method, its specific implementation can be peak current control, Average Current Control, hysteresis current control etc.First signal Uo1 and secondary signal Uo2 can be two-way voltage signal, two-way current signal Huo Yi road voltage signal one road current signal.It will be appreciated by those of ordinary skill in the art that first signal Uo1 can be voltage signal or current signal, secondary signal Uo2 can be also voltage signal or current signal simultaneously.In one embodiment, one end of capacitor C 1 receives first signal Uo1, and the other end of capacitor C 1 is coupled to systematically.In one embodiment, one end of capacitor C 2 receives secondary signal Uo2, and the other end of capacitor C 2 is coupled to systematically.Switch 21 is coupled between power conversion circuit 20 and first signal Uo1, and namely switch 21 is coupled between power conversion circuit 20 and capacitor C 1.Switch 21 can be for example the applicable switching tube arbitrarily such as bipolar junction transistor (BJT), junction field effect transistor (JFET), mos field effect transistor (MOSFET), insulated gate gate pole transistor (IGBT).In embodiment as shown in Figure 2 a, light-emitting component driving system 200 regulates first signal Uo1 and secondary signal Uo2 by control circuit 22 simultaneously.Control circuit 22 receives the feedback signal FBl that represents first signal Uo1 and the feedback signal FB2 that represents secondary signal Uo2, and is used for the control signal CTRL1 of control switch 21 and the control signal CTRL2 for power ratio control translation circuit 20 according to first signal Uo1 and secondary signal Uo2 generation.Switch 21 conducting and turn-off to regulate first signal Uo1 to the first reference value under the control of control signal CTRL1, power conversion circuit 20 regulates secondary signal Uo2 to the second reference value under the control of control signal CTRL2.In one embodiment, control circuit 22 produces control signal CTRL1 with control switch 21 according to the feedback signal FB1 that represents first signal Uo1, produces control signal CTRL2 with power ratio control translation circuit 20 according to the feedback signal FB2 that represents secondary signal Uo2 simultaneously.First signal Uo1 or secondary signal Uo2 can be used for driving light-emitting component.Light-emitting component can be for example LED, WLED or CCFL etc., below all describe as an example of LED example, but those of ordinary skill in the art should be realized that, other arbitrarily applicable light-emitting component be all suitable for.
Fig. 2 b is according to the block diagram of the LED drive system 200b of the utility model one embodiment, comprises power conversion circuit 20, switch 21 and control circuit 22b.Wherein power conversion circuit receives input signal Vin, and voltage signal Vo and the current signal ILED for driving LED are provided.Wherein switch 21 is coupled between power conversion circuit 20 and current signal ILED, and control circuit 22b regulates current signal ILED to current reference value by control switch 21, carrys out regulation voltage signal Vo to voltage reference value by power ratio control translation circuit 20.
In one embodiment, LED drive system 200b also comprises feedback network 23 and feedback network 24.Feedback network 23 is by sampled voltage signal Vo, output voltage feedback signal VFB.Feedback network 24 is by sample rate current signal ILED, output current feedback signal IFB.Feedback network 23 and/or feedback network 24 for example can comprise resistance pressure-dividing network, capacitance partial pressure network, also can comprise the applicable feedback circuit arbitrarily such as transformer, Hall element.
In embodiment as shown in Figure 2 b, LED drive system 200b is by control circuit 22b regulation voltage signal Vo and current signal ILED simultaneously.Control circuit 22b carrys out regulation voltage signal Vo by power ratio control translation circuit 20, and regulates current signal ILED by the conducting of control switch 21 with shutoff simultaneously.Control circuit 22b receiver voltage feedback signal VFB and current feedback signal IFB, and produce control signal CTRL1 and control signal CTRL2 according to voltage feedback signal VFB and current feedback signal IFB.In embodiment as shown in Figure 2 b, control circuit 22b comprises current compensation network 226, voltage compensation network 225, frequency control circuit 227 and pulse generating circuit 228.Current compensation network 226 received current feedback signal IFB according to the comparative result generation current compensating signal CMP_i of current feedback signal IFB and current reference signal Iref.Voltage compensation network 225 receiver voltage feedback signal VFB also produce voltage compensation signal CMP_v according to the comparative result of voltage feedback signal VFB and voltage reference signal Vref.Frequency control circuit 227 receiver voltage compensating signal CMP_v, and produce control signal CTRL2 with power ratio control translation circuit 20 according to voltage compensation signal CMP_v, thus regulation voltage signal Vo is to voltage reference value.Pulse generating circuit 228 received current compensating signal CMP_i, and produce conducting and the shutoff of control signal CTRL1 with control switch 21 according to current compensation signal CMP i, thus regulate current signal ILED to current reference value.
In one embodiment, LED drive system 200b also comprises intermittently dimming mode.In the time that dim signal DIM is effective, LED is lit, and LED has electric current to flow through, and in the time that dim signal DIM is invalid, LED no current flows through.In one embodiment, in the time that dim signal DIM is effective, switch 21 is periodically conducting and shutoff under the control of control signal CTRL1, and in the time that dim signal DIM is invalid, 21 maintenances of opening the light are turn-offed.In the embodiment shown in Fig. 2 b, pulse generating circuit 228 also receives dim signal DIM.In the time that dim signal DIM is effective, frequency control circuit 227 produces control signal CTRL2 with power ratio control translation circuit according to voltage compensation signal CMP_v, thereby regulation voltage signal Vo, pulse generating circuit 228 produces control signal CTRL1 with the periodic conducting of control switch 21 and shutoff according to current compensation signal CMP_i, thereby regulates current signal ILED.In the time that dim signal DIM is invalid, frequency control circuit 227 produces control signal CTRL2 with power ratio control translation circuit according to voltage compensation signal CMP_v, thus regulation voltage signal Vo, and control circuit 22b control switch 21 keeps turn-offing.Dim signal DIM for example can be produced by control circuit 22b, also can be produced by other circuit.
In one embodiment, frequency control circuit 227 also produces synchronizing signal Sync, for example, produce synchronizing signal Sync according to control signal CTRL2.Pulse generating circuit 228 receives synchronizing signal Sync, and produces conducting and the shutoff of control signal CTRL1 with control switch 21 according to current compensation signal CMP_i and synchronizing signal Sync.In one embodiment, pulse generating circuit 228 is according to the conducting moment of current compensation signal CMP_i control switch 21, according to the shutoff moment of synchronizing signal Sync control switch 21.In one embodiment, the frequency of control signal CTRL1 is relevant with the frequency of control signal CTRL2, for example the frequency of control signal CTRL1 is identical with the frequency of control signal CTRL2, and the frequency of control signal CTRL1 can be also the twice of the frequency of control signal CTRL2.
Fig. 2 c is according to the block diagram of the LED drive system 200c of the utility model one embodiment, comprises power conversion circuit 20, switch 21 and control circuit 22c.Wherein power conversion circuit 20 receives input signal Vin, and voltage signal Vo and the current signal ILED for driving LED are provided.Wherein switch 21 is coupled between power conversion circuit 20 and voltage signal Vo, control circuit 22c carrys out regulation voltage signal Vo to voltage reference value by control switch 21, for example 5V, regulates current signal ILED to current reference value by power ratio control translation circuit 20, for example 200mA.
In one embodiment, LED drive system 200c also comprises feedback network 23 and feedback network 24.Feedback network 23 is by sampled voltage signal Vo, output voltage feedback signal VFB.Feedback network 24 is by sample rate current signal ILED, output current feedback signal IFB.
In embodiment as shown in Figure 2 c, LED drive system 200c is by control circuit 22c regulation voltage signal Vo and current signal ILED simultaneously.Control circuit 22c regulates current signal ILED by power ratio control translation circuit 20, and carrys out regulation voltage signal Vo by the conducting of control switch 21 with shutoff simultaneously.Control circuit 22c receiver voltage feedback signal VFB and current feedback signal IFB, and produce control signal CTRL1 and control signal CTRL2 according to voltage feedback signal VFB and current feedback signal IFB.In embodiment as shown in Figure 2 c, control circuit 22c comprises current compensation network 221, voltage compensation network 222, frequency control circuit 223 and pulse generating circuit 224.Current compensation network 221 received current feedback signal IFB according to the comparative result generation current compensating signal CMP_i of current feedback signal IFB and current reference signal Iref.Voltage compensation network 222 receiver voltage feedback signal VFB also produce voltage compensation signal CMP_v according to the comparative result of voltage feedback signal VFB and voltage reference signal Vref.Frequency control circuit 223 received current compensating signal CMP_i, and produce control signal CTRL2 with power ratio control translation circuit 20 according to current compensation signal CMP_i, thus regulate current signal ILED to current reference value.Pulse generating circuit 224 receiver voltage compensating signal CMp_v, and produce control signal CTRL1 with control switch 21 according to voltage compensation signal CMP_v, thus regulation voltage signal Vo is to voltage reference value.
In one embodiment, LED drive system 200c also comprises intermittently dimming mode.In the time that dim signal DIM is effective, LED is lit, for example switch 25 conductings, and LED has electric current to flow through, and in the time that dim signal DIM is invalid, LED no current flows through, and for example switch 25 turn-offs.In the embodiment shown in Fig. 2 c, frequency control circuit 223 also receives dim signal DIM and voltage compensation signal CMP_v, and pulse generating circuit 224 also receives dim signal DIM.In the time that dim signal DIM is effective, frequency control circuit 223 produces control signal CTRL2 with power ratio control translation circuit 20 according to current compensation signal CMP_i, thereby regulate current signal ILED, pulse generating circuit 224 produces control signal CTRL1 with the periodic conducting of control switch 21 and shutoff according to voltage compensation signal CMP_v, thus regulation voltage signal Vo.In the time that dim signal DIM is invalid, switch 21 keeps conducting, and frequency control circuit 223 produces control signal CTRL2 with power ratio control translation circuit 20 according to voltage compensation signal CMP_v, thus regulation voltage signal Vo.Dim signal DIM for example can be produced by control circuit 22c, also can be produced by other circuit.
In one embodiment, frequency control circuit 223 also produces synchronizing signal Sync, for example, produce synchronizing signal Sync according to control signal CTRL2.Pulse generating circuit 224 receives synchronizing signal Sync, and produces conducting and the shutoff of control signal CTRL1 with control switch 21 according to voltage compensation signal CMP_v and synchronizing signal Sync.In one embodiment, pulse generating circuit 224 is according to the conducting moment of voltage compensation signal CMP_v control switch 21, according to the shutoff moment of synchronizing signal Sync control switch 21.In one embodiment, the frequency of control signal CTRL1 is relevant with the frequency of control signal CTRL2, for example the frequency of control signal CTRL1 is identical with the frequency of control signal CTRL2, and the frequency of control signal CTRL1 can be also the twice of the frequency of control signal CTRL2.
Embodiment as shown in Fig. 2 a～2c has realized simultaneously two paths of signals, and for example current signal ILED and voltage signal Vo regulate, and have solved the unstable and interference problem there will be simultaneously provide two paths of signals from single-level circuit time.Thereby the signal that the light-emitting component driving system shown in Fig. 2 a～2c only needs single-stage power conversion circuit can provide two-way to be conditioned, when simple in structure and low in cost, can ensure the accuracy of this two paths of signals simultaneously.
Fig. 3 is according to the circuit diagram of the LED drive system 300 of the utility model one embodiment, and wherein power conversion circuit comprises by primary circuit 303, transformer T1, the first rectification circuit 304 and the second rectification circuit 305.LED drive system 300 also comprises control circuit 306, buffer circuit 307, input capacitance Cin, output capacitance C1, C2, and switch S 3.Transformer T1 has an armature winding and two secondary winding.Primary circuit 303 adopts LLC resonant transformation topology, comprise switch S 1, S2 and capacitor C 1, primary circuit 303 receives input signal Vin, and conducting by switch S 1 and S2 is converted to an AC signal by input signal Vin and provides to the armature winding of transformer T1 with turn-offing.The magnetizing inductance of capacitor C 1, transformer T1 armature winding and leakage inductance form LLC resonant circuit.Input capacitance Cin electric coupling is between two inputs of primary circuit 303.In other embodiments, primary circuit 303 can be such as flyback constant power translation circuit.
The first rectification circuit 304 is electrically coupled to a secondary winding of transformer T1, and the voltage at these secondary winding two ends is carried out to rectification, so that the current signal ILED of driving LED to be provided.The second rectification circuit 305 is electrically coupled to another secondary winding of transformer T1, and the voltage at these secondary winding two ends is carried out to rectification, so that voltage signal Vo to be provided.The first rectification circuit 304 and the second rectification circuit 305 can be half-wave, all-wave or full bridge rectifier.Output capacitance C1 and C2 difference electric coupling are between two outputs of the first rectification circuit 304 and the second rectification circuit 305.Switch S 3 electric couplings are between output and an output of output capacitance C1 of the first rectification circuit 304.
In one embodiment, in the time that dim signal DIM is invalid, switch S 3 is turned off so that the first rectification circuit 304 stops output capacitance C1 to power; Under normal circumstances, when dim signal DIM is effective, the periodic conducting of switch S 3 and shutoff are to regulate current signal ILED.In one embodiment, in the time that the first rectification circuit 304 or LED break down, switch S 3 is turned off so that the first rectification circuit 304 stops output capacitance C1 to power.The first rectification circuit 304 breaks down and for example can comprise overvoltage fault or overcurrent fault, and LED fault for example can comprise overcurrent.In one embodiment, in the time that switch S 3 is turned off, primary circuit 303 and the second rectification circuit 305 are normally worked.In one embodiment, in the time that the second rectification circuit 305 breaks down, primary circuit 303 turn-offs, and LED drive system 300 quits work.
Fig. 4 is the working waveform figure of LED drive system 300 shown in Fig. 3, wherein drive signal S1_Drv, S2_Drv and S3_Drv to be high level effective, the switching frequency Fs (the namely switching frequency of switch S 1 or switch S 2) of LLC controlled resonant converter 303 is less than the resonance frequency Fr of LLC.The resonance frequency Fr of LLC is the resonance frequency that resonant inductance and capacitor C 1 resonance produce.Fig. 4 is followed successively by from top to bottom primary current Ip, secondary current sum Is1+Is2, drives signal S1_Drv, drives signal S2_Drv and drives signal S3_Drv.As shown in Figure 4, the complementary conducting under the control that drives signal S1_Drv and driving signal S2Drv of switch S 1 and switch S 2, wherein drive signal S1_Drv and drive between signal S2_Drv to be provided with Dead Time, to prevent that switch S 1 and switch S 2 conductings simultaneously from damaging circuit.In one embodiment, according to the conducting moment of current feedback signal IFB control switch S3, according to the shutoff moment of the shutoff control switch S3 of switch S 1 and switch S 2.As shown in Figure 4, in the T1 moment, drive signal S1_Drv to become low level and turn-off with control switch S1, turn-off with control switch S3 thereby drive signal S3_Drv to become low level, now the summation Is1+Is2 of transformer T1 secondary current is zero, and switch S 3 can realize zero-current switching.In the T2 moment, drive signal S2_Drv to become low level and turn-off with control switch S2, turn-off with control switch S3 thereby drive signal S3_Drv to become low level, now the summation Is1+Is2 of transformer T1 secondary current is zero, switch S 3 can realize zero-current switching.Switch S 3 is turn-offed in the time that switch S 1 or switch S 2 are turn-offed, and can better simplyly realize zero-current switching, thereby reduce switching loss and reduced the voltage stress in switch S 3, has improved system effectiveness.In the time that switch S 1 or switch S 2 are turn-offed, the summation of transformer T1 secondary current is zero, thereby can realize the zero-current switching of the first rectification circuit 304 and the second rectification circuit 305, can eliminate the loss that electric current produces in the leakage inductance of two secondary winding of transformer T1 simultaneously.
Fig. 5 is the circuit diagram of control circuit 306 shown in Fig. 3, comprises the voltage-regulation loop being made up of voltage compensation network 51 and frequency control circuit 52, and the current regulation loops being made up of current compensation network 54 and pulse generating circuit 55.In the embodiment shown in fig. 5, also comprise drive circuit 53 and drive circuit 56.Voltage-regulation loop produces conducting and the shutoff of control signal CTRL2 with control switch S1 and switch S 2 according to voltage feedback signal VFB, and current regulation loops produces conducting and the shutoff of control signal CTRL1 with control switch S3 according to current feedback signal IFB simultaneously.Voltage compensation network 51 receives the voltage feedback signal VFB of representative voltage signal Vo, and produces voltage compensation signal CMP_v according to the comparative result of voltage feedback signal VFB and voltage reference signal Vref.Frequency control circuit 52 receiver voltage compensating signal CMP_v, and produce conducting and the shutoff of control signal CTRL2 with control switch S1 and switch S 2 according to voltage compensation signal CMP_v, frequency control circuit 52 for example can adopt pulse frequency modulated method.In one embodiment, frequency control circuit 52 is according to the frequency of voltage compensation signal CMP_v modulator control signal CTRL2, for example the frequency of control signal CTRL2 increases along with the increase of voltage compensation signal CMP_v, reduces along with reducing of voltage compensation signal CMP_v.Frequency control circuit 52 for example can charge to a capacitor by voltage compensation signal CMP_v, increases to the frequency of the time modulator control signal CTRL2 of a set point according to the voltage at capacitor two ends.In one embodiment, drive signal S1_Drvl and drive signal S1_Drvl to there is fixing duty ratio, for example 50%, namely drive signal S1_Drvl and drive signal S1_Drvl to equal in the low level time in the time of high level.Those of ordinary skill in the art should be realized that, applicable pulse frequency modulated method all can be suitable for arbitrarily.In one embodiment, frequency control circuit 52 produces synchronizing signal Snyc according to control signal CTRL2.For example, when control signal CTRL2 becomes when invalid, synchronizing signal Snyc becomes effectively.Drive circuit 53 reception control signal CTRL2 also produce in order to the driving signal S1_Drvl of control switch S1 with in order to the driving signal S2_Drvl of control switch S2.Current compensation network 54 receives the current feedback signal IFB that represents current signal ILED, and according to the comparative result generation current compensating signal CMP_i of current feedback signal IFB and current reference signal Iref.In one embodiment, pulse generating circuit 55 is according to the conducting moment of current compensation signal CMP_i control switch S3, and according to the shutoff moment of the shutoff moment control switch S3 of switch S 1 or switch S 2, for example, in the time that switch S 1 or switch S 2 are turn-offed, control switch S3 turn-offs.In one embodiment, pulse generating circuit 55 received current compensating signal CMP_i and synchronizing signal Sync, and produce conducting and the shutoff of control signal CTRL1 with control switch S3 according to current compensation signal CMP_i and synchronizing signal Sync.In one embodiment, pulse generating circuit 55 is according to the conducting of current compensation signal CMP_i control switch S3, according to the shutoff of synchronizing signal Snyc control switch S3.In one embodiment, in the time that control signal CTRL2 control switch S1 or switch S 2 are turn-offed, synchronizing signal Sync becomes effectively, and pulse generating circuit 55 control switch S3 turn-off.Drive circuit 56 reception control signal CTRL1 also produce the driving signal S3_Drv in order to control switch S3.In one embodiment, drive circuit 56 also receives dim signal DIM, in the time that dim signal DIM is effective, drive signal S3_Drv effective, switch S 3 is periodically conducting and shutoff under the control of control signal CTRL1, in the time that dim signal DIM is invalid, drive signal S3_Drv invalid, switch S 3 keeps turn-offing.In one embodiment, drive circuit 56 also receives fault-signal Fault_LED, in the time that fault-signal Fault_LED indicates the first rectification circuit 304 or LED to break down, drives signal S3_Drv invalid, and switch S 3 keeps turn-offing.
In the embodiment shown in fig. 5, voltage compensation network 51 comprises amplifier AMP1, and voltage feedback signal VFB is admitted to the inverting input of amplifier AMP1, and Vref compares with voltage reference signal, and produces voltage compensation signal CMP_v according to comparative result.Frequency control circuit 52 produces the switching frequency of control signal CTRL2 with by-pass cock S1 and switch S 2 according to voltage compensation signal CMP_v.Current compensation network 54 comprises amplifier AMP2, and current feedback signal IFB is admitted to the inverting input of amplifier AMP2, and Iref compares with current reference signal, and according to comparative result generation current compensating signal CMP_i.Pulse generating circuit 55 produces the duty ratio of control signal CTRL1 with by-pass cock S3 according to current compensation signal CMP_i.In one embodiment, the switching frequency of switch S 3 is twices of the switching frequency of switch S 1 or switch S 2, and wherein switch S 1 and switch S 2 have identical switching frequency.
Fig. 6 is the work wave of control circuit shown in Fig. 5, wherein dim signal DIM, drive signal S1_Drv and drive signal S3_Drv to be high level effective.In the embodiment shown in fig. 5, in the time that dim signal DIM is high level, drive the signal S3_Drv periodic conducting of control switch S3 and shutoff; In the time that dim signal DIM is low level, driving signal S3_Drv is that low level keeps turn-offing with control switch S3, and LLC resonant transform circuit 303 stops as LED provides electric current, and current signal ILED is zero.Drive signal S1_Drv and for example drive signal S2_Drv (not shown), with high-frequency impulse (50kHz) control switch S1 and the periodic conducting of switch S 2 and turn-off with regulation voltage signal Vo.
Fig. 7 is that its basic structure is similar to drive system shown in Fig. 3 according to the circuit diagram of the LED drive system 700 of another embodiment of the utility model.Wherein the first rectification circuit 704 is full-wave rectifying circuit, and the second rectification circuit 705 is full bridge rectifier, and buffer circuit 707 is transformer device structure, and switch S 3 is PMOS, and switch S 4 is NMOS.In one embodiment, switch S 3 can be also any other suitable switchtype, for example NMOS, and switch S 4 can be also any other suitable switchtype, for example PMOS.Control circuit 706 receive the first rectification circuit 704 output voltage V _ LED, represent the first rectification circuit 704 output currents feedback signal ISSD_fb, represent the current feedback signal IFB of the electric current of driving LED, the output voltage VO of the second rectification circuit 705, and represent the feedback signal I2_fb of the second rectification circuit 705 output currents, produce and drive signal S1_Drv, S2_Drv conducting and the shutoff with control switch S1 and switch S 2 according to these signals, and produce and drive signal S3_Drv and S4_Drv conducting and the shutoff with control switch S3 and switch S 4.
Voltage feedback signal VFB is admitted to the inverting input of amplifier AMP3, to compare with voltage reference signal Vref, and according to generation voltage compensation signal CMP_v.Current feedback signal IFB is admitted to the inverting input of amplifier AMP4, to compare with current reference signal Iref, and according to generation current compensating signal CMP_i.Frequency control circuit 811 receiver voltage compensating signal CMP_v, and produce control signal CTRL2 according to voltage compensation signal CMP_v, with conducting and the shutoff of control switch S1 and S2.Frequency control circuit 811 also produces synchronizing signal Sync according to voltage compensation signal CMP_v or control signal CTRL2.Pulse generating circuit 812 received current compensating signal CMP_i and synchronizing signal Sync, and produce conducting and the shutoff of control signal CTRL1 with control switch S3 according to current compensation signal CMP_i and synchronizing signal Sync.In one embodiment, pulse generating circuit 812 is according to the conducting moment of current compensation signal CMP_i control switch S3, according to the shutoff moment of synchronizing signal Sync control switch S3.In one embodiment, pulse generating circuit 812 also comprises synchronous circuit 8121, and synchronous circuit 8121 is according to the switching frequency of synchronizing signal Sync control switch S3, and the switching frequency that makes switch S 3 is the twice of the switching frequency of switch S 1 or switch S 2.
Signal IFB is also admitted to the in-phase input end of comparator C MP3, to compare with threshold signal Vth_OCPL, so that overcurrent condition protection is appearred in the electric current that flows through LED.Signal ISSD-fb is admitted to the inverting input of comparator C MP4, to compare with threshold signal Vth_SSD, the output of the first rectification circuit 704 is occurred to short circuit or overcurrent condition protect.Signal VLED_fb is admitted to the in-phase input end of comparator C MP5, to compare with threshold signal Vth_OVPL, protects with output appearance open circuit or overpressure situation to the first rectification circuit 704.Or door OR2 receives the output signal of comparator C MP3～5, and whether the break down fault-signal Fault_LED of (short circuit, overcurrent or overvoltage) of the output or the LED that produce instruction the first rectification circuit 704.
Drive signal generation circuit 813 receives fault-signal Fault1 and control signal CTRL2, and produces and drive signal with driving switch S1 and S2 according to these two signals.For example, when effectively (high level) of fault-signal Faultl, when the output of instruction the second rectification circuit 705 is broken down, drive signal generation circuit 813 turn-offs switch S 1 and S2.Drive signal generation circuit 815 receives fault-signal Fault1, fault-signal Fault_LED, dim signal DIM and control signal CTRL1, and produces and drive signal S3_Drv with driving switch S3 according to these four signals.For example, when fault-signal Fault1 or effectively (high level) of fault-signal Fault_LED, when the instruction output of the first rectification circuit 704 or the output of the second rectification circuit 705 are broken down, drive signal generation circuit 815 turn-offs switch S 3.In the time that dim signal DIM is effective, according to the periodic conducting of control signal CTRL1 control switch S3 and shutoff, in the time that dim signal DIM is invalid, stopcock S3.
Intermittently light adjusting circuit 814 receives dimming control signal DBRT and fault-signal Fault_LED, and produces dim signal DIM according to these two signals.For example, when effectively (high level) of fault-signal Fault_LED, when the output of instruction the first rectification circuit 704 is broken down, intermittently light adjusting circuit 814 is exported invalid dim signal DIM.Dimming control signal DBRT can be DC level signal or pwm signal.
Dimmer switch drive circuit 816 receives fault-signal Fault_LED and dim signal DIM, and produces and drive signal S4_Drv with driving switch S4 according to these two signals respectively.In the time that fault-signal Fault_LED is effective or dim signal DIM is invalid, dimmer switch drive circuit 816 control switch S4 turn-off.
Fig. 9 is according to the circuit diagram of the LED drive system 900 of the another embodiment of the utility model, and wherein power conversion circuit comprises the isolated power conversion circuit that primary circuit 903, transformer T2, the first rectification circuit 904 and the second rectification circuit 905 form.Wherein primary circuit 903 adopts inverse-excitation type transformation topology, comprises switch S, receives input signal Vin, and conducting by switch S is converted to an AC signal by input signal Vin and provides to the armature winding of transformer T2 with turn-offing.LED drive system 900 also comprises switch S 5, control circuit 906, buffer circuit 907 and 908.The first rectification circuit 904 is coupled to a secondary winding of transformer T2, and the voltage at these secondary winding two ends is carried out to rectification, so that voltage signal Vo to be provided.Voltage signal Vo can, for LED power supply, can be for example also other circuit supply.Voltage signal Vo can, directly as the supply power voltage of other circuit, also can obtain other voltage signal through DC/DC translation circuit in one embodiment.The second rectification circuit 905 is coupled to another secondary winding of transformer T2, and the voltage at these secondary winding two ends is carried out to rectification, so that current signal ILED driving LED to be provided.Output capacitance C1 and C2 difference electric coupling are between two outputs of the first rectification circuit 904 and the second rectification circuit 905.Switch S 5 electric couplings are between an output of output capacitance C2 and the second rectification circuit 905.
Figure 10 and Figure 11 be shown in Fig. 9 shown in the working waveform figure of LED drive system 900.Wherein primary circuit 903 is done in discontinuous mode.Figure 10 is followed successively by from top to bottom and drives signal S-Drv, primary current Ip, secondary current sum Is1+Is2 and drive signal S5_Drv, and shown in Figure 10, driving signal S-Drv and S5_Drv is that high level is effective.In one embodiment, according to the conducting moment of current feedback signal IFB control switch S5, according to the shutoff moment of the conducting moment control switch S5 of switch S.As shown in figure 10, in the T3 moment, drive signal S_Drv to become high level with control switch S conducting, thereby drive signal S5_Drv to become low level from high level, turn-off with control switch S5.During due to switch S conducting, secondary current sum Is1+Is2 is zero, and in the time of switch S conducting, stopcock S5 can better simplyly realize the zero-current switching of switch S 5, thereby reduces switching loss, improves electric energy service efficiency.Figure 11 is followed successively by from top to bottom dim signal DIM, drives signal S_Drv, drives signal S5_Drv, current signal ILED and voltage signal Vo, and it is effective that the DIM of dim signal shown in Figure 11, driving signal S_Drv and S5_Drv are high level.In one embodiment, in the time that dim signal DIM is high level, drives the signal S5_Drv periodic conducting of control switch S5 and turn-off to regulate current signal ILED; In the time that dim signal DIM is low level, driving signal S5_Drv is that low level keeps turn-offing with control switch S5, and primary circuit 903 stops as LED provides electric current, and current signal ILED is zero.Drive the S periodicity conducting of signal S_Drv control switch and turn-off with regulation voltage signal Vo.
Although described the utility model with reference to several exemplary embodiments, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not depart from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (13)
1. a light-emitting component driving system, is characterized in that, described light-emitting component driving system comprises:
Power conversion circuit, receives input signal and it is converted, so that first signal and the secondary signal that can be conditioned to be provided simultaneously;
The first switch, is coupled between power conversion circuit and first signal; And
Control circuit, comprise the first compensating network and the second compensating network, wherein the first compensating network produces the first compensating signal according to representing that the feedback signal of first signal and the first reference signal are compared, and the second compensating network produces the second compensating signal according to representing that the feedback signal of secondary signal and the second reference signal are compared; Wherein
In the time that dim signal is effective, according to first compensation signal control the first switch, and according to the second compensation signal control power conversion circuit.
2. light-emitting component driving system as claimed in claim 1, is characterized in that, wherein secondary signal is used for driving light-emitting component.
3. light-emitting component driving system as claimed in claim 2, is characterized in that, wherein, in the time that dim signal is invalid, control circuit control the first switch keeps conducting, and according to the first compensation signal control power conversion circuit.
4. light-emitting component driving system as claimed in claim 2, is characterized in that, described control circuit also comprises:
Pulse generating circuit, receive the first compensating signal and dim signal and produce the first control signal, wherein in the time that dim signal is effective, produce the first control signal to control conducting and the shutoff of the first switch according to the first compensating signal, in the time that dim signal is invalid, controls the first switch and keep conducting; And
Frequency control circuit, receive the first compensating signal, the second compensating signal and dim signal and produce the second control signal, wherein in the time that dim signal is effective, produce the second control signal with power ratio control translation circuit according to the second compensating signal, in the time that dim signal is invalid, produce the second control signal with power ratio control translation circuit according to the first compensating signal.
5. light-emitting component driving system as claimed in claim 1, is characterized in that, wherein first signal is used for driving light-emitting component.
6. light-emitting component driving system as claimed in claim 5, is characterized in that, wherein, in the time that dim signal is invalid, control circuit control the first switch keeps turn-offing, and according to the second compensation signal control power conversion circuit.
7. light-emitting component driving system as claimed in claim 1, is characterized in that, described control circuit also comprises:
Pulse generating circuit, receives the first compensating signal and produces the first control signal to control conducting and the shutoff of the first switch; And
Frequency control circuit, receives the second compensating signal and produces the second control signal with power ratio control translation circuit according to the second compensating signal.
8. light-emitting component driving system as claimed in claim 7, it is characterized in that, wherein frequency control circuit also produces synchronizing signal, pulse generating circuit receives described synchronizing signal, and according to the conducting moment of first compensation signal control the first switch, according to the shutoff moment of described synchronizing signal control the first switch.
9. light-emitting component driving system as claimed in claim 7, it is characterized in that, wherein pulse generating circuit also receives dim signal, in the time that dim signal is effective, produce the first control signal to control conducting and the shutoff of the first switch according to the first compensating signal, in the time that dim signal is invalid, controls the first switch and keep conducting or keep turn-offing.
10. light-emitting component driving system as claimed in claim 1, is characterized in that, wherein said power conversion circuit comprises:
Primary circuit, comprises at least one switch, receives input signal, and with shutoff, input signal is converted to AC signal by the conducting of described at least one switch;
Transformer, comprise armature winding, the first secondary winding and second subprime winding, described armature winding is coupled to primary circuit to receive AC signal, and described transformer converts AC signal and provides respectively conversion rear signal by described the first secondary winding and described second subprime winding;
The first rectification circuit, is electrically coupled to the first secondary winding, and to receive after the conversion of the first secondary winding output signal and to carry out rectification so that first signal to be provided, wherein the first switch is coupled between the first rectification circuit and first signal; And
The second rectification circuit, is electrically coupled to second subprime winding, to receive after the conversion of second subprime winding output signal and to carry out rectification so that secondary signal to be provided; Wherein
Control circuit is according to conducting and the shutoff of at least one switch described in the second compensation signal control, according to the conducting moment of first compensation signal control the first switch, and according to the conducting moment of described at least one switch or turn-off the moment and control shutoff moment of the first switch.
11. light-emitting component driving systems as claimed in claim 1, is characterized in that, wherein said power conversion circuit comprises LLC controlled resonant converter, comprising:
Primary circuit, comprise second switch, the 3rd switch and resonant capacitance, wherein the first end of second switch receives described input signal, the first end of the 3rd switch is coupled to the second end of second switch, the second end of the 3rd switch is coupled to systematically, and the first end of resonant capacitance is coupled to the second end of second switch and the first end of the 3rd switch;
Transformer, comprises armature winding, the first secondary winding and second subprime winding, and described armature winding is coupled to the second end of resonant capacitance;
The first rectification circuit, is electrically coupled to the first secondary winding so that first signal to be provided, and wherein the first switch is coupled between the first rectification circuit and first signal; And
The second rectification circuit, is electrically coupled to second subprime winding so that secondary signal to be provided; Wherein
Control circuit is according to conducting and the shutoff of the second compensation signal control second switch and the 3rd switch, according to the conducting moment of first compensation signal control the first switch, and controls shutoff moment of the first switch according to the shutoff moment of second switch or the 3rd switch.
12. 1 kinds of driving control circuit for light-emitting component, is characterized in that, described driving control circuit for light-emitting component comprises:
Voltage compensation network, by the feedback signal of representative voltage signal and voltage reference signal comparison, and produces voltage compensation signal according to comparative result;
Current compensation network, flows through representative feedback signal and the current reference signal comparison of the electric current of light-emitting component, and according to comparative result generation current compensating signal;
Pulse generating circuit, receiver voltage compensating signal and dim signal, wherein, in the time that dim signal is effective, produce the first control signal to regulate described voltage signal according to voltage compensation signal; And
Frequency control circuit, receiver voltage compensating signal, current compensation signal and dim signal, wherein in the time that dim signal is effective, produce the second control signal to flow through the electric current of light-emitting component described in regulating according to current compensation signal, in the time that dim signal is invalid, produce the second control signal to regulate described voltage signal according to voltage compensation signal.
13. 1 kinds of driving control circuit for light-emitting component, is characterized in that, described driving control circuit for light-emitting component comprises:
Voltage compensation network, by the feedback signal of representative voltage signal and voltage reference signal comparison, and produces voltage compensation signal according to comparative result;
Current compensation network, flows through representative feedback signal and the current reference signal comparison of the electric current of light-emitting component, and according to comparative result generation current compensating signal;
Pulse generating circuit, received current compensating signal and dim signal, wherein in the time that dim signal is effective, produce the first control signal to flow through the electric current of light-emitting component described in regulating according to current compensation signal; And
Frequency control circuit, receiver voltage compensating signal, and produce the second control signal to regulate described voltage signal according to voltage compensation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420040181.6U CN203675399U (en) | 2014-01-22 | 2014-01-22 | Light-emitting element driving system and driving control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420040181.6U CN203675399U (en) | 2014-01-22 | 2014-01-22 | Light-emitting element driving system and driving control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203675399U true CN203675399U (en) | 2014-06-25 |
Family
ID=50971642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420040181.6U Expired - Fee Related CN203675399U (en) | 2014-01-22 | 2014-01-22 | Light-emitting element driving system and driving control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203675399U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793322A (en) * | 2016-12-30 | 2017-05-31 | 深圳Tcl数字技术有限公司 | Led drive circuit |
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
-
2014
- 2014-01-22 CN CN201420040181.6U patent/CN203675399U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793322A (en) * | 2016-12-30 | 2017-05-31 | 深圳Tcl数字技术有限公司 | Led drive circuit |
| CN106793322B (en) * | 2016-12-30 | 2020-05-19 | 深圳Tcl数字技术有限公司 | LED drive circuit |
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| CN112785971B (en) * | 2020-03-18 | 2022-03-18 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103763830B (en) | Light-emitting component driving system, driving control circuit and driving method | |
| CN102098853B (en) | Light emitting element driving system, driving control circuit and driving method | |
| US10181796B2 (en) | Control method and device for quasi-resonant high-power-factor flyback converter | |
| KR101931448B1 (en) | System and method for a startup cell circuit | |
| US9907130B2 (en) | High-efficiency LED driver and driving method | |
| US9960686B2 (en) | System and method for detecting a loss of AC power in a switched-mode power supply | |
| CN105991050B (en) | Method and apparatus for High Power Factor flyback converter | |
| US8125158B2 (en) | Insulation type AC-DC converter and LED DC power supply device using the same | |
| CN202856643U (en) | Independently-controlled cascaded boost and inverting buck converter | |
| US9232606B2 (en) | Switch-mode power supply, control circuit and associated dimming method | |
| CN102523650B (en) | Light-emitting diode (LED) current detection and control circuit | |
| US10241322B2 (en) | Device and method for quasi-resonant-mode voltage control of a switching converter | |
| CN102548089B (en) | Multi-channel light adjustable light-emitting diode driving power source | |
| US9030049B2 (en) | Alternating current (AC) to direct current (DC) converter device | |
| CN201893980U (en) | Multipath dimming light-emitting diode drive power supply | |
| CN102065600A (en) | LED dimming driving system | |
| CN203675399U (en) | Light-emitting element driving system and driving control circuit | |
| CN203352889U (en) | LED driving device and control circuit thereof | |
| CN101896027B (en) | Method and circuit for controlling multi-path current distribution of LED power supply | |
| Malschitzky et al. | Integrated bridgeless-boost nonresonant half-bridge converter employing hybrid modulation strategy for LED driver applications | |
| CN104467424A (en) | Switching power supply for display panel | |
| CN110769173B (en) | Television power supply system and television | |
| CN104767404B (en) | Ultra-high voltage regulator | |
| KR101454158B1 (en) | Electrolytic Capacitor-less Power Supply for Lighting LED Drive and 120Hz Ripple Reduction Method of the Same | |
| Naraharisetti et al. | Primary side regulated flyback AC-DC converter for LED's |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20170122 |