CN105357794B - System for providing from output current to one or more light emitting diodes - Google Patents
System for providing from output current to one or more light emitting diodes Download PDFInfo
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- CN105357794B CN105357794B CN201510705470.2A CN201510705470A CN105357794B CN 105357794 B CN105357794 B CN 105357794B CN 201510705470 A CN201510705470 A CN 201510705470A CN 105357794 B CN105357794 B CN 105357794B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
There is provided a kind of system for being used to provide output current to one or more light emitting diodes, including：Switch control assembly, it is configured as basis and sensing signal, demagnetization signal, and the associated information generation control signal of reference signal, and using the control signal come the cut-off and conducting of control system power switch, wherein described system power switch is connected to the first diode terminal of diode and the first inductor terminals of inductor, the diode also includes the second diode terminal, the inductor also includes the second inductor terminals, and one or more of light emitting diodes and output capacitance are connected in parallel between second diode terminal and second inductor terminals, the sensing signal is that the electric current for flowing through the system power switch by sensing is generated, the demagnetization signal is that the electric current for flowing through the inductor by sensing is generated, and the reference signal is prearranged signals.
Description
Technical field
The present invention relates to circuit field, relate more specifically to a kind of be used for the offer output of one or more light emitting diodes
The system of electric current.
Background technology
At present, light emitting diode (LED) lighting engineering has reached its maturity.LED is due to luminous efficiency height, service life
Long the features such as, it is widely used to replace traditional incandescent lamp in lighting field.But, when replacing incandescent lamp using LED, due to
LED drive circuit is not typically high without over-voltage protecting function or overvoltage protection precision, causes LED drive circuit easily to be damaged
Go bad or can not be efficiently utilized.In order to realize high-precision overvoltage protection, it is necessary to increase the periphery of complexity in LED drive circuit
Circuit, on the other hand this aspect cost is high to cause its printed circuit size big, it is impossible to be directly placed into lamp holder joints.
The content of the invention
One or more problems in view of the above, are used for one or more hairs the invention provides a kind of novel
Optical diode provides the system of output current and controlled
The method of the output voltage of system.
System for providing from output current to one or more light emitting diodes according to embodiments of the present invention includes：Open
Control assembly is closed, is configured as according to the information generation control letter associated with sensing signal, demagnetization signal and reference signal
Number, and using the control signal come the cut-off and conducting of control system power switch, wherein system power switch is connected
The first diode terminal of diode and the first inductor terminals of inductor are connected to, the diode also includes the second diode
Terminal, the inductor also includes the second inductor terminals, and one or more of light emitting diodes and output capacitance are simultaneously
Connection is connected between second diode terminal and second inductor terminals, and the sensing signal is flowed through by sensing
The electric current generation of the system power switch, the demagnetization signal is that the electric current for flowing through the inductor by sensing is generated
, and the reference signal is prearranged signals.
Control according to embodiments of the present invention is used for the system to one or more light emitting diodes offer output current
The method of output voltage includes：The control signal whether in running order using one or more of light emitting diodes are characterized
Generate voltage sense signal；The voltage that the voltage that the voltage sense signal is indicated is indicated with reference signal is carried out
Compare, and judge whether the output voltage of the system is higher than scheduled voltage according to comparative result；In the output of the system
In the case that voltage is higher than scheduled voltage, the system power closed using the control signal in the system is switched.
The system from output current to one or more light emitting diodes and the control that are used to provide according to embodiments of the present invention
High accuracy can be provided by making the method for the output voltage of the system for providing output current to one or more light emitting diodes
Over-voltage protecting function.
Brief description of the drawings
From below in conjunction with the accompanying drawings to the present invention embodiment description in the present invention may be better understood, its
In：
Fig. 1 is the electricity for being traditionally used for providing the system (BUCK circuits) of output current to one or more light emitting diodes
Lu Tu；
Fig. 2 is the system for being used to provide output current to one or more light emitting diodes according to embodiments of the present invention
Circuit diagram；
Fig. 3 is the working waveform figure in the circuit system shown in Fig. 2；
Fig. 4 is the circuit diagram of overvoltage protection (OVP) module in the circuit system shown in Fig. 2.
Embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But, to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is used for the purpose of by showing that the example of the present invention is better understood to provide to the present invention.The present invention is never limited
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of part and algorithm.In the the accompanying drawings and the following description, known structure and skill is not shown
Art, to avoid causing the present invention unnecessary obscure.
In order that LED brightness constancy, generally provides substantially invariable electric current to LED.Fig. 1 is traditionally used for one
Or multiple light emitting diodes provide the circuit diagram of the system (BUCK circuits) of output current.
As shown in figure 1, including AC rectification for the system 100 that output current is provided to one or more light emitting diodes
Component 102, controller assemblies 104 and electric current output precision 106.Specifically, exchange whole when one or more LED are connected to
When between two connection ends of stream component 102：AC rectification component 102 receives AC-input voltage VAC, and exchange input is electric
Press VACIt is transformed to DC voltage VBULK, to provide electric current to one or more LED.Controller assemblies 104 by GATE terminals to
System power in electric current output precision 106 switchs 1062 output control signals, with the conducting of control system power switch 1062
With cut-off, so as to adjust the electric current (or for output current) for flowing through one or more LED.When system power switch 1062 is turned on
When, the electric current of inductor 1064 in electric current output precision 106 is flowed through by the sense resistor 1066 in electric current output precision 106
Sense, so that current sensing signal is arrived by controller assemblies 104 by CS terminal receptions.It is used as response, controller group
Part 104 generates control signal according to current sensing signal, with the conducting and cut-off of control system power switch 1062.When system work(
When rate switch 1062 ends, inductor 1064, diode 1068 in electric current output precision 106 and to be connected to electric current defeated
Go out between one or more LED between two output ends of component 106 and form current loop.
In the system shown in figure 1, when LED from two output ends of electric current output precision 106 it is separated when (that is, two
During individual output end open circuit) or LED failure when can not work, it is defeated between two output ends of electric current output precision 106
Go out voltage VOUTCan be too high (for example, equal to or more than the output being connected between two output ends of electric current output precision 106
Electric capacity COUTRated voltage), so as to cause the output capacitance C in electric current output precision 106OUTEasily it is damaged.
It is therefore desirable to when two output ends open circuit for electric current output precision 106 is provided in the system shown in figure 1
Overvoltage protection (that is, the output capacitance C in protective current output precision 106OUTWill not be because LED be from electric current output precision 106
Two output ends it is separated when electric current output precision 106 two output ends between output voltage VOUTIt is equal to or more than
Its rated voltage and be damaged).But, in the system shown in figure 1, controller assemblies 104 can not direct measurement it is defeated to electric current
The output voltage V gone out between two output ends of component 106OUT, thus can not exactly control electric current output precision 106 two
Output voltage during individual output end open circuit.
In order to solve one or more problems present in the system shown in Fig. 1, it is proposed that retouched in detail below with reference to Fig. 2-4
The system for being used to provide output current to one or more light emitting diodes according to embodiments of the present invention stated.
Fig. 2 is the system for being used to provide output current to one or more light emitting diodes according to embodiments of the present invention
Circuit diagram.As shown in Fig. 2 including AC rectification for the system 200 that output current is provided to one or more light emitting diodes
Component 202, electric resistance partial pressure component 204, switch control assembly 206 and electric current output precision 208.AC rectification component 202 is wrapped
Include first, second, third and the 4th rectifier stack terminal 202-1,202-2,202-3,202-4.Electric resistance partial pressure component 204
Including first, second and the 3rd partial pressure pack terminals 204-1,204-2,204-3.Switch control assembly 206 include first,
Second, third, the 4th and the 5th control assembly terminal VIN, GATE, CS, GND, VDD.Electric current output precision 208 includes the
First, second, third, the 4th and the 5th output precision terminal 208-1,208-2,208-3,208-4,208-5.
As shown in Fig. 2 first and second rectifier stack terminal 202-1,202-2 of AC rectification component 202 respectively with friendship
Flow power supply two ends connection, third and fourth rectifier stack terminal 202-3,202-4 respectively with electric resistance partial pressure component 204 first
With second partial pressure pack terminals 204-1,204-2 connections.3rd partial pressure pack terminals 204-3 of electric resistance partial pressure component 204 is with opening
Close the first control assembly terminal VIN connections of control assembly 206.Switch the second control assembly terminal GATE of control assembly 206
It is connected with the second output precision terminal 208-2 of electric current output precision 208, the 3rd control assembly terminal CS and electric current output precision
208 the 3rd output precision terminal 208-3 connections, the 4th control assembly terminal GND ground connection, the 5th control assembly terminal VDD warps
It is connected by resistor R3 and is grounded via capacitor C1 with the first partial pressure pack terminals 204-1 of electric resistance partial pressure component 204.Electricity
Flow the first output precision terminal 208-1 of output precision 208 and the first partial pressure pack terminals 204-1 of electric resistance partial pressure component 204
Connection, the 4th output precision terminal 208-4 ground connection.Output capacitance C in electric current output precision 208OUTWith one or more LED
It is connected in parallel between the first output precision terminal 208-1 of electric current output precision 208 and the 5th output precision terminal 208-5
(the first output precision terminal 208-1 and the 5th output precision terminal 208-5 are two output ends of electric current output precision 208).
In the system shown in Fig. 2, AC rectification component 202 receives AC-input voltage VAC, and by AC-input voltage
VACRectification is DC voltage VBULK, to provide electric current to one or more LED.Electric resistance partial pressure component 204 by resistor R1 and
R2 is to DC voltage VBULKPartial pressure is carried out, to be generated into the voltage signal V of switch control assembly 206VIN.By electric resistance partial pressure group
Part 204 is to DC voltage VBULKCarry out the voltage signal V that partial pressure is obtainedVINVia the 3rd partial pressure component of electric resistance partial pressure component 204
Terminal 204-3 and the first control assembly terminal VIN of switch control assembly 206 enter voltage control component 206.Voltage control group
Part 206 switchs MOSFET output control signals by system power of the GATE terminals into electric current output precision 208, to control to be
System power switch MOSFET conducting and cut-off.When system power switch MOSFET conductings, flow through in electric current output precision 208
Inductor L1 electric current sensed by the sense resistor RS in electric current output precision 208 so that current sensing signal
Control assembly 206 is switched on and off to receive by the 3rd control assembly terminal CS.As response, control assembly 206 is switched by electric current
Sensing signal generates control signal as one in multiple basis signals, with control system power switch MOSFET conducting
With cut-off.When system power switch MOSFET cut-offs, inductor L1, diode D1 in electric current output precision 208 and
It is connected between one or more LED between two output ends of electric current output precision 208 and forms current loop.
Specifically, as shown in Fig. 2 system power switch MOSFET grid is used as the second defeated of electric current output precision 208
Go out pack terminals 208-2；System power switch MOSFET drain electrode and diode D1 the first diode terminal and inductor L1
The first inductor terminals connection；Diode D1 the second diode terminal as electric current output precision 208 the first output group
Part terminal 208-1；The colelctor electrode that system power switchs MOSFET is used as the 3rd output precision terminal of electric current output precision 208
208-3, and be grounded via sense resistor RS；Inductor L1 the second inductor terminals are used as electric current output precision 208
5th output precision terminal 208-5；One or more LED and output capacitance COUTIt is connected in the of electric current output precision 208 in parallel
Between one output precision terminal 208-1 and the 5th output precision terminal 208-5.
As shown in Fig. 2 switch control assembly 206 includes overvoltage protective module, pulse width modulation (PWM) signal generation mould
Block, grid electrode drive module, demagnetization detection module, current sensing module and reference signal generation module.Wherein, overvoltage protection
Module is based on the voltage signal V from electric resistance partial pressure component 204VIN, come self-demagnetization detection module demagnetization signal, from PWM letter
The modulated signal of number generation module and the reference signal generation overvoltage protection signal for carrying out self-generated reference signal generation module, demagnetization
Detection module is moved back based on the curtage signal generation related to the demagnetization situation of the inductor L1 in electric current output precision 208
Magnetic signal, current sensing module is based on the current sensing signal obtained by the sense resistor RS in electric current output precision 208
Generation sensing current related signals, pwm signal generation module is based on overvoltage protection signal, demagnetization signal and sensing electric current phase
OFF signal generates modulated signal, and grid electrode drive module is based on modulated signal generation drive signal and is used to driving current output precision
System power in 208 switchs MOSFET conducting and cut-off.
Specifically, in the present embodiment, the general principle of pwm signal generation module generation modulated signal is as follows：When one
Or multiple LED are connected between two output ends of electric current output precision 106 and during normal work, pwm signal generation module
Based on demagnetization signal and sensing current related signals generation modulated signal, to the system work(in control electric current output precision 208
Rate switchs MOSFET cut-off and conducting, so as to adjust the electric current for flowing through one or more LED (for example, when demagnetization signal is indicated
At the end of demagnetization, modulated signal is changed into high level by pwm signal generation module from low level；When sensing current related signals are indicated
When sensing electric current reaches setting value, modulated signal is changed into low level by pwm signal generation module from high level；Demagnetization signal and sense
Survey current related signals alternately control pwm signal generation module generation modulated signal)；When LED is from the two of electric current output precision 106
Individual output end it is separated when or during LED failure, the overvoltage that pwm signal generation module is generated based on overvoltage protective module
Protection signal generates modulated signal, and cut-off shape is in the system power switch MOSFET in control electric current output precision 208
State so that the output voltage V between two output ends of electric current output precision 208OUTIt is not above the specified of output capacitance Cout
Voltage (that is, protects output capacitance CoutIt is not damaged by).In the present embodiment, the modulated signal of pwm signal generation module generation is real
It is the control signal that MOSFET is switched for system power on border.
Fig. 3 is the working waveform figure in the circuit system shown in Fig. 2.In figure 3, PWM waveform is pwm signal generation module
Output waveform (that is, the waveform of modulated signal), GATE waveforms for grid electrode drive module output waveform (that is, drive signal
Waveform), ILWaveform is the current waveform for flowing through inductor L1, and Demag waveforms (that is, move back for the output waveform of demagnetization detection module
The waveform of magnetic signal).TONSwitching the MOSFET duration in the conduction state for system power, (that is, system power is switched
MOSFET ON time), TOFFSwitching duration of the MOSFET in cut-off state for system power, (that is, system power is opened
Close MOSFET deadline), TDemagFor the inductor L1 demagnetization time, and TDemagLess than TOFF。
In the system shown in Fig. 2, when the second control assembly terminal GATE of switch control assembly 206 output voltage is
During high level (that is, the GATE waveforms in Fig. 3 are logically high), the system power switch MOSFET in electric current output precision 208 is led
It is logical, flow through the inductor L1 in electric current output precision 208 electric current linear rise (flow through inductor L1 current value can according to etc.
Formula (1) show that wherein t is the time that electric current flows through inductor L1).In electric current output precision 208, inductor L1 electricity is flowed through
Stream switchs MOSFET flows through sense resistor RS to ground by system power, and the magnitude of voltage produced on sense resistor RS is (i.e.,
The magnitude of voltage V sensed at the 3rd control assembly terminal CS of switch control assembly 206CS) can be drawn according to equation (2).When
VCSReach that setting value or t reach setting value TONWhen, switch the second control assembly terminal GATE of control assembly 206 output electricity
Buckling is the system power switch in low level (that is, the GATE waveforms in Fig. 3 are changed into logic low), electric current output precision 208
MOSFET ends.Now, the inductor L1 in electric current output precision 208 is moved back by diode D1 and one or more LED
Magnetic, by TDemagTime retreats magnetic knot beam, flows through inductor L1 electric current vanishing.Switching control assembly 206 can be by inspection
The electric current of inductor L1 in flow measurement overcurrent output precision 208 determines inductor L1 demagnetization starting point and end point, from
And obtain demagnetization time Tdemag(demagnetization time, wherein I can be drawn according to equation (3)PKIt is the electric current I for flowing through inductor L1L's
Maximum, VOUT_PKBe electric current output precision 208 two output ends between output voltage VOUTMaximum).Further, since
Circuit system shown in Fig. 2 is substantially the improvement to BUCK circuits, so between two output ends of electric current output precision 208
Output voltage VOUTWith the DC voltage V exported by AC rectification component 202BULKBetween relation such as equation (4) shown in.
Equation (1)
Equation (2)
Equation (3)
Equation (4)
That is, based on the DC voltage V exported by AC rectification component 202BULK, system power switch MOSFET
ON time TONAnd inductor L1 demagnetization time TDemag, it is possible to use equation (4) calculates output voltage VOUT。
Fig. 4 is the circuit diagram of overvoltage protection (OVP) module in the circuit system shown in Fig. 2.As shown in figure 4, overvoltage is protected
Protecting module includes the first trsanscondutance amplifier GM1, the second trsanscondutance amplifier GM2, switch K1, reset cell, capacitor C and ratio
Compared with device COMP1.Wherein, the first trsanscondutance amplifier GM1 be connected to switch control assembly 206 the first control assembly terminal VIN with
Between the first switch terminal for switching K1, the second trsanscondutance amplifier GM2 is connected to switch K1 second switch terminal and overvoltage is protected
Between the reference signal generation module for protecting module-external, reset cell is connected to switch K1 second switch terminal and overvoltage protection
Between the demagnetization detection module of module-external, capacitor C is connected between switch K1 second switch terminal and ground, comparator
COMP1 is connected between the pwm signal generation module outside switch K1 second switch terminal and overvoltage protective module.
As shown in figure 4, AC rectification component 202 is to AC-input voltage VACCarry out the DC voltage V that rectification is obtainedBULKQuilt
Resistor R1 and R2 partial pressure in electric resistance partial pressure component 204, so as to generate the first control assembly end of switch control assembly 206
Voltage signal at sub- VIN；PWM generation module export modulated signal (that is, the PWM waveform in Fig. 3) for high level (i.e.,
System power switch MOSFET conducting) when switch K1 conducting, switch control assembly 206 the first control assembly terminal VIN at
Voltage signal generates I_source electric currents by the first trsanscondutance amplifier GM1 and charged to capacitor C, is simultaneously from reference signal life
Into module reference signal Vth_ovp by the second trsanscondutance amplifier GM2 generate I_sink electric currents give capacitor C discharge；If
I_source ＞ I_sink, then the voltage Vramp risings on capacitor C；The control signal exported in PWM generation module (that is, is schemed
PWM waveform in 3) for low level (that is, system power switch MOSFET cut-off and inductor L1 demagnetize) when switch K1 cut-off, this
When only come self-generated reference signal generation module reference signal Vth_ovp pass through the second trsanscondutance amplifier GM2 generate I_sink electricity
The voltage Vramp given on capacitor C electric discharges, capacitor C is flowed to decline.
Inductor L1 every time demagnetization terminate after, by comparator COMP1 compare Vramp voltages and Vth_ovp voltages come
Judge whether to need triggering overvoltage protection (OVP) (if for example, Vramp triggers OVP higher than Vth_ovp).Compare knot every time
Shu Hou, by reset cell by the voltage Vramp enforced resets on capacitor C to Vth_ovp.
Here, the voltage signal at the first control assembly terminal VIN of switch control assembly 206 can be according to equation (5)
Draw.
Equation (5)
Output voltage V between two output ends of electric current output precision 208OUTIn critical OVP voltages (VOUT_OVP)
When, the T in each cycle charged and discharged to inductor L1ONTo capacitor C charging voltage and in demagnetization in time
Discharge voltage in time to capacitor C is equal (such as shown in equation (6))：
Equation (6)
With reference to equation (4) to (6), it can be deduced that equation (7)：
Equation (7)
It was found from described above, by each cycle charged and discharged to inductor L1 inductor L1 demagnetize
At the end of compare Vramp and Vth_ovp, and when Vramp is higher than Vth_ovp triggering OVP (that is, closing switch is controlled immediately
Second control assembly terminal GATE of component 206 output), it is possible to achieve high-precision overvoltage protection.Here, critical OVP electricity
Press VOUT_OVPCan be the rated voltage of the output capacitance Cout in electric current output precision 206, can be according to critical OVP voltages
VOUT_OVPWith go out reference signal Vth_ovpPrecompute required R1 and R2 ratios.
As can be seen that including disclosed herein is such a output voltage control method：Using characterizing one or more LED
Whether in running order control signal generates voltage sense signal (that is, Vramp)；Voltage sense signal is referred to
Voltage (that is, the V that the voltage shown is indicated with reference signalth_ovp) be compared, and whether output voltage is judged according to comparative result
Higher than scheduled voltage；In the case where output voltage is higher than scheduled voltage, utilize control signal (that is, above-mentioned modulated signal)
Close system power switch (that is, above-mentioned MOSFET).
It will be understood by those skilled in the art that also exist can be used for realize the embodiment of the present invention more optional embodiments and
Improved procedure, and above-mentioned embodiment and example are only the explanations of one or more embodiments.Therefore, the scope of the present invention is only
Limited by appended claims.
Claims (7)
1. a kind of system for being used to provide output current to one or more light emitting diodes, including：
Control assembly is switched, is configured as being generated according to the information associated with sensing signal, demagnetization signal and reference signal
Control signal, and using the control signal come the cut-off and conducting of control system power switch, wherein
The system power switch is connected to the first diode terminal of diode and the first inductor terminals of inductor, institute
Stating diode also includes the second diode terminal, and the inductor also includes the second inductor terminals, and one or many
Individual light emitting diode and output capacitance are connected in parallel between second diode terminal and second inductor terminals,
The sensing signal is that the electric current for flowing through the system power switch by sensing is generated, and the demagnetization signal is to pass through
Sensing flows through the electric current generation of the inductor, and the reference signal is prearranged signals,
It is described switch control assembly include switch, the first trsanscondutance amplifier, the second trsanscondutance amplifier, comparator, capacitor and
Reset cell, wherein
The conducting of the switch is controlled with cut-off by the control signal,
First trsanscondutance amplifier utilizes the input for being externally entering the switch control assembly during the switch conduction
The electric current of signal generation first, to be charged to the capacitor,
Second trsanscondutance amplifier during the switch conduction and the demagnetization signal indicate the demagnetization period during,
The second electric current is generated using the reference signal, to discharge the capacitor,
The comparator compares current voltage and the ginseng on the capacitor at the end of the demagnetization signal indicates demagnetization
The voltage of signal designation is examined, and the control signal is generated according to comparative result,
The electricity that the reset cell is indicated in the current voltage that the comparator is completed on the capacitor with the reference signal
During the comparison of pressure, the voltage that the current voltage forced resetting on the capacitor is indicated to the reference signal.
2. system according to claim 1, it is characterised in that the switch control assembly is additionally configured to：
Modulated signal is generated according to the information associated with the sensing signal and the demagnetization signal, and described one
Individual or multiple light emitting diodes are connected between second diode terminal and second inductor terminals and in work
The modulated signal is controlled into the conducting and cut-off of the system power switch as the control signal during state, and
The control is generated according to the information associated with the demagnetization signal, the reference signal and the modulated signal
Signal, and one or more of light emitting diodes from second diode terminal and second inductor terminals it
Conducting and cut-off separated or that control the system power switch when breaking down according to the control signal.
3. system according to claim 1, it is characterised in that also include：
AC rectification component, is configured as carrying out rectification to the AC signal from AC power generating the letter of the voltage after rectification
Number；
Electric resistance partial pressure component, is configured as carrying out partial pressure to the voltage signal after the rectification being generated into the switch control
The input signal of component, wherein
The AC rectification component includes first, second, third and the 4th rectifier stack terminal, first and second rectification
Two ends of the pack terminals respectively with the AC power are connected, the third and fourth rectifier stack terminal respectively with the resistance
The first and second partial pressure pack terminals connection of partial pressure component, wherein the 4th rectifier stack terminal is also connected to ground,
The electric resistance partial pressure component also includes the 3rd partial pressure pack terminals, and the 3rd partial pressure pack terminals are controlled to the switch
Component provides the input signal.
4. system according to claim 1, it is characterised in that when the current voltage on the capacitor is higher than the reference
During the voltage of signal designation, the switch control assembly generation is to control the institute of the system power switch in cut-off state
State control signal.
5. system according to claim 4, it is characterised in that the voltage that the reference signal is indicated is not more than for described
The product of output capacitance voltage set in advance and the scale factor of the circuit structure depending on the system.
6. a kind of method for the output voltage for controlling the system for providing output current to one or more light emitting diodes, bag
Include：
Control signal generation output voltage detection using cut-off with the conducting of the system power switch controlled in the system is believed
Number；
The voltage that the voltage that the voltage sense signal is indicated is indicated with reference signal is compared, and according to comparing knot
Fruit judges whether the output voltage of the system is higher than scheduled voltage；
In the case where the output voltage of the system is higher than the scheduled voltage, the system is controlled using the control signal
Power switch of uniting is in cut-off state, wherein
The system power switch is connected to the first diode terminal of diode and the first inductor terminals of inductor, institute
Stating diode also includes the second diode terminal, and the inductor also includes the second inductor terminals, and one or many
Individual light emitting diode and output capacitance are connected in parallel between second diode terminal and second inductor terminals,
The control signal is generated according to the information associated with sensing signal, demagnetization signal and the reference signal,
The sensing signal is that the electric current for flowing through the system power switch by sensing is generated, and the demagnetization signal is by sensing
Flow through the electric current generation of the inductor.
7. method according to claim 6, it is characterised in that the voltage that the reference signal is indicated is not more than internal reference
The product of voltage and the scale factor of the circuit structure depending on the system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510705470.2A CN105357794B (en) | 2015-10-27 | 2015-10-27 | System for providing from output current to one or more light emitting diodes |
| TW105100307A TWI578847B (en) | 2015-10-27 | 2016-01-06 | A system for providing an output current to one or more light emitting diodes |
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| CN201510705470.2A CN105357794B (en) | 2015-10-27 | 2015-10-27 | System for providing from output current to one or more light emitting diodes |
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| CN105392231B (en) * | 2015-12-03 | 2017-10-31 | 昂宝电子（上海）有限公司 | System for providing from output current to one or more light emitting diodes |
| CN107529242B (en) * | 2016-06-22 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN107529241B (en) * | 2016-06-22 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| CN106686831B (en) * | 2017-02-24 | 2019-03-05 | 上海晶丰明源半导体股份有限公司 | Output open circuit protects circuit, controllable silicon light modulation LED drive system and method |
| CN110446293A (en) * | 2018-05-04 | 2019-11-12 | 台达电子工业股份有限公司 | Light-emitting component drive apparatus and its driving method |
| CN115190682B (en) * | 2022-09-07 | 2022-12-20 | 深圳利普芯微电子有限公司 | Overvoltage protection circuit and LED drive power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104541449A (en) * | 2011-11-17 | 2015-04-22 | 美国亚德诺半导体公司 | Low noise auto-zero circuits for amplifiers |
| CN104918392A (en) * | 2015-07-10 | 2015-09-16 | 昂宝电子（上海）有限公司 | System for providing output current for one or more than one light emitting diode |
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| DE102010041632A1 (en) * | 2010-09-29 | 2012-03-29 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement for operating at least two semiconductor light sources |
| CN105246194B (en) * | 2011-11-15 | 2018-07-03 | 昂宝电子（上海）有限公司 | For the LED illumination System and method of the current constant control in various operation modes |
| CN103024994B (en) * | 2012-11-12 | 2016-06-01 | 昂宝电子（上海）有限公司 | Use dimming control system and the method for TRIAC dimmer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104541449A (en) * | 2011-11-17 | 2015-04-22 | 美国亚德诺半导体公司 | Low noise auto-zero circuits for amplifiers |
| CN104918392A (en) * | 2015-07-10 | 2015-09-16 | 昂宝电子（上海）有限公司 | System for providing output current for one or more than one light emitting diode |
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| CN105357794A (en) | 2016-02-24 |
| TWI578847B (en) | 2017-04-11 |
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