CN105392231B - 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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- CN105392231B CN105392231B CN201510881084.9A CN201510881084A CN105392231B CN 105392231 B CN105392231 B CN 105392231B CN 201510881084 A CN201510881084 A CN 201510881084A CN 105392231 B CN105392231 B CN 105392231B
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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, sampled signal, and the associated information generation control signal of reference signal, and using control signal come the cut-off and conducting of control system power switch, wherein system power switch is connected to the first diode terminal of diode and the first inductor terminals of inductor, diode also includes the second diode terminal, inductor also includes the second inductor terminals, and one or more light emitting diodes and output capacitance are connected in parallel between the second diode terminal and the second inductor terminals, sensing signal is that the electric current for flowing through system power switch by sensing is generated, demagnetization signal is that the electric current for flowing through inductor by sensing is generated, sampled signal is generated by the voltage at the second diode terminal of sampling, 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
The invention provides it is a kind of it is novel be used for one or more light emitting diodes provide output current system, with
And the method for controlling the output voltage for the system to one or more light emitting diodes offer output current.
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 associated with sensing signal, demagnetization signal, sampled signal and reference signal
Control signal is generated, and using the control signal come the cut-off and conducting of control system power switch, wherein the system work(
Rate switch is connected to the first diode terminal of diode and the first inductor terminals of inductor, and the diode also includes
Second diode terminal, the inductor also include the second inductor terminals, and one or more of light emitting diodes with
Output capacitance is connected in parallel between second diode terminal and second inductor terminals, and the sensing signal is logical
Cross sensing and flow through the electric current generation that the system power is switched, the demagnetization signal is to flow through the inductor by sensing
Electric current generation, the sampled signal is generated by the voltage at second diode terminal of sampling, 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.Wherein,
The control signal is given birth to according to the information associated with sensing signal, demagnetization signal, sampled signal and the reference signal
Into, the sensing signal is that the electric current for flowing through the system power switch by sensing is generated, and the demagnetization signal is logical
Cross sensing and flow through what the electric current for switching the inductor being connected in series with the system power was generated, the sampled signal is by adopting
The voltage generation of the one or more of light emitting diode ends of sample, the reference signal is prearranged signals.
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 buck structural system for being traditionally used for providing output current to one or more light emitting diodes
The circuit diagram of (BUCK BOOST circuits)；
Fig. 2 a are the systems for being used to provide output current to one or more light emitting diodes according to embodiments of the present invention
Circuit diagram；
Fig. 2 b are the systems for being used to provide output current to one or more light emitting diodes according to embodiments of the present invention
Another circuit diagram；
Fig. 3 is the working waveform figure in the circuit system shown in Fig. 2 a and 2b；
Fig. 4 is the circuit diagram of overvoltage protection (OVP) module in the circuit system shown in Fig. 2 a and 2b.
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 buck structural system (BUCK BOOST circuits) of output current.
As shown in figure 1, being wrapped for the buck structural system 100 that output current is provided to one or more light emitting diodes
Include AC rectification component 102, controller assemblies 104 and electric current output precision 106.Specifically, when one or more LED connect
When being connected between two output ends of electric current output precision 106：AC rectification component 102 receives AC-input voltage VAC, and will
AC-input voltage VACIt is transformed to DC voltage VBULK, to provide electric current to one or more LED.Controller assemblies 104 pass through
System power of the GATE terminals into electric current output precision 106 switchs 1062 output control signals, with control system power switch
1062 conducting and cut-off, so as to adjust the electric current (or being output current) for flowing through one or more LED.When system power is opened
When closing 1062 and turning on, the electric current of inductor 1064 in electric current output precision 106 is flowed through by the sensing in electric current output precision 106
Resistor 1066 is sensed, so that current sensing signal is arrived by controller assemblies 104 by CS terminal receptions.It is used as sound
Should, controller assemblies 104 generate control signal according to current sensing signal, with the conducting of control system power switch 1062 with cutting
Only.When system power switch 1062 ends, inductor 1064, diode 1068, Yi Jilian in electric current output precision 106
It is connected between one or more LED between two output ends of electric current output precision 106 and forms 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 provide two outputs for electric current output precision 106 in the buck structural system shown in Fig. 1
Overvoltage protection (that is, the output capacitance C in protective current output precision 106 during the open circuit of endOUTIt will not be exported due to LED from electric current
Two output ends of component 106 it is separated when electric current output precision 106 two output ends between output voltage VOUTIt is equal to
Or be damaged more than its rated voltage).But, in the buck structural system shown in Fig. 1, the nothing of controller assemblies 104
Method direct measurement is to the output voltage V between two output ends of electric current output precision 106OUT, thus electricity can not be controlled exactly
Flow output voltage during two output ends open circuit of output precision 106.
In order to solve one or more problems present in the buck structural system shown in Fig. 1, it is proposed that below with reference to
Fig. 2 a-4 be described in detail it is according to embodiments of the present invention be used for be to what one or more light emitting diodes provided output current
System.
Fig. 2 a are the systems 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 Figure 2 a, include exchanging whole for providing the system 200 of output current to one or more light emitting diodes
Flow component 202, electric resistance partial pressure component 204, switch control assembly 206 and electric current output precision 208.AC rectification component 202
Including first, second, third and the 4th rectifier stack terminal 202-1,202-2,202-3,202-4.Electric resistance partial pressure component
204 include first, second and the 3rd partial pressure pack terminals 204-1,204-2,204-3.Switching control assembly 206 includes the
First, second, third, the 4th and the 5th control assembly terminal VIN, GATE, CS, GND, VDD.Electric current output precision 208 includes
First, second, third, fourth and the 5th output precision terminal 208-1,208-2,208-3,208-4,208-5.
As shown in Figure 2 a, 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 current output precision 208 first
Output precision terminal 208-1 and ground (GND) connection.First and second partial pressure pack terminals 204-1 of electric resistance partial pressure component 204,
204-2 (is used to obtain sampled voltage V with the 5th output precision terminal 208-5 of electric current output precision 208 respectivelySENSE) and GND
Connection.3rd partial pressure pack terminals 204-3 of electric resistance partial pressure component 204 and the first control assembly end of switch control assembly 206
Sub- VIN connections.Switch the second control assembly terminal GATE of control assembly 206 and the second output group of electric current output precision 208
Part terminal 208-2 connections, the 3rd control assembly terminal CS and electric current output precision 208 the 3rd output precision terminal 208-3 connects
Connect, the 4th control assembly terminal GND ground connection, the 5th control assembly terminal VDD is via resistor R3 and electric current output precision 208
5th output precision terminal 208-5 connections and via capacitor C1 ground connection (the 5th control assembly terminal VDD be used for control to switch
Component 206 processed is powered).The 4th output precision terminal 208-4 ground connection of electric current output precision 208.In electric current output precision 208
Output capacitance COUTWith one or more LED be connected in parallel electric current output precision 208 the first output precision terminal 208-1 and
(the first output precision terminal 208-1 and the 5th output precision terminal 208-5 are electric currents between 5th output precision terminal 208-5
Two output ends of output precision 208).
In the system shown in Fig. 2 a, 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 sampled voltage VSENSEPartial 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 sampled voltage VSENSECarry 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 Figure 2 a, 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；Inductor L1 the second inductor terminals as electric current output precision 208 the first output group
Part terminal 208-1；Diode D1 the second diode terminal as electric current output precision 208 the 5th output precision terminal 208-
5；System power switchs MOSFET colelctor electrode as the 3rd output precision terminal 208-3 of electric current output precision 208, and passes through
It is grounded by sense resistor RS；One or more LED and output capacitance COUTIt is connected in the first of electric current output precision 208 in parallel
Between output precision terminal 208-1 and the 5th output precision terminal 208-5.
As shown in Figure 2 a, switch control assembly 206 includes overvoltage protective module, pulse width modulation (PWM) signal generation
Module, grid electrode drive module, demagnetization detection module, current sensing module and reference signal generation module.Wherein, overvoltage is protected
Module is protected based on the voltage signal V from electric resistance partial pressure component 204VIN, carry out the demagnetization signal of self-demagnetization detection module, from PWM
The modulated signal of signal generation module and the reference signal generation overvoltage protection signal for carrying out self-generated reference signal generation module, are moved back
Magnetic testi module is based on the curtage signal generation related to the demagnetization situation of the inductor L1 in electric current output precision 208
Demagnetization signal, current sensing module is believed based on the current sense obtained by the sense resistor RS in electric current output precision 208
Number generation sensing current related signals, pwm signal generation module be based on overvoltage protection signal, demagnetization signal and sensing electric current
Coherent 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 208 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 208
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 Cout to be not damaged by).In the present embodiment, the modulated signal of pwm signal generation module generation
Actually it is used for the control signal that system power switchs MOSFET, switch control assembly 206 can be PWM chip.
Fig. 2 b are the systems for being used to provide output current to one or more light emitting diodes according to embodiments of the present invention
Another circuit diagram.Fig. 2 b and Fig. 2 a's differs only in, and the 5th control assembly terminal of switch control assembly 206 is not VDD
Pin but HV pins, and be directly connected with the 5th output precision terminal 208-5 of electric current output precision 208.
Fig. 3 is the working waveform figure in the circuit system shown in Fig. 2 a and 2b.In figure 3, PWM waveform is given birth to for pwm signal
Into the output waveform (that is, the waveform of modulated signal) of module, GATE waveforms (that is, drive for the output waveform of grid electrode drive module
The waveform of signal), ILWaveform is the current waveform for flowing through inductor L1, and Demag waveforms are the output waveform of demagnetization detection module
(that is, the waveform of demagnetization signal).TONMOSFET duration (that is, system powers in the conduction state are switched for system power
Switch MOSFET ON time), TOFFDuration (that is, the system work(that MOSFET is in cut-off state is switched for system power
Rate switchs MOSFET deadline), TDemagFor the inductor L1 demagnetization time, and TDemagLess than TOFF。
In the system shown in Fig. 2 a and 2b, when the second control assembly terminal GATE of switch control assembly 206 output
When voltage is high level (that is, the GATE waveforms in Fig. 3 are logically high), the system power switch in electric current output precision 208
MOSFET is turned on, and the electric current linear rise for flowing through the inductor L1 in electric current output precision 208 (flows through inductor L1 current value
It can be drawn according to equation (1), wherein t is the time that electric current flows through inductor L1).In electric current output precision 208, inductance is flowed through
Device L1 electric current switchs MOSFET flows through sense resistor RS to ground by system power, the electricity produced on sense resistor RS
Pressure value (that is, the magnitude of voltage V sensed at the 3rd control assembly terminal CS of switch control assembly 206CS) can be according to equation (2)
Draw.Work as VCSReach that setting value or t reach setting value TONWhen, switch the second control assembly terminal GATE's of control assembly 206
Output voltage is changed into the system power in low level (that is, the GATE waveforms in Fig. 3 are changed into logic low), electric current output precision 208
Switch MOSFET cut-offs.Now, the inductor L1 in electric current output precision 208 is entered by diode D1 and one or more LED
Row demagnetization, by TDemagTime retreats magnetic knot beam, flows through inductor L1 electric current vanishing.Switch control assembly 206 can lead to
The inductor L1 crossed in detection stream overcurrent output precision 208 electric current determines the inductor L1 demagnetization starting point with terminating
Point, so as to obtain demagnetization time Tdemag(demagnetization time, wherein I can be drawn according to equation (3)PKIt is the electricity for flowing through inductor L1
Flow ILMaximum, VOUT_PKBe electric current output precision 208 two output ends between output voltage VOUTMaximum).Separately
Outside, due to being the improvement to lifting laminated structure (BUCK BOOST) circuit in the system nature shown in Fig. 2, so electric current output group
Output voltage V between two output ends of part 208OUTWith the DC voltage V exported by AC rectification component 202BULKBetween
Shown in relation such as equation (4).
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 a and 2b.As shown in figure 4, mistake
Press protection module include the first trsanscondutance amplifier GM1, the second trsanscondutance amplifier GM2, switch K1, reset cell, capacitor C and
Comparator COMP1.Wherein, the first trsanscondutance amplifier GM1 is connected to the first control assembly terminal VIN of switch control assembly 206
Between first switch terminal with switching K1, the second trsanscondutance amplifier GM2 is connected to switch K1 second switch terminal and overvoltage
Between reference signal generation module outside protection module, reset cell is connected to switch K1 second switch terminal and overvoltage is protected
Between the demagnetization detection module for protecting 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 obtainedBULKWith
Output voltage VOUTSeries voltage (that is, the sampled voltage at the 5th output precision terminal 208-5 of electric current output precision 208)
VSENSEBy resistor R1 and the R2 partial pressure in electric resistance partial pressure component 204, so as to generate the first control of switch control assembly 206
Voltage signal at pack terminals VIN；The modulated signal (that is, the PWM waveform in Fig. 3) exported in PWM generation module is high electricity
Switch K1 conductings when flat (that is, system power switch MOSFET conductings), switch the first control assembly terminal of control assembly 206
Voltage signal at VIN generates I_source electric currents by the first trsanscondutance amplifier GM1 and charged to capacitor C, is simultaneously from ginseng
The reference signal Vth_ovp for examining signal generation module is put by the second trsanscondutance amplifier GM2 generation I_sink electric currents to capacitor C
Electricity；If the voltage Vramp on I_source ＞ I_sink, capacitor C rises；The control letter exported in PWM generation module
Number (that is, the PWM waveform in Fig. 3) is switched when being low level (that is, system power switch MOSFET cut-offs and inductor L1 demagnetizes)
K1 ends, and the reference signal Vth_ovp for now only carrying out self-generated reference signal generation module is generated by the second trsanscondutance amplifier GM2
I_sink electric currents discharge to capacitor C, and the voltage Vramp on capacitor C declines.
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 output capacitance C in electric current output precision 206OUTRated voltage, can be according to critical OVP voltages
VOUT_OVPWith 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：
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 that sampled signal is carried out partial pressure to be generated into the voltage signal of switch control assembly；
The switch control assembly, is configured as believing according to sensing signal, demagnetization signal, the sampled signal and reference
Number associated information generation 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 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 3rd rectifier stack terminal and second inductor terminals
Connection, and the 4th rectifier stack terminal is connected to ground,
The electric resistance partial pressure component includes first, second and the 3rd partial pressure pack terminals, the first partial pressure pack terminals and institute
The connection of the second diode terminal is stated, the second partial pressure pack terminals are connected to ground, and the 3rd partial pressure pack terminals are carried
Voltage signal for entering the switch control assembly,
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 sampled signal is by the electricity at second diode terminal of sampling
Pressure generation, and the reference signal is prearranged signals.
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
According to the information associated with the demagnetization signal, the sampled signal, the reference signal and the modulated signal
Generate the control signal, and in one or more of light emitting diodes from second diode terminal and described second
Inductor terminals separated or controlled according to the control signal when breaking down the conducting of the system power switch with
Cut-off.
3. system according to claim 2, it is characterised in that the switch control assembly includes switch, the first mutual conductance and put
Big device, the second trsanscondutance amplifier, comparator, the first capacitor and reset cell, wherein
The conducting of the switch is controlled with cut-off by the control signal,
First trsanscondutance amplifier utilizes the voltage for being externally entering the switch control assembly during the switch conduction
The electric current of signal generation first, to be charged to first 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 first capacitor,
The comparator compares current voltage and institute on first capacitor at the end of the demagnetization signal indicates demagnetization
The voltage of reference signal instruction is stated, and the control signal is generated according to comparative result,
The reset cell is indicated in the current voltage that the comparator is completed on first capacitor with the reference signal
Voltage comparison when, the voltage that the current voltage forced resetting on first capacitor is indicated to the reference signal.
4. system according to claim 3, it is characterised in that when the current voltage on first capacitor is higher than described
During the voltage that reference signal is indicated, control letter of the switch control assembly generation to end the system power switch
Number.
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. system according to claim 1, it is characterised in that the switch control assembly is used for from external reception electric energy
Terminal be connected via resistance with second diode terminal, and be connected to ground via the second capacitor.
7. system according to claim 1, it is characterised in that the switch control assembly is used for from external reception electric energy
Terminal be directly connected with second diode terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510881084.9A CN105392231B (en) | 2015-12-03 | 2015-12-03 | System for providing from output current to one or more light emitting diodes |
| TW105108887A TWI583120B (en) | 2015-12-03 | 2016-03-22 | A system and method for providing an output current to one or more light emitting diodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510881084.9A CN105392231B (en) | 2015-12-03 | 2015-12-03 | System for providing from output current to one or more light emitting diodes |
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| Publication Number | Publication Date |
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| CN105392231A CN105392231A (en) | 2016-03-09 |
| CN105392231B true CN105392231B (en) | 2017-10-31 |
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| CN108923390B (en) | 2016-03-29 | 2020-01-07 | 昂宝电子（上海）有限公司 | System and method for overvoltage protection of LED lighting |
| CN106413173B (en) * | 2016-06-22 | 2018-06-29 | 上海晶丰明源半导体股份有限公司 | A kind of pulse width modulation control signal adjusting control circuit, control method and LED drive system |
| 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 |
| TWI657715B (en) * | 2018-05-01 | 2019-04-21 | 葳天科技股份有限公司 | Low flicker ac led driving circuit and driving method thereof |
| TWI674816B (en) * | 2018-10-11 | 2019-10-11 | 茂達電子股份有限公司 | Driving circuit and method of using low inrush current |
| US11581795B2 (en) * | 2020-07-22 | 2023-02-14 | Mediatek Inc. | Current sensing circuit for generating sensed current signal with average value being constant under different input voltages of direct current to direct current converter and associated current-mode control circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090058323A1 (en) * | 2007-08-30 | 2009-03-05 | Ta-Yung Yang | Flyback LED drive circuit with constant current regulation |
| TWI436690B (en) * | 2010-12-03 | 2014-05-01 | Novatek Microelectronics Corp | Light emitting diode drving apparatus and method for holding driving volatge therefor |
| CN202005042U (en) * | 2011-04-07 | 2011-10-05 | 昂宝电子（上海）有限公司 | Novel light-emitting diode (LED) drive circuit with high power factor |
| 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 |
| CN103401424B (en) * | 2013-07-19 | 2014-12-17 | 昂宝电子（上海）有限公司 | System and method for regulating output current of power supply transformation system |
| TW201530999A (en) * | 2014-01-17 | 2015-08-01 | Beyond Innovation Tech Co Ltd | Boost apparatus with over-current and over-voltage protection function |
| CN104918392B (en) * | 2015-07-10 | 2018-03-16 | 昂宝电子（上海）有限公司 | System for providing from output current to one or more light emitting diodes |
| CN105357794B (en) * | 2015-10-27 | 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 |
-
2015
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| TWI583120B (en) | 2017-05-11 |
| CN105392231A (en) | 2016-03-09 |
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