CN105392231A - System for providing output current for one or multiple LED - Google Patents
System for providing output current for one or multiple LED Download PDFInfo
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- CN105392231A CN105392231A CN201510881084.9A CN201510881084A CN105392231A CN 105392231 A CN105392231 A CN 105392231A CN 201510881084 A CN201510881084 A CN 201510881084A CN 105392231 A CN105392231 A CN 105392231A
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Abstract
The invention provides a system for providing output current for one or multiple LED. The system comprises a switch control assembly, and the switch control assembly is configured to generate control signals according to information related to sensing, demagnetizing, sampling and reference signals and controls ON/OFF of a system power switch by utilizing the control signals. The system power switch is connected to a first diode terminal of a diode and a first inductor terminal of an inductor, the diode comprises a second diode terminal, the inductor further comprises a second inductor terminal, the one or multiple LED and an output capacitor are connected in parallel between a second diode terminal and the second inductor terminal, the sensing signals are generated by sensing current through the system power switch, the demagnetizing signals are generated by sensing the current through the inductor, the sampling signals are generated by sampling the voltage of the second diode terminal, and the reference signals are preset.
Description
Technical field
The present invention relates to circuit field, relate more specifically to a kind of for providing the system of output current to one or more light-emitting diode.
Background technology
At present, light-emitting diode (LED) lighting technology reaches its maturity.LED is the feature such as luminous efficiency is high, long service life owing to having, at lighting field by extensive in order to replace traditional incandescent lamp.But, when using LED to replace incandescent lamp, generally not there is over-voltage protecting function due to LED drive circuit or overvoltage protection precision is not high, causing LED drive circuit easily damaged or cannot be efficiently utilized.In order to realize high accuracy overvoltage protection, need in LED drive circuit, increase complicated periphery circuit, high its printed circuit size that can cause on the other hand of cost is large on the one hand for this, directly cannot put into lamp holder joints.
Summary of the invention
The invention provides a kind of novelty for providing the system of output current to one or more light-emitting diode and controlling the method for output voltage of the system for providing output current to one or more light-emitting diode.
According to the embodiment of the present invention for providing the system of output current to comprise to one or more light-emitting diode: switch control rule assembly, be configured to basis and sensing signal, demagnetization signal, sampled signal, and the information that reference signal is associated generates control signal, and utilize described control signal to come cut-off and the conducting of control system power switch, wherein said system power switch is connected to the first diode terminal of diode and the first inductor terminals of inductor, described diode also comprises the second diode terminal, described inductor also comprises the second inductor terminals, and described one or more light-emitting diode and output capacitance are connected in parallel between described second diode terminal and described second inductor terminals, described sensing signal flows through the electric current generation of described system power switch by sensing, described demagnetization signal flows through the electric current generation of described inductor by sensing, described sampled signal is generated by the voltage at the described second diode terminal place that samples, and described reference signal is prearranged signals.
Be used for providing the method for the output voltage of the system of output current to comprise to one or more light-emitting diode according to the control of the embodiment of the present invention: utilize and characterize the whether in running order control signal generation voltage sense signal of described one or more light-emitting diode; The voltage that the voltage indicate described voltage sense signal and reference signal indicate compares, and judges that whether the output voltage of described system is higher than scheduled voltage according to comparative result; When the output voltage of described system is higher than scheduled voltage, described control signal is utilized to close system power switch in described system.Wherein, described control signal generates according to the information be associated with sensing signal, demagnetization signal, sampled signal and described reference signal, described sensing signal flows through the electric current generation of described system power switch by sensing, described demagnetization signal generates by sensing the electric current flowing through the inductor be connected in series with described system power switch, described sampled signal is generated by the voltage at described one or more light-emitting diode one end place that samples, and described reference signal is prearranged signals.
According to the embodiment of the present invention for provide to one or more light-emitting diode the system of output current and control for providing the method for the output voltage of the system of output current can provide high-precision over-voltage protecting function to one or more light-emitting diode.
Accompanying drawing explanation
Below in conjunction with accompanying drawing in the description of the specific embodiment of the present invention, the present invention may be better understood, wherein:
Fig. 1 is the circuit diagram of traditional buck structural system (BUCKBOOST circuit) for providing output current to one or more light-emitting diode;
Fig. 2 a is the circuit diagram of the system for providing output current to one or more light-emitting diode according to the embodiment of the present invention;
Fig. 2 b is another circuit diagram of the system for providing output current to one or more light-emitting diode according to the embodiment of the present invention;
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 characteristic sum exemplary embodiment of various aspects of the present invention will be described in detail below.In the following detailed description, propose many details, to provide complete understanding of the present invention.But, it will be apparent to those skilled in the art that the present invention can implement when not needing some details in these details.Below the description of embodiment is only used to by illustrating example of the present invention to provide to better understanding of the present invention.Any concrete configuration that the present invention proposes below being never limited to and algorithm, but cover any amendment of element, parts and algorithm, replacement and improvement under the premise of without departing from the spirit of the present invention.In the the accompanying drawings and the following description, known structure and technology are not shown, to avoid causing the present invention unnecessary fuzzy.
In order to make the brightness constancy of LED, usually provide substantially invariable electric current to LED.Fig. 1 is the circuit diagram of traditional buck structural system (BUCKBOOST circuit) for providing output current to one or more light-emitting diode.
As shown in Figure 1, for providing the buck structural system 100 of output current to comprise AC rectification assembly 102, controller assemblies 104 and electric current output precision 106 to one or more light-emitting diode.Particularly, between two outputs that one or more LED is connected to electric current output precision 106 time: AC rectification assembly 102 receives AC-input voltage V
aC, and by AC-input voltage V
aCbe transformed to direct voltage V
bULK, to provide electric current to one or more LED.Controller assemblies 104 exports control signal by GATE terminal to the system power switch 1062 in electric current output precision 106, with the conducting of control system power switch 1062 and cut-off, thus regulate the electric current (or being called output current) flowing through one or more LED.When 1062 conducting of system power switch, the electric current flowing through the inductor 1064 in electric current output precision 106 is sensed by the sense resistor 1066 in electric current output precision 106, thus current sensing signal is arrived by CS terminal reception by controller assemblies 104.Responsively, controller assemblies 104 generates control signal, with the conducting of control system power switch 1062 and cut-off according to current sensing signal.When system power switch 1062 ends, the inductor 1064 in electric current output precision 106, diode 1068 and be connected to electric current output precision 106 two outputs between one or more LED between define current circuit.
In the system shown in figure 1, when LED from two outputs of electric current output precision 106 separated time (, during two outputs open circuit) or LED break down when can not work, the output voltage V between two outputs of electric current output precision 106
oUTtoo highly (can such as, be equal to, or greater than the output capacitance C between two outputs being connected to electric current output precision 106
oUTrated voltage), thus cause the output capacitance C in electric current output precision 106
oUTeasily damaged.
So, need overvoltage protection (that is, the output capacitance C in protective current output precision 106 during two the output open circuits being provided for electric current output precision 106 in the buck structural system shown in Fig. 1
oUTcan not because LED be from the output voltage V between two outputs of electric current output precision 106 during two outputs of electric current output precision 106 separated
oUTbe equal to, or greater than its rated voltage and damaged).But in the buck structural system shown in Fig. 1, controller assemblies 104 directly cannot measure the output voltage V between two outputs of electric current output precision 106
oUT, thus cannot control output voltage during two output open circuits of electric current output precision 106 exactly.
In order to solve the one or more problems existed in the buck structural system shown in Fig. 1, propose the system for providing output current to one or more light-emitting diode according to the embodiment of the present invention described in detail below with reference to Fig. 2 a-4.
Fig. 2 a is the circuit diagram of the system for providing output current to one or more light-emitting diode according to the embodiment of the present invention.As shown in Figure 2 a, for providing the system 200 of output current to comprise AC rectification assembly 202, electric resistance partial pressure assembly 204, switch control rule assembly 206 and electric current output precision 208 to one or more light-emitting diode.AC rectification assembly 202 comprises first, second, third and the 4th rectifier stack terminal 202-1,202-2,202-3,202-4.Electric resistance partial pressure assembly 204 comprises first, second and the 3rd dividing potential drop pack terminals 204-1,204-2,204-3.Switch control rule assembly 206 comprises first, second, third, fourth and the 5th control assembly terminal VIN, GATE, CS, GND, VDD.Electric current output precision 208 comprises 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 assembly 202 are connected with the two ends of AC power respectively, and third and fourth rectifier stack terminal 202-3,202-4 is connected with the first output precision terminal 208-1 of electric current output precision 208 and ground (GND) respectively.First and second dividing potential drop pack terminals 204-1,204-2 of electric resistance partial pressure assembly 204 respectively with the 5th output precision terminal 208-5 of electric current output precision 208 (for obtaining sampled voltage V
sENSE) be connected with GND.3rd dividing potential drop pack terminals 204-3 of electric resistance partial pressure assembly 204 is connected with the first control assembly terminal VIN of switch control rule assembly 206.Second control assembly terminal GATE of switch control rule assembly 206 is connected with the second output precision terminal 208-2 of electric current output precision 208,3rd control assembly terminal CS is connected with the 3rd output precision terminal 208-3 of electric current output precision 208,4th control assembly terminal GND ground connection, the 5th control assembly terminal VDD to be connected with the 5th output precision terminal 208-5 of electric current output precision 208 via resistor R3 and via capacitor C1 ground connection (the 5th control assembly terminal VDD is used for powering to switch control rule assembly 206).4th output precision terminal 208-4 ground connection of electric current output precision 208.Output capacitance C in electric current output precision 208
oUTand one or more LED is connected in (the first output precision terminal 208-1 and the 5th output precision terminal 208-5 is two outputs of electric current output precision 208) between the first output precision terminal 208-1 of electric current output precision 208 and the 5th output precision terminal 208-5 in parallel.
In the system shown in Fig. 2 a, AC rectification assembly 202 receives AC-input voltage V
aC, and by AC-input voltage V
aCrectification is direct voltage V
bULK, to provide electric current to one or more LED.Electric resistance partial pressure assembly 204 passes through resistor R1 and R2 to sampled voltage V
sENSEcarry out dividing potential drop, to generate the voltage signal V entering switch control rule assembly 206
vIN.By electric resistance partial pressure assembly 204 couples of sampled voltage V
sENSEcarry out the voltage signal V that dividing potential drop obtains
vINvoltage control component 206 is entered via the 3rd dividing potential drop pack terminals 204-3 of electric resistance partial pressure assembly 204 and the first control assembly terminal VIN of switch control rule assembly 206.Voltage control component 206 exports control signal, with the conducting of control system power switch MOSFET and cut-off by GATE terminal to the system power switch MOS FET in electric current output precision 208.When system power switch MOS FET conducting, the electric current flowing through the inductor L1 in electric current output precision 208 is sensed by the sense resistor RS in electric current output precision 208, thus current sensing signal is received by the 3rd control assembly terminal CS by switch control rule assembly 206.Responsively, current sensing signal is generated control signal as in multiple basis signal by switch control rule assembly 206, with the conducting of control system power switch MOSFET and cut-off.When system power switch MOS FET ends, the inductor L1 in electric current output precision 208, diode D1 and be connected to electric current output precision 208 two outputs between one or more LED between define current circuit.
Particularly, as shown in Figure 2 a, the grid of system power switch MOS FET is as the second output precision terminal 208-2 of electric current output precision 208; The first inductor ends sub-connection of the drain electrode of system power switch MOS FET and first diode terminal of diode D1 and inductor L1; Second inductor terminals of inductor L1 is as the first output precision terminal 208-1 of electric current output precision 208; Second diode terminal of diode D1 is as the 5th output precision terminal 208-5 of electric current output precision 208; The collector electrode of system power switch MOS FET as the 3rd output precision terminal 208-3 of electric current output precision 208, and via sense resistor RS ground connection; One or more LED and output capacitance C
oUTbe 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.
As shown in Figure 2 a, switch control rule assembly 206 comprises 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 protective module is based on the voltage signal V from electric resistance partial pressure assembly 204
vIN, carry out the demagnetization signal of self-demagnetization detection module, from the modulation signal of pwm signal generation module, and the reference signal carrying out self-generated reference signal generation module generates overvoltage protection signal, demagnetization detection module generates demagnetization signal based on the curtage signal relevant to the demagnetization situation of the inductor L1 in electric current output precision 208, current sensing module generates current sensor coherent signal based on the current sensing signal obtained by the sense resistor RS in electric current output precision 208, pwm signal generation module is based on overvoltage protection signal, demagnetization signal, and current sensor coherent signal generates modulation signal, grid electrode drive module generates drive singal in order to the conducting of the system power switch MOS FET in drive current output precision 208 and cut-off based on modulation signal.
Particularly, in the present embodiment, the general principle that pwm signal generation module generates modulation signal is as follows: between two outputs that one or more LED is connected to electric current output precision 208 and when normally working, pwm signal generation module is based on demagnetization signal, modulation signal is generated with current sensor coherent signal, in order to control cut-off and the conducting of the system power switch MOS FET in electric current output precision 208, thus adjustment flows through the electric current of one or more LED (such as, at the end of demagnetization signal instruction demagnetization, modulation signal is become high level from low level by pwm signal generation module, when current sensor coherent signal instruction current sensor reaches set point, modulation signal is become low level from high level by pwm signal generation module, demagnetization signal and current sensor coherent signal alternately control pwm signal generation module and generate modulation signal), when LED is from during two outputs of electric current output precision 208 separated or when LED breaks down, the overvoltage protection signal that pwm signal generation module generates based on overvoltage protective module generates modulation signal, cut-off state is in, the output voltage V between two outputs making electric current output precision 208 in order to the system power switch MOS FET controlled in electric current output precision 208
oUTcan not higher than the rated voltage of output capacitance Cout (that is, protection output capacitance Cout be not damaged).In the present embodiment, the modulation signal that pwm signal generation module generates is actually the control signal for system power switch MOS FET, and switch control rule assembly 206 can be PWM chip.
Fig. 2 b is another circuit diagram of the system for providing output current to one or more light-emitting diode according to the embodiment of the present invention.The difference of Fig. 2 b and Fig. 2 a is only, the 5th control assembly terminal of switch control rule assembly 206 is not VDD pin but HV pin, and is 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 the output waveform (that is, the waveform of modulation signal) of pwm signal generation module, and GATE waveform is the output waveform (that is, the waveform of drive singal) of grid electrode drive module, I
lwaveform is the current waveform flowing through inductor L1, and Demag waveform is the output waveform (that is, the waveform of demagnetization signal) of demagnetization detection module.T
oNfor system power switch MOS FET is in the duration (that is, the ON time of system power switch MOS FET) of conducting state, T
oFFfor system power switch MOS FET is in the duration (that is, the deadline of system power switch MOS FET) of cut-off state, T
demagfor the demagnetization time of inductor L1, and T
demagbe less than T
oFF.
In the system shown in Fig. 2 a and 2b, when the output voltage of the second control assembly terminal GATE of switch control rule assembly 206 be high level (namely, GATE waveform in Fig. 3 is that logic is high) time, system power switch MOS FET conducting in electric current output precision 208, the electric current flowing through the inductor L1 in electric current output precision 208 linearly rises (current value flowing through inductor L1 can draw according to equation (1), and wherein t is the time that electric current flows through inductor L1).In electric current output precision 208, the electric current flowing through inductor L1 by system power switch MOS FET flows through sense resistor RS to ground, the magnitude of voltage that sense resistor RS produces is (that is, at the magnitude of voltage V that the 3rd control assembly terminal CS place of switch control rule assembly 206 senses
cS) can draw according to equation (2).Work as V
cSreach set point or t reaches set point T
oNtime, the output voltage of the second control assembly terminal GATE of switch control rule assembly 206 becomes low level (that is, the GATE waveform in Fig. 3 becomes logic low), and the system power switch MOS FET in electric current output precision 208 ends.Now, the inductor L1 in electric current output precision 208 is demagnetized, through T by diode D1 and one or more LED
demagtime retreats magnetic knot bundle, flows through the electric current vanishing of inductor L1.Switch control rule assembly 206 can determine demagnetization starting point and the end point of inductor L1 by the electric current detecting the inductor L1 flow through in electric current output precision 208, thus obtains demagnetization time T
demag(the demagnetization time can be drawn according to equation (3), wherein I
pKit is the electric current I flowing through inductor L1
lmaximum, V
oUT_PKbe electric current output precision 208 two outputs between output voltage V
oUTmaximum).In addition, owing to the system nature shown in Fig. 2 being the improvement to buck structure (BUCKBOOST) circuit, so the output voltage V between two of electric current output precision 208 outputs
oUTwith the direct voltage V exported by AC rectification assembly 202
bULKbetween relation as shown in equation (4).
That is, based on the direct voltage V exported by AC rectification assembly 202
bULK, system power switch MOS FET ON time T
oN, and the demagnetization time T of inductor L1
demag, equation (4) can be utilized to calculate output voltage V
oUT.
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, overvoltage protective module comprises the first trsanscondutance amplifier GM1, the second trsanscondutance amplifier GM2, K switch 1, reset cell, capacitor C and comparator COMP1.Wherein, first trsanscondutance amplifier GM1 is connected between the first control assembly terminal VIN of switch control rule assembly 206 and the first switch terminal of K switch 1, second trsanscondutance amplifier GM2 is connected between the second switch terminal of K switch 1 and the reference signal generation module of overvoltage protective module outside, reset cell is connected between the second switch terminal of K switch 1 and the demagnetization detection module of overvoltage protective module outside, capacitor C is connected between the second switch terminal of K switch 1 and ground, comparator COMP1 is connected between the second switch terminal of K switch 1 and the pwm signal generation module of overvoltage protective module outside.
As shown in Figure 4, AC rectification assembly 202 couples of AC-input voltage V
aCcarry out the direct voltage V that rectification obtains
bULKwith output voltage V
oUTseries voltage (that is, the sampled voltage at the 5th output precision terminal 208-5 place of electric current output precision 208) V
sENSEby the resistor R1 in electric resistance partial pressure assembly 204 and R2 dividing potential drop, thus generate the voltage signal at the first control assembly terminal VIN place of switch control rule assembly 206; PWM generation module export modulation signal (namely, PWM waveform in Fig. 3) for high level (namely, system power switch MOS FET conducting) time K switch 1 conducting, the voltage signal at the first control assembly terminal VIN place of switch control rule assembly 206 generates I_source electric current by the first trsanscondutance amplifier GM1 and charges to capacitor C, and the reference signal Vth_ovp of self-generated reference signal generation module is discharged to capacitor C by the second trsanscondutance amplifier GM2 generation I_sink electric current simultaneously; If I_source > is I_sink, then the voltage Vramp on capacitor C rises; PWM generation module export control signal (namely, PWM waveform in Fig. 3) for low level (namely, system power switch MOS FET end and inductor L1 demagnetize) time K switch 1 end, now only have the reference signal Vth_ovp of self-generated reference signal generation module to generate I_sink electric current by the second trsanscondutance amplifier GM2 to discharge to capacitor C, the voltage Vramp on capacitor C declines.
After inductor L1 demagnetizes at every turn and terminates, compare Vramp voltage by comparator COMP1 and Vth_ovp voltage judges whether to need to trigger overvoltage protection (OVP) (such as, if Vramp is higher than Vth_ovp, then triggering OVP).After comparing end at every turn, by reset cell by the voltage Vramp enforced reset on capacitor C to Vth_ovp.
Here, the voltage signal at the first control assembly terminal VIN place of switch control rule assembly 206 can draw according to equation (5).
Equation (5)
Output voltage V between two outputs of electric current output precision 208
oUTbe in critical OVP voltage (V
oUT_OVP) time, T in each cycle that charging and discharging is carried out to inductor L1
oNin time to the charging voltage of capacitor C and within the demagnetization time to the discharge voltage of capacitor C equal (as Suo Shi equation (6)):
In conjunction with equation (4) to (6), equation (7) can be drawn:
From the above; Vramp and Vth_ovp is compared at the end of being demagnetized by inductor L1 in each cycle of carrying out charging and discharging to inductor L1; and Vramp higher than during Vth_ovp trigger OVP (; the output of the second control assembly terminal GATE of closing switch control assembly 206 immediately), high-precision overvoltage protection can be realized.Here, critical OVP voltage V
oUT_OVPcan be the output capacitance C in electric current output precision 206
oUTrated voltage, can according to critical OVP voltage V
oUT_OVPwith reference signal V
th_ovpprecompute required R1 and R2 ratio.
Can find out, disclosed herein is so a kind of output voltage control method and comprise: utilize and characterize whether in running order control signal generation voltage sense signal (that is, Vramp) of one or more LED; Voltage (that is, the V that the voltage indicate voltage sense signal and reference signal indicate
th_ovp) compare, and judge that whether output voltage is higher than scheduled voltage according to comparative result; When output voltage is higher than scheduled voltage, utilize control signal (that is, above-mentioned modulation signal) shutdown system power switch (that is, above-mentioned MOSFET).
It will be understood by those skilled in the art that the more Alternate embodiments and the improved procedure that also exist and can be used in the present invention embodiment, and above-mentioned execution mode and example are only the explanations of one or more embodiment.Therefore, scope of the present invention is only limited by appended claims.
Claims (10)
1., for providing a system for output current to one or more light-emitting diode, comprising:
Switch control rule assembly, the information be configured to according to being associated with sensing signal, demagnetization signal, sampled signal and reference signal generates control signal, and utilizes described control signal to come cut-off and the 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, described diode also comprises the second diode terminal, described inductor also comprises the second inductor terminals, and described one or more light-emitting diode and output capacitance are connected in parallel between described second diode terminal and described second inductor terminals
Described sensing signal flows through the electric current generation of described system power switch by sensing, described demagnetization signal flows through the electric current generation of described inductor by sensing, described sampled signal is generated by the voltage at the described second diode terminal place that samples, and described reference signal is prearranged signals.
2. system according to claim 1, is characterized in that, described switch control rule assembly is also configured to:
Information according to being associated with described sensing signal and described demagnetization signal generates modulation signal, and when described one or more light-emitting diode to be connected between described second diode terminal and described second inductor terminals and to be in running order using described modulation signal as described control signal to control conducting and the cut-off of described system power switch, and
Information according to being associated with described demagnetization signal, described sampled signal, described reference signal and described modulation signal generates described control signal, and at described one or more light-emitting diode from the separated of described second diode terminal and described second inductor terminals or the conducting and the cut-off that control described system power switch when breaking down according to described control signal.
3. system according to claim 1, is characterized in that, also comprises:
AC rectification assembly, is configured to carry out rectification to generate the voltage signal after rectification to the AC signal from AC power;
Electric resistance partial pressure assembly, is configured to carry out dividing potential drop to generate the voltage signal entering described switch control rule assembly to described sampled signal, wherein
Described AC rectification assembly comprises first, second, third and the 4th rectifier stack terminal, described first and second rectifier stack terminals are connected with the two ends of described AC power respectively, described 3rd rectifier stack terminal and described second inductor ends sub-connection, and described 4th rectifier stack connecting terminals receives ground
Described electric resistance partial pressure assembly comprises first, second and the 3rd dividing potential drop pack terminals, described first dividing potential drop pack terminals is connected with described second diode terminal, described second dividing potential drop pack terminals is connected to ground, and described 3rd dividing potential drop pack terminals provides the voltage signal entering described switch control rule assembly.
4. system according to claim 2, is characterized in that, described switch control rule assembly comprises switch, the first trsanscondutance amplifier, the second trsanscondutance amplifier, comparator, the first capacitor and reset cell, wherein
The conducting of described switch is controlled by described control signal with cut-off,
Described first trsanscondutance amplifier, during described switch conduction, utilizes the voltage signal entering described switch control rule assembly from outside to generate the first electric current, in order to charge to described first capacitor,
Described second trsanscondutance amplifier, during described switch conduction and during the demagnetization period of described demagnetization signal instruction, utilizes described reference signal to generate the second electric current, in order to described first discharging capacitors,
The voltage that the current voltage of described comparator at the end of described demagnetization signal instruction demagnetization on more described first capacitor and described reference signal indicate, and generate described control signal according to comparative result,
Described reset cell when described comparator completes comparing of the voltage that the current voltage on described first capacitor indicates with described reference signal, by the voltage that the current voltage forced resetting on described first capacitor indicates to described reference signal.
5. system according to claim 4, is characterized in that, when the voltage that the current voltage on described first capacitor indicates higher than described reference signal, described switch control rule assembly generates the described control signal in order to end described system power switch.
6. system according to claim 5, is characterized in that, the voltage of described reference signal instruction is not more than the product of the scale factor of the voltage preset for described output capacitance and the circuit structure depending on described system.
7. system according to claim 1, is characterized in that, being connected with described second diode terminal via resistance for the terminal from external reception electric energy of described switch control rule assembly, and is connected to ground via the second capacitor.
8. system according to claim 1, is characterized in that, being directly connected with described second diode terminal for the terminal from external reception electric energy of described switch control rule assembly.
9. control the method being used for the output voltage that the system of output current is provided to one or more light-emitting diode, comprising:
Utilize and characterize the whether in running order control signal generation voltage sense signal of described one or more light-emitting diode;
The voltage that the voltage indicate described voltage sense signal and reference signal indicate compares, and judges that whether the output voltage of described system is higher than scheduled voltage according to comparative result;
When the output voltage of described system is higher than described scheduled voltage, described control signal is utilized to end system power switch in described system, wherein
Described control signal generates according to the information be associated with sensing signal, demagnetization signal, sampled signal and described reference signal, described sensing signal flows through the electric current generation of described system power switch by sensing, described demagnetization signal generates by sensing the electric current flowing through the inductor be connected in series with described system power switch, described sampled signal is generated by the voltage at described one or more light-emitting diode one end place that samples, and described reference signal is prearranged signals.
10. method according to claim 9, it is characterized in that, the voltage of described reference signal instruction is not more than the voltage that presets for the output capacitance be connected in parallel with described one or more light-emitting diode and the product of scale factor of circuit structure depending on described system.
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| 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 |
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| 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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| CN105655985A (en) * | 2016-03-29 | 2016-06-08 | 昂宝电子（上海）有限公司 | Overvoltage protection system and method for LED lighting |
| CN106413173A (en) * | 2016-06-22 | 2017-02-15 | 上海晶丰明源半导体有限公司 | Pulse width modulation control signal light modulation control circuit and method, and LED driving system |
| CN106686831A (en) * | 2017-02-24 | 2017-05-17 | 上海晶丰明源半导体股份有限公司 | Output open circuit protection circuit and silicon controlled dimming LED drive system and method |
| 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105392231B (en) | 2017-10-31 |
| TWI583120B (en) | 2017-05-11 |
| TW201722056A (en) | 2017-06-16 |
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