CN102917503A - LED driver system with energy storage function - Google Patents
LED driver system with energy storage function Download PDFInfo
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- CN102917503A CN102917503A CN2012104133516A CN201210413351A CN102917503A CN 102917503 A CN102917503 A CN 102917503A CN 2012104133516 A CN2012104133516 A CN 2012104133516A CN 201210413351 A CN201210413351 A CN 201210413351A CN 102917503 A CN102917503 A CN 102917503A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 55
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 92
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000007600 charging Methods 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 31
- 238000012876 topography Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
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- 238000005286 illumination Methods 0.000 description 11
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- 238000013021 overheating Methods 0.000 description 6
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- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
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- 150000002641 lithium Chemical class 0.000 description 1
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention relates to an LED driver system with an energy storage function. The LED driver system can work in three working modes. In an illuminating mode, input alternating-current power is outputted to a constant-current/constant-voltage outputting AC-DC converter with a power factor correction function to directly power an LED lamp; in a charging mode, the LED lamp stops working, inputted alternating-current power is supplied for a lithium battery pack module via the AC-DC converter, and energy is stored; and in a battery power supply mode, a charged lithium battery management module supplies power for the LED lamp via a constant-current outputting DC-DC converter. The LED driver system further comprises an intelligent switching module, switching among the three modes is realized under the control of a single chip microcomputer, the three modes are guaranteed against being interfered by one another, and normal running of the integral system is guaranteed. The power factor of the LED driver system can be higher than 0.9, the efficiency of the LED driver system is higher than 80%, the LED lamp can be powered continuously for a long time when in power failure, and normal operation of the LED lamp during power interruption is guaranteed.
Description
Technical field
The present invention relates to a kind of led driver system, especially relate to a kind of energy storage led driver system.
Background technology
Along with the high speed development of industry, the demand to the energy in the society sharply increases, and particularly can often show a deficiency at concerned power, can take the city margining electric method in some industrial flourishing city, and this has had a strong impact on the normal life order in city.Thereby the power-saving technology particularly technology of electric power energy-saving aspect becomes current study hotspot.Under this background, the LED lighting technology is arisen at the historic moment, and the trend that replaces existing general lighting technology is arranged.In today that the energy and environmental problem become increasingly conspicuous, the effect of energy-saving and emission-reduction is more aobvious important, and is also very urgent to the demand of LED illumination.Under the incomplete prerequisite of the alternative energy, how existing non-renewable energy resources are more effectively utilized, be the effective way that solves present energy shortage problem.The series of advantages such as the LED lamp is efficient owing to having, energy-saving and environmental protection become the focus of country, area and relevant enterprise industry development and concern.It is as most important parts in the semiconductor lighting technology, is more accepted extensively by market because have energy-saving and environmental protection, long-life, the lot of advantages such as non-maintaining.Driving power circuit in the LED light fixture is the important component part of LED product, no matter in illumination, backlight or display panel field, has all obtained widely market application.
Because in the research of present LED illumination and in the industrialization stage, play conclusive effect at whole LED lamp in useful life the useful life of LED driving power, and the LED driving power that works out high efficiency and high reliability becomes needs the preferential key issue that solves in the present LED industry.Had that its guarantee LED is stable, high efficiency and long-life work and operation.
Because the exclusive electrical characteristic of LED illuminating lamp so that the LED driving power circuit faces larger challenge, adds that be 100,000 hours the theoretical service life of LED lamp, the LED driving power that therefore requires to join is because having very high reliability.In order to prevent the in advance damage of LED lamp, require designed circuit control system can accurately control the output current size of LED driving power.And the relatively poor shortcoming of voltage stabilizing drive circuit ubiquity current stabilization ability that adopts on the market at present, thereby so that the life-span of the LED lamp that drives shorten dramatically.
The quality of LED constant-current driving power supply technology is directly connected to uniformity and the consistency of high-powered LED lamp brightness.In the application of portable product, along with the gradually reduction of supply voltage, we need the brightness of LED lamp constant, and that just requires the LED driving power circuit should have very high current precision, change because very little curent change all can cause the brightness of LED lamp.So using on the LED light fixture of mains-supplied, because the frequent fluctuation of line voltage even require the LED driving power in the situation of mains voltage variations, also can have high-precision driving power constant current output characteristic.In addition, because the high-powered LED lamp heating is severe, and can be along with the variation of ambient temperature, the output current of driving power also can drift about.These all require the high-power LED driving power source circuit that stable high-precision LED constant current output electric current can be provided.
Different from incandescent lamp, the LED device must be that galvanic current just can be worked with AC rectification by Switching Power Supply, and therefore the high-capacity LED illuminating device in family expenses or public place use need to use Switching Power Supply usually.Although switching power circuit efficient is higher, because its rectification circuit is nonlinear circuit, can cause a large amount of current harmonicss to pollute to electrical network, the capacitive filtering element in its circuit also can reduce the power factor of circuit, increases the electrical network burden and causes harmonic pollution.Therefore generally require the slightly larger LED driving power circuit of power all should have the High Power Factor function.
In illumination was used, if demanded power output is higher than 25W, led driver then was faced with the problem of power factor correction (PFC).As in U.S.'s " Energy Star " project solid-state illumination standard to PFC with Compulsory Feature (and no matter being which kind of power grade), namely require power factor to be higher than 0.7 for the dwelling house applying portion, and require power factor to be higher than 0.9 for commercial applying portion.And the power factor of general Switching Power Supply is usually lower, only has and has used the PFC(power factor correction) Switching Power Supply of technology just can have very high power factor.
What existing LED driving power was mainly pursued at aspect of performance is the size of power output and the stability of output, and the performance of aspect power factor and efficient, not getting well, design obtains High Power Factor, high efficiency LED driving power is the only way of its design, if circut breaking occurs suddenly in addition, current LED driving power can not be continuously the LED power supply, so LED can't normally move when outage, thereby the inconvenience that occurs under the power-off condition occurring to carry out room lighting at civil power, design obtains having the LED driving power of energy-storage function, then can address this problem preferably.
Summary of the invention
The present invention solves the existing technical problem of prior art; A kind of employing voltage follow PFC technology is provided, the switching tube turn-off time has been fixed, guaranteed that whole topology is operated in the DCM pattern, so just can realize High Power Factor (PF) with a simple one-level topology.After tested, the power factor of LED driving power of the present invention can reach more than 0.9.And after adding this PFC control circuit, the efficient of AC-DC converter has still reached a kind of energy storage led driver system more than 80%.
It is to solve the existing technical problem of prior art that the present invention also has a purpose; A kind of switching that can realize constant current/constant voltage (CC/CV) pattern is provided, in light illumination mode, has been operated in the CC pattern, directly LED has been powered.In charge mode, be operated in the CV pattern, to the power supply of lithium electricity energy-storage system, carry out a kind of energy storage led driver system of energy storage.
It is to solve the existing technical problem of prior art that the present invention has a purpose again; A kind of can be when LED turn-offs high efficiency energy storage with input is provided, continue when making things convenient for the power supply supply discontinuity LED is powered, multipotency is kept power supply in 48 hours, enough satisfies a kind of energy storage led driver system of the need for electricity of domestic consumer when power interruptions.
It is to solve the existing technical problem of prior art that the present invention also has a purpose; Provide a kind of and the output of high pressure lithium electricity energy-storage system can be converted to constant current and export the driving LED lamp, and conversion efficiency is in a kind of energy storage led driver system more than 80%.
It is to solve the existing technical problem of prior art that the present invention has a purpose at last; Provide that a kind of can be operated in 3 patterns be light illumination mode, charge mode and battery powered mode, and adopt 8 single-chip microcomputers to form an intelligent handover module, make the LED driving power can be in 3 patterns a kind of energy storage led driver system of switching of intelligence.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of energy storage led driver system is characterized in that, comprising:
AC-DC converter: will input the high pressure low-frequency ac signal and be transformed to low-voltage dc signal and power to LED; And power to energy storage and charge-discharge system by alternating current;
Energy storage and charge-discharge system: the reserve power of inside is powered to LED;
DC-DC converter: power to LED after the reserve power of energy storage and charge-discharge system is converted to Constant Direct Current;
Intelligent control module: be connected with the AC detection module, detect whether the input of interchange is arranged; Select module to be connected with the LED power supply, the switching of control LED power supply; Be connected with the AC-DC module, detection LED extinguishes or opens;
And AC-DC converter, a DC-DC converter are connected the channel selection circuit that is used for control LED electrical source exchange with intelligent control module.
The present invention has 3 mode of operations, i.e. light illumination mode, charge mode and battery powered mode.In light illumination mode, the alternating current input is directly powered to LED by constant current/constant voltage (CC/CV) the output AC-DC converter with Active PFC (PFC) function, and this moment, the AC-DC converter was operated in the CC pattern; In charge mode, LED quits work, and the alternating current input to the power supply of lithium battery administration module, is carried out energy storage by the AC-DC converter, and this moment, the AC-DC converter was operated in the CV pattern; In battery powered mode, charged lithium battery administration module is powered to LED after by a DC-DC converter that constant current output arranged.In order to realize the switching between these three kinds of patterns, the present invention has designed an intelligent control module, realizes guaranteeing the switching of three kinds of patterns not interfere with each other between three kinds of patterns by monolithic processor controlled mode, and whole system is normally moved.The overall plan of system as shown in Figure 1.
In above-mentioned a kind of energy storage led driver system, described AC-DC converter comprises:
Control module in the sheet;
The main topography module that is connected with control module in the sheet: comprise the inverse-excitation type translation circuit, be about to output signal and be reflected in respectively on limit, source main coil and the secondary coil by limit, transformer source feedback, then this feedback signal is collected in the sheet in the control module.
What main topography module adopted is the inverse-excitation type translation circuit of limit, source feedback form, and circuit working is in interrupted (DCM) pattern.Its principle is as follows: the high pressure low-frequency ac signal of ac input end input at first converts high-voltage dc signal to by a full bridge rectifier, is input to limit, transformer source after capacitor C 1 filtering.By unlatching and the shutoff of sheet inner control circuit control switch pipe P1, this high-voltage dc signal is converted into the AC signal of high frequency, then passes through transformer, forms the low-voltage signal of a high frequency at output.Current rectifying and wave filtering circuit by output converts low-voltage dc signal at last.For keeping the stable of output, main topology has increased limit, source secondary coil, output signal is reflected in respectively on limit, source main coil and the secondary coil by limit, transformer source feedback, then this feedback signal is collected in the sheet inner control circuit, thereby switching tube P1 is controlled.
Control module adopts current feedback and two kinds of forms of Voltage Feedback in the sheet, can realize the switching of the constant current/constant voltage (CC/CV) exported.Its specific works principle is as follows: after whole control circuit obtained externally fed and enabling signal by VDD, STP pin, circuit entered the soft start state.The voltage of step rises so that the switching tube electric current becomes greatly gradually, enters at last normal operating conditions.During normal operation, control circuit gathers respectively the feedback current of limit, source main coil and the feedback voltage of limit, source secondary coil by CS and FB pin.Feedback current converts voltage signal to by the resistor network that CS pin periphery connects.The signal that the CS pin gathers is sent into a logic control circuit by behind the lead-edge-blanking circuit (LEB).The effect of lead-edge-blanking circuit is to prevent because the current spike that the unlatching of switching tube and shutdown moment produce and generation current wrong report.The signal that the FB pin gathers forms error amplification signal and sends into logic control circuit by the error between error amplifier amplification and the reference voltage.The DSEN pin gathers the feedback voltage of limit, source secondary coil, when the output normal operation (normal operation of LED lamp), DSEN pin voltage is in normal range (NR), this moment, the CC/CV switch was operated under the CC pattern, control logic circuit makes the conducting of feedback current path, and turn-offing the feedback voltage path, the CC/CV pin is exported high level simultaneously.Under the CC pattern, the feedback current path signal enters pwm signal generator module, by with the overcurrent limit value relatively after, form pwm control signal.Be used for driving the moving circuit of follow-up floppy drive after pwm signal process level shift and the logical process, and then the state of control switch pipe.The purpose that adds the moving circuit of floppy drive is in order to delay the turn on process of device for power switching, thereby reduces the EMI level of system.Because system's control loop sampling is the feedback signal of output current, so under the CC pattern, output current is precisely controlled, is in stable state always; When output no-load (shutoff of LED lamp), because output voltage sharply raises, the voltage of DSEN pin exceeds normal range (NR), this moment, the CC/CV switch was operated under the CV pattern, control logic circuit makes the conducting of feedback voltage path, and shutoff feedback current path, simultaneously CC/CV pin output low level.Under the CV pattern, the feedback voltage path signal enters pwm signal generator module, and produces pwm control signal after the overpressure value.Be used for driving the moving circuit of follow-up floppy drive after pwm signal process level shift and the logical process, and then the state of control switch pipe.Because the feedback control loop sampling is the feedback signal of output voltage under the CV pattern, so in the whole service process, output voltage is precisely controlled, is in stable state always.
What the Active PFC of AC-DC converter (PFC) function adopted is voltage follower PFC technology.Because the main topology of AC-DC converter is operated under the DCM pattern, is known limit, source main coil inductance peak current by inductance equation under the DCM pattern
V wherein
InLimit, expression source input direct voltage, L represents limit, source main coil inductance value, t
OnThe ON time of expression switching tube P1.Making power factor is 1, must keep input current and input voltage same-phase.But because input current can not reach sinusoidal, so method is inadvisable.Experiment shows, if inductance peak current value and input voltage value are proportional, as shown in Figure 4, power factor can reach more than 0.9.Thereby limit, source main coil inductance peak current I
PK=KV
In, wherein K represents proportionality coefficient, with above-mentioned two formula simultaneous as can be known, and t
On=KL is constant.So only need the ON time of maintained switch pipe P1 certain, and keep main topology and be operated in the DCM pattern, then the inductance peak current will be proportional with input voltage value.By weber law of conservation know V
InT
On=V
oT
Off, t wherein
OffExpression switching tube P1 turn-off time, and V
InAnd V
oAll the time same-phase can reach requirement so only need to fix the turn-off time.By the control of turn-off time control module to the turn-off time, whole system has realized input current to the following of input voltage, thereby has realized high power factor.
The physical circuit of the PFC of the present invention's design as shown in Figures 2 and 3.This pfc circuit mainly is comprised of control section in the outer topology part of sheet and the sheet.The outer topology part of sheet is exactly aforesaid AC-DC transformation topology, does not do at this and gives unnecessary details.Control section mainly is comprised of PWM controller and turn-off time controller in the sheet, and the turn-off time controller as shown in Figure 5.Wherein the turn-off time controller is comprised of rest-set flip-flop and timer.By foregoing PFC control principle as can be known, only need the turn-off time of floatless switch pipe, guarantee that the outer topology of sheet is operated in the DCM pattern, the envelope of input current just can be followed the variation of voltage and change, thereby be reached higher power factor.After tested, the pfc circuit of the present invention's design can make the power factor of converter reach more than 0.9.In addition, for the efficient that guarantees converter is unlikely to reduce too much, the efficient of converter is tested, by effectiveness formula
The efficient of this converter has reached more than 80% after tested.
In above-mentioned a kind of energy storage led driver system, described energy storage and charge-discharge system comprise that lithium battery power management module, battery equalizing circuit, lithium battery group, discharge circuit, charging circuit, temperature sensing circuit, current detection circuit and battery current foldback circuit form, and wherein the lithium battery power management module links to each other with battery equalizing circuit, discharge circuit, charging circuit, temperature sensing circuit, current detection circuit and battery current foldback circuit respectively; Battery equalizing circuit links to each other with the lithium battery group with the lithium battery power management module respectively; The lithium battery group links to each other with battery current foldback circuit, battery equalizing circuit and current detection circuit respectively; Discharge circuit links to each other with the lithium battery power management module; Charging circuit links to each other with current detection circuit with the lithium battery power management module; Temperature sensing circuit links to each other with the lithium battery power management module; Current detection circuit links to each other with charging circuit with the lithium battery power management module respectively; The battery current foldback circuit links to each other with the lithium battery group with the lithium battery power management module respectively.
In above-mentioned a kind of energy storage led driver system, described lithium battery power management module is mainly by lithium battery monitoring management the electric circuit constitute, the major function of this module is exactly that the collection signal that outside Acquisition Circuit is sent here is carried out the A/D conversion, then transfer to internal processor and calculate through corresponding, thereby estimate the voltage, electric current, temperature, residual capacity etc. of battery.Then compare with separately thresholding, judge and to make which control to battery.
In above-mentioned a kind of energy storage led driver system, described battery equalizing circuit has two kinds of balanced loops: a kind of is the balanced loop that is built in the lithium battery power management module, and the discharging current in balanced loop is approximately 10-15mA.Another kind is the external balanced loop that metal-oxide-semiconductor field effect transistor and resistance consist of.Each joint lithium battery all has this two kinds of balanced loops.But for the consideration to temperature, what the present invention selected is the balanced loop of external metal-oxide-semiconductor field effect transistor, can relatively large euqalizing current be set by current-limiting resistance.Under the control of this lithium battery monitoring management circuit, circuit can be recharged at battery, or under the idle state battery electric quantity in the battery pack is carried out equilibrium treatment, by being connected in parallel on the MOSFET on each battery, the battery of overtension carries out discharge process during with charging or discharge, the voltage of each battery is consistent, to reach the service efficiency that improves battery pack and the purpose in useful life.
In above-mentioned a kind of energy storage led driver system, described lithium battery group is composed in series by some joint lithium batteries, consists of the carrier of energy storage, and it gets up electrical power storage in the situation of mains-supplied, in the time of outage as the power supply of LED lamp.Also can by this programme expansion is used, carry out energy storage to the battery pack of multisection lithium battery.
Discharge circuit and charging circuit mainly are comprised of in conjunction with some peripheral circuits MOSFET.Its major function is to the lithium battery control of discharging, charge under the control of lithium battery power management module.When there are electricity and battery electric quantity deficiency in the external world, according to current voltage, charging current is claimed, charge switch is opened, to batteries charging, storage power; When reaching the fullcharging electric weight of battery, stop charging; When the external world cut off the power supply, discharge switch was opened, and battery power discharge makes the LED normal operation.It is that accurately constant current source is with the driving lightening LED lamp that described DC-DC converter is used for voltage transitions with lithium battery output.This module adopts the Buck structure of mode PWM controlled.The transistor of quick break-make is placed between the input and output, recently control the mean value of output dc voltage by regulating duty.
Temperature sensing circuit is made of thermistor and protective resistance, and the major function of this circuit is to detect the working temperature of lithium battery management system and lithium battery itself, and the lithium battery power management module determines whether to finish the work of lithium battery by the height of judging temperature.
Current detection circuit is unified a little discrete resistance electric capacity by high accuracy, high-power sampled resistance junction and is formed.The lithium battery power management module obtains the operating current size by the voltage that gathers on the sample resistance, and the lithium battery power management module is judged whether trouble free service of battery by the size of analytical work pattern and operating current.
The battery current foldback circuit is when system short circuit occurs and causes electric current excessive, makes timely fuse melting, protection lithium battery and security of system.
In above-mentioned a kind of energy storage led driver system, described DC-DC converter comprises Buck converter topology structural circuit and the control module PWM chip that is connected with Buck converter topology structural circuit.
Control module PWM chip includes oscillating circuit OSC, detects resistance R
S1And R
S2, comparison circuit, slope compensation circuit, current foldback circuit, overheating protection circuit and under-voltage protecting circuit.Control module PWM chip has adopted current control mode.Oscillating circuit OSC is for generation of the square-wave pulse of constant frequency and constant duty ratio.Detect resistance R
S1And R
S2Detect respectively the electric current of respective branch, be input to comparison circuit after being converted to voltage signal, then with corresponding reference voltage relatively, thereby controlled signal.Control signal is delivered to logic control circuit, is used for the duty ratio of control wave.Then slope compensation circuit compares with error signal for generation of the slope reference voltage, realizes more accurate FEEDBACK CONTROL.
The Buck converter topology structure that is connected with the PWM chip comprises that mainly the power MOS pipe that places in the PWM chip is as switching device Q, inductance L, sustained diode, input filter capacitor C
INWith output filter capacitor C
OUTThis circuit working is in the CCM pattern.Switching device Q is subjected to the square wave pulse control of constant frequency, controls the mean value of output dc voltage by the ON time of by-pass cock.The inductance value size of inductance L affects the slope of ripple.Sustained diode is kept the conducting in inductive current loop at the switch blocking interval.Input filter capacitor C
INWith output filter C
OUTThe ripple of filtering voltage.
The PWM controller includes oscillating circuit OSC, detects resistance R
S1And R
S2, comparison circuit, slope compensation circuit, current foldback circuit, overheating protection circuit and under-voltage protecting circuit.The PWM controller has adopted current control mode.Oscillating circuit OSC is for generation of the square-wave pulse of constant frequency and constant duty ratio.Detect resistance R
S1And R
S2Detect respectively the electric current of respective branch, be input to comparison circuit after being converted to voltage signal, then with corresponding reference voltage relatively, thereby controlled signal.Control signal is delivered to logic control circuit, is used for the duty ratio of control wave.Then slope compensation circuit compares with error signal for generation of the slope reference voltage, realizes more accurate FEEDBACK CONTROL.
Control module PWM chip has increased a current feedback loop on the basis of conventional voltage control model.This current feedback loop is with the detection resistance R
S2Connect the inductive current of sense switch conduction period with inductance L.Because during the switch conduction, the inductive current rate of rise is V
INSo/L is V
INLarger, the rate of climb is faster.At input voltage V
INJust this variation is fed back to control to the switch ON time when changing at the beginning, and just as voltage mode control in, feed back again control after waiting until the output current variation.So just obviously promote response speed, improved load current and adjusted performance, improved system reliability.The input of logic control circuit also has the clock signal of oscillating circuit generation and the control signal that overheating protection circuit, under-voltage protecting circuit are sent here.When temperature surpasses limit value, force comparator output control signal, by logic control circuit stopcock Q, discharge again the control to switch after temperature is normal.Under-voltage protecting circuit is input voltage when being lower than limit value, shutdown system.Improve the reliability and stability of circuit.Current foldback circuit can limit the electric current that flows through switching tube, makes it be controlled within the specified scope protective circuit safety.
The control module of described led driver is passed through I with the control chip of 8 single-chip microprocessor MCU as system
2The C bus is communicated by letter with protection module with the lithium battery monitoring, and two parts are by lithium battery power supply.MCU external pin and other module communications indicate as switching controls and state:
(1) is connected with the AC detection module, with the interrupt mode monitoring whether the input of interchange arranged;
(2) be connected the switching of control LED power supply with the channel selection circuit module;
(3) be connected with the AC-DC module, detection LED extinguishes or opens.
The characteristics of lithium battery monitoring management module: an integrated automatic Battery ProtectionEngin---BPE, BPE can independently realize overvoltage, and is under-voltage, short circuit, overcurrent, the circuit protection functions such as temperature.With " lithium battery is in the situation that abnormal condition need to be made protection " referred to as the protection event.The li-ion cell protection flow process is as follows: (1) MCU sets first the critical parameters of various protection events, with time of delay; (2) BPE judges according to critical parameters whether the protection event occurs, and automatically takes safeguard measure if BPE occurs; (3) MCU removing protection event indicates that guard time finishes.OC, UC protection: when electric current exceeds critical range, and continue to surpass to cut off time of delay and discharge and recharge FETS; OV, UV protection: after voltage exceeded critical range, BPE can cut off charge or discharge FET after time of delay.
Lithium cell charging: be charged to certain magnitude of voltage with the CC pattern first, be full of with the input of CV pattern again.But LED can only power with the CC pattern, thereby lithium battery can only charge when LED extinguishes.The AC-DC module can be finished the CC pattern automatically to the switching of CV pattern, and when lithium battery is full of, triggers overvoltage protection and disconnect charging FET complete charge.
Therefore, the present invention has following advantage: 1. adopt voltage follow PFC technology, the switching tube turn-off time is fixed, guarantee that whole topology is operated in the DCM pattern, so just can realize High Power Factor (PF) with a simple one-level topology.After tested, the power factor of LED driving power of the present invention can reach more than 0.9.And after adding this PFC control circuit, the efficient of AC-DC converter has still reached more than 80%; 2.AC-DC converter can be realized the switching of constant current/constant voltage (CC/CV) pattern, is operated in the CC pattern in light illumination mode, directly LED is powered.In charge mode, be operated in the CV pattern, to the power supply of lithium electricity energy-storage system, carry out energy storage; 3. the present invention comprises a lithium battery energy storage battery system, can be high efficiency with the energy storage of inputting when LED turn-offs, continue when making things convenient for the power supply supply discontinuity LED is powered.Through experiment, the multipotency of this energy-storage system is kept power supply in 48 hours, enough satisfies the need for electricity of domestic consumer when power interruptions; 4. the present invention comprises a high efficiency dc-to-dc converter, the output of high pressure lithium electricity energy-storage system can be converted to constant current and export the driving LED lamp, and conversion efficiency is more than 80%; 5. can be operated in 3 patterns is light illumination mode, charge mode and battery powered mode, and adopts 8 single-chip microcomputer MC9S08DZ32 to form an intelligent handover module, make the LED driving power can be in 3 patterns the switching of intelligence.
Description of drawings
Figure 1 shows that the overall plan of intelligent High Power Factor, high efficiency energy storage LED driving power source system.
Figure 2 shows that the main topological circuit of AC-DC converter in the LED driving power.
Figure 3 shows that the internal control circuit block diagram of AC-DC converter.
Figure 4 shows that the oscillogram of input voltage, peak current, average current and inductive current in the AC-DC module.
Figure 5 shows that the turn-off time controller of described AC-DC converter
Figure 6 shows that the hardware circuit diagram of the energy storage of LED driving power and charge-discharge system.
Figure 7 shows that battery module and battery equalizing circuit modular circuit schematic diagram.
Figure 8 shows that discharge circuit figure in energy storage and the charge-discharge system.
Figure 9 shows that charging circuit figure in energy storage and the charge-discharge system.
Figure 10 shows that the temperature sensing circuit figure in energy storage and the charge-discharge system.
Figure 11 shows that the current detection circuit figure in energy storage and the charge-discharge system.
Figure 12 shows that the battery current foldback circuit figure in energy storage and the charge-discharge system.
Figure 13 shows that the circuit theory diagrams of the DC-DC converter of LED driving power.
Figure 14 shows that the circuit theory diagrams of control module PWM chip in the DC-DC converter.
Figure 15 shows that DC-DC converter current waveform on inductance L, switch Q and the sustained diode under stable state.
Figure 16 shows that the specific implementation figure of the intelligent control module of LED driving power.
Figure 17 shows that and exchange the detection module circuit diagram in the intelligent control module.
Figure 18 shows that the main program flow schematic diagram of intelligent control module.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
The present invention is described in further detail below in conjunction with accompanying drawing and embodiment.
The AC-DC conversion fraction circuit theory diagrams of this energy storage led driver system as shown in Figure 2.It mainly comprises control module in the outer main topography module of sheet and the sheet.Main topography module operation principle is as follows: diode D1, D2, D3, D4 form full bridge rectifier, convert the high-voltage alternating input to the high voltage direct current input.High voltage direct current input voltage is after capacitor C 1 filtering, and radio-frequency component is filtered, and then is added on the main coil of limit, source.When power switch pipe P1 conducting, limit, source main coil current flowing, and through sampling network R11 and R12, limit, source main coil current is sampled into the CS pin of sheet inner control circuit, this moment, secondary coil did not have electric current to flow through.When power switch pipe P1 turn-offs, limit, source main coil does not have electric current to flow through, because the anti-sharp effect of transformer, higher limit, source input voltage is converted into lower output end voltage, and the rectifying and wave-filtering network through D6, C5, R13 composition, become lower VD, and there be stabling current to flow through in the secondary coil this moment.Because main topography module has increased limit, source secondary coil, output voltage feeds back to the limit, source by limit, source secondary coil behind transformer.The output feedback voltage feeds back to the DSEN pin on the one hand by resistance pressure-dividing network R5, R6, is used for judging the situation of output loading; Feed back to the FB pin by resistance pressure-dividing network R7, R8 on the other hand, as the sampled signal of Voltage Feedback.
Because at the power switch pipe shutdown moment, limit, source main coil leakage inductance and switching tube junction capacitance resonance can produce very large shoving, form spike noise, so utilize R4, C2, D5 to form the RCD network, be used for suppressing spike and disturb.
The power supply of sheet inner control circuit powers and soft start for large capacitor C 4 chargings and input VDD and STP pin by DC input voitage after by resistor network R1, R2 when just powering on, behind stable output, powered by D7 and R3 by the feedback voltage of limit, source secondary coil.The effect of large capacitor C 4 is keep VDD and STP voltage stable.D8, R9, R10 form rectification circuit, and the switch controlled signal that the DRV pin is exported carries out rectification, makes the unlatching of switching tube and turn-offs precisely controlled.
The system block diagram of sheet inner control circuit as shown in Figure 3.After whole control circuit obtained externally fed and enabling signal by VDD, STP pin, circuit entered the soft start state.By the effect of soft-start module, control circuit enters normal operating conditions at last.During normal operation, current feedback signal and voltage feedback signal are introduced the sheet inner control circuit by pin CS and FB pin respectively.Current feedback signal enters control logic circuit after by a lead-edge-blanking circuit, and voltage feedback signal also enters control logic circuit after through an error amplifier.The output feedback signal of DSEN pin sampling by the CC/CV commutation circuit, is controlled control logic circuit, thereby unlatching and the shutoff of control current feedback path and voltage feedback paths realize the switching of CC/CV pattern.Form pwm control signal behind feedback signal (current feedback signal or voltage feedback signal) the process pwm signal generator through switching controls, this signal drives for subsequent conditioning circuit provides output behind level shift and Logic control module.In order to reduce the EMI level of system, control circuit has adopted the floppy drive braking technique, i.e. soft driver module among Fig. 3.At last in order to realize high PFC, behind soft driver module, increase a turn-off time control circuit, the maintained switch pipe has the fixing turn-off time, has so not only realized that input current is to the following but also can keep the main topology to be operated in the DCM pattern of input voltage always, as shown in Figure 4.
The hardware circuit design block diagram of energy storage of the present invention and charge-discharge system as shown in Figure 6.Formed by lithium battery power management module, battery balanced module, discharge switch module, charge switch module, temperature detecting module, current detection module and battery overcurrent protection module.Wherein the lithium battery power management module links to each other with battery equalizing circuit, discharge circuit, charging circuit, temperature sensing circuit, current detection circuit and battery current foldback circuit respectively.Battery equalizing circuit links to each other with the lithium battery group with the lithium battery power management module respectively.The lithium battery group links to each other with battery current foldback circuit, battery equalizing circuit and current detection circuit respectively.Discharge circuit links to each other with the lithium battery power management module.Charging circuit links to each other with current detection circuit with the lithium battery power management module.Temperature sensing circuit links to each other with the lithium battery power management module.Current detection circuit links to each other with charging circuit with the lithium battery power management module respectively.The battery current foldback circuit links to each other with the lithium battery group with the lithium battery power management module respectively.
Fig. 7 is battery module and battery equalizing circuit modular circuit connection diagram.Battery module is that 13 joint lithium batteries are connected in series.A N-type MOSFET(Q1 in parallel on every batteries ~ Q13), the resistance of connecting again (RB1～RB13), can be by the size that arranges to control euqalizing current to this resistance sizes.Resistance R F0 ~ RF13 is current-limiting resistance, and control flows into the size of lithium battery monitoring management circuital current.CF1 ~ CF13 is filter capacitor.Under the control of lithium battery monitoring management circuit, circuit can be recharged at battery, or under the idle state battery electric quantity in the battery pack is carried out equilibrium treatment.It is too high to suppose to detect the first segment cell voltage, lithium battery monitoring management circuit is given the CB1 high level, make and be connected in parallel on Q1 conducting in parallel on the first segment battery, at this moment, first segment battery and resistance R B1 consist of the loop, have electric current to pass through, at resistance the consumption of energy is arranged, this process is namely carried out discharge process to this batteries.Same principle can be used every batteries, and the voltage of each battery is consistent, and reaches balanced purpose, service efficiency and the useful life that so just can improve battery pack.
Discharge circuit is comprised of MOSFET, voltage stabilizing didoe and more peripheral resistance and electric capacity as shown in Figure 8.When the external world cuts off the power supply, DSG output 12V high level, the M1 conducting, system enters discharge condition, and LED is powered.When having electricity or the energy content of battery, the external world exports when complete, DSG pin output 0V low level, and M1 closes, and system stops discharge.
Charging circuit is comprised of in conjunction with more peripheral resistance, electric capacity and voltage stabilizing didoe a plurality of MOSFET as shown in Figure 9.Its major function is to the lithium battery control of charging under the control of lithium battery monitoring management module.When there are electricity and battery electric quantity deficiency in the external world, lithium battery monitoring management circuit makes the electric current of CHG pin output 5uA according to current voltage, and R15 and R16 carry out dividing potential drop to the 12V voltage that V12 provides, M2 is opened, electric current arrives MCHG1 by M2 and R17, and MCHG1 is opened, and system begins charging and storage power, when reaching the fullcharging electric weight of battery, CHG pin output high-impedance state, M2 can not conductings, stop charging.
Temperature sensing circuit as shown in figure 10; formed by a thermistor RT1 and a protective resistance R19; this circuit provides operating voltage by lithium battery monitoring and protection circuit; the resistance of RT1 changes with real time temperature; the voltage at its two ends also changes thereupon; this is so that lithium battery monitoring and protection circuit can the variation of sense temperature by the variation that detects voltage; then judge whether working temperature safety whether of system; if exceed the thresholding of setting; then control protection switch system is quit work, to reach the Real Time Monitoring temperature and to protect the purpose of battery system.
Current detection circuit is unified a little discrete resistance electric capacity by high accuracy, high-power sampled resistance junction and is formed as shown in figure 11.Lithium battery monitoring management circuit obtains the operating current size by gathering the voltage on the sample resistance (RSENSE1 and RSENSE2) by processing, and then judges whether trouble free service of battery by the size of analytical work pattern and operating current.
The battery current foldback circuit is comprised of insurance, MOSFET and peripheral resistance and electric capacity as shown in figure 12.Lithium battery monitoring management circuit control switch mosfet, when lithium battery monitoring management electric circuit inspection is subject to the threat of the factors such as overvoltage, under-voltage, overcurrent, short circuit, excess temperature to cell safety, send high level to PF and make the protective circuit conducting, disconnect controlled insurance F1; When system is short-circuited when causing electric current excessive, the insurance F1 in the protective circuit also can fuse, thus the safety of protection battery and circuit system.
DC-DC converter circuit schematic diagram of the present invention as shown in figure 13, the Buck converter topology structure that mainly comprises control module PWM chip and be connected with the PWM chip.Control module PWM chip circuit schematic diagram includes the detection resistance R as shown in figure 14
S1And R
S2, comparison circuit, oscillating circuit OSC, slope compensation circuit, overheating protection circuit, under-voltage protecting circuit and current foldback circuit.Control module PWM chip has adopted current control mode.
The Buck converter mainly comprises inductance L, sustained diode, input filter capacitor C
IN, output filter capacitor C
OUT, be built in addition the interior power MOS pipe of control module PWM chip as switching device Q.The power MOS pipe that is built in the control module PWM chip is the part of Buck converter topology structure as switching device Q, and the drain electrode of switching device Q is drawn by PWM chip VIN pin, is connected to input voltage V
INThe source electrode of switching device Q is drawn by PWM chip SW pin, is connected to the inductance of Buck converter topology structure.The resistance R of regulating impulse cycle T
ONOne terminates to input voltage V
IN, the other end is received the RON pin of PWM chip.The RON pin CS of PWM chip is used for resistance R is received in the output voltage sampling
LEDAnd R
S1Between.The RON pin GND ground connection of PWM chip.
Input voltage V
INThrough capacitor C
INBe input to the V of control module PWM chip after the filtering
INPin.Power switch Q in the PWM is controlled by the constant rectangular pulse of frequency.Pulse period, T passed through resistance R
ONThe resistance size adjustment.After T has decided, the duty ratio D=t of pulse
ON/ T mainly is subjected to ON time t
ONControl.Circuit works in two states, starting state and steady-working states after opening.
Under starting state, switch Q ON time t
ONIn, inductive current is from pressing slope V
IN/ L rises until switch turn-offs, and this moment, current instantaneous value did not also reach the peak I of current limit
PKSwitch Q closes and has no progeny, and inductive current is pressed slope V
O/ L descends, until next cycle arrives, switch is again conducting.V
OOutput voltage values, the V under the starting state
OThe V of value during than steady operation
OBe worth low, so descending slope is low during also than steady operation.To such an extent as to the electric current average I in whole state on the inductance
L_AVGConstantly rise.Until the current instantaneous value on the inductance in a certain cycle reaches limit value I
PK, circuit has just entered steady-working state.
Under steady-working state, the current waveform on inductance L, switch Q, the sustained diode as shown in figure 11, during switch Q conducting, sustained diode is turn-offed, electric current I
DBe 0.Inductive current I
LEqual to flow through the electric current I of switch
Q, all by slope V
IN/ L rises gradually.Simultaneously, load current is sampled delivers to feedback loop, carries out a series of logic relatively, works as I
LReach peak I
PKThe time make pulse put ' 0 ', stopcock.Input voltage V
INHigher, electric current I
LIt is faster to rise, and arrives peak I
PKTime shorter, ON time t
ONJust shorter.Otherwise V
INLower, ON time is longer.Thereby Limited Current is followed the fluctuation of input voltage and is changed.When switch Q turn-offs, there is not electric current to flow through switch.Sustained diode conducting this moment, inductive current I
LEqual to flow through the electric current I of diode D
D, by peak I
PKBeginning descends gradually, and descending slope is V
O/ L, V
OIt is output voltage values.Since constant output current, load R
LEDVariation only affect output voltage V
O, by
Select suitable inductance value, Δ I to inductance L
FIt is the current fluctuation amplitude.
In each cycle T, the electric current average I on the inductance
L_AVGConstant.And equal output current average I
O_AVGInductive current is through C
OUTOutput driving load R after the further filtering
LEDLuminous.Input voltage is through behind input filter, Current Feedback Control and the output filtering, and the electric current of inductance is kept constant.The control module PWM chip of DC-DC converter adopts current control mode, and implementation method has increased a current feedback loop as shown in figure 14 on the basis of conventional voltage control PWM.The realization of voltage control PWM is detecting resistance R
S1With load R
LEDSeries connection is I
OVariation be reflected to R
S1Both end voltage V
S1Variation, and feed back in the control module PWM chip.V
S1With reference voltage V
REFError originated from input amplifier GM1 obtains error signal V
EAn input as comparator GM2 in the current control circuit.The current feedback loop that increases is with the detection resistance R
S2Connect the inductive current of sense switch conduction period with inductance L.R
S2Both end voltage obtains voltage difference V after being input to comparator GM3
S2, the negative electricity pressure reduction V that obtains
S2Be added to and form slope reference signal V on the square-wave pulse
CS, again with V
CSWith the error signal V in the voltage control PWM loop
EThe as a comparison input of device GM2 obtains the final pulse-width control signal of current feedback loop.Pulse-width control signal is input to logic control circuit, the shutoff of control switch.The input of logic control circuit also has the clock signal of oscillating circuit generation and the control signal that overheating protection circuit, under-voltage protecting circuit are sent here.When temperature surpassed limit value, overheating protection circuit output control signal by logic control circuit stopcock Q, discharged again the control to switch after temperature is normal.Under-voltage protecting circuit is input voltage when being lower than limit value, shutdown system.Improve the reliability and stability of circuit.Current foldback circuit can limit the electric current that flows through switching tube, makes it be controlled within the specified scope protective circuit safety.
Intelligent control module design of the present invention is as follows:
1: the battery protection Functional Design:
Show that such as Figure 16 (the Li-ion battery among the figure is attached to the energy storage of LED driving power and charge-discharge system with protective circuit and lithium battery monitoring management system) MCU passes through I
2C bus and protection module communicate.A protection event mark register is arranged in the lithium battery monitoring management module, OV, UV, OC, SC, OT, UT totally 6 event flag positions are arranged.Need protection event critical parameters and the time of delay of setting as follows:
OC(Over Current) Control: need to set the critical upper limit of overcurrent protection event, delay time Over Current delay; SC(Short Circuit) Control: need to set the critical lower limit of short-circuit protection event, time of delay Short Current Delay.OV(Over Voltage) Control: need to set the critical upper limit of overvoltage protection event, time of delay OVUV Delay.UV(UnderVoltage) Control: need to set the critical lower limit of under-voltage protection event, time of delay OVUV Delay.OT(Over Temperature) and UT(Under Temperature) control: need to set inside and outside the excess temperature upper limit, inside and outside low temperature limits, time of delay OTUT Delay.
The 2:LED electrical source exchange: MCU external interrupt pin P1, GPIO pin P2 link to each other with the OUT end of AC input detection module as shown in figure 16, and P1 is as the power failure down trigger.P2 is as status scan, and low level has the input of interchange, and high level does not exchange input.GPIO pin P3 connects the control end that the LED power supply is selected module, selects the output power supply of AC-DC module during the output high level, and low level is selected lithium battery power supply.The lithium battery monitoring has a register to judge the charging and discharging state of battery for MCU with protection module.
3: battery charging control:
Lithium battery monitoring management module has one group of register, preserves the magnitude of voltage of each batteries, can by these registers of inquiry, whether need charging to judge battery.The GPIO pin P4 of MCU connects the CC/CV interface of AC-DC module as shown in figure 15, CC pattern LED normal operation during input high level, and CV pattern LED extinguishes during input low level.When P2=1 and P4=0, could charge for battery.When battery pack need to be charged, if when not having other protection events to occur, opening charging FET was the battery charging.
4: exchange detection module:
Exchange the detection module circuit and see accompanying drawing 17, two-way optocoupler can adopt circuit among the figure, also can adopt the integrated device such as LH1529 to do.When the alternating current input is arranged, divide the alternating current that obtains low pressure through R23 and R24, it is luminous to drive two LED lamps, the triode conducting, Out holds output low level; When inputting without alternating current, triode disconnects, Out end output high level.
5: main program flow
Main program flow chart is seen accompanying drawing 18, and rough flow process is as follows:
(1) initialization 1: the I that the lithium battery monitoring management is set
2The C bus address, the parameters such as sweep speed;
(2) initialization 2: set OC, SC, OT, UT, OV, UV critical value and time of delay;
(3) initialization 3: disconnect charging FET, remove the protection event flag, interrupt initialization;
(4) major cycle: cyclic process is referring to accompanying drawing 17;
(5) interrupt function: P1 is interrupted by the rising edge triggering MCU of low level to high level, and the LED power supply switches to lithium battery power supply fast by AC-DC output power supply.
Specific embodiment described herein only is to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (6)
1. an energy storage led driver system is characterized in that, comprising:
AC-DC converter: will input the high pressure low-frequency ac signal and be transformed to low-voltage dc signal and power to LED; And power to energy storage and charge-discharge system by alternating current;
Energy storage and charge-discharge system: the reserve power of inside is powered to LED;
DC-DC converter: power to LED after the reserve power of energy storage and charge-discharge system is converted to Constant Direct Current;
Intelligent control module: be connected with the AC detection module, detect whether the input of interchange is arranged; Select module to be connected with the LED power supply, the switching of control LED power supply; Be connected with the AC-DC module, detection LED extinguishes or opens;
And AC-DC converter, a DC-DC converter are connected the channel selection circuit that is used for control LED electrical source exchange with intelligent control module.
2. a kind of energy storage led driver according to claim 1 system is characterized in that described AC-DC converter comprises:
Control module in the sheet;
The main topography module that is connected with control module in the sheet: comprise the inverse-excitation type translation circuit, be about to output signal and be reflected in respectively on limit, source main coil and the secondary coil by limit, transformer source feedback, then this feedback signal is collected in the sheet in the control module.
3. a kind of energy storage led driver according to claim 1 system, it is characterized in that, described energy storage and charge-discharge system comprise that lithium battery power management module, battery equalizing circuit, lithium battery group, discharge circuit, charging circuit, temperature sensing circuit, current detection circuit and battery current foldback circuit form, and wherein the lithium battery power management module links to each other with battery equalizing circuit, discharge circuit, charging circuit, temperature sensing circuit, current detection circuit and battery current foldback circuit respectively; Battery equalizing circuit links to each other with the lithium battery group with the lithium battery power management module respectively; The lithium battery group links to each other with battery current foldback circuit, battery equalizing circuit and current detection circuit respectively; Discharge circuit links to each other with the lithium battery power management module; Charging circuit links to each other with current detection circuit with the lithium battery power management module; Temperature sensing circuit links to each other with the lithium battery power management module; Current detection circuit links to each other with charging circuit with the lithium battery power management module respectively; The battery current foldback circuit links to each other with the lithium battery group with the lithium battery power management module respectively.
4. a kind of energy storage led driver according to claim 3 system is characterized in that described lithium battery group is composed in series by some joint lithium batteries, consists of the carrier of energy storage.
5. a kind of energy storage led driver according to claim 4 system, it is characterized in that, described battery equalizing circuit comprises the first balanced loop and the second balanced loop: the described first balanced loop is built in the lithium battery power management module, and discharging current is 10mA-15mA; The second balanced loop is the external balanced loop that metal-oxide-semiconductor field effect transistor and resistance consist of; Above-mentioned each joint lithium battery all is provided with the first balanced loop and the second balanced loop.
6. a kind of energy storage led driver according to claim 1 system is characterized in that described DC-DC converter comprises Buck converter topology structural circuit and the control module PWM chip that is connected with Buck converter topology structural circuit.
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| CN201210413351.6A CN102917503B (en) | 2012-10-25 | 2012-10-25 | LED driver system with energy storage function |
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| CN103401224A (en) * | 2013-08-27 | 2013-11-20 | 武汉大学苏州研究院 | Multi-lithium-battery protection system |
| CN103532389A (en) * | 2013-10-21 | 2014-01-22 | 江苏雷奥生物科技有限公司 | Alternating current-direct current dual-purpose portable medical equipment |
| CN103716964A (en) * | 2013-12-30 | 2014-04-09 | 常州矽能电子科技有限公司 | LED energy storage drive system with multiplex AC-DC converter |
| CN104022650A (en) * | 2014-05-09 | 2014-09-03 | 苏州汇川技术有限公司 | Flyback switching power supply with output short circuit protection function |
| CN109379811A (en) * | 2018-11-20 | 2019-02-22 | 深圳市崧盛电子股份有限公司 | A kind of LED drive circuit with output electric current self-adjusting ability |
| CN109963396A (en) * | 2018-07-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of switch detection circuit |
| CN113366920A (en) * | 2019-01-25 | 2021-09-07 | 昕诺飞控股有限公司 | Lighting driver and driving method |
| CN113472035A (en) * | 2021-06-22 | 2021-10-01 | 深圳拓邦股份有限公司 | Lithium battery work control method and system and electric equipment |
| CN114007317A (en) * | 2021-10-09 | 2022-02-01 | 浙江科技学院 | Peak-valley electricity energy storage lamp and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103401224A (en) * | 2013-08-27 | 2013-11-20 | 武汉大学苏州研究院 | Multi-lithium-battery protection system |
| CN103532389B (en) * | 2013-10-21 | 2017-02-01 | 江苏雷奥生物科技有限公司 | Alternating current-direct current dual-purpose portable medical equipment |
| CN103532389A (en) * | 2013-10-21 | 2014-01-22 | 江苏雷奥生物科技有限公司 | Alternating current-direct current dual-purpose portable medical equipment |
| CN103716964A (en) * | 2013-12-30 | 2014-04-09 | 常州矽能电子科技有限公司 | LED energy storage drive system with multiplex AC-DC converter |
| CN103716964B (en) * | 2013-12-30 | 2015-12-16 | 常州矽能电子科技有限公司 | There is the LED energy storage drive system of multiplex AC-DC converter |
| CN104022650B (en) * | 2014-05-09 | 2017-05-03 | 苏州汇川技术有限公司 | Flyback switching power supply with output short circuit protection function |
| CN104022650A (en) * | 2014-05-09 | 2014-09-03 | 苏州汇川技术有限公司 | Flyback switching power supply with output short circuit protection function |
| CN109963396A (en) * | 2018-07-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of switch detection circuit |
| CN109379811A (en) * | 2018-11-20 | 2019-02-22 | 深圳市崧盛电子股份有限公司 | A kind of LED drive circuit with output electric current self-adjusting ability |
| CN109379811B (en) * | 2018-11-20 | 2020-11-03 | 深圳市崧盛电子股份有限公司 | LED drive circuit with output current self-adjusting capability |
| CN113366920A (en) * | 2019-01-25 | 2021-09-07 | 昕诺飞控股有限公司 | Lighting driver and driving method |
| CN113366920B (en) * | 2019-01-25 | 2024-06-11 | 昕诺飞控股有限公司 | Lighting driver and driving method |
| CN113472035A (en) * | 2021-06-22 | 2021-10-01 | 深圳拓邦股份有限公司 | Lithium battery work control method and system and electric equipment |
| CN114007317A (en) * | 2021-10-09 | 2022-02-01 | 浙江科技学院 | Peak-valley electricity energy storage lamp and control method thereof |
| CN114243820A (en) * | 2021-12-06 | 2022-03-25 | 上海电气国轩新能源科技有限公司 | Uninterruptible power supply circuit and power supply method thereof |
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