CN207491272U - A kind of Buck-boost LED drive circuits - Google Patents
A kind of Buck-boost LED drive circuits Download PDFInfo
- Publication number
- CN207491272U CN207491272U CN201721688046.2U CN201721688046U CN207491272U CN 207491272 U CN207491272 U CN 207491272U CN 201721688046 U CN201721688046 U CN 201721688046U CN 207491272 U CN207491272 U CN 207491272U
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- capacitance
- control module
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model is related to a kind of Buck boost LED drive circuits, applicable lighting circuit includes inductance L1, LED, capacitance and sustained diode 1；The driving circuit includes:High-voltage MOSFET pipe and JFET pipes, for the generation voltage module of the voltage needed for module work each in generation system, drive control module and Logic control module, sampling resistor RS, for calculating the CS of the equivalent current of LED in lighting circuit sampling computing modules, internal compensation module, the voltage ramp generator being modulated for the COMP voltages generated to internal compensating module and the zero passage detection module for detecting trough of the inductance in the mode of resonance after demagnetization, Logic control module is only when zero passage detection module detects trough signal, just open high-voltage MOSFET pipe.The utility model reduces power consumption, low harmony wave, improves PFC.
Description
Technical field
The utility model is related to field of LED drive technologies, and in particular to a kind of Buck-boost LED drive circuits.
Background technology
With the fast development of semiconductor technology, forth generation electric light source LED has obtained the popularization and use of large area.With biography
The electric light source of system is compared, and LED has many incomparable advantages, and such as long lifespan, efficient, low in energy consumption, brightness is high, small
The advantages that, therefore seem especially prominent in the application of lighting area.LED illumination System includes LED drive power and LED lamp two
Part, core are LED drive powers.Energy-efficient high-power LED driving power source becomes an important research side of industry
To.
High frequency, miniaturization are an important indicators of current Switching Power Supply design.It is opened firmly if driving power is operated in
Pass pattern, the raising of switching frequency can generate very big switching loss, reduce the transfer efficiency of system.It is intended that reduce
The soft switch technique of switching loss also becomes a research hotspot important in power electronics research field.
Controlled resonant converter is all common soft switch transducer including series, parallel, Series- Parallel Resonant Converter etc..It is humorous
The converter that shakes just can realize that the no-voltage of switching tube is open-minded by rationally designing in wider loading range, two pole of secondary rectification
The zero-current switching of pipe so as to reduce switching tube loss, improves efficiency.And AC-DC transformation is using Buck-Boost topologys, circuit
It is operated under discontinuous mode, it is automatic to realize PFC functions, it is that a single switch low order can rise and can drop converter circuit, realizes intermediate
DC bus-bar voltage, which can rise, to drop, and reduce the stress of rear class LLC switching tubes and capacitance, the above-mentioned background for the present invention.
Invention content
The technical problem to be solved in the present invention is to provide one kind can drop low-loss Buck-boost LED drive circuits.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of Buck-boost LED drivings electricity
Road, applicable lighting circuit include inductance L1, LED, capacitance and sustained diode 1；The driving circuit includes:
High-voltage MOSFET pipe and JFET pipes, the drain electrode connection DC power supply of JFTE pipes and the drain electrode of high-voltage MOSFET pipe；
Voltage module is generated, is connect with the grid and source electrode of JFET pipes, required for module work each in generation system
Voltage；
Drive control module and Logic control module, Logic control module control drive control module, drive control mould
Block is used to control the break-make of MOSFET tube grids；
Sampling resistor RS, one end connect the source electrode of MOSFET pipes, and the other end connects after capacitance CP generates voltage module production
Raw operating voltage, and the end is also connected with one end of inductance L1 in lighting circuit, the other end ground connection of inductance L1；
- CS samples computing module, the source electrode of MOSFET pipes is connected, for calculating the equivalent current of LED in lighting circuit；
Internal compensation module, connection CS sampling computing modules, and input terminal also accesses reference voltage, internal compensation module
A capacitance CM is also connected with, capacitance CM is also connected with sampling resistor RS；
Voltage ramp generator, the COMP voltages for being generated to internal compensating module are modulated, and generating has pulsewidth
Voltage signal, voltage signal connection Logic control module is used to control the keying of high-voltage MOSFET；
Zero passage detection module, it is humorous when detecting for detecting troughs of the inductance L1 in the mode of resonance after demagnetization
During vibration wave paddy, control signal is sent out to Logic control module, Logic control module only detects trough in zero passage detection module
During signal, high-voltage MOSFET pipe is just opened.
Further, the CS sampling modules include an operational amplifier, the anode access sampling electricity of operational amplifier
The anode-cathode voltage of RS is hindered, switch S1 is additionally provided in the anode of operational amplifier, switchs between S1 and the anode of operational amplifier
Node be also connected with a capacitance C1, capacitance C1 ground connection, it is electric that the output terminal of operational amplifier is provided with switch S2, switch S2 connection
R2, resistance R2 output signal OUT are hindered, the node between S2 and resistance R2 is switched and is also connected with a switch S3, switch S3 ground connection, electricity
The output terminal of resistance R2 is also connected with a capacitance C2, the ground terminal of capacitance C2 connection resistance switch S3.
Further, internal compensation module includes two operational amplifiers, and the anode of one of operational amplifier accesses
The output signal OUT of CS sampling modules, output terminal connect the grid of a metal-oxide-semiconductor, and the source electrode of the metal-oxide-semiconductor connects the operation amplifier
The cathode of device, and be grounded after source electrode access resistance R2, the source electrode of connection PMOS tube M2 is missed, and export COMP voltage signals；
The anode access reference voltage of another operational amplifier, output terminal connect the grid of a metal-oxide-semiconductor, and the source electrode of the metal-oxide-semiconductor connects
Enter the cathode of the operational amplifier, and be grounded after accessing resistance R1, the source electrode and grid of the drain electrode connection PMOS tube M1 of the metal-oxide-semiconductor
Pole, the drain electrode of PMOS tube M1 and PMOS tube M2 are connected and access voltage, and common gate connects.
From above-mentioned technical proposal it can be seen that the present invention has the following advantages：The trough of detection resonance can just open high pressure
MOSFET can thus reduce power consumption, improve efficiency；System self-powered is realized, without peripheral electric power system, simplifies periphery
Using reducing system cost.And low harmony wave, improve PFC.
Description of the drawings
Fig. 1 is the system principle diagram of the present invention；
The schematic diagram for the module that CS is sampled in Fig. 2 present invention；
Fig. 3 is the signal waveforms of a node in Fig. 2；
Fig. 4 is the principle schematic diagram of the internal compensation module of invention；
Fig. 5 is the oscillogram that the electric current of resistance RS and LED and the voltage of Fig. 2 interior joints C are flowed through in the present invention.
Fig. 6 is the schematic diagram that voltage module is generated in the present invention；
Fig. 7 is the schematic diagram of voltage ramp generator in the present invention.
Specific embodiment
It elaborates below in conjunction with attached drawing to the specific embodiment of the present invention.
As shown in Figure 1, the present invention Buck-boost LED drive circuits, applicable lighting circuit include inductance L1,
LED, capacitance and sustained diode 1, capacitance are arranged on the both ends of LED light group, and one end and the equal node of inductance of capacitance are another
Sustained diode 1 is set between end and inductance.
The driving circuit includes high-voltage MOSFET pipe, JFET pipes, generates voltage module, drive control module and patrol
Collect control module, sampling resistor RS, CS sampling computing module, internal compensation module, voltage ramp generator, zero passage detection mould
Block.
Wherein, the drain electrode of drain electrode the connection DC power supply, high-voltage MOSFET pipe of JFET pipes, which also has, generates voltage module, generates
Reference voltage of the voltage module needed for for generation system work, also has for the 5V voltages that chip uses to the work of system power supply
Voltage VCC, the operation principle of voltage generating module as shown in fig. 6, it include two divider resistance RCC1 and RCC2 and
Hysteresis comparator and logic control circuit, the cathode access reference voltage of sluggishness relatively, anode are then connected between RCC1 and RCC2
Node, the output terminal connection logic control circuit of hysteresis comparator, the output terminal of logic control circuit then connects metal-oxide-semiconductor M3's
Grid, the source electrode ground connection of metal-oxide-semiconductor M3, drain electrode then connect the grid of JFET pipes, and in the source that JFET pipes are reconnected into resistance RD excessively
Pole, JFET pipes reconnect output voltage after a diode, and the node of the cathode of diode is also connected with a capacitance, and capacitance is another
End ground connection, logic control circuit also access DRV drive signals.
In the case that VCC voltages are low, the branch pressure voltage of RCC1 and RCC2 are less than VREF1, then the gate voltage for controlling M3 is
Low, M3 is closed, and high pressure JFET is powered by diode to VCC.In the case of VCC voltage height, the partial pressure electricity of RCC1 and RCC2
Pressure is more than VREF1, then the voltage of M3 is high potential, and M3 is opened, and D point current potentials move ground to, due to the leakage of the elevated pressure JFET of RD
End is raised, until the VGS of high pressure JFET<VTH (VTH of high pressure JFET is -3V~-5V), turns it off, at this time the capacitance of VCC
To system power supply.DRV signal ensures that high pressure JFET powers only during demagnetization to VCC.So repeatedly.The voltage of VCC calculates
It is as follows：
VCC=(RCC1+RCC2)/RCC2*VREF1；
Drive control module and Logic control module, Logic control module control drive control module, drive control mould
Block is used to control the break-makes of MOSFET tube grids, Logic control module herein predominantly with door, when zero passage detection COMP signals
When being satisfied by condition, then open MOSFET pipes.
Sampling resistor RS, one end connect the source electrode of MOSFET pipes, and the other end connects after capacitance CP generates voltage module production
Raw operating voltage, and the end is also connected with one end of inductance L1 in lighting circuit, the other end ground connection of inductance L1；
CS sampling computing modules functional block diagram as indicated with 2, connects the source electrode of MOSFET pipes, for calculating in lighting circuit
The equivalent current of LED, including an operational amplifier, the anode of operational amplifier accesses the anode-cathode voltage of sampling resistor RS,
The anode of operational amplifier is additionally provided with switch S1, and the node switched between S1 and the anode of operational amplifier is also connected with an electricity
Hold C1, capacitance C1 ground connection, the output terminal of operational amplifier is provided with switch S2, switch S2 connections resistance R2, resistance R2 output letter
Number OUT switchs the node between S2 and resistance R2 and is also connected with a switch S3, switch S3 ground connection, and the output terminal of resistance R2 also connects
Connect a capacitance C2, the ground terminal of capacitance C2 connection resistance switch S3.
The operation principle that CS samplings calculate is as follows：When high-voltage MOSFET opens (normal shock state), CS sampled signals are from CS_IN
Into S1 switches are closed at this time, and A point current potentials follow CS_IN voltages slowly to rise, while A point voltages are transferred to B by amplifier
Point, S2 switches opening, S3 switch closures, C2 capacitances are discharged by resistance R2 at this time.When high-voltage MOSFET close (demagnetized state),
Then S1 switches are opened, and A points current potential can be maintained at the voltage before S1 is closed, that is, the crest voltage of CS_IN at this time, and S2 is opened at this time
It closes, S3 switches are opened, and B points and the same current potential of C point voltages filter to obtain signal OUT by R2 and C2,.It works from system former
It could be aware that in reason under normal shock state, the electric current of LED is provided by capacitance, when system is under demagnetized state, the electric current of LED
It is then to be provided by inductance, this CS sample-taking calculating circuit calculates for equivalent LED current.Specific oscillogram is as shown in Figure 3.
The functional block diagram of internal compensation module is as shown in figure 4, internal compensation module includes two operational amplifiers, wherein one
The output signal OUT of the anode access CS sampling modules of a operational amplifier, output terminal connect the grid of a metal-oxide-semiconductor, the MOS
The source electrode of pipe connects the cathode of the operational amplifier, and is grounded after source electrode access resistance R2, misses the source electrode of connection PMOS tube M2,
And output COMP voltage signals；The anode access reference voltage of another operational amplifier, output terminal connect the grid of a metal-oxide-semiconductor
Pole, the source electrode of the metal-oxide-semiconductor access the cathode of the operational amplifier, and be grounded after accessing resistance R1, the drain electrode connection of the metal-oxide-semiconductor
The source electrode and grid of PMOS tube M1, the drain electrode of PMOS tube M1 and PMOS tube M2 are connected and access voltage, and common gate connects.
" internal compensation " module operation principle is as follows：VREF is internal benchmark, and VCS_OUT is " CS samplings calculate " module
Output OUT signal.M1 and M2 is PMOS tube, and the ditch road width of M1 is W1, and the ditch road width of raceway groove a length of L1, M2 are W2, and raceway groove is long
The ratio of breadth length ratio for L2, M1 and M2 is W1/L1：W2/L2=1：1, resistance R1=R2.Amplifier is understood by the principle of amplifier
Anode and negative terminal voltage are equal, it is known that the electric current for flowing through resistance R1 and M1 is I1=VREF/R1, the electric current for flowing through R2 is I2
The breadth length ratio of=(VCS_OUT)/R2, M1 and M2 is equal, then the electric current for flowing through M2 is IM2=I1, and COMP ports are plug-in one big
In the capacitance of 1uF, for this capacitance for reducing the system bandwidth of " internal compensation " module, this bandwidth is less than the bandwidth of VCS_OUT
5 to 10 times.When the virtual value of VCS_OUT is less than VREF, then the average current of I2 is less than I1, the increase of COMP voltages.Work as COMP
Voltage increases, then the pulsewidth of PWM can also increase therewith, then the turn-on time increase of high-voltage MOSFET, VCS detect the peak value of voltage
It will increase, the virtual value of the VCS_OUT of response will increase, and the electric current on such R2 will slowly increase, when the electric current of R2
Average value increase to as I1, then reach balance.The virtual value of VCS_OUT and VREF are equal at this time.
So Current calculation of LED is as follows：As shown in figure 5, IRCS is the electric current for flowing through resistance RS, in time T1, high pressure
MOSFET has electric current on resistance RS in the case of opening, due to the effect of inductance, the linear increase of electric current, at this time inductance fill
Electricity, LED no currents.In time T2, high-voltage MOSFET is closed, and inductance demagnetization, then inductive discharge, electric current flow through LED, it is desirable that
The electric current of ILED is it is necessary to ILED current integrations.VC voltages and ILED as shown in Figure 5 are proportionate relationships, as long as so being done to VC
Integral Processing can then obtain the size of ILED.Shown in Fig. 2, we carry out RC Integral Processings to C point voltages VC, then can obtain
To the average value of VC voltages.Since VC is the crest voltage of the RCS detected, so obtained integral voltage is 2 times of ILED,
So the Current calculation of LED is as follows：
ILED=VREF/ (2*RS)
Voltage ramp generator, the COMP voltages for being generated to internal compensating module are modulated, and generating has pulsewidth
Voltage signal, voltage signal connection Logic control module is used to control the keying of high-voltage MOSFET.Its operation principle such as Fig. 7
Shown, by the principle of amplifier it is found that this amplifier is a voltage follower, in the case where system is demagnetized, SW1 switches are opened,
E point current potentials are identical with the input voltage of amplifier at this time, and all for 1.5V, (this voltage could be provided as free voltage, this chip is
1.5V), it demagnetizes and completes when system, into normal shock state, then SW1 is closed, and IS starts to charge up the capacitance of E points, and voltage is from 1.5V
Start slowly toward rising, when voltage reaches COMP mouthfuls of voltage, then normal shock terminates, and system enters demagnetization pattern, and SW1 is opened, E points
Current potential becomes 1.5V, so repeatedly.COMP voltages are a stable voltage, so E point voltages rise to COMP voltages every time
Time be identical, material is thus formed fixed turn-on time because busbar voltage is the half-wave of 100HZ, the peak of inductance
It is as follows to be worth Current calculation：
IP=VL/L*T_ON
VL is busbar voltage, and when T_ON is fixed value, then IP follows busbar to change.The same-phase of VL and IP are realized, it is real
The function of PFC is showed.
Zero passage detection module, it is humorous when detecting for detecting troughs of the inductance L1 in the mode of resonance after demagnetization
During vibration wave paddy, control signal is sent out to Logic control module, Logic control module only detects trough in zero passage detection module
During signal, high-voltage MOSFET pipe is just opened.
System Working Principle is as follows：Work as system starts, busbar voltage rises therewith, and DN port voltages start to increase,
(dotted line frame) is managed by the JFET in the high-voltage MOSFET of customization, generating chip power voltage VCC, VCC voltage representative value is
7.6V.When VCC voltages reach the upper voltage of UVLO, then system starts, COMP voltages are pre-charged to 1.5V at this time, and open
Beginning slowly rises, and according to COMP voltages, system can generate a PWM pulse-width signal to drive MOSFET therewith, electric in this way
Stream will flow through sampling resistor RS, and sampled signal VRS, VRS signal is generated at RS resistance both ends and passes through internal " CS sampling meters
The virtual value for the electric current for flowing through LED is calculated in calculation " module.This voltage and internal benchmark (0.2V) compare to obtain COMP's
Voltage, then COMP voltages are again and " voltage ramp generator " adjusts pulsewidth, controlling the closing of high-voltage MOSFET.In order to drop
Low-power consumption, improves efficiency, and system employs " zero passage detection " module.In the time opened in high-voltage MOSFET, electric current is by adopting
Sample resistance RS, inductance L1 is linearly increasing to earth-current, and the electric current of LED is by being connected to obtained by the capacitance electric discharge at LED both ends.Work as high pressure
In the time that MOSFET is closed, inductance L1 is discharged by LED, sustained diode 1.Terminate when inductance demagnetizes then inductance just into
Enter mode of resonance, at this time " zero passage detection " module, high-voltage MOSFET can just be opened by detecting the trough of resonance, can thus be reduced
Power consumption improves efficiency.
Dual chip encapsulation may be used in the present invention, employs the MOSFET of customization, realizes system self-powered, and no periphery supplies
Electric system simplifies peripheral applications, reduces system cost.And low harmony wave, improve PFC.
Claims (3)
1. a kind of Buck-boost LED drive circuits, applicable lighting circuit includes inductance L1, LED, capacitance and afterflow two
Pole pipe D1；The driving circuit includes:
High-voltage MOSFET pipe and JFET pipes, the drain electrode connection DC power supply of JFTE pipes and the drain electrode of high-voltage MOSFET pipe；
Voltage module is generated, is connect with the grid and source electrode of JFET pipes, for the electricity needed for module work each in generation system
Pressure；
Drive control module and Logic control module, Logic control module control drive control module, drive control module are used
In the break-make of control MOSFET tube grids；
Sampling resistor RS, one end connect the source electrode of MOSFET pipes, and the other end connects after capacitance CP generates what voltage module generated
Operating voltage, and the end is also connected with one end of inductance L1 in lighting circuit, the other end ground connection of inductance L1；
- CS samples computing module, the source electrode of MOSFET pipes is connected, for calculating the equivalent current of LED in lighting circuit；
Internal compensation module, connection CS sampling computing modules, and input terminal also accesses reference voltage, internal compensation module also connects
A capacitance CM is met, capacitance CM is also connected with sampling resistor RS；
Voltage ramp generator, the COMP voltages for being generated to internal compensating module are modulated, and generate the electricity with pulsewidth
Signal is pressed, voltage signal connection Logic control module is used to control the keying of high-voltage MOSFET；
Zero passage detection module, for detecting troughs of the inductance L1 in the mode of resonance after demagnetization, when detecting resonance wave
Gu Shi sends out control signal to Logic control module, and Logic control module only detects trough signal in zero passage detection module
When, just open high-voltage MOSFET pipe.
2. Buck-boost LED drive circuits according to claim 1, it is characterised in that：The CS sampling modules include
One operational amplifier, the anode-cathode voltage of the anode access sampling resistor RS of operational amplifier, operational amplifier anode also
Switch S1 is provided with, the node between S1 and the anode of operational amplifier is switched and is also connected with a capacitance C1, capacitance C1 ground connection, fortune
The output terminal for calculating amplifier is provided with switch S2, switchs S2 connection resistance R2, resistance R2 output signal OUT, switchs S2 and resistance
Node between R2 is also connected with a switch S3, switch S3 ground connection, and the output terminal of resistance R2 is also connected with a capacitance C2, capacitance C2
Connect the ground terminal of resistance switch S3.
3. Buck-boost LED drive circuits according to claim 2, it is characterised in that：Internal compensation module includes two
A operational amplifier, the output signal OUT of the anode access CS sampling modules of one of operational amplifier, output terminal connection one
The grid of a metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor connect the cathode of the operational amplifier, and be grounded after source electrode access resistance R2, miss
The source electrode of PMOS tube M2 is connected, and exports COMP voltage signals；The anode access reference voltage of another operational amplifier, output
The grid of one metal-oxide-semiconductor of end connection, the source electrode of the metal-oxide-semiconductor access the cathode of the operational amplifier, and be grounded after accessing resistance R1,
The source electrode and grid of the drain electrode connection PMOS tube M1 of the metal-oxide-semiconductor, the drain electrode of PMOS tube M1 and PMOS tube M2 are connected and access electricity
Pressure, and common gate connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721688046.2U CN207491272U (en) | 2017-12-06 | 2017-12-06 | A kind of Buck-boost LED drive circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721688046.2U CN207491272U (en) | 2017-12-06 | 2017-12-06 | A kind of Buck-boost LED drive circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207491272U true CN207491272U (en) | 2018-06-12 |
Family
ID=62457771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721688046.2U Active CN207491272U (en) | 2017-12-06 | 2017-12-06 | A kind of Buck-boost LED drive circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207491272U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809830A (en) * | 2017-12-06 | 2018-03-16 | 无锡恒芯微科技有限公司 | A kind of Buck boost LED drive circuits |
-
2017
- 2017-12-06 CN CN201721688046.2U patent/CN207491272U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809830A (en) * | 2017-12-06 | 2018-03-16 | 无锡恒芯微科技有限公司 | A kind of Buck boost LED drive circuits |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107809830A (en) | A kind of Buck boost LED drive circuits | |
| CN101777770B (en) | Control circuit for voltage dropping type power factor corrector | |
| CN103716965B (en) | LED driving device and control circuit and output current detection circuit thereof | |
| CN101951716B (en) | Constant-on-time primary side constant-current control device for LED driver with high power factor | |
| CN101489336B (en) | Constant current source control circuit | |
| CN102694476B (en) | Switch control circuit applied to bridgeless exchange circuit and control method | |
| CN106160418A (en) | A kind of control method of Switching Power Supply | |
| CN103269164B (en) | The quasi-single-stage high power factor circuit of former limit current constant control and device | |
| CN202997938U (en) | A high power factor constant current drive circuit and a high power factor constant current device | |
| CN103973097A (en) | Active valley-filled alternating-current and direct-current converter for improving power factor efficiency | |
| CN104470158A (en) | Voltage-reduction structure LED driving circuit, and constant current driver and design method thereof | |
| CN107172767B (en) | A kind of LED control driving circuit | |
| CN110391736A (en) | The control circuit of BUCK converter | |
| CN205070828U (en) | AC -DC single -stage control chip and control system thereof | |
| CN109742964A (en) | Control circuit and method for AC/DC converter with input power limitation | |
| CN103269162A (en) | Quasi-single-stage high power factor constant current circuit and device | |
| CN207491272U (en) | A kind of Buck-boost LED drive circuits | |
| CN108712070B (en) | Based on ZCS PWM bi-directional DC-DC CUK converter, transformation system and method | |
| CN106026623A (en) | Isolation type electronic switch | |
| CN203734885U (en) | LED driving device and control circuit and output current detection circuit thereof | |
| Yu et al. | Temperature-related MOSFET power loss modeling and optimization for DC-DC converter | |
| CN108054919A (en) | A kind of control method of dcdc converter | |
| CN102931830B (en) | The control circuit of induction charging time, method, chip and Switching Power Supply | |
| CN102123553A (en) | COT mode LED lighting driving circuit | |
| CN104734496A (en) | SEPIC feed buck-boost converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |