CN203851350U - LED driving circuit and output current ripple controller thereof - Google Patents
LED driving circuit and output current ripple controller thereof Download PDFInfo
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- CN203851350U CN203851350U CN201420280838.6U CN201420280838U CN203851350U CN 203851350 U CN203851350 U CN 203851350U CN 201420280838 U CN201420280838 U CN 201420280838U CN 203851350 U CN203851350 U CN 203851350U
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Abstract
The utility model provides an LED driving circuit and an output current ripple controller thereof. The controller comprises a linear constant-current control circuit and a constant-voltage control circuit. The linear constant-current control circuit is connected in series between the output end of a power switch and an LED load and supplies current to the LED load, wherein the current is provided with a preset current value. The first input end of the constant-voltage control circuit receives first reference voltage. The second input end of the constant-voltage control circuit is connected with the output end of the power switch in order to receive output ripple voltage. The constant-voltage control circuit compares the output ripple voltage with the output ripple voltage and generates a driving signal according to a compared result. The driving signal is used for controlling the on-off state of the power switch in order that the average value of the output ripple voltage is equal to the first reference voltage. The LED driving circuit and an output current ripple controller thereof make current flowing through the LED load constant and eliminate power-frequency ripples.
Description
Technical field
The utility model relates to LED Driving technique, relates in particular to a kind of LED drive circuit and output current ripple controller thereof.
Background technology
With reference to figure 1, the LED drive circuit of traditional buck configuration with power factor adjustment comprises: rectification circuit 110, input filter capacitor C1, constant-current control circuit 100, loop compensation circuit 104, power switch M1, output current sampling resistor Rsen1, sustained diode 5, load filter capacitor C4, LED load 105 and inductance L 1.Wherein, when power switch M1 conducting, input current is flowed out by the anode of rectification circuit 110, and parallel circuits, inductance L 1 that the power switch M1 that flows through successively, output current sampling resistor Rsen1, LED load 105 and load filter capacitor C4 form flow back into the negative terminal of rectification circuit 110; When power switch M1 turn-offs, input current is zero, and the electric current in inductance L 1 can not suddenly change, and the electric current of inductance L 1 parallel circuits that sustained diode 5, output current sampling resistor Rsen1, LED load 105 and load filter capacitor C4 form of flowing through flows back to inductance L 1.
Visible, the average current that flows through LED load 105 is identical with the average current of the output current sampling resistor Rsen1 that flows through, therefore, only needs the current average of controlling the output current sampling resistor Rsen1 that flows through just can control output current.When the tie point using power switch M1 and output current sampling resistor Rsen1 is during as the reference ground of constant-current control circuit 100, the magnitude of voltage of the other end of output current sampling resistor Rsen1 is negative value ,-Vsena.Constant-current control circuit 100 can comprise polarity transformation circuits 106, error amplifier 101, loop compensation circuit 104, pwm control circuit 102 and drive circuit 103.Wherein, polarity transformation circuits 106 converts the sampled voltage-Vsena of negative polarity to positive voltage Vsenb, and this positive voltage Vsenb is input to an input of error amplifier 101; Another input of error amplifier 101 receives reference voltage V REF1, and the output of error amplifier 101 connects loop compensation circuit 104, and the output of error amplifier 101 produces error voltage; Loop compensation circuit 104, conventionally by the series connection of resistance or resistance and electric capacity and/or compose in parallel, regulates pwm signal according to the output voltage V comp of error amplifier 101, and output voltage V comp is exactly the error voltage after loop compensation; Pwm control circuit 102 produces pwm signal according to the size of error voltage Vcomp, in the system that has power factor to adjust, error voltage Vcomp is for the ON time of power ratio control switch M1, in fixing ON time control circuit, the ON time of the power switch M1 that identical error voltage Vcomp controls is identical; Drive circuit 103 receives the pwm signal that pwm control circuit 102 exports and drives signal GT to produce, and this driving signal GT is for driving power switch M1.
Because constant-current controller 100 is used to realize the function of adjusting with power factor, constant-current controller 100 is controlled the constant current output electric current producing and is generally contained power frequency alternating component frequently, and load filter capacitor C4 can filtering radio-frequency component and a part of industrial frequency AC composition.For the mains frequency of conventional 50Hz, the electric current that outputs to LED load 105 contains 100Hz power frequency composition, will produce like this stroboscopic of 100Hz.This stroboscopic can affect the life-span of LED load 105, and causes user's visual fatigue, easily causes myopia.
Therefore the working frequency ripple wave, how reducing in LED load is urgent problem.
Utility model content
Problem to be solved in the utility model is to provide a kind of LED drive circuit and output current ripple controller thereof, and the electric current of the LED load that makes to flow through remains unchanged, and has eliminated working frequency ripple wave.
For solving the problems of the technologies described above, the utility model provides a kind of output current ripple controller of LED drive circuit, and this LED drive circuit at least comprises power switch and LED load,, described output current ripple controller comprises:
Linearity constant current control circuit, is connected between the output and described LED load of described power switch, and described linearity constant current control circuit provides electric current to described LED load, and this electric current has default current value;
Constant-voltage control circuit, its first input end receives the first reference voltage, its second input connects the output of described power switch to receive output ripple voltage, described constant-voltage control circuit is to described output ripple voltage and the first reference voltage compares and produce driving signal according to comparative result, this driving signal is for controlling the turn-on and turn-off of described power switch, so that the mean value of described output ripple voltage equates with described the first reference voltage.
According to an embodiment of the present utility model, the reference ground of described linearity constant current control circuit and constant-voltage control circuit is identical, and this is connected to being connected in series a little of described linearity constant current control circuit and described LED load with reference to ground.
According to an embodiment of the present utility model, described constant-voltage control circuit comprises:
Error amplifier, its first input end receives described the first reference voltage, and its second input receives described output ripple voltage, and its output produces error voltage;
Compensating circuit, is connected with the output of described error amplifier, and described compensating circuit carries out integration with controlled voltage to described error voltage;
Pwm control circuit, receives described control voltage, and described pwm control circuit produces pwm control signal according to described control voltage, and described pwm control signal includes the information of fixing ON time, and this fixing ON time is by described control voltage control;
Drive circuit, receives described pwm signal, and described drive circuit produces described driving signal according to this pwm signal.
According to an embodiment of the present utility model, described error amplifier is mutual conductance error amplifier.
According to an embodiment of the present utility model, described compensating network is made up of electric capacity, or is made up of electric capacity and resistance.
According to an embodiment of the present utility model, described linearity constant current control circuit is voltage control electric current structure.
According to an embodiment of the present utility model, described linearity constant current control circuit comprises:
Operational amplifier, its first input end receives the second reference voltage;
Switching tube, its grid connects the output of described operational amplifier, and its drain electrode connects the output of described power switch, and its source electrode connects the second input of described operational amplifier;
Pull down resistor, its first end connects the source electrode of described switching tube, and its second end connects described LED load.
For solving the problems of the technologies described above, the utility model also provides a kind of LED drive circuit, comprising:
Output current ripple controller described in above-mentioned any one;
Power switch, its input connects input signal anode, and its control end connects described constant-voltage control circuit to receive described driving signal, and its output connects described linearity constant current control circuit;
Load capacitance, its first end connects the output of described power switch;
Inductance, its first end connects the second end of described load capacitance, and its second end connects input signal negative terminal;
Fly-wheel diode, the second end of inductance described in its anodic bonding, its negative electrode connects the output of described power switch;
Wherein, described linearity constant current control circuit is in parallel with described load capacitance again after being configured to connect with LED load.
According to an embodiment of the present utility model, this LED drive circuit also comprises: rectification circuit, AC signal is carried out to rectification, and the output port of this rectification circuit connects described input signal anode and input signal negative terminal.
According to an embodiment of the present utility model, this LED drive circuit also comprises: input filter capacitor, and its first end connects described input signal anode, and its second end connects described input signal negative terminal.
Compared with prior art, the utlity model has following advantage:
In the LED drive circuit of the utility model embodiment, linearity constant current control circuit is connected with LED load, this linearity constant current control circuit provides electric current to LED load, this electric current has default current value, namely current value is changeless after setting, thereby the electric current that ensures to output in LED load does not contain working frequency ripple wave.
In addition, constant-voltage control circuit detects also the turning on and off of power ratio control switch of ripple voltage size in linear constant current circuit, after loop control, make ripple voltage on linearity constant current control circuit in other words the mean value of the ripple voltage of power switch output remain unchanged.
Brief description of the drawings
Fig. 1 is the electrical block diagram of a kind of LED drive circuit of buck configuration in prior art;
Fig. 2 is the electrical block diagram of the LED drive circuit of the utility model embodiment;
Fig. 3 is the detailed circuit structural representation of the linearity constant current control circuit in the LED drive circuit of the utility model embodiment;
Fig. 4 is the detailed circuit structural representation of the constant-voltage control circuit in the LED drive circuit of the utility model embodiment.
Embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail, but should not limit protection range of the present utility model with this.
With reference to figure 2, the LED drive circuit of the present embodiment comprises: output current ripple controller 200, power switch M1, load capacitance C4, LED load 105, inductance L 1 and sustained diode 5.In addition, this LED drive circuit can also comprise rectification circuit 110 and input filter capacitor C1.
Wherein, output current ripple controller 200 comprises constant-voltage control circuit 201 and linearity constant current control circuit 202.Furthermore, constant-voltage control circuit 201 is connected between the output and LED load 205 of power switch M1, and linearity constant current control circuit 202 provides electric current to LED load 305, and this electric current has default current value.The first input end of constant-voltage control circuit 201 receives the first reference voltage V REF2, the second input of constant-voltage control circuit 201 connects the output of power switch M1 to receive output ripple voltage Vsen2, constant-voltage control circuit 201 compares output ripple voltage Vsen2 and the first reference voltage V REF2, and produce and drive signal GT according to comparative result, this driving signal GT is for the turn-on and turn-off of power ratio control switch M1, so that the mean value of output ripple voltage Vsen2 equates with the first reference voltage V REF2.
Preferably, the reference ground of constant-voltage control circuit 201 and linearity constant current control circuit 202 is identical, and this is connected to being connected in series a little of linearity constant current control circuit 202 and LED load 205 with reference to ground.
Power switch M1 is connected between input signal anode and the input of linearity constant current control circuit 202.Furthermore, the input of power switch M1 connects input signal anode, and the control end of power switch M1 connects constant-voltage control circuit 201 and drives signal GT to receive, and the output of power switch M1 connects the input of linearity constant current control circuit 202.This power switch M1 can be for example MOS power switch pipe, or other suitable switching devices.
LED load 205 is connected with linearity constant current control circuit 202, more specifically, and the output of the anodic bonding linearity constant current control circuit 202 of LED load 205.
The first end of load capacitance C4 connects the output of power switch M1, and the second end of load capacitance C4 is connected with the negative electrode of LED load 205.In other words, linearity constant current control circuit 202 is connected with LED load 205, in parallel with load capacitance C4 more afterwards.
The first end of inductance L connects the second end of load capacitance and the negative electrode of LED load 205, and the second end of inductance L connects input signal negative terminal.
The second end of the anodic bonding inductance of sustained diode 5 and signal input negative terminal, the negative electrode of sustained diode 5 connects the output of power switch M1.
Rectification circuit 110 carries out rectification to AC signal Vac, and its output port connects above-mentioned input signal anode and input signal negative terminal.The first end of input filter capacitor C1 connects this input signal anode, and the second end of input filter capacitor C1 connects this input signal negative terminal.
This linearity constant current control circuit 202 can be for example voltage control electric current structure, namely controls by the second reference voltage V REF3 of input the electric current that exports LED load 205 to.
With reference to figure 3, Fig. 3 shows a kind of physical circuit of linearity constant current control circuit, comprising: operational amplifier 301, and its first input end receives the second reference voltage V REF3; Switching tube M2, the output of its grid concatenation operation amplifier 301, its drain electrode connects the output of power switch M2 (with reference to figure 2), the second input of its source electrode concatenation operation amplifier 301; Pull down resistor Rcs, the source electrode of its first end connecting valve pipe M2, its second end connects LED load 205 (with reference to figure 2), and in addition, the second end of pull down resistor Rcs is also as reference ground, and namely the second end of pull down resistor Rcs is equivalent to ground connection.
For the linearity constant current control circuit shown in Fig. 3, after the second reference voltage V REF3 sets, its current value that exports the electric current of LED load to will remain unchanged, and this current value is VREF3/Rcs, wherein VREF3 is the magnitude of voltage of the second reference voltage V REF3, and Rcs is the resistance value of pull down resistor Rcs.
With reference to figure 4, Fig. 4 shows a kind of concrete structure of constant-voltage control circuit, comprising: error amplifier 401, pwm control circuit 402, drive circuit 403 and compensating circuit 404.
Furthermore, the first input end of error amplifier 401 receives the first reference voltage V REF2, its second input is connected to the output of power switch M2 (referring to Fig. 2) to receive output ripple voltage Vsen2, error amplifier 401 compares the first reference voltage V REF2 and output ripple voltage Vsen2, calculate the then error voltage between, this error voltage is via the output output of error amplifier 401.This error amplifier 401 can be for example transconductance type error amplifier, or the error amplifier of other suitable types.
The error voltage that compensating circuit 404 is exported error amplifier 401 carries out integration with controlled voltage Vcomp2.This compensating circuit 404 can be made up of electric capacity, or also can and/or compose in parallel by resistance and the series connection of electric capacity process.For example, in the example shown in Fig. 4, compensating circuit 404 comprises: capacitor C 2, and its first end connects the output of error amplifier 401, its second end ground connection; Resistance R 1 its first end connects the first end of capacitor C 2; Capacitor C 3, the second end of its first end contact resistance R1, its second end connects the second end of capacitor C 2.
Pwm control circuit 402 receives controls voltage Vcom2, produces pwm control signal according to this control voltage Vcomp2.This pwm control circuit 402 includes the information of fixing ON time, this fixing ON time is controlled by controlling voltage Vcomp2, for example can be directly proportional with the magnitude of voltage of controlling voltage Vcomp2, the fixing ON time of the power switch M1 that identical error voltage Vcomp2 controls is identical.
Drive circuit 403 receives the pwm signal that this pwm control circuit 402 is exported, and produces and drives signal GT according to this pwm signal, and this driving signal GT is used for the turn-on and turn-off of the power switch of controlling LED drive circuit.
The turn-on and turn-off of above-mentioned constant-voltage control circuit power ratio control switch, make input current follow input voltage and change, and namely this constant-voltage control circuit " Proterozoic " is accompanied with power factor and adjusts function.
In conjunction with Fig. 2 and Fig. 4, error amplifier 401 compares the first reference voltage V REF2 and output ripple voltage Vsen2, after loop control, the average voltage of output ripple voltage Vsne2 is equated with the first reference voltage V REF2.Therefore, can, by the size of the magnitude of voltage of adjusting the first reference voltage V REF2, carry out the size of regulation output ripple voltage Vsen2.
Below the course of work of this LED drive circuit is simply described below: when power switch M1 conducting, input current transfers to input signal anode via the anode of rectification circuit 110, flow through successively after power switch M1, linearity constant current control circuit 202 and LED load 205 series connection circuit and the inductance L 1 of formation in parallel with load capacitance C4 again, flow back into the negative terminal of rectification circuit 110; When power switch M1 turn-offs, input current is zero, because the electric current in inductance L 1 can not suddenly change, therefore, electric current in inductance L 1 circuit of formation in parallel with load capacitance C4 again of flowing through after sustained diode 5, linearity constant current control circuit 202 and LED load 205 series connection, flow back into inductance L 1, form continuous current circuit.Visible, the electric current of the LED load 205 of flowing through is basic identical with the electric current of the linearity constant current control circuit 202 of flowing through, if the electric current of the linearity constant current control circuit 202 of flowing through is constant, the electric current of the LED load 205 of flowing through is also constant.Because linearity constant current control circuit 202 can be realized the constant current output of being controlled by the second reference voltage V REF3, therefore, the electric current of the LED load 205 of flowing through does not change, and does not wherein contain working frequency ripple wave electric current.
In fact, the elimination of working frequency ripple wave is by load capacitance C4 and the common realization of linearity constant current control circuit 202.When the electric current of the inductance L 1 of flowing through and the electric current of linearity constant current control circuit 202 are when unequal, the part of electric current difference will be provided by load capacitance C4 completely, thereby produces ripple voltage on load capacitance C4.Because the voltage at LED load 205 two ends is fixed, therefore this ripple voltage is applied on linearity constant current control circuit 202 completely, is also between the source leakage of the power tube M2 in Fig. 3.
In addition, the present embodiment also provides a kind of LED driving method, comprises the steps:
Step 1, linearity constant current control circuit is connected between the output and LED load of power switch, and by parallel with load capacitance to linearity constant current control circuit and LED load after series connection, described linearity constant current control circuit provides electric current to described LED load, this electric current has default current value;
Step 2, adopt constant-voltage control circuit to detect the output ripple voltage of the output of described power switch, this output ripple voltage and the first reference voltage are compared, and produce and drive signal according to comparative result, this driving signal is for controlling the turn-on and turn-off of described power switch, so that the mean value of described output ripple voltage equates with described the first reference voltage;
Step 3, the input current of the input of power switch is followed input voltage and is changed described in described constant-voltage control circuit control, to realize power factor corrective action, described output ripple voltage is absorbed completely by described load capacitance.
Furthermore, in step 1, the current value that linearity constant current control circuit provides is changeless after setting, and the electric current of the LED load that ensured to flow through is containing working frequency ripple wave.
In step 2, constant-voltage control circuit and linearity constant current control circuit can have identical reference ground, and this can be connected to the tie point of linearity constant current control circuit and LED load with reference to ground.
In step 3, constant-voltage control circuit is realized power factor corrective action, and the output ripple voltage of generation is carried by load capacitance completely, converts the ripple voltage dropping on linearity constant current control circuit to.
By above-mentioned driving method, the electric current that linearity constant current control circuit offers LED load remains unchanged, there is no working frequency ripple wave component, constant-voltage control circuit control inputs current following input voltage changes simultaneously, realize higher power factor, working frequency ripple wave electric current flows into load capacitance completely, transforms the ripple voltage obtaining drop to completely on linearity constant current control circuit by working frequency ripple wave electric current.
To sum up, the utility model discloses LED drive circuit and the LED driving method of the low output current ripple of adjusting with power factor, use linearity constant current control circuit be connected in series with LED load to make the to flow through current value of LED load to immobilize, thereby eliminate working frequency ripple wave completely, and carry out the size of control inputs electric current by controlling the size of mean value of output ripple voltage, realize power factor simultaneously and adjusted function; The ripple of input current all flow in load capacitance, converts the ripple voltage dropping on linearity constant current control circuit to, has realized the control of input power.
The above, be only preferred embodiment of the present utility model, not the utility model done to any pro forma restriction.Therefore, every content that does not depart from technical solutions of the utility model, just according to technical spirit of the present utility model to any simple amendment made for any of the above embodiments, the conversion that is equal to, all still belong in the protection range of technical solutions of the utility model.
Claims (10)
1. an output current ripple controller for LED drive circuit, this LED drive circuit at least comprises power switch and LED load, it is characterized in that, described output current ripple controller comprises:
Linearity constant current control circuit, is connected between the output and described LED load of described power switch, and described linearity constant current control circuit provides electric current to described LED load, and this electric current has default current value;
Constant-voltage control circuit, its first input end receives the first reference voltage, its second input connects the output of described power switch to receive output ripple voltage, described constant-voltage control circuit is to described output ripple voltage and the first reference voltage compares and produce driving signal according to comparative result, this driving signal is for controlling the turn-on and turn-off of described power switch, so that the mean value of described output ripple voltage equates with described the first reference voltage.
2. output current ripple controller according to claim 1, is characterized in that, the reference ground of described linearity constant current control circuit and constant-voltage control circuit is identical, and this is connected to being connected in series a little of described linearity constant current control circuit and described LED load with reference to ground.
3. output current ripple controller according to claim 1, is characterized in that, described constant-voltage control circuit comprises:
Error amplifier, its first input end receives described the first reference voltage, and its second input receives described output ripple voltage, and its output produces error voltage;
Compensating circuit, is connected with the output of described error amplifier, and described compensating circuit carries out integration with controlled voltage to described error voltage;
Pwm control circuit, receives described control voltage, and described pwm control circuit produces pwm control signal according to described control voltage, and described pwm control signal includes the information of fixing ON time, and this fixing ON time is by described control voltage control;
Drive circuit, receives described pwm signal, and described drive circuit produces described driving signal according to this pwm signal.
4. output current ripple controller according to claim 3, is characterized in that, described error amplifier is mutual conductance error amplifier.
5. output current ripple controller according to claim 3, is characterized in that, described compensating network is made up of electric capacity, or is made up of electric capacity and resistance.
6. output current ripple controller according to claim 1, is characterized in that, described linearity constant current control circuit is voltage control electric current structure.
7. output current ripple controller according to claim 6, is characterized in that, described linearity constant current control circuit comprises:
Operational amplifier, its first input end receives the second reference voltage;
Switching tube, its grid connects the output of described operational amplifier, and its drain electrode connects the output of described power switch, and its source electrode connects the second input of described operational amplifier;
Pull down resistor, its first end connects the source electrode of described switching tube, and its second end connects described LED load.
8. a LED drive circuit, is characterized in that, comprising:
Output current ripple controller in claim 1 to 7 described in any one;
Power switch, its input connects input signal anode, and its control end connects described constant-voltage control circuit to receive described driving signal, and its output connects described linearity constant current control circuit;
Load capacitance, its first end connects the output of described power switch;
Inductance, its first end connects the second end of described load capacitance, and its second end connects input signal negative terminal;
Fly-wheel diode, the second end of inductance described in its anodic bonding, its negative electrode connects the output of described power switch;
Wherein, described linearity constant current control circuit is in parallel with described load capacitance again after being configured to connect with LED load.
9. LED drive circuit according to claim 8, is characterized in that, also comprises:
Rectification circuit, carries out rectification to AC signal, and the output port of this rectification circuit connects described input signal anode and input signal negative terminal.
10. LED drive circuit according to claim 9, is characterized in that, also comprises:
Input filter capacitor, its first end connects described input signal anode, and its second end connects described input signal negative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420280838.6U CN203851350U (en) | 2014-05-28 | 2014-05-28 | LED driving circuit and output current ripple controller thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420280838.6U CN203851350U (en) | 2014-05-28 | 2014-05-28 | LED driving circuit and output current ripple controller thereof |
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| Publication Number | Publication Date |
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| CN203851350U true CN203851350U (en) | 2014-09-24 |
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| CN201420280838.6U Withdrawn - After Issue CN203851350U (en) | 2014-05-28 | 2014-05-28 | LED driving circuit and output current ripple controller thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103987178A (en) * | 2014-05-28 | 2014-08-13 | 杭州士兰微电子股份有限公司 | LED driving method and circuit and output current ripple controller of LED driving circuit |
| CN109788606A (en) * | 2018-12-28 | 2019-05-21 | 杰华特微电子（杭州）有限公司 | Ripple eliminates circuit and method and LED circuit |
| CN110177413A (en) * | 2019-06-27 | 2019-08-27 | 无锡格兰德微电子科技有限公司 | A kind of current ripples control device of constant-current source |
| CN112770445A (en) * | 2021-01-29 | 2021-05-07 | 漳州立达信光电子科技有限公司 | Full-period constant-power load driving system |
| CN113315089A (en) * | 2021-05-27 | 2021-08-27 | 晶艺半导体有限公司 | High power supply rejection ratio load switch circuit and control method thereof |
-
2014
- 2014-05-28 CN CN201420280838.6U patent/CN203851350U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103987178A (en) * | 2014-05-28 | 2014-08-13 | 杭州士兰微电子股份有限公司 | LED driving method and circuit and output current ripple controller of LED driving circuit |
| CN103987178B (en) * | 2014-05-28 | 2017-12-19 | 杭州士兰微电子股份有限公司 | LED driving methods, drive circuit and its output current ripple controller |
| CN109788606A (en) * | 2018-12-28 | 2019-05-21 | 杰华特微电子（杭州）有限公司 | Ripple eliminates circuit and method and LED circuit |
| CN110177413A (en) * | 2019-06-27 | 2019-08-27 | 无锡格兰德微电子科技有限公司 | A kind of current ripples control device of constant-current source |
| CN112770445A (en) * | 2021-01-29 | 2021-05-07 | 漳州立达信光电子科技有限公司 | Full-period constant-power load driving system |
| CN112770445B (en) * | 2021-01-29 | 2023-08-29 | 漳州立达信光电子科技有限公司 | Full-period constant-power load driving system |
| CN113315089A (en) * | 2021-05-27 | 2021-08-27 | 晶艺半导体有限公司 | High power supply rejection ratio load switch circuit and control method thereof |
| CN113315089B (en) * | 2021-05-27 | 2023-06-23 | 晶艺半导体有限公司 | High-power supply rejection ratio load switching circuit and control method thereof |
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Granted publication date: 20140924 Effective date of abandoning: 20171219 |
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