CN205622931U - Voltage control circuit and LED drive circuit - Google Patents
Voltage control circuit and LED drive circuit Download PDFInfo
- Publication number
- CN205622931U CN205622931U CN201620362983.8U CN201620362983U CN205622931U CN 205622931 U CN205622931 U CN 205622931U CN 201620362983 U CN201620362983 U CN 201620362983U CN 205622931 U CN205622931 U CN 205622931U
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- circuit
- voltage
- input
- control circuit
- electric ballast
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model provides a voltage control circuit and LED drive circuit, wherein, this voltage control circuit includes: electronic ballast detection circuitry, even rectifying circuit's input, the unidirectional flux device, the forward end is rectifying circuit even, and inverting terminal connects filter circuit, voltage detection circuit, it is parallelly connected with filter circuit to be located between unidirectional flux device and the LED driver, the switch to the antithetical couplet is at rectifier circuit's output, and control circuit, voltage detection circuit and electronic ballast detection circuitry, output linked switch are connected to its input. The utility model discloses compatible electric wire netting input is simultaneously inputed with electronic ballast, its greatly reduced LED drive circuit's manufacturing cost, improved circuit system's reliability moreover.
Description
Technical field
This utility model relates to electronic circuit technology field, drives electricity particularly to a kind of voltage control circuit and LED
Road.
Background technology
Traditional electric ballast is mainly used in fluorescent lamp, but fluorescent lamp not only luminous efficiency ratio is relatively low, and to ring
Certain pollution can be caused in border.By contrast, LED has luminous efficiency height, life-span length and environmentally safe
Etc. advantage, LED is replaced fluorescent lamp and is had become as a kind of irresistible trend.In order to reduce cost of labor, energy
Enough directly replacements, it is desirable to LED lamp is possible not only to be directly accessed civil power, simultaneously can also be directly as electronic ballast
The load of device.
It is known that electric ballast is output as the AC signal of high frequency, and LED needs direct current supply.For
Meet the LED demand as load, need by rectifier bridge rectification, the output of electric ballast is become direct current,
Recycling LED driver is converted into the unidirectional current needed for LED.
But, electric ballast is to design exclusively for fluorescent lamp, in the lighting stage, needs to produce high electrical breakdown fluorescent tube
To light fluorescent lamp, its output voltage is up to 800～about 1000V.So, if LED lamp is directly as electricity
The load of sub-ballast, in order to meet pressure requirement, the pressure selection of device all must be no at about 1000V
Then can cause device failure because of high pressure.Therefore, the demand brings to the exploitation of LED drive circuit greatly
Challenge, considerably increases the production cost of LED drive circuit.
Utility model content
For solving above-mentioned technical problem, the utility model proposes a kind of voltage control circuit and LED drive circuit, can
Input with the most compatible electrical network input and electric ballast.This utility model is by the voltage on control bus so that
The pressure of LED driver can select according to the requirement of alternating current input, greatly reduces LED drive circuit
Production cost, and improve the reliability of Circuits System.
A kind of voltage control circuit that this utility model provides, for entering the voltage on the bus in LED drive circuit
Row controls, and described LED drive circuit includes rectification circuit, filter circuit and LED driver in parallel successively, should
Voltage control circuit includes:
Electric ballast testing circuit, connects the input of described rectification circuit, to detect the input of described rectification circuit
Whether signal is from electric ballast；
One way conducting device, is connected on the bus between described rectification circuit and described filter circuit, and its forward end is even
Connecing described rectification circuit, end of oppisite phase connects described filter circuit；
Voltage detecting circuit, in parallel with described filter circuit, and it is positioned at described one way conducting device and described LED driving
Between device, whether to detect the voltage on described bus higher than preset voltage value；
Switch, is connected in parallel on the outfan of described rectification circuit；When described switch conduction, the output of described rectification circuit
Holding by described switch discharge, described filter circuit constitutes drive circuit with described LED driver；
And control circuit, its input connects described voltage detecting circuit and described electric ballast testing circuit, output
End connects described switch；Described control circuit in the input signal of described rectification circuit from described electric ballast and mother
When voltage on line is higher than described preset voltage value, control described switch conduction.
As a kind of embodiment, described one way conducting device is the first diode or triode.
As a kind of embodiment, described switch is transistor.
As a kind of embodiment, described electric ballast testing circuit is by detecting the input electricity of described rectification circuit
The rate of change of pressure judges that whether the input signal of described rectification circuit is from described electric ballast.
As a kind of embodiment, described electric ballast testing circuit include the first electric capacity, the second electric capacity, second
Diode, the 3rd diode and the first resistance；
Described first electric capacity, its one end connects the input of described rectification circuit, and the other end connects described second diode
Anode；
The negative electrode of described second diode passes through described second capacity earth；
Described 3rd diode, its plus earth, negative electrode is connected between described first electric capacity and described second diode；
Described first resistance, in parallel with described second electric capacity, one end ground connection, the other end is connected to described two or two pole
Outfan between pipe and described second electric capacity and as described electric ballast testing circuit connects with described control circuit
Connect.
As a kind of embodiment, described electric ballast testing circuit is by detecting the input electricity of described rectification circuit
The frequency of pressure judges that whether the input signal of described rectification circuit is from described electric ballast.
As a kind of embodiment, described electric ballast testing circuit includes the second resistance, the 3rd resistance and frequency
Rate testing circuit；
One end of described second resistance is as the input of described electric ballast testing circuit, with described rectification circuit
Input connects, and the other end passes through described 3rd resistance eutral grounding；
Described frequency detection circuit, its input is connected between described second resistance and the 3rd resistance, outfan conduct
The outfan of described electric ballast testing circuit is connected with described control circuit.
As a kind of embodiment, described voltage detecting circuit includes the 4th resistance and the 5th resistance being sequentially connected in series,
The outfan of described voltage detecting circuit is between described 4th resistance and the 5th resistance and connects described control circuit.
As a kind of embodiment, described switch is NMOS tube, PMOS or NPN pipe.
As a kind of embodiment, described control circuit includes the first comparator, the second comparator and logic circuit；
Described first comparator, its first input end connects the outfan of described voltage detecting circuit, and the second input is even
Connect the first reference voltage；
Described second comparator, its first input end connects the outfan of described electric ballast testing circuit, and second is defeated
Enter end and connect the second reference voltage；
Described logic circuit, its input connects described first comparator and the outfan of described second comparator, output
End connects described switch.
As a kind of embodiment, described first comparator is hysteresis loop comparator.
As a kind of embodiment, described logic circuit is additionally operable to the conducting after described switch conduction to described switch
Time carries out timing, and after the ON time of described switch reaches the setting time, described logic circuit controls described switch
Turn off.
Correspondingly, this utility model also provides for a kind of LED drive circuit, including rectification circuit in parallel successively, filtering
Circuit and LED driver, also include the voltage control circuit described in any of the above-described item.
As a kind of embodiment, described rectification circuit be single ended input bridge rectifier or double-width grinding bridge-type whole
Current circuit.
As a kind of embodiment, described filter circuit is electric capacity or π type filter circuit.
As a kind of embodiment, described LED driver is circuit of reversed excitation or Buck conversion circuit.
This utility model having the beneficial effects that compared to prior art:
The voltage control circuit that this utility model provides, connects one-way conduction device between rectification circuit and filter circuit
Part, at the outfan paralleling switch of rectification circuit, the input at rectification circuit access electric ballast testing circuit with
Whether the input signal of detection rectification circuit is from electric ballast；Access between rectification circuit and LED driver
Whether voltage detecting circuit is higher than preset voltage value with the voltage on detection bus；By electric ballast testing circuit and electricity
Control circuit is received in the output of pressure testing circuit, the outfan connecting valve of control circuit, when the input of rectification circuit is believed
Number from electric ballast, when the voltage on bus is higher than preset voltage value simultaneously, switched on-off mother by control
Within voltage on line is limited in preset voltage value.The LED drive circuit that this utility model provides includes this voltage control
Circuit processed.
Voltage control circuit of the present utility model and LED drive circuit, can the most compatible electrical network input and electronics town
Stream device input, it is by the voltage on control bus so that the pressure of LED driver can input according to alternating current
Requirement select, greatly reduce the production cost of LED drive circuit, and improve the reliable of Circuits System
Property.
Accompanying drawing explanation
The circuit connection diagram of one embodiment of the voltage control circuit that Fig. 1 provides for this utility model；
The circuit connection diagram of another embodiment of the voltage control circuit that Fig. 2 provides for this utility model；
The circuit connection diagram of the another embodiment of the voltage control circuit that Fig. 3 provides for this utility model；
The busbar voltage waveform of one embodiment of the voltage control circuit that Fig. 4 provides for this utility model and switch drive
Waveform diagram；
The structural representation of the rectification circuit in one embodiment of the LED drive circuit that Fig. 5 provides for this utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, to this utility model, above-mentioned and other technical characteristic and advantage are carried out clearly and completely
Describe, it is clear that described embodiment is only section Example of the present utility model rather than whole embodiment.
Referring to Fig. 1, this utility model embodiment one provides a kind of voltage control circuit, for driving LED
The voltage on bus in circuit is controlled.This LED drive circuit include successively in parallel rectification circuit 100,
Filter circuit 200 and LED driver 300, input signal inputs from the input of rectification circuit 100, through filter
LED is driven by LED driver 300 after wave circuit 200 filtering.Wherein, this voltage control circuit includes electronics town
Stream device testing circuit 400, one way conducting device (being diode D25 in diagram), voltage detecting circuit 500, switch
600 and control circuit 700.
Electric ballast testing circuit 400 connects the input of rectification circuit 100, to detect the defeated of rectification circuit 100
Whether enter signal from electric ballast.Diode D25 is connected between rectification circuit 100 and filter circuit 200
Bus on, its anode connect rectification circuit 100, negative electrode connect filter circuit 200.Voltage detecting circuit 500 with
Filter circuit 200 is in parallel, and between diode D25 and LED driver 300, to detect the electricity on bus
Whether pressure is higher than preset voltage value.Switch 600 is in parallel with rectification circuit 100, and one end is connected to rectification circuit 100
And on the bus between diode D25, other end ground connection.When switching 600 conducting, rectification circuit 100 defeated
Going out and hold ground connection, filter circuit 200 and LED driver 300 constitute drive circuit；The input of control circuit 700 is even
Connect voltage detecting circuit 500 and electric ballast testing circuit 400, outfan connecting valve 600, control circuit 700
Detect that at electric ballast testing circuit 400 input signal of rectification circuit 100 is examined from electric ballast and voltage
When slowdown monitoring circuit 500 detects the voltage on bus higher than preset voltage value, control switch 600 conducting, rectification circuit
The outfan of 100 constitutes drive circuit by switch 600 electric discharge, filter circuit 200 and LED driver 300, from
And within the voltage on bus is limited in preset voltage value.
It should be noted that the one way conducting device in the present embodiment, act primarily as from rectification circuit 100 to filter circuit
The effect of 200 one-way conductions so that when switching 600 turns on pull-down, is simply carried out the outfan of rectification circuit 100
It is drop-down, without filter circuit 200 is carried out drop-down.It can be realized by one or more diodes, structure letter
Single.Can also be realized by audion, i.e. use emitter junction (base stage and colelctor electrode short circuit), it is also possible to by it
His control circuit realizes this function, the most no longer redundant later.
Above-mentioned switch 600 can be transistor, such as NMOS tube, PMOS, CMOS tube, NPN pipe etc.,
All with NMOS tube M21 for exemplifying in diagram.
Above-described embodiment is mainly connection diode between rectification circuit 100 and filter circuit 200, and in rectification
The outfan of circuit 100 switch 600 in parallel, when the input signal of rectification circuit 100 is from electric ballast,
When voltage on bus is higher than preset voltage value simultaneously, by the break-make controlling switch 600, the voltage on bus is limited
Within preset voltage value.Specific as follows:
Input at rectification circuit 100 accesses electric ballast testing circuit 400, to detect rectification circuit 100
Whether input signal is from electric ballast；Voltage inspection is accessed between rectification circuit 100 and LED driver 300
Whether slowdown monitoring circuit 500, detect the voltage on bus higher than preset voltage value；Then by electric ballast testing circuit
400 and the output of voltage detecting circuit 500 receive control circuit 700；The outfan of last control circuit 700 connects
Switch 600, when control circuit 700 judges that input signal is higher than preset voltage value from electric ballast and busbar voltage,
Then controlling switch conduction, the output head grounding of rectification circuit 100, filter circuit 200 is constituted with LED driver 300
Drive circuit, makes LED driver 300 normally to work；Otherwise control switch 600 disconnection.
Utilize the voltage control circuit that the present embodiment provides, can the most compatible electrical network input and electric ballast input.
By the voltage on control bus so that the pressure of LED driver can select according to the requirement of electrical network input,
Greatly reduce the production cost of LED drive circuit, improve system reliability.
Further, owing to the output of electric ballast is square wave, its operating frequency major part is at 20kHz-120kHz
Left and right, and electrical network is sinusoidal wave, electric voltage frequency is 50Hz/60Hz, and the two differs greatly.Therefore, it can by inspection
Rate of change or the frequency of surveying the input voltage of rectification circuit judge electric ballast input or electrical network input.
As a kind of embodiment, can realize passing through by the electric ballast testing circuit of circuits below structure
The rate of change of the input voltage of detection rectification circuit judges that whether the input signal of rectification circuit is from electric ballast.
With continued reference to Fig. 1, electric ballast testing circuit 400 include electric capacity C21, electric capacity C22, diode D27,
Diode D26 and resistance R21.One end of electric capacity C21 connects the input of rectification circuit 100, and the other end is even
Connecing the anode of diode D27, the negative electrode of diode D27 passes through electric capacity C22 ground connection.The anode of diode D26 connects
Ground, negative electrode is connected between electric capacity C21 and diode D27.Resistance R21 is in parallel with electric capacity C22, and one terminates
Ground, the other end is connected between diode D27 and electric capacity C22, and as electric ballast testing circuit 400
Outfan is connected with control circuit 700.
When the voltage dv/dt on electric capacity C21 is timing (i.e. under charged state), electric current passes through diode D27 at electricity
Certain voltage is produced on resistance R21.When the voltage dv/dt on electric capacity C21 is for bearing (under discharge condition), electric current
It is input to rectification circuit by diode D26 from earth terminal.Electric capacity C22 plays pressure stabilization function, and resistance R21 is as electricity
After holding the load guarantee system closedown of C22, electric capacity C22 has discharge loop to discharge.When input voltage rate of change
Time bigger, the electric current on electric capacity C21 increases, and the voltage on resistance R21 raises, therefore can be by detection resistance
Voltage on R21 judges that input is electric ballast or electrical network.
As another kind of embodiment, can realize leading to by the electric ballast testing circuit of circuits below structure
Cross the frequency of input voltage of detection rectification circuit to judge that whether the input signal of rectification circuit is from electric ballast.
Seeing Fig. 2, electric ballast testing circuit 400 includes resistance R21, resistance R22 and frequency detection circuit
410.Resistance R21 and resistance R22 series connection, one end of resistance R21 is defeated as electric ballast testing circuit 400
Entering end, be connected with the input of rectification circuit 100, the other end passes through resistance R22 ground connection.Frequency detection circuit 410
Input be connected between resistance R21 and resistance R22, outfan is as electric ballast testing circuit 400
Outfan is connected with control circuit 700.When frequency detection circuit 410 detect the signal on bus be 20KHz or
During the high-frequency signal of person more than 20KHz, i.e. can determine whether that the input signal of rectification circuit 100 is from electric ballast.
It follows that see Fig. 1 to Fig. 3, after voltage detecting circuit 500 can be arranged on filter circuit 200 (as
Shown in Fig. 1), it is also possible to before being arranged on filter circuit (as shown in Figures 2 and 3).
Further, whether voltage detecting circuit 500 can detect the voltage on bus in the way of using electric resistance partial pressure
Higher than preset voltage value, as shown in Figure 1 to Figure 3, it includes resistance R23 and resistance R24, the voltage contacted successively
The outfan of testing circuit 500, between resistance R23 and resistance R24, connects control circuit 700.Resistance R23
Acting primarily as dividing potential drop effect, its resistance is typically larger than the resistance of resistance R24.
With continued reference to Fig. 1 to Fig. 3, as a kind of embodiment, control circuit 700 includes comparator U21, ratio
Relatively device U22 and logic circuit 710.Wherein, the first input end of comparator U21 connects voltage detecting circuit 500
Outfan, the second input connects the first reference voltage VREF1；The first input end of comparator U22 connects electricity
The outfan of sub-ballast testing circuit 400, the second input connects the second reference voltage VREF2；Logic circuit
The input of 710 connects outfan and the outfan of comparator U22 of comparator U21, logic circuit 710 defeated
Go out to hold connecting valve 600.When the outfan of voltage detecting circuit 500 is more than VREF1 and electric ballast detection electricity
The outfan on road 400 is more than VREF2, then logic circuit 710 controls switch 600 conducting.
Electric ballast input waveform (N end), busbar voltage waveform and switch M21 drive waveforms are as shown in Figure 4.
When the voltage on bus is higher than preset voltage value, M21 is driven to height, and M21 turns on, and N end pulled down to 0.
When the voltage on bus is less than preset voltage value, M21 turns off.
Further, comparator U21 uses a hysteresis loop comparator so that the setting value of busbar voltage is provided with one
Fixed hysteresis voltage, further enhances the stability of work.Logic circuit can also be realized by modes such as programmings
710 carry out timing to the ON time of switch M21 after switch M21 conducting, when the ON time of switch M21 reaches
After the setting time, logic circuit 710 controls switch M21 and turns off, and can also strengthen control circuit work equally
Stability.
Correspondingly, conceiving based on same utility model, this utility model embodiment additionally provides a kind of LED and drives electricity
Road, as shown in Figures 1 to 3, including rectification circuit 100, filter circuit 200, LED driver 300 and above-mentioned
The voltage control circuit that any embodiment provides.
Wherein, rectification circuit 100, filter circuit 200 and LED driver 300 are the most in parallel, input signal
Input from the input of rectification circuit 100, after the filtering of filtered circuit 200, drive LED by LED driver 300.
Connection between voltage control circuit and rectification circuit 100, filter circuit 200 and LED driver 300 and position
The relation of putting refer to above-described embodiment, the most no longer redundant later.
Rectification circuit 100 in the present embodiment can use single ended input bridge rectifier, as shown in Figure 1 to Figure 3.
Double-width grinding bridge rectifier can also be used, as shown in Figure 5.During electrical network input, input is connected to L end and N
End.When inputting for electric ballast, can connect L end or N end with one end, the other end connects N1 end, and electronics town
The input of stream device testing circuit 400 connects N1 end.So, only when electric ballast inputs, electronic ballast
Device testing circuit 400 just has input signal, and otherwise its input is unsettled.Use above-mentioned double-width grinding bridge rectifier
The accuracy of electric ballast detection can be improved further.
Further, filter circuit 200 can individually use an electric capacity to realize, it would however also be possible to employ such as Fig. 1 to 3
The shown π type filter circuit being made up of electric capacity C23, electric capacity C24 and inductance L21 realizes.LED driver
300 can use constant-current drive circuit, such as circuit of reversed excitation, Buck conversion circuit etc..
The LED drive circuit that this utility model embodiment provides, can the most compatible electrical network input and electric ballast
Input.By the voltage on control bus so that the pressure of LED driver can come according to the requirement of electrical network input
Select, greatly reduce the production cost of LED drive circuit, improve system reliability.
Particular embodiments described above, has carried out entering one to the purpose of this utility model, technical scheme and beneficial effect
The detailed description of step, it will be appreciated that the foregoing is only specific embodiment of the utility model, is not used to limit
Fixed protection domain of the present utility model.Particularly point out, to those skilled in the art, all of the present utility model
Within spirit and principle, any modification, equivalent substitution and improvement etc. done, should be included in guarantor of the present utility model
Within the scope of protecting.
Claims (11)
1. a voltage control circuit, for the voltage on the bus in LED drive circuit is controlled, described
LED drive circuit includes rectification circuit, filter circuit and LED driver in parallel successively, it is characterised in that should
Voltage control circuit includes:
Electric ballast testing circuit, connects the input of described rectification circuit, to detect the input of described rectification circuit
Whether signal is from electric ballast；
One way conducting device, is connected on the bus between described rectification circuit and described filter circuit, and its forward end is even
Connecing described rectification circuit, end of oppisite phase connects described filter circuit；
Voltage detecting circuit, in parallel with described filter circuit, and it is positioned at described one way conducting device and described LED driving
Between device, whether to detect the voltage on described bus higher than preset voltage value；
Switch, is connected in parallel on the outfan of described rectification circuit；When described switch conduction, the output of described rectification circuit
Holding by described switch discharge, described filter circuit constitutes drive circuit with described LED driver；
And control circuit, its input connects described voltage detecting circuit and described electric ballast testing circuit, output
End connects described switch；Described control circuit in the input signal of described rectification circuit from described electric ballast and mother
When voltage on line is higher than described preset voltage value, control described switch conduction.
Voltage control circuit the most according to claim 1, it is characterised in that described one way conducting device is
One diode or triode.
Voltage control circuit the most according to claim 1, it is characterised in that described switch is transistor.
4. according to the voltage control circuit described in any one of claims 1 to 3, it is characterised in that described electronics town
Stream device testing circuit judges the defeated of described rectification circuit by detecting the rate of change of the input voltage of described rectification circuit
Whether enter signal from described electric ballast.
Voltage control circuit the most according to claim 4, it is characterised in that described electric ballast detection electricity
Road includes the first electric capacity, the second electric capacity, the second diode, the 3rd diode and the first resistance；
Described first electric capacity, its one end connects the input of described rectification circuit, and the other end connects described second diode
Anode；
The negative electrode of described second diode passes through described second capacity earth；
Described 3rd diode, its plus earth, negative electrode is connected between described first electric capacity and described second diode；
Described first resistance, in parallel with described second electric capacity, one end ground connection, the other end is connected to described two or two pole
Outfan between pipe and described second electric capacity and as described electric ballast testing circuit connects with described control circuit
Connect.
6. according to the voltage control circuit described in any one of claims 1 to 3, it is characterised in that described electronics town
Stream device testing circuit judges the input of described rectification circuit by the frequency detecting the input voltage of described rectification circuit
Whether signal is from described electric ballast.
7. according to the voltage control circuit described in any one of claims 1 to 3, it is characterised in that described control electricity
Road includes the first comparator, the second comparator and logic circuit；
Described first comparator, its first input end connects the outfan of described voltage detecting circuit, and the second input is even
Connect the first reference voltage；
Described second comparator, its first input end connects the outfan of described electric ballast testing circuit, and second is defeated
Enter end and connect the second reference voltage；
Described logic circuit, its input connects described first comparator and the outfan of described second comparator, output
End connects described on-off circuit.
Voltage control circuit the most according to claim 7, it is characterised in that described first comparator is hysteresis
Comparator.
Voltage control circuit the most according to claim 7, it is characterised in that described logic circuit is additionally operable to
After described switch conduction, the ON time to described switch carries out timing, when the ON time of described switch reaches to set
After between, described logic circuit controls described switch OFF.
10. a LED drive circuit, including rectification circuit, filter circuit and LED driver in parallel successively,
It is characterized in that, also include the voltage control circuit described in any one of claim 1 to 9.
11. LED drive circuits according to claim 10, it is characterised in that described rectification circuit is single-ended
Input bridge rectifier or double-width grinding bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620362983.8U CN205622931U (en) | 2016-04-26 | 2016-04-26 | Voltage control circuit and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620362983.8U CN205622931U (en) | 2016-04-26 | 2016-04-26 | Voltage control circuit and LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205622931U true CN205622931U (en) | 2016-10-05 |
Family
ID=57027316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620362983.8U Withdrawn - After Issue CN205622931U (en) | 2016-04-26 | 2016-04-26 | Voltage control circuit and LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205622931U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704867A (en) * | 2016-04-26 | 2016-06-22 | 杰华特微电子（杭州）有限公司 | Voltage control circuit, light emitting diode (LED) driving circuit and control method of LED driving circuit |
| CN106684809A (en) * | 2017-02-17 | 2017-05-17 | 杰华特微电子（杭州）有限公司 | Protective circuit and illumination driving circuit |
-
2016
- 2016-04-26 CN CN201620362983.8U patent/CN205622931U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704867A (en) * | 2016-04-26 | 2016-06-22 | 杰华特微电子（杭州）有限公司 | Voltage control circuit, light emitting diode (LED) driving circuit and control method of LED driving circuit |
| CN106684809A (en) * | 2017-02-17 | 2017-05-17 | 杰华特微电子（杭州）有限公司 | Protective circuit and illumination driving circuit |
| CN106684809B (en) * | 2017-02-17 | 2021-02-02 | 杰华特微电子（杭州）有限公司 | Protection circuit and lighting driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161005 Effective date of abandoning: 20180112 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20161005 Effective date of abandoning: 20180112 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |