CN206923102U - The linear invariable power LED drive integrated circults in three-temperature-zone - Google Patents
The linear invariable power LED drive integrated circults in three-temperature-zone Download PDFInfo
- Publication number
- CN206923102U CN206923102U CN201720890979.3U CN201720890979U CN206923102U CN 206923102 U CN206923102 U CN 206923102U CN 201720890979 U CN201720890979 U CN 201720890979U CN 206923102 U CN206923102 U CN 206923102U
- Authority
- CN
- China
- Prior art keywords
- transistor
- temperature
- lamp bead
- led lamp
- terminal
- 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.)
- Expired - Fee Related
Links
Abstract
It the utility model is related to a kind of linear invariable power LED drive integrated circults in three-temperature-zone, the power of electric current, nearly zero temp shift reference voltage and subzero temperature reference voltage adjustment driving LED lamp bead when its constant-current drive circuit works according to LED lamp bead, to cause constant-current drive circuit is loaded into the power in LED lamp bead to be adapted with the operating temperature of LED lamp bead；When LED lamp bead operating temperature close to the LED lamp bead the limit junction temperature when, junction temperature temperature protection circuit turn off constant-current drive circuit to the driving in LED lamp bead.Before to LED lamp bead the temperature of light decay does not occur for low temperature, power output is basically unchanged the utility model；More than the temperature range that light decay occurs for LED lamp bead, subtract power work；Turned off before LED lamp bead or drive circuit reach capacity junction temperature damage, and can guarantee that the reliability in high pressure or high voltage transient impact.
Description
Technical field
A kind of drive integrated circult is the utility model is related to, especially a kind of linear invariable power LED drivings in three-temperature-zone are integrated
Circuit, belong to the technical field of LED drive circuit.
Background technology
At present, in the prior art, passed through to solve burnout problems at a high temperature of LED lamp bead frequently with linear constant current power for illumination
The scheme in source, at high temperature as 115 DEG C when circuit carry out temperature protection, at this moment rapid decay or shut-off driving current.It is but actual
Upper LED lamp bead has started to influence the light decay of lamp bead when temperature is risen to such as more than 80 DEG C, so, preferable lamp bead driving electricity
Road should be low temperature or driving power is constant at room temperature, but in high temperature such as 80 DEG C proceed by slow power attenuation to reduce work
Make temperature, temperature rise towards lamp bead limit junction temperature such as more than 115 DEG C when, rapidly switch off driving power.
In addition, linear constant current LED drive circuit, generally when input voltage increases, power output is with increase, it is difficult to protects
Card LED drive circuit is operated in invariable power state.
The content of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of linear invariable power in three-temperature-zone
LED drive integrated circults, it sets three kinds of temperature working curves according to LED lamp bead different temperatures, i.e., in low temperature to LED lamp bead
Before the temperature that light decay does not occur, power output is basically unchanged；More than the temperature range that light decay occurs for LED lamp bead, subtract power
Work；Turn off, and can guarantee that in high pressure or high voltage transient impact before LED lamp bead or drive circuit reach capacity junction temperature damage
When reliability.
According to technical scheme provided by the utility model, the linear invariable power LED drive integrated circults in three-temperature-zone, including
For driving the constant-current drive circuit of LED lamp bead；Also include the nearly zero temp shift voltage reference being connected with the constant-current drive circuit
Subzero temperature drift voltage reference circuit and junction temperature temperature protection circuit under circuit, high temperature；When LED lamp bead works in low-temperature condition,
Nearly zero temp shift voltage reference circuit can provide nearly zero temp shift reference voltage, and LED lamp bead operating temperature produces optical attenuation close to LED
Temperature range when, subzero temperature drift voltage reference circuit can provide the subzero temperature reference voltage by coefficient attenuation under high temperature；
Electric current, nearly zero temp shift reference voltage and subzero temperature reference voltage when constant-current drive circuit works according to LED lamp bead
The power of adjustment driving LED lamp bead, to cause constant-current drive circuit to be loaded into the work of the power in LED lamp bead and LED lamp bead
Temperature is adapted；When LED lamp bead operating temperature close to the LED lamp bead the limit junction temperature when, junction temperature temperature protection circuit close
Disconnected constant-current drive circuit is to the driving in LED lamp bead.
The constant-current drive circuit is also connected with constant power output overvoltage crowbar, changes or exists high in input voltage
When pressing transient impact, the stability of constant-current drive circuit output driving power is ensured using constant power output overvoltage crowbar.
The constant-current drive circuit includes operational amplifier U1, driving power pipe and power adjustment resistance Rs, nearly zero temperature
Subzero temperature drift voltage reference circuit is connected with operational amplifier U1 in-phase end simultaneously under drift voltage reference circuit, high temperature, and computing is put
Big device U1 end of oppisite phase is connected with power adjustment resistance Rs one end and the source terminal of driving power pipe, operational amplifier U1's
Output end is connected with the gate terminal of driving power pipe, and the drain electrode end of driving power pipe forms drive output, and driving power pipe is adopted
Managed with VDMOS, power adjustment resistance Rs other end ground connection.
The operational amplifier U1 include transistor Q8, transistor Q9, transistor Q10, transistor Q11, transistor Q12 with
And transistor Q13, transistor Q8 emitter stage are connected with transistor Q9 base terminal, transistor Q9 emitter terminal and transistor
Q10 emitter stage connection, transistor Q10 base terminal are connected with transistor Q11 emitter terminal, transistor Q11 base terminal
It is connected with power adjustment resistance Rs, and transistor Q11 base terminal passes through voltage-regulator diode Z2 and driving power pipe gate terminal
Connection, transistor Q11 collector terminal ground connection, transistor Q10 collector terminal and transistor Q12 base terminal, transistor Q13
Base terminal and transistor Q13 collector terminal connection, transistor Q13 emitter terminal connection, transistor Q12 emitter stage
End ground connection, transistor Q12 collector terminal are connected with transistor Q9 collector terminal.
The junction temperature temperature protection circuit includes transistor Q14, transistor Q14 base terminal and electric capacity C11 one end with
And transistor Q12 collector terminal connection, the electric capacity C11 other end are connected with the gate terminal of driving power pipe, transistor Q14's
Emitter terminal is grounded.
The constant power output overvoltage crowbar includes transistor Q1, transistor Q1 collector terminal and driving power pipe
Gate terminal connection, transistor Q1 emitter terminal ground connection, transistor Q1 base terminal and resistance R1 one end, the one of resistance R2
End and adjustment protective resistance Rov one end connection, resistance R2 other end ground connection, the adjustment protective resistance Rov other end with
Rectifier D4 output end connection, rectifier D4 are connected with alternating current AC.
The light modulation for also including being connected with constant-current drive circuit enables control circuit, and the enabled control circuit of light modulation includes crystalline substance
Body pipe Q2, transistor Q2 collector terminal are connected with the gate terminal of driving power pipe, transistor Q2 emitter terminal ground connection, crystal
Pipe Q2 base terminal is connected with resistance R3 one end and resistance R4 one end, resistance R4 other end ground connection.
Also include voltage-stablizer, the voltage-stablizer includes transistor Q3, and transistor Q3 emitter terminal is grounded, transistor Q3's
Collector terminal is connected with starting resistance Rp one end, driving resistance Rg one end and voltage-regulator diode Z1 cathode terminal, and brilliant
Body pipe Q3 collector terminal is connected with voltage VCC, transistor Q3 base terminal and voltage-regulator diode Z1 anode tap and resistance
R5 one end connection, resistance R5 other end ground connection, start the resistance Rp other end and rectifier D4 output end and light
Diode HVLED anode tap connection, rectifier D4 are connected with alternating current AC, light emitting diode HVLED cathode terminal and driving
The drain electrode end connection of power tube, the driving resistance Rg other end are connected with the gate terminal of driving power pipe.
The advantages of the utility model：When LED lamp bead works in low-temperature condition, nearly zero temp shift voltage reference circuit can provide
Nearly zero temp shift reference voltage, when LED lamp bead operating temperature produces the temperature range of optical attenuation close to LED, subzero temperature floats under high temperature
Voltage reference circuit can provide the subzero temperature reference voltage by coefficient attenuation；Electricity when constant-current drive circuit works according to LED lamp bead
The power of stream, nearly zero temp shift reference voltage and subzero temperature reference voltage adjustment driving LED lamp bead, to cause constant-current drive circuit to add
The power being downloaded in LED lamp bead is adapted with the operating temperature of LED lamp bead；When the operating temperature of LED lamp bead is close to the LED
During the limit junction temperature of pearl, junction temperature temperature protection circuit turns off constant-current drive circuit to the driving in LED lamp bead, so as to according to LED
Lamp bead different temperatures sets three kinds of temperature working curves, i.e., before to LED lamp bead the temperature of light decay does not occur for low temperature, output
Power is basically unchanged；More than the temperature range that light decay occurs for LED lamp bead, subtract power work；Reached in LED lamp bead or drive circuit
Turned off before to the damage of limit junction temperature, and can guarantee that the reliability in high pressure or high voltage transient impact.
Brief description of the drawings
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
With reference to specific drawings and examples, the utility model is described in further detail.
As shown in Figure 1：In order to set three kinds of temperature working curves according to LED lamp bead different temperatures, i.e., in low temperature to LED
Before the temperature of light decay does not occur for lamp bead, power output is basically unchanged；More than the temperature range that light decay occurs for LED lamp bead, subtract
Power works；Turned off before LED lamp bead or drive circuit reach capacity junction temperature damage, the utility model includes being used to drive
The constant-current drive circuit of LED lamp bead；Also include nearly zero temp shift voltage reference circuit, the high temperature being connected with the constant-current drive circuit
Lower subzero temperature drift voltage reference circuit and junction temperature temperature protection circuit；When LED lamp bead works in low-temperature condition, nearly zero temp shift electricity
Pressure reference circuit can provide nearly zero temp shift reference voltage, and LED lamp bead operating temperature produces the temperature range of optical attenuation close to LED
When, subzero temperature drift voltage reference circuit can provide the subzero temperature reference voltage by coefficient attenuation under high temperature；
Electric current, nearly zero temp shift reference voltage and subzero temperature reference voltage when constant-current drive circuit works according to LED lamp bead
The power of adjustment driving LED lamp bead, to cause constant-current drive circuit to be loaded into the work of the power in LED lamp bead and LED lamp bead
Temperature is adapted；When LED lamp bead operating temperature close to the LED lamp bead the limit junction temperature when, junction temperature temperature protection circuit close
Disconnected constant-current drive circuit is to the driving in LED lamp bead.
Further, the constant-current drive circuit is also connected with constant power output overvoltage crowbar, is become in input voltage
When changing or high voltage transient impact be present, constant-current drive circuit output driving power is ensured using constant power output overvoltage crowbar
Stability.
The constant-current drive circuit includes operational amplifier U1, driving power pipe and power adjustment resistance Rs, nearly zero temperature
Subzero temperature drift voltage reference circuit is connected with operational amplifier U1 in-phase end simultaneously under drift voltage reference circuit, high temperature, and computing is put
Big device U1 end of oppisite phase is connected with power adjustment resistance Rs one end and the source terminal of driving power pipe, operational amplifier U1's
Output end is connected with the gate terminal of driving power pipe, and the drain electrode end of driving power pipe forms drive output, and driving power pipe is adopted
Managed with VDMOS, power adjustment resistance Rs other end ground connection.
As shown in Fig. 2 the operational amplifier U1 include transistor Q8, transistor Q9, transistor Q10, transistor Q11,
Transistor Q12 and transistor Q13, transistor Q8 emitter stage are connected with transistor Q9 base terminal, transistor Q9 transmitting
Emitter stage extremely with transistor Q10 is connected, and transistor Q10 base terminal is connected with transistor Q11 emitter terminal, transistor
Q11 base terminal is connected with power adjustment resistance Rs, and transistor Q11 base terminal passes through voltage-regulator diode Z2 and driving power
The gate terminal connection of pipe, transistor Q11 collector terminal ground connection, transistor Q10 collector terminal and transistor Q12 base stage
The collector terminal connection at end, transistor Q13 base terminal and transistor Q13, transistor Q13 emitter terminal connection, crystal
Pipe Q12 emitter terminal ground connection, transistor Q12 collector terminal are connected with transistor Q9 collector terminal.
Specifically, the junction temperature temperature protection circuit includes transistor Q14, and transistor Q14 base terminal is with electric capacity C11's
One end and transistor Q12 collector terminal are connected, and the electric capacity C11 other end is connected with the gate terminal of driving power pipe, crystal
Pipe Q14 emitter terminal ground connection.
The constant power output overvoltage crowbar includes transistor Q1, transistor Q1 collector terminal and driving power pipe
Gate terminal connection, transistor Q1 emitter terminal ground connection, transistor Q1 base terminal and resistance R1 one end, the one of resistance R2
End and adjustment protective resistance Rov one end connection, resistance R2 other end ground connection, the adjustment protective resistance Rov other end with
Rectifier D4 output end connection, rectifier D4 are connected with alternating current AC.
The light modulation for also including being connected with constant-current drive circuit enables control circuit, and the enabled control circuit of light modulation includes crystalline substance
Body pipe Q2, transistor Q2 collector terminal are connected with the gate terminal of driving power pipe, transistor Q2 emitter terminal ground connection, crystal
Pipe Q2 base terminal is connected with resistance R3 one end and resistance R4 one end, resistance R4 other end ground connection.
Also include voltage-stablizer, the voltage-stablizer includes transistor Q3, and transistor Q3 emitter terminal is grounded, transistor Q3's
Collector terminal is connected with starting resistance Rp one end, driving resistance Rg one end and voltage-regulator diode Z1 cathode terminal, and brilliant
Body pipe Q3 collector terminal is connected with voltage VCC, transistor Q3 base terminal and voltage-regulator diode Z1 anode tap and resistance
R5 one end connection, resistance R5 other end ground connection, start the resistance Rp other end and rectifier D4 output end and light
Diode HVLED anode tap connection, rectifier D4 are connected with alternating current AC, light emitting diode HVLED cathode terminal and driving
The drain electrode end connection of power tube, the driving resistance Rg other end are connected with the gate terminal of driving power pipe.
In the utility model embodiment, pass through process choice voltage-regulator diode Z1, transistor Q3 and transistor Q6
Enter trip temperature to mutually compensate for, wherein, voltage-regulator diode Z1 is positive temperature coefficient, and transistor Q3 and transistor Q6 are negative temperature system
Number, zero temp shift benchmark is obtained in operational amplifier U1 input by corresponding electric resistance partial pressure, when temperature is higher, resistance
R1, resistance R2 and transistor Q1 are functioned to, and the output current that such Radj ends are reflected does not follow operational amplifier U1
Benchmark change, but be decided by transistor Q1 and its subzero temperature amplification characteristic.
The realization of invariable power be by adjust protective resistance Rov sample rectification after line voltage, and reference voltage superposition
Controlling transistor Q1 conducting state controls the conducting electric current of driving power pipe.When temperature is very high, transistor Q5 conductings, and
Turn off driving power pipe and the grid of driving power pipe is protected by voltage-regulator diode Z2.Electric capacity C1 is anti-self-excitation electricity
Hold, operational amplifier U1 output is realized by transistor Q14 colelctor electrode.
EN is the pwm signal provided with outside, controls the break-make of driving power pipe, the dutycycle of driving power pipe break-make
Average current control LED brightness.VCC is internal voltage stabilizing, passes through resistance Rp power takings.Zero temp shift voltage leans on voltage-regulator diode
Z1, transistor Q3, transistor Q6 tc compensation obtain.
Claims (8)
1. a kind of linear invariable power LED drive integrated circults in three-temperature-zone, including for driving the constant-current drive circuit of LED lamp bead；
It is characterized in that：The nearly zero temp shift voltage reference circuit that also includes be connected with the constant-current drive circuit, subzero temperature floats voltage under high temperature
Reference circuit and junction temperature temperature protection circuit；When LED lamp bead works in low-temperature condition, nearly zero temp shift voltage reference circuit energy
Nearly zero temp shift reference voltage is provided, when LED lamp bead operating temperature produces the temperature range of optical attenuation close to LED, born under high temperature
Temperature drift voltage reference circuit can provide the subzero temperature reference voltage by coefficient attenuation；
Electric current, nearly zero temp shift reference voltage and the adjustment of subzero temperature reference voltage when constant-current drive circuit works according to LED lamp bead
The power of LED lamp bead is driven, to cause constant-current drive circuit to be loaded into the operating temperature of the power in LED lamp bead and LED lamp bead
It is adapted；When LED lamp bead operating temperature close to the LED lamp bead the limit junction temperature when, the shut-off of junction temperature temperature protection circuit is permanent
Drive circuit is flowed to the driving in LED lamp bead.
2. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 1, it is characterized in that：The constant current is driven
Dynamic circuit is also connected with constant power output overvoltage crowbar, when input voltage changes or high voltage transient impact be present, is utilized
Constant power output overvoltage crowbar ensures the stability of constant-current drive circuit output driving power.
3. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 1, it is characterized in that：The constant current is driven
Dynamic circuit includes operational amplifier U1, driving power pipe and power adjustment resistance Rs, nearly zero temp shift voltage reference circuit, high temperature
Lower subzero temperature drift voltage reference circuit is connected with operational amplifier U1 in-phase end simultaneously, operational amplifier U1 end of oppisite phase and power
Adjust resistance Rs one end and the source terminal connection of driving power pipe, operational amplifier U1 output end and driving power pipe
Gate terminal connects, and the drain electrode end of driving power pipe forms drive output, and driving power pipe is managed using VDMOS, power adjustment electricity
Hinder Rs other end ground connection.
4. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 3, it is characterized in that：The computing is put
Big device U1 includes transistor Q8, transistor Q9, transistor Q10, transistor Q11, transistor Q12 and transistor Q13, transistor
Q8 emitter stage is connected with transistor Q9 base terminal, and transistor Q9 emitter terminal is connected with transistor Q10 emitter stage, brilliant
Body pipe Q10 base terminal is connected with transistor Q11 emitter terminal, and transistor Q11 base terminal and power adjustment resistance Rs connect
Connect, and transistor Q11 base terminal is connected by voltage-regulator diode Z2 with the gate terminal of driving power pipe, transistor Q11 collection
Electrode tip is grounded, transistor Q10 collector terminal and transistor Q12 base terminal, transistor Q13 base terminal and transistor
Q13 collector terminal connection, transistor Q13 emitter terminal connection, transistor Q12 emitter terminal ground connection, transistor Q12's
Collector terminal is connected with transistor Q9 collector terminal.
5. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 4, it is characterized in that：The junction temperature temperature
Degree protection circuit includes transistor Q14, transistor Q14 base terminal and electric capacity C11 one end and transistor Q12 colelctor electrode
End connection, the electric capacity C11 other end are connected with the gate terminal of driving power pipe, transistor Q14 emitter terminal ground connection.
6. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 3, it is characterized in that：The invariable power
Output overvoltage protection circuit includes transistor Q1, and transistor Q1 collector terminal is connected with the gate terminal of driving power pipe, crystal
Pipe Q1 emitter terminal ground connection, transistor Q1 base terminal and resistance R1 one end, resistance R2 one end and adjustment protection electricity
Hinder Rov one end connection, resistance R2 other end ground connection, the output end of adjustment protective resistance the Rov other end and rectifier D4
Connection, rectifier D4 are connected with alternating current AC.
7. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 3, it is characterized in that：Also include and perseverance
The light modulation for flowing drive circuit connection enables control circuit, and the enabled control circuit of light modulation includes transistor Q2, transistor Q2's
Collector terminal is connected with the gate terminal of driving power pipe, transistor Q2 emitter terminal ground connection, transistor Q2 base terminal and electricity
Hinder R3 one end and resistance R4 one end connection, resistance R4 other end ground connection.
8. the linear invariable power LED drive integrated circults in three-temperature-zone according to claim 3, it is characterized in that：Also include voltage stabilizing
Device, the voltage-stablizer include transistor Q3, and transistor Q3 emitter terminal ground connection, transistor Q3 collector terminal is with starting resistance
The cathode terminal connection of Rp one end, driving resistance Rg one end and voltage-regulator diode Z1, and transistor Q3 collector terminal with
Voltage VCC connections, transistor Q3 base terminal are connected with one end of voltage-regulator diode Z1 anode tap and resistance R5, resistance R5
Other end ground connection, start resistance the Rp other end and rectifier D4 output end and light emitting diode HVLED anode tap
Connection, rectifier D4 are connected with alternating current AC, and light emitting diode HVLED cathode terminal is connected with the drain electrode end of driving power pipe,
The driving resistance Rg other end is connected with the gate terminal of driving power pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720890979.3U CN206923102U (en) | 2017-07-21 | 2017-07-21 | The linear invariable power LED drive integrated circults in three-temperature-zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720890979.3U CN206923102U (en) | 2017-07-21 | 2017-07-21 | The linear invariable power LED drive integrated circults in three-temperature-zone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206923102U true CN206923102U (en) | 2018-01-23 |
Family
ID=61348248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720890979.3U Expired - Fee Related CN206923102U (en) | 2017-07-21 | 2017-07-21 | The linear invariable power LED drive integrated circults in three-temperature-zone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206923102U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107155245A (en) * | 2017-07-21 | 2017-09-12 | 无锡市永晶光电科技有限公司 | The linear invariable power LED drive integrated circults in three-temperature-zone |
-
2017
- 2017-07-21 CN CN201720890979.3U patent/CN206923102U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107155245A (en) * | 2017-07-21 | 2017-09-12 | 无锡市永晶光电科技有限公司 | The linear invariable power LED drive integrated circults in three-temperature-zone |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103491682B (en) | Linear switching constant-current LED drive circuit for control over peak current | |
| CN103701033A (en) | Work protection system for DFB (distributed feed back) laser | |
| CN101916962A (en) | Equal-current synthetic high-power constant current power supply circuit | |
| CN206923102U (en) | The linear invariable power LED drive integrated circults in three-temperature-zone | |
| CN103533707A (en) | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit | |
| CN203608439U (en) | LED constant current power supply with over-temperature protection | |
| CN107155245B (en) | The linear invariable power LED drive integrated circult in three-temperature-zone | |
| CN204922823U (en) | Adjustable power is adjusted luminance to mix colours and is reviewed LED street lamp | |
| CN105934021A (en) | Overvoltage adjusting circuit for linear constant-current driving LED | |
| CN206920624U (en) | A kind of laser detector that can automatically adjust gain | |
| CN103427621B (en) | A kind of mining isolated intrinsic safety LED drive power | |
| CN107294199A (en) | A kind of compound voltage detecting switching circuit of logic | |
| CN208621708U (en) | A kind of alternating current power-off signal transmission circuit | |
| CN106332397B (en) | LED drive chip, LED drive circuit and LED lamp | |
| CN103457464A (en) | Current limiting circuit on basis of switching power supplies | |
| CN206341456U (en) | LED drive power and system | |
| CN206575634U (en) | A kind of dimming control switch LED constant current power supply | |
| CN206149575U (en) | Contravariant type membrane intelligent control drive circuit that adjusts luminance | |
| CN202979393U (en) | Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection | |
| CN109617011A (en) | One kind having earth leakage protective high voltage direct current solid-state relay circuit | |
| CN205791623U (en) | Charge port protector | |
| CN203827587U (en) | Large power LED driving circuit | |
| CN203352883U (en) | A LED driving and controlling circuit | |
| CN208241074U (en) | A kind of diode pumping solid laser power control circuit | |
| CN207219090U (en) | A kind of wide electronic light modulator of compatible voltage range |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180123 Termination date: 20200721 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |