CN206181440U - Voltage sampling circuit - Google Patents
Voltage sampling circuit Download PDFInfo
- Publication number
- CN206181440U CN206181440U CN201621167057.1U CN201621167057U CN206181440U CN 206181440 U CN206181440 U CN 206181440U CN 201621167057 U CN201621167057 U CN 201621167057U CN 206181440 U CN206181440 U CN 206181440U
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- voltage
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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 discloses a voltage sampling circuit holds through ground end of the reference with control circuit and system bigly and connects through the sampling resistor, and the source electrode and the control circuit reference ground end of power switch pipe are connected, and the connection is held bigly by the voltage detecting foot and the system of sampling resistor. When the LED electric current flow through the sampling resistor, the sample voltage polarity that control circuit obtained was the burden like this, then the absolute value information of control circuit through conversion acquisition sample voltage signal to the realization is to the control of LED electric current. Adopt the utility model discloses a control strategy, the bars source voltage of power switch pipe does not receive the influence of sampling resistor voltage, the phenomenon that driving voltage is not enough can not appear, and the source electrode of power switch pipe need not special ESD and handles reduced size, reduce cost, and when control circuit gets the electricity from the drain electrode of power switch pipe, its operating current sampling resistor of can flowing through, output current control accuracy is high.
Description
Technical field
This utility model is related to field of switch power, more particularly, it relates to a kind of voltage sampling circuit.
Background technology
The schematic diagram of traditional LED drive circuit is as shown in figure 1, be to control LED's by linear mode shown in Fig. 1
Driving current, linear regulator includes power switch pipe M01, control circuit 101 and sampling resistor R01.AC-input voltage Jing
The pulsating dc voltage VIN of a twice power frequency is obtained after over commutation bridge (D01-D04) rectification, when the DC voltage VIN it is big
When pressure drop (VLED) of LED load, then the power switch pipe M01 for connecting with LED load begins to turn on, control circuit 101
Ground (such as AGND in Fig. 1) and system the earth (such as SGND in Fig. 1) are to be joined directly together, and the electric current of LED flows through sampling resistor R01,
It is VRs=Iout*R01 that the sampling pin of control circuit 101 is the voltage that Rs feet are sampled, and such VRs is a positive voltage.It
Afterwards, sampled voltage VRs and reference voltage V REF are input into the input of operational amplifier, and adjusting through amplifier finally can obtain
VRs=VREF, so as to realize the control to LED current, wherein reference voltage V REF for control circuit internal reference, or electric current
The output of compensation circuit.
If the supply voltage of operational amplifier is VDD (generally 5V), due to control circuit with system the earth altogether, institute
Gate source voltage with power switch pipe M01 is：VGS=VDD-VRs, it is clear that sampled voltage VRs is bigger, then gate source voltage VGS gets over
It is little, but too small gate source voltage VGS is likely to be such that power switch pipe saturation so that LED current is low compared with setting value, it is impossible to real
Existing constant current.Additionally, the Rs feet of control circuit and power switch pipe M01 source electrode connection, due to the grid source of power switch pipe M01 it is resistance to
Pressure is resistance to compared with drain-source to be forced down, so the grid in order to protect power switch pipe M01, the special Electro-static Driven Comb (ESD) of pin needs
Process.Finally, in order to reduce the current supply loss of control circuit, general control circuit from the drain electrode power taking of power switch pipe M01, this
The operating current of sample control circuit can flow through LED and without sampling resistor, affect the control accuracy of LED current.
Utility model content
In view of this, the utility model proposes a kind of voltage sampling circuit, by the reference ground terminal for arranging control circuit
So that the sampled voltage polarity that control circuit is obtained is negative, the absolute value letter of sampled voltage is then obtained by conversion
Breath, so as to realize the effective control to LED current.
According to a kind of voltage sampling circuit of the present utility model, including control circuit, power switch pipe and sampling resistor,
The reference ground terminal of the control circuit is connected with the first end of the sampling resistor, the second end of the sampling resistor
Connect big ground terminal；
The source electrode of the power switch pipe is connected with the reference ground terminal of the control circuit；
The sampling end of the control circuit connects the second end of the sampling resistor, the electricity at the second end of the sampling resistor
Sampled voltage signal of the pressure signal as the control circuit.
Further, the control circuit includes resistor voltage divider network and operational amplification circuit,
The first end of the resistor voltage divider network receives reference voltage signal, and the second end connects the sampling of the control circuit
To receive the sampled voltage signal, the voltage of the public junction point of the resistor voltage divider network is passed as the first voltage division signal at end
It is defeated by the first input end of the operational amplification circuit；
Second input of the operational amplification circuit connects the reference ground terminal of the control circuit, the operation amplifier electricity
The outfan output control signal on road controls the on off state of the power switch pipe.
Further, the control circuit includes voltage-current converter circuit and current error amplifier,
The voltage-current converter circuit receives reference voltage signal and the sampled voltage signal, corresponding to be converted to
Reference current signal and sampled current signals；
The current error amplifier receives the reference current signal and the sampled current signals, is put with carrying out error
Outfan output control signal controls the on off state of the power switch pipe after macrooperation.
Further, the voltage-current converter circuit include circuit structure identical first voltage current converter circuit and
Second voltage current converter circuit,
The first voltage current converter circuit receives the reference voltage signal, to be converted to the reference current letter
Number；
The second voltage current converter circuit receives the sampled voltage signal, to be converted to the sample rate current letter
Number.
Further, the first voltage current converter circuit and second voltage current converter circuit include the first error
Circuit, first switch pipe, first resistor and the first current mirroring circuit,
First current mirroring circuit, first switch pipe and first resistor are sequentially connected in series in first voltage source and reference
Between ground terminal；
The first input end of first error circuit receives voltage signal to be converted, and the second input is connected to described
The public connecting end of first switch pipe and first resistor, outfan is connected to the control end of the first switch pipe；
Further, the current error amplifier includes being mirrored into the second switch pipe and the 3rd switching tube of circuit,
First polar end of the second switch pipe and the 3rd switching tube is respectively connected to by the first current source
The second voltage source；
Second polar end of the second switch pipe and the 3rd switching tube receive respectively the reference current signal and
The sampled current signals；
The signal of the points of common connection of the second switch pipe and first current source is transmitted as the control signal
To the power switch pipe control end.
Preferably, the reference voltage signal is the internal reference voltage signal of the control circuit.
Preferably, the control circuit also includes integral controller,
The integral controller receives the internal reference voltage signal and the sampled voltage signal of control circuit, the product
The reference voltage signal and the sampled voltage signal are converted to compensating electric capacity is charged after current signals by sub-controller, institute
The voltage at compensating electric capacity two ends is stated as the reference voltage signal.
Preferably, the power switch pipe, the sampling resistor successively with connected in series with the load.
According to a kind of LED drive circuit of the present utility model, the LED drive circuit includes above-mentioned voltage sample electricity
Road,
Output ripple DC voltage is driving LED load after the rectified bridge rectification of external input voltage；
The control circuit produces the on off state that control signal controls the power switch pipe, is born with controlling the LED
The electric current of load.
In sum, according to a kind of voltage sampling circuit of this utility model and LED drive circuit, by by control circuit
Connected by sampling resistor with reference to ground terminal and the big ground terminal of system, the source electrode and control circuit of power switch pipe connect with reference to ground terminal,
The voltage detecting foot of sampling resistor and the big ground terminal connection of system.So when LED current flows through sampling resistor, control circuit is obtained
Sampled voltage polarity be negative.Then control circuit obtains the absolute value information of sampled voltage signal by conversion, so as to realize
Control to LED current.
Compared with prior art, this utility model at least has the advantages that：
1) after using negative pressure sampling plan, from the point of view of circuit topology, control circuit is with reference to ground terminal and the source of power switch pipe
Pole is joined directly together, and the gate source voltage of such power switch pipe is not affected by sampling resistor voltage, in being not in background technology
Gate source voltage reduces as sampling resistor voltage increases, cause power switch tube drives undertension, output current reduction
Phenomenon.
2) because the source electrode of power switch pipe is connected together with control circuit with reference to ground terminal, therefore, power switch pipe
Source electrode process without the need for special ESD protections, circuit volume, reduces cost can be reduced.
3) control circuit from the drain electrode power taking of power switch pipe when, its operating current can flow through sampling resistor rather than LED
Load, control circuit power supplying efficiency can ensure that good output current control accuracy while higher.
Description of the drawings
Fig. 1 is the schematic diagram of the LED drive circuit of prior art；
Fig. 2 show the schematic diagram according to LED drive circuit of the present utility model；
Fig. 3 show the circuit diagram of the first embodiment according to control circuit of the present utility model；
Fig. 4 show the circuit diagram of the second embodiment according to control circuit of the present utility model；
Fig. 5 show a kind of implementation of V/I circuits in Fig. 4；
Fig. 6 is a kind of implementation of current error amplifier in Fig. 4；
Fig. 7 show the circuit diagram of the 3rd embodiment according to control circuit of the present utility model.
Specific embodiment
Some preferred embodiments of the present utility model are described in detail below with reference to accompanying drawing, but this utility model is not limited to
This.
It is the schematic diagram according to LED drive circuit of the present utility model with reference to Fig. 2, the LED drive circuit is to drive
LED load, after rectified bridge (D01-D04) rectification of external communication input voltage output ripple DC voltage VIN with drive LED bear
Carry.
In this utility model embodiment, LED drive circuit also includes voltage sampling circuit, as shown in Fig. 2 the voltage is adopted
Sample circuit includes control circuit 201, power switch pipe M01 and sampling resistor R01, the power switch pipe M01, sampling resistor
R01 is connected in series successively with LED load；Reference ground terminal AGND of the control circuit 201 and the first of the sampling resistor R01
End connection, big ground terminal SGND of the second termination of the sampling resistor；The source electrode of the power switch pipe M01 and the control circuit
201 reference ground terminal AGND connection；The sampling end of the control circuit 201 connects the second end of the sampling resistor, described to adopt
Sampled voltage signal VRs of the voltage signal at the second end of sample resistance as the control circuit.Here, big ground terminal is referred to
The ground terminal of LED drive system.
Obviously, by the design of this utility model embodiment, when LED current flows through sampling resistor, relative to control
For the reference ground terminal of circuit processed, the sampled voltage signal polarity that the sampling end of control circuit is obtained is negative, sampled voltage signal
Computing formula be：VRs=Iout × R01, control circuit can carry out conversion process to the sampled voltage signal for obtaining, to obtain
The absolute value information of sampled voltage signal is obtained, and controls the electric current of LED load accordingly.Using the sampling plan of negative voltage, due to
The source electrode of power switch pipe M01 is directly connected to and refers to ground terminal, and the gate source voltage VGS sizes of such power switch pipe M01 are not received
The impact of sampling resistor voltage, is not in that driving voltage is not enough, the phenomenon that output current reduces, in addition power switch pipe M01
Source electrode without the need for special ESD process, and control circuit 201 from the drain electrode power taking of power switch pipe M01 when, its operating current
Sampling resistor can be flowed through, control circuit power supplying efficiency can ensure that good output current control accuracy while higher.
The process that control circuit is processed the negative voltage sampled will be introduced by embodiment below, but each embodiment is only
It is a kind of example for realizing the function, those of ordinary skill in the art understand that the implementation of control circuit has various.With reference to figure
3 circuit diagrams for showing the first embodiment according to control circuit of the present utility model；The control circuit 201 includes partial pressure electricity
Resistance network (including the resistance R1 and resistance R2 of series connection) and operational amplification circuit (operational amplifier U1), the resistor voltage divider network
First end receive reference voltage signal VREF, the second end connects the sampling end of the control circuit to receive the sampled voltage
Signal VRs, the voltage VA of the public junction point A points of the resistor voltage divider network is transferred to the computing as the first voltage division signal
The first input end (input in the same direction) of amplifying circuit；Second input (reverse input end) connection of the operational amplification circuit
Reference ground terminal AGND of the control circuit, the outfan output control signal of the operational amplification circuit controls the power and opens
The on off state of pipe M01 is closed, described on off state includes conducting, cut-off and the electric current adjustment for non-fully turning on, in this reality
In new, the gate source voltage of the power switch pipe M01 is mainly adjusted.
Here, the reference voltage signal VREF can be the reference voltage signal inside control circuit, can also be logical
(with specific reference to the example shown in Fig. 7, specific work process is referring under for the reference voltage signal crossed after integral controller conversion process
Elaboration in text), illustrate by taking internal reference voltage signal as an example in the present embodiment.Resistance R1 in resistor voltage divider network
It is two resistance of resistance identical with resistance R2, then the magnitude of voltage of the input in the same direction of operational amplifier is VA=(VREF+
VRs)/2.According to the operation principle of operational amplifier, if reference voltage signal VREF is big more than the absolute value of sampled voltage signal
Little-VRs, then the voltage VA of input in the same direction>0, the output of operational amplifier increases, and the gate source voltage of power switch pipe M01 becomes
Greatly, then output current increases, and the absolute value of sampled voltage signal VRs is caused then and is increased, until sampled voltage signal slightly exhausted
Reference voltage signal VREF is equal to being worth size-VRs；Vice versa, so as to realize the effective control to LED load peak point current
System.
In this utility model, the reference ground of negative pressure sample circuit and ground terminal (the i.e. system using its LED drive circuit
Ground) different potentials, the current potential of the reference ground of negative pressure sample circuit than systematically high, its pressure reduction equal to sampling resistor pressure drop,
That is, the current potential of the reference ground of negative pressure sample circuit changes with the change of pressure drop on sampling resistor.
The circuit diagram of the second embodiment according to control circuit of the present utility model, the control electricity are shown with reference to Fig. 4
Road 201 includes voltage-current converter circuit and current error amplifier, and here, the voltage-current converter circuit is tied including circuit
Structure identical first voltage current converter circuit (such as V/I in Fig. 4) and second voltage current converter circuit (such as-V/I in Fig. 4),
The first voltage current converter circuit receives the reference voltage signal VREF, to be converted to the reference current signal
IREF；The second voltage current converter circuit receives the sampled voltage signal VRs, to be converted to the sample rate current letter
Number-IRs.The current error amplifier receives the reference current signal IREF and sampled current signals-IRs, to enter
Row error amplifies the gate source voltage that outfan output control signal VG after computing adjusts the power switch pipe M01.
Further, a kind of implementation of V/I circuits in Fig. 4, the first voltage electric current conversion are shown with reference to Fig. 5
Circuit and second voltage current converter circuit include the first error circuit EA1, first switch pipe T1, first resistor R1 and first
Current mirroring circuit (such as the current mirroring circuit being made up of switch transistor T 2 and switch transistor T 3 in Fig. 5).First current mirroring circuit,
One switching tube and first resistor are sequentially connected in series in first voltage source U1 and with reference between ground terminal AGND；The first error electricity
The first input end on road receives voltage signal V1 (such as the voltage signal VREF or VRs in Fig. 4) to be converted, and the second input connects
The public connecting end of the first switch pipe and first resistor is connected to, outfan is connected to the control of the first switch pipe T1
End；The outfan of first current mirroring circuit exports the current signal of converted process, and the circuit structure in Fig. 5 can
Know, the voltage of first resistor R1 is V1, then output current I1=V1/R1 of switch transistor T 3, is thus capable of achieving turning for voltage x current
Change.
Further, with reference to a kind of implementation that Fig. 6 is current error amplifier in Fig. 4；The current error amplifies
Device includes being mirrored into the second switch pipe T4 and the 3rd switch transistor T 5 of circuit, the second switch pipe T4 and the 3rd switching tube
First polar end of T5 all by the first current source (such as current source I in Fig. 6) is connected to the second voltage source U2 respectively；Second switch
Pipe T4 and the 3rd switch transistor T 5 are identical switching tube, and the current source being connected with both is equal, the second switch pipe
With the second polar end of the 3rd switching tube receive respectively the reference current signal IREF and the sampled current signals-
IRs；The signal of the points of common connection B of the second switch pipe and first current source is transferred to as control signal VG
The power switch pipe M01 control ends.
Understand with reference to the circuit diagram of Fig. 5 and Fig. 6, if when sampled current signals-IRs is more than reference current signal IREF,
The drain voltage of switch transistor T 5 is reduced, and the gate source voltage of power switch pipe M01 is reduced, then the electric current that sampling resistor R01 flows through subtracts
Little, the absolute value of sampled voltage signal VRs declines, then corresponding sampled current signals-IRs reduces, ideally electric current fortune
Amplification gain is infinitely great, sampled current signals thus can be finally obtained equal to reference current signal, it is achieved thereby that the control to LED current
System.
In the present embodiment, if reference voltage signal VREF is identical with the conversion proportion of sampled voltage signal VRs, can obtain
To VREF=-VRs=ILED × R01, i.e., when DC voltage VIN is more than LED pressure drop VLED, LED current and reference voltage are believed
It is number proportional.Using the control program of the present embodiment, sampled voltage interference control circuit reference voltage signal can be avoided, be strengthened
The capacity of resisting disturbance of control circuit.
The circuit diagram of the 3rd embodiment according to control circuit of the present utility model is shown with reference to Fig. 7, the present embodiment is
Integral controller is increased on the basis of Fig. 3 or Fig. 4 embodiments, as shown in fig. 7, the integral controller includes two V/I
Change-over circuit and compensating electric capacity C, two V/I change-over circuits receive respectively internal reference voltage signal VREF and the institute of control circuit
Sampled voltage signal VRs is stated, to be converted to corresponding current signal IREF and IRS, current signal IREF and IRS are to compensating electric capacity
C charges, and the voltage VREF1 at the compensating electric capacity two ends is used as the reference voltage signal.Here, internal reference voltage VREF and
Sampled voltage signal VRs is converted into current signal IREF and IRs by a fixed proportion, due to adopt voltage signal VRs polarity for
It is negative, so actually current signal IRs is that compensating electric capacity C is discharged, as IREF=-IRs, the total charging current of electric capacity
For 0, then its voltage VREF1 keeps constant, and system enters steady state voltage, reference voltage signal VREF in VREF1 and Fig. 3 or Fig. 4
Act on identical in subsequent control circuit, VREF=-VRs_ave=ILED_ave × R01, wherein VRs_ave is finally obtained
With the meansigma methodss that ILED_ave is respectively sampled voltage signal VRs and LED current ILED.In this utility model embodiment, adopt
Integral controller can realize DAZ gene to direct current signal, and circuit control is more accurate.
Above the application to voltage sampling circuit in LED drive circuit is explained in detail, but those skilled in the art
Understand, the negative voltage sampling plan of this utility model scheme can be used in any suitable circuit.
It is detailed to having carried out according to the voltage sampling circuit and LED drive circuit of preferred embodiment of the present utility model above
Describe, but the circuit and beneficial effect with regard to the patent should not be considered as being limited only to described above, disclosed enforcement
Example and accompanying drawing can be better understood from this utility model, therefore, embodiment and Figure of description content disclosed above be in order to
This utility model is better understood from, this utility model protection is not limited to limit the scope of the present disclosure, ordinary skill people
Member is to replacement, the modification of this utility model embodiment within protection domain of the present utility model.
Claims (9)
1. a kind of voltage sampling circuit, it is characterised in that including control circuit, power switch pipe and sampling resistor,
The reference ground terminal of the control circuit is connected with the first end of the sampling resistor, and the second termination of the sampling resistor is big
Ground terminal；
The source electrode of the power switch pipe is connected with the reference ground terminal of the control circuit；
The sampling end of the control circuit connects the second end of the sampling resistor, the voltage letter at the second end of the sampling resistor
Number as the control circuit sampled voltage signal.
2. voltage sampling circuit according to claim 1, it is characterised in that the control circuit includes resistor voltage divider network
And operational amplification circuit,
The first end of the resistor voltage divider network receives reference voltage signal, the second end connect the sampling end of the control circuit with
The sampled voltage signal is received, the voltage of the public junction point of the resistor voltage divider network is transferred to as the first voltage division signal
The first input end of the operational amplification circuit；
Second input of the operational amplification circuit connects the reference ground terminal of the control circuit, the operational amplification circuit
Outfan output control signal controls the on off state of the power switch pipe.
3. voltage sampling circuit according to claim 1, it is characterised in that the control circuit includes Voltage to current transducer
Circuit and current error amplifier,
The voltage-current converter circuit receives reference voltage signal and the sampled voltage signal, to be converted to corresponding reference
Current signal and sampled current signals；
The current error amplifier receives the reference current signal and the sampled current signals, and to carry out error fortune is amplified
Outfan output control signal controls the on off state of the power switch pipe after calculation.
4. voltage sampling circuit according to claim 3, it is characterised in that the voltage-current converter circuit includes circuit
Structure identical first voltage current converter circuit and second voltage current converter circuit,
The first voltage current converter circuit receives the reference voltage signal, to be converted to the reference current signal；
The second voltage current converter circuit receives the sampled voltage signal, to be converted to the sampled current signals.
5. voltage sampling circuit according to claim 4, it is characterised in that the first voltage current converter circuit and
Two voltage-current converter circuits include the first error circuit, first switch pipe, first resistor and the first current mirroring circuit,
First current mirroring circuit, first switch pipe and first resistor are sequentially connected in series in first voltage source and refer to ground terminal
Between；
The first input end of first error circuit receives voltage signal to be converted, and the second input is connected to described first
The public connecting end of switching tube and first resistor, outfan is connected to the control end of the first switch pipe；
The outfan of first current mirroring circuit exports the current signal of converted process.
6. voltage sampling circuit according to claim 3, it is characterised in that the current error amplifier includes being mirrored into
The second switch pipe and the 3rd switching tube of circuit,
First polar end of the second switch pipe and the 3rd switching tube is respectively connected to second by the first current source
Voltage source；
Second polar end of the second switch pipe and the 3rd switching tube receives respectively the reference current signal and described
Sampled current signals；
The signal of the points of common connection of the second switch pipe and first current source is transferred to institute as the control signal
State power switch pipe control end.
7. the voltage sampling circuit according to Claims 2 or 3, it is characterised in that the reference voltage signal is the control
The internal reference voltage signal of circuit processed.
8. the voltage sampling circuit according to Claims 2 or 3, it is characterised in that the control circuit also includes integration control
Device processed,
The integral controller receives the internal reference voltage signal and the sampled voltage signal of control circuit, the integration control
The reference voltage signal and the sampled voltage signal are converted to compensating electric capacity is charged after current signals by device processed, the benefit
The voltage at electric capacity two ends is repaid as the reference voltage signal.
9. voltage sampling circuit according to claim 1, it is characterised in that the power switch pipe, the sampling resistor
Successively with connected in series with the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621167057.1U CN206181440U (en) | 2016-10-26 | 2016-10-26 | Voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621167057.1U CN206181440U (en) | 2016-10-26 | 2016-10-26 | Voltage sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206181440U true CN206181440U (en) | 2017-05-17 |
Family
ID=58679862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621167057.1U Expired - Fee Related CN206181440U (en) | 2016-10-26 | 2016-10-26 | Voltage sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206181440U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385734A (en) * | 2016-10-26 | 2017-02-08 | 杰华特微电子（杭州）有限公司 | Voltage sampling circuit |
| CN108551702A (en) * | 2017-10-09 | 2018-09-18 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving control system |
-
2016
- 2016-10-26 CN CN201621167057.1U patent/CN206181440U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385734A (en) * | 2016-10-26 | 2017-02-08 | 杰华特微电子（杭州）有限公司 | Voltage sampling circuit |
| CN106385734B (en) * | 2016-10-26 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | A kind of voltage sampling circuit |
| CN108551702A (en) * | 2017-10-09 | 2018-09-18 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving control system |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170517 Termination date: 20191026 |