CN205622936U - Snubber circuit and LED drive circuit - Google Patents
Snubber circuit and LED drive circuit Download PDFInfo
- Publication number
- CN205622936U CN205622936U CN201620398856.3U CN201620398856U CN205622936U CN 205622936 U CN205622936 U CN 205622936U CN 201620398856 U CN201620398856 U CN 201620398856U CN 205622936 U CN205622936 U CN 205622936U
- Authority
- CN
- China
- Prior art keywords
- circuit
- input
- voltage
- rectification
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model provides a snubber circuit and LED drive circuit, wherein, snubber circuit is including detecting control circuit, a control switch and damping element, in the input circuit of damping element series connection after the rectification, detect the input loop connection after control circuit and the rectification, obtain the input voltage in the input circuit after the rectification and carry out the comparison with input voltage and predetermined threshold voltage, when input voltage is higher than threshold voltage, detect a control circuit time delay output control signal, a control switch is connected with measuring control circuit with the damping element respectively, and a control switch is based on a control signal with the damping element short circuit. The utility model discloses a LED drive circuit includes this snubber circuit. The utility model discloses a snubber circuit and LED drive circuit can cushion low power dissipation and efficient to the surge current who produces betterly in the circuit.
Description
Technical field
This utility model relates to electronic circuit technology field, particularly to a kind of buffer circuit and LED drive circuit.
Background technology
At present, owing to LED is than traditional fluorescent lamp and electric filament lamp energy-conserving and environment-protective, so LED is the most gradually replaced
Change traditional fluorescent lamp and electric filament lamp.In the incandescent systems with controllable silicon dimmer, can use too
LED is replaced, and its structure sees Fig. 1.But, owing to controllable silicon is when conducting, its output end voltage has greatly
Voltage change ratio (dv/dt), cause producing bigger surge current at input.This surge current amplitude is higher,
Persistent period is short, easily causes silicon controlled to turn off by mistake, affects the steady operation of LED drive circuit, so that LED
Lamp produces flicker.Its input current iinWith input voltage waveform v after over commutationrecAs shown in Figure 2 a and 2 b.
In order to reduce the peak value of surge current, and reduce current changing rate when input current declines, need in rectification
Buffer circuit is sealed in after bridge.
As it is shown on figure 3, traditional buffer circuit is directly to seal in resistance R10 after rectifier bridge, its input current iin、
Input voltage waveform v after over commutationrecWith the voltage waveform on resistance R10 as shown in Figure 4.This resistance is controlled
During silicon incision, can effectively reduce the surge current of input, prevent controllable silicon dimmer from turning off by mistake, make LED drive
Galvanic electricity road steady operation, and then avoid LED to produce flicker.But input current flows continuously through resistance R10, causes
Having power consumption on R10, this power consumption greatly reduces the efficiency of system always.
Utility model content
For overcoming traditional buffer circuit that big, the system effectiveness low technical problem that cause buffering effect undesirable is lost, this
Utility model provides a kind of buffer circuit and LED drive circuit.
The buffer circuit that this utility model provides, including detection control circuit, the first control switch and damping element；
Described damping element, is connected in the input circuit after rectification；
Described detection control circuit, is connected with the input circuit after described rectification, obtains the input circuit after described rectification
In input voltage and described input voltage is compared with the threshold voltage preset, when described input voltage is higher than institute
When stating threshold voltage, described detection control circuit time delay exports the first control signal；
Described first controls switch, is connected with described damping element and described detection control circuit respectively, described first control
System switch is short-circuit by described damping element based on described first control signal.
As a kind of embodiment, the outfan of described detection control circuit is by the input after electric capacity and described rectification
Loop connects.
As a kind of embodiment, described first controls to switch as transistor.
As a kind of embodiment, described detection control circuit include input voltage sample circuit, the first comparator,
Delay circuit, logic circuit and drive circuit；
Described input voltage sample circuit, connects the input circuit after described rectification, samples described input voltage；
Described first comparator, its first input end connects the outfan of described input voltage sample circuit, the second input
End connects the first reference voltage, and outfan is sequentially connected with described delay circuit, logic circuit and drive circuit；
When the sampled voltage that described input voltage sample circuit obtains is higher than described first reference voltage, described first ratio
Relatively device exports the first comparison signal and arrives described logic circuit after described delay circuit time delay, described logic circuit according to
Described first comparison signal exports described first control signal, controls described first and controls switch by short for described damping element
Road.
As a kind of embodiment, the outfan of described first comparator is also connected with described logic circuit；
When the sampled voltage that described input voltage sample circuit obtains is less than or equal to described first reference voltage, described
First comparator directly exports the second comparison signal to described logic circuit, and described logic circuit compares according to described second
Signal exports the second control signal, controls described first and controls switch OFF, described damping element is cut described rectification
After input circuit in.
As a kind of embodiment, described input voltage sample circuit includes the first sampling resistor and the second sampling electricity
Resistance；
Described first sampling resistor is connected with described second sampling resistor, and the first connection end of described first sampling resistor is even
Connecing the input circuit after described rectification, the second connection end of described first sampling resistor is connect by described second sampling resistor
Ground.
As a kind of embodiment, described input voltage sample circuit also includes transistor；
Described transistor, its source electrode connects the input circuit after described rectification, the of drain electrode and described first sampling resistor
One connects end connects, and grid connects the earth terminal of described second sampling resistor.
As a kind of embodiment, described delay circuit include voltage source, current source, resistance, the second comparator,
Electric capacity and second controls switch；
Described voltage source passes through described resistance eutral grounding；
The outfan of described current source passes through described capacity earth, and the size of described current source is by the output of described voltage source
Electric current controls；
Described second comparator, its first input end connects the outfan of described current source, and the second input connects second
Reference voltage, outfan connects described logic circuit；
Described switch is in parallel with described electric capacity, and the end that controls of described switch connects the outfan of described first comparator；
When described switch control termination receive described first comparator output described first comparison signal time, described in open
Closing and disconnect, described electric capacity is charged by described current source, when the voltage on described electric capacity reaches described second reference voltage,
Described second comparator output time delayed signal is to described logic circuit.
As a kind of embodiment, described drive circuit is driven with current sources circuit or the driving of voltage source series resistance
Circuit.
Correspondingly, this utility model also provides for a kind of LED drive circuit, including controllable silicon dimmer, rectification circuit,
Filter circuit and LED driver, described rectification circuit, filter circuit and LED driver are the most in parallel, structure
Becoming input circuit, described dimmer is connected on the input of described input circuit, also includes delaying described in any of the above-described item
Rush circuit.
This utility model having the beneficial effects that compared to prior art:
The buffer circuit that this utility model provides, by series damped element in the input circuit after rectification, to controlled
The surge current produced in input circuit during silicon conducting buffers；And then according to the higher spy of surge current amplitude
Point, is provided with detection control circuit, to obtain the input voltage in the input circuit after rectification and by input voltage with pre-
If threshold voltage compare, when input voltage is higher than this threshold voltage, i.e. can determine whether now input circuit to produce
Having given birth to surge current, the damping element being now connected in input circuit preferably serves the effect of buffering；More enter one
Step, according to the characteristic that the surge current persistent period is short, this utility model arranges this detection control circuit time delay output first
Control signal, first controls switch the first control signal based on detection control circuit output by damping element short circuit.Prolong
Time the time can be configured according to the duration that the surge current of physical circuit occurs, i.e. more than surge current generation duration,
Thus realize after surge current terminates automatically by damping element short circuit, excise from input circuit, to reduce power consumption.
The LED drive circuit that this utility model provides includes this buffer circuit, simple in construction.
Buffer circuit of the present utility model and LED drive circuit, can be preferably to circuit when surge current occurs
The surge current of middle generation buffers, after surge current occurs can automatically by damping element or buffering device from
Short circuit in input circuit, thus greatly reduce power consumption, improve system work efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LED drive circuit in background technology with controllable silicon dimmer；
Fig. 2 a is the input current i after over commutation of the LED drive circuit shown in Fig. 1inWaveform diagram；
Fig. 2 b is the voltage v after over commutation of the LED drive circuit shown in Fig. 1recWaveform diagram；
Fig. 3 is the structural representation of the LED drive circuit in background technology with single resistance buffer circuit；
Fig. 4 is the input current i of the LED drive circuit shown in Fig. 3in, voltage v after over commutationrecAnd electricity
The waveform diagram of the voltage on resistance R10；
Buffer circuit that Fig. 5 provides for this utility model one embodiment and the structural representation of LED drive circuit；
Fig. 6 is the input current i of the LED drive circuit shown in Fig. 5inWith the voltage v after over commutationrec, first
Control GATE end and the waveform diagram of DRAIN end of switch M20；
Fig. 7 is the detection control circuit in the LED drive circuit shown in Fig. 5 and the one of input voltage sample circuit
The structural representation of embodiment；
Fig. 8 is that the structure of another embodiment of the input voltage sample circuit in the LED drive circuit shown in Fig. 5 is shown
It is intended to；
Fig. 9 is the structural representation of an embodiment of the delay circuit in the LED drive circuit shown in Fig. 7 and Fig. 8.
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.
This utility model embodiment provides a kind of buffer circuit, for the LED with controllable silicon dimmer is driven electricity
The input voltage on road buffers, and particular circuit configurations is as follows:
Seeing Fig. 5, controllable silicon dimmer 100 is connected on the input of rectifier bridge 200, rectifier bridge 200 successively with electricity
Hold C10 and LED driver 300 is in parallel, form input circuit.
After the buffer circuit that the present embodiment provides is arranged on rectifier bridge 200, control including detection control circuit 400, first
System switch M20 and damping element R10.Wherein, in the input circuit after damping element R10 is connected on rectification.Inspection
Survey control circuit 400 to be connected with the input circuit after rectification, the input voltage in input circuit after obtaining rectification
And input voltage is compared with the threshold voltage preset, when input voltage is higher than threshold voltage, detection controls electricity
Road 400 time delay exports the first control signal.First controls switch M20 controls electricity with damping element R10 and detection respectively
Road 400 connects, and first controls switch M20 the first control signal based on detection control circuit 400 output will damping unit
Part R10 short circuit.
This utility model, by series damped element in the input circuit after rectification, inputs back during to controlled silicon conducting
The surge current produced in road buffers；And then according to the higher feature of surge current amplitude, it is provided with detection control
Circuit, compares with the input voltage in the input circuit after obtaining rectification and by input voltage with default threshold voltage
Relatively, when input voltage is higher than this threshold voltage, i.e. can determine whether now input circuit to create surge current, now
The damping element being connected in input circuit preferably serves the effect of buffering；Further, hold according to surge current
The characteristic that the continuous time is short, this utility model arranges this detection control circuit time delay and exports the first control signal, and first controls
Switch the first control signal based on detection control circuit output by damping element short circuit.Concrete delay time can basis
The duration that the surge current of physical circuit occurs is configured, and i.e. more than surge current generation duration, thus realizes at wave
Gush after electric current terminates automatically by damping element short circuit, excise from input circuit, to reduce power consumption.
The buffer circuit that this utility model provides, simple in construction, it can be preferably to circuit when surge current occurs
The surge current of middle generation buffers, can be automatically short-and-medium from input circuit by damping element after surge current occurs
Road, thus greatly reduce the power consumption of damping element, improve system work efficiency.
Above-mentioned damping element is mainly used in buffering the surge current in input circuit, and it can be to be connected on input
One or more resistance in loop, it is also possible to be equivalent circuit or the device of other forms.First control switch is permissible
For transistor, such as NMOS tube, PMOS, CMOS tube, NPN pipe etc., it is illustrated that in all with metal-oxide-semiconductor
For exemplifying.The present embodiment uses resistance as damping element, use transistor to control switch as first, can be square
Just realize above-mentioned control function, simple in construction, low cost.
With continued reference to Fig. 5, as a kind of embodiment, the input (i.e. VIN) of detection control circuit 400 connects
Vrec, outfan (i.e. GATE) meets the first control switch M20.When detection control circuit 400 detects VIN
When voltage is less than threshold voltage, then GATE output low level, make the first control switch M20 turn off；When detection control
Circuit 400 processed detects when Vrec is higher than threshold voltage, then, after postponing certain time, GATE exports high level,
Make the first control switch M20 conducting, by buffer resistance R10 short circuit.
Input current iin, input voltage waveform v after over commutationrec, first control switch M20 GATE end ripple
Shape and DRAIN end waveform are as shown in Figure 6, it is seen then that accurate time delay controls technology and can ensure that this scheme has
There is good input voltage range compatible.
The GATE end actuating speed of the detection control circuit 400 in the present embodiment is fast, and switching loss is little.And first
Control switch M20 conducting time, detection control circuit 400 GATE voltage stabilization can be fully on one
Individual fixed voltage, such as 12V so that the conduction loss of the first control switch M20 is the least.So, use this reality
Execute that example provides and buffer circuit, ensureing on the basis of the reliable and stable work of system, substantially increasing system effectiveness.
Further, as a kind of embodiment, with continued reference to Fig. 1, the outfan of detection control circuit 400 is also
Electric capacity C30 can be connected, be connected with the input circuit after rectification by electric capacity C30.The setting of electric capacity C30, makes
The signal of the GATE end that must detect control circuit 400 rises needs the regular hour, so can reduce impedance variation
The input current concussion caused, makes system work more stable.
Specifically, seeing Fig. 7, detection control circuit 400 can include that input voltage sample circuit 410, first compares
Relatively device 420, delay circuit 430, logic circuit 440 and drive circuit 450.Wherein, input voltage sampling electricity
Road 410 connects the input circuit after rectification, to sample input voltage；First input of the first comparator 420
End connects the outfan of input voltage sample circuit 410, and the second input connects the first reference voltage VREF1, defeated
Go out end and be sequentially connected with delay circuit 430, logic circuit 440 and drive circuit 450；When input voltage sample circuit
When 410 sampled voltages obtained are higher than the first reference voltage, the first comparator 420 exports the first comparison signal through time delay
Arriving logic circuit 440 after circuit 430 time delay, logic circuit 440 is according to first comparison signal output the first control letter
Number, control the first control switch by damping element short circuit.
Further, the outfan of the first comparator 420 is also connected with logic circuit 440, when input voltage sampling electricity
When the sampled voltage that road 410 obtains is less than or equal to the first reference voltage VREF1, the first comparator 420 directly to
Logic circuit 440 exports the second comparison signal, and logic circuit 440 exports the second control signal according to the second comparison signal,
Control the first control switch OFF, damping element is cut in the input circuit after rectification.
Such as, when the output end voltage of input voltage sample circuit 410 is less than the first reference voltage VREF1, prolong
Time circuit 430 logic circuit 440 is not produced impact, and logic circuit 440 controls drive circuit 450 and exports low electricity
Flat, make the first control switch OFF of outside；When the output end voltage of input sampling circuit 420 is than the first reference voltage
When VREF1 is big, delay circuit 430 is sent to patrol after the output signal of the first comparator 420 is postponed certain time
Collecting circuit 440, logic circuit 440 controls drive circuit 450 and exports high level, makes the first control switch of outside lead
Logical.
With continued reference to Fig. 7, in order to make the rising edge of driving signal GATE have the regular hour, drive circuit 450 can
In the way of using driven with current sources, it would however also be possible to employ the mode of voltage source and resistant series controls switch to outside first
It is driven.
Input voltage sample circuit 410 can be to use the form of divider resistance, as shown in Figure 7.Due to input VIN
End is the high pressure of a few hectovolt, and the input of the first comparator 420 generally is the voltage of below 5V, then resistance R40
Resistance can be much larger than the resistance of resistance R41；And if detection control circuit is made in chip internal, then resistance R40
Needing to use high-tension resistive, resistance R41 is low resistance, and the coupling between resistance can be poor, thus affects electricity
The precision of pressure detection.
In consideration of it, as described in Figure 8, another embodiment of the present utility model is at VIN end and sampling resistor R50 and R51
Between seal in transistor.Preferably junction field effect transistor (being called for short JFET), has control and circuit is simple, efficiency
Advantages of higher, as the source voltage of JFET M50, JFET in figure is approximately the VIN terminal voltage folder at JFET
Power-off pressure cuts top.Such as, this JFET pinch-off voltage is 20V, then when VIN terminal voltage is less than 20V, and JFET
Source voltage be essentially VIN；When VIN voltage is more than or equal to 20V, the source voltage of JFET is 20V.Cause
This, can select pinch-off voltage to be higher than the threshold voltage of VIN end, uses identical type and resistance size to be similar to
Resistance, to improve the coupling between resistance, the precision of further booster tension detection.
As a kind of embodiment, delay circuit includes voltage source, current source, resistance, the second comparator, electric capacity
And second control switch；Voltage source passes through resistance eutral grounding, and the size of current source is controlled by the output electric current of voltage source；
The outfan of current source passes through capacity earth；Second comparator, its first input end connects the outfan of current source, the
Two inputs connect the second reference voltage, and outfan connects logic circuit；Switch in parallel with electric capacity, the control end of switch
Connect the outfan of the first comparator.When the termination that controls of switch receives the first comparison signal of the first comparator output
Time, switching off, electric capacity is charged by current source, and when the voltage on electric capacity reaches the second reference voltage, second compares
Device output time delayed signal is to logic circuit.
See Fig. 7 and Fig. 9, in the delay circuit 430 that another embodiment of this utility model provides, resistance can be passed through
R20 regulates delay time.Voltage source V60 is a fixed voltage, its external resistance R20 to ground, current source I60
Being the current source that controls of an electric current, its size is controlled by the electric current i60 of voltage source V60, the size of I60 and i60's
Size is directly proportional.Switch K60 controls the input that end is delay circuit 430, is connected with the first comparator 420,
The outfan of the second comparator connects logic circuit 440.
When the output end voltage of input voltage sample circuit 410 is less than or equal to the first reference voltage VREF1, the
One comparator 420 exports the second comparison signal, and now second controls switch K60 conducting, and the second comparator U60 is defeated
Go out for just.
When the output end voltage of input voltage sample circuit 410 is more than the first reference voltage VREF1, first compares
Device 420 upset output the second comparison signal, switch K60 turns off, and the current source I60 that electric current controls is to electric capacity C60
Charging, when on electric capacity C60, voltage reaches the second reference voltage VREF2, the output switching activity of the second comparator U60,
From just becoming 0, logic circuit 440 is arrived in output, makes the first control switch conduction of outside.Therefore, it can by setting
Put the size of resistance R20 to regulate delay time.Resistance R20 is the biggest, then time delay is the longest；Resistance R20 is the least,
Then time delay is the shortest.
Correspondingly, this utility model embodiment additionally provides a kind of LED drive circuit, including controllable silicon dimmer 100,
Rectifier bridge 200, filter circuit and LED driver 300, also include the buffer circuit that above-described embodiment is recorded, tool
Body structure sees Fig. 5, the most no longer redundant later.
Utilize the LED drive circuit that the present embodiment provides, it is possible to achieve when surge current occurs preferably to circuit
The surge current of middle generation buffers, automatically by buffering device short circuit from input circuit after surge current occurs,
To reduce power consumption, it is greatly improved system work efficiency.
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 (10)
1. a buffer circuit, it is characterised in that include detecting control circuit, the first control switch and damping unit
Part；
Described damping element, is connected in the input circuit after rectification；
Described detection control circuit, is connected with the input circuit after described rectification, obtains the input circuit after described rectification
In input voltage and described input voltage is compared with the threshold voltage preset, when described input voltage is higher than institute
When stating threshold voltage, described detection control circuit time delay exports the first control signal；
Described first controls switch, is connected with described damping element and described detection control circuit respectively, described first control
System switch is short-circuit by described damping element based on described first control signal.
Buffer circuit the most according to claim 1, it is characterised in that the outfan of described detection control circuit
It is connected with the input circuit after described rectification by electric capacity.
Buffer circuit the most according to claim 1, it is characterised in that described first controls to switch as transistor.
4. according to the buffer circuit described in any one of claims 1 to 3, it is characterised in that described detection controls electricity
Road includes input voltage sample circuit, the first comparator, delay circuit, logic circuit and drive circuit；
Described input voltage sample circuit, connects the input circuit after described rectification, samples described input voltage；
Described first comparator, its first input end connects the outfan of described input voltage sample circuit, the second input
End connects the first reference voltage, and outfan is sequentially connected with described delay circuit, logic circuit and drive circuit；
When the sampled voltage that described input voltage sample circuit obtains is higher than described first reference voltage, described first ratio
Relatively device exports the first comparison signal and arrives described logic circuit after described delay circuit time delay, described logic circuit according to
Described first comparison signal exports described first control signal, controls described first and controls switch by short for described damping element
Road.
Buffer circuit the most according to claim 4, it is characterised in that the outfan of described first comparator is also
It is connected with described logic circuit；
When the sampled voltage that described input voltage sample circuit obtains is less than or equal to described first reference voltage, described
First comparator directly exports the second comparison signal to described logic circuit, and described logic circuit compares according to described second
Signal exports the second control signal, controls described first and controls switch OFF, described damping element is cut described rectification
After input circuit in.
Buffer circuit the most according to claim 4, it is characterised in that described input voltage sample circuit includes
First sampling resistor and the second sampling resistor；
Described first sampling resistor is connected with described second sampling resistor, and the first connection end of described first sampling resistor is even
Connecing the input circuit after described rectification, the second connection end of described first sampling resistor is connect by described second sampling resistor
Ground.
Buffer circuit the most according to claim 6, it is characterised in that described input voltage sample circuit also wraps
Include transistor；
Described transistor, its source electrode connects the input circuit after described rectification, the of drain electrode and described first sampling resistor
One connects end connects, and grid connects the earth terminal of described second sampling resistor.
Buffer circuit the most according to claim 4, it is characterised in that described delay circuit include voltage source,
Current source, resistance, the second comparator, electric capacity and second control switch；
Described voltage source passes through described resistance eutral grounding；
The outfan of described current source passes through described capacity earth, and the size of described current source is by the output of described voltage source
Electric current controls；
Described second comparator, its first input end connects the outfan of described current source, and the second input connects second
Reference voltage, outfan connects described logic circuit；
Described switch is in parallel with described electric capacity, and the end that controls of described switch connects the outfan of described first comparator；
When described switch control termination receive described first comparator output described first comparison signal time, described in open
Closing and disconnect, described electric capacity is charged by described current source, when the voltage on described electric capacity reaches described second reference voltage,
Described second comparator output time delayed signal is to described logic circuit.
Buffer circuit the most according to claim 4, it is characterised in that described drive circuit is driven with current sources
Circuit or voltage source drive circuit.
10. a LED drive circuit, drives including controllable silicon dimmer, rectification circuit, filter circuit and LED
Dynamic device, described rectification circuit, filter circuit and LED driver are the most in parallel, constitute input circuit, described tune
Light device is connected on the input of described input circuit, it is characterised in that also include any one of the claims 1 to 8
Described buffer circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620398856.3U CN205622936U (en) | 2016-05-05 | 2016-05-05 | Snubber circuit and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620398856.3U CN205622936U (en) | 2016-05-05 | 2016-05-05 | Snubber circuit and LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205622936U true CN205622936U (en) | 2016-10-05 |
Family
ID=57026606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620398856.3U Active CN205622936U (en) | 2016-05-05 | 2016-05-05 | Snubber circuit and LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205622936U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105873277A (en) * | 2016-05-05 | 2016-08-17 | 杰华特微电子（杭州）有限公司 | Buffer circuit, LED drive circuit and control method thereof |
| 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 |
| CN114364097A (en) * | 2021-09-26 | 2022-04-15 | 杰华特微电子股份有限公司 | Buffer circuit for LED drive circuit, LED drive circuit and control method thereof |
-
2016
- 2016-05-05 CN CN201620398856.3U patent/CN205622936U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105873277A (en) * | 2016-05-05 | 2016-08-17 | 杰华特微电子（杭州）有限公司 | Buffer circuit, LED drive circuit and control method thereof |
| 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 |
| CN114364097A (en) * | 2021-09-26 | 2022-04-15 | 杰华特微电子股份有限公司 | Buffer circuit for LED drive circuit, LED drive circuit and control method thereof |
| CN114364097B (en) * | 2021-09-26 | 2023-10-27 | 杰华特微电子股份有限公司 | Buffer circuit, LED driving circuit and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106027011A (en) | Current detection method based on parasitic inductance and application of current detection method | |
| CN107508473B (en) | Synchronous rectifier converter | |
| CN106793246A (en) | Leadage circuit and its control method and LED control circuit | |
| CN205622936U (en) | Snubber circuit and LED drive circuit | |
| CN104166107B (en) | Demagnetization detection control module and demagnetization detecting system | |
| CN104078925B (en) | Overvoltage protection device | |
| TW201513549A (en) | Load driving circuit and method | |
| CN104093250A (en) | Open circuit over-voltage protection device used for LED drive circuit | |
| CN106656130A (en) | Segmented resistance type IGBT driving circuit and control method thereof | |
| CN103424602A (en) | Secondary winding current detection circuit based on source electrode drive | |
| CN103036196B (en) | Over-pressure safety device and method | |
| CN105873277A (en) | Buffer circuit, LED drive circuit and control method thereof | |
| CN110289841A (en) | A kind of ladder driving circuit | |
| CN203313043U (en) | Negative-voltage drive circuit of high-frequency MOSFET | |
| CN107623512B (en) | Active Miller clamping protection circuit | |
| CN203814013U (en) | LED driving circuit adopting single-end zero crossing detection | |
| CN109450230A (en) | A kind of IGBT gate drivers based on analog circuit | |
| CN209419502U (en) | Power supply circuit, control circuit and Switching Power Supply | |
| CN203339958U (en) | Peak current detection-based line voltage compensation circuit | |
| CN202330630U (en) | Detecting circuit for current and working condition of MOS (Metal Oxide Semiconductor) tube | |
| CN103683239A (en) | Surge protection circuit | |
| CN203967963U (en) | Off-line power supply conversion circuit | |
| CN203747779U (en) | Power tube drive circuit and direct-current solid state power controller | |
| CN109240408A (en) | SiCMOSFET gate drive voltage control circuit and its control method | |
| CN206100533U (en) | Electrified way of high pressure constant current lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |