CN207150902U - A kind of LED drive circuit of compatible tape light switch - Google Patents
A kind of LED drive circuit of compatible tape light switch Download PDFInfo
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- CN207150902U CN207150902U CN201720989400.9U CN201720989400U CN207150902U CN 207150902 U CN207150902 U CN 207150902U CN 201720989400 U CN201720989400 U CN 201720989400U CN 207150902 U CN207150902 U CN 207150902U
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- power supply
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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]
Abstract
The utility model provides a kind of LED drive circuit of compatible tape light switch, including drive circuit body and control circuit, control circuit include：First switch pipe；Internal high pressure power supply module, the source of input termination first switch pipe, output end are grounded by external capacitive；Voltage sample module, reference voltage generation module, internal electric source generation module and supply voltage detection module, the output end of their input termination internal high pressure power supply module；Comparator, power supply terminate the output end of internal electric source generation module, the output end of control termination supply voltage detection module, and positive input terminates the output end of reference voltage generation module, and negative input terminates the output end of voltage sample module, earth terminal ground connection；Power output pipe, grid connect the output end of comparator, and drain electrode connects the output end of first switch pipe, source ground.This circuit is able to ensure that the brightness stability of indicator lamp when indicator light switch disconnects, while ensures that LED is loaded when control circuit is not actuated is in OFF state.
Description
Technical field
It the utility model is related to field of LED drive, more particularly to a kind of LED drive circuit of compatible tape light switch.
Background technology
In actual life, switch is found at night in order to facilitate people, some switches just carry functions of indicator light, are switching
During disconnection, indicator lamp glimmer, when the switch is closed, indicator lamp goes out.Tape light switch simple equivalent circuit as shown in figure 1,
When switching Sw disconnections, indicator lamp equivalent resistance Req is directly connected with circuit below, and faint electric current is had on equivalent resistance
Flow through；When switching Sw conductings, equivalent resistance Req is short-circuited, and is not had electric current and is flowed through equivalent resistance.
LED drive circuit such as Fig. 2 of existing tape light switch, it is the typical application circuit of existing BUCK circuits.Should
Circuit includes rectifier bridge, input capacitance Cin, load LED lamp pearl, the fictitious load R1 being made up of diode D1~D4, output capacitance
Cout, inductance L, sustained diode 5, sampling resistor Rcs, controller and power MOS pipe Q1.Wherein, the hv terminations of controller
Inductance L, sampling end cs meet sampling resistor Rcs, vcc termination Cvcc, gate and terminate Q1 grid.Power supply module inside controller
Powered by hv ends to controller and Cvcc.
As shown in Fig. 2 inside controller, Hv termination technotrons jfet drain terminal, due to jfet pinch off electricity
Press and follow the increase of drain terminal voltage for a bigger value (such as 18V), this source voltage terminal for allowing for jfet and increase, until
Source voltage reaches jfet pinch-off voltage.Internal high voltage supply module is exactly to add control pipe to be supplied to VCC from jfet source
Electricity.When VCC voltages are less than the VCC lower voltage limits of controller inner setting, jfet sources charge to VCC, when VCC voltages reach
During the upper limit of the VCC voltages of controller inner setting, supply access of the jfet sources to VCC is disconnected.
When hv terminal voltages are sufficiently large, the high voltage supply module inside controller starts to charge to Cvcc, until VCC voltages
Reach the startup voltage of controller, controller is started working.Due in input and being connected to bulky capacitor Cin, disconnected in switch sw
When, input line voltage Vin is charged by equivalent resistance Req to electric capacity Cin, and the voltage on electric capacity Cin becomes larger, and works as electric capacity
Voltage on Cin is big to a certain extent, starts to power to controller.When the VCC voltages of controller, which reach it, starts voltage, control
Device processed starts normal work, and the electric current of normal work is bigger with respect to starting current, and input capacitance Cin can be caused to discharge rapidly,
Input capacitance Cin voltages, which reduce, causes the pressure difference at equivalent resistance Req both ends to become big, and electric current becomes big.
Input capacitance Cin voltage reduction is eventually resulted in controller and is stopped again due to electricity shortage, is stopped
Input line voltage continues through equivalent resistance Req and charged to input capacitance after work, and the rise of input capacitance Cin voltages causes
Effect resistance both ends pressure difference diminishes, and electric current diminishes.The brightness that such a cycle may result in switch indication light periodically becomes
Change.Because controller is periodically stopped, it is possible to cause load LED lamp periodic flicker.
To sum up, existing LED drive circuit can not compatible tape light switch, controller and tape light switch work together
The problem of indicator lamp or load LED flickers often occurs, which limits the application of LED drive circuit.
Utility model content
For above-mentioned the deficiencies in the prior art, the utility model provides a kind of LED driving electricity of compatible tape light switch
Road, when the control circuit in the circuit works together with indicator light switch, it can be ensured that indicator lamp when indicator light switch disconnects
Brightness stability, while ensure that LED is loaded when control circuit is not actuated is constantly in OFF state.
To achieve these goals, the utility model adopts the following technical scheme that：
A kind of LED drive circuit of compatible tape light switch, the circuit include drive circuit body and control circuit, institute
Stating control circuit includes：
First switch pipe, the drain electrode of the first switch pipe connect the drive circuit body, grounded-grid；
Internal high pressure power supply module, the input of the internal high pressure power supply module terminate the source of the first switch pipe,
Output end is grounded by an external capacitive；
Voltage sample module, reference voltage generation module, internal electric source generation module and supply voltage detection module, it is described
Voltage sample module, reference voltage generation module, the input of internal electric source generation module and supply voltage detection module connect
The output end of the internal high pressure power supply module；
Comparator, the power supply of the comparator terminate the output end of the internal electric source generation module, control described in termination
The output end of supply voltage detection module, positive input terminate the output end of the reference voltage generation module, negative input termination institute
State the output end of voltage sample module, earth terminal ground connection；And
Power output pipe, the grid of the power output pipe connect the output end of the comparator, and drain electrode connects described first and opened
Close the output end of pipe, source ground.
Further, the drive circuit body include indicator lamp, indicator light switch pipe, rectification circuit, input capacitance and
DCDC modules, wherein,
The indicator lamp and indicator light switch are connected in parallel between the positive input terminal of a positive power source terminal and the rectification circuit；
The negative input of the rectification circuit terminates a negative power end, and positive output terminates the positive terminal of the input capacitance, bears
Output head grounding and the negative pole end for connecing the input capacitance；
The positive input of the DCDC modules terminates the positive output end of the rectification circuit, and negative input terminates the first switch
The drain electrode of pipe.
Further, the rectifier bridge is connected by the first diode, the second diode, the 3rd diode, the 4th diode
The bridge rectifier connect.
Further, the DCDC modules include：
One the 5th diode, its negative pole end are the positive input terminal of the DCDC modules, and positive terminal is the DCDC modules
Negative input end；
One inductance, one terminate the positive terminal of the 5th diode；
One output capacitance, its positive pole terminate the negative pole end of the 5th diode, and negative pole terminates the other end of the inductance.
Preferably, the voltage sample module includes：
First resistor, its one end are the output end of the voltage sample module, and the other end is the voltage sample module
Output end；And
Second resistance, one terminate the other end of the first resistor, other end ground connection.
Preferably, the internal high pressure power supply module includes：
3rd resistor, its one end are the input of the internal high pressure power supply module；
Second switch pipe, it, which drains, connects one end of the 3rd resistor, and grid connects the other end of the 3rd resistor；
One the 6th diode, its positive pole terminate the source electrode of the second switch pipe, and negative pole end is powered for the internal high pressure
The output end of module.
Compared with prior art, the utility model has the advantages that：
The utility model in the startup stage of control circuit by controlling the electric current to be charged to external capacitive to avoid indicating
Lamp or the flicker for loading LED, in startup stage, if it is indicated that lamp switch disconnects, now first switch pipe fills to external capacitive
The electric current of electricity is smaller, and the positive feedback loop being made up of comparator and power output pipe set inside control circuit will power supply electricity
Pressure is locked in than relatively low state, so that the supply voltage of controller is not up to the startup voltage of control circuit, control
Circuit does not work all the time；If it is indicated that lamp switch is switched to conducting state from off-state, the now first switch of control circuit
The electric current of pipe external capacitive charging is bigger, interrupts the lock-out state in internal positive feedback loop, supply voltage can rise to control
The startup voltage of device processed, controller can be with normal works；In addition, in controller normal operating conditions, positive feedback loop is interrupted,
Avoid impacting the normal work of controller.
Brief description of the drawings
Fig. 1 is the equivalent circuit of tape light switch；
Fig. 2 is the circuit diagram for the LED drive circuit that prior art has tape light switch；
Fig. 3 is the circuit diagram of the LED drive circuit of the utility model compatibility tape light switch；
Fig. 4 is the electrifying timing sequence figure of key node in Fig. 3.
Embodiment
The above-mentioned and/or additional aspect of the utility model and advantage from the following description of the accompanying drawings of embodiments will
Become obvious and be readily appreciated that.
Fig. 3 shows a kind of one embodiment of the LED drive circuit of compatible tape light switch of the utility model, its by
Drive circuit body and control circuit are formed.
In the present embodiment, drive circuit body includes：Indicator lamp equivalent resistance Req, indicator light switch pipe Sw, rectified current
Road, input capacitance Cin, DCDC module and fictitious load.Wherein, rectifier bridge is by the first diode D1, the second diode D2, the 3rd
The bridge rectifier that diode D3, the 4th diode D4 are formed by connecting；DCDC modules be by the 5th diode D5, inductance L and
The typical BULK circuits that output capacitance Cout is formed.Annexation between each element of drive circuit body is as follows：Indicator lamp Req
And indicator light switch Sw is connected in parallel between a positive power source terminal and the positive input terminal of rectification circuit；The negative input termination one of rectification circuit
Negative power end, positive output termination input capacitance Cin positive terminal, negative output terminal are grounded and connect input capacitance Cin negative pole end；The
Five diode D5 positive terminal connection control circuit, negative pole terminate the positive output end of rectification circuit；Inductance L the five or two pole of termination
Pipe D5 positive terminal；Output capacitance Cout positive pole terminates the 5th diode D5 negative pole end, and negative pole termination inductance L's is another
End；Fictitious load Ro and load LED is connected in parallel on output capacitance Cout both ends.
In the present embodiment, control circuit includes：First switch pipe jfet, first switch pipe jfet drain electrode pass through hv
Port connects the positive terminal of the 5th diode D5 in drive circuit body, grounded-grid；Internal high pressure power supply module, the internal high pressure
The input termination first switch pipe jfet of power supply module source electrode, output end are grounded by an external capacitive Cvcc；Voltage sample
Module, reference voltage generation module Reference, internal electric source generation module LDO and supply voltage detection module vcc_det,
The voltage sample module, reference voltage generation module Reference, internal electric source generation module LDO and supply voltage detection mould
Block vcc_det input connects the output end of internal high pressure power supply module；Comparator CMP, the comparator CMP power supply termination
Internal electric source generation module LDO output end, control termination supply voltage detection module vcc_det output end, positive input terminal
Reference voltage generation module Reference output end is connect, negative input terminates the output end of voltage sample module, ground connection termination
Ground；And power output pipe M1, the power output pipe M1 grid connect comparator CMP output end, drain electrode connects first switch pipe
Jfet output end, source ground.
Referring again to Fig. 3, voltage sample module includes first resistor R1 and second resistance R2, and first resistor R1 one end is
The output end of voltage sample module, the other end are the output end of voltage sample module, and the one of second resistance R2 terminates first resistor
The R1 other end, other end ground connection；Internal high pressure power supply module includes：3rd resistor R3, its one end are internal high pressure power supply mould
The input of block；Second switch pipe M0, it, which drains, connects 3rd resistor R3 one end, and grid connects the 3rd resistor R3 other end；One
6th diode D6, its positive pole termination second switch pipe M0 source electrode, negative pole end is the output end of internal high pressure power supply module.
The operation principle of the LED drive circuit of the utility model compatibility tape light switch is as follows：
As shown in figure 3, jfet drain electrode connects hv ports, grounded-grid, when drain electrode is high pressure, jfet source voltage connects
Nearly jfet pinch-off voltage, is a higher voltage；The internal high pressure power supply module being made up of M0, R3 and D6 is to Cvcc
Power supply, produce supply voltage VCC required during control circuit normal work.
When indicator light switch Sw is turned on, equivalent resistance Req is short-circuited, and input voltage charges directly to input capacitance Cin,
Cin voltages become larger, and cause jfet drain electrode hv voltages also to become larger.Due to jfet grounded-grid, jfet is led all the time
Logical, high voltage supply module starts to charge to Cvcc, and VCC voltages become larger, and as the change of VCC voltages is big, Reference's is defeated
Go out voltage Vref also to gradually build up, vcc_det also begins to work, produces output voltage Uvlo.The partial pressure Vcc_div of VCC voltages,
Vdd, Vref, comparator CMP output voltage cpo timing diagram it is as shown in Figure 4.
At the t1 moment, VCC is begun to ramp up, while Vcc_div also begins to rise；T2 moment, internal electric source generation module LDO
Caused builtin voltage Vdd is begun setting up；At the t3 moment, internal Vref is established, and begins with Vref at the moment>Vcc_
Div, now Vdd is also during foundation, so the output voltage cpo of comparator follows Vdd to be gradually increasing；Until the t4 moment,
Vdd is established and finished, and the output voltage cpo of comparator also reaches maximum；At the t5 moment, Vcc_div voltage becomes larger, and opens
There is Vcc_div beginning>Vref, the output cpo of comparator overturn as 0 again.
In whole power up, the output voltage cpo of comparator follows Vdd within t3~t5 periods；Due to comparing
Device CMP and power output tube M1 grid, which is joined directly together, to be connect, and can make it that M1 is turned within this period, so as to the source to jfet
Pole carries out sourcing current.
When normally upper electric, because the voltage of jfet drain electrodes is high pressure, input capacitance Cin directly receives input by rectifier bridge
Voltage so that jfet power supply capacity Ichg is stronger always；Power output tube M1 sourcing current ability Ipull is at the t4 moment
Vdd is established reaches maximum Ipull_max when finishing, and has Ichg>Ipull_max, it is ensured that on control circuit VCC can continue
Rise, due to M1 drawing electricity control circuit will not be caused to start；After control circuit starts, vcc_det output voltage
The output voltage cpo of Uvlo control comparators is always low level, it is ensured that power output pipe M1 is no longer to jfet source electrode sourcing currents.
When indicator light switch Sw disconnects, equivalent resistance Req is in series with circuit below, and now, input voltage vin passes through
Equivalent resistance Req charges to input capacitance Cin, and the voltage on Cin becomes larger, and causes the voltage that jfet drains to become larger,
Jfet starts to charge to Cvcc；Until being begun setting up in the output voltage cpo at t3 moment, comparator and following internal electric source Vdd
Voltage becomes larger；Within t3~t4 periods, as comparator output voltage cpo value becomes larger, power output pipe M1
Sourcing current ability also become larger, because the power supply capacity when power supply capacity Ichg1 ratios of jfet now are normally upper electric is weak,
Jfet sources through high voltage startup to Vcc_div, then through comparator CMP, power output pipe M1 form positive feedback loop can be in
Latch mode, for a long time from the point of view of have Ipull=Ichg；This voltage for allowing for VCC will not rise to the startup electricity of control circuit
Pressure, so as to which control circuit can't start and cause indicator light switch or load LED flicker.
And when indicator light switch turns on, Jfet power supply capacities become big, and latch mode is broken, and is avoided to control circuit
Normal work impacts.
It can be seen that in the utility model, when control circuit works together with indicator light switch, it can be ensured that indicator lamp is referring to
Show brightness stability when lamp switch disconnects, while ensure that load LED is constantly in OFF state when control circuit is not actuated.
Moreover, it should be understood that the circuit shown in Fig. 3 is the example of BUCK DC-DC drive circuits, the utility model institute
The improvement of work is same effective in the DC-DC circuit of other topological structures.
It is above-described, only it is some embodiments of the present utility model, it is noted that for the common of the art
For technical staff, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improvement
The scope of protection of the utility model is also should be regarded as with retouching.
Claims (6)
1. a kind of LED drive circuit of compatible tape light switch, the circuit include drive circuit body and control circuit, it is special
Sign is that the control circuit includes：
First switch pipe, the drain electrode of the first switch pipe connect the drive circuit body, grounded-grid；
Internal high pressure power supply module, the input of the internal high pressure power supply module terminate the source of the first switch pipe, output
End is grounded by an external capacitive；
Voltage sample module, reference voltage generation module, internal electric source generation module and supply voltage detection module, the voltage
Sampling module, reference voltage generation module, the input of internal electric source generation module and supply voltage detection module connect described
The output end of internal high pressure power supply module；
Comparator, the power supply of the comparator terminate the output end of the internal electric source generation module, and control terminates the power supply
The output end of voltage detection module, positive input terminate the output end of the reference voltage generation module, and negative input terminates the electricity
Press the output end of sampling module, earth terminal ground connection；And
Power output pipe, the grid of the power output pipe connect the output end of the comparator, and drain electrode connects the first switch pipe
Output end, source ground.
2. the LED drive circuit of compatible tape light switch according to claim 1, it is characterised in that the driving electricity
Road body includes indicator lamp, indicator light switch pipe, rectification circuit, input capacitance and DCDC modules, wherein,
The indicator lamp and indicator light switch are connected in parallel between the positive input terminal of a positive power source terminal and the rectification circuit；
The negative input of the rectification circuit terminates a negative power end, and positive output terminates the positive terminal of the input capacitance, negative output
End is grounded and connects the negative pole end of the input capacitance；
The positive input of the DCDC modules terminates the positive output end of the rectification circuit, and negative input terminates the first switch pipe
Drain electrode.
3. the LED drive circuit of compatible tape light switch according to claim 2, it is characterised in that the rectifier bridge
It is the bridge rectifier being formed by connecting by the first diode, the second diode, the 3rd diode, the 4th diode.
4. the LED drive circuit of compatible tape light switch according to claim 2, it is characterised in that the DCDC moulds
Block includes：
5th diode, its negative pole end are the positive input terminal of the DCDC modules, and positive terminal is the negative input of the DCDC modules
End；
Inductance, one terminate the positive terminal of the 5th diode；
Output capacitance, its positive pole terminate the negative pole end of the 5th diode, and negative pole terminates the other end of the inductance.
5. the LED drive circuit of the compatible tape light switch according to any one of claim 1-4, it is characterised in that
The voltage sample module includes：
First resistor, its one end are the output end of the voltage sample module, and the other end is the output of the voltage sample module
End；And
Second resistance, one terminate the other end of the first resistor, other end ground connection.
6. the LED drive circuit of the compatible tape light switch according to any one of claim 1-4, it is characterised in that
The internal high pressure power supply module includes：
3rd resistor, its one end are the input of the internal high pressure power supply module；
Second switch pipe, it, which drains, connects one end of the 3rd resistor, and grid connects the other end of the 3rd resistor；
6th diode, its positive pole terminate the source electrode of the second switch pipe, and negative pole end is the internal high pressure power supply module
Output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720989400.9U CN207150902U (en) | 2017-08-09 | 2017-08-09 | A kind of LED drive circuit of compatible tape light switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720989400.9U CN207150902U (en) | 2017-08-09 | 2017-08-09 | A kind of LED drive circuit of compatible tape light switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207150902U true CN207150902U (en) | 2018-03-27 |
Family
ID=61674739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720989400.9U Withdrawn - After Issue CN207150902U (en) | 2017-08-09 | 2017-08-09 | A kind of LED drive circuit of compatible tape light switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207150902U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107249235A (en) * | 2017-08-09 | 2017-10-13 | 上海灿瑞科技股份有限公司 | A kind of LED drive circuit of compatible tape light switch |
| CN112042276A (en) * | 2018-04-27 | 2020-12-04 | 赤多尼科两合股份有限公司 | Power supply circuit, control method and electronic device |
-
2017
- 2017-08-09 CN CN201720989400.9U patent/CN207150902U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107249235A (en) * | 2017-08-09 | 2017-10-13 | 上海灿瑞科技股份有限公司 | A kind of LED drive circuit of compatible tape light switch |
| CN107249235B (en) * | 2017-08-09 | 2023-09-01 | 上海灿瑞微电子有限公司 | LED drive circuit compatible with indicator light switch |
| CN112042276A (en) * | 2018-04-27 | 2020-12-04 | 赤多尼科两合股份有限公司 | Power supply circuit, control method and electronic device |
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| GR01 | Patent grant | ||
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Granted publication date: 20180327 Effective date of abandoning: 20230901 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180327 Effective date of abandoning: 20230901 |