CN209643048U - A kind of LED drive circuit based on power tube security protection - Google Patents
A kind of LED drive circuit based on power tube security protection Download PDFInfo
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- CN209643048U CN209643048U CN201920093752.5U CN201920093752U CN209643048U CN 209643048 U CN209643048 U CN 209643048U CN 201920093752 U CN201920093752 U CN 201920093752U CN 209643048 U CN209643048 U CN 209643048U
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Abstract
The utility model discloses a kind of LED drive circuits based on power tube security protection, including Ripple Suppression module, Voltage to current transducer module and control module, the input terminal of Ripple Suppression module and one end of control module are all connected with power distribution equipment bus, Ripple Suppression module and load parallel connection；Voltage to current transducer module includes amplifier, power tube and sampling resistor, the output end of amplifier and the grid of power tube connect, the drain electrode of the output end and power tube of Ripple Suppression module connects, the source electrode of power tube is grounded by sampling resistor, the drain electrode of power tube, source electrode, the non-inverting input terminal of amplifier and/or amplifier inverting input terminal connect respectively with control module, the electric current that control module flows through power tube is reduced with the raising of busbar voltage.The utility model designs control module in LED drive circuit, when making power tube drain voltage raising in Voltage to current transducer module, the current reduction of drain electrode is flowed through, to guarantee the area of safety operaton of power tube.
Description
Technical field
The utility model relates to field of LED drive, in particular to a kind of LED based on power tube security protection drives electricity
Road.
Background technique
LED is as a kind of efficient new light sources, and due to long with the service life, low energy consumption, energy conservation and environmental protection, is just being widely used in each
Field illumination.In LED drive circuit, the Voltage to current transducer module formed using amplifier, power tube is important core.
In the prior art, LED drive circuit is as shown in Figure 1, busbar voltage or power tube drain after rectification are electric
When pressing through high, power tube drain current rises therewith, causes to generate integrity problem beyond power tube trouble free service section.
Power tube drain current when in the prior art for busbar voltage or excessively high power tube drain voltage lacks control
The phenomenon that system, power tube is burnt, occurs again and again.
Utility model content
In order to overcome the shortcomings of the prior art, the utility model provides a kind of based on power tube security protection
LED drive circuit designs control module in LED drive circuit, makes power tube drain voltage liter in Voltage to current transducer module
Gao Shi flows through the current reduction of drain electrode, to guarantee the area of safety operaton of power tube.
The technical solution is as follows:
The utility model provides a kind of LED drive circuit based on power tube security protection, including Ripple Suppression module,
Voltage to current transducer module and control module, the input terminal of the Ripple Suppression module and one end of control module are all connected with distribution
Device bus, the Ripple Suppression module and load parallel connection；
The Voltage to current transducer module includes amplifier, power tube and sampling resistor, the output end of the amplifier with
The grid of the power tube connects, and the output end of the Ripple Suppression module is connect with the drain electrode of the power tube, the power
The source electrode of pipe is grounded by the sampling resistor, the drain electrode of the power tube, source electrode, amplifier non-inverting input terminal and/or put
The inverting input terminal of big device is connect with the control module respectively, the control module flow through the electric current of the power tube with
The raising of busbar voltage and reduce.
About the specific implementation of control module, there are at least following five kinds of modes:
Mode one, the control module include first resistor, second resistance and 3rd resistor, and the first resistor setting exists
Between the power distribution equipment bus and the inverting input terminal of the amplifier；
The second resistance and 3rd resistor are connected in parallel on the both ends of the power tube after being connected in series, the 3rd resistor
One end is connect with the sampling resistor；
The intermediate connecting pin of the second resistance and 3rd resistor is connect with the inverting input terminal of the amplifier, described to put
The non-inverting input terminal of big device connects the first reference voltage.
Mode two, the control module include the first trsanscondutance amplifier, the first constant-current source, ground capacity, the 4th resistance and
5th resistance, the output end of first constant-current source, the output end of the first trsanscondutance amplifier, ground capacity anode with it is described
The non-inverting input terminal of amplifier connects；
4th resistance and the 5th resistance are connected in parallel on the both ends of the power tube after being connected in series, first mutual conductance is put
Input terminal, the 5th resistance of big device are connect with the intermediate connecting pin of the power tube, sampling resistor, the 4th resistance and the
The intermediate connecting pin of five resistance is connect with the inverting input terminal of the amplifier.
Mode three, the control module include the 6th resistance and the 7th resistance, and the 6th resistance and the 7th resistance are connected
The both ends of the power tube are connected in parallel on after connection, the intermediate connecting pin and the amplifier of the 6th resistance and the 7th resistance
The non-inverting input terminal of inverting input terminal connection, the amplifier connects the second reference voltage.
Mode four, the control module include the second trsanscondutance amplifier, the second constant-current source, ground resistance, the 8th resistance and
9th resistance, the output end of second constant-current source, the output end of the second trsanscondutance amplifier, ground resistance one end with it is described
The non-inverting input terminal of amplifier connects, the other end ground connection of the ground resistance；
The intermediate connecting pin of the power tube and sampling resistor is connect with the inverting input terminal of the amplifier；
One end of 8th resistance is connect with power distribution equipment bus, and the other end is connect with one end of the 9th resistance, described
The other end of 9th resistance is grounded, the intermediate connecting pin and second trsanscondutance amplifier of the 8th resistance and the 9th resistance
The inverting input terminal of non-inverting input terminal connection, second trsanscondutance amplifier connects third reference voltage.
Mode five, the control module include the tenth resistance, and the tenth resistance is in parallel with the power tube, the amplification
The non-inverting input terminal of device connects the 4th reference voltage, the intermediate connecting pin and the amplifier of the power tube and sampling resistor
Inverting input terminal connection.
About the specific implementation of Ripple Suppression module, there is at least following two mode:
Mode one, the Ripple Suppression module include first capacitor, anode and the power distribution equipment bus of the first capacitor
Connection, the cathode of the first capacitor and the input terminal of power tube connect, and the load is connected in parallel on the first capacitor both ends.
Mode two, the Ripple Suppression module include the second capacitor, third capacitor, divider resistance, third constant-current source and the
The anode of two power tubes, second capacitor is connect with power distribution equipment bus, the load and divider resistance, third constant current subject string
Connection forms branch, and the branch is in parallel with second capacitor, and the third capacitor is in parallel with the third constant-current source, and described the
At the both ends of the divider resistance and third constant-current source, the divider resistance and third are permanent for the drain electrode of two power tubes and sources connected in parallel
The intermediate connecting pin in stream source is connect with the grid of second power tube.
Technical solution bring provided by the utility model has the beneficial effect that:
1) busbar voltage after rectification or when excessively high power tube drain voltage, control module control power tube current with
The raising of input voltage or drain voltage and gradually decrease, to guarantee power tube work in safety operation area, stability is high；
2) busbar voltage and drain voltage can individually control power tube current work in safety operation area, can also be with one
Control power tube current work is played in safety operation area；
3) Ripple Suppression module is filtered modulated power tube current, reduces load blocks ripple factor.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of LED drive circuit in the prior art；
Fig. 2 is the topological structure of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection
Schematic diagram；
Fig. 3 is the first reality of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection
Apply circuit diagram；
Fig. 4 is that second of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection is real
Apply circuit diagram；
Fig. 5 is the third reality of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection
Apply circuit diagram；
Fig. 6 is the 4th kind of reality of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection
Apply circuit diagram；
Fig. 7 is the 5th kind of reality of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection
Apply circuit diagram；
Fig. 8 is the work wave of the LED drive circuit provided by the embodiment of the utility model based on power tube security protection
Figure.
Wherein, appended drawing reference includes: 1- Ripple Suppression module, 111- first capacitor, the second capacitor of 121-, 122- third electricity
Hold, 123- divider resistance, 124- third constant-current source, the second power tube of 125-, 2- Voltage to current transducer module, 21- amplifier,
22- power tube, 23- sampling resistor, 3- control module, 311- first resistor, 312- second resistance, 313- 3rd resistor, 321-
First trsanscondutance amplifier, the first constant-current source of 322-, 323- ground capacity, the 4th resistance of 324-, the 5th resistance of 325-, 331- the 6th
Resistance, the 7th resistance of 332-, the second trsanscondutance amplifier of 341-, the second constant-current source of 342-, 343- ground resistance, the 8th electricity of 344-
Resistance, the 9th resistance of 345-, the tenth resistance of 351-, 4- load.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model a part, instead of all the embodiments.Based on the reality in the utility model
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts is all answered
When the range for belonging to the utility model protection.
It should be noted that the specification and claims of the utility model and term " first " in above-mentioned attached drawing,
" second " etc. is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that in this way
The data used are interchangeable under appropriate circumstances, so that the embodiments of the present invention described herein can be in addition at this
In illustrate or description those of other than sequence implement.In addition, term " includes " and " having " and their any deformation, meaning
Figure, which is to cover, non-exclusive includes.
The utility model provides a kind of LED drive circuit based on power tube security protection, as shown in Fig. 2, the drive
Dynamic circuit includes Ripple Suppression module 1, Voltage to current transducer module 2 and control module 3, the input of the Ripple Suppression module 1
End and one end of control module 3 are all connected with power distribution equipment bus, and the Ripple Suppression module 1 is connected in parallel with load 4；
The Voltage to current transducer module 2 includes amplifier 21, power tube 22 and sampling resistor 23, the amplifier 21
Output end is connect with the grid of the power tube 22, the drain electrode of the output end of the Ripple Suppression module 1 and the power tube 22
The source electrode of connection, the power tube 22 is grounded by the sampling resistor 23, the drain electrode of the power tube 22, source electrode, amplifier
21 non-inverting input terminal and/or the inverting input terminal of amplifier 21 are connect with the control module 3 respectively, the control module 3
The electric current for flowing through the power tube 22 is reduced with the raising of busbar voltage.
About the specific implementation of control module 3, the utility model provides following several embodiments:
Embodiment 1
In one embodiment of the utility model, a kind of LED drive circuit based on power tube security protection is provided,
As shown in figure 3, the Ripple Suppression module 1 of driving circuit includes first capacitor 111, the anode and distribution of the first capacitor 111
The connection of device bus, the cathode of the first capacitor 111 are connect with the input terminal of power tube 22, and the load 4 is connected in parallel on described
111 both ends of first capacitor, the first capacitor 111 inhibit the current ripples of load blocks.
The control module 3 of the driving circuit is (following including first resistor 311 (can claim R11 below), second resistance 312
Can claim R12) and 3rd resistor 313 (R10 can be claimed below), the setting of first resistor 311 is in the power distribution equipment bus and institute
Between the inverting input terminal for stating amplifier 21；The second resistance 312 and 3rd resistor 313 are connected in parallel on the function after being connected in series
The both ends of rate pipe 22, one end of the 3rd resistor 313 are connect with the sampling resistor 23 (claiming R1s in embodiment 1)；Described
Two resistance 312 are connect with the intermediate connecting pin of 3rd resistor 313 with the inverting input terminal of the amplifier 21, the amplifier 21
Non-inverting input terminal connect the first reference voltage Vref1。
Power tube transient current in the driving circuit of embodiment 1 is increased with drain voltage or busbar voltage below and is reduced
It is verified: for the circuit in Fig. 3, when meeting R11 > > R10 > > R1s and R12 > > R10 > > R1s, power tube transient current
Meet following formula:
Ip=[Vref1-(Vbus/R11+Vp/ R12) * R10]/R1s, wherein IpFor power tube transient current, VbusFor bus
Voltage, VpFor power tube drain voltage, Vref1For the reference voltage of amplifier non-inverting input terminal connection；
It is clear that with VbusAnd VpGradually increase, IpIt is gradually reduced, by VbusAnd VpCommon modulation, IpIn safe work
Make within area.
Above-mentioned " > > " it is to be indicated much larger than symbol, for example calculate a+b, if a > > b, calculated to simplify, not
The presence of b can be ignored in accurate read group total, and the identification condition of a > > b generally can be set to big two orders of magnitude of a ratio b
Or more." > > " in several embodiments similarly, repeats no more below.
Embodiment 2
In one embodiment of the utility model, a kind of LED drive circuit based on power tube security protection is provided,
As shown in figure 4, the Ripple Suppression module 1 of driving circuit includes first capacitor 111, the anode and distribution of the first capacitor 111
The connection of device bus, the cathode of the first capacitor 111 are connect with the input terminal of power tube 22, and the load 4 is connected in parallel on described
111 both ends of first capacitor, the first capacitor 111 inhibit the current ripples of load blocks.
The control module 3 of the driving circuit includes the first trsanscondutance amplifier 321, the first constant-current source 322, ground capacity
323, the 4th resistance 324 (R21 can be claimed below) and the 5th resistance 325 (R20 can be claimed below), first constant-current source 322 it is defeated
Outlet, the output end of the first trsanscondutance amplifier 321, ground capacity 323 non-inverting input terminal of the anode with the amplifier 21
Connection；
4th resistance 324 and the 5th resistance 325 are connected in parallel on the both ends of the power tube 22 after being connected in series, and described the
Input terminal, the 5th resistance 325 of one trsanscondutance amplifier 321 (claim with the power tube 22, sampling resistor 23 in embodiment 2
R2s intermediate connecting pin connection), the intermediate connecting pin and the amplifier 21 of the 4th resistance 324 and the 5th resistance 325
Inverting input terminal connection.
Power tube transient current in the driving circuit of embodiment 2 is increased with drain voltage or busbar voltage below and is reduced
Verified: for the circuit in Fig. 4, when meeting R21 > > R20 > > R2s, power tube average current meets following formula:
Ip_average=Iref/ (R2s*Gm2), wherein Ip_averageFor power tube average current, IrefFor the first constant-current source
Reference current, Gm2 are the transadmittance gain of the first trsanscondutance amplifier；
Power tube transient current meets following formula:
Ip=(Vc-Vp/ R21*R20)/R2s, wherein IpFor power tube transient current, VcFor the output electricity of the first constant-current source
Pressure, VpFor power tube drain voltage；
It is clear that with VpGradually increase IpInstantaneous value is gradually reduced, IpBy VpIt is modulated in safety operation area, but
It is IpAverage value it is constant.
Embodiment 3
In one embodiment of the utility model, a kind of LED drive circuit based on power tube security protection is provided,
As shown in figure 5, the Ripple Suppression module 1 of driving circuit include including the second capacitor 121, third capacitor 122, divider resistance 123,
The anode of third constant-current source 124 and the second power tube 125, second capacitor 121 is connect with power distribution equipment bus, the load
4 connect to form branch with divider resistance 123, third constant-current source 124, and the branch is in parallel with second capacitor 121, and described
Three capacitors 122 are in parallel with the third constant-current source 124, and the drain electrode of second power tube 125 and sources connected in parallel are in the partial pressure
The both ends of resistance 123 and third constant-current source 124, the intermediate connecting pin of the divider resistance 123 and third constant-current source 124 with it is described
The grid of second power tube 125 connects, and the Ripple Suppression module 1 inhibits the current ripples of load blocks.
The control module 3 of the driving circuit includes that the 6th resistance 331 (can claim R31 below) and the 7th resistance 332 are (following
Can claim R30), the 6th resistance 331 and the 7th resistance 332 are connected in parallel on the both ends of the power tube 22 after being connected in series, described
6th resistance 331 is connect with the intermediate connecting pin of the 7th resistance 332 with the inverting input terminal of the amplifier 21, the amplifier
21 non-inverting input terminal connects the second reference voltage Vref2, in embodiment 3, the sampling resistor 23 is R3s.
Power tube transient current in the driving circuit of embodiment 3 is increased with drain voltage or busbar voltage below and is reduced
Verified: for the circuit in Fig. 5, when meeting R31 > > R30 > > R3s, power tube transient current meets following formula:
Ip=(Vref-Vp/ R31*R30)/R3s, wherein IpFor power tube transient current, Vref2For amplifier homophase input
Hold the reference voltage of connection, VpFor power tube drain voltage；
It is clear that with VpGradually increase IpInstantaneous value is gradually reduced, IpBy VpIt is modulated in safety operation area.
Embodiment 4
In one embodiment of the utility model, a kind of LED drive circuit based on power tube security protection is provided,
As shown in fig. 6, the Ripple Suppression module 1 of driving circuit include including the second capacitor 121, third capacitor 122, divider resistance 123,
The anode of third constant-current source 124 and the second power tube 125, second capacitor 121 is connect with power distribution equipment bus, the load
4 connect to form branch with divider resistance 123, third constant-current source 124, and the branch is in parallel with second capacitor 121, and described
Three capacitors 122 are in parallel with the third constant-current source 124, and the drain electrode of second power tube 125 and sources connected in parallel are in the partial pressure
The both ends of resistance 123 and third constant-current source 124, the intermediate connecting pin of the divider resistance 123 and third constant-current source 124 with it is described
The grid of second power tube 125 connects, and the Ripple Suppression module 1 inhibits the current ripples of load blocks.
The control module 3 of the driving circuit includes the second trsanscondutance amplifier 341, the second constant-current source 342, ground resistance
343, the 8th resistance 344 and the 9th resistance 345, the output end of second constant-current source 342, the second trsanscondutance amplifier 341 it is defeated
Outlet, ground resistance 343 one end connect with the non-inverting input terminal of the amplifier 21, the ground resistance 343 it is another
End ground connection；
The power tube 22 is connect with the intermediate connecting pin of sampling resistor 23 with the inverting input terminal of the amplifier 21；
One end of 8th resistance 344 (can claim R41 below) is connect with power distribution equipment bus, the other end and the 9th resistance
345 one end connection, the other end ground connection of the 9th resistance 345 (R40 can be claimed below), the 8th resistance 344 and the 9th
The intermediate connecting pin of resistance 345 is connect with the non-inverting input terminal of second trsanscondutance amplifier 341, second trsanscondutance amplifier
341 inverting input terminal connects third reference voltage Vref3。
Power tube transient current in the driving circuit of embodiment 4 is increased with drain voltage or busbar voltage below and is reduced
Verified: for the circuit in Fig. 6, when meeting R41 > > R40, power tube transient current meets following formula:
Work as Vbus/R41*R40-Vref3When >=0,
Ip=[Iref-(Vbus/R41*R40-Vref3) * Gm4] * R4c/R4s, wherein IpFor power tube transient current, VbusFor
Busbar voltage, Vref3For the reference voltage that the inverting input terminal of the second trsanscondutance amplifier connects, IrefFor the benchmark of the second constant-current source
Electric current, Gm4 are the transadmittance gain of the second trsanscondutance amplifier；
Work as Vbus/R41*R40-VrefWhen < 0,
Ip=Iref*R4c/R4s
It is clear that with VbusGradually increase IpInstantaneous value is gradually reduced, IpBy VbusIt is modulated in safety operation area.
Embodiment 5
In one embodiment of the utility model, a kind of LED drive circuit based on power tube security protection is provided,
As shown in fig. 7, the Ripple Suppression module 1 of driving circuit includes first capacitor 111, the anode and distribution of the first capacitor 111
The connection of device bus, the cathode of the first capacitor 111 are connect with the input terminal of power tube 22, and the load 4 is connected in parallel on described
111 both ends of first capacitor, the first capacitor 111 inhibit the current ripples of load blocks.
The control module 3 of the driving circuit includes the tenth resistance 351 (can claim R5 below), the tenth resistance 351 with
The power tube 22 is in parallel, and the non-inverting input terminal of the amplifier 21 connects the 4th reference voltage Vref4, the power tube 22 with
The intermediate connecting pin of sampling resistor 23 is connect with the inverting input terminal of the amplifier 21.
Power tube transient current in the driving circuit of embodiment 5 is increased with drain voltage or busbar voltage below and is reduced
Verified: for the circuit in Fig. 7, when meeting R5 > > R5s, power tube transient current meets following formula:
Ip=Vref4/R5s-Vp/ R5, wherein IpFor power tube transient current, VpFor power tube drain voltage, Vref4To put
The reference voltage of big device non-inverting input terminal connection.
It is clear that with VpGradually increase IpInstantaneous value is gradually reduced, IpBy VpIt is modulated in safety operation area.
The work wave such as Fig. 8 institute for the LED drive circuit based on power tube security protection that above embodiments 1-5 is provided
Show, it can be seen that the control module in the LED drive circuit of the utility model can control power tube drain current IpWith mother
Line voltage VbusOr drain voltage VpRaising and reduce, make power tube work in safety zone.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (8)
1. a kind of LED drive circuit based on power tube security protection, which is characterized in that including Ripple Suppression module (1), voltage
Current conversion module (2) and control module (3), the input terminal of the Ripple Suppression module (1) and one end of control module (3) are equal
Power distribution equipment bus is connected, the Ripple Suppression module (1) is connected in parallel with load (4)；
The Voltage to current transducer module (2) includes amplifier (21), power tube (22) and sampling resistor (23), the amplifier
(21) output end is connect with the grid of the power tube (22), the output end and the power of the Ripple Suppression module (1)
The drain electrode connection of (22) is managed, the source electrode of the power tube (22) is grounded by the sampling resistor (23), the power tube (22)
Drain electrode, source electrode, the non-inverting input terminal of amplifier (21) and/or amplifier (21) inverting input terminal respectively with the control mould
Block (3) connection, the electric current that the control module (3) flows through the power tube (22) are reduced with the raising of busbar voltage.
2. driving circuit according to claim 1, which is characterized in that the control module (3) includes first resistor
(311), second resistance (312) and 3rd resistor (313), the first resistor (311) setting the power distribution equipment bus with
Between the inverting input terminal of the amplifier (21)；
The second resistance (312) and 3rd resistor (313) are connected in parallel on the both ends of the power tube (22) after being connected in series, described
One end of 3rd resistor (313) is connect with the sampling resistor (23)；
The inverting input terminal of the intermediate connecting pin and the amplifier (21) of the second resistance (312) and 3rd resistor (313)
The non-inverting input terminal of connection, the amplifier (21) connects the first reference voltage.
3. driving circuit according to claim 1, which is characterized in that the control module (3) is amplified including the first mutual conductance
Device (321), the first constant-current source (322), ground capacity (323), the 4th resistance (324) and the 5th resistance (325), described first is permanent
The output end in stream source (322), the output end of the first trsanscondutance amplifier (321), ground capacity (323) anode with the amplification
The non-inverting input terminal of device (21) connects；
4th resistance (324) and the 5th resistance (325) are connected in parallel on the both ends of the power tube (22) after being connected in series, described
The input terminal of first trsanscondutance amplifier (321), the 5th resistance (325) are and in the power tube (22), sampling resistor (23)
Between connecting pin connect, the intermediate connecting pin of the 4th resistance (324) and the 5th resistance (325) is anti-with the amplifier (21)
The connection of phase input terminal.
4. driving circuit according to claim 1, which is characterized in that the control module (3) includes the 6th resistance (331)
With the 7th resistance (332), the power tube is connected in parallel on after the 6th resistance (331) and the series connection of the 7th resistance (332)
(22) the intermediate connecting pin of both ends, the 6th resistance (331) and the 7th resistance (332) and the reverse phase of the amplifier (21)
The non-inverting input terminal of input terminal connection, the amplifier (21) connects the second reference voltage.
5. driving circuit according to claim 1, which is characterized in that the control module (3) is amplified including the second mutual conductance
Device (341), the second constant-current source (342), ground resistance (343), the 8th resistance (344) and the 9th resistance (345), described second is permanent
The output end in stream source (342), the output end of the second trsanscondutance amplifier (341), ground resistance (343) one end with the amplification
The non-inverting input terminal of device (21) connects, the other end ground connection of the ground resistance (343)；
The power tube (22) connect with the intermediate connecting pin of sampling resistor (23) with the inverting input terminal of the amplifier (21)；
One end of 8th resistance (344) is connect with power distribution equipment bus, and one end of the other end and the 9th resistance (345) connects
It connects, the other end ground connection of the 9th resistance (345), the intermediate connecting pin of the 8th resistance (344) and the 9th resistance (345)
It is connect with the non-inverting input terminal of second trsanscondutance amplifier (341), the inverting input terminal of second trsanscondutance amplifier (341)
Connect third reference voltage.
6. driving circuit according to claim 1, which is characterized in that the control module (3) includes the tenth resistance
(351), the tenth resistance (351) is in parallel with the power tube (22), the non-inverting input terminal of the amplifier (21) connection the
Four reference voltages, the anti-phase input of the intermediate connecting pin and the amplifier (21) of the power tube (22) and sampling resistor (23)
End connection.
7. driving circuit according to claim 1, which is characterized in that the Ripple Suppression module (1) includes first capacitor
(111), the anode of the first capacitor (111) is connect with power distribution equipment bus, the cathode and power of the first capacitor (111)
The input terminal connection of (22) is managed, the load (4) is connected in parallel on the first capacitor (111) both ends.
8. driving circuit according to claim 1, which is characterized in that the Ripple Suppression module (1) includes the second capacitor
(121), third capacitor (122), divider resistance (123), third constant-current source (124) and the second power tube (125), second electricity
The anode for holding (121) is connect with power distribution equipment bus, and the load (4) and divider resistance (123), third constant-current source (124) are gone here and there
Connection forms branch, and the branch is in parallel with the second capacitor (121), the third capacitor (122) and the third constant-current source
(124) in parallel, the drain electrode of second power tube (125) and sources connected in parallel are in the divider resistance (123) and third constant-current source
(124) both ends, the intermediate connecting pin and second power tube of the divider resistance (123) and third constant-current source (124)
(125) grid connection.
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| CN201920093752.5U CN209643048U (en) | 2019-01-21 | 2019-01-21 | A kind of LED drive circuit based on power tube security protection |
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| CN109618466A (en) * | 2019-01-21 | 2019-04-12 | 苏州菲达旭微电子有限公司 | A kind of LED drive circuit based on power tube security protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109618466A (en) * | 2019-01-21 | 2019-04-12 | 苏州菲达旭微电子有限公司 | A kind of LED drive circuit based on power tube security protection |
| CN109618466B (en) * | 2019-01-21 | 2024-02-20 | 广东基地灯饰有限公司 | LED drive circuit based on power tube safety protection |
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