CN103917016A - High-voltage linear power current compensating circuit - Google Patents
High-voltage linear power current compensating circuit Download PDFInfo
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- CN103917016A CN103917016A CN201410083803.8A CN201410083803A CN103917016A CN 103917016 A CN103917016 A CN 103917016A CN 201410083803 A CN201410083803 A CN 201410083803A CN 103917016 A CN103917016 A CN 103917016A
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Abstract
The invention provides a high-voltage linear power current compensating circuit. The high-voltage linear power current compensating circuit comprises a voltage sampling module and a current compensation module. One end of the voltage sampling module is connected with a drive switch which is located in a high-voltage linear circuit and used for controlling a certain section of an LED lamp string to be turned on or turned off, and the voltage sampling module is used for collecting the voltage of the drive switch. One end of the current compensation module is connected with the other end of the voltage sampling module, and the other end of the current compensation module is connected with the inverted input end of a comparator for controlling the turn-on time of the drive switch. The current compensation module is used for adjusting the voltage of the inverted input end of the comparator and then adjusting the breakover current of each section of the LED lamp string according to the voltage output by the comparator so that the output power of the LED lamp string can keep steady. The high-voltage linear power current compensating circuit enables the power of the LED lamp strings to keep steady through the current compensation module, so that the comfort level of a user is improved, and the high-voltage linear power current compensating circuit is a product which is quite practical and easy to popularize energetically, produce and use.
Description
Technical field
The present invention relates to light-emitting diode (Light Emitting Diode, hereinafter to be referred as: LED) lighting technical field, relates in particular to a kind of high-voltage linear power current compensation circuit.
Background technology
The problem that high-voltage linear product ubiquity power output changes with input voltage in the market, as: input voltage 220Vac increases 1O% to 242Vac, power output can increase 16% left and right, and the result causing is like this that the brightness of LED lamp has significant change.Concrete reason is: electric current, voltage and the waveform of time when accompanying drawing 1 is normally worked for LED in linear low density LED circuit, as shown in Figure 1, when the input voltage waveform of high-voltage linear circuit is shown in U1 time, the On current waveform of the LED lamp string of its inner access (has accessed 3 sections of LED lamp strings) as shown in I1 in figure in this figure mesohigh linear circuit; In the time that the input voltage of high-voltage linear circuit is elevated to as shown in U2 in figure, the On current waveform of the LED lamp string of its inner access is just as shown in I2 in figure; Due to the power output P=(U of LED
1i
1t
1+ U
2i
2t
2+ U
3i
3t
3)/T, wherein, U
1for conducting voltage, the I of first paragraph LED
1for On current, the T of first paragraph LED lamp string are that cycle, three are definite value, and T
1for I
1the time of constant current, U
2i
2t
2, U
3i
3t
3in like manner; The waveform showing according to Fig. 1 is visible, and after voltage raises, the time of LED constant current also just increases thereupon, especially the ON time of the 3rd section of LED lamp string (the constant current time T of first paragraph LED lamp string that rises appreciably
1, second segment LED lamp string constant current time T
2slightly reduce, negligible), known according to the computing formula of power, the power output P of LED also can increase thereupon, and the power of LED also just obviously increases, user will feel that the brightness of LED lamp has significant change, thereby affects user's comfort level.
Summary of the invention
The object of the invention is to solve the defect that above-mentioned prior art exists, provide a kind of LED lamp string power that can make to access in high-voltage linear circuit to change and maintain power compensating circuit stably.
A kind of high-voltage linear power current compensation circuit, comprises voltage sample module, current compensation module.
Described voltage sample module one end with in high-voltage linear circuit, control the conducting of certain section of LED lamp string and be connected with the driving switch of shutoff, for gathering the voltage of this driving switch.
Described current compensation module one end is connected with the voltage sample module other end, the current compensation module other end is connected with the comparator inverting input of controlling driving switch ON time, for regulating the size of comparator anti-phase input terminal voltage, and then regulate the size of the On current of every section of LED lamp string according to the size of comparator output voltage, thereby make the power output of LED lamp string remain steady.
Further, high-voltage linear power current compensation circuit as above, described driving switch is metal-oxide-semiconductor.
Further, described voltage sample module comprises: comparator AR6, resistance R 12, capacitor C 1; The in-phase input end of described comparator AR6 is connected with reference voltage, and the metal-oxide-semiconductor Q2 grid of the latter end LED lamp string of its inverting input and control in access high-voltage linear circuit is connected; The output of described comparator AR6 is connected with one end of resistance R 12, and the other end of resistance R 12 is connected with one end of capacitor C 1, the other end ground connection of capacitor C 1;
Described current compensation module comprises NMOS pipe Q9, PMOS pipe Q7, PMOS pipe Q8; The grid of described NMOS pipe Q9 is connected with the tie point of resistance R 12 and capacitor C 1, NMOS manages Q9 source ground, drain electrode is connected with the source electrode of PMOS pipe Q7; The drain electrode of PMOS pipe Q7 is connected with the drain electrode of PMOS pipe Q8; PMOS manages the grid of Q8 and the grid of PMOS pipe Q7 is connected with the drain electrode of NMOS pipe Q9 jointly, the source electrode of PMOS pipe Q8 is connected with comparator AR1 inverting input, and described comparator AR1 is used for the ON time of the metal-oxide-semiconductor of first section of LED lamp string controlling access high-voltage linear circuit.
Further, also comprise the signal processing module being connected between voltage sample module and current compensation module; Described signal processing module is used for the voltage held stationary that voltage sample module is collected and supplies with current compensation module; Described signal processing module comprises voltage follower AR7 and resistance R 13, the in-phase input end of described voltage follower AR7 is connected with the tie point of resistance R 12 and capacitor C 1, the output of voltage follower AR7 is connected with one end of resistance R 13, and the other end of resistance R 13 is connected with the grid of NMOS pipe Q9.
Further, described voltage sample module comprises resistance R 11, resistance R 12, diode D1, diode D2, capacitor C 1; One end of described resistance R 11 is connected with the drain electrode of the metal-oxide-semiconductor Q5 of the first section of LED lamp string of control in access high-voltage linear circuit, its other end is connected with the positive pole of diode D1 and diode D2 respectively, the negative pole of diode D2 is connected with one end of resistance R 12, the tie point common ground of the other end of resistance R 12 and capacitor C 1 one end;
Described current compensation module comprises NMOS pipe Q7, PMOS pipe Q8, PMOS pipe Q9; Described NMOS manages the grid of Q7 and the negative pole of diode D2 is connected with the tie point of capacitor C 1 other end, NMOS manages Q7 source ground, drain electrode is connected with the source electrode of PMOS pipe Q8; The drain electrode of PMOS pipe Q8 is connected with the drain electrode of PMOS pipe Q9; PMOS manages the grid of Q9 and the grid of PMOS pipe Q8 is connected with the drain electrode of NMOS pipe Q7 jointly, the source electrode of PMOS pipe Q9 is connected with comparator AR1 inverting input, and described comparator AR1 is used for the ON time of the metal-oxide-semiconductor of first section of LED lamp string controlling access high-voltage linear circuit.
Further, also comprise the signal processing module being connected between voltage sample module and current compensation module; Described signal processing module is used for the voltage held stationary that voltage sample module is collected and supplies with current compensation module; Described signal processing module comprises voltage follower AR5 and resistance R 13, the in-phase input end of described voltage follower AR5 is connected with the tie point of capacitor C 1 other end with diode D1 negative pole, the output of voltage follower AR5 is connected with one end of resistance R 13, and the other end of resistance R 13 is connected with the grid of NMOS pipe Q7.
High-voltage linear power current compensation circuit provided by the invention, the voltage of the driving switch by voltage acquisition module collection control LED lamp string, and then control the size of current of LED lamp string according to the voltage collecting, thereby control the power of LED lamp string according to the size of current of LED lamp string, make the power of LED lamp string remain steady, thereby having improved user's comfort level, is a kind of very practical, product of being easy to widely popularize production and application.
Accompanying drawing explanation
Fig. 1 be in high-voltage linear circuit LED lamp string in one-period electric current with the oscillogram of change in voltage;
Fig. 2 is the principle assumption diagram after high-voltage linear power current compensation circuit access high-voltage linear circuit of the present invention;
Fig. 3 is high-voltage linear power current compensation circuit grid voltage sample circuit structure chart one of the present invention;
Fig. 4 is high-voltage linear power current compensation circuit grid voltage sample circuit structure chart two of the present invention;
Fig. 5 is high-voltage linear power current compensation circuit drain voltage sample circuit structure chart one of the present invention;
Fig. 6 is high-voltage linear power current compensation circuit drain voltage sample circuit structure chart two of the present invention;
Fig. 7 is that high-voltage linear power current compensation circuit of the present invention accesses the pin connection structure figure after high line linear circuit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawing in the present invention, technical scheme in the present invention is clearly and completely described, and obvious described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 2 is that high-voltage linear power current compensation circuit of the present invention accesses the principle assumption diagram after high line linear circuit, and as shown in Figure 2, high-voltage linear power current compensation circuit provided by the invention, comprises voltage sample module, current compensation module; Described voltage sample module one end with in high-voltage linear circuit, control the conducting of certain section of LED lamp string and be connected with the driving switch of shutoff, for gathering the voltage of this driving switch; Described current compensation module one end is connected with the voltage sample module other end, the current compensation module other end is connected with the comparator inverting input of controlling driving switch ON time, for regulating the size of comparator anti-phase input terminal voltage, and then regulate the size of the On current of every section of LED lamp string according to the size of comparator output voltage, thereby make the power output of LED lamp string remain steady.
Particularly, as shown in Figure 2, the positive pole of rectifier bridge has connected 3 sections of LED lamp strings, the 3rd section of LED lamp string that be respectively the first paragraph LED lamp string being formed by D1 and D2, the second segment LED lamp string being formed by D3, is formed by D4, wherein, the driving switch of control first paragraph LED lamp string conducting and shutoff is metal-oxide-semiconductor Q6; The driving switch of controlling second segment LED lamp string conducting and shutoff is metal-oxide-semiconductor Q4; The driving switch of controlling the 3rd section of LED lamp string conducting and shutoff is metal-oxide-semiconductor Q2; Comparator AR3 is for controlling the ON time of metal-oxide-semiconductor Q2; Comparator AR2 is for controlling the ON time of metal-oxide-semiconductor Q4; Comparator AR1 is for controlling the ON time of metal-oxide-semiconductor Q6.According to the description of background technology, after input voltage in high-voltage linear circuit raises, the constant current time of accessing the LED lamp string of its circuit can increase, thereby cause the power of LED lamp string to have significant change, and in order to reduce the phenomenon of this LED lamp string power significant change, the utility model is by taking in the time that voltage rising causes the constant current time to increase, and the On current that reduces LED is means, thereby reaches the object of the LED power variation held stationary making in high-voltage linear circuit; Otherwise, in the time that the input voltage of high line linear circuit reduces, be means by the On current that increases LED, thereby reach the object of the LED power variation held stationary making in high-voltage linear circuit.Particularly, voltage sample module gathers the voltage of driving switch metal-oxide-semiconductor Q2, current compensation module is controlled the size of its output current according to the voltage of voltage sample module output, because current compensation module one end is connected with the inverting input of comparator, the output current variation of current compensation module changes the voltage that causes comparator inverting input, and because the voltage reference of comparator in-phase input end is constant, therefore, the size of comparator output voltage is just decided by the voltage swing of its inverting input, and the output voltage of working as comparator changes, the metal-oxide-semiconductor grid voltage being connected with comparator output terminal will change, and the change of metal-oxide-semiconductor grid voltage will cause the size of corresponding LED lamp string stream to change, the size of LED lamp string stream changes and just can control the variation of LED power.Object of the present invention is exactly in the time that the input voltage of rectifier bridge increases, and by the effect of voltage sample module and current compensation module, finally makes the electric current of LED lamp string reduce, according to the computing formula P=(U of LED power
1i
1t
1+ U
2i
2t
2+ U
3i
3t
3)/T, while increase due to input voltage, T3 increases, and I
1, I
2, I
3can relatively reduce, so, the power of LED be fluctuateed in a very little scope, and can also not increase along with the power of the increase LED of input terminal voltage thereupon, make the power of LED remain steady; Otherwise, in the time that the input voltage of rectifier bridge reduces, by the control of voltage sample module and current compensation module, finally make the electric current of LED lamp string increase, thereby the power of LED fluctuateed in a very little scope.Described driving switch can be PMOS pipe, NMOS pipe, PNP pipe, NPN pipe, and the present invention adopts metal-oxide-semiconductor as driving switch.
Fig. 3 is high-voltage linear power current compensation circuit grid voltage sample circuit structure chart one of the present invention; Fig. 4 is high-voltage linear power current compensation circuit grid voltage sample circuit structure chart two of the present invention; Fig. 5 is high-voltage linear power current compensation circuit drain voltage sample circuit structure chart one of the present invention; Fig. 6 is high-voltage linear power current compensation circuit drain voltage sample circuit structure chart two of the present invention; Fig. 7 is that high-voltage linear power current compensation circuit of the present invention accesses the pin connection structure figure after high line linear circuit, and table one is that Fig. 3, Fig. 4, Fig. 5, Fig. 6 connect corresponding table with the pin of Fig. 7 respectively:
Table one:
Embodiment 1:
Fig. 3 is high-voltage linear power current compensation circuit grid voltage sample circuit structure chart one of the present invention, as shown in Figure 3, the present embodiment provides a kind of power compensating circuit of metal-oxide-semiconductor grid voltage sampling, and described voltage sample module comprises: comparator AR6, resistance R 12, capacitor C 1; The in-phase input end of described comparator AR6 is connected with reference voltage, and the metal-oxide-semiconductor Q2 grid of the latter end LED lamp string of its inverting input and control in access high-voltage linear circuit is connected; The output of described comparator AR6 is connected with one end of resistance R 12, and the other end of resistance R 12 is connected with one end of capacitor C 1, the other end ground connection of capacitor C 1;
Particularly, the inverting input of comparator AR6 is connected with the grid of metal-oxide-semiconductor Q2, and capacitor C 1 is carried out the charge and discharge of self by the variation of metal-oxide-semiconductor Q2 grid voltage, thereby provides input voltage for current compensation module; In the time that rectifier bridge input voltage raises, capacitor C 1 voltage raises, otherwise reduces.
Described current compensation module comprises NMOS pipe Q9, PMOS pipe Q7, PMOS pipe Q8; The grid of described NMOS pipe Q9 is connected with the tie point of resistance R 12 and capacitor C 1, NMOS manages Q9 source ground, drain electrode is connected with the source electrode of PMOS pipe Q7; The drain electrode of PMOS pipe Q7 is connected with the drain electrode of PMOS pipe Q8; PMOS manages the grid of Q8 and the grid of PMOS pipe Q7 is connected with the drain electrode of NMOS pipe Q9 jointly, the source electrode of PMOS pipe Q8 is connected with comparator AR1 inverting input, and described comparator AR1 is used for the ON time of the metal-oxide-semiconductor of first section of LED lamp string controlling access high-voltage linear circuit.
Particularly, the current compensation module of the present embodiment, in the time that the grid voltage of NMOS pipe Q9 raises, the electric current of the source electrode of PMOS pipe Q8 just increases, due to the effect of resistance R 5 and resistance R EXT, the voltage of comparator AR1 inverting input just raises, because the in-phase input end voltage of comparator AR1 is constant, therefore, the output voltage of comparator AR1 will reduce, the lower voltage of metal-oxide-semiconductor Q6 grid, the conduction impedance of metal-oxide-semiconductor Q6 raises, and its output current will reduce; Otherwise in the time that the grid voltage of NMOS pipe Q9 reduces, the output current of metal-oxide-semiconductor Q6 will increase.
In sum, in the time that rectifier bridge input voltage raises, capacitor C 1 voltage raises, and the grid voltage of NMOS pipe Q9 raises, and the output current of metal-oxide-semiconductor Q6 will reduce so; Otherwise, in the time that rectifier bridge input voltage reduces, capacitor C 1 lower voltage, the source voltage of NMOS pipe Q9 reduces, and the output current of metal-oxide-semiconductor Q6 will increase so.Thereby, according to the power output P=(U of LED
1i
1t
1+ U
2i
2t
2+ U
3i
3t
3)/T, in the case of the input voltage at rectifier bridge two ends increases, the electric current of LED lamp string will correspondingly reduce, and the power output of LED is fluctuateed among a small circle, remains steady thereby guaranteed to make LED lamp string power to change.
Embodiment 2:
Further, on the basis of Fig. 3 embodiment, the present invention also comprises the signal processing module being connected between voltage sample module and current compensation module; Described signal processing module is used for the voltage held stationary that voltage sample module is collected and supplies with current compensation module.Fig. 4 is high-voltage linear power current compensation circuit grid voltage sample circuit structure chart two of the present invention, as shown in Figure 4, described signal processing module comprises voltage follower AR7 and resistance R 13, the in-phase input end of described voltage follower AR7 is connected with the tie point of resistance R 12 and capacitor C 1, the output of voltage follower AR7 is connected with one end of resistance R 13, and the other end of resistance R 13 is connected with the source electrode of NMOS pipe Q9.
Embodiment 3:
Fig. 5 is high-voltage linear power current compensation circuit drain voltage sample circuit structure chart one of the present invention.The present embodiment carries out electric current by the voltage of collection metal-oxide-semiconductor drain electrode and supplements, thereby makes the power of LED lamp string remain steady.
As shown in Figure 5, described voltage sample module comprises resistance R 11, resistance R 12, diode D1, diode D2, capacitor C 1; One end of described resistance R 11 is connected with the drain electrode of the metal-oxide-semiconductor Q5 of the first section of LED lamp string of control in access high-voltage linear circuit, its other end is connected with the positive pole of diode D1 and diode D2 respectively, the negative pole of diode D2 is connected with one end of resistance R 12, the tie point common ground of the other end of resistance R 12 and capacitor C 1 one end.
The voltage sample module that the present embodiment provides, in the time that the input voltage of rectifier bridge raises, in voltage sample module the charging interval of capacitor C 1 just longer, thereby the voltage of capacitor C 1 is also just higher, therefore, the voltage of NMOS pipe Q7 grid is also just higher.
Described current compensation module comprises NMOS pipe Q7, PMOS pipe Q8, PMOS pipe Q9; Described NMOS manages the grid of Q7 and the negative pole of diode D2 is connected with the tie point of capacitor C 1 other end, NMOS manages Q7 source ground, drain electrode is connected with the source electrode of PMOS pipe Q8; The drain electrode of PMOS pipe Q8 is connected with the drain electrode of PMOS pipe Q9; PMOS manages the grid of Q9 and the grid of PMOS pipe Q8 is connected with the drain electrode of NMOS pipe Q7 jointly, the source electrode of PMOS pipe Q9 is connected with comparator AR1 inverting input, and described comparator AR1 is used for the ON time of the metal-oxide-semiconductor of first section of LED lamp string controlling access high-voltage linear circuit.
In the present embodiment, current compensation module is identical with the current compensation modular structure in embodiment 1,2, and function is identical, does not repeat them here.
Embodiment 4:
The present embodiment, on the basis of embodiment 3, also comprises the signal processing module being connected between voltage sample module and current compensation module; Described signal processing module is used for the voltage held stationary that voltage sample module is collected and supplies with current compensation module; Fig. 6 is high-voltage linear power current compensation circuit drain voltage sample circuit structure chart two of the present invention, as shown in Figure 6, described signal processing module comprises voltage follower AR5 and resistance R 13, the in-phase input end of described voltage follower AR5 is connected with the tie point of capacitor C 1 other end with diode D1 negative pole, the output of voltage follower AR5 is connected with one end of resistance R 13, and the other end of resistance R 13 is connected with the grid of NMOS pipe Q7.
High-voltage linear power current compensation circuit provided by the invention, the voltage of the driving switch by voltage acquisition module collection control LED lamp string, again the voltage collecting is processed by signal processing module, be processed into the spendable voltage of current compensation module, finally by current compensation module, the power of LED lamp string is maintained steadily, thereby improved user's comfort level.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a high-voltage linear power current compensation circuit, is characterized in that, comprises voltage sample module, current compensation module;
Described voltage sample module one end with in high-voltage linear circuit, control the conducting of certain section of LED lamp string and be connected with the driving switch of shutoff, for gathering the voltage of this driving switch;
Described current compensation module one end is connected with the voltage sample module other end, the other end is connected with the comparator inverting input of control driving switch ON time, for regulating the size of comparator anti-phase input terminal voltage, and then regulate the On current size of every section of LED lamp string according to the size of comparator output voltage, thereby make the power output of LED lamp string remain steady.
2. high-voltage linear power current compensation circuit according to claim 1, is characterized in that, described driving switch is metal-oxide-semiconductor.
3. high-voltage linear power current compensation circuit according to claim 2, is characterized in that, described voltage sample module comprises: comparator AR6, resistance R 12, capacitor C 1; The in-phase input end of described comparator AR6 is connected with reference voltage, and the metal-oxide-semiconductor Q2 grid of the latter end LED lamp string of its inverting input and control in access high-voltage linear circuit is connected; The output of described comparator AR6 is connected with one end of resistance R 12, and the other end of resistance R 12 is connected with one end of capacitor C 1, the other end ground connection of capacitor C 1;
Described current compensation module comprises NMOS pipe Q9, PMOS pipe Q7, PMOS pipe Q8; The grid of described NMOS pipe Q9 is connected with the tie point of resistance R 12 and capacitor C 1, NMOS manages Q9 source ground, drain electrode is connected with the source electrode of PMOS pipe Q7; The drain electrode of PMOS pipe Q7 is connected with the drain electrode of PMOS pipe Q8; PMOS manages the grid of Q8 and the grid of PMOS pipe Q7 is connected with the drain electrode of NMOS pipe Q9 jointly, the source electrode of PMOS pipe Q8 is connected with comparator AR1 inverting input, and described comparator AR1 is used for the ON time of the metal-oxide-semiconductor of first section of LED lamp string controlling access high-voltage linear circuit.
4. high-voltage linear power current compensation circuit according to claim 3, is characterized in that, also comprises the signal processing module being connected between voltage sample module and current compensation module; Described signal processing module is used for the voltage held stationary that voltage sample module is collected and supplies with current compensation module; Described signal processing module comprises voltage follower AR7 and resistance R 13, the in-phase input end of described voltage follower AR7 is connected with the tie point of resistance R 12 and capacitor C 1, the output of voltage follower AR7 is connected with one end of resistance R 13, the other end of resistance R 13 and NMOS pipe Q9 grid be connected.
5. high-voltage linear power current compensation circuit according to claim 2, is characterized in that, described voltage sample module comprises resistance R 11, resistance R 12, diode D1, diode D2, capacitor C 1; One end of described resistance R 11 is connected with the drain electrode of the metal-oxide-semiconductor Q5 of the first section of LED lamp string of control in access high-voltage linear circuit, its other end is connected with the positive pole of diode D1 and diode D2 respectively, the negative pole of diode D2 is connected with one end of resistance R 12, the tie point common ground of the other end of resistance R 12 and capacitor C 1 one end;
Described current compensation module comprises NMOS pipe Q7, PMOS pipe Q8, PMOS pipe Q9; Described NMOS manages the grid of Q7 and the negative pole of diode D2 is connected with the tie point of capacitor C 1 other end, NMOS manages Q7 source ground, drain electrode is connected with the source electrode of PMOS pipe Q8; The drain electrode of PMOS pipe Q8 is connected with the drain electrode of PMOS pipe Q9; PMOS manages the grid of Q9 and the grid of PMOS pipe Q8 is connected with the drain electrode of NMOS pipe Q7 jointly, the source electrode of PMOS pipe Q9 is connected with comparator AR1 inverting input, and described comparator AR1 is used for the ON time of the metal-oxide-semiconductor of first section of LED lamp string controlling access high-voltage linear circuit.
6. high-voltage linear power current compensation circuit according to claim 5, is characterized in that, also comprises the signal processing module being connected between voltage sample module and current compensation module; Described signal processing module is used for the voltage held stationary that voltage sample module is collected and supplies with current compensation module; Described signal processing module comprises voltage follower AR5 and resistance R 13, the in-phase input end of described voltage follower AR5 is connected with the tie point of capacitor C 1 other end with diode D1 negative pole, the output of voltage follower AR5 is connected with one end of resistance R 13, and the other end of resistance R 13 is connected with the grid of NMOS pipe Q7.
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| CN112188684A (en) * | 2020-09-29 | 2021-01-05 | 深圳市晟碟半导体有限公司 | Constant-current LED driving circuit, device and driving method thereof |
| CN112188684B (en) * | 2020-09-29 | 2022-10-28 | 深圳市晟碟半导体有限公司 | Constant-current LED driving circuit, device and driving method thereof |
| CN114698189A (en) * | 2020-12-31 | 2022-07-01 | 杰华特微电子股份有限公司 | Multi-segment linear LED driving circuit |
| CN114698189B (en) * | 2020-12-31 | 2024-08-23 | 杰华特微电子股份有限公司 | Multi-section linear LED driving circuit |
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