CN109618466B - LED drive circuit based on power tube safety protection - Google Patents
LED drive circuit based on power tube safety protection Download PDFInfo
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- CN109618466B CN109618466B CN201910053223.7A CN201910053223A CN109618466B CN 109618466 B CN109618466 B CN 109618466B CN 201910053223 A CN201910053223 A CN 201910053223A CN 109618466 B CN109618466 B CN 109618466B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses an LED driving circuit based on power tube safety protection, which comprises a ripple suppression module, a voltage-current conversion module and a control module, wherein the input end of the ripple suppression module and one end of the control module are both connected with a bus of a power distribution device, and the ripple suppression module is connected with a load in parallel; the voltage-current conversion module comprises an amplifier, a power tube and a sampling resistor, wherein the output end of the amplifier is connected with the grid electrode of the power tube, the output end of the ripple suppression module is connected with the drain electrode of the power tube, the source electrode of the power tube is grounded through the sampling resistor, the drain electrode and the source electrode of the power tube, the in-phase input end of the amplifier and/or the anti-phase input end of the amplifier are respectively connected with the control module, and the control module enables the current flowing through the power tube to be reduced along with the rising of the bus voltage. According to the invention, the control module is designed in the LED drive circuit, so that when the voltage of the drain electrode of the power tube in the voltage-current conversion module is increased, the current flowing through the drain electrode is reduced, and the safe working area of the power tube is ensured.
Description
Technical Field
The invention relates to the field of LED driving, in particular to an LED driving circuit based on power tube safety protection.
Background
As a high-efficiency new light source, the LED has long service life, low energy consumption, energy conservation and environmental protection, and is widely applied to illumination in various fields. In the LED driving circuit, a voltage-current conversion module consisting of an amplifier and a power tube is an important core.
In the prior art, as shown in fig. 1, when the rectified bus voltage or the power tube drain voltage is too high, the power tube drain current rises, which leads to exceeding the power tube safe working interval and causes a reliability problem.
In the prior art, the drain current of the power tube is lack of control when the bus voltage or the drain voltage of the power tube is too high, and the phenomenon that the power tube burns out frequently occurs.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an LED driving circuit based on power tube safety protection, wherein a control module is designed in the LED driving circuit, so that when the drain voltage of a power tube in a voltage-current conversion module is increased, the current flowing through the drain is reduced, and the safe working area of the power tube is ensured. The technical scheme is as follows:
the invention provides an LED driving circuit based on power tube safety protection, which comprises a ripple suppression module, a voltage-current conversion module and a control module, wherein the input end of the ripple suppression module and one end of the control module are both connected with a bus of a power distribution device, and the ripple suppression module is connected with a load in parallel;
the voltage-current conversion module comprises an amplifier, a power tube and a sampling resistor, wherein the output end of the amplifier is connected with the grid electrode of the power tube, the output end of the ripple suppression module is connected with the drain electrode of the power tube, the source electrode of the power tube is grounded through the sampling resistor, the drain electrode, the source electrode, the non-inverting input end of the amplifier and/or the inverting input end of the amplifier of the power tube are respectively connected with the control module, and the control module enables the current flowing through the power tube to be reduced along with the rising of the bus voltage.
Regarding the specific implementation of the control module, there are at least the following five ways:
in a first mode, the control module includes a first resistor, a second resistor, and a third resistor, where the first resistor is disposed between the power distribution device bus and the inverting input terminal of the amplifier;
the second resistor and the third resistor are connected in series and then connected in parallel to the two ends of the power tube, and one end of the third resistor is connected with the sampling resistor;
the middle connecting end of the second resistor and the third resistor is connected with the inverting input end of the amplifier, and the non-inverting input end of the amplifier is connected with the first reference voltage.
In a second mode, the control module comprises a first transconductance amplifier, a first constant current source, a grounding capacitor, a fourth resistor and a fifth resistor, wherein the output end of the first constant current source, the output end of the first transconductance amplifier and the positive electrode of the grounding capacitor are all connected with the non-inverting input end of the amplifier;
the fourth resistor and the fifth resistor are connected in series and then connected in parallel to two ends of the power tube, the input end of the first transconductance amplifier and the fifth resistor are both connected with the middle connecting end of the power tube and the sampling resistor, and the middle connecting end of the fourth resistor and the fifth resistor is connected with the inverting input end of the amplifier.
In a third mode, the control module comprises a sixth resistor and a seventh resistor, the sixth resistor and the seventh resistor are connected in series and then connected in parallel to two ends of the power tube, the middle connecting end of the sixth resistor and the seventh resistor is connected with the inverting input end of the amplifier, and the non-inverting input end of the amplifier is connected with the second reference voltage.
In a fourth mode, the control module comprises a second transconductance amplifier, a second constant current source, a grounding resistor, an eighth resistor and a ninth resistor, wherein the output end of the second constant current source, the output end of the second transconductance amplifier and one end of the grounding resistor are connected with the non-inverting input end of the amplifier, and the other end of the grounding resistor is grounded;
the middle connecting end of the power tube and the sampling resistor is connected with the inverting input end of the amplifier;
one end of the eighth resistor is connected with the bus of the power distribution device, the other end of the eighth resistor is connected with one end of the ninth resistor, the other end of the ninth resistor is grounded, the middle connecting end of the eighth resistor and the ninth resistor is connected with the non-inverting input end of the second transconductance amplifier, and the inverting input end of the second transconductance amplifier is connected with the third reference voltage.
In a fifth mode, the control module comprises a tenth resistor, the tenth resistor is connected with the power tube in parallel, the non-inverting input end of the amplifier is connected with a fourth reference voltage, and the middle connecting end of the power tube and the sampling resistor is connected with the inverting input end of the amplifier.
Regarding the specific implementation of the ripple suppression module, there are at least two ways:
in a first mode, the ripple suppression module comprises a first capacitor, the positive electrode of the first capacitor is connected with a bus of the power distribution device, the negative electrode of the first capacitor is connected with the input end of the power tube, and the load is connected in parallel with two ends of the first capacitor.
The second mode, ripple suppression module includes second electric capacity, third electric capacity, divider resistor, third constant current source and second power tube, the positive pole of second electric capacity is connected with distribution device busbar, the load is established ties with divider resistor, third constant current source and is formed the branch road, the branch road with the second electric capacity is parallelly connected, the third electric capacity with the third constant current source is parallelly connected, the drain electrode and the source of second power tube are parallelly connected in divider resistor and the both ends of third constant current source, divider resistor and the intermediate junction of third constant current source with the grid of second power tube is connected.
The technical scheme provided by the invention has the following beneficial effects:
1) When the rectified bus voltage or the power tube drain voltage is too high, the control module controls the power tube current to gradually decrease along with the rising of the input voltage or the drain voltage so as to ensure that the power tube works in a safe working area and has high stability;
2) The bus voltage and the drain voltage can independently control the power tube current to work in a safe working area, and can also control the power tube current to work in the safe working area together;
3) The ripple suppression module filters the modulated power tube current and reduces the ripple coefficient of the load module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art LED driver circuit;
fig. 2 is a schematic diagram of a topology structure of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first implementation circuit of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second implementation circuit of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a third implementation circuit of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a fourth implementation circuit of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a fifth implementation circuit of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention;
fig. 8 is an operation waveform diagram of an LED driving circuit based on power tube safety protection according to an embodiment of the present invention.
Wherein, the reference numerals include: the circuit comprises a 1-ripple suppression module, 111-first capacitors, 121-second capacitors, 122-third capacitors, 123-voltage dividing resistors, 124-third constant current sources, 125-second power tubes, 2-voltage-current conversion modules, 21-amplifiers, 22-power tubes, 23-sampling resistors, 3-control modules, 311-first resistors, 312-second resistors, 313-third resistors, 321-first transconductance amplifiers, 322-first constant current sources, 323-grounding capacitors, 324-fourth resistors, 325-fifth resistors, 331-sixth resistors, 332-seventh resistors, 341-second transconductance amplifiers, 342-second constant current sources, 343-grounding resistors, 344-eighth resistors, 345-ninth resistors, 351-tenth resistors and 4-loads.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The invention provides an LED driving circuit based on power tube safety protection, as shown in figure 2, the driving circuit comprises a ripple suppression module 1, a voltage-current conversion module 2 and a control module 3, wherein the input end of the ripple suppression module 1 and one end of the control module 3 are both connected with a bus of a power distribution device, and the ripple suppression module 1 is connected with a load 4 in parallel;
the voltage-current conversion module 2 comprises an amplifier 21, a power tube 22 and a sampling resistor 23, wherein the output end of the amplifier 21 is connected with the grid electrode of the power tube 22, the output end of the ripple suppression module 1 is connected with the drain electrode of the power tube 22, the source electrode of the power tube 22 is grounded through the sampling resistor 23, the drain electrode, the source electrode of the power tube 22, the non-inverting input end of the amplifier 21 and/or the inverting input end of the amplifier 21 are respectively connected with the control module 3, and the control module 3 enables the current flowing through the power tube 22 to be reduced along with the rising of the bus voltage.
Regarding the specific implementation of the control module 3, the present invention provides several embodiments:
example 1
In one embodiment of the present invention, as shown in fig. 3, an LED driving circuit based on power tube safety protection is provided, a ripple suppression module 1 of the driving circuit includes a first capacitor 111, an anode of the first capacitor 111 is connected with a bus of a power distribution device, a cathode of the first capacitor 111 is connected with an input end of a power tube 22, loads 4 are connected in parallel at two ends of the first capacitor 111, and the first capacitor 111 suppresses current ripple of the load module.
The control module 3 of the driving circuit includes a first resistor 311 (hereinafter, R11), a second resistor 312 (hereinafter, R12) and a third resistor 313 (hereinafter, R10), and the first resistor 311 is disposed between the distribution device bus and the inverting input terminal of the amplifier 21; the second resistor 312 and the third resistor 313 are connected in series and then connected in parallel to two ends of the power tube 22, and one end of the third resistor 313 is connected with the sampling resistor 23 (R1 s in embodiment 1); the intermediate connection end of the second resistor 312 and the third resistor 313 is connected with the inverting input end of the amplifier 21, and the non-inverting input end of the amplifier 21 is connected with the first reference voltage V ref1 。
The following verifies that the instantaneous current of the power transistor in the driving circuit of embodiment 1 decreases with an increase in the drain voltage or bus voltage: for the circuit in fig. 3, when R11> R10> R1s and R12> R10> R1s are satisfied, the power tube instantaneous current satisfies the following equation:
I p ＝[V ref1 -(V bus /R11+V p /R12)*R10]r1s, wherein I p For instantaneous current of power tube, V bus For bus voltage, V p For the drain voltage of the power tube, V ref1 A reference voltage connected to the non-inverting input terminal of the amplifier;
obviously with V bus And V p Gradually increasing, I p Gradually decrease under V bus And V p Co-modulation, I p Within the safe working area.
The above "> >" is much larger than the sign, which means that, for example, a+b is calculated, if a > > b, then in order to simplify the calculation, the presence of b can be ignored in the imprecise summation calculation, and the condition for the identification of a > > b can be set to be generally two orders of magnitude or more larger than b. The following embodiments are the same as the "> >", and will not be described in detail.
Example 2
In one embodiment of the present invention, as shown in fig. 4, an LED driving circuit based on power tube safety protection is provided, a ripple suppression module 1 of the driving circuit includes a first capacitor 111, an anode of the first capacitor 111 is connected with a bus of a power distribution device, a cathode of the first capacitor 111 is connected with an input end of a power tube 22, the load 4 is connected in parallel to two ends of the first capacitor 111, and the first capacitor 111 suppresses current ripple of the load module.
The control module 3 of the driving circuit includes a first transconductance amplifier 321, a first constant current source 322, a ground capacitor 323, a fourth resistor 324 (hereinafter may be referred to as R21) and a fifth resistor 325 (hereinafter may be referred to as R20), where an output end of the first constant current source 322, an output end of the first transconductance amplifier 321, and an anode of the ground capacitor 323 are all connected with a non-inverting input end of the amplifier 21;
the fourth resistor 324 and the fifth resistor 325 are connected in series and then connected in parallel to the two ends of the power tube 22, the input end of the first transconductance amplifier 321 and the fifth resistor 325 are both connected with the intermediate connection end of the power tube 22 and the sampling resistor 23 (R2 s in embodiment 2), and the intermediate connection end of the fourth resistor 324 and the fifth resistor 325 is connected with the inverting input end of the amplifier 21.
The following verifies that the instantaneous current of the power transistor in the driving circuit of example 2 decreases with an increase in the drain voltage or bus voltage: for the circuit in fig. 4, when R21> R20> R2s are satisfied, the power tube average current satisfies the following equation:
I p_average ＝I ref /(R2 s. Times.Gm2), where I p_average For the average current of the power tube, I ref Gm2 is the transconductance gain of the first transconductance amplifier, which is the reference current of the first constant current source;
the instantaneous current of the power tube meets the following formula:
I p ＝(V c -V p r21 is R20)/R2 s, wherein I p For instantaneous current of power tube, V c For the output voltage of the first constant current source, V p The drain voltage of the power tube;
obviously with V p Gradually increasing I of (2) p Instantaneous value gradually decreases, I p Is subjected to V p Modulated in a safe working area, but I p The average value of (2) is unchanged.
Example 3
In an embodiment of the present invention, as shown in fig. 5, an LED driving circuit based on power tube safety protection is provided, a ripple suppression module 1 of the driving circuit includes a second capacitor 121, a third capacitor 122, a voltage dividing resistor 123, a third constant current source 124 and a second power tube 125, where an anode of the second capacitor 121 is connected with a bus of a power distribution device, the load 4 is connected in series with the voltage dividing resistor 123 and the third constant current source 124 to form a branch, the branch is connected in parallel with the second capacitor 121, the third capacitor 122 is connected in parallel with the third constant current source 124, a drain and a source of the second power tube 125 are connected in parallel with two ends of the voltage dividing resistor 123 and the third constant current source 124, and an intermediate connection end of the voltage dividing resistor 123 and the third constant current source 124 is connected with a gate of the second power tube 125, and the ripple suppression module 1 suppresses current ripple of the load module.
The control module 3 of the driving circuit includes a sixth resistor 331 (hereinafter referred to as R31) and a seventh resistor 332 (hereinafter referred to as R30), the sixth resistor 331 and the seventh resistor 332 are connected in series and then connected in parallel to the two ends of the power tube 22, the intermediate connection end of the sixth resistor 331 and the seventh resistor 332 is connected with the inverting input end of the amplifier 21, and the non-inverting input end of the amplifier 21 is connected with the second reference voltage V ref2 In embodiment 3, the sampling resistor 23 is R3s.
The following verifies that the instantaneous current of the power transistor in the driving circuit of example 3 decreases with an increase in the drain voltage or bus voltage: for the circuit in fig. 5, when R31> R30> R3s are satisfied, the power tube instantaneous current satisfies the following equation:
I p ＝(V ref -V p R31R 30/R3 s, wherein I p For instantaneous current of power tube, V ref2 For reference voltage, V, connected to the non-inverting input of the amplifier p The drain voltage of the power tube;
obviously with V p Gradually increasing I of (2) p Instantaneous value gradually decreases, I p Is subjected to V p Modulated within a safe operating zone.
Example 4
In an embodiment of the present invention, as shown in fig. 6, an LED driving circuit based on power tube safety protection is provided, a ripple suppression module 1 of the driving circuit includes a second capacitor 121, a third capacitor 122, a voltage dividing resistor 123, a third constant current source 124 and a second power tube 125, where an anode of the second capacitor 121 is connected with a bus of a power distribution device, the load 4 is connected in series with the voltage dividing resistor 123 and the third constant current source 124 to form a branch, the branch is connected in parallel with the second capacitor 121, the third capacitor 122 is connected in parallel with the third constant current source 124, a drain and a source of the second power tube 125 are connected in parallel with two ends of the voltage dividing resistor 123 and the third constant current source 124, and an intermediate connection end of the voltage dividing resistor 123 and the third constant current source 124 is connected with a gate of the second power tube 125, and the ripple suppression module 1 suppresses current ripple of the load module.
The control module 3 of the driving circuit includes a second transconductance amplifier 341, a second constant current source 342, a grounding resistor 343, an eighth resistor 344, and a ninth resistor 345, where an output end of the second constant current source 342, an output end of the second transconductance amplifier 341, and one end of the grounding resistor 343 are all connected with the non-inverting input end of the amplifier 21, and the other end of the grounding resistor 343 is grounded;
the middle connecting end of the power tube 22 and the sampling resistor 23 is connected with the inverting input end of the amplifier 21;
one end of the eighth resistor 344 (hereinafter, R41) is connected to the bus of the power distribution device, the other end is connected to one end of the ninth resistor 345, the other end of the ninth resistor 345 (hereinafter, R40) is grounded, the intermediate connection ends of the eighth resistor 344 and the ninth resistor 345 are connected to the non-inverting input end of the second transconductance amplifier 341, and the inverting input end of the second transconductance amplifier 341 is connected to the third reference voltage V ref3 。
The following verifies that the instantaneous current of the power transistor in the driving circuit of example 4 decreases with an increase in the drain voltage or bus voltage: for the circuit in fig. 6, when R41> R40 is satisfied, the power tube instantaneous current satisfies the following equation:
when V is bus /R41*R40-V ref3 >When the value of the sum is =0,
I p ＝[I ref -(V bus /R41*R40-V ref3 )*Gm4]* R4c/R4s, wherein I p For instantaneous current of power tube, V bus For bus voltage, V ref3 A reference voltage connected to the inverting input of the second transconductance amplifier, I ref Gm4 is the transconductance gain of the second transconductance amplifier;
when V is bus /R41*R40-V ref <At the time of 0, the temperature of the liquid,
I p ＝I ref *R4c/R4s
obviously with V bus Gradually increasing I of (2) p Instantaneous value gradually decreases, I p Is subjected to V bus Modulated within a safe operating zone.
Example 5
In one embodiment of the present invention, as shown in fig. 7, an LED driving circuit based on power tube safety protection is provided, a ripple suppression module 1 of the driving circuit includes a first capacitor 111, an anode of the first capacitor 111 is connected with a bus of a power distribution device, a cathode of the first capacitor 111 is connected with an input end of a power tube 22, the load 4 is connected in parallel to two ends of the first capacitor 111, and the first capacitor 111 suppresses current ripple of the load module.
The control module 3 of the driving circuit includes a tenth resistor 351 (hereinafter referred to as R5), the tenth resistor 351 is connected in parallel with the power tube 22, and the non-inverting input terminal of the amplifier 21 is connected with a fourth reference voltage V ref4 The middle connection end of the power tube 22 and the sampling resistor 23 is connected with the inverting input end of the amplifier 21.
The following verifies that the instantaneous current of the power transistor in the driving circuit of example 5 decreases with an increase in the drain voltage or bus voltage: for the circuit in fig. 7, when R5> R5s is satisfied, the power tube instantaneous current satisfies the following equation:
I p ＝V ref4 /R5s-V p r5, wherein I p For instantaneous current of power tube, V p For the drain electrode of the power tubePressure V ref4 Is the reference voltage connected to the non-inverting input of the amplifier.
Obviously with V p Gradually increasing I of (2) p Instantaneous value gradually decreases, I p Is subjected to V p Modulated within a safe operating zone.
The working waveforms of the LED driving circuits based on the power tube safety protection provided in the above embodiments 1-5 are shown in FIG. 8, and it can be seen that the control module in the LED driving circuit of the present invention can control the drain current I of the power tube p With bus voltage V bus Or drain voltage V p And the power tube is operated in a safety area by rising and falling.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The LED driving circuit based on the power tube safety protection is characterized by comprising a ripple suppression module (1), a voltage-current conversion module (2) and a control module (3), wherein the input end of the ripple suppression module (1) and one end of the control module (3) are both connected with a bus of a power distribution device, and the ripple suppression module (1) is connected with a load (4) in parallel;
the voltage-current conversion module (2) comprises an amplifier (21), a power tube (22) and a sampling resistor (23), wherein the output end of the amplifier (21) is connected with the grid electrode of the power tube (22), the output end of the ripple suppression module (1) is connected with the drain electrode of the power tube (22), the source electrode of the power tube (22) is grounded through the sampling resistor (23), the drain electrode, the source electrode of the power tube (22), the non-inverting input end of the amplifier (21) and/or the inverting input end of the amplifier (21) are respectively connected with the control module (3), and the control module (3) enables the current flowing through the power tube (22) to be reduced along with the rising of the bus voltage;
the control module (3) comprises a first resistor (311), a second resistor (312) and a third resistor (313), wherein the first resistor (311) is arranged between the distribution device bus and the inverting input end of the amplifier (21);
the second resistor (312) and the third resistor (313) are connected in series and then connected in parallel to two ends of the power tube (22), and one end of the third resistor (313) is connected with the sampling resistor (23).
2. The drive circuit according to claim 1, characterized in that an intermediate connection of the second resistor (312) and the third resistor (313) is connected to an inverting input of the amplifier (21), the non-inverting input of the amplifier (21) being connected to a first reference voltage;
the ripple suppression module (1) comprises a first capacitor (111), wherein the positive electrode of the first capacitor (111) is connected with a bus of the power distribution device, the negative electrode of the first capacitor (111) is connected with the input end of a power tube (22), and the load (4) is connected in parallel with the two ends of the first capacitor (111).
3. The LED driving circuit based on the power tube safety protection is characterized by comprising a ripple suppression module (1), a voltage-current conversion module (2) and a control module (3), wherein the input end of the ripple suppression module (1) and one end of the control module (3) are both connected with a bus of a power distribution device, and the ripple suppression module (1) is connected with a load (4) in parallel;
the voltage-current conversion module (2) comprises an amplifier (21), a power tube (22) and a sampling resistor (23), wherein the output end of the amplifier (21) is connected with the grid electrode of the power tube (22), the output end of the ripple suppression module (1) is connected with the drain electrode of the power tube (22), the source electrode of the power tube (22) is grounded through the sampling resistor (23), the drain electrode, the source electrode of the power tube (22), the non-inverting input end of the amplifier (21) and/or the inverting input end of the amplifier (21) are respectively connected with the control module (3), and the control module (3) enables the current flowing through the power tube (22) to be reduced along with the rising of the bus voltage;
the control module (3) comprises a first transconductance amplifier (321), a first constant current source (322) and a grounding capacitor (323), wherein the output end of the first constant current source (322), the output end of the first transconductance amplifier (321) and the positive electrode of the grounding capacitor (323) are connected with the non-inverting input end of the amplifier (21).
4. A driving circuit according to claim 3, characterized in that the control module (3) further comprises a fourth resistor (324) and a fifth resistor (325);
the fourth resistor (324) and the fifth resistor (325) are connected in series and then connected in parallel to two ends of the power tube (22), the input end of the first transconductance amplifier (321) and the fifth resistor (325) are both connected with the middle connecting ends of the power tube (22) and the sampling resistor (23), and the middle connecting end of the fourth resistor (324) and the fifth resistor (325) is connected with the inverting input end of the amplifier (21);
the ripple suppression module (1) comprises a first capacitor (111), wherein the positive electrode of the first capacitor (111) is connected with a bus of the power distribution device, the negative electrode of the first capacitor (111) is connected with the input end of a power tube (22), and the load (4) is connected in parallel with the two ends of the first capacitor (111).
5. The LED driving circuit based on the power tube safety protection is characterized by comprising a ripple suppression module (1), a voltage-current conversion module (2) and a control module (3), wherein the input end of the ripple suppression module (1) and one end of the control module (3) are both connected with a bus of a power distribution device, and the ripple suppression module (1) is connected with a load (4) in parallel;
the voltage-current conversion module (2) comprises an amplifier (21), a power tube (22) and a sampling resistor (23), wherein the output end of the amplifier (21) is connected with the grid electrode of the power tube (22), the output end of the ripple suppression module (1) is connected with the drain electrode of the power tube (22), the source electrode of the power tube (22) is grounded through the sampling resistor (23), the drain electrode, the source electrode of the power tube (22), the non-inverting input end of the amplifier (21) and/or the inverting input end of the amplifier (21) are respectively connected with the control module (3), and the control module (3) enables the current flowing through the power tube (22) to be reduced along with the rising of the bus voltage;
the ripple suppression module (1) comprises a second capacitor (121), a third capacitor (122), a voltage dividing resistor (123), a third constant current source (124) and a second power tube (125), wherein the positive electrode of the second capacitor (121) is connected with a bus of the power distribution device, the load (4) is connected with the voltage dividing resistor (123) and the third constant current source (124) in series to form a branch, the branch is connected with the second capacitor (121) in parallel, the third capacitor (122) is connected with the third constant current source (124) in parallel, the drain electrode and the source electrode of the second power tube (125) are connected with the two ends of the voltage dividing resistor (123) and the third constant current source (124) in parallel, and the middle connecting end of the voltage dividing resistor (123) and the third constant current source (124) is connected with the grid electrode of the second power tube (125);
the control module (3) comprises a sixth resistor (331) and a seventh resistor (332), the sixth resistor (331) and the seventh resistor (332) are connected in series and then connected in parallel to two ends of the power tube (22), the middle connecting end of the sixth resistor (331) and the seventh resistor (332) is connected with the inverting input end of the amplifier (21), and the non-inverting input end of the amplifier (21) is connected with a second reference voltage.
6. The LED driving circuit based on the power tube safety protection is characterized by comprising a ripple suppression module (1), a voltage-current conversion module (2) and a control module (3), wherein the input end of the ripple suppression module (1) and one end of the control module (3) are both connected with a bus of a power distribution device, and the ripple suppression module (1) is connected with a load (4) in parallel;
the voltage-current conversion module (2) comprises an amplifier (21), a power tube (22) and a sampling resistor (23), wherein the output end of the amplifier (21) is connected with the grid electrode of the power tube (22), the output end of the ripple suppression module (1) is connected with the drain electrode of the power tube (22), the source electrode of the power tube (22) is grounded through the sampling resistor (23), the drain electrode, the source electrode of the power tube (22), the non-inverting input end of the amplifier (21) and/or the inverting input end of the amplifier (21) are respectively connected with the control module (3), and the control module (3) enables the current flowing through the power tube (22) to be reduced along with the rising of the bus voltage;
the ripple suppression module (1) comprises a second capacitor (121), a third capacitor (122), a voltage dividing resistor (123), a third constant current source (124) and a second power tube (125), wherein the positive electrode of the second capacitor (121) is connected with a bus of the power distribution device, the load (4) is connected with the voltage dividing resistor (123) and the third constant current source (124) in series to form a branch, the branch is connected with the second capacitor (121) in parallel, the third capacitor (122) is connected with the third constant current source (124) in parallel, the drain electrode and the source electrode of the second power tube (125) are connected with the two ends of the voltage dividing resistor (123) and the third constant current source (124) in parallel, and the middle connecting end of the voltage dividing resistor (123) and the third constant current source (124) is connected with the grid electrode of the second power tube (125);
the control module (3) comprises a second transconductance amplifier (341), a second constant current source (342) and a grounding resistor (343), wherein the output end of the second constant current source (342), the output end of the second transconductance amplifier (341) and one end of the grounding resistor (343) are connected with the non-inverting input end of the amplifier (21), and the other end of the grounding resistor (343) is grounded;
the middle connecting end of the power tube (22) and the sampling resistor (23) is connected with the inverting input end of the amplifier (21).
7. The drive circuit according to claim 6, wherein the control module (3) further comprises an eighth resistor (344) and a ninth resistor (345);
one end of the eighth resistor (344) is connected with a bus of the power distribution device, the other end of the eighth resistor is connected with one end of the ninth resistor (345), the other end of the ninth resistor (345) is grounded, the intermediate connection ends of the eighth resistor (344) and the ninth resistor (345) are connected with the non-inverting input end of the second transconductance amplifier (341), and the inverting input end of the second transconductance amplifier (341) is connected with a third reference voltage.
8. The LED driving circuit based on the power tube safety protection is characterized by comprising a ripple suppression module (1), a voltage-current conversion module (2) and a control module (3), wherein the input end of the ripple suppression module (1) and one end of the control module (3) are both connected with a bus of a power distribution device, and the ripple suppression module (1) is connected with a load (4) in parallel;
the voltage-current conversion module (2) comprises an amplifier (21), a power tube (22) and a sampling resistor (23), wherein the output end of the amplifier (21) is connected with the grid electrode of the power tube (22), the output end of the ripple suppression module (1) is connected with the drain electrode of the power tube (22), the source electrode of the power tube (22) is grounded through the sampling resistor (23), the drain electrode, the source electrode of the power tube (22), the non-inverting input end of the amplifier (21) and/or the inverting input end of the amplifier (21) are respectively connected with the control module (3), and the control module (3) enables the current flowing through the power tube (22) to be reduced along with the rising of the bus voltage;
the ripple suppression module (1) comprises a first capacitor (111), wherein the positive electrode of the first capacitor (111) is connected with a bus of the power distribution device, the negative electrode of the first capacitor (111) is connected with the input end of a power tube (22), and the load (4) is connected in parallel with the two ends of the first capacitor (111);
the control module (3) comprises a tenth resistor (351), the tenth resistor (351) is connected with the power tube (22) in parallel, the non-inverting input end of the amplifier (21) is connected with a fourth reference voltage, and the middle connecting end of the power tube (22) and the sampling resistor (23) is connected with the inverting input end of the amplifier (21).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910053223.7A CN109618466B (en) | 2019-01-21 | 2019-01-21 | LED drive circuit based on power tube safety protection |
| PCT/CN2019/083590 WO2020151111A1 (en) | 2019-01-21 | 2019-04-22 | Led driver circuit based on power transistor safety protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910053223.7A CN109618466B (en) | 2019-01-21 | 2019-01-21 | LED drive circuit based on power tube safety protection |
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| CN109618466A CN109618466A (en) | 2019-04-12 |
| CN109618466B true CN109618466B (en) | 2024-02-20 |
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| CN201910053223.7A Active CN109618466B (en) | 2019-01-21 | 2019-01-21 | LED drive circuit based on power tube safety protection |
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| WO (1) | WO2020151111A1 (en) |
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| 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 |
| CN112701663B (en) * | 2020-12-25 | 2023-10-20 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS tube and power MOS tube assembly |
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| Publication number | Publication date |
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| CN109618466A (en) | 2019-04-12 |
| WO2020151111A1 (en) | 2020-07-30 |
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