CN110972356A - Drive control circuit and lighting drive circuit of light emitting diode - Google Patents
Drive control circuit and lighting drive circuit of light emitting diode Download PDFInfo
- Publication number
- CN110972356A CN110972356A CN201911344726.6A CN201911344726A CN110972356A CN 110972356 A CN110972356 A CN 110972356A CN 201911344726 A CN201911344726 A CN 201911344726A CN 110972356 A CN110972356 A CN 110972356A
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- resistor
- coupled
- negative feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The embodiment of the application provides a drive control circuit and an illumination drive circuit of a light emitting diode, and the drive control circuit comprises: the circuit comprises a first negative feedback circuit, a second negative feedback circuit, a current maintaining circuit and a first resistor. According to the technical scheme, when the adjusting current flows into the adjusting current input end, the adjusting current is irrelevant to the resistance of the first resistor, and therefore the size of the adjusting current is unchanged when the first resistors with different resistance sizes are used. Therefore, when the LED driving circuit is applied to LED driving, the adjusting current can be smaller, the current waste is reduced, the efficiency is improved, and because the adjusting current is smaller than the driving current, when the driving current flows into the driving current input end, no adjusting current flows into the adjusting current input end, so that the current waste can be avoided, and the efficiency is improved.
Description
Technical Field
The present disclosure relates to a driving circuit, and more particularly, to a driving control circuit, an illumination driving circuit of a light emitting diode, and a driving control method of a light emitting diode.
Background
In an LED control circuit for a silicon controlled dimmer (TRIAC). For high power systems, the internal resistor is typically set to a smaller resistance value, whereas when applied to low power systems, the resistor is set to a larger resistance value. Therefore, poor compatibility of product application is easily caused in use. Meanwhile, if the resistance value is maintained when various powers are applied, unnecessary power consumption is caused due to different required load currents, so that the overall efficiency is deteriorated.
Disclosure of Invention
An object of the present invention is to provide a driving control circuit for improving efficiency.
The embodiment of the application provides a drive control circuit, including:
the first negative feedback circuit is used for receiving a first reference voltage and a first input voltage and determining whether an adjusting current flows into the adjusting current input end to the driving control circuit or not according to a comparison result of the first reference voltage and the first input voltage;
a current maintaining circuit coupled to the first negative feedback circuit for providing the first input voltage to the first negative feedback circuit;
the second negative feedback circuit is used for receiving a second reference voltage and a second input voltage and determining whether a driving current flows into the driving control circuit from the driving current input end or not according to a comparison result of the second reference voltage and the second input voltage;
the first resistor is coupled with the current maintaining circuit and the second negative feedback circuit and used for controlling the magnitude of the driving current;
wherein the adjustment current is less than the drive current; the first input voltage is equal to a voltage difference between a first terminal of the current maintenance circuit and a second terminal of the current maintenance circuit.
In one embodiment, the current maintenance circuit includes:
a second resistor, a first end of the second resistor being a first end of the current maintaining circuit; the second end of the second resistor is the second end of the current maintaining circuit;
the positive input end of the subtracter is coupled with the first end of the second resistor; the reverse input end of the subtracter is coupled with the second end of the second resistor; the output end of the subtracter is coupled with the reverse input end of the first negative feedback circuit.
In one embodiment, the subtractor includes:
a third operational amplifier;
one end of the third resistor is coupled to the inverting input end of the third operational amplifier, and the other end of the third resistor is the inverting input end of the subtractor;
one end of the fourth resistor is coupled to the positive input end of the third operational amplifier, and the other end of the fourth resistor is the positive input end of the subtractor;
one end of the fifth resistor is coupled to the inverting input terminal of the third operational amplifier, and the other end of the fifth resistor is coupled to the output terminal of the third operational amplifier;
one end of the sixth resistor is connected with the positive input end of the third operational amplifier, and the other end of the sixth resistor is grounded;
the third resistor and the fifth resistor have the same resistance; the ratio of the fifth resistance to the third resistance is equal to the ratio of the sixth resistance to the fourth resistance.
In one embodiment, the first negative feedback circuit comprises:
the positive input end of the first operational amplifier is connected with a first reference voltage; the inverting input end of the first operational amplifier is coupled with the output end of the current maintaining circuit;
the grid electrode of the first field effect transistor is coupled with the output end of the first operational amplifier; the source electrode of the first field effect transistor is the first end of the first negative feedback circuit; the drain electrode of the first field effect transistor is the second end of the first negative feedback circuit.
In one embodiment, the second negative feedback circuit comprises:
the positive input end of the second operational amplifier is connected with a second reference voltage; the inverting input end of the second operational amplifier is coupled to the second end of the current maintaining circuit;
a gate of the second field effect transistor is coupled to the output end of the second operational amplifier, and a source of the second field effect transistor is a first end of the second negative feedback circuit; and the drain electrode of the second field effect transistor is the second end of the second negative feedback circuit.
The embodiment of the present application further provides an illumination driving circuit of a light emitting diode, including:
the drive control circuit described above;
the cathode of the light-emitting diode is coupled with the driving current input end of the driving control circuit;
and the silicon controlled dimmer is respectively coupled with the anode of the light emitting diode and the adjusting current input end of the drive control circuit.
In one embodiment, the adjustment current is greater than a holding current of the triac dimmer.
In one embodiment, the lighting driving circuit of the light emitting diode further comprises:
the input end of the rectifier bridge is coupled with the silicon controlled rectifier dimmer and receives alternating current; the rectifier bridge is used for converting alternating current into direct current; the output end of the rectifier bridge is respectively coupled with the driving current input end and the adjusting current input end.
The embodiment of the application also provides a driving control method of the light emitting diode, the method is applied to the driving control circuit, and the method comprises the following steps:
during the conduction period of the light emitting diode, the second negative feedback circuit receives a second reference voltage and a second input voltage, and controls the driving current to flow into the driving current input end according to the comparison result of the second reference voltage and the second input voltage;
the current maintaining circuit outputs a first input voltage to the first negative feedback circuit according to the driving current;
the first negative feedback circuit compares the first input voltage with the first reference voltage, and cuts off the adjustment current from the adjustment current input end according to the comparison result of the first reference voltage and the first input voltage.
In one embodiment, the method for controlling driving of the light emitting diode further includes:
during the turn-off period of the light-emitting diode, the first negative feedback circuit compares the first input voltage with the first reference voltage, and controls the adjusting current input end to flow in adjusting current according to the comparison result of the first reference voltage and the first input voltage.
According to the technical scheme provided by the embodiment of the application, when the adjusting current flows into the adjusting current input end, the adjusting current is irrelevant to the resistance value of the first resistor, so that the adjusting current is unchanged for the first resistors with different resistance values. Therefore, when the LED driving circuit is applied to LED driving, the adjusting current can be smaller, the current waste is reduced, the efficiency is improved, and because the adjusting current is smaller than the driving current, when the driving current flows into the driving current input end, no adjusting current flows into the adjusting current input end, so that the current waste can be avoided, and the efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below.
Fig. 1 is a schematic diagram of an illumination driving circuit of a light emitting diode provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of an illumination driving circuit of an LED according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a driving control circuit according to an embodiment of the present disclosure;
FIG. 4 is V in FIG. 1BUSA current waveform diagram of the voltage, the driving current input end BL and the adjusting current input end AL;
fig. 5 is a schematic structural diagram of a driving control circuit according to another embodiment of the present application;
FIG. 6 is a circuit diagram of a subtractor according to an embodiment of the present application;
fig. 7 is a flowchart illustrating a driving control method of a light emitting diode according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Fig. 1 is a schematic diagram of an illumination driving circuit of a light emitting diode according to an embodiment of the present disclosure. As shown in fig. 1, the led lighting driving circuit includes: a thyristor dimmer 51, a light emitting diode 52, and a drive control circuit 40. The driving control circuit 40 is coupled to the triac dimmer 51 and the light emitting diode 52. Wherein coupling may include direct connection, indirect connection, wired or wireless connection.
The driving control circuit 40 may include a driving control chip 41 and a first resistor 42 coupled to a CS pin of the driving control chip 41. The adjustment current input terminal AL of the driving control chip 41 is coupled to the triac dimmer 51, and the driving current input terminal BL is coupled to the light emitting diode 52. The thyristor dimmer 51 is used to adjust the brightness of the light emitting diode 52.
In an embodiment, the led lighting driving circuit may further include: the isolation diode D1 and the isolation diode D1 can play a role in preventing backflow when the voltage V is equal to VBUSWhen the voltage is less than that of the capacitor C1, the capacitor C1 is prevented from being paired with VBUSAnd charging is carried out.
As shown in fig. 2, in an embodiment, for the alternating current AC, the led lighting driving circuit may further include a rectifier bridge 53 for converting the alternating current into the direct current. The input terminal of the rectifier bridge 53 is coupled to the triac dimmer 51, receives ac power, and outputs dc power.
Fig. 3 is a schematic structural diagram of a driving control circuit 40 according to an embodiment of the present disclosure. The drive control circuit 40 includes: a first negative feedback circuit 411, a current maintaining circuit 412, a second negative feedback circuit 413, and a first resistor 42.
A positive input terminal (+) of the first negative feedback circuit 411 is for receiving the first reference voltage VREF1And an inverting input (-) coupled to the current sustaining circuit 412 for receiving the first input voltage; the first terminal (1) of the first negative feedback circuit 411 is coupled to the first terminal (1) of the current holding circuit and the second terminal (2) of the first negative feedback circuit 411 is coupled to the regulated current input terminal AL. The first negative feedback circuit 411 is used for receiving a first reference voltage VREF1And a first input voltage, and determining whether an adjustment current I flows into the adjustment current input end AL according to a comparison result between the first reference voltage and the first input voltageALTo the drive control circuit 40.
The voltage at the output terminal of the current holding circuit 412 is equal to the voltage difference between the first terminal of the current holding circuit 412 and the second terminal of the current holding circuit 412, which is the first input voltage provided to the first negative feedback circuit 411.
A positive input terminal (+) of the second negative feedback circuit 413 is for receiving the second reference voltage VREF2And an inverting input (-) coupled to the current sustaining circuit 412 for receiving the second input voltage; the first terminal (1) of the second negative feedback circuit 413 is coupled to the second terminal (2) of the current maintaining circuit 412 and the first resistor 42. The second terminal 2 of the second negative feedback circuit 413 is coupled to the driving current input terminal BL. The second negative feedback circuit 413 is used for receiving a second reference voltage VREF2And a second input voltage according to the second reference voltage VREF2Determining whether the driving current I flows into the driving current input end BL according to the comparison result of the first input voltageBLTo the drive control circuit 40.
In an embodiment, the first negative feedback circuit 411, the current maintaining circuit 412 and the second negative feedback circuit 413 may be packaged to drive the control chip 41.
As shown in FIG. 4, at times t1 and t3, the bus voltage VBUSThe voltage is less than the turn-on voltage of the LED 52, no current flows in the BL branch of the driving current input terminal, the AL branch of the adjusting current input terminal is turned on, and the current is outputThe input terminal AL flows in a regulated current IALFor providing a maintaining current (maintaining current) for maintaining the operation of the triac dimmer 51. At this time, the current I is adjustedALThe current value of (1) is equal to the voltage difference (equal to the first reference voltage V) generated by the first terminal (1) and the second terminal (2) of the current maintaining circuit 412REF1) Divided by the resistance between the first terminal (1) and the second terminal (2) of the current sustaining circuit 412, regardless of the resistance of the first resistor 42.
At time t2, bus voltage VBUSWhen the voltage is greater than the turn-on voltage of the light emitting diode 52, the driving current input end BL branch is turned on, and the driving current I of the driving current input end BL branchBLIs equal to the second reference voltage VREF2Divided by the resistance of the first resistor 42.
Since the adjustment current is smaller than the driving current, when the driving current input end BL branch is turned on, the current increases, and the voltage difference between the first end (1) and the second end (2) of the current maintaining circuit 412 is larger than the first reference voltage VREF1The voltage at the negative input (-) of the first negative feedback circuit 411 is greater than the voltage at the positive input (+), so that the first negative feedback circuit 411 can control the regulated current I flowing between the first terminal (1) and the second terminal (2) when the first terminal (1) and the second terminal (2) of the second negative feedback circuit 413 are conductedALCut off to reduce power loss.
In one embodiment, for high power systems, such as 10W systems, the first resistor 42 is generally set small; when the resistor is applied to a low-power system, such as a 3-5W bulb lamp system, the first resistor 42 is set to be larger. Since the current of the adjusting current input terminal AL branch is independent of the resistance of the first resistor 42 when the adjusting current input terminal AL branch is turned on, the current of the adjusting current input terminal AL branch may be a fixed value. In one embodiment, the current is adjusted only to ensure that the current is greater than the current that will maintain the triac dimmer 51 in operation, thereby improving efficiency and preventing the led 52 from flickering.
Fig. 5 is a schematic structural diagram of a driving control circuit 40 according to another embodiment of the present invention. The current maintaining circuit 412 may include a second resistor RCSAAnd a subtractor 61; the first negative feedback circuit 411 may includeComprises the following steps: a first operational amplifier OP3 and a switch N1. Switch N1 may be a field effect transistor; the second negative feedback circuit 413 may include: a second operational amplifier OP4 and a switch N2, switch N2 may be a field effect transistor.
A second resistor RCSAIs a first terminal of the current holding circuit 412; a second resistor RCSAIs the second terminal of the current sustaining circuit 412. A positive input terminal (+) of the subtractor 61 is coupled to the second resistor RCSAA first end of (a); the subtractor 61 has its inverting input (-) coupled to the second resistor RCSAA second end of (a); an output terminal of the subtractor 61 is coupled to an inverting input terminal of the first operational amplifier OP 3.
As shown in fig. 5, the positive input terminal of the first operational amplifier OP3 is connected to the first reference voltage VREF1(ii) a An inverting input terminal of the first operational amplifier OP3 is coupled to the output terminal of the subtractor 61. The output terminal of the current holding circuit 412 is the output terminal of the subtractor 61. The gate of the first field effect transistor N1 is coupled to the output terminal of the first operational amplifier OP 3; the source of the first fet N1 is the first terminal of the first negative feedback circuit 411 (i.e., the adjustment current input terminal AL pin); the drain of the first fet N1 is the second terminal of the first negative feedback circuit 411. As shown in fig. 5, the first field effect transistor N1 may be an N-channel field effect transistor (NMOS).
In one embodiment, as shown in fig. 5, the positive input terminal of the second operational amplifier OP4 is connected to the second reference voltage VREF2(ii) a The inverting input terminal of the second operational amplifier OP4 is coupled to the second terminal of the current holding circuit 412 (i.e. the second resistor R)CSAThe second end of (a). The gate of the second fet N2 is coupled to the output terminal of the second operational amplifier OP4, and the source of the second fet N2 is the first terminal of the second negative feedback circuit 413; the drain of the second fet N2 is the second terminal of the second negative feedback circuit 413. As shown in fig. 5, the second field effect transistor N2 may be an N-channel field effect transistor (NMOS).
As can be seen from FIG. 5, the second resistor RCSACan be integrated inside the driving control chip 41, so that a resistor can be omitted externally; at the same time due to the second resistance RCSAThe leads of the lead frame are not required to be packaged,the driving control chip 41 can save one pin.
When the bus voltage VBUSWhen the driving voltage is less than the turn-on voltage of the light emitting diode 52, the driving current input end BL branch has no current, and the adjusting current input end AL branch is turned on to provide a current for maintaining the operation of the triac dimmer 51. As can be seen in FIG. 5, the establishment of the OP3 loop causes the second resistance R to beCSAIs equal to VREF1Adjusting the current I of the branch of the current input terminal ALAL＝VREF1/RCSA. When the bus voltage VBUSWhen the voltage is greater than the turn-on voltage of the LED 52, the OP4 loop begins to be established, and the voltage drop of the first resistor 42 is equal to VREF2Current I of the branch of the drive current input BLBL＝VREF2/RCS。
When the branch of the adjustment current input terminal AL is turned on and the branch of the driving current input terminal BL is turned off, the current of the branch of the adjustment current input terminal AL is independent of the resistance of the first resistor 42, so that for the first resistors 42 with different resistance values, the second resistor R is connected to the first resistor RCSAThe resistance value of (c) may be constant. A second resistor RCSAThe resistance value can be set to be larger, so that the current of the adjusting current input end AL branch is smaller, the current waste is reduced, and the efficiency is improved. A second resistor RCSAThe resistance value only needs to satisfy IALIt is sufficient that the holding current is larger than that of the triac dimmer 51, so that the efficiency is improved as much as possible and the flicker of the light emitting diode 52 can be prevented.
The general blanking current is about 20mA, and the current of the LED is 40-200 mA, i.e. IAL<IBLWhen the driving current input end BL branch is conducted, the current will increase, so RCSAPressure drop of more than VREF1I.e. the voltage at the output of the subtractor is greater than VREF1And the voltage of the OP3 reverse input end is greater than that of the positive input end, so that the OP3 output is low, and the AL branch of the adjusting current input end is switched off, thereby avoiding the waste of current and improving the overall efficiency.
Fig. 6 is a circuit schematic diagram of the subtractor 61 according to an embodiment of the present application, and as shown in fig. 6, the subtractor 61 may include: a third operational amplifier OP5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
One end of the third resistor R3 is coupled to the inverting input terminal of the third operational amplifier OP5, and the other end of the third resistor R3 is the inverting input terminal of the subtractor 61; one end of the fourth resistor R4 is coupled to the positive input terminal of the third operational amplifier OP5, and the other end of the fourth resistor R4 is the positive input terminal of the subtractor; one end of the fifth resistor R5 is coupled to the inverting input terminal of the third operational amplifier OP5, and the other end of the fifth resistor R5 is coupled to the output terminal of the third operational amplifier OP 5; one end of the sixth resistor R6 is coupled to the positive input terminal of the third operational amplifier OP5, and the other end of the sixth resistor R6 is grounded; the third resistor R3 and the fifth resistor R5 have the same resistance, and the ratio of the fifth resistor R5 to the third resistor R3 is equal to the ratio of the sixth resistor R6 to the fourth resistor R4.
Assuming that the third operational amplifier OP5 is an ideal operational amplifier, the voltage at point a and the voltage at point B are equal, while the input current of OP5 is zero. The current flowing from the INN to the point a is equal to the current flowing from the point a to the OUT terminal of the third operational amplifier OP5, so the following formula can be obtained:
wherein, VA＝VBR5/R3 ═ R6/R4. By combining the above formula, simplification can obtain:
since R3 ═ R5, VOUT＝VINP-VINN. Thereby achieving that the voltage difference between the first terminal and the second terminal of the current maintaining circuit 412 is equal to the voltage of the output terminal thereof.
Fig. 7 is a flowchart illustrating a driving control method of a light emitting diode according to an embodiment of the present disclosure. This method can be applied to the drive control circuit 40 described in the above embodiments. The method may include the following processes.
Step 710: at bus voltage VBUSWhen the voltage is larger than the turn-on voltage of the LED, the LED is turned on, and the second negative feedback circuit 411 receives the second reference voltage VREF2And a second input voltage according to a second reference voltage VREF2And controlling the driving current to flow into the driving current input end BL according to the comparison result with the second input voltage.
At this time, the second reference voltage VREF2Equal to the second input voltage. In an embodiment, the second negative feedback circuit 411 includes a second operational amplifier OP4 and a second field effect transistor N2. When the second reference voltage VREF2When the second input voltage is equal to the second input voltage, the second operational amplifier OP4 outputs a high level, and the second fet N2 is turned on, thereby controlling the driving current input BL to flow into the driving current.
Step 720: the current holding circuit 412 outputs the first input voltage to the first negative feedback circuit 411 according to the driving current.
The current is generally adjusted to about 20mA, and the LED driving current is 40-200 mA. The trim current is less than the drive current. In one embodiment, the current maintaining circuit 412 includes a subtractor 61 and a resistor RCSA. Since the regulated current is the first reference voltage VREF1Divided by resistance RCSASince the driving current is greater than the adjustment current, the first input voltage outputted by the current holding circuit 412 is greater than the first reference voltage VREF1。
Step 730: the first negative feedback circuit 411 compares the first input voltage with a first reference voltage VREF1According to a first reference voltage VREF1The comparison result with the first input voltage disconnects the adjustment current input terminal AL from flowing the adjustment current.
In one embodiment, the first negative feedback circuit 411 comprises a first comparator OP3 and a first fet N1, and is configured to generate a first reference voltage VREF1When the voltage is less than the first input voltage, the first comparator OP3 outputs a low level, and the first fet N1 is turned off, thereby regulating the current input terminal AL to have no current flowing.
Further, at bus voltage VBUSIs less than the turn-on voltage of the LED,when the LED is cut off, the driving current input end BL has no driving current. The first negative feedback circuit 411 compares the first input voltage with a first reference voltage VREF1According to a first reference voltage VREF1And controlling the adjusting current input end AL to flow in the adjusting current according to the comparison result of the first input voltage.
At this time, the first input voltage is equal to the first reference voltage VREF1The first operational amplifier OP3 outputs a high level, the first fet N1 is turned on, and the adjustment current input terminal AL flows the adjustment current. As long as the trim current is greater than the maintenance current that maintains the operation of the triac dimmer 51, LED flicker is prevented.
Claims (10)
1. A drive control circuit, comprising:
the first negative feedback circuit is used for receiving a first reference voltage and a first input voltage and determining whether an adjusting current flows into the adjusting current input end to the driving control circuit or not according to a comparison result of the first reference voltage and the first input voltage;
a current maintaining circuit coupled to the first negative feedback circuit for providing the first input voltage to the first negative feedback circuit;
the second negative feedback circuit is used for receiving a second reference voltage and a second input voltage and determining whether a driving current flows into the driving control circuit from the driving current input end or not according to a comparison result of the second reference voltage and the second input voltage;
the first resistor is coupled with the current maintaining circuit and the second negative feedback circuit and used for controlling the magnitude of the driving current;
wherein the adjustment current is less than the drive current; the first input voltage is equal to a voltage difference between a first terminal of the current maintenance circuit and a second terminal of the current maintenance circuit.
2. The drive control circuit according to claim 1, wherein the current maintaining circuit comprises:
a second resistor having a first end and a second end, the first end being coupled to the first negative feedback circuit;
the positive input end of the subtracter is coupled with the first end of the second resistor; the reverse input end of the subtracter is coupled with the second end of the second resistor; the output end of the subtracter is coupled with the reverse input end of the first negative feedback circuit.
3. The drive control circuit according to claim 2, wherein the subtractor comprises:
a third operational amplifier;
one end of the third resistor is coupled to the inverting input end of the third operational amplifier, and the other end of the third resistor is the inverting input end of the subtractor;
one end of the fourth resistor is coupled to the positive input end of the third operational amplifier, and the other end of the fourth resistor is the positive input end of the subtractor;
one end of the fifth resistor is coupled to the inverting input terminal of the third operational amplifier, and the other end of the fifth resistor is coupled to the output terminal of the third operational amplifier;
one end of the sixth resistor is coupled to the positive input end of the third operational amplifier, and the other end of the sixth resistor is grounded;
the third resistor and the fifth resistor have the same resistance; the ratio of the fifth resistance to the third resistance is equal to the ratio of the sixth resistance to the fourth resistance.
4. The drive control circuit of claim 1, wherein the first negative feedback circuit comprises:
a first operational amplifier having a forward input terminal for receiving a first reference voltage, and a reverse input terminal coupled to the output terminal of the current holding circuit;
the grid electrode of the first field effect transistor is coupled with the output end of the first operational amplifier; the source electrode of the first field effect transistor is the first end of the first negative feedback circuit; the drain electrode of the first field effect transistor is the second end of the first negative feedback circuit.
5. The drive control circuit of claim 1, wherein the second negative feedback circuit comprises:
the positive input end of the second operational amplifier is connected with a second reference voltage; the inverting input end of the second operational amplifier is coupled to the second end of the current maintaining circuit;
a gate of the second field effect transistor is coupled to the output end of the second operational amplifier, and a source of the second field effect transistor is a first end of the second negative feedback circuit; and the drain electrode of the second field effect transistor is the second end of the second negative feedback circuit.
6. An illumination driving circuit for a light emitting diode, comprising:
the drive control circuit of any one of claims 1-5;
the cathode of the light-emitting diode is coupled with the driving current input end of the driving control circuit;
and the silicon controlled dimmer is respectively coupled with the anode of the light emitting diode and the adjusting current input end of the drive control circuit.
7. The LED lighting driving circuit of claim 6, wherein the adjustment current is greater than a holding current of the SCR dimmer.
8. The lighting driving circuit of the light emitting diode as claimed in claim 6, further comprising:
the input end of the rectifier bridge is coupled with the silicon controlled rectifier dimmer and receives alternating current; the rectifier bridge is used for converting alternating current into direct current; the output end of the rectifier bridge is respectively coupled with the driving current input end and the adjusting current input end.
9. A method for controlling driving of a light emitting diode, the method being applied to the driving control circuit according to any one of claims 1 to 5, the method comprising:
during the conduction period of the light emitting diode, the second negative feedback circuit receives a second reference voltage and a second input voltage, and controls the driving current to flow into the driving current input end according to the comparison result of the second reference voltage and the second input voltage;
the current maintaining circuit outputs a first input voltage to the first negative feedback circuit according to the driving current;
the first negative feedback circuit compares the first input voltage with the first reference voltage, and cuts off the adjustment current from the adjustment current input end according to the comparison result of the first reference voltage and the first input voltage.
10. The method of claim 9, further comprising:
during the turn-off period of the light-emitting diode, the first negative feedback circuit compares the first input voltage with the first reference voltage, and controls the adjusting current input end to flow in adjusting current according to the comparison result of the first reference voltage and the first input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911344726.6A CN110972356A (en) | 2019-12-23 | 2019-12-23 | Drive control circuit and lighting drive circuit of light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911344726.6A CN110972356A (en) | 2019-12-23 | 2019-12-23 | Drive control circuit and lighting drive circuit of light emitting diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110972356A true CN110972356A (en) | 2020-04-07 |
Family
ID=70036281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911344726.6A Pending CN110972356A (en) | 2019-12-23 | 2019-12-23 | Drive control circuit and lighting drive circuit of light emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110972356A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332212A (en) * | 2020-10-27 | 2021-02-05 | 深圳麦格米特电气股份有限公司 | Laser constant current drive circuit and laser projection display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106332390A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | Non-isolated LED constant-current driver chip, circuit and method |
| CN206077767U (en) * | 2016-09-23 | 2017-04-05 | 上海占空比电子科技有限公司 | A kind of actinic LED drive circuit of new thyristor regulating |
| CN106954297A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | A kind of actinic LED drive circuit of the thyristor regulating of novel efficient |
-
2019
- 2019-12-23 CN CN201911344726.6A patent/CN110972356A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106332390A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | Non-isolated LED constant-current driver chip, circuit and method |
| CN206077767U (en) * | 2016-09-23 | 2017-04-05 | 上海占空比电子科技有限公司 | A kind of actinic LED drive circuit of new thyristor regulating |
| CN106954297A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | A kind of actinic LED drive circuit of the thyristor regulating of novel efficient |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332212A (en) * | 2020-10-27 | 2021-02-05 | 深圳麦格米特电气股份有限公司 | Laser constant current drive circuit and laser projection display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108200685B (en) | LED lighting system for silicon controlled switch control | |
| US8629631B1 (en) | Method and system for improving start-up time of a light emitting diode (LED) driver at reduced input voltage | |
| JP5297119B2 (en) | Lighting lighting device, lighting device, and lighting fixture | |
| US8643297B2 (en) | Control circuit and control method for dimming LED lighting circuit | |
| US20110115391A1 (en) | Led lamp and led lamp module | |
| US8963439B2 (en) | Power supply for lighting and luminaire | |
| US11452188B2 (en) | Current drive circuit and method, and light emitting diode lighting device thereof | |
| US20160270177A1 (en) | Lighting circuit, luminaire, and illumination system | |
| US8803433B2 (en) | Lighting power source and luminaire | |
| US10492259B2 (en) | Dimmable LED driver and dimming method | |
| CN109587866B (en) | Electronic driver for LED lighting module and LED lamp | |
| JP2015185360A (en) | Lighting circuit, illumination device, and illumination system | |
| CN110972356A (en) | Drive control circuit and lighting drive circuit of light emitting diode | |
| KR20140070126A (en) | Apparatus and method of operating the the illumination apparatus | |
| JP2012074693A (en) | Driver circuit for light-emitting component | |
| CN211959621U (en) | LED lamp with dimming function | |
| CN114501699A (en) | Dimming circuit, dimmer and LED lighting device | |
| CN109743818B (en) | LED spotlight circuit | |
| JP2015185377A (en) | Lighting circuit, illumination device, and illumination system | |
| KR101264175B1 (en) | Dimmer using phase control | |
| JP7511143B2 (en) | Lighting device | |
| JP6164129B2 (en) | Lighting circuit and lighting device | |
| JP2014186870A (en) | Power supply for lighting and lighting fixture | |
| TWI445443B (en) | Control circuit and control method for dimming led lighting circuit | |
| US10841991B2 (en) | Dimmer interface having reduced power consumption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200407 |
|
| RJ01 | Rejection of invention patent application after publication |