CN111565500A - LED drive circuit with high power factor and low harmonic and LED device - Google Patents
LED drive circuit with high power factor and low harmonic and LED device Download PDFInfo
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Abstract
The invention belongs to the technical field of LED driving, and discloses an LED driving circuit with high power factor and low harmonic and an LED device, wherein a voltage division circuit divides direct-current voltage to generate reference voltage, and a clamping circuit outputs an analog quantity signal equal to the reference voltage; the constant current circuit controls the output current according to the analog quantity signal so that the output current is in direct proportion to the analog quantity signal, or controls the output current so that the output current is in direct proportion to the reference voltage so that the output current of the constant current circuit is in direct proportion to the direct-current voltage, and therefore harmonic distortion of the LED drive circuit with high power factor and low harmonic is reduced.
Description
Technical Field
The invention belongs to the technical field of LED driving, and particularly relates to an LED driving circuit with high power factor and low harmonic and an LED device.
Background
The conventional LED driving circuit generally adopts constant current driving, but the constant current driving realized by using an operational amplifier and a switching element generally has the problems of low power factor and overlarge harmonic distortion, and particularly for a high-power LED driving circuit, the problems of low power factor and harmonic distortion are more obvious. Therefore, the conventional LED driving circuit is improved to drive the LED by using the sectional driving circuit, so as to improve the power factor, but the problem of excessive harmonic distortion is still not solved in this driving manner. Therefore, there is a need for a high power factor and low harmonic LED driving circuit to solve the problem of excessive harmonic distortion in LED driving.
Disclosure of Invention
In view of this, embodiments of the present invention provide an LED driving circuit with high power factor and low harmonic and an LED device, which aim to solve the problem of excessive harmonic distortion in the conventional technical solution.
The embodiment of the invention provides a high-power-factor low-harmonic LED drive circuit, which comprises a voltage division circuit, an LED component, N clamping circuits, N +1 constant current circuits and a current limiting component, wherein the voltage division circuit is connected with the LED component;
the voltage division circuit is configured to divide a direct-current voltage to generate a reference voltage when the direct-current voltage is switched on;
the LED assembly comprises N +1 loads which are sequentially connected in series, the N +1 loads comprise a first load to an N +1 th load, the positive pole of the first load is connected with direct-current voltage, and the negative pole of the kth load is connected with the positive pole of the kth +1 th load; wherein N is an integer greater than or equal to 1, and k is a positive integer less than or equal to N;
the ith clamping circuit is connected with the voltage division circuit and is configured to output an analog quantity signal equal to the reference voltage when the reference voltage is less than the clamping voltage of the ith clamping circuit and when the reference voltage is greater than or equal to the clamping voltage of the (i-1) th clamping circuit; wherein i is a positive integer less than or equal to N;
the jth constant current circuit is connected with the jth clamping circuit, the jth load, the jth +1 load and the current limiting component and is configured to control output current according to the analog quantity signal so that the output current is in direct proportion to the analog quantity signal; wherein j is a positive integer less than or equal to N;
the (N + 1) th constant current circuit is connected with the (N + 1) th load, the voltage division circuit and the current limiting component and is configured to control output current so that the output current is in direct proportion to the reference voltage when the reference voltage is greater than or equal to the clamping voltage of the Nth clamping circuit and is less than the upper limit voltage;
the current limiting component is configured to limit an output current of the constant current circuit.
In one embodiment of the first aspect, each of the N clamping circuits includes a clamping component, and the clamping component includes a first operational amplifier, a second operational amplifier, a first field effect transistor, and a first resistor;
the non-inverting input end of the first operational amplifier is a reference voltage input end of a clamping circuit, the non-inverting input end of the second operational amplifier is a clamping voltage input end of the clamping circuit, the inverting input end of the first operational amplifier, the inverting input end of the second operational amplifier, the source electrode of the first field effect transistor and the first end of the first resistor jointly form an output end of the clamping circuit, the output end of the first operational amplifier and the output end of the second operational amplifier are connected to the grid electrode of the first field effect transistor in a shared mode, the drain electrode of the first field effect transistor is connected with an internal power supply, and the second end of the first resistor is connected with a power supply ground.
In one embodiment of the first aspect, each of the N constant current circuits includes a constant current component, and the constant current component includes a third operational amplifier and a second field effect transistor;
the non-inverting input end of the third operational amplifier is an analog quantity signal input end of the constant current component, the output end of the third operational amplifier is connected with the grid electrode of the second field-effect tube, the negative phase input end of the third operational amplifier and the source electrode of the second field-effect tube jointly form an output current output end of the constant current component, and the drain electrode of the second field-effect tube is an input voltage input end of the constant current component;
the (N + 1) th constant current circuit comprises a fourth operational amplifier and a third field effect transistor;
the non-inverting input end of the fourth operational amplifier is the upper limit voltage input end of the (N + 1) th constant current circuit, the output end of the fourth operational amplifier is connected with the grid electrode of the third field-effect tube, the negative phase input end of the fourth operational amplifier and the source electrode of the third field-effect tube jointly form the output current output end of the (N + 1) th constant current circuit, and the drain electrode of the third field-effect tube is the input voltage input end of the (N + 1) th constant current circuit.
In one embodiment of the first aspect, the voltage divider circuit includes a second resistor and a third resistor, and a second end of the second resistor and a first end of the third resistor together form a reference voltage output end of the voltage divider circuit; the first end of the second resistor is a direct-current voltage first input end of the voltage division circuit, and the second end of the third resistor is a direct-current voltage second input end of the voltage division circuit.
In one embodiment of the first aspect, the high power factor low harmonic LED driving circuit further includes:
and a rectifying circuit electrically connected to the alternating current for rectifying the alternating current to generate a direct current voltage.
In one embodiment of the first aspect, the rectifying circuit includes a first diode, a second diode, a third diode, and a fourth diode; the positive pole of the first diode and the positive pole of the fourth diode jointly form a second direct current voltage output end of the rectifying circuit, the negative pole of the first diode and the positive pole of the second diode jointly form a first alternating current input end of the rectifying circuit, the negative pole of the second diode and the negative pole of the third diode jointly form a first direct current voltage output end of the rectifying circuit, and the positive pole of the third diode and the negative pole of the fourth diode jointly form a second alternating current input end of the rectifying circuit.
A second aspect of the embodiments of the present invention provides an LED device, which includes the LED driving circuit with high power factor and low harmonic as described in any one of the first aspect.
The LED drive circuit with high power factor and low harmonic is provided with N clamping circuits and N +1 constant current circuits; when the reference voltage is less than the clamping voltage of the ith clamping circuit and the reference voltage is greater than or equal to the clamping voltage of the (i-1) th clamping circuit, the ith clamping circuit outputs an analog quantity signal equal to the reference voltage to the jth constant current circuit, and the jth constant current circuit controls the output current according to the analog quantity signal so that the output current is in direct proportion to the analog quantity signal; when the reference voltage is greater than or equal to the clamping voltage of the Nth clamping circuit and the reference voltage is less than the upper limit voltage, the (N + 1) th constant current circuit controls the output current to enable the output current to be in direct proportion to the reference voltage; therefore, the N clamping circuits and the N +1 constant current circuits keep the output current of the LED driving circuit in direct proportion to the direct-current voltage, and harmonic distortion of the LED driving circuit is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic block diagram of a high power factor low harmonic LED driving circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a clamping assembly according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a constant current device according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of an N +1 th constant current circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a voltage divider circuit according to an embodiment of the present disclosure;
FIG. 6 is a schematic block diagram of a high power factor low harmonic LED driver circuit according to another embodiment of the present application;
fig. 7 is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present application;
fig. 8 is a schematic circuit diagram of a high power factor low harmonic LED driving circuit according to an embodiment of the present application;
fig. 9 is a waveform of an output voltage and a current of the LED driving circuit with high power factor and low harmonic according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the embodiment of the present invention provides an LED driving circuit with high power factor and low harmonic, and for convenience of illustration, only the relevant parts of the embodiment are shown, and as described in detail below, an LED driving circuit with high power factor and low harmonic 1 includes a voltage dividing circuit 101, an LED component 11, N clamping circuits, N +1 constant current circuits, and a current limiting component 14.
The voltage dividing circuit 101 is configured to divide the dc voltage to generate a reference voltage when the dc voltage is applied.
The LED assembly 11 comprises N +1 loads which are sequentially connected in series, wherein the N +1 loads comprise a first load 111 to an N +1 th load 11N +1, the positive pole of the first load 111 is connected with direct current voltage, and the negative pole of the kth load is connected with the positive pole of the kth +1 th load; wherein N is an integer greater than or equal to 1, which is equivalent to that the LED assembly 11 at least includes 2 loads; wherein k is a positive integer not greater than N.
An ith clamping circuit 12i of the N clamping circuits is connected to the voltage dividing circuit 101, the ith clamping circuit 12i inputs a reference voltage, and the ith clamping circuit 12i is further configured to output an analog quantity signal equal to the reference voltage when the reference voltage is less than the clamping voltage of the ith clamping circuit 12i and when the reference voltage is greater than or equal to the clamping voltage of the (i-1) th clamping circuit; the clamping voltage of the (i-1) th clamping circuit is less than the clamping voltage of the (i) th clamping circuit 12 i; wherein i is a positive integer less than or equal to N, and since N is an integer greater than or equal to 1, the minimum value of i is 1; it should be noted that when N is 1, i.e. i is also 1, there is no i-1 th clamp, and the first clamp is configured to output an analog signal equal to the reference voltage when the reference voltage is less than the clamp voltage of the first clamp 121.
The N +1 constant current circuits comprise N constant current circuits and an N +1 th constant current circuit. The jth constant current circuit 13j in the N constant current circuits is respectively connected with the jth clamping circuit, the jth load, the jth +1 load and the current limiting component 14; the jth constant current circuit 13j is further configured to control the output current in accordance with the analog quantity signal so that the output current is proportional to the analog quantity signal; wherein j is a positive integer less than or equal to N. The output current of the jth constant current circuit 13j is in direct proportion to the analog quantity signal, the analog quantity signal is equal to the reference voltage, and the reference voltage is obtained by dividing the direct current voltage, so that when the output current of the jth constant current circuit 13j is in direct proportion to the direct current voltage, the harmonic distortion of the LED driving circuit is small.
The (N + 1) th constant current circuit 13N +1 is respectively connected with the (N + 1) th load 11N +1, the voltage division circuit 101 and the current limiting component 14; the (N + 1) th constant current circuit 13N +1 is further configured to control the output current so that the output current is proportional to the reference voltage when the reference voltage is equal to or greater than the clamping voltage of the nth clamping circuit and the reference voltage is less than the upper limit voltage. The upper limit voltage is the peak value that the direct current voltage of the reference voltage can reach under normal conditions. Because the reference voltage is obtained by dividing the direct-current voltage, the waveform of the reference voltage is the same as that of the direct-current voltage, and the output current of the (N + 1) th constant current circuit 13N +1 is in proportion to the waveform of the reference voltage, the output current of the (N + 1) th constant current circuit 13N +1 is in proportion to the direct-current voltage, and therefore, when the (N + 1) th constant current circuit 13N +1 outputs, harmonic distortion of the LED driving circuit is small.
The current limiting component 14 is configured to limit the output current of the constant current circuit.
As shown in fig. 2, in one embodiment, the N clamping circuits each include a clamping component comprising: the circuit comprises a first operational amplifier U1, a second operational amplifier U2, a first field effect transistor Q1 and a first resistor R1; the non-inverting input end of the first operational amplifier U1 is a reference voltage input end of the clamping circuit; the non-inverting input end of the second operational amplifier U2 is a clamping voltage input end of the clamping circuit; the inverting input end of the first operational amplifier U1, the inverting input end of the second operational amplifier U2, the source of the first field-effect transistor Q1 and the first end of the first resistor R1 jointly form the output end of the clamping circuit; the output end of the first operational amplifier U1 and the output end of the second operational amplifier U2 are connected to the grid of the first field effect transistor Q1 in common; the drain electrode of the first field effect transistor Q1 is connected with an internal power supply; a second terminal of the first resistor R1 is connected to power ground.
As shown in fig. 3, in one embodiment, each of the N constant current circuits includes a constant current component including a third operational amplifier U3 and a second field effect transistor Q2; the non-inverting input end of the third operational amplifier U3 is the analog quantity signal input end of the constant current component; the output end of the third operational amplifier U3 is connected with the gate of the second field-effect transistor Q2; the negative phase input end of the third operational amplifier U3 and the source electrode of the second field-effect tube Q2 jointly form the output current output end of the constant current component; the drain of the second fet Q2 is the input voltage input of the constant current component.
As shown in fig. 4, in one embodiment, the (N + 1) th constant current circuit 13N +1 includes a fourth operational amplifier U4 and a third field effect transistor Q3; the non-inverting input terminal of the fourth operational amplifier U4 is the upper limit voltage input terminal of the (N + 1) th constant current circuit 13N + 1; the output end of the fourth operational amplifier U4 is connected with the gate of the third field effect transistor Q3; the negative phase input end of the fourth operational amplifier U4 and the source electrode of the third field-effect tube Q3 jointly form the output current output end of the (N + 1) th constant current circuit 13N + 1; the drain of the third field effect transistor Q3 is the input voltage input terminal of the (N + 1) th constant current circuit 13N + 1.
As shown in fig. 5, in an embodiment, the voltage divider circuit 101 includes a second resistor R2 and a third resistor R3, and a second terminal of the second resistor R2 and a first terminal of the third resistor R3 together form an output terminal of the voltage divider circuit 101; the first terminal of the second resistor R2 is a dc voltage first input terminal of the voltage divider 101, and the second terminal of the third resistor R3 is a dc voltage second input terminal of the voltage divider 101.
As shown in fig. 6, in one embodiment, the LED driving circuit 1 with high power factor and low harmonic further includes a rectifying circuit 105, and the rectifying circuit 105 is connected to the alternating current for rectifying the alternating current to generate a direct current voltage.
As shown in fig. 7, in one embodiment, the rectifying circuit 105 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the anode of the first diode D1 and the anode of the fourth diode D4 together form a second output end of the rectifying circuit 105, the cathode of the first diode D1 and the anode of the second diode D2 together form a first input end of the rectifying circuit 105, the cathode of the second diode D2 and the cathode of the third diode D3 together form a first output end of the rectifying circuit 105, and the anode of the third diode D3 and the cathode of the fourth diode D4 together form a second input end of the rectifying circuit 105.
Fig. 8 is further described with reference to the operation principle, wherein fig. 7 is a schematic circuit diagram of a high power factor low harmonic LED driving circuit when N is 2, that is, the high power factor low harmonic LED driving circuit 1 includes a rectifying circuit 105, a voltage dividing circuit 101, an LED assembly 11, two clamping circuits, three constant current circuits, and a current limiting assembly 14, the current limiting assembly 14 is a resistor R4, wherein the LED assembly 11 includes a first light emitting diode L1, a second light emitting diode L2, and a third light emitting diode L3; it should be noted that the present embodiment is not limited to the LED driving circuit 1 with high power factor and low harmonic, but one example of the present embodiment illustrates that N of the LED driving circuit 1 with high power factor and low harmonic cannot be considered to be 2. Wherein the rectifying circuit 105 rectifies the alternating current to output a direct current voltage, and the second resistor R2 and the third resistor R3 divide the direct current voltage and output a reference voltage.
When the reference voltage is not greater than the clamping voltage of the first clamping circuit 121, the reference voltage is input to the positive input terminal of the first operational amplifier U1 of the first clamping circuit 121, the clamping voltage V1 is input to the positive input terminal of the second operational amplifier U2, because the negative input terminal of the first operational amplifier U1, the negative input terminal of the second operational amplifier U2, the source of the first fet Q1, and the first terminal of the first resistor R1 are connected in common, the first operational amplifier U1 outputs a high level to the gate of the first fet Q1, so that the first fet Q1 is turned on, so that the source of the first fet Q1 outputs an analog signal equal to the reference voltage to the positive input terminal of the third operational amplifier U3, so that the output terminal of the third operational amplifier U3 outputs a high level to the gate of the second fet Q2 of the first constant current circuit 131, so that the second fet Q2 of the first constant current circuit 131 is turned on, meanwhile, since the negative phase input terminal of the third operational amplifier U3, the source of the second fet Q2, and the first terminal of the current limiting device 14 (the fourth resistor R4) are connected in common, the current flowing through the first light emitting diode L1 is proportional to the analog signal, and the current flowing through the first light emitting diode L1 is proportional to the dc voltage, so that when only the first light emitting diode L1 is turned on, the output current of the LED driving circuit is proportional to the dc voltage, and harmonic distortion is small.
When the reference voltage is greater than the clamping voltage of the first clamping circuit 121, and the reference voltage is not greater than the clamping voltage of the second clamping circuit 122, because the voltage at the negative input terminal of the third operational amplifier U3 of the first clamping circuit 121 is greater than the voltage at the positive input terminal, therefore, the output terminal of the third operational amplifier U3 of the first clamping circuit 121 outputs a low level to turn off the second fet Q2 of the first constant current module 121, and at this time, the second clamping circuit 122 outputs an analog quantity equal to the reference voltage to the second constant current module 132 to turn on the second fet Q2 of the second constant current module 132, so that the current flowing through the first and second light emitting diodes L1 and L2 is proportional to the dc voltage, therefore, when the first light emitting diode L1 and the second light emitting diode L2 are both turned on, the output current of the LED driving circuit is proportional to the dc voltage, and harmonic distortion is small.
When the reference voltage is greater than the clamping voltage of the second clamping circuit 122, the voltage at the negative phase input terminal of the third operational amplifier U3 of the second clamping circuit 122 is greater than the voltage at the positive phase input terminal, the output terminal of the third operational amplifier U3 of the second clamping circuit 122 outputs a low level to turn off the second fet Q2 of the second clamping circuit 122, and the fourth operational amplifier U4 outputs a high level to the third fet Q3 to turn on the third fet Q3, so that the current flowing through the first, second, and third leds L1, L2, and L3 is proportional to the reference voltage, so that the current flowing through the first, second, and third leds L1, L2, and L3 is proportional to the direct current voltage, and thus when the first, second, and third leds L1, L2, and L3 are all turned on, the output current and the direct current voltage of the LED driving circuit 1 with high power factor and low harmonic wave are also in direct proportion, and the harmonic wave distortion is small. In summary, the waveforms of the output current and the dc voltage of the LED driving circuit 1 with high power factor and low harmonic are as shown in fig. 9, and the harmonic distortion is small.
An embodiment of the present invention further provides an LED device, where the LED device includes the LED driving circuit with high power factor and low harmonic in any of the above embodiments, and because the LED device in this embodiment includes the LED driving circuit with high power factor and low harmonic in any of the above embodiments, the LED device in this embodiment at least has the corresponding beneficial effects of the LED driving circuit with high power factor and low harmonic in any of the above embodiments.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An LED drive circuit with high power factor and low harmonic is characterized in that,
the LED drive circuit with high power factor and low harmonic comprises a voltage division circuit, an LED component, N clamping circuits, N +1 constant current circuits and a current limiting component;
the voltage division circuit is configured to divide a direct-current voltage to generate a reference voltage when the direct-current voltage is switched on;
the LED assembly comprises N +1 loads which are sequentially connected in series, the N +1 loads comprise a first load to an N +1 th load, the positive pole of the first load is connected with direct-current voltage, and the negative pole of the kth load is connected with the positive pole of the kth +1 th load; wherein N is an integer greater than or equal to 1, and k is a positive integer less than or equal to N;
the ith clamping circuit is connected with the voltage division circuit and is configured to output an analog quantity signal equal to the reference voltage when the reference voltage is less than the clamping voltage of the ith clamping circuit and when the reference voltage is greater than or equal to the clamping voltage of the (i-1) th clamping circuit; wherein i is a positive integer less than or equal to N;
the jth constant current circuit is connected with the jth clamping circuit, the jth load, the jth +1 load and the current limiting component and is configured to control output current according to the analog quantity signal so that the output current is in direct proportion to the analog quantity signal; wherein j is a positive integer less than or equal to N;
the (N + 1) th constant current circuit is connected with the (N + 1) th load, the voltage division circuit and the current limiting component and is configured to control output current so that the output current is in direct proportion to the reference voltage when the reference voltage is greater than or equal to the clamping voltage of the Nth clamping circuit and is less than the upper limit voltage;
the current limiting component is configured to limit an output current of the constant current circuit.
2. The high power factor low harmonic LED drive circuit of claim 1 wherein each of the N clamping circuits comprises a clamping component comprising a first operational amplifier, a second operational amplifier, a first field effect transistor, and a first resistor;
the non-inverting input end of the first operational amplifier is a reference voltage input end of a clamping circuit, the non-inverting input end of the second operational amplifier is a clamping voltage input end of the clamping circuit, the inverting input end of the first operational amplifier, the inverting input end of the second operational amplifier, the source electrode of the first field effect transistor and the first end of the first resistor jointly form an output end of the clamping circuit, the output end of the first operational amplifier and the output end of the second operational amplifier are connected to the grid electrode of the first field effect transistor in a shared mode, the drain electrode of the first field effect transistor is connected with an internal power supply, and the second end of the first resistor is connected with a power supply ground.
3. The high-power-factor low-harmonic LED driving circuit according to claim 1, wherein each of the N constant current circuits includes a constant current component, and the constant current component includes a third operational amplifier and a second field-effect transistor;
the non-inverting input end of the third operational amplifier is an analog quantity signal input end of the constant current component, the output end of the third operational amplifier is connected with the grid electrode of the second field-effect tube, the negative phase input end of the third operational amplifier and the source electrode of the second field-effect tube jointly form an output current output end of the constant current component, and the drain electrode of the second field-effect tube is an input voltage input end of the constant current component;
the (N + 1) th constant current circuit comprises a fourth operational amplifier and a third field effect transistor;
the non-inverting input end of the fourth operational amplifier is the upper limit voltage input end of the (N + 1) th constant current circuit, the output end of the fourth operational amplifier is connected with the grid electrode of the third field-effect tube, the negative phase input end of the fourth operational amplifier and the source electrode of the third field-effect tube jointly form the output current output end of the (N + 1) th constant current circuit, and the drain electrode of the third field-effect tube is the input voltage input end of the (N + 1) th constant current circuit.
4. The high power factor low harmonic LED drive circuit of claim 1 wherein the voltage divider circuit comprises a second resistor and a third resistor, a second terminal of the second resistor and a first terminal of the third resistor together forming a reference voltage output terminal of the voltage divider circuit; the first end of the second resistor is a direct-current voltage first input end of the voltage division circuit, and the second end of the third resistor is a direct-current voltage second input end of the voltage division circuit.
5. The high power factor low harmonic LED drive circuit of claim 1 further comprising:
and a rectifying circuit electrically connected to the alternating current for rectifying the alternating current to generate a direct current voltage.
6. The high power factor low harmonic LED drive circuit of claim 5 wherein the rectifying circuit comprises a first diode, a second diode, a third diode, and a fourth diode; the positive pole of the first diode and the positive pole of the fourth diode jointly form a second direct current voltage output end of the rectifying circuit, the negative pole of the first diode and the positive pole of the second diode jointly form a first alternating current input end of the rectifying circuit, the negative pole of the second diode and the negative pole of the third diode jointly form a first direct current voltage output end of the rectifying circuit, and the positive pole of the third diode and the negative pole of the fourth diode jointly form a second alternating current input end of the rectifying circuit.
7. An LED device comprising the high power factor low harmonic LED driving circuit according to any one of claims 1 to 6.
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| CN115379619A (en) * | 2022-10-13 | 2022-11-22 | 合肥灿芯科技有限公司 | LED common-cathode driving chip |
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| CN110913531A (en) * | 2019-11-29 | 2020-03-24 | 深圳市晟碟半导体有限公司 | Multi-segment linear LED driving circuit, device and driving method |
| CN211930938U (en) * | 2020-06-11 | 2020-11-13 | 深圳市明微电子股份有限公司 | LED drive circuit with high power factor and low harmonic and LED device |
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| CN115379619A (en) * | 2022-10-13 | 2022-11-22 | 合肥灿芯科技有限公司 | LED common-cathode driving chip |
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