CN210641106U - LED lighting high-power supply circuit with five-way output - Google Patents
LED lighting high-power supply circuit with five-way output Download PDFInfo
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- CN210641106U CN210641106U CN201921603732.4U CN201921603732U CN210641106U CN 210641106 U CN210641106 U CN 210641106U CN 201921603732 U CN201921603732 U CN 201921603732U CN 210641106 U CN210641106 U CN 210641106U
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Abstract
The utility model discloses a high-power supply circuit of LED illumination of five ways outputs, include: the LED lamp comprises an alternating current input filter circuit for absorbing superposed high-surge energy of a power grid, a PFC boost circuit and a boost control circuit for correcting phases of input current and voltage, an LLC half-bridge circuit and a half-bridge control circuit for controlling circuit switches, an output rectifying filter circuit for converting the stepped-down alternating current into direct current, a negative feedback circuit for controlling the magnitude of voltage and current, and a DC-DC output current equalizing circuit for balancing each external LED lamp bank. The utility model discloses a PFC boost circuit's power correction effect promotes power conversion efficiency, and LLC half-bridge circuit can reduce the turn-on loss of field effect tube and output diode's turn-off loss, through DC-DC output flow equalizing circuit's five ways independently reposition of redundant personnel and resistance regulation effect, can make each LED lamps and lanterns of group keep different electric current size, avoids LED lamps and lanterns to take place the light decay.
Description
Technical Field
The utility model relates to a LED power field especially relates to a high-power supply circuit of LED illumination of five way outputs.
Background
In the prior art, a common driving power supply for an LED high-power lamp adopts a single-group output mode, and the single-group output mode is characterized in that the output current is relatively large at a low output voltage. The LED high-power lamp generally adopts a plurality of integrated lamp beads or a plurality of high-power lamp beads which are connected in series to form a separated light source, and because the LED lamp beads have Vf difference among individuals, if the LED lamp beads are driven by a single-group output power supply, the condition of uneven current distribution can occur, so that the LED lamps of each group have larger light attenuation difference, and the normal use condition of the LED lamps is influenced.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the LED lighting high-power supply circuit has the advantages of balanced current, energy conservation, loss reduction, long service life and convenience in maintenance.
The technical scheme of the utility model as follows: a five-output LED lighting high-power supply circuit comprises:
the alternating current input filter circuit is used for absorbing high surge energy and lightning stroke energy superposed by a power grid and avoiding transmitting the high surge energy and the lightning stroke energy to a rear stage to cause the power supply to lose efficacy;
the PFC boost circuit is used for correcting the phase of the input current and the voltage and enabling the input current to change along with the input voltage, and the boost control circuit is used for controlling the PFC boost circuit;
the LLC half-bridge circuit is used for controlling a circuit switch and the half-bridge control circuit is used for controlling the LLC half-bridge circuit;
the output rectifying and filtering circuit is used for converting the alternating current after voltage reduction into direct current to be supplied to a post-stage circuit;
the negative feedback circuit is used for controlling the voltage and the current;
the DC-DC output current equalizing circuit is used for balancing each external LED lamp group and the transformer;
wherein, the input end of the AC input filter circuit is connected with a mains supply, the input end of the PFC booster circuit is connected with the output end of the AC input filter circuit, the input end of the boost control circuit is connected with the first output end of the PFC booster circuit, the second output end of the PFC booster circuit is connected with the input end of the LLC half-bridge circuit, the first input end of the LLC half-bridge circuit is connected with the first output end of the LLC half-bridge circuit, the second output end of the LLC half-bridge circuit and the output end of the half-bridge circuit are respectively connected with the input end of the transformer, the input end of the output rectifying filter circuit is connected with the first output end of the transformer, the first input end of the negative feedback circuit is connected with the second output end of the transformer, the second input end of the negative feedback circuit is connected with the first output end of the output rectifying filter circuit, and, and the second output end of the output rectifying and filtering circuit is connected with the input end of the DC-DC output current equalizing circuit.
According to the technical scheme, in the LED lighting high-power supply circuit with five-path output, the alternating current input filter circuit comprises the surge current suppression circuit, the EMC filter circuit and the full-wave bridge rectifier circuit, the surge current suppression circuit is connected with the mains supply input end, the input end of the EMC filter circuit is connected with the output end of the surge current suppression circuit, the input end of the full-wave bridge rectifier circuit is connected with the output end of the EMC filter circuit, and the output end of the full-wave bridge rectifier circuit is connected with the input end of the PFC booster circuit.
By adopting the technical scheme, in the five-output LED lighting high-power supply circuit, the PFC boost circuit comprises L4, D1, D2 and Q1, the input end of the L4 is connected with the output end of the alternating current input filter circuit, the anode of the D2 is connected with the output end of the L4, the anode of the D1 is connected with the input end of the L4, the cathode of the D1 is connected with the cathode of the D2, and the drain of the Q1 is connected with the cathode of the D2.
By adopting the above technical solutions, in the five-output high-power supply circuit for LED lighting, the boost control circuit includes U1, the first pin of U1 is connected with the output end of the PFC boost circuit, the third pin of U1 is connected with the input end of the PFC boost circuit, the fourth pin and the seventh pin of U1 are connected with the gate of Q1, respectively, and the fifth pin of U1 is connected with L4.
By adopting the above technical solutions, in the five-output high-power supply circuit for LED lighting, the LLC half-bridge circuit includes Q2, Q3, and C5, the drain of Q2 is connected to the output terminal of the PFC boost circuit, the source of Q2 is connected to the drain of Q3, the gate of Q2 is connected to the first input terminal of the transformer, the source of Q3 is connected to the second input terminal of the transformer, and the gate of Q3 is connected to the input terminal of the half-bridge control circuit.
By adopting the above technical solutions, in the five-output high-power supply circuit for LED lighting, the half-bridge control circuit includes U2, the fifteenth pin of U2 is connected to the gate of Q2, and the eleventh pin of U2 is connected to the gate of Q3.
By adopting the technical scheme, in the five-output LED lighting high-power supply circuit, the output rectifying and filtering circuit comprises D4, C8, C9 and C44, the C8, the C9 and the C44 are respectively connected in parallel, the first end of the D4 is connected with the power transformer, the second end of the D4 is respectively connected with the anodes of the C8, the C9 and the C44, and the cathodes of the C8, the C9 and the C44 are respectively connected with the DC-DC output current equalizing circuit.
By adopting the above technical solutions, in the five-output high-power supply circuit for LED lighting, the negative feedback circuit includes U4 and U3, the inverting input terminal of U4 is connected to the output rectifying and filtering circuit, the non-inverting input terminal of U4 is connected to the output terminal of the transformer, the output terminal of U4 is connected to the transmitting terminal of U3, and the receiving terminal of U3 is connected to the fifth pin of U2.
By adopting the technical scheme, in the LED lighting high-power supply circuit with five paths of outputs, the DC-DC output current-equalizing circuit comprises five paths of same LED power supply circuits, the five paths of LED power supply circuits are respectively connected with the output rectifying filter circuit, each LED power supply circuit comprises Ls, Ds, a resistor parallel group and a Cout, the input end of the Ls is connected with the output end of the output rectifying filter circuit, the input end of the Ds is connected with the output end of the Ls, the output end of the Ds is connected with the input end of the Cout, the resistor parallel group is connected between the Ds and the Cout, and the output end of the Cout is connected with an external LED lamp.
By adopting the technical schemes, the utility model can reduce the power loss and improve the power conversion efficiency through the power correction function of the PFC booster circuit, the LLC half-bridge circuit can reduce the turn-on loss of the field effect tube and the turn-off loss of the output diode, and the overall efficiency is improved; the output rectifying filter circuit can output current in a constant voltage mode, the rear stage is connected with the DC-DC output current-equalizing circuit, and through the regulation effect of five independent shunting and parallel resistor groups of the DC-DC output current-equalizing circuit, the LED lamps in each group can keep different current parameters, the brightness is stable, and the light attenuation of the LED lamps is avoided; meanwhile, a mode that five groups of independent LED lamps drive a power circuit is adopted, each group of LED lamps can be independently disassembled, assembled and maintained, and the maintenance is convenient; the whole power supply circuit has low energy consumption, high power conversion efficiency and long service life, and can be popularized and used.
Drawings
FIG. 1 is a schematic circuit flow diagram of the present invention;
fig. 2 is a circuit diagram of the ac input filter of the present invention;
fig. 3 is a diagram of the PFC boost circuit of the present invention;
fig. 4 is a circuit diagram of the boost control circuit of the present invention;
fig. 5 is a diagram of the LLC half-bridge circuit and output rectifying and filtering circuit of the present invention;
fig. 6 is a half-bridge control circuit diagram of the present invention;
FIG. 7 is a negative feedback circuit diagram of the present invention;
fig. 8 is a DC-DC output current equalizing circuit diagram of the present invention;
fig. 9 is a specific circuit diagram of one of the DC-DC output current equalizing circuits of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 9, a five-output high-power supply circuit for LED lighting includes:
the alternating current input filter circuit 1 is used for absorbing high surge energy and lightning stroke energy superposed by a power grid and avoiding transmitting the high surge energy and the lightning stroke energy to a rear stage to cause the power supply to lose efficacy;
a PFC boost circuit 2 for correcting the phase of the input current and the voltage to make the input current change with the input voltage, and a boost control circuit 3 for controlling the PFC boost circuit;
the LLC half-bridge circuit 4 is used for controlling circuit switches, and the half-bridge control circuit 5 is used for controlling the LLC half-bridge circuit 4;
an output rectifying and filtering circuit 6 for converting the stepped-down alternating current into direct current to be supplied to a subsequent circuit;
a negative feedback circuit 8 for controlling the magnitude of the voltage and current;
the DC-DC output current equalizing circuit 7 and the transformer are used for balancing each external LED lamp group;
wherein, the input end of the AC input filter circuit 1 is connected with the mains supply, the input end of the PFC booster circuit 2 is connected with the output end of the AC input filter circuit 1, the input end of the boost control circuit 3 is connected with the first output end of the PFC booster circuit, the second output end of the PFC booster circuit 2 is connected with the input end of the LLC half-bridge circuit 4, the first input end of the half-bridge control circuit 5 is connected with the first output end of the LLC half-bridge circuit 4, the second output end of the LLC half-bridge circuit 4 and the output end of the half-bridge control circuit 5 are respectively connected with the input end of the transformer, the input end of the output rectifying filter circuit 6 is connected with the first output end of the transformer, the first input end of the negative feedback circuit 8 is connected with the second output end of the transformer, the second input end of the negative feedback circuit 8 is connected with the first output, the output end of the negative feedback circuit 8 is connected with the second input end of the half-bridge control circuit 5, and the second output end of the output rectifying and filtering circuit 6 is connected with the input end of the DC-DC output current-sharing circuit 7.
As shown in fig. 2, further, the ac input filter circuit 1 includes a surge current suppression circuit 11, an EMC filter circuit 12, and a full-wave bridge rectifier circuit 13, the surge current suppression circuit 11 is connected to the mains input, the EMC filter circuit 12 input is connected to the surge current suppression circuit 11 output, the full-wave bridge rectifier circuit 13 input is connected to the EMC filter circuit 12 output, and the full-wave bridge rectifier circuit 13 output is connected to the input of the PFC boost circuit 2. When the ac mains is connected to the input terminal of the ac input filter circuit 1, the switching power supply generates a high inrush current when powered on, and if the instantaneous high current is not blocked, the device may be damaged. In this embodiment, the inrush current suppression circuit includes RV1, RV2 and RV3, RV1, RV2 and RV3 are piezoresistors, RV1, RV2 and RV3 are respectively connected in parallel with the power input end, RV1, RV2 and RV3 can effectively suppress the inrush current generated when the power supply is connected, after the effect of suppressing the inrush current is completed, due to the continuous action of the current, the resistance of the piezoresistor will be reduced to a very small degree, the power consumed by the piezoresistor can be ignored, and the normal working current will not be affected. The EMC filter circuit 12 can reduce the harmonic interference generated by the power supply during switching, and prevent the harmonic interference from affecting the normal operation of the lower-level electronic device. The full-wave bridge rectifier circuit 13 can convert the input commercial ac voltage into a unidirectional pulsating dc voltage.
As shown in fig. 3, the PFC boost circuit 2 can correct the phase of the input current and the input voltage, so that the input current varies with the input voltage, thereby improving the utilization rate of the electric energy. Preferably, the PFC boost circuit 2 includes a PFC inductor L4, a protection diode D1, a boost diode D2 and a MOS transistor Q1, an input end of the PFC inductor L4 is connected to an output end of the ac input filter circuit 1, an anode of the boost diode D2 is connected to an output end of the PFC inductor L4, an anode of the protection diode D1 is connected to an input end of the PFC inductor L4, a cathode of the protection diode D1 is connected to a cathode of the boost diode D2, and a drain of the MOS transistor Q1 is connected to a cathode of the boost diode D2. When the MOS transistor Q1 is conducted, the PFC inductor L4 stores energy; when the MOS transistor Q1 is turned off, the PFC inductor L4 may charge the boost diode D2 with the stored energy output. The protection diode D1 can shunt the current passing through the boost diode D2, and prevent the boost diode D2 from being damaged due to overcurrent when a large current passes through the PFC inductor L4 at the moment of starting.
As shown in fig. 4, the boost control circuit 3 may sample the input voltage to adjust the duty cycle of the control signal, i.e., to change the on and off times of the PFC boost circuit 2. Specifically, in this embodiment, the on and off time of the MOS transistor Q1 is changed, so as to stabilize the output voltage of the PFC. Preferably, the boost control circuit 3 includes a first IC chip U1, a first pin of the first IC chip U1 is connected to an output terminal of the PFC boost circuit 2, a third pin of the first IC chip U1 is connected to an input terminal of the PFC boost circuit 2, a fourth pin and a seventh pin of the first IC chip U1 are respectively connected to a gate of the MOS transistor Q1, and a fifth pin of the first IC chip U1 is connected to the PFC inductor L4.
As shown in FIG. 5, the LLC half-bridge circuit 4 reduces losses incurred during switching on and off of the switching devices. Preferably, the LLC half-bridge circuit 4 includes a first field-effect transistor Q2, a second field-effect transistor Q3, and a resonant capacitor C5, the drain of the first field-effect transistor Q2 is connected to the output terminal of the PFC boost circuit 2, the source of the first field-effect transistor Q2 is connected to the drain of the second field-effect transistor Q3, the gate of the first field-effect transistor Q2 is connected to the first input terminal of the transformer, the source of the second field-effect transistor Q3 is connected to the second input terminal of the transformer, and the gate of the second field-effect transistor Q3 is connected to the input terminal of the half-bridge control circuit 5. Through the resonance effect of the LLC half-bridge circuit 4, the current in the circuit is changed according to the sine rule of the voltage, and when the sine trend of the voltage passes through a zero point, the first field effect tube Q2 or the second field effect tube Q3 is switched on or off, so that the loss generated in the circuit is zero, and the loss is reduced.
As shown in fig. 6, the half-bridge control circuit 5 can detect the frequency of the voltage passing through the LLC half-bridge circuit 4, so as to control the on/off of the first field effect transistor Q2 or the second field effect transistor Q3 in the LLC half-bridge circuit 4. Preferably, the half-bridge control circuit 5 includes a second IC chip U2, a fifteenth pin of the second IC chip U2 is connected to the gate of the first field effect transistor Q2, and an eleventh pin of the second IC chip U2 is connected to the gate of the second field effect transistor Q3.
As shown in fig. 5, the output rectifying and filtering circuit 6 further includes a diode group D4, a diode group C8, a diode group C9, and a diode group C44, wherein the diode groups C8, C9, and C44 are respectively connected in parallel, a first end of the diode group D4 is connected to the power transformer, a second end of the diode group D4 is connected to anodes of the diodes C8, C9, and C44, and cathodes of the diodes C8, C9, and C44 are respectively connected to the DC-DC output current equalizing circuit 7. The diode group D14 can rectify the alternating current output by the power transformer to obtain pulsating direct current, and the pulsating direct current is filtered by the C8, the C9 and the C44 to obtain current output similar to direct current, so as to provide a direct current power supply for an external LED lamp of the post-stage DC-DC output current-sharing circuit 7.
As shown in fig. 8 and 9, further, the DC-DC output current equalizing circuit 7 includes five identical LED power circuits 71, the five LED power circuits 71 are respectively connected to the output rectifying and filtering circuit 6, each LED power circuit 71 includes an inductor Ls, a diode Ds, a parallel resistor 711 and a capacitor Cout, an input end of the inductor Ls is connected to an output end of the output rectifying and filtering circuit 6, an input end of the diode Ds is connected to an output end of the inductor Ls, an output end of the diode Ds is connected to an input end of the capacitor Cout, the parallel resistor 711 is connected between the diode Ds and the capacitor Cout, and an output end of the capacitor Cout is connected to an external LED lamp. Each group of the five-path LED power circuit 71 is independent, different output parameters can be set respectively, the circuit output parameters of each path are adjusted by adjusting the resistance value of the resistor parallel 711, and light attenuation caused by connecting LED lamps with large current in series is avoided.
As shown in fig. 6 and 7, the negative feedback circuit 8 further includes a dual operational amplifier U4 and an optical coupler U3, an inverting input terminal of the dual operational amplifier U4 is connected to the output rectifying and filtering circuit 6, a non-inverting input terminal of the dual operational amplifier U4 is connected to an output terminal of the transformer, an output terminal of the dual operational amplifier U4 is connected to an emitting terminal of the optical coupler U3, and a receiving terminal of the optical coupler U3 is connected to the fifth pin of the second IC chip U2. The dual operational amplifier U4 can receive and amplify the input current of the output rectifying filter circuit 6, and the transmitting end of the optical coupler U3 emits a certain wavelength, so that the receiving end of the optical coupler U3 is illuminated to conduct the current. Because the input and the output of opto-coupler U3 are kept apart each other, the signal of telecommunication has one-way transmissibility for negative feedback circuit 8 has good interference killing feature and electric insulating ability, job stabilization, and transmission efficiency is high, and control is accurate.
By adopting the technical schemes, the utility model can reduce the power loss and improve the power conversion efficiency through the power correction function of the PFC booster circuit, the LLC half-bridge circuit can reduce the turn-on loss of the field effect tube and the turn-off loss of the output diode, and the overall efficiency is improved; the output rectifying filter circuit can output current in a constant voltage mode, the rear stage is connected with the DC-DC output current-equalizing circuit, and through the regulation effect of five independent shunting and parallel resistor groups of the DC-DC output current-equalizing circuit, the LED lamps in each group can keep different current parameters, the brightness is stable, and the light attenuation of the LED lamps is avoided; meanwhile, a mode that five groups of independent LED lamps drive a power circuit is adopted, each group of LED lamps can be independently disassembled, assembled and maintained, and the maintenance is convenient; the whole power supply circuit has low energy consumption, high power conversion efficiency and long service life, and can be popularized and used.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A high-power supply circuit of LED illumination with five-way output is characterized by comprising:
the alternating current input filter circuit is used for absorbing high surge energy and lightning stroke energy superposed by a power grid and avoiding transmitting the high surge energy and the lightning stroke energy to a rear stage to cause the power supply to lose efficacy;
the PFC boost circuit is used for correcting the phase of the input current and the voltage and enabling the input current to change along with the input voltage, and the boost control circuit is used for controlling the PFC boost circuit;
the LLC half-bridge circuit is used for controlling a circuit switch and the half-bridge control circuit is used for controlling the LLC half-bridge circuit;
the output rectifying and filtering circuit is used for converting the alternating current after voltage reduction into direct current to be supplied to a post-stage circuit;
the negative feedback circuit is used for controlling the voltage and the current;
the DC-DC output current equalizing circuit is used for balancing each external LED lamp group and the transformer;
wherein, the input end of the AC input filter circuit is connected with a mains supply, the input end of the PFC booster circuit is connected with the output end of the AC input filter circuit, the input end of the boost control circuit is connected with the first output end of the PFC booster circuit, the second output end of the PFC booster circuit is connected with the input end of the LLC half-bridge circuit, the first input end of the LLC half-bridge circuit is connected with the first output end of the LLC half-bridge circuit, the second output end of the LLC half-bridge circuit and the output end of the half-bridge circuit are respectively connected with the input end of the transformer, the input end of the output rectifying filter circuit is connected with the first output end of the transformer, the first input end of the negative feedback circuit is connected with the second output end of the transformer, the second input end of the negative feedback circuit is connected with the first output end of the output rectifying filter circuit, and, and the second output end of the output rectifying and filtering circuit is connected with the input end of the DC-DC output current equalizing circuit.
2. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the alternating current input filter circuit comprises a surge current suppression circuit, an EMC filter circuit and a full-wave bridge rectifier circuit, the surge current suppression circuit is connected with a mains input end, an input end of the EMC filter circuit is connected with an output end of the surge current suppression circuit, an input end of the full-wave bridge rectifier circuit is connected with an output end of the EMC filter circuit, and an output end of the full-wave bridge rectifier circuit is connected with an input end of the PFC booster circuit.
3. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the PFC boost circuit comprises L4, D1, D2 and Q1, wherein the input end of the L4 is connected with the output end of the alternating current input filter circuit, the positive electrode of the D2 is connected with the output end of the L4, the positive electrode of the D1 is connected with the input end of the L4, the negative electrode of the D1 is connected with the negative electrode of the D2, and the drain electrode of the Q1 is connected with the negative electrode of the D2.
4. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the boost control circuit comprises a U1, a first pin of the U1 is connected with an output end of the PFC boost circuit, a third pin of the U1 is connected with an input end of the PFC boost circuit, a fourth pin and a seventh pin of the U1 are respectively connected with a grid of a Q1, and a fifth pin of the U1 is connected with an L4.
5. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the LLC half-bridge circuit comprises Q2, Q3 and C5, wherein the drain of Q2 is connected with the output end of the PFC boost circuit, the source of Q2 is connected with the drain of Q3, the gate of Q2 is connected with the first input end of the transformer, the source of Q3 is connected with the second input end of the transformer, and the gate of Q3 is connected with the input end of the half-bridge control circuit.
6. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the half-bridge control circuit comprises a U2, a fifteenth pin of the U2 is connected with a gate of Q2, and an eleventh pin of the U2 is connected with a gate of Q3.
7. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the output rectifying and filtering circuit comprises D4, C8, C9 and C44, wherein the C8, the C9 and the C44 are connected in parallel respectively, a first end of the D4 is connected with a power transformer, a second end of the D4 is connected with anodes of C8, C9 and C44 respectively, and cathodes of the C8, the C9 and the C44 are connected with a DC-DC output current equalizing circuit respectively.
8. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the negative feedback circuit comprises a U4 and a U3, the inverting input end of the U4 is connected with the output rectifying and filtering circuit respectively, the non-inverting input end of the U4 is connected with the output end of the transformer, the output end of the U4 is connected with the transmitting end of the U3, and the receiving end of the U3 is connected with the fifth pin of the U2.
9. The five-output LED lighting high-power supply circuit according to claim 1, characterized in that: the DC-DC output current-equalizing circuit comprises five identical LED power circuits, the five LED power circuits are respectively connected with an output rectifying filter circuit, each LED power circuit comprises Ls, Ds, a resistor parallel group and a Cout, the input end of the Ls is connected with the output end of the output rectifying filter circuit, the input end of the Ds is connected with the output end of the Ls, the output end of the Ds is connected with the input end of the Cout, a resistor parallel group is connected between the Ds and the Cout, and the output end of the Cout is connected with an external LED lamp.
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| CN201921603732.4U CN210641106U (en) | 2019-09-24 | 2019-09-24 | LED lighting high-power supply circuit with five-way output |
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| CN201921603732.4U CN210641106U (en) | 2019-09-24 | 2019-09-24 | LED lighting high-power supply circuit with five-way output |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11917737B2 (en) | 2021-08-02 | 2024-02-27 | Bio-Rad Laboratories, Inc. | Circuit for sharing current between parallel LEDs or parallel strings of LEDs |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11917737B2 (en) | 2021-08-02 | 2024-02-27 | Bio-Rad Laboratories, Inc. | Circuit for sharing current between parallel LEDs or parallel strings of LEDs |
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