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CN-122002665-A - Driving circuit of LED lighting device

CN122002665ACN 122002665 ACN122002665 ACN 122002665ACN-122002665-A

Abstract

A driving circuit of a light emitting diode lighting device comprises an input circuit, a multiplexing circuit, a constant current driving circuit and an isolated flyback constant voltage circuit. The input circuit is connected with a power supply and outputs a driving current. The multiplexing circuit is connected with the input circuit. The constant current driving circuit is connected with the multiplexing circuit and the light source. The isolation flyback constant voltage circuit is connected with the multiplexing circuit and the intelligent module. Wherein the driving current drives the constant current driving circuit to supply power to the light source. In addition, the multiplexing circuit is charged by the driving current, so that the multiplexing circuit drives the isolated flyback constant voltage circuit to supply power for the intelligent module.

Inventors

  • LIU CHUNMING

Assignees

  • 厦门普为光电科技有限公司

Dates

Publication Date
20260508
Application Date
20260214

Claims (10)

  1. 1. A light emitting diode lighting device driving circuit, comprising: The input circuit is connected with the power supply and used for outputting driving current; the multiplexing circuit is connected with the input circuit; A constant current drive circuit connected with the multiplexing circuit and the light source, and The isolation flyback constant voltage circuit is connected with the multiplexing circuit and the intelligent module; The driving current is used for driving the constant current driving circuit to supply power for the light source, and the driving current is used for charging the multiplexing circuit, so that the multiplexing circuit drives the isolated flyback constant voltage circuit to supply power for the intelligent module.
  2. 2. The led lighting device driving circuit of claim 1, wherein the multiplexing circuit comprises a first diode, a first capacitor and a bleeder resistor, wherein one end of the first diode is connected to a first node, the other end of the first diode is connected to a second node, one end of the first capacitor is connected to the second node, the other end of the first capacitor is connected to a ground point, one end of the bleeder resistor is connected to the first node, the other end of the bleeder resistor is connected to the second node, a first output of the input circuit is connected to the first node, a second output of the input circuit is connected to the ground point, a first input of the constant current driving circuit is connected to the first node, a second input of the constant current driving circuit is connected to the ground point, a first input of the isolated flyback constant voltage circuit is connected to the second node, and a second input of the constant current driving circuit is connected to the ground point.
  3. 3. The led lighting device driving circuit of claim 2, wherein when the input circuit is not connected to a power source, the discharge current of the first capacitor is output to the constant current driving circuit through the bleeder resistor.
  4. 4. The led lighting device driver circuit of claim 1, wherein the input circuit comprises a rectifying circuit.
  5. 5. The led lighting device driving circuit of claim 4, wherein the input circuit further comprises a surge absorption circuit and an electromagnetic interference suppression circuit, the rectifying circuit is connected to the surge absorption circuit, the surge absorption circuit is connected to the electromagnetic interference suppression circuit, and the electromagnetic interference suppression circuit is connected to the multiplexing circuit.
  6. 6. The led lighting device driving circuit of claim 5, wherein the rectifying circuit comprises a rectifier and an over-current protection unit, the rectifier being connected to the power supply through the over-current protection unit.
  7. 7. The led lighting device driving circuit of claim 6, wherein the rectifier is a bridge rectifier.
  8. 8. The led lighting device driving circuit of claim 6, wherein the over-current protection unit is a fuse.
  9. 9. The led lighting device driver circuit of claim 1, wherein the constant current driver circuit is an isolated constant current driver circuit.
  10. 10. The led lighting device driver circuit of claim 1, wherein the constant current driver circuit is a non-isolated constant current driver circuit.

Description

Driving circuit of LED lighting device Technical Field The present application relates to a driving circuit for a lighting device, and more particularly, to a driving circuit for a light emitting diode lighting device. Background As technology advances, led lighting devices often incorporate intelligent modules to provide various intelligent functions. Therefore, most intelligent modules require a constant voltage power supply with a very low voltage (5-48V, e.g., 12V) to provide stable operating voltage. However, most of the existing constant voltage power supplies adopt flyback isolation circuits with electrolytic capacitor filtering, the Power Factor (PF) is low (PF < 0.7) and the Total Harmonic Distortion (THD) is high (THD > 50%). When the constant voltage power supply (PF < 0.7) is connected in parallel with the constant current driving power supply (PF > 0.9), harmonic current of the constant voltage power supply can be recharged to the constant current driving power supply, so that total power factor is greatly reduced after the constant voltage power supply is connected in parallel with the constant current driving power supply, and the requirement of international energy efficiency standard (such as the requirement of PF >0.9 of IEC 61000-3-2) cannot be met. Part of the existing light-emitting diode lighting device driving circuits increase the power factor by adding pure resistive devices to the constant current driving power supply, which not only increases the complexity and cost of the light-emitting diode lighting device, but also reduces the efficiency of the light-emitting diode lighting device. Disclosure of Invention According to an embodiment of the present application, a driving circuit of a light emitting diode lighting device is provided, which includes an input circuit, a multiplexing circuit, a constant current driving circuit, and an isolated flyback constant voltage circuit. The input circuit is connected with a power supply and outputs a driving current. The multiplexing circuit is connected with the input circuit. The constant current driving circuit is connected with the multiplexing circuit and the light source. The isolation flyback constant voltage circuit is connected with the multiplexing circuit and the intelligent module. Wherein the driving current drives the constant current driving circuit to supply power to the light source. In addition, the multiplexing circuit is charged by the driving current, so that the multiplexing circuit drives the isolated flyback constant voltage circuit to supply power for the intelligent module. In one embodiment, the multiplexing circuit includes a first diode, a first capacitor, and a bleeder resistor. One end of the first diode is connected with the first node, and the other end of the first diode is connected with the second node. One end of the first capacitor is connected with the second node, and the other end of the first capacitor is connected with the grounding point. One end of the bleeder resistor is connected with the first node, and the other end of the bleeder resistor is connected with the second node. The first output end of the input circuit is connected with the first node, and the second output end of the input circuit is connected with the grounding point. The first input end of the constant current drive circuit is connected with the first node, and the second input end of the constant current drive circuit is connected with the grounding point. The first input end of the isolation flyback constant voltage circuit is connected with the second node, and the second input end of the constant current driving circuit is connected with the grounding point. In an embodiment, when the input circuit is not connected to the power supply, the discharging current of the first capacitor is output to the constant current driving circuit through the discharging resistor. In one embodiment, the input circuit includes a rectifying circuit. In one embodiment, the input circuit further comprises a surge absorbing circuit and an electromagnetic interference suppressing circuit. The rectifying circuit is connected with the surge absorbing circuit. The surge absorbing circuit is connected with the electromagnetic interference suppressing circuit. The electromagnetic interference suppression circuit is connected with the multiplexing circuit. In one embodiment, the rectifying circuit includes a rectifier and an over-current protection unit. The rectifier is connected with a power supply through an overcurrent protection unit. In one embodiment, the rectifier is a bridge rectifier. In one embodiment, the over-current protection unit is a fuse. In one embodiment, the constant current driving circuit is an isolated constant current driving circuit. In one embodiment, the constant current driving circuit is a non-isolated constant current driving circuit. In view of the above, the driving circuit of the led lighting device according to the emb