CN117615482A - Linear high PF does not have stroboscopic LED drive circuit and circuit board - Google Patents

Linear high PF does not have stroboscopic LED drive circuit and circuit board Download PDF

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Publication number
CN117615482A
CN117615482A CN202311764874.XA CN202311764874A CN117615482A CN 117615482 A CN117615482 A CN 117615482A CN 202311764874 A CN202311764874 A CN 202311764874A CN 117615482 A CN117615482 A CN 117615482A
Authority
CN
China
Prior art keywords
current source
unit
constant current
diode
electrically connected
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
Application number
CN202311764874.XA
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Chinese (zh)
Inventor
薛涛
李宝
石向前
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Yuanwei Semiconductor Technology Co ltd
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Jiangsu Yuanwei Semiconductor Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jiangsu Yuanwei Semiconductor Technology Co ltd filed Critical Jiangsu Yuanwei Semiconductor Technology Co ltd
Priority to CN202311764874.XA priority Critical patent/CN117615482A/en
Publication of CN117615482A publication Critical patent/CN117615482A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators

Abstract

The invention relates to the technical field of LED driving, and discloses a linear high-PF stroboscopic-free LED driving circuit and a circuit board, wherein the linear high-PF stroboscopic-free LED driving circuit comprises a rectifying unit, a unidirectional conducting unit, an energy storage unit, a constant current source unit, a first resistor and a second resistor; the constant current source unit comprises a first constant current source and a second constant current source; when the circuit is actually used, the rectifying unit is electrically connected with the energy storage unit through the unidirectional conductive unit, the energy storage unit is electrically connected with the first constant current source, the input end of the unidirectional conductive unit is electrically connected with the second constant current source, and the discharging time of the energy storage unit and the discharging current of the energy storage unit can be changed by setting the first resistor and the second resistor, so that the discharging controllability of the energy storage unit is realized.

Description

Linear high PF does not have stroboscopic LED drive circuit and circuit board
Technical Field
The invention relates to the technical field of LED driving, in particular to a linear high-PF stroboflash-free LED driving circuit and a circuit board.
Background
When an LED is used, an LED driving circuit is required to supply a constant current to the LED. The current new European standard (IEC 61000-3-2:2020) puts forward higher requirements on PF and stroboscopic performance of a power supply with power between 5W and 25W, in order to meet the new standard requirements, most of current driving power supplies adopt a driving mode of FIG. 1, in a circuit shown in FIG. 1, two paths of constant current sources, namely a constant current source 203a and a constant current source 203b, are arranged, wherein the constant current source 203a is used for controlling the current flowing through a capacitor 102, and the constant current source 203b is used for controlling the current flowing through an LED load unit 204; in addition, the current output by the rectifier bridge 101 flows through two loops, one loop includes the capacitor 102, the constant current source 203a and the resistor 202, and the other loop includes the LED load unit 204, the constant current source 203b and the resistor 201.
In actual use, for the circuit shown in fig. 1, the capacitor 102 is charged by the current flowing through the capacitor 102, when the voltage output by the rectifier bridge 101 is smaller than the voltage of the capacitor 102, the current input to the capacitor 102 is zero, and at this time, the capacitor 102 discharges the LED load unit 204, so that the current flowing through the LED load unit at the position is unchanged. However, the circuit shown in fig. 1 has the following drawbacks in practical use:
firstly, the current time of the LED load unit 204 at the position of the capacitor 102 is longer, and the capacity of all the capacitors 102 is larger; secondly, since the voltages at the two ends of the capacitor 102 cannot be suddenly changed, the capacitor 102 is equivalent to a short circuit at the moment of first power-on, and the constant current source 203a bears high voltage stress; finally, when the output voltage of the rectifier bridge is smaller than the voltage of the capacitor 102, the capacitor 102 starts to discharge, so that the starting discharge time of the capacitor 102 is not controllable.
Disclosure of Invention
In view of the shortcomings of the background technology, the invention provides a linear high-PF stroboflash-free LED driving circuit and a circuit board, and aims to solve the technical problems that the discharge time of a capacitor in the driving mode of the traditional LED driving power supply is not adjustable and the waveform test of European standard IEC 61000-3-2.7.4.3 is not easy to pass.
In order to solve the technical problems, in a first aspect, the present invention provides the following technical solutions: a linear high PF stroboflash-free LED driving circuit comprises a rectifying unit, a unidirectional conducting unit, an energy storage unit, a constant current source unit, a first resistor and a second resistor; the constant current source unit comprises a first constant current source and a second constant current source;
the positive output end of the rectifying unit is respectively connected with the input end of the unidirectional conducting unit and the input end of the second constant current source, the output end of the unidirectional conducting unit is respectively electrically connected with the charging end of the energy storage unit and the input end of the first constant current source, and the grounding end of the energy storage unit is electrically connected with the negative output end of the rectifying unit;
the output end of the second constant current source is electrically connected with one end of the first resistor, the output end of the first constant current source is electrically connected with the other end of the first resistor and one end of the second resistor respectively, the reference end of the first constant current source and the reference end of the second constant current source are electrically connected with the other end of the second resistor respectively, and the other end of the second resistor is used for outputting driving current.
In certain embodiments of the first aspect, the rectifying unit includes a diode D1, a diode D2, a diode D3, and a diode D4; the anode of the diode D1 is electrically connected with the cathode of the diode D4 and is used for being connected with an alternating voltage as the positive output end of the rectifying unit, the cathode of the diode D1 is electrically connected with the cathode of the diode D2, the anode of the diode D2 is electrically connected with the cathode of the diode D3, and the anode of the diode D3 is electrically connected with the anode of the diode D4 and is the negative output end of the rectifying unit.
In a certain embodiment of the first aspect, the unidirectional conductive unit includes a diode D5, an anode of the diode D5 and an input terminal of the unidirectional conductive unit, and a cathode of the diode D5 is an output terminal of the unidirectional conductive unit.
In a certain embodiment of the first aspect, the present invention further includes an ac current source electrically connected to the rectifying unit, for providing an ac voltage to the rectifying unit, and the rectifying unit converts the ac voltage into a dc voltage.
In a certain implementation manner of the first aspect, the invention further comprises an LED load unit, the other end of the second resistor is electrically connected with the input end of the LED load unit, and the output end of the LED load unit is electrically connected with the negative output end of the rectifying unit.
In a certain implementation manner of the first aspect, the LED load unit includes at least two LED lamps, all the LED lamps are sequentially connected in series, an anode of the first LED lamp is an input end of the LED load unit, and a cathode of the terminal LED lamp is an output end of the LED load unit.
In a certain implementation manner of the first aspect, the first constant current source and the second constant current source are packaged in a same chip.
In a certain implementation manner of the first aspect, the first constant current source, the second constant current source and the unidirectional conductive unit are packaged in the same chip.
In a certain implementation manner of the first aspect, the first constant current source, the second constant current source, the unidirectional conducting unit and the rectifying unit are packaged in the same chip.
In a second aspect, the invention further provides a circuit board, and the circuit board is provided with the linear high-PF strobe-free LED driving circuit.
Compared with the prior art, the invention has the following beneficial effects: according to the circuit, the rectifying unit is electrically connected with the energy storage unit through the unidirectional conductive unit, the energy storage unit is electrically connected with the first constant current source, the input end of the unidirectional conductive unit is electrically connected with the second constant current source, and the discharging time of the energy storage unit and the discharging current of the energy storage unit can be changed through the arrangement of the first resistor and the second resistor, so that the discharging controllability of the energy storage unit is realized.
Drawings
FIG. 1 is a schematic diagram of a driving structure of a conventional driving power supply;
FIG. 2 is a first circuit diagram of the circuit of the present invention;
FIG. 3 is a second circuit diagram of the circuit of the present invention;
FIG. 4 is a third circuit diagram of the circuit of the present invention;
fig. 5 is a waveform diagram of voltage and current of the circuit of fig. 1.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
As shown in fig. 2, a linear high PF strobe-free LED driving circuit includes a rectifying unit 1, a unidirectional conducting unit 2, an energy storage unit 3, a constant current source unit 4, a first resistor R1 and a second resistor R2; the constant current source unit 4 includes a first constant current source 4a and a second constant current source 4b;
the positive output end of the rectifying unit 1 is respectively connected with the input end of the unidirectional conducting unit 2 and the input end of the second constant current source 4b, the output end of the unidirectional conducting unit 2 is respectively and electrically connected with the charging end of the energy storage unit 3 and the input end of the first constant current source 4a, and the grounding end of the energy storage unit 3 is electrically connected with the negative output end of the rectifying unit 1; in fig. 2, the energy storage unit 3 is a capacitor C1;
the output end of the second constant current source 4b is electrically connected with one end of the first resistor R1, the output end of the first constant current source 4a is electrically connected with the other end of the first resistor R1 and one end of the second resistor R2 respectively, the reference end of the first constant current source 4a and the reference end of the second constant current source 4b are electrically connected with the other end of the second resistor R2 respectively, and the other end of the second resistor R2 is used for outputting driving current.
When in actual use, the driving current is input to an external LED load to supply power, so that the LED load emits light.
Specifically, in fig. 2, the rectifying unit 1 is a full-bridge rectifying structure, including a diode D1, a diode D2, a diode D3, and a diode D4; the anode of the diode D1 is electrically connected with the cathode of the diode D4 and is used for being connected with an alternating voltage as the positive output end of the rectifying unit, the cathode of the diode D1 is electrically connected with the cathode of the diode D2, the anode of the diode D2 is electrically connected with the cathode of the diode D3, and the anode of the diode D3 is electrically connected with the anode of the diode D4 and is the negative output end of the rectifying unit.
Specifically, in fig. 2, the unidirectional conductive unit 2 includes a diode D5, an anode of the diode D5 and an input terminal of the unidirectional conductive unit 2, and a cathode of the diode D5 is an output terminal of the unidirectional conductive unit 2.
In addition, in fig. 2, the present invention further includes an AC current source AC, which is electrically connected to the rectifying unit 1, to provide an AC voltage to the rectifying unit 1, and the rectifying unit 1 converts the AC voltage into a dc voltage. In actual use, the AC voltage provided by the AC current source AC will be different according to the use region.
In addition, in fig. 1, the invention further includes an LED load unit 5, the other end of the second resistor R2 is electrically connected to the input end of the LED load unit 5, and the output end of the LED load unit 5 is electrically connected to the negative output end of the rectifying unit 1.
The LED load unit 5 comprises at least two LED lamps, all the LED lamps are sequentially connected in series, the anode of the head end LED lamp is the input end of the LED load unit 5, and the cathode of the tail end LED lamp is the output end of the LED load unit 5. In actual use, as the number of LED lamps of the LED load unit 5 increases, the voltage input to the LED load unit 5 needs to be greater to illuminate the LED load unit 5.
The circuit shown in fig. 1 was analyzed as follows:
first, the voltage and current waveforms of the circuit shown in fig. 1 are shown in fig. 5, wherein the sinusoidal waveform is the waveform of the output voltage of the rectifying unit 1, vled is the threshold voltage at which the LED load unit 5 starts conducting, iled is the current flowing through the LED load unit 5, when the output voltage of the rectifying unit 1 is lower than Vled, the capacitor C1 has no current input, the capacitor C1 can be selectively discharged at time t3 or t4 by setting the first resistor R1 and the second resistor R2 until time t5, the circuit shown in fig. 1 starts to discharge at time t3, and the discharge current is relatively large because the circuit shown in fig. 1 always discharges the LED load unit 5, the required capacitance value is large, and the overall discharge time of the capacitor of the present invention is small when the capacitor starts to discharge at time t4, and the discharge current becomes small, so the required capacitance value is small.
In addition, the current of the LED load unit 5 is determined by the first constant current source 4a and the resistor R2, assuming that the reference voltage of the first constant current source 4a is Vrefa, the reference voltage of the second current source 4b is Vrefb, and Vrefa is greater than Vrefb.
When (when)Capacitor C1 begins to discharge at t 4;
when (when)At the time, the capacitor C1 starts to discharge at t3, and the discharge current is equal to +.>Determination of
In addition, the new Europe standard requires that the maximum value of the input current lin occurs before 65 degrees, and referring to FIG. 5, the input maximum current occurs near the valley (VC-V) where the capacitor C3 discharges, and the lower the voltage of VC-V, the smaller the angle at which the input maximum current occurs. According to the VC-V voltage value, the discharging current of the capacitor C1 at the time t3 is changed by changing the resistance value of the resistor R1, so that the VC-V voltage value is close to the load Vled voltage, and the smaller the angle of the input maximum current is.
In addition, in actual use, the first constant current source 4a and the second constant current source 4b are packaged in the same chip. Alternatively still, referring to fig. 2, the first constant current source 4a, the second constant current source 4b, and the unidirectional conductive cell 2 may be packaged in the same chip. Still alternatively, referring to fig. 4, the first constant current source 4a, the second constant current source 4b, the unidirectional conductive unit 2, and the rectifying unit 1 are packaged in the same chip.
In this embodiment, the invention further provides a circuit board, and the circuit board is provided with the linear high-PF strobe-free LED driving circuit.
The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a portable electronic device capable of performing various changes and modifications without departing from the scope of the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (10)

1. The linear high-PF stroboflash-free LED driving circuit is characterized by comprising a rectifying unit, a unidirectional conducting unit, an energy storage unit, a constant current source unit, a first resistor and a second resistor; the constant current source unit comprises a first constant current source and a second constant current source;
the positive output end of the rectifying unit is respectively connected with the input end of the unidirectional conducting unit and the input end of the second constant current source, the output end of the unidirectional conducting unit is respectively electrically connected with the charging end of the energy storage unit and the input end of the first constant current source, and the grounding end of the energy storage unit is electrically connected with the negative output end of the rectifying unit;
the output end of the second constant current source is electrically connected with one end of the first resistor, the output end of the first constant current source is electrically connected with the other end of the first resistor and one end of the second resistor respectively, the reference end of the first constant current source and the reference end of the second constant current source are electrically connected with the other end of the second resistor respectively, and the other end of the second resistor is used for outputting driving current.
2. The linear high PF strobe-free LED driving circuit as claimed in claim 1, wherein said rectifying unit includes a diode D1, a diode D2, a diode D3 and a diode D4; the anode of the diode D1 is electrically connected with the cathode of the diode D4 and is used for being connected with an alternating voltage as the positive output end of the rectifying unit, the cathode of the diode D1 is electrically connected with the cathode of the diode D2, the anode of the diode D2 is electrically connected with the cathode of the diode D3, and the anode of the diode D3 is electrically connected with the anode of the diode D4 and is the negative output end of the rectifying unit.
3. The linear high PF strobe-free LED driving circuit as claimed in claim 1, wherein said unidirectional conductive element comprises a diode D5, an anode of the diode D5 and an input terminal of the unidirectional conductive element, and a cathode of the diode D5 is an output terminal of the unidirectional conductive element.
4. The linear high PF strobe-free LED driving circuit as claimed in claim 1, further comprising an ac current source electrically connected to the rectifying unit for supplying an ac voltage to the rectifying unit, the rectifying unit converting the ac voltage into a dc voltage.
5. The linear high-PF strobe-free LED driving circuit as claimed in claim 1, further comprising an LED load unit, wherein the other end of the second resistor is electrically connected to an input terminal of the LED load unit, and an output terminal of the LED load unit is electrically connected to a negative output terminal of the rectifying unit.
6. The linear high-PF strobe-free LED driving circuit as claimed in claim 5, wherein the LED load unit comprises at least two LED lamps, all the LED lamps are sequentially connected in series, an anode of a head LED lamp is an input end of the LED load unit, and a cathode of a tail LED lamp is an output end of the LED load unit.
7. The linear high PF strobe-free LED driving circuit as claimed in any one of claims 1 to 6, wherein said first constant current source and said second constant current source are packaged in the same chip.
8. The linear high PF strobe-free LED driving circuit as claimed in any one of claims 1 to 6, wherein said first constant current source, second constant current source and unidirectional conductive unit are packaged in the same chip.
9. The linear high PF strobe-free LED driving circuit as claimed in any one of claims 1 to 6, wherein the first constant current source, the second constant current source, the unidirectional current conducting unit and the rectifying unit are packaged in the same chip.
10. A circuit board, characterized in that the circuit board is provided with a linear high PF strobe-free LED driving circuit according to any one of claims 1 to 9.
CN202311764874.XA 2023-12-19 2023-12-19 Linear high PF does not have stroboscopic LED drive circuit and circuit board Pending CN117615482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311764874.XA CN117615482A (en) 2023-12-19 2023-12-19 Linear high PF does not have stroboscopic LED drive circuit and circuit board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311764874.XA CN117615482A (en) 2023-12-19 2023-12-19 Linear high PF does not have stroboscopic LED drive circuit and circuit board

Publications (1)

Publication Number Publication Date
CN117615482A true CN117615482A (en) 2024-02-27

Family

ID=89959895

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311764874.XA Pending CN117615482A (en) 2023-12-19 2023-12-19 Linear high PF does not have stroboscopic LED drive circuit and circuit board

Country Status (1)

Country Link
CN (1) CN117615482A (en)

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