CN109121253B - Voltage-adjustable LED driving power supply and driving method - Google Patents
Voltage-adjustable LED driving power supply and driving method Download PDFInfo
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- CN109121253B CN109121253B CN201811118139.0A CN201811118139A CN109121253B CN 109121253 B CN109121253 B CN 109121253B CN 201811118139 A CN201811118139 A CN 201811118139A CN 109121253 B CN109121253 B CN 109121253B
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- 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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a voltage-adjustable LED driving power supply and a driving method, wherein the voltage-adjustable LED driving power supply comprises a rectifier, a frequency adjusting circuit, a voltage detection circuit, a brightness detection component, a timing circuit, a starting circuit and a control circuit; the brightness detection component is arranged on the outer side of the LED and used for detecting the light emitting degree of the LED, the output end of the driving power supply is provided with a connecting port, the connecting port is provided with a super capacitor C7, one end of the super capacitor C7 is directly connected with the voltage detection circuit, and the other end of the super capacitor C7 is respectively connected with the voltage detection circuit and the timing circuit through the starting circuit; the output end of the brightness detection component is connected with the control end of the starting circuit, the output ends of the voltage detection circuit and the timing circuit are respectively connected with the control circuit, and the control circuit controls the frequency regulation circuit to regulate the frequency according to the timing of the timing circuit and the voltage detected by the voltage detection circuit. The LED lamp driving circuit can perform rapid voltage regulation according to different LED lamps and is suitable for driving a plurality of LED lamps.
Description
Technical Field
The invention relates to the technical field of LED lighting, in particular to a voltage-adjustable LED driving power supply and a driving method.
Background
With the rapid development of electronic technology, as LEDs have the advantages of high light-emitting efficiency, energy conservation, and the like, the LED lighting technology is becoming mature, and is beginning to be applied to various fields, such as display screens, indicator lights of various instruments, household lighting, and the like. The LEDs use low-voltage dc power, so a driving power supply for the LEDs is required, and the driving power supply can convert high-voltage ac power into low-voltage dc power to supply to the LEDs.
The traditional driving power supply is provided with an input end and an output end, the input end is connected with a household alternating current power supply, then the alternating current power supply is connected with a filter circuit and the like through a rectifier and then is output to an LED, the LED lamp is driven, some transformers are also arranged, a controllable switch tube is arranged on the primary side of the transformer, the switch PWEM control is carried out on the switch through a controller, a PWM controller is used for switching on and off the switch, the direct current is controlled to be switched on and off, a variable magnetic field is generated in the transformer, an output end coil wound on the transformer generates induced potential, the induced potential of the output end coil is output to the output end, and therefore the LED is driven to work.
However, the existing LED driving power supply is only suitable for a single type, such as LEDs with a single voltage range, and when driving the LEDs, the type of the LEDs needs to be manually selected, or the LED lamps need to be set to be connected in series or in parallel to a certain number, and thus the voltage adjustment driving of LEDs with different numbers cannot be adapted.
Disclosure of Invention
The invention provides a voltage-adjustable LED driving power supply, which comprises a rectifier, a frequency adjusting circuit, a voltage detection circuit, a brightness detection component, a timing circuit, a starting circuit and a control circuit, wherein the frequency adjusting circuit is connected with the rectifier; the rectifier is connected with the LED through the frequency adjusting circuit, the brightness detecting component is arranged on the outer side of the LED and used for detecting the light emitting degree of the LED, the output end of the driving power supply is provided with a connecting port, the connecting port is provided with a super capacitor C7, one end of the super capacitor C7 is directly connected with the voltage detecting circuit, and the other end of the super capacitor C7 is respectively connected with the voltage detecting circuit and the timing circuit through the starting circuit; the output end of the brightness detection component is connected with the control end of the starting circuit, the output ends of the voltage detection circuit and the timing circuit are respectively connected with the control circuit, and the control circuit controls the frequency regulation circuit to regulate the frequency according to the timing of the timing circuit and the voltage detected by the voltage detection circuit.
The LED driving power supply also comprises a transformer, a harmonic filtering circuit, a driving circuit and a feedback circuit; the input side of the rectifier is connected with an external AC power supply, the output side of the rectifier is connected with the input side of a frequency adjusting circuit, the output side of the frequency adjusting circuit is connected with the primary winding of the transformer, the secondary winding of the transformer is connected with the input side of a harmonic filtering circuit, and the output side of the harmonic filtering circuit is connected with an LED lamp; the driving circuit and the feedback circuit are connected with the control circuit, and the driving circuit is used for driving the frequency adjusting circuit.
The LED drives the power supply, and the rectifier comprises a full-bridge or half-bridge rectifying circuit formed by combining diodes.
In the LED driving power supply, when the brightness detection component detects that the LED reaches a predetermined value, the start circuit is controlled to be turned on, so that the voltage detection circuit and the timing circuit are started, the voltage detection circuit detects the voltage value of the super capacitor C7 at the time, and the timing circuit performs timing.
The LED driving power supply comprises a frequency adjusting circuit, a power supply circuit and a control circuit, wherein the frequency adjusting circuit comprises a resistor R1, a capacitor C1, a capacitor C2, a resistor R9, a variable resistor R2, an adjustable inductor L1, an adjustable inductor L2, an adjustable resistor L3, a variable resistor R3, an adjustable resistor R4, transistors G1, G2, an adjustable inductor C3, an adjustable inductor C4, an inductor L4, a voltage stabilizing tube W1 and a voltage stabilizing tube W2; the capacitor C1 is connected in parallel to the output end of the rectifier, the resistor R1 is connected in series with the inductor C2 and then connected in parallel with the capacitor C1, the transistors G1 and G2 are connected in series and then connected in parallel with the capacitor C1, one end of the resistor R9 is connected to the series connection point of the resistor R1 and the capacitor C2, the other end of the resistor R9 is connected to one end of the variable resistor R2 and the control end of the transistor G2, and the other end of the variable resistor R2 is grounded; the adjustable inductor L1 is connected in series with the variable resistor R3 and then connected to the control end of the transistor G1, the adjustable inductor L2 is connected in series with the variable resistor R4 and then connected to the control end of the transistor G2, and the driving circuit is respectively connected to the variable control ends of the variable resistors R2, R3 and R4 and the adjustable control ends of the adjustable inductors L1 and L2; the feedback circuit is provided with detection ends on the variable resistors R2, R3 and R4 and the adjustable inductors L1 and L2, and scales adjusted by the adjustable inductors L1 and L2 are detected through the detection ends and the variable resistors R2, R3 and R4 are detected.
The driving circuit comprises a driving transistor, a driving motor and a transmission mechanism, the driving transistor drives the driving motor, and the driving motor drives the transmission mechanism to adjust the adjustable resistors R2, R3 and R4 and the adjustable inductors L1 and L2; the feedback circuit comprises a preset adjusting scale, a detection adjusting scale and a comparator; the detection end receives the detection adjustment scale, the control circuit sets the preset adjustment scale through the preset adjustment scale, the preset adjustment scale and the detection adjustment scale are input into the comparator, the difference value of the preset adjustment scale and the detection adjustment scale is obtained through comparison and judgment, the difference value is compared with a preset scale threshold value, and according to the comparison result, the result is fed back to the control circuit to judge whether the adjustable resistors R2, R3 and R4 and the adjustable inductors L1 and L2 reach preset adjustment positions or not.
A driving method of the adjustable voltage LED driving power supply comprises the following steps:
s1), initializing, and connecting the LED lamp to the connection port;
s2) the control circuit outputs a first control signal to the drive circuit to control the drive power supply to output a first frequency, wherein the first control signal is the drive frequency corresponding to the lowest drive voltage of the drive power supply;
s3) detecting the brightness of the LED in real time through a brightness detection component, gradually increasing second frequencies corresponding to different driving voltages by a control circuit, and sending a first starting signal to a starting circuit by the brightness detection component when the brightness reaches a preset brightness threshold;
s4) voltage detection and time calculation are carried out after the voltage detection circuit and the timer are started, and the voltage and the time are sent to the control circuit, the control circuit carries out processing according to the received voltage and time, a first voltage intermediate value is obtained, and a first control frequency is calculated according to the first voltage intermediate value;
s5) reducing the grade step by step according to the time, increasing the third frequency corresponding to different driving voltages step by step according to the reduced grade, processing according to the step S4), obtaining a second voltage intermediate value, and calculating a second control frequency according to the first voltage intermediate value;
s6) repeating the step S5), obtaining an Nth voltage intermediate value, and calculating an Nth control frequency according to the Nth voltage intermediate value;
s7) sequentially comparing the first control frequency and the second control frequency until the Nth control frequency corresponds to the LED brightness and the heating degree, selecting the control frequency corresponding to the lowest weighted value of the LED brightness and the heating degree as the control frequency for driving the LED, and selecting the corresponding voltage intermediate value under the control frequency as the output voltage of the driving power supply.
In the driving method, the preset luminance threshold in step S3) includes: when the driving frequency corresponding to the lowest driving voltage cannot light the LED lamp, adjusting the frequency according to the grade, and using the driving frequency as a preset brightness threshold value when the LED lamp is lighted; and when the LED lamp can be lightened by the driving frequency corresponding to the lowest driving voltage, selecting the brightness of the driving voltage increased by at least one grade as a preset brightness threshold value.
In the driving method, N is between 5 and 10.
In the driving method, after the step S7), the driving circuit is controlled to adjust the frequency adjusting circuit, the adjusting result of the frequency adjusting circuit is fed back through the feedback circuit, when the frequency adjusting circuit does not meet the adjusting requirement, the control circuit calculates the difference which does not meet the adjusting requirement, outputs a difference control signal according to the difference, controls the frequency adjusting circuit to adjust once again, and locks the components in the adjusted frequency adjusting circuit.
Preferably, the LED driving power supply is arranged in a modularized integration mode, is connected with LEDs of different types through a connecting port, is connected with a power grid or other external power supplies through a power port, automatically detects driving voltage required by the LEDs inside, and enables the driving power supply to realize accurate and rapid driving of the LEDs of different types and different voltage grades through a plug-in mode.
The beneficial technical effects obtained by the invention are as follows: the invention can adjust and control the voltage according to the LED lamps with different numbers, meet the drive of various types of LEDs, quickly find the optimal driving voltage for controlling the driving power supply through the frequency approximation mode of the control voltage, so that the LED lamps can be controlled to be lightened under the optimal light emitting and heating conditions, the driving power supply can be arranged in different LED lamps in a modularized mode, the voltage of the LED lamps is controlled tentatively, the frequency is adjusted, the primary adjustment and the feedback adjustment of the driving circuit and the feedback circuit are used for ensuring the accuracy of the voltage output after the frequency is adjusted, one of the main improvement points of the invention is that the resonant frequency output to the LED is adjusted through the adjustable resistance and the variable inductance, and the invention has better effect of tracking and controlling the frequency of the driving LED compared with the existing fixed resonant frequency control, the double-layer frequency control is carried out by adjusting the resonance output to the transformer and adjusting the switching frequency for controlling the on-off of the transformer.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. In the drawings, like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a preferred schematic diagram of the LED driving power supply of the present invention.
Fig. 2 is a preferred schematic diagram of the driving method of 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 further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The first embodiment is as follows:
fig. 1 is a schematic diagram of a preferred LED driving power supply of the present invention. The device comprises a rectifier, a frequency adjusting circuit, a voltage detection circuit, a brightness detection component, a timing circuit, a starting circuit and a control circuit; the rectifier is connected with the LED through the frequency adjusting circuit, the brightness detecting component is arranged on the outer side of the LED and used for detecting the light emitting degree of the LED, the output end of the driving power supply is provided with a connecting port, the connecting port is provided with a super capacitor C7, one end of the super capacitor C7 is directly connected with the voltage detecting circuit, and the other end of the super capacitor C7 is respectively connected with the voltage detecting circuit and the timing circuit through the starting circuit; the output end of the brightness detection component is connected with the control end of the starting circuit, the output ends of the voltage detection circuit and the timing circuit are respectively connected with the control circuit, and the control circuit controls the frequency regulation circuit to regulate the frequency according to the timing of the timing circuit and the voltage detected by the voltage detection circuit.
Preferably, the starting circuit comprises a high-power switching tube such as a darlington tube and a relay, and can also be a switch device for isolation control such as an optical coupler.
The LED driving power supply also comprises a transformer, a harmonic filtering circuit, a driving circuit and a feedback circuit; the input side of the rectifier is connected with an external AC power supply, the output side of the rectifier is connected with the input side of a frequency adjusting circuit, the output side of the frequency adjusting circuit is connected with the primary winding of the transformer, the secondary winding of the transformer is connected with the input side of a harmonic filtering circuit, and the output side of the harmonic filtering circuit is connected with an LED lamp; the driving circuit and the feedback circuit are connected with the control circuit, and the driving circuit is used for driving the frequency adjusting circuit.
The LED drives the power supply, and the rectifier comprises a full-bridge or half-bridge rectifying circuit formed by combining diodes.
In the LED driving power supply, when the brightness detection component detects that the LED reaches a predetermined value, the start circuit is controlled to be turned on, so that the voltage detection circuit and the timing circuit are started, the voltage detection circuit detects the voltage value of the super capacitor C7 at the time, and the timing circuit performs timing.
The LED driving power supply comprises a frequency adjusting circuit, a power supply circuit and a control circuit, wherein the frequency adjusting circuit comprises a resistor R1, a capacitor C1, a capacitor C2, a resistor R9, a variable resistor R2, an adjustable inductor L1, an adjustable inductor L2, an adjustable resistor L3, a variable resistor R3, an adjustable resistor R4, transistors G1, G2, an adjustable inductor C3, an adjustable inductor C4, an inductor L4, a voltage stabilizing tube W1 and a voltage stabilizing tube W2; the capacitor C1 is connected in parallel to the output end of the rectifier, the resistor R1 is connected in series with the inductor C2 and then connected in parallel with the capacitor C1, the transistors G1 and G2 are connected in series and then connected in parallel with the capacitor C1, one end of the resistor R9 is connected to the series connection point of the resistor R1 and the capacitor C2, the other end of the resistor R9 is connected to one end of the variable resistor R2 and the control end of the transistor G2, and the other end of the variable resistor R2 is grounded; the adjustable inductor L1 is connected in series with the variable resistor R3 and then connected to the control end of the transistor G1, the adjustable inductor L2 is connected in series with the variable resistor R4 and then connected to the control end of the transistor G2, and the driving circuit is respectively connected to the variable control ends of the variable resistors R2, R3 and R4 and the adjustable control ends of the adjustable inductors L1 and L2; the feedback circuit is provided with detection ends on the variable resistors R2, R3 and R4 and the adjustable inductors L1 and L2, and scales adjusted by the adjustable inductors L1 and L2 are detected through the detection ends and the variable resistors R2, R3 and R4 are detected.
The driving circuit comprises a driving transistor, a driving motor and a transmission mechanism, the driving transistor drives the driving motor, and the driving motor drives the transmission mechanism to adjust the adjustable resistors R2, R3 and R4 and the adjustable inductors L1 and L2; the feedback circuit comprises a preset adjusting scale, a detection adjusting scale and a comparator; the detection end receives the detection adjustment scale, the control circuit sets the preset adjustment scale through the preset adjustment scale, the preset adjustment scale and the detection adjustment scale are input into the comparator, the difference value of the preset adjustment scale and the detection adjustment scale is obtained through comparison and judgment, the difference value is compared with a preset scale threshold value, and according to the comparison result, the result is fed back to the control circuit to judge whether the adjustable resistors R2, R3 and R4 and the adjustable inductors L1 and L2 reach preset adjustment positions or not.
Fig. 2 is a preferred schematic diagram of the driving method of the present invention. A driving method of the adjustable voltage LED driving power supply comprises the following steps:
s1), initializing, and connecting the LED lamp to the connection port;
s2) the control circuit outputs a first control signal to the drive circuit to control the drive power supply to output a first frequency, wherein the first control signal is the drive frequency corresponding to the lowest drive voltage of the drive power supply;
s3) detecting the brightness of the LED in real time through a brightness detection component, gradually increasing second frequencies corresponding to different driving voltages by a control circuit, and sending a first starting signal to a starting circuit by the brightness detection component when the brightness reaches a preset brightness threshold;
s4) voltage detection and time calculation are carried out after the voltage detection circuit and the timer are started, and the voltage and the time are sent to the control circuit, the control circuit carries out processing according to the received voltage and time, a first voltage intermediate value is obtained, and a first control frequency is calculated according to the first voltage intermediate value;
s5) reducing the grade step by step according to the time, increasing the third frequency corresponding to different driving voltages step by step according to the reduced grade, processing according to the step S4), obtaining a second voltage intermediate value, and calculating a second control frequency according to the first voltage intermediate value;
s6) repeating the step S5), obtaining an Nth voltage intermediate value, and calculating an Nth control frequency according to the Nth voltage intermediate value;
s7) sequentially comparing the first control frequency and the second control frequency until the Nth control frequency corresponds to the LED brightness and the heating degree, selecting the control frequency corresponding to the lowest weighted value of the LED brightness and the heating degree as the control frequency for driving the LED, and selecting the corresponding voltage intermediate value under the control frequency as the output voltage of the driving power supply.
In the driving method, the preset luminance threshold in step S3) includes: when the driving frequency corresponding to the lowest driving voltage cannot light the LED lamp, adjusting the frequency according to the grade, and using the driving frequency as a preset brightness threshold value when the LED lamp is lighted; and when the LED lamp can be lightened by the driving frequency corresponding to the lowest driving voltage, selecting the brightness of the driving voltage increased by at least one grade as a preset brightness threshold value.
In the driving method, N is between 5 and 10.
In the driving method, after the step S7), the driving circuit is controlled to adjust the frequency adjusting circuit, the adjusting result of the frequency adjusting circuit is fed back through the feedback circuit, when the frequency adjusting circuit does not meet the adjusting requirement, the control circuit calculates the difference which does not meet the adjusting requirement, outputs a difference control signal according to the difference, controls the frequency adjusting circuit to adjust once again, and locks the components in the adjusted frequency adjusting circuit.
Preferably, the LED driving power supply is arranged in a modularized integration mode, is connected with LEDs of different types through a connecting port, is connected with a power grid or other external power supplies through a power port, automatically detects driving voltage required by the LEDs inside, and enables the driving power supply to realize accurate and rapid driving of the LEDs of different types and different voltage grades through a plug-in mode.
Preferably, the frequency adjustment circuit further includes variable capacitors C3, C4, an adjustable inductor L3, and an inductor L4, one end of the variable capacitor C3 is connected to one end of the capacitor C1, the other end of the variable capacitor C3 is connected to one end of the variable capacitor L3, the other end of the variable capacitor L3 is connected to one end of the variable capacitor C4, and the capacitor C4 is connected to one end of the variable inductor L1 through the inductor L4; the variable capacitor C4 is connected in parallel across the primary winding of the transformer T1.
Preferably, a first current detection circuit CT1 is further connected in series between the variable capacitor C4 and the inductor L4, the first current detection circuit CT1 is a current transformer, an input end of the first current detection circuit CT1 is connected in series between the variable capacitor C4 and the inductor L4, an output end of the first current detection circuit CT1 is connected with a diode D1, an output end of the first current detection circuit CT1 is connected with a resistor R5 and a capacitor C5 in series, and a circuit after the parallel connection is connected with an input end of the current mirror circuit through a resistor R6.
The driving circuit and the feedback circuit are connected with variable capacitors C3 and C4 and an adjustable inductor L3 (not shown in the figure).
Preferably, an output end of the secondary winding of the transformer T1 is connected to an anode of a diode D3, a cathode of the diode D3 is connected to one end of an inductor L5, the other end of the inductor L5 is connected to at least one LED lamp, a second current detection circuit CT2 is connected in series between the LED lamp and the other output end of the secondary winding of the transformer T1, the second current detection circuit CT2 is a current transformer, the output end is connected to a diode D2, the output end is connected in series with the diode D2 and then connected to a resistor R7 and a capacitor C7 in parallel, and the circuit after parallel connection is connected to the other input end of the current mirror circuit through a resistor R8.
Example two:
preferably, the super capacitor C7 can be replaced by a storage battery.
Preferably, the output end of the super capacitor C7 or the storage battery is provided with a controllable charging circuit, and the output end is provided with a controllable discharging circuit and a DC conversion circuit, and the controllable charging circuit and the DC conversion circuit are connected to the connection port through the discharging circuit, so as to avoid that the lowest driving voltage of the driving power supply is higher than the maximum voltage of the LED, and the controllable discharging circuit and the DC conversion circuit can perform time-sharing discharging or voltage conversion according to the voltage grade, so as to meet the requirement of voltage regulation of the driving LED. The structure of the other driving power supplies is the same as the first embodiment, and will not be described in detail here.
A driving method of the adjustable voltage LED driving power supply comprises the following steps:
s1), initializing, and connecting the LED lamp to the connection port;
s2) the control circuit outputs a first control signal to the drive circuit to control the drive power supply to output a first frequency, and the control circuit controls the controllable charging circuit to charge the super capacitor C7 or the storage battery; the first control signal is a driving frequency corresponding to the lowest driving voltage of the driving power supply;
s3) controlling the controllable discharging circuit to conduct instant short-time connection, and estimating the range of the LED voltage grade;
s4) detecting the brightness of the LED in real time through a brightness detection component, gradually increasing second frequencies corresponding to different driving voltages by a control circuit, and sending a first starting signal to a starting circuit by the brightness detection component when the brightness reaches a preset brightness threshold;
s5) voltage detection and time calculation are carried out after the voltage detection circuit and the timer are started, and the voltage and the time are sent to the control circuit, the control circuit carries out processing according to the received voltage and time, a first voltage intermediate value is obtained, and a first control frequency is calculated according to the first voltage intermediate value;
s6) reducing the grade step by step according to the time, increasing the third frequency corresponding to different driving voltages step by step according to the reduced grade, processing according to the step S4), obtaining a second voltage intermediate value, and calculating a second control frequency according to the first voltage intermediate value;
s7) repeating the step S5), obtaining an Nth voltage intermediate value, and calculating an Nth control frequency according to the Nth voltage intermediate value;
s8) sequentially comparing the first control frequency and the second control frequency until the Nth control frequency corresponds to the LED brightness and the heating degree, selecting the control frequency corresponding to the lowest weighted value of the LED brightness and the heating degree as the control frequency for driving the LED, and selecting the corresponding voltage intermediate value under the control frequency as the output voltage of the driving power supply.
Other driving methods are similar to the first embodiment and will not be described in detail.
The beneficial technical effects obtained by the invention are as follows: the invention can adjust and control the voltage according to the LED lamps with different numbers, meet the drive of various types of LEDs, quickly find the optimal driving voltage for controlling the driving power supply through the frequency approximation mode of the control voltage, so that the LED lamps can be controlled to be lightened under the optimal light emitting and heating conditions, the driving power supply can be arranged in different LED lamps in a modularized mode, the voltage of the LED lamps is controlled tentatively, the frequency is adjusted, the primary adjustment and the feedback adjustment of the driving circuit and the feedback circuit are used for ensuring the accuracy of the voltage output after the frequency is adjusted, one of the main improvement points of the invention is that the resonant frequency output to the LED is adjusted through the adjustable resistance and the variable inductance, and the invention has better effect of tracking and controlling the frequency of the driving LED compared with the existing fixed resonant frequency control, the double-layer frequency control is carried out by adjusting the resonance output to the transformer and adjusting the switching frequency for controlling the on-off of the transformer.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (10)
1. An adjustable voltage LED driving power supply is characterized by comprising a rectifier, a frequency adjusting circuit, a voltage detection circuit, a brightness detection component, a timing circuit, a starting circuit and a control circuit; the rectifier is connected with an LED lamp through the frequency adjusting circuit, the brightness detecting component is arranged on the outer side of the LED lamp and used for detecting the light emitting degree of the LED lamp, a connecting port is arranged at the output end of the driving power supply, a super capacitor C7 is arranged at the connecting port, one end of the super capacitor C7 is directly connected with the voltage detecting circuit, and the other end of the super capacitor C7 is respectively connected with the voltage detecting circuit and the timing circuit through the starting circuit; the output end of the brightness detection component is connected with the control end of the starting circuit, the output ends of the voltage detection circuit and the timing circuit are respectively connected with the control circuit, and the control circuit controls the frequency regulation circuit to regulate the frequency according to the timing of the timing circuit and the voltage detected by the voltage detection circuit.
2. The LED driving power supply of claim 1, further comprising a transformer, a harmonic filtering circuit, a driving circuit, a feedback circuit; the input side of the rectifier is connected with an external AC power supply, the output side of the rectifier is connected with the input side of a frequency adjusting circuit, the output side of the frequency adjusting circuit is connected with the primary winding of the transformer, the secondary winding of the transformer is connected with the input side of a harmonic filtering circuit, and the output side of the harmonic filtering circuit is connected with an LED lamp; the driving circuit and the feedback circuit are connected with the control circuit, and the driving circuit is used for driving the frequency adjusting circuit.
3. The LED driving power supply according to claim 2, wherein the rectifier comprises a full-bridge or half-bridge rectifier circuit composed of diodes.
4. The LED driving power supply according to claim 2, wherein the brightness detection means controls the start circuit to be turned on to start the voltage detection circuit and the timer circuit when detecting that the brightness of the LED lamp reaches a predetermined value, the voltage detection circuit detects a voltage value of the super capacitor C7 at that time, and the timer circuit performs timing.
5. The LED driving power supply according to claim 4, wherein the frequency adjusting circuit comprises a resistor R1, a capacitor C1, a capacitor C2, a resistor R9, a variable resistor R2, an adjustable inductor L1, an adjustable inductor L2, an adjustable inductor L3, a variable resistor R3, a variable resistor R4, a transistor G1, a transistor G2, an adjustable capacitor C3, an adjustable capacitor C4, an inductor L4, a voltage regulator tube W1, a voltage regulator tube W2; the capacitor C1 is connected in parallel to the output end of the rectifier, the resistor R1 is connected in series with the inductor C2 and then connected in parallel with the capacitor C1, the transistor G1 and the transistor G2 are connected in series and then connected in parallel with the capacitor C1, one end of the resistor R9 is connected to the series connection point of the resistor R1 and the capacitor C2, the other end of the resistor R9 is connected to one end of the variable resistor R2 and the control end of the transistor G2, and the other end of the variable resistor R2 is grounded; the adjustable inductor L1 is connected in series with the variable resistor R3 and then connected to the control end of the transistor G1, the adjustable inductor L2 is connected in series with the variable resistor R4 and then connected to the control end of the transistor G2, and the driving circuit is respectively connected to the variable control ends of the variable resistor R2, the variable resistor R3 and the variable resistor R4, and the adjustable control ends of the adjustable inductor L1 and the adjustable inductor L2; the feedback circuit is characterized in that detection ends are arranged on the variable resistor R2, the variable resistor R3 and the variable resistor R4, the adjustable inductor L1 and the adjustable inductor L2, the detection ends are used for detecting the scales adjusted by the variable resistor R2, the variable resistor R3 and the variable resistor R4, and the adjustable inductor L1 and the adjustable inductor L2.
6. The LED driving power supply according to claim 5, wherein the driving circuit comprises a driving transistor, a driving motor, and a transmission mechanism, the driving transistor drives the driving motor, and the transmission mechanism is driven by the driving motor to adjust the adjustable resistor R2, the adjustable resistor R3, the adjustable resistor R4, the adjustable inductor L1, and the adjustable inductor L2; the feedback circuit comprises a preset adjusting scale, a detection adjusting scale and a comparator; receive through the sense terminal detect adjust the scale, through predetermine and adjust the scale receipt predetermine the regulation scale that control circuit set for, will predetermine and adjust the scale, detect and adjust the scale and input to the comparator, the comparison judgement reachs and predetermines the difference between regulation scale, detection and adjust the scale, and will the difference is compared with predetermine scale threshold value, feeds back according to the comparison result reaches control circuit, in order to judge adjustable resistance R2, adjustable resistance R3, adjustable resistance R4 and adjustable inductance L1, adjustable inductance L2 whether reach predetermined adjusting position.
7. A driving method of the adjustable voltage LED driving power supply according to any one of claims 1-6, characterized by comprising the following steps: s1), initializing, and connecting the LED lamp to the connection port;
s2) the control circuit outputs a first control signal to the drive circuit to control the drive power supply to output a first frequency, wherein the first control signal is the drive frequency corresponding to the lowest drive voltage of the drive power supply;
s3) detecting the brightness of the LED lamp in real time through a brightness detection component, gradually increasing second frequencies corresponding to different driving voltages by a control circuit, and sending a first starting signal to a starting circuit by the brightness detection component when the brightness reaches a preset brightness threshold;
s4) voltage detection and time calculation are carried out after the voltage detection circuit and the timer are started, and the voltage and the time are sent to the control circuit, the control circuit carries out processing according to the received voltage and time, a first voltage intermediate value is obtained, and a first control frequency is calculated according to the first voltage intermediate value;
s5) reducing the grade step by step according to the time, increasing the third frequency corresponding to different driving voltages step by step according to the reduced grade, processing according to the step S4), obtaining a second voltage intermediate value, and calculating a second control frequency according to the first voltage intermediate value; s6) repeating the step S5), obtaining an Nth voltage intermediate value, and calculating an Nth control frequency according to the Nth voltage intermediate value;
s7) sequentially comparing the first control frequency and the second control frequency until the Nth control frequency corresponds to the luminous brightness and the heating degree of the LED lamp, selecting the control frequency corresponding to the lowest weighted value of the luminous brightness and the heating degree of the LED lamp as the control frequency for driving the LED lamp, and selecting the middle value of the voltage corresponding to the control frequency as the output voltage of the driving power supply.
8. The driving method as set forth in claim 7, wherein the preset luminance threshold in the step S3) comprises: when the driving frequency corresponding to the lowest driving voltage cannot light the LED lamp, adjusting the frequency according to the grade, and using the driving frequency as a preset brightness threshold value when the LED lamp is lighted; and when the LED lamp can be lightened by the driving frequency corresponding to the lowest driving voltage, selecting the brightness of the driving voltage increased by at least one grade as a preset brightness threshold value.
9. The driving method as recited in claim 8 wherein said N is between 5 and 10.
10. The driving method as claimed in claim 7, wherein the step S7) is followed by controlling the driving circuit to adjust the frequency adjusting circuit, the adjustment comparison result of the frequency adjusting circuit is fed back through the feedback circuit, when the frequency adjusting circuit does not meet the adjustment requirement, the control circuit calculates the difference that does not meet the adjustment requirement, outputs a difference control signal according to the difference, controls the frequency adjusting circuit to adjust once again, and locks the components in the adjusted frequency adjusting circuit.
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| CN201811118139.0A CN109121253B (en) | 2018-09-26 | 2018-09-26 | Voltage-adjustable LED driving power supply and driving method |
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| CN114639339B (en) * | 2022-01-27 | 2023-09-26 | 南京中感微电子有限公司 | LED display system and multi-path LED driving circuit thereof |
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| CN106879118B (en) * | 2017-03-29 | 2018-10-09 | 华南理工大学 | A kind of condensance balanced type multi-channel LED driving circuit |
| JP2018142551A (en) * | 2018-06-06 | 2018-09-13 | 東芝ライテック株式会社 | Electric power supply and illuminating device |
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