CN107889314B - Touch dimming LED power supply with memory function and its design method - Google Patents
Touch dimming LED power supply with memory function and its design method Download PDFInfo
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- CN107889314B CN107889314B CN201711283333.XA CN201711283333A CN107889314B CN 107889314 B CN107889314 B CN 107889314B CN 201711283333 A CN201711283333 A CN 201711283333A CN 107889314 B CN107889314 B CN 107889314B
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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]
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Abstract
The touch dimming LED power supply comprises a rectification starting circuit, a constant current driving chip, a charging reserve circuit, a compensation circuit, a voltage stabilizing circuit, a touch dimming chip and an LED diode light-emitting circuit, wherein the rectification starting circuit rectifies 220V alternating current into direct current to supply power to the constant current driving chip, so that the constant current driving chip starts to work, the constant current driving chip supplies power to the charging reserve circuit, the charging reserve circuit charges and stores electric quantity, the LED diode light-emitting circuit is in a state to be driven, the charging reserve circuit outputs stable direct current to the constant current driving chip for continuous power supply through the compensation circuit, and outputs direct current of 5V to the touch dimming chip for power supply through the voltage stabilizing circuit. According to the invention, the charging reserve circuit is designed in the driving power supply, so that the power supply stability of the constant-current driving chip and the touch dimming chip in the touch dimming LED power supply is improved, the circuit structure is simple, the brightness memory function is realized, and the use reliability and stability of the touch dimming LED power supply are improved.
Description
Technical Field
The invention relates to a touch dimming LED power supply with a memory function and a design method thereof, and belongs to the technical field of LED circuits.
Background
The LED is a semiconductor device capable of directly converting electric energy into light energy, and is different from the principle of tungsten filament luminescence of an incandescent lamp and trichromatic powder luminescence of an energy-saving lamp, and adopts electric field luminescence. In modern society, LED lamps using LEDs as light sources are increasingly widely used because of the advantages of small size, long life, high light efficiency, no radiation, low power consumption, and the like. As touch dimming control circuits have been increasingly studied, LED dimmable power supplies have also moved to the market.
CN104869720a relates to an adjustable LED lamp and a dimming method thereof, wherein the adjustable LED lamp comprises a driving device and a lighting lamp connected with the driving device, and the driving device is used for responding to the upper electric power in a preset first preset time period to restore the initial setting. The adjustable LED lamp and the dimming method thereof intercept a time period after the driving device is electrified to work, and reset is realized by utilizing the upper electric power in the time period, so that the dimming memory can be realized and the reset can be realized under the condition that the traditional switch does not need to add any circuit and key, and when a plurality of lamps are asynchronous, the lamps can be in a synchronous state through the reset.
CN104582206a discloses a switching operation identifying circuit, the basic idea is that a resistor is connected in parallel to two ends of the power switch, and when the switch is turned off, a weak current (about tens of microamps) required for "memorizing" can be provided for the LED lamp controller through the resistor. Having the energy required for "memorization" the problem at the logic operation level is then considered. The invention realizes the LED switch dimming and toning technology with the memory function at the lowest cost, does not need a remote controller, does not need a battery polluting the environment, and does not need complex technical means. The invention provides more humanized operation and longer life of the switch and the LED lamp.
The circuit structure of the actual memory function in the existing dimming circuit with the memory function is complex, and the voltage stability is still to be high.
Disclosure of Invention
According to the touch dimming LED power supply with the memory function and the design method thereof, the charging reserve circuit is designed in the driving power supply, so that the power supply stability of the constant current driving chip and the touch dimming chip in the touch dimming LED power supply is improved, the circuit structure is simple, the brightness memory function is realized, and the use reliability and stability of the touch dimming LED power supply are improved.
The technical scheme adopted by the invention for achieving the purpose is as follows:
the touch dimming LED power supply with the memory function is characterized by comprising a rectification starting circuit connected with a mains supply, a constant current driving chip connected with the output end of the rectification starting circuit, a charge reserve circuit connected with the constant current driving chip and the rectification starting circuit respectively, a compensation circuit connected with the charge reserve circuit, a voltage stabilizing circuit connected with the charge reserve circuit, a touch dimming chip connected with the voltage stabilizing circuit and an LED diode light-emitting circuit connected with the touch dimming chip, wherein the LED diode light-emitting circuit is connected with the charge reserve circuit, and the touch dimming chip is connected with the constant current driving chip and an induction touch electrode; the rectification starting circuit rectifies 220V alternating current into direct current to supply power to the constant current driving chip, so that the constant current driving chip starts to work, the constant current driving chip supplies power to the charging reserve circuit, the charging reserve circuit charges and stores electric quantity, the LED diode light-emitting circuit is in a state to be driven, the charging reserve circuit outputs stable direct current to continuously supply power to the constant current driving chip through the compensation circuit, and the voltage stabilizing circuit outputs direct current of 5V to supply power to the touch control dimming chip.
Preferably, the rectifying starting circuit comprises a fuse tube F1, diode rectifying bridges E1-E4, a filter capacitor C3, safe discharge resistors R1 and R2 and starting resistors R4 and R3, wherein the diode rectifying bridges E1-E4 are connected with a mains supply through the fuse tube F1, the diode rectifying bridges E1-E4 are connected with the filter capacitor C3 in parallel, the filter capacitor C3 is connected with the safe discharge resistor R1 in parallel, the filter capacitor R2 is grounded after being connected with the ground, the input ends of the starting resistors R3 and R4 are connected with the filter capacitor C3, and the output ends of the filter capacitor C3 are connected with a constant current driving chip to supply power to a pin 2 of the constant current driving chip.
Preferably, the charge reserve circuit comprises a switching power tube N1 connected with a pin 5 of the constant current driving chip and a switching transformer, wherein a pin 1 of the switching power tube N1 is connected with the pin 5 of the constant current driving chip, and the switching transformer comprises a primary coil NF connected with a starting rectifying circuit and a pin 2 of the switching power tube N1 respectively, a secondary coil NS connected with an LED diode light-emitting circuit, a secondary coil NF connected with a compensating circuit and a secondary coil NF2 connected with a voltage stabilizing circuit.
Preferably, the primary coil NF is connected to the rectification starting circuit through a spike voltage absorbing circuit, the spike voltage absorbing circuit includes a diode E5, a capacitor C1 and a resistor R5, one end of the primary coil NF is connected to the capacitor C1, the other end is connected to the diode E5 and the 2 pin of the switching power tube N1, the diode E5 is connected to the capacitor C1, and the capacitor C1 is connected to the rectification starting circuit after being connected to the resistor R5 in parallel.
Preferably, the secondary coil NF is connected with the compensation circuit through a voltage division adjusting circuit, the voltage division adjusting circuit comprises voltage division resistors R9 and R10, a series resistor R6 and a diode E6 which are connected in series, the voltage division resistors R9 and R10 are connected in series at two ends of the secondary coil NF and are connected to a pin 3 of the constant current driving chip, one end of the secondary coil NF is connected in series with the series resistor R6 and the diode E6 to one end of the compensation circuit, and the other end of the secondary coil NF is directly connected to the other end of the compensation circuit.
Preferably, the compensation circuit comprises a decoupling capacitor C4, two ends of the decoupling capacitor C4 are respectively connected with a pin 2 and a pin 6 of the constant source driving chip to form the compensation circuit, and the diode E6 and the secondary coil NF are respectively connected to two ends of the decoupling capacitor C4.
Preferably, the constant current driving chip and the switching power tube N1 are grounded through a current detection circuit, the current detection circuit comprises a resistor R14 and a grounding resistor R7, one end of the grounding resistor R7 is connected with a pin 4 of the constant current driving chip through the resistor R14 and is connected with a pin 3 of the switching power tube N1, and the other end of the grounding resistor R7 is grounded.
Preferably, the voltage stabilizing circuit comprises a resistor R12, a diode E7, a decoupling capacitor C5 and a voltage stabilizing module W1, one end of a secondary coil NF2 is connected with the resistor R12 and the diode E7 in series, the positive stage of the decoupling capacitor C5 and the 1 pin of the voltage stabilizing module W1, the negative stage of the decoupling capacitor C5 and the 2 pin of the voltage stabilizing module are connected with the ground through a sampling circuit, the voltage stabilizing module is connected with a touch dimming chip through the sampling circuit, the sampling circuit comprises a filter capacitor C9, a sampling capacitor C8 and a frequency modulation resistor R13, the 3 pin of the voltage stabilizing module is connected with the pin 6 of the touch dimming chip and is connected with the pin 1 of the touch dimming chip through the frequency modulation resistor R13, one end of the filter capacitor C9 is connected with one end of the voltage stabilizing module and the pin 3 of the touch dimming chip, the other end of the filter capacitor C8 is connected with one end of the sampling capacitor C8 and the pin 4 of the touch dimming chip and the other end of the sampling capacitor C8 is grounded, and the other end of the sampling capacitor C8 is connected with the pin 2 of the touch dimming chip.
Preferably, the LED diode light emitting circuit includes a diode E8, a filter capacitor C2, a filter capacitor C6, and an LED diode string lamp, one end of the secondary coil NS is sequentially connected in series with the diode E8, one end of the resistor R8, the positive stage of the filter capacitor C2, the positive stage of the filter capacitor C6, and one end of the LED diode string lamp, and the other end of the secondary coil NS is sequentially connected in series with the other end of the resistor R8, the negative electrode of the filter capacitor C2, the negative stage of the filter capacitor C6, and the other end of the LED diode string lamp.
The design method of the touch dimming LED power supply with the memory function is characterized in that a charging reserve circuit is designed in the touch dimming LED power supply with the memory function, continuous and stable direct-current voltage is respectively provided for a constant-current driving chip and a touch dimming chip through connection of the charging reserve circuit and a compensation circuit and a voltage stabilizing circuit, the LED light emitting circuit is in a state to be driven through connection of the charging reserve circuit and an LED light emitting circuit, a corresponding control signal is sent to the constant-current driving chip through connection of the touch dimming chip and the constant-current driving chip, the constant-current driving chip is controlled to be adjusted to a corresponding working conduction state, a corresponding driving induction voltage is generated in the charging reserve circuit, the LED secondary light emitting circuit is driven to emit light through the corresponding driving induction voltage, and under the condition of no power failure, the constant-current driving chip stores the last working conduction state, and accordingly, the consistency of the front working conduction state and the back working conduction state is achieved, and accordingly the brightness memory function of the touch dimming LED power supply with the memory function is achieved.
According to the touch dimming LED power supply, the rectification starting circuit is connected with mains supply, the mains supply is converted into direct-current voltage and then supplies power to the constant-current driving chip, the constant-current driving chip is started, so that power is supplied to the charge reserve circuit, the charge reserve circuit is charged for storing electric quantity, continuous and stable straight-flat voltage is provided for the constant-current driving chip through connection of the charge reserve circuit and the voltage stabilizing circuit, stable straight-flat voltage is provided for the touch dimming chip through connection of the charge reserve circuit and the voltage stabilizing circuit, the LED diode light emitting circuit is in a state to be driven through connection of the charge reserve circuit and the LED diode light emitting circuit, the touch dimming chip is connected with the constant-current driving chip, the constant-current driving chip is controlled to emit corresponding control signals to the constant-current driving chip when the touch sensing touch electrode inputs human body sensing touch signals to the touch dimming chip, the constant-current driving chip is controlled to be adjusted to be in a corresponding work conducting state, corresponding driving induction voltage is generated in the charge reserve circuit, the LED secondary light emitting circuit is driven through corresponding driving induction voltage, the LED secondary light emitting circuit is in a state under the condition of no power failure, the LED is in a state of being conducted after the touch dimming chip is conducted, and the LED is in a state with consistent brightness after the touch dimming is conducted, and the LED power supply is in a state when the state is in a state with a state is in a state when the touch state is in a state.
According to the invention, the charging reserve circuit is designed in the driving power supply, so that the power supply stability of the constant current driving chip and the touch dimming chip in the touch dimming LED power supply is improved, the induction driving light emitting of the LED light emitting circuit is realized, the circuit structure is simple, the constant current driving chip stores the last working conduction state under the condition of no power failure, the front working conduction state and the back working conduction state are consistent, the same driving induction voltage for driving the LED light emitting circuit to emit light is generated in the charging reserve circuit, and the brightness memory function of the touch dimming LED power supply with the memory function is realized.
According to the invention, the design of the compensation circuit and the voltage stabilizing circuit converts the induced voltage stored by the charge reserve circuit into the regulated smoothing voltage, so that the constant current driving chip and the touch dimming chip obtain continuous and stable direct current voltage which meets the requirements of respective working states, the power supply stability of the constant current driving chip and the touch dimming chip is improved, and the use reliability and stability of the touch dimming LED power supply are improved.
Drawings
Fig. 1 is a circuit block diagram of a touch dimming LED power supply with a memory function in an embodiment.
Fig. 2 is a schematic circuit diagram of a touch dimming LED power supply with a memory function in an embodiment.
Detailed Description
Embodiments of the present invention are described in detail below with reference to fig. 1-2.
The touch dimming LED power supply with the memory function is characterized by comprising a rectification starting circuit connected with a mains supply, a constant current driving chip connected with the output end of the rectification starting circuit, a charge reserve circuit connected with the constant current driving chip and the rectification starting circuit respectively, a compensation circuit connected with the charge reserve circuit, a voltage stabilizing circuit connected with the charge reserve circuit, a touch dimming chip connected with the voltage stabilizing circuit and an LED diode light-emitting circuit connected with the touch dimming chip, wherein the LED diode light-emitting circuit is connected with the charge reserve circuit, and the touch dimming chip is connected with the constant current driving chip and an induction touch electrode; the rectification starting circuit rectifies 220V alternating current into direct current to supply power to the constant current driving chip, so that the constant current driving chip starts to work, the constant current driving chip supplies power to the charging reserve circuit, the charging reserve circuit charges and stores electric quantity, the LED diode light-emitting circuit is in a state to be driven, the charging reserve circuit outputs stable direct current to continuously supply power to the constant current driving chip through the compensation circuit, and the voltage stabilizing circuit outputs direct current of 5V to supply power to the touch control dimming chip. The touch sensing touch electrode inputs a human body sensing touch signal to the touch dimming chip, controls the touch dimming chip to send out a corresponding control signal to the constant current driving chip, controls the constant current driving chip to adjust to a corresponding working conduction state, generates a corresponding driving induction voltage in the charge reserve circuit, and drives the LED secondary light-emitting circuit to emit light through the corresponding driving induction voltage.
The touch dimming LED power supply comprises a rectification starting circuit, a constant current driving chip, a voltage stabilizing circuit, a touch dimming circuit, a constant current driving chip, a touch dimming circuit, a control sensing touch electrode, a human body sensing touch signal, a control sensing driving chip, a driving sensing voltage driving circuit, a LED secondary light-emitting circuit, a memory circuit and a memory circuit.
The rectifying starting circuit comprises a fuse tube F1, diode rectifying bridges E1-E4, a filter capacitor C3, safe discharge resistors R1 and R2 and starting resistors R4 and R3, wherein the diode rectifying bridges E1-E4 are connected with a mains supply through the fuse tube F1, the diode rectifying bridges E1-E4 are connected with the filter capacitor C3 in parallel, the filter capacitor C3 is connected with the safe discharge resistor R1 and R2 in parallel and then grounded, the input ends of the starting resistors R3 and R4 are connected with the filter capacitor C3, and the output ends of the starting resistors R3 and R4 are connected with a constant current driving chip to supply power to a pin 2 of the constant current driving chip.
The charging reserve circuit comprises a switching power tube N1 connected with a pin 5 of the constant current driving chip and a switching transformer, wherein a pin 1 of the switching power tube N1 is connected with the pin 5 of the constant current driving chip, and the switching transformer comprises a primary coil NF connected with a starting rectifying circuit and a pin 2 of the switching power tube N1 respectively, a secondary coil NS connected with an LED diode light-emitting circuit, a secondary coil NF connected with a compensating circuit and a secondary coil NF2 connected with a voltage stabilizing circuit. The charging reserve circuit is used for charging and storing electric quantity, the stored electric quantity forms induced voltage in a secondary coil of the charging reserve circuit, the induced voltage is converted into direct current voltage required by the touch dimming chip through the voltage stabilizing circuit to supply power to the touch dimming chip, the induced voltage is converted into direct current voltage required by the constant current driving chip through the compensation circuit to supply power to the constant current driving chip, and the LED diode light-emitting circuit is in a state to be driven.
The primary coil NF is connected with the rectification starting circuit through the peak voltage absorbing circuit, the peak voltage absorbing circuit comprises a diode E5, a capacitor C1 and a resistor R5, one end of the primary coil NF is connected with the capacitor C1, the other end of the primary coil NF is connected with the diode E5 and a 2 pin of the switching power tube N1, the diode E5 is connected with the capacitor C1, and the capacitor C1 is connected with the rectification starting circuit after being connected with the resistor R5 in parallel. The peak voltage is absorbed by the peak voltage absorbing circuit, so that the voltage stability of the charge reserve circuit is improved.
The secondary coil NF is connected with the compensation circuit through a voltage division adjusting circuit, the voltage division adjusting circuit comprises voltage division resistors R9 and R10, a series resistor R6 and a diode E6 which are connected in series, the voltage division resistors R9 and R10 are connected in series at two ends of the secondary coil NF and are connected to a pin 3 of the constant current driving chip, one end of the secondary coil NF is connected in series with the series resistor R6 and the diode E6 to one end of the compensation circuit, and the other end of the secondary coil NF is directly connected to the other end of the compensation circuit.
The compensation circuit comprises a decoupling capacitor C4, wherein two ends of the decoupling capacitor C4 are respectively connected with a pin 2 and a pin 6 of the constant source driving chip to form the compensation circuit, and a diode E6 and a secondary coil NF are respectively connected to two ends of the decoupling capacitor C4. The voltage division adjusting circuit carries out voltage division adjustment on the induction voltage in the secondary coil NF, and then the voltage is stabilized through the compensating circuit, so that stable power supply is continuously carried out on the constant current driving chip.
The constant current driving chip and the switching power tube N1 are grounded through a current detection circuit, the current detection circuit comprises a resistor R14 and a grounding resistor R7, one end of the grounding resistor R7 is connected with a pin 4 of the constant current driving chip through the resistor R14 and is connected with a pin 3 of the switching power tube N1, and the other end of the grounding resistor R7 is grounded. And the constant current driving chip and the switching power tube N1 are grounded and protected through a current detection circuit.
The voltage stabilizing circuit comprises a resistor R12, a diode E7, a decoupling capacitor C5 and a voltage stabilizing module W1, one end of a secondary coil NF2 is connected with the resistor R12 and the diode E7 in series, the positive end of the decoupling capacitor C5 and the 1 pin of the voltage stabilizing module W1, the negative end of the decoupling capacitor C5 and the 2 pin of the voltage stabilizing module are connected with the ground, the voltage stabilizing module is connected with the touch dimming chip through a sampling circuit, the sampling circuit comprises a filter capacitor C9, a sampling capacitor C8 and a frequency modulation resistor R13, the 3 pin of the voltage stabilizing module is connected with the pin 6 of the touch dimming chip and is connected with the pin 1 of the touch dimming chip through the frequency modulation resistor R13, one end of the filter capacitor C9 is connected with one end of the voltage stabilizing module and the pin 3 of the touch dimming chip, the other end of the filter capacitor C8 is connected with one end of the sampling capacitor C8 and the pin 4 of the touch dimming chip and is grounded, and the other end of the sampling capacitor C8 is connected with the pin 2 of the touch dimming chip. And rectifying and stabilizing the induced voltage of the secondary coil NF2 by using a voltage stabilizing module, and outputting direct-current voltage of 5V to the touch dimming chip. And the voltage stabilizing circuit and the touch dimming chip are subjected to grounding protection through the sampling circuit.
Preferably, the LED diode light emitting circuit includes a diode E8, a filter capacitor C2, a filter capacitor C6, and an LED diode string lamp, one end of the secondary coil NS is sequentially connected in series with the diode E8, one end of the resistor R8, the positive stage of the filter capacitor C2, the positive stage of the filter capacitor C6, and one end of the LED diode string lamp, and the other end of the secondary coil NS is sequentially connected in series with the other end of the resistor R8, the negative electrode of the filter capacitor C2, the negative stage of the filter capacitor C6, and the other end of the LED diode string lamp. The induced voltage generated on the secondary coil NS is subjected to filtering rectification by the diode E8 and the filter capacitors C2 and C6, so that the power supply stability of the LED diode string lamp is improved.
The design method of the touch dimming LED power supply with the memory function is characterized in that a charging reserve circuit is designed in the touch dimming LED power supply with the memory function, continuous and stable direct-current voltage is respectively provided for a constant-current driving chip and a touch dimming chip through connection of the charging reserve circuit and a compensation circuit and a voltage stabilizing circuit, the LED light emitting circuit is in a state to be driven through connection of the charging reserve circuit and an LED light emitting circuit, a corresponding control signal is sent to the constant-current driving chip through connection of the touch dimming chip and the constant-current driving chip, the constant-current driving chip is controlled to be adjusted to a corresponding working conduction state, a corresponding driving induction voltage is generated in the charging reserve circuit, the LED secondary light emitting circuit is driven to emit light through the corresponding driving induction voltage, and under the condition of no power failure, the constant-current driving chip stores the last working conduction state, and accordingly, the consistency of the front working conduction state and the back working conduction state is achieved, and accordingly the brightness memory function of the touch dimming LED power supply with the memory function is achieved.
Specific embodiments of the present invention are described in detail below:
the constant current driving chip selects BP3318 chip, its maximum output power is 50W, in the LED diode string lamp, the power of single LED diode is 1W, the LED diode number in the LED diode string lamp is 7-10, the voltage stabilizing module is voltage stabilizing module 78L05. The touch dimming chip is an SGL8022W chip, a pin 7 of the touch dimming chip is a work indication output pin, a pin 2 is a sampling capacitor input pin, a pin 3 is a chip power supply positive end, a pin 4 is a chip grounding end, a pin 5 is a touch regulation pin, a pin 6 is a power supply negative end, and a pin 7 is a PWM control output pin. When the circuit works, 220V alternating current of the commercial power passes through the fuse tube F1 and is rectified by a bridge pile formed by E1-E4, and stable direct current voltage is formed on the filter capacitor C3. The positive voltage of the filter capacitor C3 is supplied to the working voltage of the pin 2 of the constant current driving chip through the starting resistors R3 and R4, the constant current driving chip starts working, and the pin 5 outputs the switching pulse voltage to enable the pins 2 and 3 of the switching power tube N1 to be conducted, so that the primary coil NP of the switching transformer is reserved. The induced voltage generated in the secondary coil NF of the switching transformer is filtered by the rectifying decoupling capacitor C4 of the diode E6, and stable direct-current voltage VCC is output for the constant-current driving chip. The induced voltage generated in the secondary coil NF2 is filtered by a diode E7 rectifying decoupling capacitor C5 to provide voltage for the 1 pin of the voltage stabilizing module 78L05, the 3 pin of the voltage stabilizing module 78L05 outputs stable 5V direct current voltage, the 5V voltage is provided for the 3 pin of the touch dimming chip, when the pin 5 of the touch dimming chip is connected to a human body sensing touch signal sensed by the sensing touch electrode, a corresponding control signal is output at the pin 7 of the touch dimming chip, the constant current driving chip is controlled by a resistor R11 to enable the constant current driving chip to be adjusted to a corresponding working conduction state, the 1 pin and the 2 pin of the switching power tube N1 are conducted, the induced voltage generated in the secondary coil NB is filtered by the E8 rectifying capacitor C6 to output stable direct current voltage to drive the LED to emit light.
The dimming operation of the touch dimming LED power supply with the memory function specifically comprises the following steps:
1. when the lamp is initially powered on, the lamp is in an off state. When the touch electrode is sensed by clicking touch (the touch duration is less than 550 ms), the lighting control of the lamp light can be realized. The touch lamp is turned on by clicking once; the touch lamp is clicked again to be turned off, and when the lamp is turned on or off, no brightness buffer exists. And the initial brightness of the lamp lighting is fixed to 50% of the full brightness.
2. When the touch electrode is sensed by long-press touch (the touch duration is longer than 550 ms), stepless brightness adjustment of lamplight can be realized. Under the condition of continuous power-off, the brightness of each click touch when the lamp is turned off can be memorized, and the brightness is taken as the initial brightness when the lamp is turned on in the next click touch, so that the brightness memorizing function is realized. Under the condition of power off, the first click touch after the power on is turned on again, and the initial brightness is fixed to be 50% of the full brightness.
3. The click touch sensing touch electrode and the long-press touch sensing touch electrode can be used at will at any time, and the functions of the click touch sensing touch electrode and the long-press touch sensing touch electrode are not interfered and limited.
The foregoing disclosure of embodiments of the present invention has been fully described with reference to the accompanying drawings, in which it is to be understood that the embodiments described are merely some of the embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (2)
1. The touch dimming LED power supply with the memory function is characterized by comprising a rectification starting circuit connected with a mains supply, a constant current driving chip connected with the output end of the rectification starting circuit, a charge reserve circuit connected with the constant current driving chip and the rectification starting circuit respectively, a compensation circuit connected with the charge reserve circuit, a voltage stabilizing circuit connected with the charge reserve circuit, a touch dimming chip connected with the voltage stabilizing circuit and an LED diode light-emitting circuit connected with the touch dimming chip, wherein the LED diode light-emitting circuit is connected with the charge reserve circuit, and the touch dimming chip is connected with the constant current driving chip and an induction touch electrode; the rectification starting circuit rectifies 220V alternating current into direct current to supply power to the constant current driving chip, so that the constant current driving chip starts to work, the constant current driving chip supplies power to the charging reserve circuit, the charging reserve circuit charges and stores electric quantity, the LED diode light-emitting circuit is in a state to be driven, the charging reserve circuit outputs stable direct current to continuously supply power to the constant current driving chip through the compensation circuit, and the voltage stabilizing circuit outputs direct current of 5V to supply power to the touch control dimming chip;
the rectifying starting circuit comprises a fuse tube F1, diode rectifier bridges E1-E4, a filter capacitor C3, safe discharge resistors R1 and R2 and starting resistors R4 and R3, wherein the diode rectifier bridges E1-E4 are connected with a mains supply through the fuse tube F1, the diode rectifier bridges E1-E4 are connected with the filter capacitor C3 in parallel, the filter capacitor C3 is connected with the safe discharge resistors R1 and R2 in parallel and then grounded, the input ends of the starting resistors R3 and R4 are connected with the filter capacitor C3, and the output ends of the starting resistors R3 and R4 are connected with a constant current driving chip to supply power to a pin 2 of the constant current driving chip;
the charging reserve circuit comprises a switching power tube N1 connected with a pin 5 of the constant current driving chip and a switching transformer, wherein a pin 1 of the switching power tube N1 is connected with the pin 5 of the constant current driving chip, and the switching transformer comprises a primary coil NF connected with a starting rectifying circuit and a pin 2 of the switching power tube N1 respectively, a secondary coil NS connected with an LED diode light-emitting circuit, a secondary coil NF connected with a compensation circuit and a secondary coil NF2 connected with a voltage stabilizing circuit;
the primary coil NF is connected with the rectification starting circuit through a peak voltage absorbing circuit, the peak voltage absorbing circuit comprises a diode E5, a capacitor C1 and a resistor R5, one end of the primary coil NF is connected with the capacitor C1, the other end of the primary coil NF is connected with the diode E5 and a pin 2 of the switching power tube N1, the diode E5 is connected with the capacitor C1, and the capacitor C1 is connected with the rectification starting circuit after being connected with the resistor R5 in parallel;
the secondary coil NF is connected with the compensation circuit through a voltage division adjusting circuit, the voltage division adjusting circuit comprises voltage division resistors R9 and R10 which are connected in series, a series resistor R6 and a diode E6, the voltage division resistors R9 and R10 are connected in series at two ends of the secondary coil NF and are connected to a pin 3 of the constant current driving chip, one end of the secondary coil NF is connected in series with the series resistor R6 and the diode E6 to one end of the compensation circuit, and the other end of the secondary coil NF is directly connected to the other end of the compensation circuit;
the compensation circuit comprises a decoupling capacitor C4, wherein two ends of the decoupling capacitor C4 are respectively connected with a pin 2 and a pin 6 of the constant source driving chip to form the compensation circuit, and a diode E6 and a secondary coil NF are respectively connected to two ends of the decoupling capacitor C4;
the constant current driving chip and the switching power tube N1 are grounded through a current detection circuit, the current detection circuit comprises a resistor R14 and a grounding resistor R7, one end of the grounding resistor R7 is connected with a pin 4 of the constant current driving chip through the resistor R14 and is connected with a pin 3 of the switching power tube N1, and the other end of the grounding resistor R7 is grounded;
the voltage stabilizing circuit comprises a resistor R12, a diode E7, a decoupling capacitor C5 and a voltage stabilizing module W1, wherein one end of a secondary coil NF2 is connected with the resistor R12 and the diode E7 in series, the positive stage of the decoupling capacitor C5 and the 1 pin of the voltage stabilizing module W1, the negative stage of the decoupling capacitor C5 and the 2 pin of the voltage stabilizing module are connected in series and grounded, the voltage stabilizing module is connected with a touch dimming chip through a sampling circuit, the sampling circuit comprises a filter capacitor C9, a sampling capacitor C8 and a frequency modulation resistor R13, the 3 pin of the voltage stabilizing module is connected with the pin 6 of the touch dimming chip and is connected with the pin 1 of the touch dimming chip through the frequency modulation resistor R13, one end of the filter capacitor C9 is connected with one end of the voltage stabilizing module and the pin 3 of the touch dimming chip, the other end of the filter capacitor C8 is connected with one end of the pin 4 of the touch dimming chip and grounded, and the other end of the sampling capacitor C8 is connected with the pin 2 of the touch dimming chip;
the LED diode light-emitting circuit comprises a diode E8, filter capacitors C2 and C6 and an LED diode string lamp, one end of a secondary coil NS is sequentially connected with the diode E8, one end of a resistor R8, the positive stage of the filter capacitor C2, the positive stage of the filter capacitor C6 and one end of the LED diode string lamp in series, and the other end of the secondary coil NS is sequentially connected with the other end of the resistor R8, the negative electrode of the filter capacitor C2, the negative stage of the filter capacitor C6 and the other end of the LED diode string lamp in series.
2. The method for designing the touch dimming LED power supply with the memory function according to claim 1, wherein a charge reserve circuit is designed in the touch dimming LED power supply with the memory function, continuous and stable direct-current voltage is respectively provided for a constant-current driving chip and a touch dimming chip through connection of the charge reserve circuit and a compensation circuit and a voltage stabilizing circuit, the LED light emitting circuit is in a state to be driven through connection of the charge reserve circuit and an LED light emitting circuit, a corresponding control signal is sent to the constant-current driving chip through connection of the touch dimming chip and the constant-current driving chip, the constant-current driving chip is controlled to be adjusted to a corresponding working conduction state, a corresponding driving induction voltage is generated in the charge reserve circuit, the LED secondary light emitting circuit is driven to emit light through the corresponding driving induction voltage, and under the condition of no power failure, consistency of the previous working conduction state and the last working conduction state is realized through storage of the constant-current driving chip, so that the brightness memory function of the touch dimming LED power supply with the memory function is realized.
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| CN108430140A (en) * | 2018-05-31 | 2018-08-21 | 东莞艾笛森光电限公司 | PWM L ED drive circuit with power-off memory function |
| CN108738203B (en) * | 2018-07-13 | 2025-02-07 | 深圳安赋特科技有限公司 | LED power supply constant power input control circuit |
| CN111225474B (en) * | 2020-01-13 | 2024-12-24 | 深圳市明微电子股份有限公司 | Light source driving circuit, lighting system and light source driving method for improving power factor |
| CN112747267A (en) * | 2021-01-29 | 2021-05-04 | 吉安茹姿科技有限公司 | LED lamp strip capable of adjusting brightness |
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Denomination of invention: A touch control dimmable LED power supply with memory function and its design method Granted publication date: 20230929 Pledgee: Zhuzhou Rural Commercial Bank Co.,Ltd. Pledgor: GOLDP ELECTRIC APPLIANCE Co.,Ltd. Registration number: Y2026980000923 |