CN209914105U

CN209914105U - Drive power supply capable of adjusting light and color temperature

Info

Publication number: CN209914105U
Application number: CN201821496310.7U
Authority: CN
Inventors: 易润华
Original assignee: Shenzhen City Weishengtai Photoelectric Co Ltd
Current assignee: Shenzhen City Weishengtai Photoelectric Co Ltd
Priority date: 2018-09-13
Filing date: 2018-09-13
Publication date: 2020-01-07
Anticipated expiration: 2028-09-13

Abstract

The utility model discloses a mixing of colors temperature drive power supply adjusts luminance, including EMI circuit, rectifier circuit, filter circuit, boost inductor, PFC corrector, high-pressure rectification filter circuit, PFC switch tube, PWM controller, current detection circuit, rectification filter circuit, power conversion circuit, synchronous rectification driver, overflow detection circuit, current sampling, voltage sampling, comparison and amplification, 3.3V production circuit, signal processing and PWM output chip, power drive circuit. This the utility model discloses a 2.4G wireless intelligent light-adjusting mixing of colors temperature drive power supply adopts 2.4G wireless reception's mode, with opening and closing and the regulation of luminance colour temperature of control signal with wireless communication's form control lamps and lanterns. By adopting the 2.4G wireless receiving technology, the wire distribution device not only has the characteristics of strong penetration capability and long receiving distance, but also has more important and more obvious characteristics and reduces a large amount of wiring work.

Description

Drive power supply capable of adjusting light and color temperature

Technical Field

The utility model relates to a lamps and lanterns drive power supply, concretely relates to 2.4G wireless intelligent light-adjusting mixing of colors temperature drive power supply.

Background

At present, people pursue and update different concepts of home life, home illumination is not performed by a lamp, but the lamp is a centralized reflection of illumination, and in order to adapt to the change of brightness, gray scale, color temperature, color and the like of the whole illumination in different spaces and time, the light environment is simulated to guide, the emotion is improved, and the requirement of more humanized illumination environment is reflected. For example: in cold winter, the lamp can be adjusted to warm white color temperature, so that a room feels warmer; in hot summer, the lamp can be adjusted to the cold and white color temperature, so that the room feels cooler.

In the past, especially, the lamps with manual, automatic or intelligent control, no matter the lamps are installed in an open mode or a concealed mode, a large amount of grooving wiring is needed during installation, so that the cost of manpower and material resources is increased, the labor intensity of installation personnel is increased, and the difficulty in overhauling and replacing is higher after the electric wires are damaged.

In the prior lamp, three input lines are generally adopted for realizing double color temperature, the adopted control mode is a common anode, and the pulse width of a cathode is respectively controlled to realize the adjustment of the double color temperature. If two input lines are adopted, the function of adjusting the color temperature can be realized, so that the cost of raw materials of the electric wire is reduced, and the longer the input line of the lamp is, the more the cost of the raw materials of the electric wire can be obviously reduced.

In the past, the lamp is generally a power supply, the dimming and color temperature adjusting controller and the lamp are independently separated, and the middle of the lamp is connected by a lead, so that the installation difficulty and the labor cost are increased.

In the prior color temperature adjusting lamp, three wires need to distinguish a positive wire, a negative wire with cold white color temperature is connected, a negative wire with warm white color temperature is connected, and the lamp cannot normally work when the wires are connected in a wrong way or in a reverse way.

In the prior art, one interface or three wires are mostly reserved in the lamp with the adjustable color temperature, and the flexibility of connecting the lamp into the lamp is poor.

In the prior art, three wires are generally adopted to realize a two-color temperature adjusting mode; in the prior art, a power supply, a dimming and color temperature adjusting controller and a lamp are separated independently.

In the prior art, three wires are needed, so that the wiring cost and the raw material cost are increased, and the longer the lamp input wire is, the more the cost of the raw material of the wire can be obviously increased; the more the leads are, the more difficulty in inspection and maintenance is increased when the fault occurs; the power supply, the dimming and color temperature adjusting controller and the lamp are independently separated, and the middle of the power supply, the dimming and color temperature adjusting controller and the lamp are connected through a wire, so that the installation difficulty and the labor cost are increased.

The three wires need to distinguish a positive wire, are connected with a negative wire with cold white color temperature and a negative wire with warm white color temperature, and cannot work normally when the wires are connected in a wrong way or in a reverse way. And one interface or three wires are reserved, so that the flexibility of accessing the lamp is poor.

Disclosure of Invention

The utility model provides a to above-mentioned problem, provide a adjust luminance mixing of colors temperature drive power supply, including EMI circuit, rectifier circuit, filter circuit, boost inductor, PFC corrector, high-pressure rectification filter circuit, PFC switch tube, PWM controller, current detection circuit, rectification filter circuit, power conversion circuit, synchronous rectification driver, overcurrent detection circuit, current sampling, voltage sampling, comparative amplification, 3.3V produce circuit, signal processing and PWM output chip, power drive circuit;

the mains supply voltage is connected to the EMI circuit and then connected with the rectifying circuit, the rectifying circuit is connected with the filter circuit, the filter circuit is connected with the boost inductor, and the boost inductor is connected with the high-voltage rectifying and filtering circuit;

the PFC corrector is connected with the input end of the boost inductor and is also connected with a grid electrode of a PFC switching tube, the drain end of the PFC switching tube is connected with the high-voltage rectifying circuit, and a PFC source electrode is connected with a primary ground;

the output of the high-voltage rectification filter circuit is connected with one end of the primary side of the step-down transformer, the other end of the primary side of the step-down transformer is connected with the drain electrode of the power switch, and the source electrode of the high-voltage rectification filter circuit is connected with the current detection circuit; the current signal detected by the current detection circuit is converted into a voltage signal and is connected with a PWM controller, and the output of the PWM controller is connected with the grid electrode of the power switch tube;

one end of the auxiliary winding of the step-down transformer is connected with a primary ground, and the other end of the auxiliary winding of the step-down transformer is connected with a rectification filter circuit and a PWM controller through the rectification filter circuit to provide working voltage for the PWM controller; meanwhile, the PWM controller is connected with the PFC corrector and provides the PFC corrector with the required working voltage;

one end of the secondary side of the step-down transformer is connected with a secondary ground, one end of the secondary side of the step-down transformer is connected with a rectifying and filtering circuit, the other end of the secondary side of the step-down transformer is connected with a synchronous rectifying driver, the synchronous rectifying driver is connected with the rectifying and filtering circuit to control the rectifying and filtering circuit to work, and the rear side of the synchronous rectifying driver is;

the direct-current voltage is connected with the photoelectric coupler to provide working voltage for the photoelectric coupler;

the direct-current voltage is connected to the voltage sampling circuit, and compared with a reference voltage connected with the voltage sampling circuit, a generated error signal enters a post-stage comparison amplifying circuit, the comparison amplifying circuit drives a light-emitting device in the photoelectric coupler to be switched on and off, the working state of a receiving triode in the photoelectric coupler is adjusted, the output of a PWM (pulse-width modulation) controller connected with a collector electrode is controlled, the output of the PWM controller controls the level of a grid electrode of a power tube connected with the PWM controller, and the power tube is switched on and off to realize power conversion;

the direct current voltage is connected to the power driving circuit and provides working voltage for the power driver;

the direct-current voltage is connected with the 3.3V voltage generating circuit, the 3.3V voltage generating circuit is connected with the 2.4G wireless receiving chip and the signal processing and PWM output chip, and 3.3V voltage required by the working process is provided for the signal processing and PWM output chip;

the antenna receives a control signal transmitted from the remote control transmitter, the control signal enters the 2.4G wireless receiving chip, the chip is connected with the signal processing and PWM output chip, the power driving circuit connected behind the chip is driven to work through the processing and signal processing and PWM output chip, and the power driving circuit drives the two-color temperature lamp connected behind the power driving circuit, so that the functions of switching, light adjusting and color temperature adjusting of the two-color temperature lamp are realized;

one end of the overcurrent detection circuit is connected with the secondary ground end, when the power driving circuit exceeds a set load, a rising voltage appears in the current detection circuit, the voltage is obtained by the current sampling circuit connected behind the current detection circuit and is mixed with a reference voltage connected with the current sampling circuit to enter the comparison amplification circuit, and a driving signal generated by the comparison amplification circuit controls the on-off of a photoelectric coupler connected at the later stage, so that the stop of the PWM controller connected with the collector of the photoelectric coupler is controlled, and the power converter stops working.

Further, the step-down transformer is an electromagnetic conversion device.

Furthermore, the primary winding and the secondary winding of the step-down transformer change high voltage into required safe direct current voltage through a turn ratio relation.

Furthermore, the power conversion circuit comprises a power switch, a rectifying filter and a step-down transformer.

The utility model has the advantages that:

the utility model adopts the 2.4G wireless receiving technology, which not only has strong penetrating power and long receiving distance, but also has more important and more obvious characteristics to reduce a large amount of wiring work, thereby reducing the cost of manpower and material resources and bringing great convenience to the installation and use of human beings;

the utility model discloses utilize the double-line can realize the luminance and the double-colored temperature regulation of lamps and lanterns to reduce the electric wire raw and other materials cost, the distance more can show the reduction that embodies the electric wire raw and other materials cost far away.

The utility model inputs alternating current with direct access voltage of 100-240V and frequency of 47-63Hz, and is suitable for all parts of the world; the output may be directly connected to the lighting fixture.

The utility model adopts a plurality of output ports, and the diversity and flexibility of the lamp are improved greatly; the two leads do not need to distinguish the positive electrode and the negative electrode, so that the polarity of the leads is not needed to be worried about, and the labor cost is saved.

The utility model discloses a more advanced technological means at present realizes high power factor and high efficiency to reach the active power that reduces electric wire netting pollution and commercial power.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

Fig. 1 is a schematic block diagram of a driving power supply for adjusting light and color temperature according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an electromagnetic interference resistance (EMI), Active Power Factor Correction (APFC), dc high voltage to dc low voltage (power conversion) circuit according to an embodiment of the present invention;

fig. 3 is a schematic diagram of the synchronous rectification filter, voltage regulator, and overcurrent protection circuit according to the embodiment of the present invention;

fig. 4 is a schematic diagram of a wireless receiving, data storing, power driving circuit according to an embodiment of the present invention;

FIG. 5 is a circuit diagram for implementing a two color temperature adjustment using three wires;

fig. 6 is a schematic block diagram of the dimming and color temperature adjustment controller and the lamp independent separation.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 5, as shown in fig. 5, the prior art uses three wires to implement a two-color temperature adjustment method, and L1L2L3 is three wires connected to the LED light string. If the PWM1 outputs high level, the PWM2 outputs low level, M1 is conducted, the W1-Wn warm white lamp string passes through VCC positive voltage, a current loop is formed by an L2 wire M1 to the ground, and the warm white lamp string is lighted; if the PWM2 outputs high level, the PWM1 outputs low level, M2 is conducted, the C1-Cn cold white lamp string passes through VCC positive voltage, an L3 wire M2 forms a current loop to ground, and the cold white lamp string is lighted; if the PWM1 outputs high level, the PWM2 outputs high level, M1M2 is conducted, the W1-Wn warm white lamp string passes through VCC positive voltage, M1 forms a current loop to the ground, and the warm white lamp string is lighted; simultaneously: the C1-Cn cold white light string passes through VCC positive voltage, a current loop is formed from L3 lead M2 to the ground, and the cold white light string is lighted; the color temperatures of the two groups of lamp strings can be changed by respectively changing the duty ratio of the PWM1PWM2, and the brightness of the color temperatures can be adjusted by increasing or decreasing the pulse width of the PWM1PWM 2.

Referring to fig. 6, as shown in fig. 6, the dimming and color temperature adjustment controller and the lamp in the prior art are separated independently, and the voltage of the commercial power of 100V and 240V is introduced into the power adapter from the line L, N, and is transformed, rectified and filtered by the adapter to become a smooth and stable VCC voltage, which is used as a dc power supply for the operation of the dimming and color temperature adjustment controller and the lamp.

The direct current power supply (battery or stabilized voltage supply) can also be used as the direct current power supply for the light and color temperature adjusting controller and the lamp to work.

In the figure, L1L2L3 is three wires connected with the LED lamp string. If the PWM1 outputs high level, the PWM2 outputs low level, M1 is conducted, the W1-Wn warm white lamp string passes through VCC positive voltage, a current loop is formed by an L2 wire M1 to the ground, and the warm white lamp string is lighted; if the PWM2 outputs high level, the PWM1 outputs low level, M2 is conducted, the C1-Cn cold white lamp string passes through VCC positive voltage, an L3 wire M2 forms a current loop to ground, and the cold white lamp string is lighted; if the PWM1 outputs high level, the PWM2 outputs high level, M1M2 is conducted, the W1-Wn warm white lamp string passes through VCC positive voltage, M1 forms a current loop to the ground, and the warm white lamp string is lighted; simultaneously: the C1-Cn cold white light string passes through VCC positive voltage, a current loop is formed from L3 lead M2 to the ground, and the cold white light string is lighted; the color temperatures of the two groups of lamp strings can be changed by respectively changing the duty ratio of the PWM1PWM2, and the brightness of the color temperatures can be adjusted by increasing or decreasing the pulse width of the PWM1PWM 2.

Referring to fig. 1 to 4, as shown in fig. 1 to 4, the utility model discloses a drive power supply adjusts luminance and mixes colours temperature, including EMI circuit, rectifier circuit, filter circuit, boost inductor, PFC corrector, high-pressure rectification filter circuit, PFC switch tube, PWM controller, current detection circuitry, rectification filter circuit, power conversion circuit, synchronous rectification driver, overflow detection circuitry, current sampling, voltage sampling, comparative amplification, 3.3V production circuit, signal processing and PWM output chip, power drive circuit.

The universal mains voltage (100-240V AC 50/60Hz) is connected to an EMI circuit, filters interference, is connected to a rectifying circuit, converts alternating current into pulsating direct current, is connected to a filter circuit, converts the pulsating direct current into smooth direct current, is connected to a boosting inductor, and is connected to a high-voltage rectifying filter circuit after the boosting inductor boosts the direct current to 400V.

The PFC corrector is connected with the input end of the boost inductor to acquire a necessary comparison signal and is also connected with a grid electrode of a PFC switching tube, the PFC corrector controls the on and off of the grid electrode of the switching tube, a drain electrode end of the PFC switching tube is connected with the high-voltage rectification circuit, a PFC source electrode is connected to a primary ground, a drain-source electrode current forms a loop, and the on and off time of the PFC corrector determines the stability of output voltage after high-voltage rectification and filtering.

The output of the high-voltage rectification filter circuit is connected with one end of the primary side of the step-down transformer, the other end of the primary side of the step-down transformer is connected with the drain electrode of the power switch, and the source electrode of the high-voltage rectification filter circuit is connected with the current detection circuit; the current signal detected by the current detection circuit is converted into a voltage signal and is connected and fed back to the PWM controller to adjust the output of the PWM controller, and the output is connected to the grid electrode of the power switch tube.

One end of the auxiliary winding of the step-down transformer is connected with a primary ground, the other end of the auxiliary winding of the step-down transformer is connected with a rectification filter circuit, the rectification filter circuit is connected to a PWM controller, the PWM controller provides working voltage for the PWM controller, and meanwhile, the PWM controller is connected with a PFC corrector and provides required working voltage for the PFC corrector.

The step-down transformer is an electromagnetic conversion device.

The primary winding and the secondary winding of the step-down transformer change high voltage into safe direct current voltage required by people through the turn ratio relationship.

One end of the secondary side of the step-down transformer is connected with the secondary ground, the other end of the secondary side of the step-down transformer is connected with the rectifying and filtering circuit, the synchronous rectifying driver is also connected with the synchronous rectifying driver, the synchronous rectifying driver is connected with the rectifying and filtering circuit to control the rectifying and filtering circuit to work, and the synchronous rectifying driver is connected with the direct-current voltage circuit.

The direct voltage is connected with the photoelectric coupler to provide working voltage for the photoelectric coupler.

The direct-current voltage is connected to the voltage sampling circuit, the direct-current voltage is compared with a reference voltage connected with the voltage sampling circuit, a generated error signal enters the post-stage comparison amplifying circuit, the comparison amplifying circuit drives a light-emitting device in the photoelectric coupler to be switched on and off, the working state of a receiving triode in the photoelectric coupler is adjusted, the output of a PWM (pulse width modulation) controller connected with a collector electrode is controlled, the output of the PWM controller controls the level of a grid electrode of a power tube connected with the PWM controller, the power tube is switched on and off, and power conversion is achieved.

The direct current voltage is connected to the power driving circuit and provides working voltage for the power driver.

The direct current voltage is connected with the 3.3V voltage generating circuit, the 3.3V voltage generating circuit is connected with the 2.4G wireless receiving chip and the signal processing and PWM output chip, and 3.3V voltage required by work is provided for the signal processing and PWM output chip.

The antenna receives a control signal transmitted from the remote control transmitter, the control signal enters the 2.4G wireless receiving chip, the chip is connected with the signal processing and PWM output chip, the power driving circuit connected behind the chip is driven to work through the processing and signal processing and PWM output chip, and the power driving circuit drives the two-color temperature lamp connected behind the power driving circuit, so that the functions of switching, light adjusting and color temperature adjusting of the two-color temperature lamp are realized.

The power conversion circuit comprises a power switch, a rectifying filter and a step-down transformer.

The utility model discloses a circuit theory of operation as follows:

the commercial power (100-240V AC suitable for global voltage) passes through a fuse F1 (short-circuit protection), a thermistor

TR1 (surge protection), piezoresistor MOV1 (lightning stroke protection), EMI circuit (LF1LF2CX1 and LF4) enter DB1 rectification part after filtering conduction and radiation interference, are filtered through pi type filter circuit composed of C10L1 and C11 after rectification, become pulsating direct current voltage and enter boost PFC circuit and power conversion circuit.

U1 is a single-stage PFC controller integrating PFC corrector and PWM output, PFC corrector U1, inductance L2, rectifier diode D2, filter capacitor C14C17, switching power tube Q1 and peripheral component constitute a boost circuit, provide stable 400V DC voltage for the following power conversion stage. Meanwhile, the effects that PF is greater than 0.95 and the harmonic content is less than 10 are easily achieved through the logic action of the internal program of U1 and the coordination of peripheral components.

The power conversion circuit comprises a quasi-resonant PWM controller U2, a power switch tube Q4, a current detection circuit, a step-down transformer T1 synchronous rectifier U3 and a synchronous rectifier Q5, the filter circuit comprises a C28A C28BC29A C29B and an LF3, and stable direct-current voltage required by a load driving circuit and a voltage-stabilizing overcurrent protection circuit is obtained on a secondary side through electromagnetic conversion.

The output stable direct current voltage passes through the 3.3V low-voltage drop generating circuit, obtains low ripple and more stable 3.3V voltage, provides 2.4G wireless receiving chip, signal processing and PWM output chip normal work required voltage.

Power Factor Correction (PFC) implementation principle: u1 is an APFC control chip in current quasi-continuous mode, i.e. the inductor current is at the critical point of continuous mode and discontinuous mode. The working principle is as follows: firstly, a control chip generates a reference signal (from a half wave of a pin 3-Mult) of primary side inductive current through R2R3 and R5, a switching tube Q1 is conducted when each switching period starts, the primary side current of an L2 inductor linearly increases, then a detection signal (a pin 4-CS) of inductive current is compared with the reference signal through R18, when the detection value of the primary side inductive current is larger than the reference value of the primary side inductive current, the switching tube Q1 is turned off, the primary side current of the L2 inductor starts to linearly decrease from the initial state, when the secondary side inductive current decreases to 0 (a pin 5-ZCD), the switching tube Q1 is conducted, and the operation is repeated.

When Q1 is turned off, the polarity of the primary side of L2 is reversed, and the same-name terminal of the secondary side is at a positive potential, which is also the reference potential of the 5-pin (ZCD). When the energy of the main coil is released, the device works in a current quasi-continuous mode, the current is zero, the potential of the auxiliary coil is also reduced, so that the potential of the 5 pin is reduced, the inner circuit of the ZCD is triggered by a negative edge, and when the potential of the ZCD is reduced to be below 1.8V, the inner oscillator is triggered, the potential of the 7 pin is pulled high, and the Q1 is conducted. Therefore, the average current waveform obtained by the active PFC is a complete sine wave and has the same phase as the AC power waveform. The PF value obtained by power factor correction can reach more than 0.95.

Generating and stabilizing direct-current high voltage 400V: a standard booster circuit is composed of an inductor L2, a rectifier diode and a switching tube Q1, generated voltage is sampled through R11R13R15R17 and sent to U1(1) to be compared with internal reference voltage, a driving signal with controllable pulse width is generated, the conduction and closing time of the switching tube is controlled, and the purpose of stabilizing voltage is achieved.

The overcurrent protection of the PFC boost circuit is realized: r18 monitors the source current of Q1 all the time, and if the current flowing through resistor R18 exceeds the set voltage of pin U1(4), U1(7) turns off the PWM output and Q1 turns off. The PFC booster circuit does not work, and the purpose of protecting a post-stage circuit is achieved.

The power conversion implementation principle is as follows: after the ripple voltage is obtained through the starting resistor R8R9R38 to obtain the starting voltage required by the U1(6), the pin U2(5) outputs a square wave driving signal with variable pulse width to drive the Q4 to work, corresponding alternating voltage is output at the secondary side of the transformer according to the turn ratio relation of the secondary side of the transformer through the electromagnetic conversion of the transformer T1, and the alternating voltage is rectified through the Q5 and filtered through the C28AC28B C29A C29B C34 and the LF3 to form stable direct current voltage output, so that the required stable direct current voltage is provided for a load driving circuit and a voltage-stabilizing over-current protection circuit.

In the flyback converter, the primary auxiliary winding coil functions to provide a control signal for turning on the switch in addition to the regulated power supply of U2. When Q4 is cut off, the polarity of the T1 main winding coil is reversed, the same-name end of the auxiliary winding coil is at a positive potential, the positive potential is rectified by a rectifier diode D3, current is limited by R25, the current is filtered by C13, and then stable direct-current voltage is formed and supplied to a power supply of a U2(6) pin (VCC) through secondary filtering consisting of D4 and C15C20, and the positive potential is also a reference potential of a 5 pin (ZCD). When the energy of the T1 main winding coil is released, the current is zero and the potential of the auxiliary coil is decreased, so the potential of the U2(8) pin is decreased, because the ZCD internal circuit is triggered by the negative edge, when the voltage is decreased to below 2V, the internal oscillator is triggered, the potential of the pin is pulled up by 5, and the Q4 is conducted. This is repeated.

In power conversion, a reliable protection circuit is provided in order to prevent overcurrent and short circuit. When the secondary side has short circuit or overcurrent phenomenon for some reason, the source current of the Q4 is increased, the voltage drop of the R37 detection resistor is increased, and when the voltage exceeds the voltage set on the U2(3) pin, the U2(5) pin prohibits PWM output, so that the power conversion circuit stops working. And removing the overcurrent or short-circuit load, and automatically starting the power conversion circuit.

Synchronous rectification: in the design of low voltage and large current of the switching power supply, if a common diode or a schottky diode is used as a rectifying device, the voltage drop of the diode is large, so that large power loss is generated when large current is rectified, and a large amount of heat loss is generated, thereby affecting the overall efficiency of the power supply. Therefore, the power field effect transistor with small internal resistance and voltage drop can replace a diode to solve the problem of larger loss and improve the efficiency of the whole machine.

The fast turn-off intelligent controller U4, the N-channel field effect transistor Q5 and peripheral devices form a flyback synchronous rectification framework. In the working process of the power conversion circuit, during the turn-off period of the Q4, alternating voltage is generated on a secondary main winding and an auxiliary winding of the T1 and rectified by the D5, the current of the R29 is limited to supply power to a pin U4(6), a pin U4(8) outputs a PWM signal to drive the Q5 to be turned on, the voltage on the secondary main winding is rectified by the source and drain of the D6 and the Q5, and the filtered wave of the C28A C28B C29A C29B C34LF3 supplies power to a load. The function of R41 is to slow the turn-on of Q5, and the function of D13 is to accelerate the turn-off of Q5, so that the reverse spike voltage of Q5 during switching is reduced, and a better EMC effect is obtained. R9C16 provides phase compensation for the U4(3) pin.

The output voltage stabilizing circuit consists of a U5 comparator, an A comparator and peripheral circuits.

The overcurrent protection circuit consists of a U5 comparator, a B comparator and a peripheral circuit.

And (3) a voltage stabilizing process: pin 3 of U5: A is a reference 2.5V voltage, the output voltage is increased or decreased due to some reason, the sampling voltage is obtained through R45 and is divided by R47 to be added to U5: pin 2 of a, U5: foot 2 of a and U5: if the output voltage increases or decreases compared to the reference voltage of pin 3 of a, at U5: the result reflected by the divided voltage value on the pin 2 of A also rises or falls, when the divided voltage value is higher or lower than the pin 3 of U5: A, the U5: A (1) outputs low level or high level, the U3: A is controlled to be switched on or off through D10A, and the voltage of the U3: a and U3: b, through photoelectric coupling, the U2(5) is controlled to output different duty ratios of PWM output pulse width, and the Q4 of the power converter is changed in on or off time, so that the output voltage is reduced or increased.

And (3) realizing overcurrent protection: the voltage drop of the resistor R49 is increased due to the increase of the load, the voltage of the R49 is fed back to the pin 6 of the U5: B through the R50, the voltage of the pin 5 of the U5: B is divided by the reference voltage 2.5V of the pin 3 of the U5: A and is added to the pin 5 of the U5: B through the R48R52, if the voltage of the pin 6 of the U5: B is larger than the voltage of the pin 5 of the U5: B, the pin 7 of the U5: B outputs low level, the U3: A is conducted in the forward direction through the D10B, and the voltage of the U3: a and U3: b, through photoelectric coupling, the U2(5) is controlled to prohibit the output of a PWM driving signal, the Q4 is closed, and the power conversion stage stops working, so that the purpose of protection is achieved.

2.4G wireless double-wire dimming and color temperature adjusting functions are realized: the circuit consists of a 3.3V generating circuit U6, a 2.4G wireless receiving chip U7, a signal processing and PWM output chip U7 and a power driving device M6M7M8M 8.

The direct-current voltage is provided for the voltage required by the power driving device M6M7M8M9 during operation, and meanwhile, the direct-current voltage is stabilized by the U6 to obtain 3.3V to supply power for the U7U 8.

The control signal is transmitted in a wireless mode, a transmitted wireless signal is received by an E1(ANTENNA) ANTENNA, enters a U7(8) pin through a C08, is converted into a digital signal through U7 internal processing, is connected with a U8(1) U1(2) U1(3) pin and a U8(1) U2(2) U2(3) pin through a U7(1), and is converted into a four-path PWM (pulse width modulation) signal after being processed in a U8 to drive an M6M7M8M9 power device to work.

R02C05C06CY1 provides the oscillating frequency for U7 work, and R01C02 provides power-on reset for U8.

The LEDA LEDB is two wires connected with the LED lamp, in the four paths of PWM signals output by the U8, pins U8(16) and U8(14) are complementary output groups of PWM signals, and pins U8(13) and U8(17) are complementary output groups of PWM signals.

The pin U8(16) is high level, the pin U8(14) is low level, the current passes through M9LEDB C1-Cn LEDAM6 to the power ground to form a direct current loop, the cold white lamp string is lighted, the lighting time is 40 percent of the total time of the two groups of PWM, then the cold white lamp string enters a dead zone, the dead zone time is 10 percent of the total time of the two groups of PWM,

the pin U8(13) is at high level, the pin U8(17) is at low level, the current passes through M7LEDA W1-Wn LEDBM8 to power ground to form a direct current loop, the warm white lamp string is lighted, the lighting time is 40% of the total time of the two groups of PWM, then the warm white lamp string enters a dead zone, the dead zone time is 10% of the total time of the two groups of PWM,

the two groups of PWM are conducted alternately, the conducting time is microsecond level, the time is extremely short, due to the characteristic of human visual persistence, the lamp string is seen to be always lighted, the duty ratios of the two groups of PWM are respectively adjusted, the color temperature change can be obtained, and meanwhile, the pulse width of the two groups of PWM is adjusted, and the brightness change of the color temperature at the moment can be obtained.

The LEDA LEDB is two wires that LED lamps and lanterns connect, does not have the branch of positive negative pole, does not have the branch of positive and negative direction, and the erection joint is convenient.

A plurality of lamp interfaces CN1-CN5 are reserved in the output stage, so that the diversity and flexibility of the connected lamps can be greatly improved.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A drive power supply for adjusting light and color temperature is characterized by comprising an EMI circuit, a rectifying circuit, a filter circuit, a boost inductor, a PFC corrector, a high-voltage rectifying filter circuit, a PFC switching tube, a PWM controller, a current detection circuit, a rectifying filter circuit, a power conversion circuit, a synchronous rectifying driver, an overcurrent detection circuit, current sampling, voltage sampling, comparison and amplification, a 3.3V generation circuit, a signal processing and PWM output chip and a power drive circuit;

2. The dimming and color temperature-adjusting driving power supply according to claim 1, wherein the step-down transformer is an electromagnetic conversion device.

3. The dimming and color temperature-adjusting driving power supply according to claim 1, wherein the primary and secondary windings of the step-down transformer change the high voltage into the required safe DC voltage through a turn-ratio relationship.

4. The dimming and color temperature-adjusting driving power supply according to claim 1, wherein the power conversion circuit comprises a power switch, a rectifying filter and a step-down transformer.