CN112449461B - Wide-voltage composite dimming constant-voltage power supply circuit - Google Patents
Wide-voltage composite dimming constant-voltage power supply circuit Download PDFInfo
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- CN112449461B CN112449461B CN202011308225.5A CN202011308225A CN112449461B CN 112449461 B CN112449461 B CN 112449461B CN 202011308225 A CN202011308225 A CN 202011308225A CN 112449461 B CN112449461 B CN 112449461B
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- 239000002131 composite material Substances 0.000 title claims description 41
- 238000006243 chemical reaction Methods 0.000 claims abstract description 78
- 150000001875 compounds Chemical class 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 47
- 238000001914 filtration Methods 0.000 claims description 26
- 238000002955 isolation Methods 0.000 claims description 20
- 230000002401 inhibitory effect Effects 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 230000010355 oscillation Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 3
- 238000003079 width control Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
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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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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Abstract
The invention relates to a wide-voltage compound dimming constant-voltage power supply circuit, which comprises: the external phase-cut dimmer is connected in series in the wide-voltage compound dimming constant-voltage power supply circuit and is used for performing front phase-cut dimming and rear phase-cut dimming on an input photoelectric signal; the DC-DC constant voltage conversion circuit is connected with the phase-cut dimmer and is used for performing constant voltage conversion on the photoelectric signal subjected to the dimming of the phase-cut dimmer; the pulse width modulation circuit is connected with the DC-DC constant voltage conversion circuit and is used for carrying out pulse width modulation on the photoelectric signal subjected to constant voltage conversion so as to obtain a wide-voltage photoelectric signal; and the light-emitting device is connected with the pulse wide voltage modulation circuit. The wide-voltage compound dimming constant-voltage power supply circuit can modulate the width of the circuit according to the width, and can perform dimming and constant-voltage control on the circuit so as to finally send out a photoelectric signal of wide-voltage dimming constant-voltage control through the light emitting device.
Description
Technical Field
The invention relates to the technical field of dimming circuits applied to LED illumination, in particular to a wide-voltage compound dimming constant-voltage power supply circuit.
Background
At present, LED lighting products are widely popularized, and especially LED lighting replaces the use of traditional lighting products, and along with the improvement of living standard of people, different lighting requirements are provided for different scenes, especially the brightness and the color temperature of light. However, most products in the market at present can only adjust light or color temperature independently, and cannot meet diversified demands of clients. And the starting and closing of the dimming power supply products in the market when the dimmer is provided have serious inconsistent phenomena. Moreover, different customers apply the requirements of different light brightness required by different scenes.
Disclosure of Invention
The invention aims at the problems in the prior art and provides a wide-voltage compound dimming constant-voltage power supply circuit which can perform phase-cut dimming through a phase-cut dimmer, perform two-way light-emitting modulation and perform constant-voltage conversion on an electric signal, so that the electric signal emits light after being modulated in a modulation mode of wide-voltage, compound dimming and constant-voltage control.
A wide voltage composite dimming constant voltage power supply circuit, the wide voltage composite dimming constant voltage power supply circuit comprising:
the phase-cut dimmer is connected in series in the wide-voltage compound dimming constant-voltage power supply circuit and is used for performing front phase-cut dimming and rear phase-cut dimming on an input electric signal so as to provide an electric signal subjected to phase-cut dimming;
The DC-DC constant voltage conversion circuit is electrically connected with the phase-cut dimmer and is used for performing constant voltage conversion on an electric signal subjected to the dimming of the phase-cut dimmer;
the pulse width modulation circuit is connected with the DC-DC constant voltage conversion circuit and used for carrying out pulse width modulation on the electric signal after constant voltage conversion, and the pulse width modulation circuit comprises two paths of pulse width modulation circuits and is used for controlling the switch of a triode in the pulse width modulation circuit, so that the electric signal with wide input voltage is obtained by adjusting the duty ratio of the electric signal, and further dimming is realized;
The MCU circuit is connected with the phase-cut dimmer, the DC-DC constant voltage conversion circuit and the pulse width modulation circuit and is used for providing control processing;
And the light-emitting device is connected with the pulse width modulation circuit and is used for receiving the electric signal modulated by the phase-cut light modulator and the electric signal modulated by the pulse width modulation circuit so as to emit light.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the EMC circuit is connected with the phase-cut light modulator and used for suppressing interference on an electric signal subjected to light modulation of the phase-cut light modulator;
The full-wave rectifying and filtering circuit is connected with the EMC circuit and is used for rectifying and filtering the whole wave band of the electric signal after interference suppression;
The EMC circuit comprises a piezoresistor, and is used for suppressing lightning surge; the first capacitor and the second capacitor are used for inhibiting differential mode interference; the first differential-mode inductor and the second differential-mode inductor are used for inhibiting differential-mode interference; a discharge resistor and a discharge resistor for preventing oscillation; the common mode inductor and the common mode inductor are used for inhibiting common mode interference; the third capacitor and the fourth capacitor are used for inhibiting common-mode interference;
The full-wave rectifying and filtering circuit rectifies through the rectifying bridge and comprises a pi-shaped filtering circuit consisting of a capacitor and an inductor, the pi-shaped filtering circuit is used for providing energy for the main circuit, and the discharging resistor is used for preventing RC oscillation.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the Step-down conversion circuit is connected with the full-wave rectification filter circuit, and is used for taking electricity from a bus through a first diode to rectify the electricity and is connected to the filter capacitor to finish voltage reduction and power supply;
the Step-down conversion circuit further comprises a control chip for supplying power to the primary side load;
the filter capacitor is connected to the first pin and the second pin of the control chip;
Vcc filter capacitor, obtain smooth direct current through filtering.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the isolation conversion circuit is connected with the Step-down conversion circuit, and the topological structure of the isolation conversion circuit is flyback;
The isolation conversion circuit further comprises a first triode, energy is guaranteed to be transmitted to the secondary stage through adjustment of the duty ratio and the frequency, and the energy is finally transmitted to the output capacitor through the second diode and the third diode.
In one embodiment, the DC-DC constant voltage conversion circuit is connected to the isolation conversion circuit, and the DC-DC constant voltage conversion circuit includes a control chip, a buck inductor, and an output capacitor.
In one embodiment, the wide-voltage composite dimming constant-voltage power supply circuit further comprises a color temperature modulation control circuit, which is used for receiving a control signal of the MCU circuit and providing an electric signal of multiple color temperatures; the color temperature modulation control circuit consists of a switch K1 and peripheral resistance-capacitance thereof, and when the switch is shifted to different gears, the corresponding MCU circuit outputs corresponding signals so as to control the color temperature.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
The half-wave rectification circuit is connected with the EMC circuit and comprises a fourth diode and a capacitor, and is used for rectifying alternating current into direct current.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
And the phase-cutting angle-to-pulse width modulation signal circuit is connected with the half-wave rectification circuit, converts the phase-cutting angle into a pulse width modulation signal and transmits the pulse width modulation signal to the secondary micro-control processor through the optical coupler control chip.
In one embodiment, the pulse width modulation circuit further comprises:
The first path of pulse width modulation control circuit is connected with the DC-DC constant voltage conversion circuit, comprises a third triode and a peripheral driving circuit, and controls the switch of the third triode according to the driving signal of the MCU circuit so as to control the dimming of the path;
the second path of pulse width modulation control circuit is connected with the DC-DC constant voltage conversion circuit and mainly comprises a fourth triode and a peripheral driving circuit, and a driving signal of the MCU circuit controls the switch of the fourth triode so as to control the dimming of the path;
The light emitting device further includes:
The first path of light-emitting device is connected with the first path of pulse width modulation control circuit, and mainly used as a load of the first path of light-emitting device and can be an LED light-emitting source such as a lamp strip, a module and the like;
The second path of light-emitting device is connected with the second path of pulse width control circuit, mainly comprises an LED load, realizes dimming by controlling the duty ratio of the third triode and the fourth triode, and realizes color temperature adjustment by controlling the proportion of the third triode and the fourth triode.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the 0/1-10V dimmer is connected with the MCU circuit;
the 0/1-10V isolation dimming circuit is connected with the MCU circuit, converts 0/1-10V analog signals into AD signals which can be identified by the singlechip, and controls the first triode and the second triode through pulse width modulation signals so as to realize dimming;
The 3.3V or 5.5V voltage-stabilizing power supply circuit is connected with the MCU circuit and used for providing voltage-stabilizing power supply;
And the linear voltage-reducing and stabilizing circuit is connected with the 3.3V or 5.5V voltage-stabilizing power supply circuit and is used for driving the first triode and the second triode.
The beneficial effects are that:
A wide voltage, compound dimming constant voltage power supply circuit, the circuit comprising: the phase-cut dimmer is connected in series in the wide-voltage compound dimming constant-voltage power supply circuit and is used for performing front phase-cut dimming and rear phase-cut dimming on an input electric signal; the DC-DC constant voltage conversion circuit is electrically connected with the phase-cut dimmer and is used for performing constant voltage conversion on an electric signal subjected to the dimming of the phase-cut dimmer; the pulse width modulation circuit is connected with the DC-DC constant voltage conversion circuit and is used for carrying out pulse width modulation on the electric signal after constant voltage conversion, and the electric signal with wide input voltage is obtained by adjusting the duty ratio of the electric signal; the MCU circuit is connected with the phase-cut dimmer, the DC-DC constant voltage conversion circuit and the pulse width modulation circuit and is used for providing control processing; the color temperature modulation control circuit is used for receiving the control signal of the MCU circuit and providing an electric signal with multiple color temperatures according to the electric signal with the wide input voltage; and the light-emitting device is connected with the pulse wide voltage modulation circuit and is used for emitting light according to the optical signal regulated by the phase-cut light modulator and the electric signal with the multi-gear color temperature. The wide-voltage compound dimming constant-voltage power supply circuit performs phase-cut dimming through a phase-cut dimmer, performs two-way light-emitting modulation, and performs constant-voltage conversion on an electric signal, so that the electric signal emits light after being modulated in a modulation mode of wide-voltage, compound dimming and constant-voltage control.
Drawings
Fig. 1 is a schematic circuit diagram of a wide-voltage composite dimming constant-voltage power supply circuit according to the present invention.
Fig. 2 is a program execution diagram of an MCU circuit of the wide voltage composite dimming constant voltage power supply circuit of the present invention.
Fig. 3 is a flowchart of a tangential dimming procedure of a wide-voltage composite dimming constant-voltage power supply circuit according to the present invention.
Fig. 4 is a schematic circuit diagram of a phase-cut dimmer of a wide-voltage composite dimming constant-voltage power supply circuit according to the present invention.
Fig. 5 is a schematic circuit diagram of a Step-down conversion circuit of the wide-voltage composite dimming constant-voltage power supply circuit of the present invention.
Fig. 6 is a schematic circuit diagram of an isolation conversion circuit of the wide-voltage composite dimming constant-voltage power supply circuit of the present invention.
Fig. 7 is a schematic circuit diagram of a DC-DC constant voltage conversion circuit of a wide voltage composite dimming constant voltage power supply circuit according to the present invention.
Fig. 8 is a schematic circuit diagram of a pulse width modulation circuit and a light emitting device of a wide voltage composite dimming constant voltage power supply circuit according to the present invention.
Fig. 9 is a schematic circuit diagram of a half-wave rectifier circuit of a wide-voltage composite dimming constant-voltage power supply circuit according to the present invention.
Fig. 10 is a circuit schematic diagram of an MCU circuit of a wide-voltage hybrid dimming constant voltage power supply circuit according to the present invention.
Fig. 11 is a schematic circuit diagram of a 0/1-10V dimmer of a wide-voltage composite dimming constant voltage power supply circuit according to the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that, the sequence number of each step in this embodiment does not mean the execution sequence, and the execution sequence of each process should be determined by its function and internal logic, and should not limit the implementation process of the embodiment of the present application in any way.
Example 1
Referring to fig. 1, a wide-voltage composite dimming constant voltage power supply circuit includes:
the phase-cut dimmer 1 is connected in series in the wide-voltage compound dimming constant-voltage power supply circuit and is used for performing front phase-cut dimming and rear phase-cut dimming on an input electric signal so as to provide an electric signal subjected to phase-cut dimming;
A DC-DC constant voltage conversion circuit 6 electrically connected to the phase cut dimmer and configured to perform constant voltage conversion on an electric signal after dimming the phase cut dimmer;
the pulse width modulation circuit is connected with the DC-DC constant voltage conversion circuit and used for carrying out pulse width modulation on the electric signal after constant voltage conversion, and the pulse width modulation circuit comprises two paths of pulse width modulation circuits and is used for controlling the switch of a triode in the pulse width modulation circuit, so that the electric signal with wide input voltage is obtained by adjusting the duty ratio of the electric signal, and further dimming is realized;
An MCU circuit 13 connected to the phase cut dimmer, the DC-DC constant voltage conversion circuit and the pulse width modulation circuit for providing control processing;
And the light-emitting device is connected with the pulse width modulation circuit and is used for receiving the electric signal modulated by the phase-cut light modulator and the electric signal modulated by the pulse width modulation circuit so as to emit light.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
The EMC circuit 2 is connected with the phase-cut dimmer and is used for suppressing interference on an electric signal subjected to the dimming of the phase-cut dimmer;
The full-wave rectifying and filtering circuit 3 is connected with the EMC circuit and is used for rectifying and filtering the whole wave band of the electric signal after interference suppression;
The EMC circuit comprises a piezoresistor, and is used for suppressing lightning surge; the first capacitor and the second capacitor are used for inhibiting differential mode interference; the first differential-mode inductor and the second differential-mode inductor are used for inhibiting differential-mode interference; a discharge resistor and a discharge resistor for preventing oscillation; the common mode inductor and the common mode inductor are used for inhibiting common mode interference; the third capacitor and the fourth capacitor are used for inhibiting common-mode interference;
The full-wave rectifying and filtering circuit rectifies through the rectifying bridge and comprises a pi-shaped filtering circuit consisting of a capacitor and an inductor, the pi-shaped filtering circuit is used for providing energy for the main circuit, and the discharging resistor is used for preventing RC oscillation.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
The Step-down conversion circuit 4 is connected with the full-wave rectification filter circuit, and is used for taking electricity from a bus through a first diode to rectify, connecting to a filter capacitor and completing voltage reduction and power supply;
the Step-down conversion circuit further comprises a control chip for supplying power to the primary side load;
the filter capacitor is connected to the first pin and the second pin of the control chip;
Vcc filter capacitor, obtain smooth direct current through filtering.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the isolation conversion circuit 5 is connected with the Step-down conversion circuit, and the topological structure of the isolation conversion circuit is flyback;
The isolation conversion circuit further comprises a first triode, energy is guaranteed to be transmitted to the secondary stage through adjustment of the duty ratio and the frequency, and the energy is finally transmitted to the output capacitor through the second diode and the third diode.
In one embodiment, the DC-DC constant voltage conversion circuit is connected to the isolation conversion circuit, and the DC-DC constant voltage conversion circuit includes a control chip, a buck inductor, and an output capacitor.
In one embodiment, the wide-voltage composite dimming constant-voltage power supply circuit further comprises a color temperature modulation control circuit 14, which receives a control signal of the MCU circuit and is used for providing an electric signal with multiple color temperatures; the color temperature modulation control circuit consists of a switch K1 and peripheral resistance-capacitance thereof, and when the switch is shifted to different gears, the corresponding MCU circuit outputs corresponding signals so as to control the color temperature.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the half-wave rectifying circuit 11 is connected with the EMC circuit and comprises a fourth diode and a capacitor for rectifying the alternating current into direct current.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
The phase-cut angle-to-pulse width modulation signal circuit 12 is connected with the half-wave rectification circuit, converts the phase-cut angle into a pulse width modulation signal, and transmits the pulse width modulation signal to the secondary micro-control processor through the optocoupler control chip.
In one embodiment, the pulse width modulation circuit further comprises:
The first path of pulse width modulation control circuit 7 is connected with the DC-DC constant voltage conversion circuit, comprises a third triode and a peripheral driving circuit, and controls the switch of the third triode according to the driving signal of the MCU circuit so as to control the dimming of the path;
The second path pulse width modulation control circuit 9 is connected with the DC-DC constant voltage conversion circuit and mainly comprises a fourth triode and a peripheral driving circuit, and a driving signal of the MCU circuit controls the switch of the fourth triode so as to control the dimming of the path;
The light emitting device further includes:
The first path of light-emitting device 8 is connected with the first path of pulse width modulation control circuit, and mainly is a first path of light-emitting device load, and can be an LED light-emitting source such as a lamp strip, a module and the like;
The second light-emitting device 10 is connected with the second pulse width control circuit, mainly is an LED load, and is used for realizing dimming by controlling the duty ratio of the third triode and the fourth triode, and for realizing color temperature adjustment by controlling the ratio of the third triode and the fourth triode.
In one embodiment, the wide-voltage composite dimming constant voltage power supply circuit further includes:
the 0/1-10V dimmer is connected with the MCU circuit;
the 0/1-10V isolation dimming circuit is connected with the MCU circuit, converts 0/1-10V analog signals into AD signals which can be identified by the singlechip, and controls the first triode and the second triode through pulse width modulation signals so as to realize dimming;
The 3.3V or 5.5V voltage-stabilizing power supply circuit is connected with the MCU circuit and used for providing voltage-stabilizing power supply;
And the linear voltage-reducing and stabilizing circuit is connected with the 3.3V or 5.5V voltage-stabilizing power supply circuit and is used for driving the first triode and the second triode.
A wide voltage, compound dimming constant voltage power supply circuit, the circuit comprising: the phase-cut dimmer is connected in series in the wide-voltage compound dimming constant-voltage power supply circuit and is used for performing front phase-cut dimming and rear phase-cut dimming on an input electric signal; the DC-DC constant voltage conversion circuit is electrically connected with the phase-cut dimmer and is used for performing constant voltage conversion on an electric signal subjected to the dimming of the phase-cut dimmer; the pulse width modulation circuit is connected with the DC-DC constant voltage conversion circuit and is used for carrying out pulse width modulation on the electric signal after constant voltage conversion, and the electric signal with wide input voltage is obtained by adjusting the duty ratio of the electric signal; the MCU circuit is connected with the phase-cut dimmer, the DC-DC constant voltage conversion circuit and the pulse width modulation circuit and is used for providing control processing; the color temperature modulation control circuit is used for receiving the control signal of the MCU circuit and providing an electric signal with multiple color temperatures according to the electric signal with the wide input voltage; and the light-emitting device is connected with the pulse wide voltage modulation circuit and is used for emitting light according to the optical signal regulated by the phase-cut light modulator and the electric signal with the multi-gear color temperature. The wide-voltage compound dimming constant-voltage power supply circuit performs phase-cut dimming through a phase-cut dimmer, performs two-way light-emitting modulation, and performs constant-voltage conversion on an electric signal, so that the electric signal emits light after being modulated in a modulation mode of wide-voltage, compound dimming and constant-voltage control.
Example 2
In an exemplary embodiment, referring to fig. 4, a wide-voltage composite dimming constant voltage power circuit specifically includes:
the external phase-cut dimmer comprises a front phase-cut dimmer and a rear phase-cut dimmer, wherein the phase-cut dimmer 1 is connected in series in a circuit;
The EMC circuit 2 is connected with the external phase-cut dimmer 1 and comprises a piezoresistor RV1 for suppressing lightning surge; a first capacitor CX1 and a second capacitor CX2 for suppressing differential mode interference; the first differential-mode inductor L7 and the second differential-mode inductor L8 are used for inhibiting differential-mode interference; a discharge resistor R105 and a discharge resistor R106 for preventing RC oscillation; common-mode inductance FL1 and common-mode inductance FL2 for suppressing common-mode interference; third capacitors CY1 and CY2 for suppressing common mode interference;
The full-wave rectifying and filtering circuit 3 is connected with the EMC circuit 2, and rectifies the full-wave rectifying and filtering circuit into direct-current input alternating current through a rectifying bridge BD1, and comprises a pi-type filtering circuit consisting of CBB capacitors C2 and C1 and an inductor L1, and is used for providing energy for a main circuit, and a discharging resistor R5 is used for preventing RC oscillation.
In one embodiment, in conjunction with fig. 5, the circuit further comprises:
The Step-down conversion circuit 4 is connected with the full-wave rectification filter circuit 3, and is used for taking electricity from a bus through a diode D3, rectifying and connecting to a filter capacitor EC1 to finish input power supply and power taking;
The Step-down conversion circuit also comprises a control chip U1 which supplies Vcc and Vcc1 for the primary side load;
A filter capacitor C8 connected to PINs PIN1 and PIN2 of the U1;
Vcc filter capacitor EC2, and a smooth DC power is obtained by filtering.
In one embodiment, in conjunction with fig. 6, the circuit further comprises:
The isolation conversion circuit 5 is connected with the Step-down conversion circuit 4, has a flyback topological structure, and is a transformer T1 for converting energy;
the isolation conversion circuit 5 further comprises a triode Q1, the triode Q1 is NMOS, energy is guaranteed to be transmitted to the secondary stage through adjusting the duty ratio and the frequency, and the energy is finally transmitted to the output capacitors EC4 and EC5 through the diode D10 and the diode D11.
In one embodiment, in conjunction with fig. 7, the circuit further comprises:
And a DC-DC constant voltage conversion circuit 6 connected with the isolation conversion circuit 5, wherein the DC-DC constant voltage conversion circuit comprises a control chip U6, a step-down inductor L3 and an output capacitor EC6.
Note that, the model of the U6 control chip is RT6365GSP.
In one embodiment, in conjunction with fig. 8, the circuit further comprises:
the first path of PWM control circuit 7 is connected with the DC-DC constant voltage conversion circuit 6 and comprises Q6 and a peripheral driving circuit thereof, and the driving signal of the MCU controls the switch of the Q6 so as to control the dimming of the path;
the second path PWM control circuit 9 is connected with the DC-DC constant voltage conversion circuit 6 and mainly comprises Q7 and a peripheral driving circuit thereof, and a driving signal of the MCU controls the switching of the Q7 so as to control the dimming of the path.
Continuing with fig. 8, in one embodiment, the circuit further comprises:
the first path of light-emitting device 8 is connected with the first path of PWM control circuit 7, and mainly is an LED device load, and can be an LED light-emitting source such as a lamp belt, a module and the like;
the second light emitting device 10 is connected with the second PWM control circuit 9, mainly an LED load, and is used for dimming by controlling the duty ratio of the transistor Q6 and the transistor Q7, and for dimming the color temperature by controlling the ratio of the transistors Q6 and Q7.
Referring to fig. 1, in one embodiment, the circuit further includes:
the half-wave rectifier circuit 11 is connected to the EMC circuit and is composed of diodes D1 and D2 and a capacitor C14, and rectifies the alternating current into direct current.
Referring to fig. 9, in one embodiment, the circuit further includes:
the phase-cutting angle-converting PWM signal circuit 12 is connected with the half-wave rectifying circuit 11 and consists of U3, U4 and peripheral resistance-capacitance thereof, converts the phase-cutting angle into PWM signals and transmits the PWM signals to the secondary MCU through the optocoupler U4.
The model of the U3 chip is LM258 or LM358, and the model of the U4 chip is BP8519C.
Referring to fig. 10, in one embodiment, the circuit further includes:
The MCU circuit 13 comprises a clock circuit R101 and a clock circuit C51 for providing a clock signal for the MCU, and a2 nd pin INPWM which is a phase-cut PWM input signal and can detect a phase-cut angle; PO 1-PO 5 are combined into five-gear signals, different gears correspond to different color temperatures, the 9 th foot AD signal detects 0-10V analog input, the 10 th foot AD1 is used for detecting an overcurrent signal, PWM1 and PWM2 are control signals, the output MOS tubes Q6 and Q7 are respectively controlled, and dimming and color temperature adjustment can be achieved through controlling the Q6 and the Q7.
With continued reference to fig. 1, the circuit further includes a fifth-gear palette control circuit 14, which is connected to the MCU circuit.
Referring to fig. 1 and 11, in one embodiment, the circuit further includes:
a 0/1-10V dimmer 15 is externally connected with the MCU circuit;
The 0/1-10V isolation circuit 16 is connected with the MCU circuit and consists of T2 and peripheral resistance-capacitance thereof, the 0/1-10V analog signal is converted into an AD signal which can be identified by a single chip through T2, and the MCU controls triodes Q6 and Q7 through PWM signals so as to realize dimming;
a 3.3V or 5.5V regulated power supply circuit 18 connected with the MCU circuit;
and the linear step-down voltage stabilizing circuit 17 is connected with the 3.3V or 5.5V voltage stabilizing power supply circuit, is converted into 12V with the main output through the triodes Q3 and ZD4 and is used for driving the triodes Q6 and Q7.
In one embodiment, the circuit further comprises a 5V voltage stabilizing circuit, and 12V is converted into 5V through U7 and used for supplying power to the singlechip; u9 and peripheral resistance-capacitance components thereof; the over-power detection circuit 19 converts the over-current signal into an AD1 signal and then sends the AD1 signal to the MCU, so that Q6 and Q7 are controlled to realize over-power protection; an expansion port 20, mainly for expanding functions; the programming port 21 is used for programming the MCU.
In this embodiment, U7 is a control chip with a model 78L 05; u9 is a control chip with model LM258 or LM 358.
The invention provides a wide-voltage compound dimming constant-voltage power supply circuit, which comprises: the external phase-cut light modulator is connected in series in the circuit and comprises front phase-cut light modulator and rear phase-cut light modulator; an EMC circuit comprising a varistor RV1 for suppressing lightning surges; a first capacitor CX1 and a second capacitor CX2 for suppressing differential mode interference; the first differential-mode inductor L7 and the second differential-mode inductor L8 are used for inhibiting differential-mode interference; a discharge resistor R105 and a discharge resistor R106 for preventing RC oscillation; common-mode inductance FL1 and common-mode inductance FL2 for suppressing common-mode interference; third capacitors CY1 and CY2 for suppressing common mode interference; the full-wave rectifying and filtering circuit is rectified into direct current input alternating current through a rectifying bridge BD1 and comprises a pi-type filtering circuit consisting of CBB capacitors C2 and C1 and an inductor L1, the pi-type filtering circuit is used for providing energy for a main circuit, and a discharging resistor R5 is used for preventing RC oscillation. The wide-voltage composite dimming power supply circuit can select a conversion power supply device according to different commercial power systems, different color temperature requirements, different dimming modes, inconsistent starting and closing, different dimming smoothness and intelligent requirements.
Referring to fig. 2, it should be noted that the MCU circuit of this circuit also executes the following main loop procedure:
Initializing a system;
judging whether a 0-10V dimmer is connected or not;
if yes, entering a 0-10V dimmer execution program;
If not, pressing down the tangential dimmer;
If yes, entering a tangential dimming execution program;
if not, the non-dimmer is connected to output the maximum power within 0.5 s.
Referring to fig. 3, it should be noted that the circuit further executes a tangential dimming execution program, including:
ADC0-10V sampling and filtering treatment;
Detecting the output overcurrent of the ADC;
detecting and processing a dial switch;
PWM output power control.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.
Claims (8)
1. A wide-voltage composite dimming constant voltage power supply circuit, characterized in that the wide-voltage composite dimming constant voltage power supply circuit comprises:
the phase-cut dimmer is connected in series in the wide-voltage compound dimming constant-voltage power supply circuit and is used for performing front phase-cut dimming and rear phase-cut dimming on an input electric signal so as to provide an electric signal subjected to phase-cut dimming;
The DC-DC constant voltage conversion circuit is electrically connected with the phase-cut dimmer and is used for performing constant voltage conversion on an electric signal subjected to the dimming of the phase-cut dimmer;
the pulse width modulation circuit is connected with the DC-DC constant voltage conversion circuit and used for carrying out pulse width modulation on the electric signal after constant voltage conversion, and the pulse width modulation circuit comprises two paths of pulse width modulation circuits and is used for controlling the switch of a triode in the pulse width modulation circuit, so that the electric signal with wide input voltage is obtained by adjusting the duty ratio of the electric signal, and further dimming is realized;
The MCU circuit is connected with the phase-cut dimmer, the DC-DC constant voltage conversion circuit and the pulse width modulation circuit and is used for providing control processing;
The light-emitting device is connected with the pulse width modulation circuit and is used for receiving the electric signal modulated by the phase-cut dimmer and the electric signal modulated by the pulse width modulation circuit so as to emit light;
the wide-voltage composite dimming constant-voltage power supply circuit further comprises:
the EMC circuit is connected with the phase-cut light modulator and used for suppressing interference on an electric signal subjected to light modulation of the phase-cut light modulator;
The full-wave rectifying and filtering circuit is connected with the EMC circuit and is used for rectifying and filtering the whole wave band of the electric signal after interference suppression;
The EMC circuit comprises a piezoresistor, and is used for suppressing lightning surge; the first capacitor and the second capacitor are used for inhibiting differential mode interference; the first differential-mode inductor and the second differential-mode inductor are used for inhibiting differential-mode interference; a first discharge resistor and a second discharge resistor for preventing an oscillation action; the common mode inductor and the common mode inductor are used for inhibiting common mode interference; the third capacitor and the fourth capacitor are used for inhibiting common-mode interference;
the full-wave rectifying and filtering circuit rectifies through a rectifying bridge, the full-wave rectifying and filtering circuit comprises a pi-shaped filtering circuit consisting of a capacitor and an inductor and is used for providing energy for a main circuit, and the third discharging resistor is used for preventing RC oscillation;
the wide-voltage compound dimming constant-voltage power supply circuit further comprises a color temperature modulation control circuit, which is used for receiving a control signal of the MCU circuit and providing an electric signal with multiple color temperatures; the color temperature modulation control circuit consists of a switch K1 and peripheral resistance-capacitance thereof, and when the switch is shifted to different gears, the corresponding MCU circuit outputs corresponding signals so as to control the color temperature.
2. The wide-voltage composite dimming constant voltage power supply circuit as claimed in claim 1, further comprising:
the Step-down conversion circuit is connected with the full-wave rectification filter circuit, and is used for taking electricity from a bus through a first diode to rectify the electricity and is connected to the filter capacitor to finish voltage reduction and power supply;
the Step-down conversion circuit further comprises a control chip for supplying power to the primary side load;
the filter capacitor is connected to the first pin and the second pin of the control chip;
Vcc filter capacitor, obtain smooth direct current through filtering.
3. The wide-voltage composite dimming constant voltage power supply circuit according to claim 2, further comprising:
the isolation conversion circuit is connected with the Step-down conversion circuit, and the topological structure of the isolation conversion circuit is flyback;
The isolation conversion circuit further comprises a first triode, energy is guaranteed to be transmitted to the secondary stage through adjustment of the duty ratio and the frequency, and the energy is finally transmitted to the output capacitor through the second diode and the third diode.
4. The wide-voltage composite dimming constant voltage power supply circuit as claimed in claim 3, wherein the DC-DC constant voltage conversion circuit is connected to the isolation conversion circuit, and comprises a control chip, a buck inductor and an output capacitor.
5. The wide-voltage composite dimming constant voltage power supply circuit as claimed in claim 1, further comprising:
The half-wave rectification circuit is connected with the EMC circuit and comprises a fourth diode and a capacitor, and is used for rectifying alternating current into direct current.
6. The wide-voltage composite dimming constant voltage power supply circuit as claimed in claim 5, further comprising:
And the phase-cutting angle-to-pulse width modulation signal circuit is connected with the half-wave rectification circuit, converts the phase-cutting angle into a pulse width modulation signal and transmits the pulse width modulation signal to the secondary micro-control processor through the optical coupler control chip.
7. The wide-voltage composite dimming constant voltage power supply circuit according to claim 1, wherein the pulse width modulation circuit further comprises:
The first path of pulse width modulation control circuit is connected with the DC-DC constant voltage conversion circuit, comprises a third triode and a peripheral driving circuit, and controls the switch of the third triode according to the driving signal of the MCU circuit so as to control the dimming of the path;
The second path of pulse width modulation control circuit is connected with the DC-DC constant voltage conversion circuit and comprises a fourth triode and a peripheral driving circuit, and the switching of the fourth triode is controlled according to the driving signal of the MCU circuit so as to control the dimming of the path;
The light emitting device further includes:
The first path of light-emitting device is connected with the first path of pulse width modulation control circuit and is an LED light-emitting source;
and the second path of light-emitting device is connected with the second path of pulse width control circuit, is an LED load, realizes dimming by controlling the duty ratio of the third triode and the fourth triode, and realizes color temperature adjustment by controlling the proportion of the third triode and the fourth triode.
8. The wide-voltage composite dimming constant voltage power supply circuit as claimed in claim 1, further comprising:
the 0/1-10V dimmer is connected with the MCU circuit;
the 0/1-10V isolation dimming circuit is connected with the MCU circuit, converts 0/1-10V analog signals into AD signals which can be identified by the singlechip, and controls the first triode and the second triode through pulse width modulation signals so as to realize dimming;
The 3.3V or 5.5V voltage-stabilizing power supply circuit is connected with the MCU circuit and used for providing voltage-stabilizing power supply;
And the linear voltage-reducing and stabilizing circuit is connected with the 3.3V or 5.5V voltage-stabilizing power supply circuit and is used for driving the first triode and the second triode.
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| CN102821526B (en) * | 2012-09-05 | 2015-09-09 | 浙江大学 | The circuit of LED electrical pressure adaptive PWM light modulation is realized under constant-current source pre-driver |
| CN105072782B (en) * | 2015-09-11 | 2017-08-04 | 东莞华明灯具有限公司 | A kind of circuit and method by 0 10V analog signals, two road lighting lanterns of control |
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