CN117939739A - High-power digital dimming circuit, PCB and driving power supply - Google Patents
High-power digital dimming circuit, PCB and driving power supply Download PDFInfo
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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
- H05B45/345—Current stabilisation; Maintaining constant current
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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
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
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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
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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Abstract
The application discloses a high-power digital dimming circuit, a PCB (printed circuit board) and a driving power supply, wherein the high-power digital dimming circuit comprises an input unit, an output unit, a signal processing unit, a control unit and a switch driving unit, the input unit comprises an upper conducting part and a lower conducting part, the output end and a power supply end of the input unit are respectively and correspondingly connected with the input end of the output unit and the boosting end of the control unit, the input end of the signal processing unit is used for receiving DALI dimming signals, the output end of the signal processing unit is respectively connected with the digital signal end of the control unit and the input end of the switch driving unit, and the output end of the control unit is respectively connected with the control end of the upper conducting part and the control end of the lower conducting part; the output end of the switch driving unit is connected with the output unit; the high-power digital dimming circuit disclosed by the application can realize direct digital port receiving instruction or sending instruction, and has the advantages of high control precision and low manufacturing cost.
Description
Technical Field
The invention relates to the technical field of driving circuits, in particular to a high-power digital dimming circuit, a PCB and a driving power supply.
Background
With the development of the lighting technology of the LED lamp, the LED lamp has been widely applied to occasions such as trade, office, business and the like; the important components of the LED lamp comprise a driving power supply, and the quality of the driving power supply directly restricts the stability and reliability of the LED lamp during working.
The driving power supply of the LED lamp is a power supply converter which converts power supply into specific voltage and current to drive the LEDs to emit light; the driving power supply can be divided into two main types according to the driving mode, namely a constant-current driving power supply and a voltage-stabilizing driving power supply, and the basic principle of the voltage-stabilizing power supply is that the output voltage is kept at a fixed value through negative feedback control; negative feedback means sampling a part of the signal from the output terminal, comparing with a reference voltage, and adjusting the output voltage by the control circuit; when the output voltage changes, the negative feedback control circuit automatically adjusts the input voltage so that the output voltage is restored to a set value.
The common voltage stabilizing circuit comprises a linear voltage stabilizing circuit and a switching voltage stabilizing circuit, wherein the switching voltage stabilizing circuit is a voltage stabilizing mode for controlling output voltage by using a switching device, specifically, the input voltage is switched at high frequency by the switching device, and stable direct current voltage is obtained through an LC filter.
The existing voltage-stabilizing driving power supply generally adopts analog control, namely, class detection signals are adopted, AD functions are utilized to convert and judge the signals into controllable signals in the MCU, and then judgment and control are carried out, so that the problems of low control accuracy and high production cost exist; the existing voltage-stabilizing driving power supply has the problem of low working power, and the application range of the driving power supply is narrowed.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a high-power digital dimming circuit which can realize direct digital instruction receiving and sending and has the advantages of high control precision and low manufacturing cost.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The high-power digital dimming circuit comprises an input unit, an output unit, a signal processing unit, a control unit and a switch driving unit, wherein the input unit comprises an upper conducting part and a lower conducting part, the input end of the input unit is used for being connected with an external power supply mechanism, the output end and the power supply end of the input unit are respectively and correspondingly connected with the input end of the output unit and the boosting end of the control unit, the input end of the signal processing unit is used for receiving DALI dimming signals, the output end of the signal processing unit is respectively connected with the digital signal end of the control unit and the input end of the switch driving unit, and the output end of the control unit is respectively connected with the control end of the upper conducting part and the control end of the lower conducting part; the output end of the switch driving unit is connected with the output unit, and the output end of the output unit is used for being connected with the lighting device.
In the high-power digital dimming circuit, the input unit further comprises a first filtering part, a first rectifying part, a second filtering part, a first conducting part and an output induction part, wherein the input end of the first filtering part is used for being connected with an external power supply mechanism, the output end of the first filtering part is connected with the input end of the first rectifying part, the output end of the first rectifying part is connected with the input end of the second filtering part, the output end of the second filtering part is connected with the upper conducting part, and the output end of the output induction part is respectively connected with the input end of the output unit and the power supply end of the control unit; the first conducting part is respectively connected with the output end of the control unit and the second filtering part, and the upper conducting part and the lower conducting part are respectively connected with the input end of the output sensing part.
In the high-power digital dimming circuit, the input unit further comprises a detection part, the input end of the detection part is connected with the first filtering part, and the output end of the detection part is connected with the input end of the signal processing unit.
In the high-power digital dimming circuit, the control unit comprises a boosting part and a control part, wherein the boosting end of the boosting part is connected with the power supply end of the second filtering part, the power supply end of the boosting part is connected with the input end of the control part, the output end of the boosting part is connected with the control end of the first conducting part, the digital signal end of the control part is connected with the output end of the signal processing unit, and the output end of the control part is respectively connected with the control end of the upper conducting part and the control end of the lower conducting part; the power supply end of the control part is respectively connected with the output end of the output induction part, the power supply end of the signal processing unit and the power supply end of the switch driving unit.
In the high-power digital dimming circuit, the output unit comprises a second rectifying part, a third filtering part and a voltage stabilizing part, wherein the input end of the second rectifying part is connected with the output end of the input unit, the output end of the second rectifying part is connected with the input end of the third filtering part, the output end of the third filtering part is used for being connected with a lighting device, the input end of the voltage stabilizing part is connected with the output end of the switch driving unit, and the output end of the voltage stabilizing part is connected with the third filtering part.
In the high-power digital dimming circuit, the output unit further comprises a feedback part, the input end of the feedback part is connected with the third filtering part, and the output end of the feedback part is connected with the input end of the control unit.
In the high-power digital dimming circuit, the switch driving unit comprises a first voltage reduction part, a signal amplification part and an isolation part, wherein the input end of the first voltage reduction part is connected with the third filtering part, the output end of the first voltage reduction part is respectively connected with the power supply end of the signal amplification part and the power supply end of the isolation part, the input end of the isolation part is connected with the output end of the signal processing unit, the output end of the isolation part is connected with the input end of the signal amplification part, and the output end of the signal amplification part is connected with the input end of the voltage stabilizing part.
In the high-power digital dimming circuit, the signal processing unit comprises a second voltage reduction part and a signal processing part, wherein the input end of the second voltage reduction part is connected with the power supply end of the control unit, and the output end of the second voltage reduction part is connected with the power supply end of the signal processing part; the input end of the signal processing part is used for receiving the DALI dimming signal, and the output end of the signal processing part is respectively connected with the input end of the switch driving unit and the digital signal end of the control unit.
The invention also correspondingly provides a PCB board on which the high-power digital dimming circuit is printed.
The invention also correspondingly provides a driving power supply which adopts the high-power digital dimming circuit to realize the work control.
The beneficial effects are that:
The invention provides a high-power digital dimming circuit, wherein a signal processing unit receives a DALI dimming signal and demodulates the DALI dimming signal, then outputs the DALI dimming signal to a control unit and a switch driving unit, adjusts working states of an upper conducting part and a lower conducting part through the control unit to realize constant current dimming, and outputs a PWM signal to an output unit through the switch driving unit to ensure that the output voltage is kept constant; the output end of the signal processing unit is connected with the digital signal end of the control unit, so that the direct digital port can receive the instruction or send the instruction, the functions of monitoring, controlling, reporting and dimming are realized, the layer-by-layer conversion control of converting digital into analog or converting analog into digital is avoided, the error and the loss or interference before the signal conversion are avoided, and the control precision is improved; furthermore, no additional conversion hardware is needed, and no additional detection return circuit is needed, so that the manufacturing cost of the driving power supply is greatly reduced.
Drawings
FIG. 1 is a circuit block diagram of a high-power digital dimming circuit provided by the invention;
FIG. 2 is a circuit diagram of an input unit according to the present invention;
FIG. 3 is a circuit diagram of a control unit according to the present invention;
fig. 4 is a circuit configuration diagram of an output unit according to the present invention;
fig. 5 is a circuit configuration diagram of a signal processing unit provided by the present invention;
fig. 6 is a circuit configuration diagram of a switch driving unit provided by the present invention.
Description of main reference numerals: 1-input unit, 11-first filter section, 12-first rectifier section, 13-second filter section, 14-first conduction section, 15-output induction section, 16-upper conduction section, 17-lower conduction section, 18-detection section, 2-output unit, 21-second rectifier section, 22-third filter section, 23-voltage stabilizing section, 24-feedback section, 3-signal processing unit, 31-second step-down section, 32-signal processing section, 4-control unit, 41-step-up section, 42-control section, 5-switch driving unit, 51-first step-down section, 52-signal amplifying section, 53-isolation section.
Detailed Description
The invention provides a high-power digital dimming circuit, a PCB and a driving power supply, which are used for making the purposes, the technical scheme and the effects of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and the embodiments.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and the like should be construed broadly, and that the specific meaning of the terms in the present invention may be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 6, the present invention provides a high-power digital dimming circuit, which includes an input unit 1, an output unit 2, a signal processing unit 3, a control unit 4 and a switch driving unit 5, wherein the input unit 1 includes an upper conducting portion 16 and a lower conducting portion 17, an input end of the input unit 1 is used for connecting an external power supply mechanism, an output end and a power supply end of the input unit 1 are respectively connected with an input end of the output unit 2 and a boost end of the control unit 4, an input end of the signal processing unit 3 is used for receiving a DALI dimming signal, an output end of the signal processing unit 3 is respectively connected with a digital signal end of the control unit 4 and an input end of the switch driving unit 5, and an output end of the control unit 4 is respectively connected with a control end of the upper conducting portion 16 and a control end of the lower conducting portion 17; the output end of the switch driving unit 5 is connected with the output unit 2, and the output end of the output unit 2 is used for being connected with a lighting device.
The invention discloses a high-power digital dimming circuit, wherein a signal processing unit 3 receives a DALI dimming signal and demodulates the DALI dimming signal, then outputs the DALI dimming signal to a control unit 4 and a switch driving unit 5, adjusts working states of an upper conducting part 16 and a lower conducting part 17 through the control unit 4 to realize constant current dimming, and outputs a PWM signal to an output unit 2 through the switch driving unit 5 to ensure that the output voltage is kept constant; the output end of the signal processing unit 3 is connected with the digital signal end of the control unit 4, so that the direct digital port can receive the instruction or send the instruction, and the functions of monitoring, controlling, reporting and dimming are realized, the layer-by-layer conversion control of converting digital into analog or analog into digital is avoided, the error and the loss or interference before the signal conversion are avoided, and the control precision is improved; furthermore, no additional conversion hardware is needed, and no additional detection return circuit is needed, so that the manufacturing cost of the driving power supply is greatly reduced; still further, the whole LLC framework-based dimming circuit can realize high-power operation, and the application range of a driving power supply and the flexibility in operation are improved.
Further, referring to fig. 1 and 2, the input unit 1 further includes a first filtering portion 11, a first rectifying portion 12, a second filtering portion 13, a first conducting portion 14, and an output sensing portion 15, where an input end of the first filtering portion 11 is used for being connected to an external power supply mechanism, an output end of the first filtering portion 11 is connected to an input end of the first rectifying portion 12, an output end of the first rectifying portion 12 is connected to an input end of the second filtering portion 13, an output end of the second filtering portion 13 is connected to the upper conducting portion 16, and an output end of the output sensing portion 15 is connected to an input end of the output unit 2 and a power supply end of the control unit 4, respectively; the first conducting part 14 is connected to the output end of the control unit 4 and the second filtering part 13, and the upper conducting part 16 and the lower conducting part 17 are also connected to the input end of the output sensing part 15.
In the present embodiment, the first filter section 11 includes a first exciting coil LF1 and a second exciting coil LF2; the first rectifying unit 12 includes a first rectifying bridge BD1, a first inductance L1, and a first capacitance C1; the second filtering part 13 includes a second inductor L2, a first diode D1, a second diode D2, and a twelfth capacitor C12; the output sensing part 15 includes a primary side of the transformer T1 and a third inductance L3; the first conducting part 14 includes a thirty-first diode D31, an eighty-sixth resistor R86, an eighty-seventh resistor R87, an eighty-eighth resistor R88, an eighty-fourth resistor R84, a tenth fet Q10, and a seventeenth capacitor C17; the upper conducting part 16 comprises a fourth resistor R4, a fourth diode D4 and a second field effect transistor Q2; the lower conduction part 17 comprises a ninth resistor R9, a ninth diode D9 and a third field effect transistor Q3; one end of the first exciting coil LF1 is used for being connected with an external power supply mechanism, the external power supply mechanism can be a mains supply, the other end of the first exciting coil LF1 is connected with one end of the second exciting coil LF2, the other end of the second exciting coil LF2 is connected with a pin 2 and a pin 4 of the first rectifier bridge BD1, and the other end of the second exciting coil LF2 is also connected with the positive electrode of the thirteenth diode D13 and the positive electrode of the fourteenth diode D14 respectively; the pin 3 of the first rectifier bridge BD1 is connected to one end of the first inductor L1 and one end of the first capacitor C1, the other end of the first inductor L1 is respectively connected to the pin 1 of the second inductor L2, the pin 3 of the first control chip U1, the positive electrode of the first diode D1 and one end of the twelfth capacitor C12, the pin 6 of the second inductor L2 is connected to the positive electrode of the second diode D2, the pin 5 of the second inductor L2 is connected to the pin 5 of the first control chip U1, the negative electrode of the first diode D1, the negative electrode of the second diode D2 and the other end of the twelfth capacitor C12 are respectively connected to the drain electrode of the second field effect transistor Q2, the source electrode of the second field effect transistor Q2 and the drain electrode of the third field effect transistor Q3 are respectively connected to the pin 3 on the primary side of the transformer T1 through the third inductor L3, and the pins T1 on the primary side of the transformer T1 and the first pins 14 and the primary side of the transformer T2 are connected to the first pins 15; the grid electrode of the second field effect transistor Q2 is respectively connected with the other end of the fourth resistor R4 and the positive electrode of the fourth diode D4, and one end of the fourth resistor R4 and the negative electrode of the fourth diode D4 are respectively connected with the pin 9 of the second control chip U2; the grid electrode of the third field effect transistor Q3 is respectively connected with the other end of the ninth resistor R9 and the positive electrode of the ninth diode D9, and one end of the ninth resistor R9 and the negative electrode of the ninth diode D9 are respectively connected with the pin 6 of the second control chip U2; the negative electrode of the thirty-first diode D31 and one end of the eighty-seventh resistor R87 are respectively connected with the pin 7 of the first control chip U1, one end of the eighty-fourth resistor R84 is connected with the pin 4 of the first control chip U1, the positive electrode of the thirty-second diode D31 is connected with one end of the eighty-sixth resistor R86, the other end of the eighty-fourth resistor R84 is connected with the other end of the eighty-eighth resistor R88, the other end of the eighty-sixth resistor R86, the other end of the eighty-seventh resistor R87 and one end of the eighty-eighth resistor R88 are respectively connected with the gate of the tenth field effect transistor Q10, and the drain electrode of the tenth field effect transistor Q10 and one end of the seventeenth capacitor C17 are respectively connected with the pin 6 of the second inductor L2; the pin 2 of the first rectifier bridge BD1, the other end of the first capacitor C1, the pin 3 of the second inductor L2, the source of the tenth fet Q10, the other end of the seventeenth capacitor C17, and the source of the third fet Q3 are respectively grounded.
Further, referring to fig. 1 and 2, the input unit 1 further includes a detecting unit 18, an input end of the detecting unit 18 is connected to the first filtering unit 11, and an output end of the detecting unit 18 is connected to an input end of the signal processing unit 3.
Further, referring to fig. 1 and 3, the control unit 4 includes a boost portion 41 and a control portion 42, where a boost end of the boost portion 41 is connected to a power supply end of the second filtering portion 13, a power supply end of the boost portion 41 is connected to an input end of the control portion 42, an output end of the boost portion 41 is connected to a control end of the first conducting portion 14, a digital signal end of the control portion 42 is connected to an output end of the signal processing unit 3, and an output end of the control portion 42 is connected to a control end of the upper conducting portion 16 and a control end of the lower conducting portion 17, respectively; the power supply end of the control unit 42 is connected to the output end of the output sensing unit 15, the power supply end of the signal processing unit 3, and the power supply end of the switch driving unit 5, respectively.
In this embodiment, referring to fig. 3, the boost portion 41 includes a first control chip U1, and the control portion 42 includes a second control chip U2, a receiving end of the second optocoupler PC2, a secondary side of the transformer T1, a forty-second diode D42, and a fifteenth diode D15; the pin 2 of the first control chip U1 is connected with the pin 13 of the second control chip U2, and the pin 1 of the first control chip U1 is connected with the cathode of the first diode D1 and the other end of the twelfth capacitor C12; the pin 3 of the first control chip U1 is connected with one end of the first inductor L1; the pin 11 of the second control chip U2 is connected to the gate of the second field effect transistor Q2D, and the pin 8 of the second control chip U2 is connected to the negative electrode of the first diode D1 and the other end of the twelfth capacitor C12; the pin 2 of the second control chip U2 is connected with the receiving end of the second optocoupler PC2, and the receiving end of the second optocoupler PC2 is inductively connected with the transmitting end of the second optocoupler PC2 of the feedback portion 24; the pin 1 on the secondary side of the transformer T1 is respectively connected with the positive electrode of the fifteenth diode D15, the positive electrode of the forty-second diode D42, the pin 3 of the second control chip U2 and the receiving end of the second optocoupler PC 2; the negative electrode of the fifteenth diode D15 is connected with the transmitting end of the first optocoupler PC1 included in the switch driving unit 5 and the pin 5 of the third control chip U3 included in the voltage reducing portion, respectively; the negative electrode of the forty-two diode D42 is connected to the pin 1 of the second control chip U2.
In this embodiment, the model number of the first control chip U1 is XP3323, which is a boost controller; the model of the second control chip U2 is XP6200, is an LLC resonant controller, has the characteristics of multimode and current type full digital control, realizes optimal response speed and global efficiency, can support primary feedback, and is completely synchronous with PFC; the first control chip U1 drives the second control chip U2 to work through a high-voltage half-bridge, so that high-power work can be realized; the control unit 4 is based on the LLC architecture, with the following advantages: 1. the non-transformer stores/discharges energy, but is based on LCR oscillation, and is simple and direct; 2. the transformer does not store energy and only transforms the voltage, so that the iron loss of the inductive element is reduced; 3. the RMS current of the MOS/rectifying tube is far smaller than that of flyback under the same power, so that the ripple copper loss of each path is reduced; 4. the primary side ZVS and the secondary side ZCS can be realized through control, and the loss of the power element is reduced.
Further, referring to fig. 1 and 4, the output unit 2 includes a second rectifying portion 21, a third filtering portion 22, and a voltage stabilizing portion 23, where an input end of the second rectifying portion 21 is connected to an output end of the input unit 1, an output end of the second rectifying portion 21 is connected to an input end of the third filtering portion 22, an output end of the third filtering portion 22 is used for connecting a lighting device, an input end of the voltage stabilizing portion 23 is connected to an output end of the switch driving unit 5, and an output end of the voltage stabilizing portion 23 is connected to the third filtering portion 22.
In this embodiment, referring to fig. 4, the second rectifying portion 21 includes a third secondary side of the transformer T1 and a fourth secondary side of the transformer T1, a fifth diode D5, a sixth diode D6, a tenth diode D10 and an eleventh diode D11, the third filtering portion 22 includes a second filtering capacitor CE2, a third filtering capacitor CE3 and a third exciting coil LF3, and the voltage stabilizing portion 23 includes a fourth field effect transistor Q4, a fifth capacitor C5, a twelfth resistor R12 and a fourteenth resistor R14; the third side of the transformer T1 and the fourth side of the transformer T1 are respectively connected with the first side of the transformer T1 in an induction way; a pin 2 on the tertiary side of the transformer T1 is connected to the positive electrode of the fifth diode D5 and the positive electrode of the sixth diode D6, a pin 3 on the quaternary side of the transformer T1 is connected to the positive electrode of the tenth diode D10 and the positive electrode of the eleventh diode D11, and the negative electrode of the fifth diode D5, the negative electrode of the sixth diode D6, the negative electrode of the tenth diode D10 and the negative electrode of the eleventh diode D11 are connected to the positive electrode of the second filter capacitor EC2, the positive electrode of the third filter capacitor EC3 and one end of the third exciting coil LF3, respectively; the grid electrode of the fourth field effect transistor Q4 is connected with the pin 3 of the fifth control chip U5 included in the switch driving unit 5 through the fourteenth resistor R14, the source electrode of the fourth field effect transistor Q4 is connected with one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected with one end of the twelfth resistor R12, the other end of the twelfth resistor R12 and the drain electrode of the fourth field effect transistor Q4 are respectively connected with one end of the third exciting coil LF3, and the other end of the third exciting coil LF3 is used for being connected with a lighting device; the positive electrode of the second filter capacitor EC2 is further connected to the input end of the feedback portion 24; the pin 5 on the third side of the transformer T1, the pin 4 on the fourth side of the transformer T1, the negative electrode of the second filter capacitor EC2, and the negative electrode of the third filter capacitor EC3 are grounded respectively.
In this embodiment, the second rectifying portion 21 includes two windings, the two windings alternately output an electrical signal, after being rectified by four diodes, and then filtered by the third filtering portion 22, and then output a stable power supply voltage to an external lighting device, which may be an LED lamp, through the second plug connector CON 2; the fifth diode D5, the sixth diode D6, the tenth diode D10, and the eleventh diode D11 are diodes that integrate two diodes connected in parallel.
Further, referring to fig. 1 and 4, the output unit 2 further includes a feedback portion 24, an input end of the feedback portion 24 is connected to the third filtering portion 22, and an output end of the feedback portion 24 is connected to an input end of the control unit 4; the feedback unit 24 is a reference circuit, and the feedback unit 24 feeds back the output voltage to the second control chip U2 to adjust the working state of the input unit 1, so as to ensure that the output voltage is stable.
In this embodiment, referring to fig. 4, the feedback portion 24 includes a transmitting end of the second optocoupler PC2, a sixth voltage stabilizing tube U6, a twenty-fourth resistor R24, and a thirty-fourth resistor R30, wherein a positive electrode of the transmitting end of the second optocoupler PC2 and one end of the twenty-fourth resistor R24 are respectively connected with a positive electrode of the second filter capacitor EC2, a negative electrode of the transmitting end of the second optocoupler PC2 is connected with the pin 1 of the sixth voltage stabilizing tube U6, the pin 3 of the sixth voltage stabilizing tube U6 is respectively connected with the other end of the twenty-fourth resistor R24 and one end of the thirty-fourth resistor R30, and the other ends of the pin 2 of the sixth voltage stabilizing tube U6 and the thirty-fourth resistor R30 are respectively grounded.
Further, referring to fig. 1 and 6, the switch driving unit 5 includes a first step-down unit 51, a signal amplifying unit 52, and an isolation unit 53, where an input end of the first step-down unit 51 is connected to the third filtering unit 22, an output end of the first step-down unit 51 is connected to a power supply end of the signal amplifying unit 52 and a power supply end of the isolation unit 53, an input end of the isolation unit 53 is connected to an output end of the signal processing unit 3, an output end of the isolation unit 53 is connected to an input end of the signal amplifying unit 52, and an output end of the signal amplifying unit 52 is connected to an input end of the voltage stabilizing unit 23.
In this embodiment, referring to fig. 6, the first step-down portion 51 includes a ninth triode Q9 and a third regulator ZD3, the signal amplifying portion 52 includes a fifth control chip U5, and the isolation portion 53 includes a first optocoupler PC1 and a first triode Q1; the collector and the base of the ninth triode Q9 and the negative electrode of the third voltage stabilizing tube ZD3 are respectively connected with the positive electrode of the second filter capacitor EC2 included in the output unit 2, and the emitter of the ninth triode Q9 is connected with the pin 1 of the fifth control chip U5 for providing 12V working voltage; the pin 3 of the fifth control chip U5 is an output pin, and is configured to be connected to the gate of the fourth field effect transistor Q4 included in the voltage stabilizing portion 23; the positive electrode of the transmitting end of the first optocoupler PC1 is connected with the negative electrode of a fifteenth diode D15 included in the control unit 4, the negative electrode of the transmitting end of the first optocoupler PC1 is connected with the collector electrode of the first triode Q1, and the base electrode of the first triode Q1 is connected with the pin 14 of the constant voltage DALI platelet included in the model processing part; the transmitting end of the first optocoupler PC1 is inductively connected with the receiving end of the first optocoupler PC1, the power supply end of the receiving end of the first optocoupler PC1 is connected with the emitter of the ninth triode Q9, and the output end of the receiving end of the first optocoupler PC1 is connected with the pin 5 of the fifth control chip U5; the positive electrode of the third voltage regulator ZD3 and the emitter of the first triode Q1 are respectively grounded.
In this embodiment, the model number of the fifth control chip U5 is N531, where N531 is a universal power switch control, which can replace a push-pull circuit composed of discrete elements, and can directly drive power switches such as IGBTs, power MOSFETs, relays, and the like; the constant voltage DALI board U4 generates a PWM signal according to the received dimming signal, performs optocoupler isolation through the isolation part 53, and outputs the PWM signal to the signal amplifying part 52, so as to amplify the signal, drive and adjust the switching state of the fourth fet Q4, and perform high-frequency switching on the input voltage through the first fet Q4, and then perform filtering through the third filtering part 22, thereby obtaining a stable dc voltage.
Further, referring to fig. 1 and 5, the signal processing unit 3 includes a second voltage reducing portion 31 and a signal processing portion 32, an input end of the second voltage reducing portion 31 is connected to a power supply end of the control unit 4, and an output end of the second voltage reducing portion 31 is connected to the power supply end of the signal processing portion 32; the input end of the signal processing part 32 is used for receiving DALI dimming signals, and the output end of the signal processing part 32 is respectively connected with the input end of the switch driving unit 5 and the digital signal end of the control unit 4.
In this embodiment, referring to fig. 5, the second voltage reducing portion 31 includes a third control chip U3 and a twenty-first diode D21, the anode of the twenty-first diode D21 is connected to the cathode of a fifteenth diode D15 included in the control portion 42, the pin 5 and the pin 4 of the third control chip U3 are respectively connected to the cathode of the twenty-first diode D21, and the pin 6 of the third control chip U3 is connected to the pin 5 of the constant voltage DALI panel U4 for providing a 3.3V dc operation voltage; the model of the third control chip U3 is 62845B.
In this embodiment, referring to fig. 5, the signal processing portion 32 includes a constant voltage DALI board U4, where a pin 1 and a pin 2 of the constant voltage DALI board U4 are used for receiving DALI dimming signals, a pin 3 of the constant voltage DALI board U4 is used for receiving detection signals fed back by the detection portion 18, and a pin 7 and a pin 8 of the constant voltage DALI board U4 are respectively connected with a pin 2 and a pin 5 of the second control chip U2, so as to implement bidirectional transmission of digital signals; the pin 14 of the constant voltage DALI small plate U4 is connected with the base electrode of the first triode Q1, and outputs a PWM signal to the signal amplifying section 52 for further amplification, so as to realize the adjustment of the working state of the voltage stabilizing section 23; further, the pin 7 of the constant voltage DALI small plate U4 is an RX pin, the RX pin receives 3.3V or 5V logic input and has a burr shielding function of 280nS, so that the influence of interference signals can be effectively eliminated; and a pin 8 of the constant-voltage DALI small plate U4 is a TX pin, the TX pin can send 3.3V logic or select open drain output, and digital signals can be input and output through the cooperation of the RX pin and the TX pin.
In this embodiment, the constant-voltage DALI board U4 is a prior art, and may include a demodulation chip with a model CS32F031K8U6, an interface chip with a model BP5016, and a linear constant-current chip with a model BP5113JA, where after receiving a DALI dimming signal through the interface chip, the demodulation chip outputs a digital signal to the upper conducting portion 16 and the lower conducting portion 17 or outputs a PWM signal to the isolating portion 53 after demodulating the received signal, and the linear constant-current chip is used to provide a stable working voltage for the optocoupler work and the interface chip work.
The invention also correspondingly provides a PCB board on which the high-power digital dimming circuit is printed.
The invention also correspondingly provides a driving power supply which adopts the high-power digital dimming circuit to realize the work control.
It will be understood that equivalents and modifications will occur to those skilled in the art based on the present invention and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention.
Claims (10)
1. The high-power digital dimming circuit is characterized by comprising an input unit, an output unit, a signal processing unit, a control unit and a switch driving unit, wherein the input unit comprises an upper conducting part and a lower conducting part, the input end of the input unit is used for being connected with an external power supply mechanism, the output end and the power supply end of the input unit are respectively and correspondingly connected with the input end of the output unit and the boosting end of the control unit, the input end of the signal processing unit is used for receiving DALI dimming signals, the output end of the signal processing unit is respectively connected with the digital signal end of the control unit and the input end of the switch driving unit, and the output end of the control unit is respectively connected with the control end of the upper conducting part and the control end of the lower conducting part; the output end of the switch driving unit is connected with the output unit, and the output end of the output unit is used for being connected with the lighting device.
2. The high-power digital dimming circuit according to claim 1, wherein the input unit further comprises a first filtering part, a first rectifying part, a second filtering part, a first conducting part and an output sensing part, the input end of the first filtering part is used for being connected with an external power supply mechanism, the output end of the first filtering part is connected with the input end of the first rectifying part, the output end of the first rectifying part is connected with the input end of the second filtering part, the output end of the second filtering part is connected with the upper conducting part, and the output end of the output sensing part is respectively connected with the input end of the output unit and the power supply end of the control unit; the first conducting part is respectively connected with the output end of the control unit and the second filtering part, and the upper conducting part and the lower conducting part are respectively connected with the input end of the output sensing part.
3. The high-power digital dimming circuit as claimed in claim 2, wherein the input unit further comprises a detection portion, an input end of the detection portion is connected to the first filtering portion, and an output end of the detection portion is connected to an input end of the signal processing unit.
4. The high-power digital dimming circuit according to claim 2, wherein the control unit comprises a boost part and a control part, the boost end of the boost part is connected with the power supply end of the second filtering part, the power supply end of the boost part is connected with the input end of the control part, the output end of the boost part is connected with the control end of the first conducting part, the digital signal end of the control part is connected with the output end of the signal processing unit, and the output end of the control part is connected with the control end of the upper conducting part and the control end of the lower conducting part respectively; the power supply end of the control part is respectively connected with the output end of the output induction part, the power supply end of the signal processing unit and the power supply end of the switch driving unit.
5. The high-power digital dimming circuit according to claim 1, wherein the output unit comprises a second rectifying portion, a third filtering portion and a voltage stabilizing portion, an input end of the second rectifying portion is connected with an output end of the input unit, an output end of the second rectifying portion is connected with an input end of the third filtering portion, an output end of the third filtering portion is used for being connected with a lighting device, an input end of the voltage stabilizing portion is connected with an output end of the switch driving unit, and an output end of the voltage stabilizing portion is connected with the third filtering portion.
6. The high-power digital dimming circuit as claimed in claim 5, wherein the output unit further comprises a feedback portion, an input end of the feedback portion is connected to the third filtering portion, and an output end of the feedback portion is connected to an input end of the control unit.
7. The high-power digital dimming circuit according to claim 5, wherein the switch driving unit comprises a first voltage reducing part, a signal amplifying part and an isolating part, the input end of the first voltage reducing part is connected with the third filtering part, the output end of the first voltage reducing part is respectively connected with the power supply end of the signal amplifying part and the power supply end of the isolating part, the input end of the isolating part is connected with the output end of the signal processing unit, the output end of the isolating part is connected with the input end of the signal amplifying part, and the output end of the signal amplifying part is connected with the input end of the voltage stabilizing part.
8. The high-power digital dimming circuit as claimed in claim 1, wherein the signal processing unit comprises a second voltage reducing part and a signal processing part, an input end of the second voltage reducing part is connected with a power supply end of the control unit, and an output end of the second voltage reducing part is connected with the power supply end of the signal processing part; the input end of the signal processing part is used for receiving the DALI dimming signal, and the output end of the signal processing part is respectively connected with the input end of the switch driving unit and the digital signal end of the control unit.
9. A PCB board on which the high power digital dimming circuit of any of claims 1 to 8 is printed.
10. A driving power supply, characterized in that the driving power supply adopts the high-power digital dimming circuit as claimed in any one of claims 1-8 to realize operation control.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410115474.4A CN117939739A (en) | 2024-01-26 | 2024-01-26 | High-power digital dimming circuit, PCB and driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410115474.4A CN117939739A (en) | 2024-01-26 | 2024-01-26 | High-power digital dimming circuit, PCB and driving power supply |
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| CN117939739A true CN117939739A (en) | 2024-04-26 |
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| CN202410115474.4A Pending CN117939739A (en) | 2024-01-26 | 2024-01-26 | High-power digital dimming circuit, PCB and driving power supply |
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