CN116321583A

CN116321583A - DALI constant voltage power supply containing D4i function

Info

Publication number: CN116321583A
Application number: CN202310274022.6A
Authority: CN
Inventors: 陈耿圳
Original assignee: Zhuhai Shengchang Electronics Co ltd
Current assignee: Zhuhai Shengchang Electronics Co ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-06-23
Anticipated expiration: 2043-03-21
Also published as: CN116321583B

Abstract

The invention provides a DALI constant voltage power supply with a D4i function, wherein a first loop current detection circuit is respectively connected with a zero line, a front-stage sampling circuit, a power module and a power circuit of mains supply; the power supply circuit is also respectively connected with a live wire of the mains supply, a second loop current detection circuit, a post-stage sampling and detection circuit and a voltage positive terminal; the second loop current detection circuit is also connected with the control circuit and the later stage sampling and detection circuit; the control circuit is respectively connected with the MCU, the later stage sampling and detecting circuit and the control negative terminal; the post-stage sampling and detecting circuit is respectively connected with the MCU and the voltage positive terminal; the MCU is respectively connected with the temperature detection circuit, the DALI communication circuit and the front-stage sampling circuit; the power supply module is also respectively connected with a live wire of the mains supply, a front-stage sampling circuit and a bus power supply; the bus power supply is also respectively connected with the DALI communication circuit and the DALI system. The invention can have the functions of integrating bus power supply, memory strip expansion, energy consumption report, external auxiliary power supply, diagnosis and maintenance, and the like.

Description

DALI constant voltage power supply containing D4i function

Technical Field

The invention relates to the technical field of LED dimming power supplies, in particular to a DALI constant voltage power supply with a D4i function.

Background

With the rapid development of the LED illumination industry, the LED is installed in various households and outdoor illumination, so that the LED power supply market is vigorously developed, the requirements on the LED power supply are higher and higher, the LED power supply is not used for dimming, and the system is matched for realizing large-scale LED power supply control and dimming. The DALI intelligent lighting control system has the advantages of strong anti-interference performance, fault information feedback, standard protocol, special authentication and the like, and is favored by the market.

In recent years, with the continuous development of intelligent lighting technology of DALI, DALI is upgraded to D4i, and D4i has functions of integrated bus power supply, storage bar expansion, energy consumption report, external auxiliary power supply, diagnosis and maintenance, etc. Most of the manufacturers' products do not fully have the function of D4i, so it is necessary to develop a DALI constant voltage power supply scheme including the function of D4 i.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a DALI constant voltage power supply with a D4i function.

In order to achieve the above object, the present invention provides the following solutions:

a DALI constant voltage power supply comprising D4i functionality, comprising: the system comprises a power supply circuit, a first loop current detection circuit, a second loop current detection circuit, a control circuit, a temperature detection circuit, a front-stage sampling circuit, an MCU, a rear-stage sampling and detection circuit, a power supply module, a bus power supply, a DALI communication circuit and a DALI system;

the first loop current detection circuit is respectively connected with a zero line of mains supply, the front-stage sampling circuit, the power supply module and the power supply circuit; the power supply circuit is also respectively connected with a live wire of the mains supply, the second loop current detection circuit, the post-stage sampling and detection circuit and a voltage positive terminal; the second loop current detection circuit is also connected with the control circuit and the post-stage sampling and detection circuit; the control circuit is respectively connected with the MCU, the later stage sampling and detecting circuit and the control negative terminal; the post-stage sampling and detecting circuit is respectively connected with the MCU and the voltage positive terminal; the MCU is respectively connected with the temperature detection circuit, the DALI communication circuit and the pre-stage sampling circuit; the power supply module is also respectively connected with a live wire of the commercial power, the front-stage sampling circuit and the bus power supply; the bus power supply is also respectively connected with the DALI communication circuit and the DALI system.

Preferably, the first loop current detection circuit includes a first resistor;

one end of the first resistor is connected with the zero line of the mains supply and the power supply module respectively; the other end of the first resistor is connected with the power supply circuit and the front-stage sampling circuit respectively.

Preferably, the second loop current detection circuit includes a second resistor;

one end of the second resistor is connected with the power supply circuit; the other end of the second resistor is connected with the control circuit and the later stage sampling and detecting circuit respectively.

Preferably, the post-stage sampling and detecting circuit includes: a third resistor, a sixth resistor, an operational amplifier, a fourth resistor, a fifth resistor, a seventh resistor, an eleventh resistor, a twelfth resistor, a fifteenth resistor, a seventeenth resistor, a twentieth resistor, a third capacitor and a second triode;

the first pin of the operational amplifier is connected with the second loop current detection circuit; a first leg of the operational amplifier; the second pin of the operational amplifier is connected with a ground wire; the third pin of the operational amplifier is respectively connected with one end of a third resistor and one end of a sixth resistor; the fourth pin of the operational amplifier is connected with the other end of the sixth resistor; the fifth pin of the operational amplifier is connected with a power supply voltage;

one end of the fourth resistor is connected with the voltage positive terminal and the emitter of the second triode respectively; the other end of the fourth resistor is connected with one end of the fifth resistor and the MCU respectively; the other end of the fifth resistor is connected with a ground wire; the collector electrode of the second triode is connected with one end of the twelfth resistor; the other end of the twelfth resistor is connected with one end of the MCU and one end of the seventeenth resistor respectively; the other end of the seventeenth resistor is connected with a ground wire; the base electrode of the second triode is connected with one end of the seventh resistor; the other end of the seventh resistor is connected with one end of the fifteenth resistor, one end of the eleventh resistor, the control negative terminal and the control circuit respectively; the other end of the eleventh resistor is connected with a ground wire; the other end of the fifteenth resistor is connected with the MCU, one end of the third capacitor and one end of the twentieth resistor respectively; and the other end of the third capacitor is respectively connected with the other end of the twentieth resistor and the ground wire.

Preferably, the control circuit includes: the first NMOS transistor, the thirty-fifth resistor and the thirty-sixth resistor;

the source electrode of the first NMOS tube is respectively connected with the second loop current detection circuit and one end of the thirty-sixth resistor; the drain electrode of the first NMOS tube is respectively connected with the control negative terminal and the post-stage sampling and detecting circuit; the grid electrode of the first NMOS tube is respectively connected with the other end of the thirty-sixth resistor and one end of the thirty-fifth resistor; the other end of the thirty-fifth resistor is connected with the later stage sampling and detecting circuit.

Preferably, the temperature detection circuit includes: a twenty-fourth resistor, a twenty-fifth resistor, a first thermistor, and a second thermistor;

one end of the twenty-fourth resistor and one end of the twenty-fifth resistor are respectively connected with a power supply voltage; the other end of the twenty-fourth resistor is connected with the first thermistor and the MCU respectively; the other end of the twenty-fifth resistor is connected with the second thermistor and the MCU respectively; the other end of the first thermistor and the other end of the second thermistor are respectively connected with a ground wire.

Preferably, the pre-stage sampling circuit includes:

eighth resistor, ninth resistor, tenth resistor, thirteenth resistor, fourteenth resistor, sixteenth resistor, nineteenth resistor, thirteenth resistor, fourteenth resistor, eighteenth resistor, twenty-first resistor, twenty-second resistor, twenty-third resistor, first capacitor, second capacitor, fourth capacitor, fifth capacitor, second photo coupler, fourth photo coupler, and electric energy metering IC;

one end of the tenth resistor is connected with the live wire of the mains supply; the other end of the tenth resistor is connected with one end of the sixteenth resistor, the other end of the sixteenth resistor is connected with one end of the nineteenth resistor, the other end of the nineteenth resistor is connected with one end of the twenty first resistor, and the other end of the twenty first resistor is respectively connected with one end of the twenty third resistor, one end of the fourth capacitor and a third pin of the electric energy metering IC; the other end of the twenty-third resistor is respectively connected with the fourth capacitor, the fourth pin of the electric energy metering IC and the ground wire; one end of the eighth resistor is connected with the first loop current detection circuit; the other end of the eighth resistor is respectively connected with one end of the first capacitor and a second pin of the electric energy metering IC; one end of the ninth resistor is connected with the first loop current detection circuit, the other end of the first capacitor, one end of the second capacitor and the ground wire respectively; the other end of the ninth capacitor is connected with the other end of the second capacitor and the first pin of the electric energy metering IC respectively; one end of the thirteenth capacitor is connected with the output voltage and an eighth pin of the electric energy metering IC respectively; the other end of the thirteenth capacitor is respectively connected with a seventh pin of the electric energy metering IC and a fourth pin of the second photoelectric coupler; the third pin of the second photoelectric coupler is connected with a ground wire; the first pin of the second photoelectric coupler is connected with one end of the fourteenth resistor; the other end of the fourteenth resistor is connected with the MCU; the second pin of the second photoelectric coupler is connected with the third pin of the fourth photoelectric coupler and the ground wire respectively; one end of the eighteenth resistor is connected with the power supply voltage, and the other end of the eighteenth resistor is connected with a fourth pin of the fourth photoelectric coupler and the MCU respectively; the first pin of the fourth photoelectric coupler is connected with one end of the twenty-second resistor, the other end of the twenty-second resistor is connected with the sixth pin of the electric energy metering IC, the fifth pin of the electric energy metering IC is connected with one end of the fifth capacitor, and the other end of the fifth capacitor is connected with the ground wire and the second pin of the fourth photoelectric coupler respectively.

Preferably, the bus power supply includes: a third NMOS tube, a thirty-second resistor, a seventh capacitor, a twenty-eighth resistor, a first diode, a thirty-second resistor, a voltage reference IC and a first voltage stabilizing tube;

one end of the thirty-second resistor is connected with the power supply module and the drain electrode of the third NMOS tube respectively; the other end of the thirty-second resistor is respectively connected with the grid electrode of the third NMOS tube, one end of the thirty-second resistor, one end of the seventh capacitor, the second pin of the voltage reference IC and one end of the voltage stabilizing tube; the other end of the seventh capacitor is respectively connected with the power module, the DALI system and the DALI communication circuit; the other end of the thirty-first resistor is connected with the source electrode of the third NMOS tube, the other end of the voltage stabilizing tube, the first pin of the voltage reference IC and one end of the twenty-eighth resistor respectively; the other end of the twenty-eighth resistor is respectively connected with one end of the first diode and the third pin of the voltage reference IC; the other end of the first diode is respectively connected with the DALI system and the DALI communication circuit.

Preferably, the DALI communication circuit comprises: the device comprises a rectifier bridge, a fifth NMOS tube, a fourth triode, an eighth capacitor, a twenty-ninth resistor, a thirty-third resistor, a thirty-fourth resistor, a ninth capacitor, a second voltage stabilizing tube, a fifth photoelectric coupler, a sixth photoelectric coupler, a twenty-seventh resistor and a thirty-first resistor;

the second pin of the rectifier bridge is respectively connected with the bus power supply and the power supply module; the fourth pin of the rectifier bridge is respectively connected with the DALI system and the bus power supply; the first pin of the rectifier bridge is respectively connected with the drain electrode of the fifth NMOS tube and the emitter electrode of the fourth triode; the third leg of the rectifier bridge is respectively connected with the source electrode of the fifth NMOS tube, one end of the eighth capacitor, one end of the thirty-fourth resistor, one end of the twenty-ninth resistor, one end of the ninth capacitor and one end of the second voltage stabilizing tube; the grid electrode of the fifth NMOS tube is respectively connected with the other end of the eighth capacitor, the other end of the thirty-fourth resistor and one end of the thirty-third resistor; the other end of the thirty-third resistor is connected with a third pin of the fifth photoelectric coupler; the base electrode of the fourth triode is connected with the other end of the twenty-ninth resistor; the collector electrode of the fourth triode is connected with the first pin of the sixth photoelectric coupler; the fourth pin of the fifth photoelectric coupler is respectively connected with the other end of the ninth capacitor, the second end of the second voltage stabilizing tube and the second pin of the sixth photoelectric coupler; the first pin of the fifth photoelectric coupler is connected with one end of the twenty-seventh resistor; the other end of the twenty-seventh resistor is connected with the MCU; the second pin of the fifth photoelectric coupler is connected with the third pin of the sixth photoelectric coupler and the ground wire respectively; the fourth pin of the sixth photoelectric coupler is connected with one end of the MCU and one end of the thirty-first resistor respectively; the other end of the thirty-first resistor is connected with a power supply voltage.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the invention provides a DALI constant voltage power supply comprising a D4i function, which comprises the following components: the system comprises a power supply circuit, a first loop current detection circuit, a second loop current detection circuit, a control circuit, a temperature detection circuit, a front-stage sampling circuit, an MCU, a rear-stage sampling and detection circuit, a power supply module, a bus power supply, a DALI communication circuit and a DALI system; the first loop current detection circuit is respectively connected with a zero line of mains supply, the front-stage sampling circuit, the power supply module and the power supply circuit; the power supply circuit is also respectively connected with a live wire of the mains supply, the second loop current detection circuit, the post-stage sampling and detection circuit and a voltage positive terminal; the second loop current detection circuit is also connected with the control circuit and the post-stage sampling and detection circuit; the control circuit is respectively connected with the MCU, the later stage sampling and detecting circuit and the control negative terminal; the post-stage sampling and detecting circuit is respectively connected with the MCU and the voltage positive terminal; the MCU is respectively connected with the temperature detection circuit, the DALI communication circuit and the pre-stage sampling circuit; the power supply module is also respectively connected with a live wire of the commercial power, the front-stage sampling circuit and the bus power supply; the bus power supply is also respectively connected with the DALI communication circuit and the DALI system. The invention can have the functions of integrating bus power supply, memory strip expansion, energy consumption report, external auxiliary power supply, diagnosis and maintenance, and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a power supply according to an embodiment of the present invention;

fig. 2 is a circuit configuration diagram provided in an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The terms "first," "second," "third," and "fourth" and the like in the description and in the claims of this application and in the drawings, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, inclusion of a list of steps, processes, methods, etc. is not limited to the listed steps but may alternatively include steps not listed or may alternatively include other steps inherent to such processes, methods, products, or apparatus.

The invention aims to provide a DALI constant voltage power supply with a D4i function, which has the functions of integrated bus power supply, storage bar expansion, energy consumption report, external auxiliary power supply, diagnosis, maintenance and the like.

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Fig. 1 is a schematic diagram of a power supply structure provided in an embodiment of the present invention, and as shown in fig. 1, the present invention provides a DALI constant voltage power supply including a D4i function, which is characterized in that the power supply structure includes: a power supply circuit, a first loop current detection circuit 101, a second loop current detection circuit 110, a control circuit 111, a temperature detection circuit 109, a pre-stage sampling circuit 102, an MCU108, a post-stage sampling and detection circuit 106, a power supply module 103, a bus power supply 104, a DALI communication circuit 107, and a DALI system 105;

the first loop current detection circuit 101 is respectively connected with a zero line of mains supply, the front-stage sampling circuit 102, the power module 103 and a power circuit; the power supply circuit is also respectively connected with a live wire of the commercial power, the second loop current detection circuit 110, the post-stage sampling and detection circuit 106 and a voltage positive terminal; the second loop current detection circuit 110 is further connected to the control circuit 111 and the post-sampling and detection circuit 106; the control circuit 111 is connected to the MCU108, the post-sampling and detection circuit 106, and the control negative terminal, respectively; the post-stage sampling and detecting circuit 106 is connected with the MCU108 and the voltage positive terminal respectively; the MCU108 is respectively connected with the temperature detection circuit 109, the DALI communication circuit 107 and the pre-sampling circuit 102; the power module 103 is also respectively connected with a live wire of the commercial power, the front-stage sampling circuit 102 and the bus power supply 104; the bus power supply 104 is also connected to the DALI communication circuit 107 and the DALI system 105, respectively.

As shown in fig. 2, the circuit in this embodiment operates as follows:

when the system is electrified, a live wire L and a zero wire N of the commercial power are connected to a power supply circuit through terminals, and the power supply circuit respectively outputs a positive voltage terminal V+ to control a negative terminal V-, a power supply voltage VCC and a ground wire GNS. While L, N is connected to the power supply module 103 via terminals to output the voltage VDD, the voltage VDC, the ground VSS and the ground GND, respectively. When the positive voltage terminal V+ and the negative control terminal V-are connected with loads, the front-stage current flows through the first resistor R1 to generate voltage drop on the first resistor R1, the voltage drop on the two ends of the first resistor R1 passes through the eighth resistor R8 and the ninth resistor R9, the first capacitor C1 and the second capacitor C2 are respectively connected to the 1 st pin and the 2 nd pin of the electric energy measurement ICU3 after being filtered, meanwhile, the L is connected to the tenth resistor R10, the sixteenth resistor R16, the nineteenth resistor R19, the twenty-first resistor R21, the twenty-third resistor R23 and the fourth capacitor C4 after being subjected to voltage division filtering, and then connected to the 4 th pin of the electric energy measurement ICU 3. After the collected data are processed by the electric energy metering ICU3, a square wave pulse signal is output by a 6 th pin of the electric energy metering ICU3, the signal is transmitted to a 20 th pin of the singlechip U1 through an eighteenth resistor R18, a twenty second resistor R22 and a fourth photoelectric coupler U4, and the singlechip U1 can obtain the mains frequency, input voltage, input current, active power, apparent power, power factors and other parameters of the power supply after decryption processing. The 7 th pin of the electric energy metering ICU3 is a register configuration function, and a 19 th pin of the singlechip U1 is required to send square wave pulse signals to be transmitted to a register related to the 7 th pin configuration of the electric energy metering ICU3 through a thirteenth resistor R13, a fourteenth resistor R14 and a second photoelectric coupler U2 after the power supply is electrified. The voltage positive terminal v+ and the current controlling the load across the negative terminal V-are connected to the second resistor R2 through the first NMOS transistor Q1, creating a voltage drop across the second resistor R2. The two ends of the second resistor R2 are respectively connected to the 1 st pin and the 3 rd pin of the seventh operational amplifier U7, and the load current can be obtained by amplifying the signal through the seventh operational amplifier U7 and then connecting the amplified signal to the 18 th pin of the singlechip U1. By setting the resistances of the third resistor R3 and the sixth resistor R6, the amplification factor of the seventh operational amplifier U7 can be determined. Meanwhile, the voltage positive terminal V+ and the control negative terminal V-are respectively connected to the 16 th pin and the 15 th pin of the singlechip U1 for processing through the voltage division and filtering through the fourth resistor R4, the fifth resistor R5, the fifteenth resistor R15, the twentieth resistor R20 and the third capacitor C3, so that the voltage at the two ends of the voltage positive terminal V+ and the control negative terminal V-can be obtained. At this time, knowing the voltage and current of the preceding and following stages, pin and Pout can be obtained by the formula p=u×i, efficiency η=pout/Pin. So far, the singlechip U1 has measured all the electric energy parameters of the power supply. The power supply can work on load or open circuit at the moment after the signals of the 15 th pin and the 18 th pin of the singlechip U1 are processed. The positive voltage terminal V+ is connected with the emitter of the second triode Q2 of PNP, the base electrode of the second triode Q2 is connected to the ground GNS through a seventh resistor R7 and an eleventh resistor R11, and the second triode Q2 is conducted. The collector output voltage of the second triode Q2 is connected to the 14 th pin of the singlechip U1 after being divided by a twelfth resistor R12 and a seventeenth resistor R17. When the output voltage positive terminal V+ and the control negative terminal V-of the power supply are in short circuit, the voltage positive terminal V+ is connected to the base electrode of the second triode Q2 through the control negative terminal V-and the seventh resistor R7, the second triode Q2 is turned on, the 14 th pin signal of the singlechip U1 is pulled down, and the singlechip U1 detects the short circuit. Meanwhile, the 17 th pin of the singlechip U1 is closed for output, so that the first NMOS tube Q1 is protected. The voltage VCC is connected to the 9 th pin of the single chip microcomputer U1 through the twenty-fourth resistor R24 and the first thermistor NTC1 in a voltage division mode, and the temperature of the power supply can be known because the first thermistor NTC1 is arranged inside the power supply. The voltage VCC is connected to the 10 th pin of the singlechip U1 through the twenty-fifth resistor R25 and the second thermistor NTC2 in a voltage division manner, and the temperature of the LED lamp can be obtained because the second thermistor NTC2 is arranged at the LED lamp. After the information collected by the singlechip is processed, the data are output into square wave pulse signals through the 7 th pin of the singlechip U1. The fifth photoelectric coupler U5 is conducted through a twenty-seventh resistor R27, the fifth photoelectric coupler U5 outputs square wave pulse signals, and the fifth NMOS tube Q5 is conducted through a thirty-third resistor R33, a thirty-fourth resistor R34 and an eighth capacitor C8. The fifth NMOS transistor Q5 pulls down the voltage across

legs

1 and 3 of the rectifier bridge DB1, connects to the DALI system 105 through

legs

2 and 4 of the rectifier bridge DB1, and transfers the data to the DALI system 105. The voltage VDC is connected to the DALI bus through the thirty-first resistor R30, the thirty-second resistor R32, the seventh capacitor C7 and the first regulator Z1 to turn on the third NMOS transistor Q3, and after the third NMOS transistor Q3 is turned on, the voltage reference ICU8 and the first diode D1 are connected to the DALI bus through the twenty-eighth resistor R28 to supply power to the DALI bus without external power to the DALI bus. The current of the DALI bus power supply can be determined by selecting the appropriate value of the twenty-eighth resistor R28. Once the set current is exceeded, the voltage reference ICU8 is turned on, pulling the driving voltage of the third NMOS transistor Q3 low, and turning off the third NMOS transistor Q3. Because of the protocol requirements of D4i, the external auxiliary power supply needs to be electrically connected to the DALI bus power supply, so that the voltage VCC and the ground GND can be used as the external auxiliary power supply to provide power for the external sensor or other devices that need power. When the DALI system 105 issues a command, a square wave pulse signal is issued through the DALI bus power supply. The square wave pulse signal is connected to the emitter of a fourth triode Q4 of PNP through a rectifier bridge DB1, the base of the fourth triode Q4 is connected to the 3 rd pin of the rectifier bridge DB1 through a twenty-ninth resistor R29, the fourth triode Q4 is conducted, the collector output voltage of the fourth triode Q4 is conducted, after being filtered through a ninth capacitor C9 and stabilized by a second voltage stabilizing tube Z2, a sixth photoelectric coupler U6 is conducted, the sixth photoelectric coupler U6 outputs the square wave pulse signal, the square wave pulse signal is connected to the 8 th pin of the singlechip U1 through a thirty-first resistor R31, and the singlechip U1 executes related operation after receiving an instruction. So far, the power supply has realized all functions of D4 i.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims

1. A DALI constant voltage power supply comprising D4i functionality, comprising: the system comprises a power supply circuit, a first loop current detection circuit, a second loop current detection circuit, a control circuit, a temperature detection circuit, a front-stage sampling circuit, an MCU, a rear-stage sampling and detection circuit, a power supply module, a bus power supply, a DALI communication circuit and a DALI system;

2. The DALI constant voltage power supply comprising a D4i function as claimed in claim 1, wherein the first loop current detection circuit comprises a first resistor;

3. The DALI constant voltage power supply comprising a D4i function as claimed in claim 1, wherein the second loop current detection circuit comprises a second resistor;

4. The DALI constant voltage power supply including D4i function as claimed in claim 1, wherein the post-sampling and detection circuit comprises: a third resistor, a sixth resistor, an operational amplifier, a fourth resistor, a fifth resistor, a seventh resistor, an eleventh resistor, a twelfth resistor, a fifteenth resistor, a seventeenth resistor, a twentieth resistor, a third capacitor and a second triode;

5. The DALI constant voltage power supply comprising D4i functions of claim 1, wherein the control circuit comprises: the first NMOS transistor, the thirty-fifth resistor and the thirty-sixth resistor;

6. The DALI constant voltage power supply comprising a D4i function as claimed in claim 1, wherein the temperature detection circuit comprises: a twenty-fourth resistor, a twenty-fifth resistor, a first thermistor, and a second thermistor;

7. The DALI constant voltage power supply including D4i function as claimed in claim 1, wherein the pre-sampling circuit comprises:

8. The DALI constant voltage power supply comprising D4i functionality of claim 1, wherein the bus power supply comprises: a third NMOS tube, a thirty-second resistor, a seventh capacitor, a twenty-eighth resistor, a first diode, a thirty-second resistor, a voltage reference IC and a first voltage stabilizing tube;

9. The DALI constant voltage power supply comprising D4i functions of claim 1, wherein the DALI communication circuit comprises: the device comprises a rectifier bridge, a fifth NMOS tube, a fourth triode, an eighth capacitor, a twenty-ninth resistor, a thirty-third resistor, a thirty-fourth resistor, a ninth capacitor, a second voltage stabilizing tube, a fifth photoelectric coupler, a sixth photoelectric coupler, a twenty-seventh resistor and a thirty-first resistor;