A DALI bus power supply

Abstract

The present invention discloses a DALI bus power supply, including a 24V constant voltage power supply conversion circuit, a DC-DC step-down circuit, an MCU control circuit, a DALI interface circuit, a power supply circuit, a current threshold feedback circuit, a MOS tube switch circuit, a relay protection circuit, an alarm circuit and a data read-write switch circuit; the output current value of the DC-DC step-down circuit is monitored by the current threshold feedback circuit, and the detection data is transmitted to the MCU control circuit, and the MCU control circuit performs a threshold judgment. If it is greater than the set threshold, the DALI bus output voltage is turned off by the MOS tube switch circuit, and protection and alarm are performed by the relay protection circuit and the alarm circuit; the data read-write switch circuit is used to burn in or change the software program of the MCU control circuit control chip. The bus power supply has a relay protection function, a local storage function, a one-key burn-in function, and an additional one-key reading function, and has the advantages of convenient replacement and good protection.

Description

Technical Field

[0001] The invention relates to the technical field of LED power supplies. Background Art

[0002] At present, DALI system technology has been promoted, but the DALI system can carry up to 64 components with independent addresses, and all of them are automatic dialing IDs. The system automatically writes and reads addresses, and the DALI system can be used alone or in multiple groups. However, when used in an integrated manner, when the DALI bus power supply fails, it needs to be better. However, after replacing the new bus power supply, the system selection address needs to be debugged to achieve control, which brings inconvenience to the user. At the same time, the current DALI system bus power supply protection measures cannot provide timely protection when a failure occurs, and the power supply is easily burned. For this reason, a DALI bus power supply with convenient operation and good protection is urgently needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a DALI bus power supply, which has a relay protection function, a local storage function, a one-key burn-in function, and an additional one-key read function, and has the advantages of convenient replacement and good protection.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a DALI bus power supply, including a 24V constant voltage power supply conversion circuit, a DC-DC step-down circuit, an MCU control circuit, a DALI interface circuit, a power supply circuit, a current threshold feedback circuit, a MOS tube switch circuit, a relay protection circuit, an alarm circuit and a data read-write switch circuit; the city power is converted into 24V direct current by the 24V constant voltage power supply conversion circuit, and then stepped down to a voltage of 15-16.5V by the DC-DC step-down circuit, and then the DALI bus voltage is output by the MOS tube switch circuit; and the output current value of the DC-DC step-down circuit is monitored by the current threshold feedback circuit, and the detection data is transmitted to the MCU control circuit, and the MCU control circuit performs threshold judgment. If it is greater than the set threshold, the DALI bus output voltage is turned off by the MOS tube switch circuit, and protection and alarm are performed by the relay protection circuit and the alarm circuit. The DALI interface circuit is used for sending and receiving DALI signals, and the DALI signals are transmitted to the MCU control circuit for data interactive control, which is used to control the DALI power supply; the data read-write switch circuit is used to burn in or change the software program of the control chip of the MCU control circuit;

[0005] The DC-DC buck circuit includes a buck chip U1, a CS pin 1 of the chip is short-circuited with a DC pin 8 and an IC pin 7, a SE pin 2 is divided into three paths, a first path is grounded via the negative electrode of a diode D1, a second path is grounded via a capacitor C7, and a third path is divided into two paths after passing through an inductor L1, one path is connected to a pin 5 of a TCS1 type current sensor of a current threshold feedback circuit, and the other path is grounded via resistors R3 and R5, a CT pin 3 is grounded via a capacitor 6, a GND pin 4 is grounded, an IN- pin 5 is connected to the junction of resistors R3 and R5, and a VCC pin is connected to the positive output terminal of a 24V constant voltage power supply conversion circuit;

[0006] The current threshold feedback circuit includes a TCS1 type current sensor, the pin 1 of which is connected to the PSA pin 9 of the MCU control circuit chip U4 via a resistor R2, the pin 2 is grounded, the pin 3 is connected to the gate of the MOS tube VT1 via a resistor R10, the pin 4 is connected to the source of the MOS tube, and the pin 5 and the pin 3 are connected in parallel and then connected to the output end of the DC-DC buck circuit;

[0007] The relay protection circuit includes a relay U5, wherein pin 1 is connected to pin 2 via the cathode of a diode D5, pin 2 is connected to the collector of a transistor VT8, the emitter of the transistor is grounded, and the base is divided into two paths via a resistor R27, one path is connected to the RLY pin 12 of the MCU control circuit chip U4, and the other path is connected to a 5V power supply via a resistor R36 and a light-emitting diode D10.

[0008] A further optimized technical solution is that the MOS tube switch circuit is composed of a MOS tube VT1, a transistor VT2, VT3, VT4, VT5, VT6 and a chip U3, the source of the MOS tube VT1 is connected to pin 3 of the TCS1 current sensor chip, the drain outputs the DALI bus voltage through a diode D2 and a resistor R9, the gate is connected to the collector of the transistor VT3, the base of the transistor VT3 is connected to the collector of the transistor VT6 through resistors R12 and R18, and the emitter of the transistor VT3 is connected to a 24V constant voltage At the positive output end of the power supply conversion circuit, the base of the transistor VT6 is connected to the PSSW pin 13 of the MCU control circuit chip U4 via the resistor R24, the emitter is grounded, the gate of the MOS tube VT1 and the collector of the transistor VT3 are short-circuited with the node of the resistor R12 and the resistor R18, and the pin 1 of the chip U3 is divided into three paths, the first path is connected to the A-DRX pin 18 of the MCU control circuit chip U4, the second path is connected to the base of the transistor VT5 via the resistor R17, and the third path is connected to the emitter of the transistor VT5 via the capacitor C11. The emitter, pin 2 is grounded, pin 3 is connected to a 5V power supply through a resistor R7, capacitor C10 and resistor R15 are connected in parallel, one end is connected to pin 3, and the other end is grounded, pin 4 is divided into three paths, the first path is connected to the BACK pin 8 of the MCU control circuit chip U4 through resistor R14 and capacitor C12, the second path is connected to the junction of the diode D2 and the resistor R9 through resistor R6, the third path is connected to the drain of the MOS tube VT1 through capacitor C9, resistor R19, and resistor R11, pin 5 is connected to a 5V power supply, and the collector of the transistor VT5 is connected to the collector of the transistor VT5. The base is connected to a 5V power supply via resistors R16 and R7, the collector of transistor VT2 is connected to the junction of resistor R6 and diode D2, the base is connected to A-DTX pin 17 of MCU control circuit chip U4 via resistor R13, the emitter is connected to the base of transistor VT4 via resistor R20, the collector of transistor VT4 is connected to A-DTX pin 17 of MCU control circuit chip U4 via resistor R13, the emitter is grounded, resistors R22 and R23 are connected in parallel, one end of which is connected to the emitter of transistor VT2, and the other end is grounded.

[0009] A further optimized technical solution is that the alarm circuit and data read-write switch circuit include a buzzer BZ1, an execution switch S1, and a read-write switch S2. Pin 2 of the buzzer BZ1 is connected to the collector of the transistor VT17. The base of the transistor VT17 is connected to the BELL pin 10 of the MCU control circuit chip U4 via a resistor R16. The execution switch S1 is divided into two paths, one path is connected to the 5V power supply via a resistor R30, and the other path is connected to the KEY2 pin 7 of the MCU control circuit chip U4. The capacitor C19 is connected in parallel to the execution switch S1. At both ends, the read-write switch S2 is divided into two paths, one is connected to the KEY pin 19 of the MCU control circuit chip U4, and the other path is connected to the SYS-ERR pin 11 of the MCU control circuit chip U4 through the resistor R35, the light-emitting diode D11, and the resistor R39. One end of the light-emitting diode D7 is connected to the node of the light-emitting diode D11 and the resistor R35, and the other end is grounded. One end of the light-emitting diode D9 is connected to the node of the light-emitting diode D11 and the resistor R35, and the other end is connected to the A-DRX pin 18 of the MCU control circuit chip U4.

[0010] A further optimized technical solution is that the DALI interface circuit includes a DALI signal input terminal, a rectifier chip U8, transistors Q2, Q3, Q5, MOS tube Q4, and photoelectric couplers U6 and U7; the input terminal of the rectifier chip U8 is connected to the DALI signal input terminal, the ceramic gas discharge tube G1 is connected in parallel to both ends of the signal input, the base of the transistor Q2 is connected to the positive output terminal of the rectifier chip U8 via a resistor R25, the emitter is connected to the positive output terminal of the rectifier chip U8, the collector is connected to the base of the transistor Q3, the emitter of the transistor Q3 is connected to the base of the transistor Q2, the collector is connected to the output terminal of the photoelectric coupler U6, and the base is connected to the rectifier chip U8 via resistors R37, R41, and R45. The negative output terminal of the rectifier chip U8 is connected to the negative output terminal of the rectifier chip U8, the drain of the MOS tube Q4 is connected to the emitter of the transistor Q2, the gate of the MOS tube Q4 is divided into two paths, one path is connected to the output terminal of the photoelectric coupler U7 through the resistor R40, the source of the MOS tube Q4 is connected to the base of the transistor Q5 through the resistor R43, the emitter of the transistor Q5 is connected to the negative output terminal of the rectifier chip U8, the resistors R46, R47 and the capacitor C16 are connected in parallel between the node of the MOS tube Q4 and the resistor R43 and the negative output terminal of the rectifier chip U8, the output receiving signal DRX of the photoelectric coupler U6 is given to the signal receiving terminal of the MCU control circuit chip U4, and the photoelectric coupler U7 outputs the start signal DTX to the signal receiving terminal of the MCU control circuit chip U4.

[0011] The beneficial effect of adopting the above technical solution is that: the present invention converts the mains 220Vac through the constant voltage module ZM1 to output a 24V constant voltage, and the 24V constant voltage is stepped down to a voltage of 15-16.5V through the step-down conversion circuit U1, and the DALI bus voltage is formed through the VT1 output control, and the power supply circuit U2 outputs a stable voltage to the MCU and U1, and U1 controls the switch and output of the DALI bus voltage. When TCS1 detects that the output current is greater than 250MA, the single chip turns off VT1, the DALI bus output voltage is turned off, the indicator light flashes, and the buzzer sounds an alarm. After all the lamps are not lit for 5 minutes, the MCU controls the relay output to turn off all power supplies, without the loss of standby power consumption, and energy is saved. The unit code switch S2 is a read-write control switch. When S2 is ON, the single chip microcomputer writes the parameters of the address corresponding to the lamp (scene, address, group, dimming parameters, etc.) into the corresponding lamp. When S7 is OFF, the parameters of the required address are read, and the change will be executed after pressing S1. It has relay protection function, local storage function, one-key burning function, convenient replacement, good protection and other advantages:

[0012] 1. Coupling, the DALI bus power supply and the DALI dual color temperature power supply realize mutual control and data exchange;

[0013] 2. The circuit is simple, with one IC (control chip);

[0014] 3. Burn (enter) the software program with one key, manually dial the dual-color temperature power supply of the corresponding address once, and the DALI bus power supply program will be burned (entered) into the new dual-color temperature power supply;

[0015] 4. Local storage function (storage scenes, storage settings);

[0016] 5. Readback function: when the DALI main power supply fails and the bus power supply needs to be replaced, the newly installed DALI bus power supply only needs to dial a key to back up all DALI dual-color temperature power supply scenes and setting data under the control of the bus power supply to the DALI bus power supply;

[0017] 6. The status detection function is mainly controlled by the relay. When some DALI dual-color temperature power supplies under the control of the DALI bus power supply fail, the DALI bus power supply will automatically cut off the power to protect the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the circuit diagram of the main circuit of the present invention;

[0019] Figure 2 It is the MCU control circuit of the present invention;

[0020] Figure 3 It is a circuit diagram of the alarm circuit of the present invention;

[0021] Figure 4 is a circuit diagram of a read-write switch circuit of the present invention;

[0022] Figure 5 is a circuit diagram of a DALI interface circuit of the present invention;

[0023] Figure 6 It is a circuit diagram of a relay protection circuit of the present invention;

[0024] Figure 7 is a circuit diagram of a power supply circuit of the present invention;

[0025] Figure 8 It is a logic diagram of the working principle of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 7 As shown, the present invention discloses a DALI bus power supply, including a 24V constant voltage power supply conversion circuit, a DC-DC step-down circuit, an MCU control circuit, a DALI interface circuit, a power supply circuit, a current threshold feedback circuit, a MOS tube switch circuit, a relay protection circuit, an alarm circuit and a data read-write switch circuit; the city power is converted into 24V direct current by the 24V constant voltage power supply conversion circuit, and then stepped down to a voltage of 15-16.5V by the DC-DC step-down circuit, and then the DALI bus voltage is output by the MOS tube switch circuit; and the output current value of the DC-DC step-down circuit is monitored by the current threshold feedback circuit, and the detection data is transmitted to the MCU control circuit, and the MCU control circuit performs threshold judgment. If it is greater than the set threshold, the DALI bus output voltage is turned off by the MOS tube switch circuit, and protection and alarm are performed by the relay protection circuit and the alarm circuit. The DALI interface circuit is used for sending and receiving DALI signals, and the DALI signals are transmitted to the MCU control circuit for data interactive control, which is used to control the DALI power supply; the data read-write switch circuit is used to burn in or change the software program of the control chip of the MCU control circuit.

[0028] A further optimized embodiment is that the DC-DC buck circuit includes a buck chip U1, the CS pin 1 of the chip is short-circuited with the DC pin 8 and the IC pin 7, the SE pin 2 is divided into three paths, the first path is grounded through the negative electrode of the diode D1, the second path is grounded through the capacitor C7, and the third path is divided into two paths after passing through the inductor L1, one path is connected to the pin 5 of the TCS1 type current sensor of the current threshold feedback circuit, and the other path is grounded through the resistors R3 and R5, the CT pin 3 is grounded through the capacitor 6, the GND pin 4 is grounded, the IN- pin 5 is connected to the node of the resistors R3 and R5, and the VCC pin is connected to the positive output end of the 24V constant voltage power supply conversion circuit.

[0029] A further optimized embodiment is that the current threshold feedback circuit includes a TCS1 type current sensor, pin 1 of the chip is connected to PSA pin 9 of the MCU control circuit chip U4 via resistor R2, pin 2 is grounded, pin 3 is connected to the gate of the MOS tube VT1 via resistor R10, pin 4 is connected to the source of the MOS tube, and pin 5 and pin 3 are connected in parallel and then connected to the output end of the DC-DC buck circuit.

[0030] A further optimized embodiment is that the MOS transistor switch circuit is composed of a MOS transistor VT1, a transistor VT2, VT3, VT4, VT5, VT6 and a chip U3, the source of the MOS transistor VT1 is connected to pin 3 of the TCS1 type current sensor chip, the drain outputs the DALI bus voltage through a diode D2 and a resistor R9, the gate is connected to the collector of the transistor VT3, the base of the transistor VT3 is connected to the collector of the transistor VT6 through resistors R12 and R18, and the emitter of the transistor VT3 is connected to a 24V constant voltage supply The positive output end of the power conversion circuit, the base of the transistor VT6 is connected to the PSSW pin 13 of the MCU control circuit chip U4 through the resistor R24, the emitter is grounded, the gate of the MOS tube VT1 and the collector of the transistor VT3 are short-circuited with the node of the resistor R12 and the resistor R18, and the pin 1 of the chip U3 is divided into three paths, the first path is connected to the A-DRX pin 18 of the MCU control circuit chip U4, the second path is connected to the base of the transistor VT5 through the resistor R17, and the third path is connected to the emitter of the transistor VT5 through the capacitor C11. The emitter, pin 2 is grounded, pin 3 is connected to a 5V power supply through a resistor R7, capacitor C10 and resistor R15 are connected in parallel, one end is connected to pin 3, and the other end is grounded, pin 4 is divided into three paths, the first path is connected to the BACK pin 8 of the MCU control circuit chip U4 through resistor R14 and capacitor C12, the second path is connected to the junction of the diode D2 and the resistor R9 through resistor R6, the third path is connected to the drain of the MOS tube VT1 through capacitor C9, resistor R19, and resistor R11, pin 5 is connected to a 5V power supply, and the collector of the transistor VT5 is connected to the collector of the transistor VT5. The base is connected to a 5V power supply via resistors R16 and R7, the collector of transistor VT2 is connected to the junction of resistor R6 and diode D2, the base is connected to A-DTX pin 17 of MCU control circuit chip U4 via resistor R13, the emitter is connected to the base of transistor VT4 via resistor R20, the collector of transistor VT4 is connected to A-DTX pin 17 of MCU control circuit chip U4 via resistor R13, the emitter is grounded, resistors R22 and R23 are connected in parallel, one end of which is connected to the emitter of transistor VT2, and the other end is grounded.

[0031] A further optimized embodiment is that the alarm circuit and the data read-write switch circuit include a buzzer BZ1, an execution switch S1, and a read-write switch S2. The pin 2 of the buzzer BZ1 is connected to the collector of the transistor VT17. The base of the transistor VT17 is connected to the BELL pin 10 of the MCU control circuit chip U4 via a resistor R16. The execution switch S1 is divided into two paths, one path is connected to the 5V power supply via a resistor R30, and the other path is connected to the KEY2 pin 7 of the MCU control circuit chip U4. The capacitor C19 is connected in parallel to the two execution switches S1. The read-write switch S2 is divided into two paths, one of which is connected to the KEY pin 19 of the MCU control circuit chip U4, and the other path is connected to the SYS-ERR pin 11 of the MCU control circuit chip U4 through the resistor R35, the light-emitting diode D11, and the resistor R39. One end of the light-emitting diode D7 is connected to the node of the light-emitting diode D11 and the resistor R35, and the other end is grounded. One end of the light-emitting diode D9 is connected to the node of the light-emitting diode D11 and the resistor R35, and the other end is connected to the A-DRX pin 18 of the MCU control circuit chip U4.

[0032] A further optimized embodiment is that the DALI interface circuit includes a DALI signal input terminal, a rectifier chip U8, transistors Q2, Q3, Q5, MOS tube Q4, and photoelectric couplers U6 and U7; the input terminal of the rectifier chip U8 is connected to the DALI signal input terminal, the ceramic gas discharge tube G1 is connected in parallel to both ends of the signal input, the base of the transistor Q2 is connected to the positive output terminal of the rectifier chip U8 via a resistor R25, the emitter is connected to the positive output terminal of the rectifier chip U8, the collector is connected to the base of the transistor Q3, the emitter of the transistor Q3 is connected to the base of the transistor Q2, the collector is connected to the output terminal of the photoelectric coupler U6, and the base is connected to the rectifier chip U8 via resistors R37, R41, and R45. The negative output terminal of the rectifier chip U8 is connected to the negative output terminal of the rectifier chip U8, the drain of the MOS tube Q4 is connected to the emitter of the transistor Q2, the gate of the MOS tube Q4 is divided into two paths, one path is connected to the output terminal of the photoelectric coupler U7 through the resistor R40, the source of the MOS tube Q4 is connected to the base of the transistor Q5 through the resistor R43, the emitter of the transistor Q5 is connected to the negative output terminal of the rectifier chip U8, the resistors R46, R47 and the capacitor C16 are connected in parallel between the node of the MOS tube Q4 and the resistor R43 and the negative output terminal of the rectifier chip U8, the output receiving signal DRX of the photoelectric coupler U6 is given to the signal receiving terminal of the MCU control circuit chip U4, and the photoelectric coupler U7 outputs the start signal DTX to the signal receiving terminal of the MCU control circuit chip U4.

[0033] A further optimized embodiment is that the relay protection circuit includes a relay U5, pin 1 is connected to pin 2 via the cathode of diode D5, pin 2 is connected to the collector of transistor VT8, the emitter of the transistor is grounded, and the base is divided into two paths via resistor R27, one path is connected to RLY pin 12 of MCU control circuit chip U4, and the other path is connected to 5V power supply via resistor R36 and light-emitting diode D10; the function of the relay is to cut off the LN power supply after all lamps are turned off, and the standby power consumption of the lamps is 0, which is a power saving function.

[0034] Its working principle is:

[0035] The circuit of the present invention comprises a 24V power supply module circuit ZM1, a step-down circuit composed of U1 and its peripheral circuits, a U4 single-chip microcomputer minimum system, a DALI interface circuit, a single-chip microcomputer power supply circuit U2, a U5 relay control circuit, a BZ1 buzzer alarm circuit, a DIP switch S2 data reading and writing circuit and an S1 key switch execution circuit.

[0036] The 220Vac mains is converted to a 24V constant voltage by the constant voltage module ZM1. The 24V constant voltage is stepped down to 15-16.5V by the step-down conversion circuit U1. The DALI bus voltage is formed by the output control of VT1. The microcontroller power supply circuit U2 outputs a stable voltage to the MCU U1. U1 controls the switch and output of the DALI bus voltage. When TCS1 detects that the output current is greater than 250MA, the microcontroller turns off VT1, the DALI bus output voltage is turned off, the indicator light flashes, and the buzzer sounds an alarm. When all the lamps are off for 5 minutes, the MCU controls the relay output to turn off all power supplies. There is no standby power consumption loss, which saves energy. The unit dip switch S7 is a read-write control switch. When S7 is ON, the microcontroller writes the parameters of the address corresponding to the lamp (scene, address, group, dimming parameters, etc.) into the corresponding lamp. When S7 is OFF, the parameters of the required address are read. After pressing S1, the change will be executed.

[0037] The DALI interface circuit is composed of Q2, Q3, Q4, Q5 and other components to form a receiving and transmitting circuit, which is used to couple another DALI bus. The MCU can forward the DALI data commands that meet the rules to the next one.

Claims

1. A DALI bus power supply, characterized in that: It includes a 24V constant voltage power supply conversion circuit, a DC-DC step-down circuit, an MCU control circuit, a DALI interface circuit, a power supply circuit, a current threshold feedback circuit, a MOS tube switch circuit, a relay protection circuit, an alarm circuit and a data read-write switch circuit; the city power is converted into 24V direct current by the 24V constant voltage power supply conversion circuit, and then stepped down to a voltage of 15-16.5V by the DC-DC step-down circuit, and then outputs the DALI bus voltage by the MOS tube switch circuit; and the output current value of the DC-DC step-down circuit is monitored by the current threshold feedback circuit, and the detection data is transmitted to the MCU control circuit, and the MCU control circuit performs threshold judgment. If it is greater than the set threshold, the DALI bus output voltage is turned off by the MOS tube switch circuit, and protection and alarm are performed by the relay protection circuit and the alarm circuit. The DALI interface circuit is used for sending and receiving DALI signals, and the DALI signals are transmitted to the MCU control circuit for data interaction control, which is used to control the DALI power supply; the data read-write switch circuit is used to burn in or change the software program of the control chip of the MCU control circuit; The DC-DC buck circuit includes a buck chip U1, a CS pin 1 of the chip is short-circuited with a DC pin 8 and an IC pin 7, a SE pin 2 is divided into three paths, a first path is grounded via the negative electrode of a diode D1, a second path is grounded via a capacitor C7, and a third path is divided into two paths after passing through an inductor L1, one path is connected to a pin 5 of a TCS1 type current sensor of a current threshold feedback circuit, and the other path is grounded via resistors R3 and R5, a CT pin 3 is grounded via a capacitor 6, a GND pin 4 is grounded, an IN- pin 5 is connected to the junction of resistors R3 and R5, and a VCC pin is connected to the positive output terminal of a 24V constant voltage power supply conversion circuit; The current threshold feedback circuit includes a TCS1 type current sensor, the pin 1 of which is connected to the PSA pin 9 of the MCU control circuit chip U4 via a resistor R2, the pin 2 is grounded, the pin 3 is connected to the gate of the MOS tube VT1 via a resistor R10, the pin 4 is connected to the source of the MOS tube, and the pin 5 and the pin 3 are connected in parallel and then connected to the output end of the DC-DC buck circuit; The relay protection circuit includes a relay U5, wherein pin 1 is connected to pin 2 via the cathode of a diode D5, pin 2 is connected to the collector of a transistor VT8, the emitter of the transistor is grounded, and the base is divided into two paths via a resistor R27, one path is connected to the RLY pin 12 of the MCU control circuit chip U4, and the other path is connected to a 5V power supply via a resistor R36 and a light-emitting diode D10.

2. A DALI bus power supply according to claim 1, characterized in that: The MOS switch circuit is composed of a MOS tube VT1, a transistor VT2, VT3, VT4, VT5, VT6 and a chip U3. The source of the MOS tube VT1 is connected to the pin 3 of the TCS1 current sensor chip, the drain outputs the DALI bus voltage through the diode D2 and the resistor R9, the gate is connected to the collector of the transistor VT3, the base of the transistor VT3 is connected to the collector of the transistor VT6 through the resistors R12 and R18, and the emitter of the transistor VT3 is connected to the positive electrode of the 24V constant voltage power supply conversion circuit. At the output end, the base of transistor VT6 is connected to the PSSW pin 13 of the MCU control circuit chip U4 via resistor R24, the emitter is grounded, the gate of MOS tube VT1 and the collector of transistor VT3 are short-circuited with the node of resistor R12 and resistor R18, and the pin 1 of chip U3 is divided into three paths, the first path is connected to the A-DRX pin 18 of the MCU control circuit chip U4, the second path is connected to the base of transistor VT5 via resistor R17, and the third path is connected to the emitter of transistor VT5 via capacitor C11. 2 is grounded, pin 3 is connected to a 5V power supply via resistor R7, capacitor C10 and resistor R15 are connected in parallel, one end is connected to pin 3, and the other end is grounded, pin 4 is divided into three paths, the first path is connected to BACK pin 8 of MCU control circuit chip U4 via resistor R14 and capacitor C12, the second path is connected to the junction of diode D2 and resistor R9 via resistor R6, the third path is connected to the drain of MOS tube VT1 via capacitor C9, resistor R19 and resistor R11, pin 5 is connected to a 5V power supply, and the collector of transistor VT5 is connected to Resistors R16 and R7 are connected to a 5V power supply, the collector of transistor VT2 is connected to the junction of resistor R6 and diode D2, the base is connected to A-DTX pin 17 of MCU control circuit chip U4 via resistor R13, the emitter is connected to the base of transistor VT4 via resistor R20, the collector of transistor VT4 is connected to A-DTX pin 17 of MCU control circuit chip U4 via resistor R13, the emitter is grounded, resistors R22 and R23 are connected in parallel, one end of which is connected to the emitter of transistor VT2, and the other end is grounded.

3. A DALI bus power supply according to claim 1, characterized in that: The alarm circuit and data read-write switch circuit include a buzzer BZ1, an execution switch S1, and a read-write switch S2. Pin 2 of the buzzer BZ1 is connected to the collector of the transistor VT17. The base of the transistor VT17 is connected to the BELL pin 10 of the MCU control circuit chip U4 via a resistor R16. The execution switch S1 is divided into two paths, one of which is connected to a 5V power supply via a resistor R30, and the other is connected to the KEY2 pin 7 of the MCU control circuit chip U4. The capacitor C19 is connected in parallel to both ends of the execution switch S1. The read-write switch S2 is divided into two paths, connected to the KEY pin 19 of the MCU control circuit chip U4, and the other is connected to the SYS-ERR pin 11 of the MCU control circuit chip U4 via a resistor R35, a light-emitting diode D11, and a resistor R39. One end of the light-emitting diode D7 is connected to the node of the light-emitting diode D11 and the resistor R35, and the other end is grounded. One end of the light-emitting diode D9 is connected to the node of the light-emitting diode D11 and the resistor R35, and the other end is connected to the A-DRX pin 18 of the MCU control circuit chip U4.

4. A DALI bus power supply according to claim 1, characterized in that: The DALI interface circuit includes a DALI signal input terminal, a rectifier chip U8, transistors Q2, Q3, Q5, a MOS tube Q4, and photoelectric couplers U6 and U7; the input terminal of the rectifier chip U8 is connected to the DALI signal input terminal, the ceramic gas discharge tube G1 is connected in parallel to both ends of the signal input, the base of the transistor Q2 is connected to the positive output terminal of the rectifier chip U8 via a resistor R25, the emitter is connected to the positive output terminal of the rectifier chip U8, the collector is connected to the base of the transistor Q3, the emitter of the transistor Q3 is connected to the base of the transistor Q2, the collector is connected to the output terminal of the photoelectric coupler U6, and the base is connected to the negative electrode of the rectifier chip U8 via resistors R37, R41, and R45. At the output end, the drain of the MOS tube Q4 is connected to the emitter of the transistor Q2, and the gate of the MOS tube Q4 is divided into two paths, one of which is connected to the output end of the photoelectric coupler U7 through the resistor R40, and the source of the MOS tube Q4 is connected to the base of the transistor Q5 through the resistor R43, and the emitter of the transistor Q5 is connected to the negative output end of the rectifier chip U8. Resistors R46, R47 and capacitor C16 are connected in parallel between the node of the MOS tube Q4 and the resistor R43 and the negative output end of the rectifier chip U8. The output receiving signal DRX of the photoelectric coupler U6 is given to the signal receiving end of the MCU control circuit chip U4, and the photoelectric coupler U7 outputs the start signal DTX to the signal receiving end of the MCU control circuit chip U4.

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