Low-loss DALI switching power supply

Abstract

The utility model discloses a low-loss DAL I switching power supply which comprises a main circuit, an MOS tube Q1, an MCU control circuit, a feedback circuit and a DAL I bus power supply circuit. The input end of the main circuit is connected with a live wire L and a zero line N, the first output end is connected with the source electrode of the MOS tube Q1, the second output end is connected with one end of the lamp, and the other end of the lamp is connected with the drain electrode of the MOS tube Q1; the MCU control circuit is connected with the feedback circuit and the grid electrode of the MOS tube Q1. The DAL I bus power supply circuit is respectively connected with the main circuit and the feedback circuit; the MCU control circuit can close the DAL I bus power supply circuit through the feedback circuit when receiving the first signal, or open the DAL I bus power supply circuit through the feedback circuit when receiving the second signal; through the above structure, a user can autonomously decide whether to open the DAL I bus power supply circuit according to actual demands, thereby facilitating the reduction of loss, and having very high practicality.

Description

Technical Field

[0001] The utility model relates to the field of LED dimming power supply circuits and controllers, and particularly relates to a low-loss DALI switching power supply. Background Art

[0002] With the vigorous development of the LED power supply lighting industry, LED drive power supplies have now been installed in every household and outdoor lighting, which has also rapidly developed the LED power supply market. At the same time, customers have higher and higher requirements for the performance of LED power supplies. Currently, in practical applications, for DALI switching power supplies, it is undoubtedly necessary to externally connect a bus power supply for control, which increases the customer's usage cost, installation space, and wastes the labor cost of installation. Generally, DALI switching power supplies integrate DALI bus circuits, but in these DALI switching power supplies, the DALI bus circuit is always in a conducting state, resulting in continuous power loss, which is not conducive to energy conservation and emission reduction. Therefore, a DALI power supply that can independently select to switch the DALI bus circuit is very necessary. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a low-loss DALI switching power supply.

[0004] An embodiment of the utility model adopts the following technical solution to solve its technical problem: A low-loss DALI switching power supply includes a main circuit, an MOS transistor Q1, an MCU control circuit, a feedback circuit, and a DALI bus power supply circuit;

[0005] The input end of the main circuit is connected to the live wire L and the neutral wire N, the first output end is connected to the source electrode of the MOS transistor Q1, the second output end is connected to one end of the lamp, and the other end of the lamp is connected to the drain electrode of the MOS transistor Q1;

[0006] The MCU control circuit is respectively connected to the feedback circuit and the gate electrode of the MOS transistor Q1;

[0007] The DALI bus power supply circuit is respectively connected to the main circuit and the feedback circuit;

[0008] The MCU control circuit can turn off the DALI bus power supply circuit through the feedback circuit when receiving the first signal, or turn on the DALI bus power supply circuit through the feedback circuit when receiving the second signal.

[0009] As one of the preferred embodiments of the utility model, the feedback circuit includes an optocoupler U1 and a resistor R8. One end of the light-emitting device of the optocoupler U1 is connected to the MCU control circuit through the resistor R8, the other end of the light-emitting device of the optocoupler U1 is connected to the SGND terminal, and both ends of the light-receiving device of the optocoupler U1 are connected to the DALI bus power supply circuit.

[0010] As one of the preferred embodiments of the present utility model, the DALI bus power supply circuit includes resistors R1-2, R4, R6-7, diodes D3-4, electrolytic capacitor EC1, MOS transistor Q3, MOS transistor Q9, and voltage reference chip U3. One end of resistor R7 is connected to the feedback circuit, and the other end of resistor R7 is respectively connected to the gate of MOS transistor Q3 and one end of resistor R6. The other end of resistor R6 is respectively connected to the source of MOS transistor Q3, the drain of MOS transistor Q9, the positive electrode of electrolytic capacitor EC1, and the cathode of diode D3. The negative electrode of electrolytic capacitor EC1 is connected to the DA- terminal, diode D3 is connected to the VA terminal. The drain of MOS transistor Q3 is respectively connected to the gate of MOS transistor Q9, one end of resistor R1, and the third terminal of voltage reference chip U3 through resistor R4. The source of MOS transistor Q9 is respectively connected to the other end of resistor R1, the other end of resistor R2, and the second terminal of voltage reference chip U3. The first terminal of voltage reference chip U3 is respectively connected to the other end of resistor R2 and the anode of diode D4. The cathode of diode D4 is connected to the DA+ terminal.

[0011] As one of the preferred embodiments of the present utility model, a low-loss DALI switch power supply further includes a wireless communication circuit connected to the MCU control circuit, which is used to communicate with wireless communication devices to obtain a first signal or a second signal.

[0012] As one of the preferred embodiments of the present utility model, the wireless communication circuit is set as an NFC circuit.

[0013] As one of the preferred embodiments of the present utility model, the wireless communication circuit is set as a Bluetooth circuit.

[0014] The beneficial effects of the present utility model: A low-loss DALI switch power supply includes a main circuit, MOS transistor Q1, MCU control circuit, feedback circuit, and DALI bus power supply circuit; the input end of the main circuit is connected to the live wire L and the neutral wire N, the first output end is connected to the source of MOS transistor Q1, the second output end is connected to one end of the lamp, and the other end of the lamp is connected to the drain of MOS transistor Q1; the MCU control circuit is respectively connected to the feedback circuit and the gate of MOS transistor Q1; the DALI bus power supply circuit is respectively connected to the main circuit and the feedback circuit; the MCU control circuit can turn off the DALI bus power supply circuit through the feedback circuit when receiving the first signal, or turn on the DALI bus power supply circuit through the feedback circuit when receiving the second signal; through the above structure, users can independently decide whether to turn on the DALI bus power supply circuit according to actual needs, which is beneficial to reducing losses and has very high practicability. Description of the Drawings

[0015] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0016] Figure 1 It is a schematic block diagram of a low-loss DAL I switching power supply;

[0017] Figure 2 It is a circuit diagram of a low-loss DAL I switching power supply. Detailed implementation manners

[0018] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0019] In the description of the present utility model, the meaning of "a plurality of" is more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the original number, and understandings such as "above", "below", and "within" include the original number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0020] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by "upper", "lower", "front", "rear", "left", "right", etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0021] In the present utility model, unless otherwise clearly defined, words such as "set", "installed", and "connected" should be understood in a broad sense. For example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected, detachably connected, or integrally formed; they can be mechanically connected; they can be the communication inside two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0022] Refer to Figures 1 to 2 , a low-loss DAL I switching power supply, including a main circuit 10, a MOS transistor Q1, an MCU control circuit 20, a feedback circuit 30, and a DAL I bus power supply circuit 40;

[0023] The input end of the main circuit 10 is connected to the live wire L and the neutral wire N. The first output end is connected to the source electrode of the MOS transistor Q1. The second output end is connected to one end of the lamp. The other end of the lamp is connected to the drain electrode of the MOS transistor Q1.

[0024] The MCU control circuit 20 is respectively connected to the feedback circuit 30 and the gate electrode of the MOS transistor Q1.

[0025] The DALI bus power supply circuit 40 is respectively connected to the main circuit 10 and the feedback circuit 30.

[0026] When receiving the first signal, the MCU control circuit 20 can turn off the DALI bus power supply circuit 40 through the feedback circuit 30, or when receiving the second signal, turn on the DALI bus power supply circuit 40 through the feedback circuit 30.

[0027] In the present utility model, the working principle is as follows:

[0028] 1) When the system is powered on, the commercial power will enter the transformer T1 through the rectification circuit 60. The main circuit 10 starts to work, generating a voltage signal VA and a primary ground signal PGND at the primary side, and a voltage signal VB and a secondary ground signal SGND at the secondary side. The voltage signal VB supplies power to pin 1 of the single-chip microcomputer U2 and pin 4 of the wireless signal receiving IC U4 in the wireless communication circuit 50. The MCU control circuit 20 operates. The voltage signal VB is connected to pin 16 of the single-chip microcomputer U2 through the resistor R17. Pin 16 of the single-chip microcomputer U2 is connected to pin 12 of the single-chip microcomputer U2 through the capacitor C3, thereby realizing the reset of the single-chip microcomputer U2. The PWM signal output from pin 2 of the single-chip microcomputer U2 is connected to the gate electrode of the MOS transistor Q1. The drain electrode and the source electrode of the MOS transistor Q1 are turned on, enabling the power supply to output with load normally.

[0029] 2) The user can choose whether to turn on the DALI bus power supply circuit 40 in the power supply according to needs; in the DALI bus power supply circuit 40, the DALI bus power supply circuit 40 includes resistors R1-2, resistor R4, resistors R6-7, diodes D3-4, electrolytic capacitor EC1, MOS transistor Q3, MOS transistor Q9, and voltage reference chip U3. One end of resistor R7 is connected to the feedback circuit 30, and the other end of resistor R7 is respectively connected to the gate of MOS transistor Q3 and one end of resistor R6. The other end of resistor R6 is respectively connected to the source of MOS transistor Q3, the drain of MOS transistor Q9, the positive electrode of electrolytic capacitor EC1, and the cathode of diode D3. The negative electrode of electrolytic capacitor EC1 is connected to the DA- terminal, diode D3 is connected to the VA terminal, and the drain of MOS transistor Q3 is respectively connected to the gate of MOS transistor Q9, one end of resistor R1, and the third terminal of voltage reference chip U3 through resistor R4. The source of MOS transistor Q9 is respectively connected to the other end of resistor R1, the other end of resistor R2, and the second terminal of voltage reference chip U3. The first terminal of voltage reference chip U3 is respectively connected to the other end of resistor R2 and the anode of diode D4, and the cathode of diode D4 is connected to the DA+ terminal; when the user needs to turn on the internal DALI bus power supply circuit 40, a low-loss DALI switching power supply further includes a wireless communication circuit 50 connected to the MCU control circuit 20 for communicating with a wireless communication device to obtain a first signal or a second signal; as a first embodiment of the wireless communication circuit 50, the wireless communication circuit 50 is set as an NFC circuit; as a first embodiment of the wireless communication circuit 50, the wireless communication circuit 50 is set as a Bluetooth circuit.

[0030] First, perform short - range wireless communication on the power supply through a wireless communication device. At this time, the signal (the second signal) is transmitted to pins 7 and 8 of the wireless communication ICU4. The 1 - pin of the wireless communication ICU4 is the power - supply pin, and the 3 - pin of the wireless communication ICU4 is connected to a pull - up resistor R3 to the 1 - pin. The 4 - pin of the wireless communication ICU4 is connected to a pull - up resistor R5 to the 1 - pin, enabling the 5 - pin and 6 - pin of the wireless communication ICU4 to send valid signals to pins 7 and 8 of the microcontroller U2; after receiving the signal, the MCU control circuit 20 processes it and outputs a high - level signal (valid signal) through the 4 - pin of the microcontroller U2. First, it passes through the resistor R8 and then through the light - emitting device of the optocoupler U1 to the ground SGND to form a path; this makes the light - emitting device of the optocoupler U1 conduct. At this time, the light - receiving device of the optocoupler U1 conducts to DA-. At the same time, the primary voltage signal VA is rectified by the diode D3 and flows from the positive terminal to the negative terminal DA- of the electrolytic capacitor EC1 through the electrolytic capacitor EC1 to form a loop. After being filtered by the electrolytic capacitor EC1, a voltage signal VC is generated. The voltage signal VC forms a loop through the resistor R6, resistor R7, and the light - receiving device of the optocoupler U1 to DA-; the source electrode of the MOS transistor Q3 is connected to the voltage signal VC, and the gate electrode is connected to the connection point VG of the resistor R6 and resistor R7. The voltage difference between the voltage signal VC and VG is greater than the conduction threshold of the MOS transistor Q3, so that the source and drain electrodes of the MOS transistor Q3 conduct. At this time, the signal passes through the resistor R4 and is connected to the gate electrode of the MOS transistor Q9, and also through the resistor R1, so that the drain - source electrodes of the MOS transistor Q9 conduct. The loss of the DALI bus circuit can be reduced by changing the resistance values of the resistor R4, resistor R6, and resistor R7; the signal at the gate electrode of the MOS transistor Q9 enters the power - supply terminal of the voltage reference chip U3, causing an internal reference voltage to be generated between pins 1 and 2 of the voltage reference chip U3. The source - electrode signal of the MOS transistor Q9 is connected to the 2 - pin of the voltage reference chip U3. At this time, both ends of the resistor R2 are respectively connected to the 1 - pin and 2 - pin of the voltage reference chip U3, realizing the current - limiting function of the DALI bus circuit. The 1 - pin of the voltage reference chip U3 outputs the DA+ signal through the diode D4, thereby generating the DA+ and DA- signals as the voltage signals of the bus power supply.

[0031] 3) When the user does not need to use the internal bus power supply, a signal (the first signal) can be transmitted to the wireless communication ICU4 through the wireless communication device. Then, the signal from the 4th pin of the wireless communication ICU4 enters the 8th pin of the single-chip microcomputer U2. At this time, after being processed by the MCU control circuit 20, a low-level signal (invalid signal) will be sent through the 4th pin of the single-chip microcomputer U2, passing through the resistor R8 to the light-emitting device of the optocoupler U1. Since the low-level signal is an invalid signal, it cannot turn on the light-emitting device of the optocoupler U1, that is, it cannot turn on the light-receiving device of the optocoupler U1. The voltage signal VA cannot form a loop through the diode D3, resistor R6, resistor R7, and the light-receiving device of the optocoupler U1, and cannot turn on the MOS transistor Q3, making the MOS transistor Q9 unable to turn on. Further, the voltage signal of DA+ will not be generated, and the DALI bus power supply circuit 40 is turned off.

[0032] 4) In the feedback circuit 30, the feedback circuit 30 includes an optocoupler U1 and a resistor R8. One end of the light-emitting device of the optocoupler U1 is connected to the MCU control circuit 20 through the resistor R8, and the other end of the light-emitting device of the optocoupler U1 is connected to the SGND terminal. Both ends of the light-receiving device of the optocoupler U1 are connected to the DALI bus power supply circuit 40.

[0033] 5) The advantages of the present utility model are as follows: Through the above structure, the user can independently decide whether to turn on the DALI bus power supply circuit according to actual needs, which is beneficial to reducing losses and has very high practicality.

[0034] Of course, the present utility model is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent deformations and substitutions are all included within the scope defined by the claims of this application.

Claims

1. A low-loss DALI switching power supply, characterized in that: It comprises a main circuit (10), a MOS tube Q1, an MCU control circuit (20), a feedback circuit (30) and a DAL I bus power supply circuit (40); The input end of the main circuit (10) is connected to the live wire L and the neutral wire N, the first output end is connected to the source of the MOS tube Q1, the second output end is connected to one end of the lamp, and the other end of the lamp is connected to the drain of the MOS tube Q1; The MCU control circuit (20) is respectively connected to the feedback circuit (30) and the gate of the MOS tube Q1; The DAL I bus power supply circuit (40) is connected to the main circuit (10) and the feedback circuit (30) respectively; The MCU control circuit (20) can turn off the DAL I bus power circuit (40) through the feedback circuit (30) when receiving a first signal, or turn on the DAL I bus power circuit (40) through the feedback circuit (30) when receiving a second signal.

2. A low-loss DALI switching power supply according to claim 1, characterized in that: The feedback circuit (30) comprises an optocoupler U1 and a resistor R8, one end of the optocoupler U1 light emitter is connected to the MCU control circuit (20) via the resistor R8, the other end of the optocoupler U1 light emitter is connected to the SGND end, and both ends of the optocoupler U1 light receiver are connected to the DAL I bus power supply circuit (40).

3. A low-loss DALI switching power supply according to claim 1, characterized in that: The DAL I bus power supply circuit (40) comprises resistors R1-2, resistors R4, resistors R6-7, diodes D3-4, electrolytic capacitors EC1, MOS transistors Q3, MOS transistors Q9 and a voltage reference chip U3, one end of the resistor R7 is connected to the feedback circuit (30), the other end of the resistor R7 is respectively connected to the gate of the MOS transistor Q3 and one end of the resistor R6, the other end of the resistor R6 is respectively connected to the source of the MOS transistor Q3, the drain of the MOS transistor Q9, the positive electrode of the electrolytic capacitor EC1 and the cathode of the diode D3 , the cathode of the electrolytic capacitor EC1 is connected to the DA- terminal, the diode D3 is connected to the VA terminal, the drain of the MOS tube Q3 is connected to the gate of the MOS tube Q9, one end of the resistor R1 and the third end of the voltage reference chip U3 through the resistor R4, the source of the MOS tube Q9 is connected to the other end of the resistor R1, the other end of the resistor R2 and the second end of the voltage reference chip U3, the first end of the voltage reference chip U3 is connected to the other end of the resistor R2 and the anode of the diode D4, and the cathode of the diode D4 is connected to the DA+ terminal.

4. A low-loss DALI switching power supply according to claim 1, characterized in that: It also includes a wireless communication circuit (50) connected to the MCU control circuit (20) and used for communicating with a wireless communication device to obtain the first signal or the second signal.

5. A low-loss DALI switching power supply according to claim 4, characterized in that: The wireless communication circuit (50) is configured as an NFC circuit.

6. A low-loss DALI switching power supply according to claim 4, characterized in that: The wireless communication circuit (50) is configured as a Bluetooth circuit.

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