Isolation power supply system based on single MOS tube

Abstract

The utility model relates to an isolation power supply system based on a single MOS tube. The isolation power supply system comprises chip resistors RS1 to RS4, chip capacitors CS1 to CS6 and CS8, a safety capacitor CS7, electrolytic capacitors ES1 and ES2, diodes DS1 to DS4, a PMOS tube QS2, a transformer TR1 and an LDO chip US1. The positive electrode of the electrolytic capacitor ES2, one end of the chip resistor RS4 and the primary side input of the transformer TR1 are connected to a main system power supply HVCC; the chip resistor RS3, the chip capacitor CS8 and the diode DS4 are connected in parallel between the other end of the chip resistor RS4 and the main system reference ground; the positive electrode of the diode DS4 is connected to a main system reference ground GND, and the negative electrode of the diode DS4 is connected with a power-on and power-off detection signal PowerUpDownTest of the MCU end of the electric energy meter. The device is reasonable in design, compact in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to an isolation power supply system based on a single MOS tube, which is particularly suitable for a low-power power supply system. Background Art

[0002] The isolated power supply is a key power device, whose main function is to provide safe isolation in the electrical system to prevent electrical faults and personal injury. Through an isolation transformer or other isolation devices, the isolated power supply can completely isolate the input power supply from the output power supply to ensure that the back-end equipment will not be damaged when it is subjected to electrical shock or fault. In addition, the isolated power supply can also suppress electrical noise and interference, and improve the stability and reliability of the system.

[0003] The demand for communication functions of electric energy meters in some overseas regions is increasing, but due to the limitations of equipment structure and space layout, traditional transformer and switching power supply solutions are stretched. These solutions are often large in size and complex in structure, making it difficult to adapt to compact electric energy meter designs. Therefore, it is urgent to design an isolated power supply system based on a single MOS tube, which can not only meet the needs of multiple communication functions, but also achieve efficient and stable power supply under structural constraints. Utility Model Content

[0004] The technical problem to be solved by the utility model is generally to provide an isolated power supply system based on a single MOS tube. The utility model uses a MOS tube to control the power supply system, which has a fast response speed, low power of the power supply system, energy saving and high efficiency, and can extend the service life of the product. The electric energy meter and the communication terminal are isolated, which is safe and reliable, ensuring that the system can operate stably for a long time.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] In order to achieve improved management of power supply, the utility model discloses an isolated power supply system based on a single MOS tube, including chip resistors RS1-RS4, chip capacitors CS1-CS6, CS8, safety capacitor CS7, electrolytic capacitors ES1, ES2, diodes DS1-DS4, PMOS tube QS2, transformer TR1 and LDO chip US1;

[0007] The positive electrode of electrolytic capacitor ES2, one end of chip resistor RS4 and the primary input of transformer TR1 are connected to the main system power supply HVCC;

[0008] The chip resistor RS3, the chip capacitor CS8 and the diode DS4 are connected in parallel between the other end of the chip resistor RS4 and the reference ground of the main system;

[0009] The anode of diode DS4 is connected to the reference ground GND of the main system, and the cathode of diode DS4 is connected to the up and down power detection signal Power_UpDown_Test at the MCU end of the energy meter;

[0010] The anode of the diode DS3 is connected to the up and down power detection signal Power_UpDown_Test, and the cathode of the diode DS3 is connected to the input voltage DVDD of the MCU end of the energy meter;

[0011] One end of the chip resistors RS1 and RS2 are connected to the control signal Power_Control of the isolated power system at the MCU end of the energy meter at the same time, the other end of the chip resistor RS1 is connected to the input voltage DVDD at the MCU end of the energy meter, the other end of the chip resistor RS2 is connected to the gate of the PMOS tube, the source of the PMOS tube is connected to the output end of the primary side of the transformer TR1, and the drain of the PMOS tube is connected to the reference ground GND of the main system.

[0012] The same-name end of the secondary side of the transformer TR1 is connected to the anode of the diode DS1, and the cathode of the diode DS1 is respectively connected to the isolated communication power supply SPMVDD and the voltage input end of the LDO chip US1;

[0013] The diode DS2, the electrolytic capacitor ES1, and the chip capacitors CS1, CS2, and CS3 are connected in parallel between the isolated communication power supply SPMVDD and the isolated communication reference ground MGND;

[0014] The cathode of diode DS2 and the anode of electrolytic capacitor ES1 are connected to the isolated communication power supply SPMVDD, and the reference ground of LDO chip US1 is connected to the isolated communication reference ground MGND;

[0015] Chip capacitors CS4, CS5, and CS6 are connected in parallel between the voltage output terminal +5V of the LDO chip US1 and the isolated communication reference ground MGND;

[0016] The safety capacitor CS7 is connected in parallel between the main system reference ground GND and the isolated communication reference ground MGND.

[0017] The voltage output terminal +5V of the LDO chip outputs 5V voltage to the communication module.

[0018] The beneficial effects of the utility model are as follows: it has low power consumption, helps to reduce energy consumption and achieve green environmental protection, has compact design, high energy conversion efficiency, and stable and reliable operation. It has a simple system and low cost. It is suitable for a variety of scenarios, meets different needs, and is flexible and convenient. It has low power, reduces the risks of overheating, short circuit, etc., and ensures safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, in this embodiment, an isolated power supply system based on a single MOS tube is used. After the electric energy meter is connected to the AC power, the MCU side judges whether it is working through the input up and down power detection signal Power_UpDown_Test. After the MCU is started, the control signal Power_Control of the isolated power supply system is output as a square wave signal with a fixed frequency, so that the PMOS tube is turned on at the frequency, and the secondary side of the transformer generates an electromotive force, which is rectified by the diode DS1 and clamped by the diode DS2. The output voltage is input into the LDO chip US1, wherein the electrolytic capacitor ES1 and the chip capacitors CS1, CS2, and CS3 play the role of energy storage filtering. The voltage +5V output by US1 is supplied to the communication module through the chip capacitors CS4, CS5, and CS6 energy storage filtering.

[0021] It is obvious for those skilled in the art to combine multiple technical solutions of the present invention, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0022] The designed circuit includes chip resistors RS1-RS4, chip capacitors CS1-CS6, CS8, safety capacitor CS7, electrolytic capacitors ES1, ES2, diodes DS1-DS4, PMOS tube QS2, transformer TR1 and LDO chip US1. The positive electrode of electrolytic capacitor ES2, one end of chip resistor RS4 and the primary input of transformer TR1 are connected to the main system power supply HVCC. Chip resistor RS3, chip capacitor CS8 and diode DS4 are connected in parallel between the other end of chip resistor RS4 and the main system reference ground. At this time, the positive electrode of diode DS4 is connected to the main system reference ground GND, and the negative electrode is connected to the up and down power detection signal Power_UpDown_Test at the MCU end of the energy meter. The positive electrode of the dual diode is connected to the up and down power detection signal Power_UpDown_Test, and the negative electrode is connected to the input voltage DVDD at the MCU end of the energy meter. One end of chip resistors RS1 and RS2 are simultaneously connected to the control signal Power_Control of the isolated power system at the MCU end of the energy meter. The other end of chip resistor RS1 is connected to the input voltage DVDD at the MCU end of the energy meter. The other end of chip resistor RS2 is connected to the gate of the PMOS tube. The source of the PMOS tube is connected to the output end of the primary side of transformer TR1, and the drain of the PMOS tube is connected to the main system reference ground GND. The same-name end of the secondary side of transformer TR1 to the primary side is connected to the positive pole of diode DS1, the negative pole of diode DS1 is connected to the isolated communication power supply SPMVDD, and is also connected to the voltage input end of LDO chip US1. Diode DS2, electrolytic capacitor ES1, chip capacitors CS1, CS2, and CS3 are connected in parallel between the isolated communication power supply SPMVDD and the isolated communication reference ground MGND, and the negative pole of diode DS2 and the positive pole of electrolytic capacitor ES1 are connected to the isolated communication power supply SPMVDD, the reference ground of LDO chip is connected to the isolated communication reference ground MGND, and chip capacitors CS4, CS5, and CS6 are connected in parallel between the voltage output end +5V of LDO chip and the isolated communication reference ground MGND. Safety capacitor CS7 is connected in parallel between the main system reference ground GND and the isolated communication reference ground MGND. The voltage output end +5V of LDO chip outputs 5V voltage to the communication module.

[0023] After the energy meter is connected to the AC power, the MCU determines whether it is working through the input power up and down detection signal Power_UpDown_Test. After the MCU is started, the control signal Power_Control of the isolated power system is output as a square wave signal with a fixed frequency, so that the PMOS tube is turned on at this frequency, and the secondary side of the transformer generates an electromotive force, which is rectified by the diode DS1 and clamped by the diode DS2. The output voltage is input into the LDO chip US1, among which the electrolytic capacitor ES1 and the chip capacitors CS1, CS2, and CS3 act as energy storage filters. The voltage +5V output by US1 is supplied to the communication module through the chip capacitors CS4, CS5, and CS6 energy storage filters.

Claims

1. An isolated power supply system based on a single MOS tube, characterized in that: Including chip resistors RS1-RS4, chip capacitors CS1-CS6, CS8, safety capacitor CS7, electrolytic capacitors ES1, ES2, diodes DS1-DS4, PMOS tube QS2, transformer TR1 and LDO chip US1; The positive electrode of electrolytic capacitor ES2, one end of chip resistor RS4 and the primary input of transformer TR1 are connected to the main system power supply HVCC; The chip resistor RS3, the chip capacitor CS8 and the diode DS4 are connected in parallel between the other end of the chip resistor RS4 and the reference ground of the main system; The anode of diode DS4 is connected to the reference ground GND of the main system, and the cathode of diode DS4 is connected to the up and down power detection signal Power_UpDown_Test at the MCU end of the energy meter; The anode of the diode DS3 is connected to the up and down power detection signal Power_UpDown_Test, and the cathode of the diode DS3 is connected to the input voltage DVDD of the MCU end of the energy meter; One end of the chip resistors RS1 and RS2 are connected to the control signal Power_Control of the isolated power system at the MCU end of the energy meter at the same time, the other end of the chip resistor RS1 is connected to the input voltage DVDD at the MCU end of the energy meter, the other end of the chip resistor RS2 is connected to the gate of the PMOS tube, the source of the PMOS tube is connected to the output end of the primary side of the transformer TR1, and the drain of the PMOS tube is connected to the reference ground GND of the main system.

2. The isolated power supply system based on a single MOS tube according to claim 1, characterized in that: The same-name end of the secondary side of the transformer TR1 is connected to the anode of the diode DS1, and the cathode of the diode DS1 is respectively connected to the isolated communication power supply SPMVDD and the voltage input end of the LDO chip US1; The diode DS2, the electrolytic capacitor ES1, and the chip capacitors CS1, CS2, and CS3 are connected in parallel between the isolated communication power supply SPMVDD and the isolated communication reference ground MGND; The cathode of diode DS2 and the anode of electrolytic capacitor ES1 are connected to the isolated communication power supply SPMVDD, and the reference ground of LDO chip US1 is connected to the isolated communication reference ground MGND; Chip capacitors CS4, CS5, and CS6 are connected in parallel between the voltage output terminal +5V of the LDO chip US1 and the isolated communication reference ground MGND; The safety capacitor CS7 is connected in parallel between the main system reference ground GND and the isolated communication reference ground MGND.

3. The isolated power supply system based on a single MOS tube according to claim 1, characterized in that: The voltage output terminal +5V of the LDO chip outputs 5V voltage to the communication module.

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