A brief discussion on the application of power modules and DC power supplies

　　Power modules have gradually become the mainstream power electronic devices in the modern electronic manufacturing industry. Due to their flexible changes, simple design and high reliability, they are widely used in communication fields such as switching equipment, access equipment, mobile communications, microwave communications, optical transmission, routers, automotive electronics, aerospace, etc. DC power supply is a device that maintains a steady current in the circuit. It is suitable for large power plants, hydropower plants, ultra-high voltage substations, unmanned substations as a DC power supply for control, signal, protection, automatic reclosing operation, emergency lighting, DC oil pumps, various DC operating mechanisms, secondary circuit instruments, automation device control, AC uninterruptible power supply and other electrical devices.

　　The power module is a power supply that can be directly mounted on a printed circuit board. It can provide power for application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field programmable gate arrays (FPGAs) and other digital or analog loads.

　　1. Isolation:

　　1. Safety isolation: strong and weak current isolation\IGBT isolation drive\surge isolation protection\lightning isolation protection (such as isolation protection of medical electronic equipment in contact with the human body)

　　2. Noise isolation: (isolation of analog circuits and digital circuits, isolation of strong and weak signals)

　　3. Ground loop elimination: remote signal transmission\distributed power supply system

　　2. Protection:

　　Short circuit protection, overvoltage protection, undervoltage protection, overcurrent protection, other protections

　　3. Voltage conversion:

　　Boost conversion\step-down conversion\AC/DC conversion (AC/DC, DC/AC)\polarity conversion (positive and negative polarity conversion, single power supply and positive and negative power supply conversion, single power supply and multiple power supply conversion)

　　4. Voltage stabilization:

　　AC mains power supply\remote DC power supply\distributed power supply system\battery power supply

　　5. Noise reduction:

　　Active filtering

　　The role of DC power supply

　　DC Power Supply

　　[English] DC power

　　GZD, GZD (W) type thyristor high frequency switch DC power supply system

　　Applications:

　　PowerLeaderTM series high frequency switching DC power supply system is suitable for large power plants, hydropower plants, ultra-high voltage substations, unmanned substations as control, signal, protection, automatic reclosing operation, emergency lighting, DC oil pumps, opening and closing of various DC operating mechanisms, secondary circuit instruments, automation device control AC uninterruptible power supply and other electrical devices.

　　The single-wire principle of the PowerLeaderTM series high-frequency switching DC power supply:

　　The GZD (W) high-frequency switching DC power supply consists of four units: a charging panel, a feeder panel, a battery and a DC voltage converter. The charger panel consists of several power modules and a microcomputer monitoring system. The maximum configuration of a single cabinet (panel) is 160A. If a larger output current is required, multiple cabinets (panels) can be connected in parallel. The feeder panel is equipped with a microcomputer insulation online monitoring device. When a grounding accident occurs in a feeder branch, the branch number and grounding resistance of a certain ground can be displayed. A microcomputer battery inspection device can be optionally installed in the battery panel to monitor the battery status at any time. The DC voltage transmitter can use a high-frequency DC transmitter. When the closing bus voltage changes between 180-300V, the output voltage of the control line bus can be firmly stabilized at 220V.

　　The basic principle of high-frequency switching DC power supply module:

　　The PowerLeaderTM series high-frequency switching DC power supply adopts full-bridge phase-shifted pulse width modulation soft switching control technology, which further improves the module efficiency and reduces harmonics. The high-frequency switching DC power supply module adopts three-phase three-wire 380VAC balanced input, no phase sequence requirements, no neutral current loss, and uses advanced peak suppression devices and EMI filter circuits at the AC input end. The high-frequency switching DC power supply uses a full-bridge rectifier circuit to rectify the three-phase AC into DC, and after passive power factor correction (PFC), the DC/DC high-frequency conversion circuit inverts the resulting DC into a stable and controllable DC output. The high-frequency switching DC power supply pulse width modulation circuit (PWM) and soft switching resonant circuit automatically adjust the pulse width and phase shift angle of the high-frequency switch according to the changes in the power grid and load, so that the output voltage and current can remain stable under any permitted conditions. The JZ-22010D series electric high-frequency switching power supply can work as a single machine to complete various basic functions, and can also work in parallel combination, and has a good parallel machine current sharing effect. The high-frequency switching DC power supply can realize the four remote functions of "telemetry, remote communication, remote control, and remote adjustment" by connecting to a microcomputer. The high-frequency switching DC power supply has a complete protection function to ensure the safety and stability of the system under the independent operation of the module or module group and the monitoring of the microcomputer. The high-frequency switching DC power supply module adopts the bus sampling master and slave current sharing control method. When running in parallel, a master module can be automatically selected from the high-frequency switching DC power supply module group, and the external parameters such as current and voltage collected by the shunt are processed to centrally control the output voltage and current of each module. Therefore, even at low current, a better current sharing effect can be obtained.

　　From the above, we know that the power module has the functions of isolation, protection, voltage conversion, voltage stabilization, noise reduction, etc., and the high-frequency switching DC power supply adopts full-bridge phase-shifted pulse width modulation soft switching control technology, which further improves the module efficiency and reduces harmonics. In addition, the high-frequency switching DC power supply has a complete protection function to ensure the independent operation of the module or module group and the safety and stability of the system under microcomputer monitoring.