DC switching power supply application of new technologies and development

A high-frequency switching power supply Principle

    High frequency switching rectifier is generally the first alternating current directly through the diode rectifier, filter into DC, after switching power to transform into a high-frequency alternating current through the high-frequency transformer transformer isolation by fast recovery diode frequency rectifier, inductor-capacitor filter output , as shown in Figure 1.


    1.1 The main circuit

    From the AC mains input, DC output of the whole process, including:
    (1) Input filter: its role is clutter filter grid exists, but also hindered the machine generated noise fed back into the public grid.
    (2) rectifier and filter: the grid AC power rectifier for a more smooth DC, and power factor correction circuit to provide a stable DC power supply.
    (3) Power Factor Correction: located between the rectifier filter and inverter to improve power factor, in order to eliminate the harmonic current pollution caused by the rectifier circuit power grid and reduce reactive loss.
    (4) inverter: the rectified DC into high frequency alternating current, which is the core part of the high-frequency switching power supply, the higher the frequency, size, weight and output power than the smaller.
    (5) the output rectifier and filter: According to the load needs to provide a stable and reliable DC power supply.1.2 control circuit
    The one hand, sampling from the output, with the set standards, and then to control the inverter to change the frequency or pulse width, output stability, on the other hand, according to data provided by the test circuit protection circuit identification, provide control circuit on the machine for a variety of protective measures.1.3 detection circuit
    Various parameters in addition to running in to provide protection circuit also provides a variety of display meter data for the staff on duty to observe and record.1.4 The auxiliary power supply
    The switching regulator circuit required for the varied requirements of the power supply (AC DC voltage power supply of various grades).

    2 a typical application

    Intelligent high-frequency switching power supply describes the Guangzhou the Jishi domains (POWEC).

    The 2.1 QPS11/10 system works

    The system works rectifier AC input into DC output, and then sent to the DC power distribution modules in parallel by bus and battery fuse module, distribution module internal shunt switch or fuse output to the load for electricity, while also charging the battery. When utility power is interrupted, power to the load from the battery. Control module to communicate via RS485 and the alarm module and rectifier. Data measurement, acquisition by the alarm module is responsible for its object, including mains, DC power distribution module, the battery fuse module and SAMSUNG V25 Battery . The system work, the control module to monitor a variety of state and adjust its parameters automatically perform scheduled the task. An alarm signal system abnormalities, and display output through the alarm module in the control module. Its system principle is shown in Figure 2:
2.2 composition of system modules introduced2.2.1 Rectifier Module
    Rectifier module of POWEC is the FM resonance technology, with power factor correction plug-in modular, intelligent rectifier, referred to as the PMP (Powec Modular Power).
    PMP11.48SIC is a plug-in modular rectifier with power factor correction, which uses high-frequency resonant switching technology, especially in the field of telecommunications. Input: 205 ~ 250 V AC ± 10% Output: 48 V DC, 1100 W; a wide range of input voltage, power factor compensation, dynamic load sharing, hot-swappable, no need to fan cooling, light weight (3.1 kg) and other advantages.2.2.2 The control module
    Control module for the monitoring of power system operation, all information are clear written expression, the boot menu and window operation, with RS232 interface, referred to as PCU (Powec Control Unit).
    The PCU 10.24-48D is a microprocessor based control unit can PMP10.00 the SIC rectifier and PMP11.48SIC of rectifier power system to conduct a comprehensive monitoring. Input: 18 ~ 72 V DC. Have: to provide a clear text message, guided operation with the HP iPAQ hw 6515 PDA battery discharge test function, with the RS232 test function, additional alarm contacts can be used to connect an external alarm device, full of the parameter settings, etc..
    PCU10.24-48D is a microprocessor-based alarm and control unit can monitor located on the three sub-rack 17: PMP10.00SIC or PMP11.48SIC module. This plug-in module can monitor the system state of the mains input, the output voltage, current and PMP module can monitor the number of external conditions, such as the distribution fuse, load or battery from the relays and the battery capacity test, battery symmetrical voltage, temperature and so on. The control menu is simple and provide operational guidance on the front panel buttons operate the system. The alarm interface board (0398) on the additional alarm contacts can be used to connect an external alarm device.
    Alarm: DC high voltage alarms, DC low voltage alarms, load / battery from the alarm, DC fuse failure, module failure, mains failure, OLYMPUS LI-10C Charger battery failure, symmetrical alarm, high temperature alarm, overload alarm.
    All alarms by LED indication and alarm content is displayed on the display, there are four free public contacts outside alarm signal. Otherwise the two open-collector output for low voltage from the function.
    Display: 2 x 16 character LCD screen for display output data, alarm information.
    Communication: PowCom or PAS software on the personal computer and RS232 serial interface on the system for remote monitoring.2.2.3 sub-rack
    Sub-rack can also be mixed control module is used to install the rectifier, small systems can also be built-in DC power distribution unit and Acer Aspire 5720 Battery fuse, depending on the composition of the system to achieve the most economical size, or the PPR (Powec pack Rack) .
    PPR10.24-48D subrack used to hold a PCU10.24-48D and up to five PMP10.10SIC, or PMP11.48SIC module with a 0384 board. Sub rack PPR10.24-48D only used to hold up to six PMP10.10SIC, or PMP11.48SIC module, AC input connector, the DC output connectors and flat cable connected to the alarm signal board attached to the rack. Potentiometer the subracks circuit board can adjust the output voltage of the rectifier, the factory default (48 V system was 53.5 V, 24 V system 26.7 V). Therefore, even if the control module failure, it will not affect the system output voltage. Replace the rectifier module, the module will automatically its output voltage is adjusted to the default value of the appropriate module position module individually insertion and removal, will not interfere with the work of the entire system.
    The sub-rack can pass the address of the route set circuit board rectifier module, multiple sub-rack can parallel output. The system is very adaptable and can be easily configured as a redundant way and N +1 mode system.2.2.4 Distribution Module
    (1) AC power distribution module according to the needs of users to configure single or three phase AC input, the output magnetic trip air switch (MCB), large ones, and capacity of the user, referred to PJU.
    (2) DC power distribution module is divided into the PDUs (Powec Distribution Unit). And PBDU (Powec Battery and Distribution Unit) two of them PBDU contains the SONY DCR-TRV110E battery fuse. A DC power distribution module can have up to 24 outputs. Output trip air switch (MCB) or fuse, Outputs and size is configured according to user needs and provide flexible on or under the outlet wiring. Each output MCB or fuse one to measure the pressure drop across the circuit to monitor. If the MCB or fuse is not connected to the load, even in a disconnected state, it does not produce a warning
    (3) Battery fuse module referred to as the PBF (Powec Battery Fuse Unit), with two-way battery protection and monitoring of each fuse can. Different depending on the state of the battery; battery fuse failure is detected in the fuse to disconnect after 10 minutes. If the fuse is not connected to the battery is disconnected and does not generate an alarm. Fuse fuse puller from very easy to pull out or push the go-line fuse capacity configured according to user needs.

    All power distribution module architecture, the configuration is very flexible, easy to meet the practical needs of users. Vary the output cable to connect the positive and negative depending on the system, if the system is positive, then the output cathode connected to the MCB or fuse, the negative electrode connected to the public bus (DC ground). The system is negative, the output anode connected to the MCB or fuse, cathode connected to the public bus.

    2.2.5 Rack

    The rack is loaded with rectifier sub-racks and power distribution module, referred to as PPC (Powec Power Supply Cabinet), equipped with various types of wall and floor rack, according to the user capacity of the system, room environment matching the appropriate rack, in order to achieve the best possible design options.

    The development trend of three switching power supply

    Power electronics technology and the basic power system, the switching power supply technology at the core. Traditional phased power supply is very large and heavy, high-frequency switching power supply technology, its size and weight will be a significant decline, and can greatly improve energy efficiency, material savings, lower costs. In electric vehicles and AC drive, it is inseparable from the switching power supply technology to change the electricity frequency switching power supply, so as to achieve nearly ideal load match and drive control.

    4 Conclusion

    High-frequency switching power supply is a modular design, reliability and a high degree of intelligence, power, and its small size, low power consumption, high efficiency, low noise, high precision voltage regulator, safe and reliable operation and easy maintenance, is currently in all microwave stations are widely used.
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