Bi-directional AC DC Power Supply with Guarantee and Cost-saving Features

XYH Bi-directional AC/DC power supply

Product application:

1. Electric vehicle drive motor (controller);

2. Electric vehicle transmission system, powertrain system integration;

3. Ship electric drive, electric drive system test;

4. Motor system test;

5. Test of electric vehicle bidirectional charger;

6. Charge and discharge test of battery pack and battery pack;

7. Capacitor and super capacitor charge and discharge test;

8. UPS EPS system test;

9. DC panel system test;

10. PCs (energy storage inverter).

Product features:

1. Built in AC isolation transformer + LC AC / DC filter, input and output electrical isolation; AC circuit breaker has leakage current protection function to effectively prevent electrical safety accidents;

2. Infineon high voltage IGBT module, two-stage conversion, IGBT circuit, pure digital power frequency isolation power supply;

3. Energy can be fed back to the power grid: it has the characteristics of power supply and load at the same time. In addition to the performance of high-power DC power supply, it can realize the load function of energy automatic feedback to the power grid, and has the outstanding advantages of energy saving, consumption reduction and green environmental protection;

4. The DC DC side adopts carrier phase-shifting circuit to make the DC output side more accurate and less ripple;

5. It can realize the characteristics of wide output voltage range, high precision and fast dynamic response;

6. The principle of PWM rectification + PWM inverter is adopted, and the power factor is ≥ 0.99; THD and injected harmonic current meet the national standard GB / T14549-93;

7. The output has constant voltage, constant voltage current limiting, constant current, constant power and constant resistance modes;

8. The DC support capacitor adopts high-voltage film capacitor, which has reliable performance and long service life;

9. The DC output side adopts high-voltage DC fuse, which can effectively carry out short-circuit protection;

10. The main control part of the power supply adopts all digital control circuit, and the main control chip is ti's DSP chip; Touch screen display;

11. High dynamic characteristics; 10% ~ 90% sudden load output voltage response time ≤ 5ms- 90% ~ 90% switching ≤ 10ms;

With power battery simulation function, the internal resistance of the simulated battery can be freely determined according to the user's operating conditions.

Realize function:

Principle and system application

XYH series power supply adopts two-stage structure, in which the front stage is PWM bidirectional ACDC rectifier / inverter circuit and the rear stage is buck-boost bidirectional DCDC carrier phase shift circuit. The power frequency transformer with special filter design is used to isolate the power grid. The front stage adopts three-phase half bridge circuit and four quadrant operation. The power factor can be greater than 0.99 and the DC bus voltage can be stabilized at the same time. The bus adopts thin-film capacitor support, with good high-frequency characteristics and long service life. IGBT carrier shift staggered output is adopted at DCDC side, which reduces the output voltage ripple on the premise of improving the reliability of power supply, and ensures the superiority of output power quality in product design. The output adopts LC filter design to eliminate high-frequency components and obtain stable DC voltage output

Function description:

1. Supply power to the motor system in the power assembly, ensure the safe shutdown of the equipment and the whole system during the emergency stop of the dynamometer system during the test, and ensure the safety of power consumption, and set the change time for the control command.

2. It is equipped with high-voltage interface terminal, which can easily and quickly connect the high-voltage DC interface box of the tested motor system

3. It has a separate function interface, which shall include general mode, step mode and voltage step, programmable output, and can set current and power protection values

4. The energy can be fed back to the power grid, which not only has the performance of high-power DC power supply, but also can realize the function of automatic energy feeding back to the power grid load in the full power section, so as to ensure that there is no impact on the power grid and no potential safety hazards during emergency shutdown

5. Full bridge IGBT control, SVPWM synchronous rectification technology and interleaved parallel carrier phase shift technology, DCDC bipolar circuit, bidirectional energy flow, total harmonic distortion (THD) ≤ 4%

6. The external equipment control and data transmission interface network ports RS485 and can are available for customers to choose. The output characteristics are controllable by remote communication, and the high-precision bidirectional DC power supply feedback signal can be integrated into the bench monitoring system to realize safety protection linkage with the existing dynamometer system

7. With external voltage compensation function, the equipment reserves external voltage compensation interface

8. Open software communication protocol to facilitate secondary development and software integration

Technical parameter:

Basic function

Bi-directional AC/DC power supply operation mode

The equipment has five operation modes: constant voltage, constant voltage current limiting, constant current, constant power and constant resistance. The operation parameters of voltage, current and power can be set, and the power protection parameters can be set at the same time

Control mode selection function

The equipment can set the control mode of the equipment through the operation interface, including local control, communication control, external analog control and default control mode

1. Local control function

Through the touch screen, control operations such as power operation parameters, operation, stop and fault reset of control equipment can be set. It can also view various parameters of equipment operation and other operation records.

2. Communication control function

The power operation parameters can be set through the communication software or communication command to control the equipment operation stop, fault reset and other control operations, and the equipment operation parameters and operation records can also be viewed through the touch screen.

3. External analog control

Control the operation / stop, fault reset, voltage and current regulation of the equipment through the external analog interface, and monitor the power supply voltage, current, operation status and fault status.

4. Default control

In this control mode, the power supply equipment can be operated through panel operation, communication control and external analog control.

Emergency stop function

The power supply equipment has emergency stop function. In case of emergency, it can stop the power output through the emergency stop button, communication interface and external control interface on the operation panel.

Protective device

The power supply equipment has input protection, output overcurrent protection, output overvoltage protection, power device overtemperature protection, IGBT overcurrent protection and programmable OCP, OVP and opp.

Self discharge function

The power supply output terminal has self discharge function. After the power supply stops output, the power supply can reduce the voltage at the output terminal below the safe voltage within 30s.

Normal operation.