The power supply automatically adjusts the rectifier ARM
VICOR Power Supply second generation DC-DC Converter accessory module – automatic regulation rectifier module ARM
VICOR Power Supply Design Guide and Application Manual – Full, small and Micro series DC-DC converters and accessory modules
Automatic adjustment of the rectifier module ARM
Automatic regulation rectifier module (ARM); It is an AC front-end module equipped with Vicor power DC-DC converter. With ARM and VICOR DC-DC converters as the core components, high-performance power systems can be formed to meet a wide range of application requirements and meet various safety standards.
The Automatic Regulation Rectifier Module (ARM) contains power switches and control circuits that enable the Vicor power module to automatically regulate rectification, limit inrush current and provide overvoltage protection. The ARM can monitor the power supply and start or turn off the Vicor power DC-DC converter at the lower end to form an orderly power on or off sequence. Using ARM to form a complete AC front end, users only need to add a holding capacitor and a suitable input filter with transient protection.
When the input power is on, the bypass switch of the positive temperature coefficient (PTC) thermistor limiting the surge current is turned on, and the voltage doubling rectifier strap is turned on. In addition, the lower Vicor power supply DC-DC module is turned off by the enabled (EN) line and the bus normal signal (BOK) is at a high level.
1.1 After the input power is connected; The capacitor connected to the output DC bus starts charging, the thermistor limits the charging current, and the charging time constant is determined by the capacity of the holding capacitor and the cold resistance of the thermistor. When the voltage at both ends of the capacitor reaches the peak value of the input AC supply voltage, the slope (dv/dt) of the relationship curve between the capacitor voltage and time is close to zero.
2.1 When the slope of the voltage curve at both ends of the capacitor is close to zero, if the voltage of the DC bus is below 200 V, the voltage doubling rectifier circuit works, so that the DC bus voltage will increase exponentially to twice the peak AC input voltage. If the voltage of the DC bus is higher than 200 V, the voltage doubling rectifier circuit does not work.
3.1 When the slope of the voltage curve at both ends of the capacitor is close to zero, if the DC bus voltage is higher than 235 V, the surge current limiting thermistor is bypassed; If the DC bus voltage is below 235 V, the surge current limiting thermistor is not bypassed by the switch.
4.1 After the thermistor bypass switch is closed, the converter module is enabled to start working after ~ 150 ms.
5.1 After another ~ 150 ms, the normal signal of the bus becomes low. The output voltage of the converter module can be maintained within the range indicated on the specification.