Pulsiv's new method of efficiently converting AC to DC is achieved by using a Pulsiv OSMIUM microcontroller to monitor real-time grid conditions, manage power factor correction (PFC), and regulate a high-voltage DC output to support a wide range of compatible DC-DC converters. It maintains a flat efficiency profile over the full load range and complies with strict EMC/THD regulations. Quality, reliability, performance, and availability have been addressed by combining our unique intellectual property with industry-standard devices from carefully selected global tier-1 chip manufacturers.
Key features
Active bridge signals are provided by the Pulsiv OSMIUM microcontroller to drive a high-side low-side MOSFET configuration that increases overall efficiency by up to 1.4% (90 VAC line input). This feature is particularly useful at higher power levels and requires only two MOSFETs. A full active bridge can be implemented with very few additional components.
When the grid supply fails, the Pulsiv OSMIUM microcontroller will produce the signals to discharge the x-capacitor automatically using low-cost switches in the half-active bridge. This replaces alternative and more expensive methods such as using resistors or an additional external silicon chip. When a half-active bridge isn’t fitted, an alternative circuit can be used.
For applications that require hold-up, an optional circuit can be used to activate a Thyristor below a certain voltage threshold (determined by a simple resistor network) and maintain the HVDC output using hardware rather than software.
A warning signal is provided when the grid supply falls below 50 V to give downstream systems the maximum time to take action. This is particularly useful in safety-critical applications or where a controlled shutdown is required.
- Selectable Max HVDC Output
Providing the ability to select the voltage rating of the storage capacitor, allows engineers to optimize the capacitor selection for cost or performance. This flexibility enables engineers to configure the design according to the needs of their application by choosing between 160 V or 200 V capacitors.
- Power Consumption Indicator
The POWER_USED pin displays real-time consumption by toggling at a fixed rate that is directly proportional to the actual delivered power. Our method does not require expensive current measurement techniques, but performs a calculation during each grid cycle.
The SECONDARY_PWM output can be used to drive an auxiliary supply for systems that need power when the DC-DC converter is switched off.
All Pulsiv OSMIUM microcontrollers are combined with commodity system components to produce AC to DC front-end circuit configurations which support a variety of different features and power levels. Once a circuit configuration has been chosen, development engineers can integrate a suitable DC-to-DC converter to produce a complete power supply design.
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