High-Voltage DC-DC Converters Feature Digital Precision

XP Power has introduced a digital upgrade to its HRF15 series of high-voltage DC-DC converters.

Learn more about the HRF15 series. Video used courtesy of XP Power

These compact 15 W modules now feature PMBus communication for digital monitoring and control. XP Power claims that the devices are suitable for use in noise-sensitive and precision-focused environments, such as mass spectrometry and electron microscopy.

XP Power’s HRF15 Series. Image used courtesy of XP Power

Digitally Enhanced High-Voltage Modules

The HRF15 series delivers up to ±15kV at output currents ranging from 1.0 to 1.5 mA, depending on model selection. With a nominal 24 VDC input, the modules achieve full programmability from 0% to 100% of their rated voltage and current. The digital variants support PMBus communication over I2C for real-time parameter control and status feedback.

With the digital upgrades, XP Power focuses on performance metrics for precision. For example, voltage regulation achieves 0.001% across line and load changes, with ripple below 0.001% and stability rated at 10 ppm/hour. The series also features 1% linearity from 10 to 100% output range and ±1% initial STpoint accuracy.

The digital models also introduce several advanced diagnostic tools to improve system visibility and fault resolution. The black box logging function captures time-stamped operational data surrounding fault events, which aids in post-event analysis and troubleshooting.

Mechanical details of the HRF15. Image used courtesy of XP Power

Similarly, configurable fault flags allow system designers to set threshold-based triggers for parameters such as overvoltage and current limits. These signals can interface directly with system controllers to initiate protective actions or automated shutdown sequences.

Additionally, the converters support coordinated control across multiple units. This feature affords testers a way to centrally manage distributed high-voltage rails. And, with multi-unit synchronization, users can implement phase-matched startup sequences, uniform voltage ramping, and group fault handling through shared communication links. In turn, testers have simpler multi-channel architectures, which enable more consistent operation throughout high-voltage nodes.

Protection features include arc detection, overload protection, short-circuit management, and thermal shutdown at 55°C. The modules conform to UL 61010 and IEC 62368 safety standards.

PMBus in High-Voltage Power Control

PMBus offers a standardized protocol for digital communication between power devices and system controllers. It is based on the I2C physical layer but extends functionality through a defined command structure tailored for power management. As such, devices can report voltage, current, temperature, and fault conditions, while also receiving configuration commands.

PMBus connections. Image used courtesy of Texas Instruments

In high-voltage DC-DC converters, PMBus centralizes control and diagnostics. Designers can implement adaptive regulation strategies, execute remote firmware updates, and gather operational telemetry without adding analog circuitry. With more digital abstraction, designers can reduce calibration complexity and improve system safety by enforcing programmable limits.

Importantly, PMBus also supports scalability. For example, it enables engineers to coordinate control of multiple power modules through broadcast and group commands. And, in systems with distributed high-voltage channels, PMBus unlocks synchronized operation and efficient fault isolation.

Digital Upgrades, Major Implications

XP Power’s digital update to the HRF15 series helps push the platform to applications that need granular control and transparent data. The updated series is available now through XP Power’s authorized distributors.