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What is a High Voltage DC-DC Power Supply?
A High Voltage DC-DC Power Supply (HVPS) is a power conversion device that converts a source of direct current (DC) from a low voltage input to a high voltage DC output. This differs from an AC-DC converter which takes an alternating current (AC) input and converts it to a DC current.
H
igh Voltage DC-DC power supplies are used for devices that require DC power at high voltage levels. While there is no industrywide definition of what
“high” voltage is, it is commonly understood to include any voltage above 62VDC. At that level and above it is broadly accepted that contact with this voltage level (or higher) carries an increased possibility of bodily harm, so it must be treated appropriately.
Why do we need High Voltage? The primary reason high voltage (HV) is used in specific applications is driven by physics and the nature of the application. In most HV applications, a low voltage potentially will not satisfy the application’s requirements. For example: • In many instances devices/components, gases or liquids and other media need to be charged electrostatically. Static charges can only be created with high voltage.
• X-rays are produced by colliding electrons emitted from one side of a vacuum tube into the other. Only high voltage can accelerate these electrons fast enough to create the x-rays. The typical voltage needed is at least 40,000VDC.
• In other scenarios, specific molecules (such as DNA) need to be electrically “transported” from one place to another, and the mechanism behind this transport is a high electrical charge – which is, once again, only possible with High Voltage.
How they work: The input DC current driving a typical HVPS can be of any voltage, for example 24VDC. Inside the HVPS, low-voltage level circuitry is used to create a low-voltage AC waveform, which is then applied to the “primary side” a step-up HV transformer. On the “secondary
side”
, the stepped-up AC waveform is then
rectified into a DC voltage. This simple approach works up to a certain HV level, but to achieve much higher voltages, the AC waveform can be applied to a circuit known as a voltage multiplier, which can be designed to create a HV level that is only limited by the number of “multiplier steps” used and the insulation & space available in the HVPS. DC filtering in the HVPS’ output stage is then used to ensure a low ripple high voltage DC output.
What are High Voltage DC-DC Power Supplies Used for? A star product in this space is the UltraVolt 30A-40A series. These are regulated DC-DC high voltage power supplies capable of delivering up to 40,000VDC (40kVDC) output. The UltraVolt 30A-40A Series are compact modular devices, which are ideal for numerous industrial and medical
applications. This includes electrostatic discharge testers, mass spectrometers, plasma generation, x-ray, or wire insulation testers.
Not sure what you need? We provide a reliable and high-quality range of DC-DC high voltage products here at Components Bureau. You can easily find the right component for your system with us, from micro-sized converters to power supplies that deliver up to 40kV DC outputs. When browsing our range of power components available, you can filter products by your electrical specifications. For example, you can select your desired input & output voltages, your desired market sector and more. If you’d like some more information about
our range of products or if you’re looking for expert advice in deploying our products, get in touch and see how we can help!
www.componentsbureau.com
www.electronicsworld.co.uk October 2021 23
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