Connecting DC-DC Converters in a Series to Obtain Various Output Voltages
Hello, my name is Jeremy Ferrell. This video is going to explain how to obtain various output voltages from our standard DC-DC products. First, we're going to go through a whiteboard explanation of how to connect our standard products. Then we'll go to the lab for a short demonstration.
Getting Started with Dual-Output Converters
First, we're going to start with our dual-output products. All of our dual-output products are controlled from Vout to the load. For example, with a 15-volt dual, we'll have +15 volts between Vout and Output Common, and 15 volts from Output Common to Vout to Vout-. This is the standard connection using two separate loads and two separate outputs. You can also configure this as a single output converter by leaving the Output Common floating and putting the load only between Vout+ and Vout-. This gives very good regulation because we control between +Vout and Outcom, and the minus output between Outcom and Vout- is cross-regulated.
These will be very well balanced since the load will be balanced. Please keep in mind when you configure it this way that the total output power of the load is the total output of the converter.
Stacking Multiple Converters in Series
You can also stack multiple converters in series as shown to get any output voltage that you want. For example, if you wanted 24 volts at the load, we could use two 12-volt converters. This converter will give plus or minus 12 volts from Vout to Outcom, and this converter will give 12 volts from Vout to Outcom and using this connection system, we can get 24 volts at the load.
The reason these output configurations are possible is because the input and outputs are isolated. There are a couple exceptions to this rule. Our non-isolated products, for example, the DVPL Series and the VPTPCM are non-isolated and therefore should not be connected in a series configuration. Now we'll go to the lab for a short demonstration.
Configuring a Single Output Converter
For the lab part of this demonstration, we're going to use a DVHF2812 dual configured first as a dual output converter, and then next as a single output converter. Our setup is a standard benchtop power supply one load from Vout+ to Outcom represented by these two meters and one load from Vout- to Outcom. Represented by these two meters, you can see between Vout+ and Outcom is +12 volts, and from Vout- to Outcom is -12 volts. We will now configure this as a single output converter. Now we've put the load between Vout+ and Vout-. You can see from this meter we have 24 volts at the load and now the load current, so this is configured as a single output converter.
This concludes our presentation on how to obtain various output voltages from standard VPT products.
