What’s a Phase Divider?

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A phase divider, also called phase inverter, is a device that transforms a single-phase current into two or more currents of equal amplitude but opposite phases. Phase refers to the polarity of the current. This type of phase divider is made by modifying various types of amplifiers or optimizing a transformer to effectively divide currents. These tools are widely used in the manufacturing and musical instrument industries to control power.

Unity-gain inverter amplifiers can be made into phase dividers. When the device is activated, two currents are produced from one original current. One replicates the polarity of the original current, while the other reverses it. This particular device protects against reverse current.

Another way to produce this instrument is to use a split-load phase inverter. Since the 1930s, these devices have been used to deliver cleaner sound from amplifiers. The phase divider circuit of a split-load phase inverter consumes about 250 volts of power when splitting the phases in two, a relatively low voltage.

A differential pair amplifier can easily be modified to become a phase divider amplifier. The original purpose of a differential pair amplifier is to ensure that the output is proportional to the difference between the voltage of the two inputs. To steer the amplifier towards the splitting stages, a common source must be used which supplies a constant amount of power for both inputs. This will ensure that the total current from both inputs is held constant, such that if one input increases in voltage, the other must necessarily decrease in voltage. Voltage compensation leads to the production of opposing phases, characteristic of a typical phase divider.

One of the least complicated ways to manufacture a phase divider is to use a transformer. Normally, a transformer is used to convert one voltage to another voltage. This technology is exploited to divide currents by using two secondary windings to induce voltage, instead of that used in a typical transformer. The new phase splitter transformer now produces two currents from two separate inputs.

There are two main practical uses for phase dividers. In the manufacturing industry, these devices are used to control the speed of electric motors in all types of industrial machines. In the musical instrument industry, these devices are used to amplify the power of electrical audio equipment. They are particularly sought after for their energy saving capabilities. Companies in both industries significantly reduce energy conversion costs by using a phase divider.

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