| 摘要 |
A load controller coupled to a load for generating and changing a load voltage including a polarity and a magnitude of the load voltage applied to the load. The load controller further includes a polarity selector, a processor, and a transistor module, and the load controller may be coupled to an interface including polarity controls and magnitude controls. The controller may further include a voltage converter coupled to a power source to provide operating power to the controller. The polarity selector responds to the polarity controls for generating a polarity signal exclusively at one of at least one output of the polarity selector. The processor includes a magnitude generator and at least one switch, with the magnitude generator responding to the magnitude controls for generating a magnitude signal. The at least one switch responds to the polarity signal from the at least one output of the polarity selector for switching the magnitude signal and a ground path between a first pair of contacts and a second pair of contacts of the transistor module. The transistor module responds to the switching of the magnitude signal and the ground path to one of either the first pair of contacts or the second pair of contacts by generating a load voltage; i.e. a voltage signal having a magnitude corresponding to the magnitude signal and having a direction or a polarity corresponding to the switching of the magnitude signal and the ground path to one of either the first pair of contacts or the second pair of contacts.
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