Control circuit for tap-switching power supplies and multi-tap transformers
US4733158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Aug 21, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P13/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tap-switching circuit for automatically controlling the output voltage of a multi-tap transformer in response to a varying input line voltage and/or system load current demand, includes voltage sensing circuitry in parallel with both the transformer voltage outputs and a voltage comparator for sensing changes in the system load demand requirements. A voltage reference is provided for automatically generating a pre-selected voltage reference level signal for the line and/or system load requirements. Voltage comparison circuitry is operatively connected with the voltage sensing circuitry for generating an enable signal whenever the input line voltage and/or system load current demand requirements sensed by the voltage sensing circuitry falls below the pre-selected voltage reference level signal. A switching circuit is operatively connected to the voltage comparison circuitry, a linear regulator and to at least two taps of the multi-tap transformer for connecting the higher voltage tap to supply a pre-regulator voltage to the linear regulator whenever the enable signal is present, and for disconnecting the higher voltage tap from supplying its pre-regulator output voltage whenever t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.