Shutdown circuit for a switching regulator in a remote controlled television receiver
US4516168A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1982 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Nov 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/185
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a switching regulator power supply, the primary winding of a switching transformer is coupled to a source of input voltage and to a power switch. Secondary supply voltages for a load circuit such as a television receiver are obtained from a secondary winding of the transformer. A regulator control circuit develops a pulse width modulated signal that is used to control the duty-cycle of the power switch for regulating the supply voltages. A disabling circuit is coupled to the regulator control circuit and is responsive to a low bias voltage at a disabling control terminal to change the duty cycle of the power switch in a manner that disables the normal transfer of energy to the load circuit. A disabling input terminal is coupled to an input terminal of a comparator and to the disabling control terminal. The comparator output is coupled to a disabling switch having an output coupled to the disabling control terminal. A first signal generator is responsive to a first condition requiring the disabling of the power supply and develops at the disabling input terminal a first bias voltage that is low enough to, in turn, bias low the disabling control terminal to initiate the disabling …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.