Current detector circuit
US5635823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Oct 4, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a current detector circuit wherein the sense current flowing through a sense transistor for sensing part of the main current flowing through a main element transistor is flowed through the detection resistor to cause the bipolar or MOS control transistor to detect the voltage drop across the detection resistor, a compensation diode connected to the base or gate of the control transistor and the emitter of the sense transistor and a forward bias generation resistor element for generating a forward bias applied to the diode for a time interval during which the main current flows are arranged. When a sense current flowing through a sense element for sensing part of a main current flowing through a main element is to be flowed through a detection resistor to cause a control transistor to detect a voltage drop across through the detection resistor, the temperature dependence of a threshold voltage between the base and emitter of the control transistor is compensated for, and an output current is detected with an almost constant current level during an operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.