Current measuring circuit
Patent Information
- Application Number
- FR2024000635
- Authority / Receiving Office
- FR · FR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2025-07-25
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Claims
Claims
1. Measuring circuit (100; 102) of a current (Imeas; Imeas200) between 1 mA and 100 A comprising: - a first logarithmic amplifier (LogAmp200) adapted to convert said current (Imeas; Imeas200) into a first voltage (LogAmpOut200); and - a second logarithmic amplifier (Amp203, TB202) adapted to provide a second reference voltage (Vref200).
2. The circuit of claim 1, wherein each first, second logarithmic amplifier (LogAmp200, Ref200) comprises an amplifier (Amp202, Amp203) and a bipolar transistor (TB201, TB202).
3. The circuit of claim 1, wherein each first, second logarithmic amplifier (LogAmp200, Amp203) comprises an amplifier (Amp202, Amp203) and a diode.
4. Circuit according to any one of claims 1 to 3, further comprising a resistor (101; R201) adapted to receive said current (Imeas; Imeas200).
5. A circuit according to claim 4, further comprising a filter circuit (103) disposed between said resistor (101; R201) and said first logarithmic amplifier (102; LogAmp200).
6. A circuit according to claim 5, wherein the filter circuit (103) is an electromagnetic interference filter.
7. Circuit according to any one of claims 1 to 6, further comprising a comparator circuit (104) adapted to receive said first voltage (VlogOut) and said second reference voltage (Vref).
8. A circuit according to any one of claims 1 to 7, further comprising an analog-to-digital converter (106).
9. A circuit according to any one of claims 1 to 8, further comprising a temperature sensor (108).
10. A method of measuring a current using the measuring circuit (100) according to any one of claims 1 to 9. [Fig. 1] 100 107 Vref FIG. 1 N> CurrSens200 Ref200 [Fig. 3] 301 Vout 1.0V? 0.9V_ 0.8V _ 0.7V_ 0.6V _ 0.5V _ 0.4V _ 0.3V _ 0.2V_ 0.1V_ 0.0V__[_ 100|.iA 1 mA 0.6V- 0.3V- 0.0V- -0.3V- -0.6V- -0.9V- -1.2V- -1.5V- -1.8V- -2.^-1= 100pA FIG. 3
Citation Information
Patent Citations
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