Current, voltage and temperature measuring circuit
First Claim
1. Measuring circuit for current and voltage measurements, with a signal input (RSHH, VBAT, ETS, ETR) for receiving an input signal, chopper means, an amplifier, a digital signal processor containing a digital demodulator and an analog/digital converter arranged between the amplifier and the demodulator, and a signal output for outputting an output signal, characterized by a plurality of signal inputs (RSHH, VBAT, ETS, ETR) for respectively receiving an input signal, all said input signals being measured in reference to a common reference potential (RSHL), wherein one respective chopper is arranged downstream of each signal input (RSHH, VBAT, ETS, ETR).
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Accused Products
Abstract
An ASIC for current, voltage and temperature measurements has signal inputs (RSHH, VBAT, ETS, ETR) for receiving input signals, several choppers, an amplifier, an analog/digital converter and a digital signal output for outputting the result of the measurement and for communicating with a higher-order control unit. The invention proposes that the measuring circuit contain several differential signal inputs (RSHH-RSHL, VBAT-RSHL, ETS-RSHL, ETR-RSHL and VBAT-ETS), wherein one respective chopper/multiplexer is arranged downstream of each signal input.
12 Citations
21 Claims
- 1. Measuring circuit for current and voltage measurements, with a signal input (RSHH, VBAT, ETS, ETR) for receiving an input signal, chopper means, an amplifier, a digital signal processor containing a digital demodulator and an analog/digital converter arranged between the amplifier and the demodulator, and a signal output for outputting an output signal, characterized by a plurality of signal inputs (RSHH, VBAT, ETS, ETR) for respectively receiving an input signal, all said input signals being measured in reference to a common reference potential (RSHL), wherein one respective chopper is arranged downstream of each signal input (RSHH, VBAT, ETS, ETR).
- 12. Measuring circuit for current and voltage measurements, with a signal input (RSHH, VBAT, ETS, ETR) for receiving an input signal, chopper means, an amplifier, a digital signal processor and a signal output for outputting an output signal, characterized by a plurality of signal inputs (RSHH, VBAT, ETS, ETR) for respectively receiving an input signal, all said input signals being measured in reference to a common reference potential (RSHL), wherein one respective chopper is arranged downstream of each signal input (RSHH, VBAT, ETS, ETR) wherein each signal input has its own chopper which can be activated separately and can be connected to the amplifier or to the analog/digital converter by itself acting as a multiplexer or by separate multiplexer means.
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19. Measuring circuit for current and voltage measurements, with a signal input (RSHH, VBAT, ETS, ETR) for receiving an input signal, chopper means, an amplifier, a digital signal processor and a signal output for outputting an output signal, a plurality of signal inputs (RSHH, VBAT, ETS, ETR) for respectively receiving an input signal, all said input signals being measured in reference to a common reference potential (RSHL), wherein one respective chopper is arranged downstream of each signal input (RSHH, VBAT, ETS, ETR), control means for automatically switching over said amplifier between two input channels so that two different input signals to be measured can be applied to said amplifier, wherein one of said different input signals is a current signal and the other input signal is a voltage signal, and the gain of the amplifier is adjustable.
- 20. Measuring circuit for current and voltage measurements, with a signal input (RSHH, VBAT, ETS, ETR) for receiving an input signal, chopper means, an amplifier, a digital signal processor and a signal output for outputting an output signal, a plurality of signal inputs (RSHH, VBAT, ETS, ETR) for respectively receiving an input signal, all said input signals being measured in reference to a common reference potential (RSHL), wherein one respective chopper is arranged downstream of each signal input (RSHH, VBAT, ETS, ETR), control means for automatically switching over said amplifier between two input channels so that two different input signals to be measured can be applied to said amplifier, wherein one of said different input signals is a current signal and the other input signal is a voltage signal, and the chopper operates at a frequency between approximately 5 and approximately 50 kHz.
Specification