System for measuring battery current for electric vehicle
First Claim
Patent Images
1. A system for measuring a current of a battery for an electric vehicle, comprising:
- a current transducer for measuring the battery current during a charge or a discharge, and for generating a corresponding voltage signal;
a voltage-to-PWM (Pulse Width Modulation) converter for converting the voltage signal generated by the current transducer to a PWM signal; and
a power supply unit for supplying power to the current transducer.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for measuring a current of a battery for an electric vehicle includes a current transducer, a voltage-to-PWM (PWM (Pulse Width Modulation) converter, and a power supply unit. The current transducer measures a battery current during a charge or a discharge of the battery, and generates a corresponding voltage signal. The voltage-to-PWM converter converts the voltage signal input generated by the current transducer to a PWM signal. The power supply unit supplies power to the current transducer.
7 Citations
10 Claims
-
1. A system for measuring a current of a battery for an electric vehicle, comprising:
-
a current transducer for measuring the battery current during a charge or a discharge, and for generating a corresponding voltage signal;
a voltage-to-PWM (Pulse Width Modulation) converter for converting the voltage signal generated by the current transducer to a PWM signal; and
a power supply unit for supplying power to the current transducer. - View Dependent Claims (2, 3, 4, 5, 6)
a triangle wave generator for generating a triangle wave input;
a voltage level detector for generating a PWM signal by comparing the voltage signal generated by the current transducer to the triangle wave input generated by the triangle wave generator; and
an open-collector transistor circuit for transmitting the PWM signal to other control units.
-
-
5. The system of claim 4, wherein the voltage-to-PWM converter further comprises a voltage follower for transmitting the voltage signal generated by the current transducer to the voltage level detector, the voltage follower preventing the voltage signal of the current transducer from being partially distorted by a change of impedance of the current transducer.
-
6. The system of claim 1, wherein the power supply unit comprises a DC/DC converter for converting a first power level to a second power level that is directly used by the current transducer, and for supplying the converted second power level to the current transducer.
-
7. A system for measuring a current of a battery for an electric vehicle, comprising:
-
a current level detector for measuring battery current during charging and discharging states of the battery, and for generating a corresponding voltage signal, the current level detector using substantially unipolar power;
an analog-to-digital waveform converter for converting the voltage signal generated by the current transducer to a substantially digital waveform;
a power supply unit for supplying unipolar power to the current transducer. - View Dependent Claims (8, 9, 10)
-
Specification