Back to results
US 2019/0317153 A1Published application
Sampling circuit, equalization circuit, and system for single cell in series battery pack
AssigneeHuawei Technologies Co., Ltd.
InventorsDenghai PAN, Zejie LV, Yuanzhong WU
Life of this patent
Estimating the term…
Abstract
A sampling circuit, an equalization circuit, and a system for a single cell in a series battery pack are provided. In the sampling circuit provided in this disclosure, the single cell is isolated from a voltage divider resistor in the bleeder circuit by using the first isolation sampling switch, so as to prevent a drain current of the single cell. In addition, sampling errors in sampling voltages collected by the sampling circuit may be offset during differential calculation.
Claims16
A sampling circuit for a single cell in a series battery pack, comprising:
- a controller, an analog-to-digital converter (ADC), a bleeder circuit, a battery pack including n single cells connected in series, and n isolation sampling switches, wherein
- one end of each of the n isolation sampling switches is connected to a first input end of the bleeder circuit, the other ends of the n isolation sampling switches are respectively connected to positive electrodes of the n single cells, and the isolation sampling switches are in a one-to-one correspondence with the single cells;
- a negative electrode of a first single cell in the n single cells is connected to a second input end of the bleeder circuit, and is grounded;
- an output end of the bleeder circuit is connected to a second input end of the ADC, a first input end of the ADC is grounded, and an output end of the ADC is connected to an input end of the controller;
- a first output group of the controller is separately connected to control ends of the n isolation sampling switches to control the n isolation sampling switches to be open or closed;
- and
- the controller sequentially controls the n isolation sampling switches to be closed, and sends voltages to earth of the positive electrodes of the n single cells corresponding to the n isolation sampling switches to the ADC for conversion after the voltages to earth are attenuated by the bleeder circuit, the ADC transmits converted sampling voltage values to the controller, and the controller subtracts two adjacent sampling voltage values to obtain a voltage value of a corresponding single cell.
4 more elements
A sampling circuit for a single cell in a series battery pack, comprising:
- a controller, an analog-to-digital converter (ADC) with communication isolation, a battery pack including n single cells connected in series, n first isolation sampling switches, and n second isolation sampling switches, wherein
- one end of each of the n first isolation sampling switches is connected to a first input end of the ADC with communication isolation, the other ends of the n first isolation sampling switches are respectively connected to positive electrodes of the n single cells, and the first isolation sampling switches are in a one-to-one correspondence with the single cells;
- one end of each of the n second isolation sampling switches is connected to a second input end of the ADC with communication isolation, the other ends of the n second isolation sampling switches are respectively connected to negative electrodes of the n single cells, and the second isolation sampling switches are in a one-to-one correspondence with the single cells;
- an output end of the ADC with communication isolation is connected to an input end of the controller;
- a first output group of the controller is separately connected to control ends of the n first isolation sampling switches and control ends of the n second isolation sampling switches to control the n isolation sampling switches to be open or closed;
- and
- the controller sequentially controls closure of the first isolation sampling switches and the second isolation sampling switches that are connected to all the single cells, and may sequentially send voltages of all the single cells to the ADC with communication isolation for conversion, and sampling voltage values of all the single cells that are converted by the ADC are isolated and transmitted to the controller.
4 more elements
Dependencies are inferred from the claim text.