US 10,833,606 B2Granted

Current sampling and processing device and method for an inverter

AssigneeNio Nextev Limited

InventorXiaoqiang Guan

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Abstract

Devices and methods are provided for current sampling and processing associated with, for example, an inverter for an electric vehicle to improve the performance of the inverter. By providing initial parameters for the devices and methods as well as providing estimates of some parameters, the devices and methods can reduce a delay in the time required to perform the sampling and processing of the current. Specifically, parameters for the next beat of a cycle are estimated in the previous beat to complete processing of the current faster, which reduces the delay time. This reduction in delay time increases an output bandwidth of the current loop, i.e., a maximum frequency of an alternating current that can be output by the current loop without attenuation, which improves the performance of the inverter.

Claims11

Dependent claims

A current sampling and processing device for an inverter, which comprises:

an initialization unit for setting initialization parameters during initial start-up of the current sampling and processing device and subsequently enabling a pulse width modulation counter, said initialization parameters at least including an initial value of the pulse width modulation counter, an initial value of a first comparison and a first matching parameter and an initial value of a second comparison and a second matching parameter;
a current sampling triggering and implementing unit that triggers and implements a current sampling operation when the value of the pulse width modulation counter equals to the value of the second comparison and the second matching parameter;
a current loop calculating and updating unit for calculating a value of a new first comparison and a new matching parameter based on a current value sampled by the current sampling triggering and implementing unit and then updating the value of the first comparison and the first matching parameter into the calculated value of the new first comparison and the new matching parameter in the immediately following overflow or underflow time;
a voltage output unit for outputting a voltage corresponding to the updated value of the first comparison and the first matching parameter to control on and off of a circuit device when the updated value of the first comparison and the first matching parameter equals to the value of the pulse width modulation counter.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/718,582Filed 28 Sep 2017
Priority: CN 2016 1 086178629 Sep 2016
Published: US 2018/0091063 A129 Mar 2018
Granted: 10 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02M 7/5395
With automatic control of output wave form or frequency: by pulse-width modulation
H02M 1/36
Details of apparatus for conversion: means for starting or stopping converters
H02M 7/5387
Using semiconductor devices only, e.g. single switched pulse inverters: in a bridge configuration
H02M 1/0009
Details of control, feedback or regulation circuits: devices or circuits for detecting current in a converter