High-voltage sampling circuit and method
A technology of sampling circuit and acquisition circuit, which is applied in the direction of measuring electrical variables, measuring current/voltage, and using digital measurement technology to measure, etc. It can solve the problem that the redundant design of voltage dividing resistors is not considered, and the identification of abnormal states is not considered. To achieve the effect of enhancing the ability of fault identification
Pending Publication Date: 2022-03-01
WUXI INFIMOTION TECH CO LTD +1
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Problems solved by technology
[0004] At present, these two schemes simply collect high voltage, without considering the identification of abnormal states
And the voltage divider resistor does not consider redundant design
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[0049] The application describes a number of embodiments, but the description is illustrative rather than restrictive, and it will be obvious to those of ordinary skill in the art that within the scope of the embodiments described in the application, There are many more embodiments and implementations. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.
[0050] This application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of this application can also be combined with any conventional features or elements to form unique inventive solutions as defined by the clai...
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The embodiment of the invention discloses a high-voltage sampling circuit and method. The high-voltage sampling circuit comprises a partial voltage acquisition circuit, an isolating circuit, a biasing circuit and an amplifying circuit, the voltage division acquisition circuit is connected with a bus and is configured to acquire bus voltage in a voltage division mode; the isolation circuit is configured to isolate the voltage division acquisition circuit and the amplification circuit; the amplifying circuit is set to amplify the acquired voltage; the bias circuit is set to generate a bias voltage; and the amplifying circuit is also set to superpose the bias voltage to the amplified acquisition voltage, and the bias voltage is used as a sampling output voltage to be sent to the micro-control unit. According to the scheme of the embodiment, the specific fault point can be obtained when the abnormal voltage occurs, and the fault identification capability is enhanced.
Description
technical field [0001] The embodiment of the present application relates to voltage acquisition technology, especially to a high-voltage sampling circuit and method. Background technique [0002] As one of the core components of the three-in-one powertrain (motor, motor controller, reducer) of new energy vehicles, the motor controller affects the power output control and logical fault handling of the entire powertrain. The high-voltage sampling circuit is an important circuit component in the motor controller, and its abnormality will affect the software SVPWM (vector pulse width modulation) algorithm control, software fault strategy processing, and future functional safety protection strategies. [0003] In the current application, the high-voltage sampling circuit scheme can be divided into two types. One scheme uses a large-value voltage divider resistor to isolate the voltage divider, and then it is amplified by the op amp and sent to the MCU (micro control unit); the ot...
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IPC IPC(8): G01R19/25
CPCG01R19/00G01R31/26
Inventor 邓中魁乐林红张志强马永泉吴小萍韩韬于海生王瑞平肖逸阁
Owner WUXI INFIMOTION TECH CO LTD