A method for controlling the current output of sdh8 circuit
A circuit output and circuit technology, applied in the direction of control/regulation system, regulation of electrical variables, instruments, etc., can solve problems such as the inability to effectively improve the accuracy of current measurement
Active Publication Date: 2021-12-31
纬湃科技投资(中国)有限公司
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Problems solved by technology
Based on this standard, a linear two-temperature two-point trimming curve (2T2P algorithm) has been selected to improve the accuracy of current measurement, but this trimming algorithm is only valid when the ambient temperature of the terminal controller TCU is T>25°C, and for temperatures T< The temperature of 25°C cannot effectively improve the current measurement accuracy
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[0052] The method for controlling the current output of the SDH8 circuit according to the present invention will be described below with reference to the accompanying drawings and through embodiments. In the following description, numerous specific details are set forth in order to enable those skilled in the art to fully understand the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Instead, it is conceivable to implement the present invention in any combination of the following features and elements, regardless of whether they relate to different embodiments. Accordingly, the various aspects, features, embodiments and advantages below are by way of illustration only and should not be considered as elements or limitations of the claims unless explicitly stated in the claims.
[0053] figure 1 A circuit diagram of an exemplary SDH8 ASIC is shown, the SDH8 circuit i...
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The invention discloses a method for controlling the current output of an SDH8 circuit. The method includes a testing process and an application process, wherein, in the application process: measuring the current working temperature T of a PCB board arranged with an SDH8 circuit; judging the PCB board Whether the current operating temperature T is lower than a predetermined value; and determine the command sending value for controlling the SDH8 circuit output target current based on the following formula: SPI_T=z(T)*(I_T) 2 +y(T)*I_T+x(T), where I_T is the expected target current output by the SDH8 circuit at the operating temperature T, and x(T), y(T), and z(T) are the operating temperature T function, wherein, depending on whether the current working temperature T of the PCB board is lower than a predetermined value, the equations of the functions x(T), y(T), and z(T) are different.
Description
technical field [0001] The present invention relates to the field of current control, and more particularly, the present invention relates to a method for controlling the current output of an SDH8 circuit. Background technique [0002] For SDH8 (high-side solenoid valve drive chip) ASIC, the change of operating temperature will have a great impact on the accuracy of current output control. The calibration process at the end of the line test removes at least most of the initial error and, if done at different temperatures, also removes much of the temperature drift. [0003] The most stringent standard in the current project is that the accuracy error is limited within + / -10mA within the current range of 200mA to 900mA. Based on this standard, a linear two-temperature and two-point trimming curve (2T2P algorithm) has been selected to improve the accuracy of current measurement, but this trimming algorithm is only valid when the ambient temperature of the terminal controller ...
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 孟亮
Owner 纬湃科技投资(中国)有限公司