High-precision rapid capacitance value measuring circuit applied to resistance-capacitance parallel loop
A measurement circuit, high-precision technology, applied in the direction of capacitance measurement, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve problems such as abnormal faults of capacitor capacitance and abnormal resistance of resistors, and achieve isolation and reduction interference effect
Pending Publication Date: 2021-05-25
TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] During the use of the power unit, due to high temperature aging, overvoltage operation and other reasons, it may cause abnormal capacitance failure of the capacitor and abnormal resistance failure of the resistor.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] A number of embodiments of the present invention will be disclosed in the following figures. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, for the sake of simplifying the drawings, some well-known and commonly used structures and components will be shown in a simple schematic manner in the drawings.
[0027]In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and do not refer to the meaning of order or sequence, nor are they used to limit the present invention, but are only for the purpose of distinguishing the following The components or operations described by the same technical terms are only used, but should not be understood as...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a high-precision rapid capacitance value measuring circuit applied to a resistance-capacitance parallel loop, wherein the measuring circuit comprises three parts, a first part is a high-precision charging circuit, a second part is a discharging circuit and a third part is a high-precision A / D sampling circuit; the high-precision charging circuit comprises a voltage conversion circuit, a low-voltage relay control circuit and a charging resistor; the discharging circuit comprises a discharging MOS tube, a discharging current-limiting resistor and an MOS tube driving circuit. The high-precision A / D sampling circuit comprises two operational amplification circuits, a high-precision A / D sampling chip and a high-speed digital isolation chip. According to the high-precision rapid capacitance value measuring circuit applied to the resistance-capacitance parallel loop, the isolation circuit design is adopted, complete isolation of a digital circuit and an analog circuit can be achieved, and interference between the digital circuit and the analog circuit is reduced.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a high-precision fast capacitance measurement circuit applied to a resistance-capacitance parallel circuit. Background technique [0002] The bridge arm of the MMC flexible DC transmission converter valve is composed of many power units in series, and the power unit includes a DC energy storage capacitor and a voltage equalizing resistor connected in parallel with it. Capacitors are one of the widely used components in power electronic equipment, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion, control, etc. in circuits. In the power unit, its main function is energy storage and filtering, and it is used as an energy conversion element, so it is also called a DC support capacitor here. The main function of the voltage equalizing resistor in the power unit is to safely discharge the DC support capacitor. In addition, when...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 莫跃戴甲水王健李标俊王林江海金涛仇海龙毛臻炫关宇洋王雪埕谢仁杰
Owner TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO