A Method of Sampling and Calibrating the Current of a DC Governor
A technology of DC speed regulation and current sampling, applied in the direction of using digital measurement technology for measurement, etc., can solve the problems of thyristor breakdown, easy to be exposed to oxidation and dust, overcurrent and overload faults, etc., and achieve high current detection accuracy and convenience. Debug and apply, achieve the effect of smart selection
Active Publication Date: 2017-06-27
以太传动电气(烟台)有限公司
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Problems solved by technology
The contacts of the DIP switch are exposed to the air and are susceptible to oxidation and dust, which leads to the hidden danger of poor contact in the sampling and calibration methods implemented by the DIP switch
The application range of the DC governor is very wide. When it is used in the occasions with large dust and high corrosion, the inaccuracy of the sampling and calibration circuit will easily lead to serious overcurrent and overload faults, and even serious breakdown of the thyristor. accident happened
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[0023] attached figure 1 Among them is a logic block diagram of a method for sampling and calibrating the current of a DC governor according to the present invention. It includes a single-chip microcomputer unit 11, a 2-digit digital tube display unit 12, an armature current and excitation current detection circuit unit 13, an armature current transformer unit 14, an excitation current Hall sensor unit 15, and an RS232 communication circuit unit 16.
[0024] The single-chip microcomputer unit 11 uses the STC12C5412AD single-chip microcomputer as the control unit. The input end of the 2-digit digital tube display unit 12 is connected to the single-chip microcomputer unit 11, and the 2-digit digital tube displays sampling calibration coding information in real time. The above-mentioned sampling resistor in the armature current and excitation current detection circuit unit 13 is turned on and off by the MOS tube controlled by the single-chip microcomputer, and two equivalent re...
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The invention discloses a method for sampling and calibrating the current of a DC governor, which comprises a single-chip microcomputer unit, a 2-digit digital tube display unit, an RS232 communication circuit unit, an armature current and an excitation current detection circuit unit, an armature current transformer unit, The excitation current Hall sensor unit, the calibration code in the microcontroller unit is uploaded to the DC governor control board CPU; the 2-digit digital tube display unit displays the sampling calibration code or fault code in real time; the microcontroller unit is based on the STC12C5412AD microcontroller to the MOS tube communication Off-off control, which greatly reduces the error voltage in the detection circuit and ensures extremely high current detection accuracy; realizes the intelligent selection of the equivalent resistance value of the sampling calibration, especially realizes the sampling of the single-chip unit by the LCD operation panel and the PC upper computer The direct modification of the calibration code greatly facilitates the debugging and application of the DC speed governor, and is widely used in engineering.
Description
technical field [0001] The invention relates to a method for sampling and scaling the armature current and excitation current of a DC governor, in particular to a current sampling and scaling method for a three-phase fully-controlled thyristor rectifier circuit, which can overcome the problem of sampling and scaling circuits A control method that performs stable armature current and field current detection for poor contact defects. Background technique [0002] The DC speed controller is a DC motor speed control device, which integrates switching power supply, control, and drive circuits, and adopts a three-dimensional structure layout. The DC speed controller converts the AC power into two output DC power sources, one for the field winding of the DC motor and one for the armature winding of the DC motor. The DC speed controller adjusts the DC motor speed by controlling the DC voltage of the armature winding. At the same time, the DC speed controller judges the torque and ...
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IPC IPC(8): G01R19/25
Inventor 杨均涵张超于波
Owner 以太传动电气(烟台)有限公司