Hall current sensor offset correction method and device for welder
A Hall current and offset correction technology, used in measuring devices, instruments, measuring electrical variables, etc., can solve problems such as failure of electrical equipment, large measuring range, and long trouble-free time, saving costs and avoiding current offsets Effect
Pending Publication Date: 2018-09-11
SHANGHAI WTL WELDING EQUIP MFG CO LTD
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Problems solved by technology
Traditional detection components are limited by many factors such as specified frequency, specified waveform, and response lag, and are difficult to be widely used. The new generation of Hall current sensors has a wide measurement range, can measure current with arbitrary waveforms, and has a fast response speed. It can also be displayed in real time, with high measurement accuracy, the measurement accuracy is better than 1%, strong reliability, long average time between failures, strong overload capacity, large measurement range, and the measurement range reaches 10,000 amperes
[0004] Offset current is also called residual current or residual current, which refers to the fact that there is no current flowing in the actual wire, but the Hall sensor detects that there is current flowing, resulting in inconsistent feedback information, ranging from electrical equipment failure to serious harm to personal Safety
[0005] The offset current is mainly caused by the unstable operation of the operational amplifier in the Hall element or electronic circuit. When the sensor is produced, it has been adjusted to zero at 25°C and the primary current is zero. However, in practical applications, Different working environments lead to different degrees of sensor offset, even the same electrical equipment will not always work in the same environment
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[0021] As introduced in the background art, when there is an offset current in the Hall current sensor, it will lead to inaccurate inspection of the actual working device. When the Hall current sensor is used in a welding machine, if a positive offset occurs (meaning that the sensor detects the current in the absence of current, making the feedback current value larger than the actual value, and the offset even reaches ten amperes), There are many problems with the judgment of the current of the welding machine. For example, stop gas supply when the current value is judged to be less than 2 amperes. Because the sampling value is too large, the minimum sampling current will be larger than 2 amperes, causing the welding machine to keep supplying gas; The current is only zero amps. The positive bias of Hall makes many functions impossible to realize, seriously affects the use of the machine, and even poses a safety hazard. The negative bias of the Hall is opposite to the positi...
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The invention discloses a Hall current sensor offset correction method for a welder, and the method includes the following steps: step 1, starting the welding machine, and detecting whether a currentexists in the Hall current sensor; step 2, if the Hall current sensor has current, and compensating a first offset value if no current exists in the Hall current sensor, and then detecting the currentof the Hall current sensor after a preset time; step 3, determining whether the current of the hall current sensor is the same as the preset current, and if not, compensating a second offset value. The invention further discloses a Hall current sensor offset correction device for the welder.
Description
technical field [0001] The invention relates to the technical field of welding machines, in particular to a method and device for offset correction of a Hall current sensor of a welding machine. Background technique [0002] The Hall current sensor is based on the magnetic balance Hall principle, which converts a large current into a secondary small voltage signal, and then obtains the current value. According to the principle of the Hall effect, the current I is passed through the control current terminal of the Hall element, and a magnetic field with a magnetic field strength of B is applied in the normal direction of the Hall element plane, so that an electric potential is generated perpendicular to the direction of the current and the magnetic field. The magnitude of the current flowing in the conductor can be indirectly measured by measuring the magnitude of the Hall potential. Through the conversion of electricity-magnetism-electricity, the sampling of galvanic insula...
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IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 尤志春张辉崔甲
Owner SHANGHAI WTL WELDING EQUIP MFG CO LTD