Inverter welder output current detecting circuit and detecting method based on direct current signals
An output current detection, inverter welding machine technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of slow response, high cost, complex structure, etc., to reduce usage and production. cost, the effect of reducing the response time
Active Publication Date: 2014-03-05
SHANGHAI TAYOR HEAVY IND GRP +1
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[0004] Aiming at the problems of complex structure, high cost, and slow response speed in the existing inverter welding machine output current detection scheme, the first purpose of the present invention is to provide an inverter welding machine output current detection with simple structure and short response time circuit
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[0021] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
[0022] see figure 1 , which shows the circuit principle diagram of the output current detection circuit of the inverter welding machine based on the DC signal provided by the present invention. It can be seen from the figure that the entire detection circuit is divided into a voltage signal sampling unit at the front and a signal processing unit at the back.
[0023] The voltage signal sampling unit is mainly composed of a current transformer T1, a rectifier diode D1, and a voltage adopting circuit (D2, R1).
[0024] Among them, the current transformer T1 is placed on the primary or secondary of the main transformer (the primary side of the main transformer inputs a DC current signal), detects the primary or secondary of the transformer, and fo...
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The invention discloses an inverter welder output current detecting circuit and detecting method based on direct current signals. According to the inverter welder output current detecting circuit and detecting method based on the direct current signals, through the utilization of the principle that the voltage drop through the breakover of the base electrode and the emitting electrode of a triode Q1 is similar to tube voltage drop of a diode D2, the voltage of the emitting electrode of the triode Q1 and the output current of an inverter welder are in a proportional relation and are output as detecting signals. Therefore, the accurate detection of the output current of the inverter welder can be achieved simply by adopting fewer devices and elements, and a circuit is simple and high in response speed.
Description
technical field [0001] The invention relates to the electric welding machine technology, in particular to the electric welding machine output current detection technology. Background technique [0002] In order to accurately control the welding current, the inverter welding machine needs to detect the output current of the welding machine in real time. At present, devices such as Hall current sensors or shunts are generally used to detect the output current of the welding machine at the output end of the welding machine. The advantage of using the Hall current sensor is to realize the isolation of the detection circuit from the main circuit, but the cost of the Hall current sensor is high, especially the high current Hall sensor; and the Hall current sensor needs power supply, and the detection circuit is complicated. If the shunt is used, the cost is low, but the isolation between the monitoring circuit and the main circuit cannot be realized, and the anti-interference abil...
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Inventor 陈振刚陈良莫文雄莫桂敏翟会杰冯光永沈飞高世杰蔡涛丁俊捷祁剑裘超群邱冀宝徐永胜王琦
Owner SHANGHAI TAYOR HEAVY IND GRP