Universal protector analog integrated circuit

Abstract

The invention discloses a universal protector analog integrated circuit for universally improving common characteristics of circuits such as overload, underload, loss of phase, zero sequence or current online detection and automatic reset in motor protection circuits and special protection circuits of pump thereof and air compressors, circuit protection circuits and electric power capacitor protection circuits to form the common protection circuit unit; multiple resistors, diodes and operational amplifier elements as well as connection lines are manufactured by using the microelectronic integration process integrally in the highly integrated universal protector analog integrated circuit; multiple outgoing lines are used to lead the circuit connection lines which need to be connected with outer circuits to the outside of the integrated circuit and multiple electronic devices are compressed to the small integrated circuit so as to make the printed circuit board area of the product greatly reduced, the protection precisely obviously enhanced, the protector shell structure and process simplified and the whole machine cost lowered. The universal protector analog integrated circuit can be widely applied to the fields of electric motors and power capacitors.

Description

technical field [0001] The invention relates to a universal protector, a power capacitor protector, a motor protector, a pump protector, and a line protector, in particular to a universal protector analog integrated circuit, a power capacitor protection circuit, a motor protection circuit, and a pump protection circuit , line protection circuit, zero sequence protection circuit, automatic delay reset circuit and other fields. Background technique [0002] At present, there is no universal protector analog integrated circuit. Most of the analog circuits used for power capacitor protectors, motor protectors, pump protectors, air compressor protectors, and line protectors use several integrated operational amplifiers and several Diodes, triodes, resistors, capacitors and other discrete components are made on the circuit board by plug-in or patch technology. Due to the dense circuit, it is difficult to arrange the wires, and the shell structure is not easy to layout. In order to...

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Problems solved by technology

[0002] At present, there is no universal protector analog integrated circuit. Most of the analog circuits used for power capacitor protectors, motor protectors, pump protectors, air compressor protectors, and line protectors use several integrated operational amplifiers and several Diodes, triodes, resistors, capacitors and other discrete components are made on the circuit board by plug-in or patch technology. Due to the dense circuit, it is difficult to arrange the wires, and the shell structure is not easy to layout. In order to reduce the size of the shell and the circuit board , often adopt simplified circuits, so that the function and accuracy will be affected to a certain extent; at present, the analog circuits of conventional power capacitor protectors, motor protectors, pump protectors, and line protectors mostly use single-phase or three-phase bridge rectifiers The circuit deals with the rectification and synthesis of current signals. Due to the nonlinearity of rectifier diodes, the amplified current signal is severely distorted; the existing three-phase operational amplifier only outputs the highest phase current signal, which is not suitable for phase failure and three-phase unbalance protection. The existing phase failure and three-phase unbalance protection and overload protection do not consider the factors of rated current at the same time; the overall circuit does not have a unified current reference signal; the power capacitor protector cannot reflect the online power capacitor capacity; motor protectors, pump protectors It cannot reflect the online current value; the automatic reset is only partial, and the circuit is not perfect

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