Power circuit used for industrial weighing instrument

Abstract

The invention discloses a power circuit used for an industrial weighing instrument. The power circuit comprises an alternating-current power source, an adjustable transformer, a first bridge type rectifier circuit, a second bridge type rectifier circuit, capacitors from the first capacitor to the seventh capacitor, a first integrated regulator, a second integrated regulator and a voltage-regulator diode. The first end of the alternating-current power source is connected with the first end of a primary coil of the adjustable transformer, and the second end of the alternating-current power source is connected with the second end of the primary coil of the adjustable transformer. The first end of a first secondary coil of the adjustable transformer is the first power output end of the power circuit, the second end of the first secondary coil of the adjustable transformer is the second power output end of the power circuit, and the first power output end and the second power output end provide filament voltage for the industrial weighing instrument. The alternating-current mode with the adjustable transformer is adopted for generating the filament voltage, and due to the two methods of negative electrode grounding in the filament voltage and the adjustable end grounding of the transformer, it can be avoided that brightness of a vacuum fluorescent display screen is uneven.

Description

technical field [0001] The invention relates to a power supply circuit of a weighing instrument, in particular to a power supply circuit for an industrial weighing instrument. Background technique [0002] Industrial weighing instruments are instruments for measuring various industrial products. There are many types of industrial weighing instruments, and they are widely used in a wide range of fields. They have a huge impact on the development of the national economy. With the development of society, people's requirements for industrial weighing instruments It is getting higher and higher. At present, industrial weighing instruments generally use vacuum fluorescent display screens, and vacuum fluorescent display screens require filament voltage to energize and heat the filaments to obtain good thermal electron emission. The traditional power supply circuit for industrial weighing instruments uses The filament voltage is generated by the DC method, and the filament voltage g...

AI Technical Summary

Problems solved by technology

[0002] Industrial weighing instruments are instruments for measuring various industrial products. There are many types of industrial weighing instruments, and they are widely used in a wide range of fields. They have a huge impact on the development of the national economy. With the development of society, people's requirements for industrial weighing instruments It is getting higher and higher. At present, industrial weighing instruments generally use vacuum fluorescent display screens, and vacuum fluorescent display screens require filament voltage to energize and heat the filaments to obtain good thermal electron emission. The traditional power supply circuit for industrial weighing instruments uses The filament voltage is generated by the DC method, and the filament voltage generated by the DC method causes the brightness of the vacuum fluorescent display to be uneven. The industrial weighing instrument using the traditional power supply circuit is prone to work unstable due to the low filament voltage value, and It is easy to have a short life due to the high filament voltage value, so there is room for improvement in the traditional power supply circuit for industrial weighing instruments

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