JPH032268U

JPH032268U -

Info

Publication number: JPH032268U
Application number: JP6179490U
Authority: JP
Priority date: 1990-06-12
Filing date: 1990-06-12
Publication date: 1991-01-10

Description

[Brief explanation of drawings]

第１図は従来の時分割乗算型電子式電力量計の
概略構成を示すブロツク回路図、第２図は第１図
に示すパルス幅変調回路に入力されるアナログ電
圧信号と変調パルス信号との関係を説明する模式
図、第３図は第１図に示す乗算回路に入力された
変調パルス信号とアナログ電流信号とに基づいて
電流パルス信号の生成を説明する模式図、第４図
は従来の時分割乗算型電子式電力量計の更に他の
構成を示すブロツク回路図、第５図は本考案に係
る時分割乗算型電子式電力量計の第１実施例を説
明するためのブロツク回路図、第６図は本考案に
係る時分割乗算型電子式電力量計の第２実施例を
説明するためのブロツク回路図である。Ａ……アナログ電圧信号、Ｂ……変調パルス、
Ｃ……アナログ電流信号、Ｄ……電流パルス信号
、１４〜１７……切り換えスイツチ、１９……電
流信号入力系統、２０……電圧信号入力系統、２
１……パルス幅変調回路、２２……乗算回路、２
３……整流回路。 Fig. 1 is a block circuit diagram showing the schematic configuration of a conventional time-division multiplication type electronic watt-hour meter, and Fig. 2 shows the relationship between the analog voltage signal and modulated pulse signal input to the pulse width modulation circuit shown in Fig. 1. FIG. 3 is a schematic diagram illustrating the generation of a current pulse signal based on the modulated pulse signal and analog current signal input to the multiplication circuit shown in FIG. 1, and FIG. 4 is a schematic diagram illustrating the conventional A block circuit diagram showing still another configuration of the time-division multiplication type electronic watt-hour meter. FIG. 5 is a block circuit diagram for explaining the first embodiment of the time-division multiplication type electronic watt-hour meter according to the present invention. FIG. 6 is a block circuit diagram for explaining a second embodiment of the time division multiplication type electronic watt-hour meter according to the present invention. A...Analog voltage signal, B...Modulation pulse,
C... Analog current signal, D... Current pulse signal, 14-17... Changeover switch, 19... Current signal input system, 20... Voltage signal input system, 2
1...Pulse width modulation circuit, 22...Multiplication circuit, 2
3... Rectifier circuit.

Claims

[Claims for Utility Model Registration] (1) A pulse that pulse width modulates an analog voltage signal input through an analog voltage signal input system and outputs modulated pulses with a pulse width proportional to the voltage in a time series manner. It is composed of a width modulation circuit and a photocoupler having bidirectional conductivity provided after the pulse width modulation circuit, and inputs the modulated pulse output from the pulse width modulation circuit and an analog current signal input system. a multiplication circuit that multiplies a current pulse signal by an analog current signal, and outputs a current pulse signal in time series having a pulse width corresponding to an analog voltage value and an amplitude value corresponding to an analog current value; An electronic circuit for measuring and displaying electric energy based on the current pulse signal. (2) a changeover switch that switches the analog voltage input system so that the analog voltage signal is input to the pulse width modulation circuit; and a switch that switches the analog voltage input system so that the analog current signal is input to the multiplication circuit. Utility model registration claim 1, characterized in that a changeover switch is provided, and the changeover switch is composed of a photocoupler having bidirectional conductivity.
The time-sharing multiplication type electronic watt-hour meter described in .