JPS6377489U

JPS6377489U -

Info

Publication number: JPS6377489U
Application number: JP17066686U
Authority: JP
Priority date: 1986-11-05
Filing date: 1986-11-05
Publication date: 1988-05-23

Description

[Brief explanation of the drawing]

第１図はこの考案のインバータの過電流保護装
置の一実施例を示す回路図、第２図および第３図
はこの実施例の動作を説明するための説明図、第
４図はこの考案のインバータの過電流保護装置を
利用したモータの駆動機構を示す回路図、第５図
は従来例を示す回路図、第６図は従来例の動作を
説明するための説明図である。１０……コントローラ、１４……主素子、１８
……電流センサ、２０……コンパレータ、２４…
…第１のフリツプフロツプ、３２……第１のアン
ドゲート、３４……オアゲート、３６……第２の
フリツプフロツプ、３８……遅延回路、４２……
第２のアンドゲート。 Fig. 1 is a circuit diagram showing an embodiment of the inverter overcurrent protection device of this invention, Figs. 2 and 3 are explanatory diagrams for explaining the operation of this embodiment, and Fig. 4 is a circuit diagram showing an embodiment of the overcurrent protection device of this invention. FIG. 5 is a circuit diagram showing a motor drive mechanism using an inverter overcurrent protection device, FIG. 5 is a circuit diagram showing a conventional example, and FIG. 6 is an explanatory diagram for explaining the operation of the conventional example. 10... Controller, 14... Main element, 18
...Current sensor, 20...Comparator, 24...
...first flip-flop, 32...first AND gate, 34...OR gate, 36...second flip-flop, 38...delay circuit, 42...
Second and gate.

Claims

[Claims for Utility Model Registration] In an inverter overcurrent protection device disposed between a main element of the inverter and a controller that outputs an on/off signal for controlling the drive signal of this main element, A current sensor detects the inverter output current, a comparator that compares the inverter output current with an overcurrent limit value and outputs a corresponding signal when an overcurrent is detected, and an output signal from the controller is inputted,
A first AND gate that outputs a high level signal when two input signals are both high level, and an output signal from this first AND gate are input, and if one of the three input signals is high, The output signal from this OR gate and the above comparator is input, and when the input signal from the OR gate changes from low level to high level, it outputs a high level signal, and the comparator A first flip-flop outputs a low level signal when the input signal from the first flip-flop is at a high level; a second AND gate that outputs a level signal for driving the main element; and a second AND gate that outputs a level signal for driving the main element;
The output signal from the first flip-flop and the output signal from the controller are input to the AND gate of the circuit, and when the output signal of the first flip-flop is at a high level, a low level signal is output. , a second flip-flop that outputs a high level signal when the signal from the controller changes from low level to high level and supplies this output signal to the OR gate; and only the low level signal from the first flip-flop. a delay circuit that supplies a high-level signal to the OR gate when the signal is input and continues for a certain period of time; and a circuit that inputs the output signal from the controller to the second AND gate. Inverter overcurrent protection device.