Protective circuit for protecting chip from misoperation
AssigneeHon Hai Precision Industry Co., Ltd.
InventorHeng-Chen Kuo
Life of this patent
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Abstract
A protective circuit for a chip includes an input terminal for receiving a power supply voltage, an output terminal for outputting a working voltage to the chip, a first BJT and a second BJT. A base of the first BJT is connected to the input terminal and an emitter of the first BJT is grounded. A base of the second BJT is connected to a collector of the first BJT and an emitter of the second BJT is connected to the input terminal. A collector of the second BJT is connected to the output terminal.
Claims14
A protective circuit for protecting a chip from misoperation, the protective circuit comprising:
- an input terminal for receiving a power supply voltage;
- an output terminal for outputting a working voltage to the chip;
- a first Bipolar Junction Transistor (BJT) comprising a base connected to the input terminal, an emitter being grounded, and a collector;
- and
- a second BJT comprising a base connected to the collector of the first BJT, an emitter connected to the input terminal, and a collector connected to the output terminal.
A protective circuit for protecting a chip from misoperation, the protective circuit comprising:
- a voltage detecting circuit for detecting a value of a power supply voltage, the voltage detecting circuit comprising an input terminal receiving a power supply voltage and an output terminal outputting a control signal;
- and
- a voltage switching circuit to turn on or turn off the chip according to the control signal from the voltage detecting circuit, the voltage switching circuit comprising an input terminal receiving the control signal and an output terminal connected to the chip.
A method for ensuring normal operation of an electronic component, comprising the steps of:
- electrically connecting a voltage detecting circuit between an electronic component and a power source capable of activating said electronic component;
- electrically connecting a voltage switching circuit between said voltage detecting circuit and said electronic component;
- detecting supplying voltage of said power source by means of said voltage detecting circuit for providing a control signal to said voltage switching circuit;
- electrically connecting said power source and said electronic component by means of said voltage switching circuit based on said control signal of said voltage detecting circuit when said detected voltage is higher than a threshold voltage preset selectively according to said voltage switching circuit and said electronic component;
- and
- disconnecting said power source and said electronic component by means of said voltage switching circuit based on said control signal of said voltage detecting circuit when said detected voltage is lower than said threshold voltage.
Dependencies are inferred from the claim text.