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Control circuit

A technology for controlling circuits and capacitors, which is applied in the electronic field, can solve problems such as unstable power supplies of electronic equipment, and achieve the effects of saving power and preventing work performance from being affected

Active Publication Date: 2014-05-14
TENDYRON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, the voltage of the MIC pin is generally a pulse voltage. If the voltage of the MIC pin is directly controlled to turn on and off the power supply of the electronic device, the power supply of the electronic device will also be unstable due to voltage jitter.

Method used

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  • Control circuit

Examples

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Embodiment 1

[0016] This embodiment provides a control circuit, such as figure 1 shown, including:

[0017] A diode, the anode of which is connected to the MIC pin of the audio interface; when the anode of the diode receives the voltage output from the MIC pin, the diode enters a conduction state.

[0018] Specifically, the diode is used to control the on and off of the path between the MIC pin of the audio interface and the control circuit. An electronic device (for example, a USB key with an audio interface, an audio key, etc.) has an audio interface, and the audio interface includes at least MIC pins, and may of course include left and right channel pins. When the audio interface of the electronic device is connected to an external device (such as a mobile terminal), the MIC pin of the audio interface receives the voltage input from the outside, and transmits the voltage to the anode of the diode, so that the diode enters the conduction state, that is, the MIC is turned on. The path b...

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PUM

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Abstract

The invention provides a control circuit which comprises a diode, a resistor R, a capacitor C, an NMOS transistor, a PNP triode and a circuit voltage pin Vcc. A positive electrode of the diode is connected to an MIC pin of an audio interface and the diode is in a switch-on state when the positive electrode of the diode receives voltage output by the MIC pin. The NMOS transistor is used for enabling a source electrode S of the NMOS transistor to be connected with a drain electrode D of the NMOS transistor when voltage output by the first end of the capacitor is received. The PNP triode is used for enabling an emitting electrode E of the PNP triode to be connected with a collector electrode C of the PNP triode when the PNP triode receives voltage output by the drain electrode D of the NMOS transistor; the circuit voltage pin Vcc is connected to a power source pin VBAT when the emitting electrode E of the PNP triode is connected with the collector electrode C of the PNP triode. According to the control circuit, an electronic device can control an electronic device power source to be switched on and switched off through detection of the voltage input by the MIC pin, power sources are saved, the control circuit can further store electric power of the MIC pin, the power source of the electronic device can be stably controlled, and influence on the electronic device operation performance by shaking of the power source is prevented.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a control circuit. Background technique [0002] When an electronic device (for example, a USB key with an audio interface, an audio key, etc.) has a separate power supply for powering the electronic device, the battery capacity of the electronic device is generally not too large due to its size. In order to save power, it is necessary to control the power on and off of the electronic equipment in real time. In the prior art, when the electronic device detects that the audio interface of the electronic device is connected to the mobile terminal, it cannot control the power on and off of the electronic device by changing the voltage of the MIC pin of the audio interface. [0003] In addition, the voltage of the MIC pin is generally a pulse voltage. If the voltage of the MIC pin is directly controlled to turn on and off the power supply of the electronic device, the power supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/567H03K17/16
Inventor 李东声
Owner TENDYRON CORP
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