Drive Circuits and Electronics
A drive circuit and reset circuit technology, applied in the field of circuits, can solve the problems such as the inability to select the power supply normally, the drive circuit unable to control the turn-off of the field effect transistor, etc.
Active Publication Date: 2021-07-09
SHANGHAI YAOHUO MICROELECTRONICS CO LTD
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Problems solved by technology
[0003] In the relevant driving circuit, when the signal voltage input at the power input terminal is a positive voltage, the driving circuit can also normally control the on and off of the field effect transistor, and when the signal voltage input at the power input terminal is a negative voltage, The drive circuit cannot control the shutdown of the FET, resulting in the inability to normally select whether to supply power to the load
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[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0056] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or...
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The invention provides a driving circuit and electronic equipment, which can ensure the normal control of the field effect tube by the driving circuit. The drive circuit is connected to the power supply channel, and the power supply channel includes a power input terminal, a first field effect transistor and a load connected in sequence, and the drive circuit includes: a control module, a first switch and a selection module; the first end of the first switch is used as the first end of the first switch The first terminal is connected to the grid of the first field effect transistor; the output terminal of the control module is connected to the first terminal of the first switch, and the control module is used to output the first gate control signal to control the first switch when the first switch is turned off. The field effect transistor is turned on; the two input terminals of the selection module are respectively connected to the power input terminal and the ground terminal, the output terminal of the selection module is connected to the second terminal of the first switch, and the selection module is used to select the power input terminal and the ground terminal input Among the signals, the signal with a lower voltage is output as the second gate control signal to control the first field effect transistor to be turned off when the first switch is turned on.
Description
technical field [0001] The invention relates to the technical field of circuits, in particular to a driving circuit and electronic equipment. Background technique [0002] In electronic equipment, a power supply supplies power to a load through a power channel. In order to choose whether to supply power to the load according to needs, a field effect transistor (or it can be called: field effect transistor, transistor, power tube, or switch tube, etc.), such as NMOS (N-Metal-Oxide- Semiconductor), when the FET is turned on, it supplies power to the load, and when the FET is turned off, it stops supplying power to the load. The turn-on and turn-off of the field effect tube needs to be controlled by a corresponding drive circuit. [0003] In the relevant driving circuit, when the signal voltage input at the power input terminal is a positive voltage, the driving circuit can also normally control the on and off of the field effect transistor, and when the signal voltage input ...
Claims
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IPC IPC(8): G09G3/20
CPCG09G3/20
Inventor 黄雷
Owner SHANGHAI YAOHUO MICROELECTRONICS CO LTD