The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2016
Filed:
Jan. 06, 2015
Hong Fu Jin Precision Industry (Wuhan) Co., Ltd., Wuhan, CN;
Hon Hai Precision Industry Co., Ltd., New Taipei, TW;
Yong-Zhao Huang, Wuhan, CN;
HONG FU JIN PRECISION INDUSTRY (WuHan) CO., LTD., Wuhan, CN;
HON HAI PRECISION INDUSTRY CO., LTD., New Taipei, TW;
Abstract
A buzzer circuit is connected to a drive circuit. The buzzer circuit includes a buzzer and a control unit. The control unit includes an electronic switch, a first resistor, a second resistor, and a constant voltage component. A control end of the electronic switch is connected to a power pin of the buzzer through the first resistor, and is grounded through the constant voltage component. A first end of the electronic switch is connected to a grounded pin of the buzzer. A second end of the electronic switch is grounded through the second resistor. When the buzzer receives a high level drive signal, the electronic switch is turned on. A voltage between the control end and the second end of the electronic switch is constant, the constant voltage component provides a constant voltage to the second resistor, and a current of the second resistor is constant.