Direct measurement of an input signal to a loudspeaker to determine and limit a temperature of a voice coil of the loudspeaker
US-9226071-B2 · Dec 29, 2015 · US
Power off delay circuit and method, and audio system with power off delay
US9219352B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9219352-B2 |
| Application number | US-201414165406-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 27, 2014 |
| Priority date | Jun 23, 2009 |
| Publication date | Dec 22, 2015 |
| Grant date | Dec 22, 2015 |
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Abstract
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A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system.
First claim
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What is claimed is: 1. A power off delay circuit, comprising: an external power input terminal; an internal power supply terminal; a capacitor connected to the internal power supply terminal; a switch connected between the external power input terminal and the internal power supply terminal; and a comparator having a voltage source terminal connected to the internal power supply terminal, a first input terminal connected to the external power input terminal, a second input…
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Frequently asked questions
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- What does patent US9219352B2 cover?
- A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power i…
- Who is the assignee on this patent?
- Richtek Technology Corp
- What technology area does this patent fall under?
- Primary CPC classification H04R3/007. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 22 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).