POWER CONTROL CIRCUIT WITH LOW POWER CONSUMPTION
First Claim
1. A power save circuit (10) comprising start-up means (20), booster means (30), and a power switching means (40) for connecting and disconnecting a power supply (60), wherein said start-up means (20) are arranged to provide, on actuation, a temporary connection (12) from said power supply (60) to at least said booster means (30), which are arranged to generate a switching voltage (SV) which is out of a range of a supply voltage (V) provided by said power supply (60) for activation of said power switching means (40), wherein said power switching means (40) are arranged to connect, on activation, said power supply (60) to said booster means (30) and to a functional circuit (50).
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Accused Products
Abstract
The available battery power on autonomously powered mobile electronic devices, in particular smartcards, is very small but requires a very long shelf life. Thus, even very small rest currents are a big power issue. The invention discloses a power save circuit and method, where a single power switch, e.g. a FET or a MEM switch, can be used to detach the power supply (?) from the whole system and allow the lowest current possible. Further, a combination with a double action button and integration of the power switch provides a solution with a minimum number of components and interconnects. An option for “system wake-up at any button” enables additional power saving during use, without inconvenience to the user.
22 Citations
19 Claims
- 1. A power save circuit (10) comprising start-up means (20), booster means (30), and a power switching means (40) for connecting and disconnecting a power supply (60), wherein said start-up means (20) are arranged to provide, on actuation, a temporary connection (12) from said power supply (60) to at least said booster means (30), which are arranged to generate a switching voltage (SV) which is out of a range of a supply voltage (V) provided by said power supply (60) for activation of said power switching means (40), wherein said power switching means (40) are arranged to connect, on activation, said power supply (60) to said booster means (30) and to a functional circuit (50).
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14. Method for reduction of power consumption in a mobile electronic device having a functional circuit which is power supplied by a limited internal electric power supply having a supply voltage, said method comprising:
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activating said mobile electronic device being in an off-state by the following steps; generating a switching voltage out of the range of said supply voltage; activating a switching element by said switching voltage; and connecting said power supply to said functional circuit by said switching element; shutting down said mobile electronic device being in an on-state by the following steps; stopping said generating of said switching voltage and thus breaking said switching element. - View Dependent Claims (15, 16)
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Specification