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来源:LM317 Electronics Components编辑:GradConn时间:2021-06-14 04:58:42

1)Constant currentIn this case, the load current is constant and does not vary with voltage, so as the supercapacitor discharges, and the load voltage drops, the load current remains constant. An LED is a good example of this type of load. The final load voltage is given by:

Today most enterprise mobile devices are deployed in a 'star' around some sort of gateway server which deals with maintenance issues like software update, firewall and security, often using third party tools. Since WES is very close to the desktop XP” it can be integrated more directly to the enterprise, and the device designer needs to consider how he wants his device applied, deployed and maintained. The-in place tools to maintain desktops (Microsoft or third party) are an option.

So, for applications development, the programmer has, if he wants, an API to resources like Active Directory, Calendars and so forth. No separate database of names and addresses need be maintained for the embedded devices, and file synchronization facilities are available for 'disconnected' devices.

RLR20C3163FMRSL_Vishay Dale

This means if the OEM and end user wish, the WES device can dial up Microsoft System Update and scan for updates and patches, just like a desktop or laptop today. But realistically, when deployed as a mobile terminal, slot machine, cash register or ATM, the OEM and the enterprise will want more control over the interaction.

This is all available as part of the normal Microsoft enterprise tools set.

Microsoft's standard maintenance console: Windows Server Update Services (WSUS) or Microsoft System Center Configuration Manager (SCCM) can manage WES devices alongside normal desktop and server systems. Stand-alone 'disconnected' devices may require a person to apply updates from a transportable media, like a CD or USB fob.

RLR20C3163FMRSL_Vishay Dale

Another maintenance tool is Watson. Watson is the feature that asks you if you want to report application crash details to Microsoft. An OEM or Enterprise with a complex mobile application can deploy an OEM version of Watson to report crash data directly to them. If the OEM they chooses to get Microsoft involved with the fix, the enterprise or OEM have a way to communicate detailed information.

Finally, part of an update strategy might be to prevent it from happening! Many devices (such as medical equipment) must be operated in an 'approved' configuration. WES includes some write filters that can prevent updates to certain sections of memory, making it impossible to install new applications for example, while still allowing exchange of data.

RLR20C3163FMRSL_Vishay Dale

Summary Windows Embedded Standard offers new operating system options for the embedded device designer. Now he is free to truly design for the enterprise, for the deployed application.

Related links: INTERVIEW: Lorraine Bardeen on Windows Embedded Standard 7Java Essentials for Embedded Networked Devices – Part 1: Windows and Linux set upOptimizing Embedded Designs for the Intel Atom ProcessorGetting real (time) about embedded Windows by using virtualization

The supercapacitor’s high energy storage and high power delivery make it a good choice to buffer a high-power load from a low-power, energy-harvesting source, Figure 2 . The source sees the average load which, with appropriate interface electronics, will be a low-power constant load set at the maximum power point. The load sees a low-impedance source that can deliver the power needed for the duration of the high-power event.

In this example, the average load power is only 0.75 mW. A low-power energy-harvesting source only needs to supply a little more than this power level (to overcome losses) to charge the supercapacitor, which then provides the GPRS module with the power required for transmission.

The supercapacitor is placed after the interface electronics, so the interface electronics and DC/DC converter can be sized for the average power of 125 μW rather than the peak power of 7 W. A discharged supercapacitor will look like a short circuit to the source, so the interface electronics must manage the inrush current when the source is first connected to a supercapacitor at 0 V.

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