参数资料
| 型号： | CBC-EVAL-08 |
| 厂商： | Cymbet Corporation |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | ENERCHIP EH SEH EVAL KIT |
| 产品目录绘图： | CBC-EVAL-08 Module |
| 特色产品： | EnerChip? EH Solar Energy Harvesting Evaluation Kit |
| 标准包装： | 1 |
| 系列： | EnerChip™ EH |
| 主要目的： | 电源管理，可再生能源 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | CBC5300 |
| 主要属性： | 薄膜充电式固态电池 |
| 次要属性： | 太阳能收集器 |
| 已供物品： | 板 |
| 相关产品： | 859-1009-6-ND - IC BATT SOLID ST ENERCHIP 16QFN 859-1009-1-ND - IC BATT SOLID ST ENERCHIP 16QFN 859-1009-2-ND - IC BATT SOLID ST ENERCHIP 16QFN 859-1005-5-ND - IC BATT SOLID ST ENERCHIP 16QFN |
| 其它名称： | 859-1002 |
EnerChip Solar Energy Harvesting Demo Kit
Designing for Pulse Discharge Currents in Wireless Devices
Pulse currents of tens of milliamperes are common in wireless sensor systems during transmit and receive
modes. Pulse discharge currents place special demands on energy storage devices. Repeated delivery of
pulse currents exceeding the recommended load current of a given chemistry will diminish the useful life of
the cell. The effects can be severe, depending on the amplitude of the current and the particular cell chemistry
and construction. Moreover, the internal impedance of the cell often results in an internal voltage drop that
precludes the cell from delivering the pulse current at the voltage necessary to operate the external circuit.
One method of mitigating such effects is to place a low Equivalent Series Resistance (ESR) capacitor across
the main energy storage device. The storage device charges the capacitor between discharge pulses and the
capacitor delivers the pulse current to the load. Specifying the capacitance for a given energy storage device in
an application is a straightforward procedure, once a few key parameters are known. The key parameters are:
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Storage cell impedance (at temperature and state-of-charge)
Storage cell voltage (as a function of state-of-charge)
Operating temperature
Pulse current amplitude
Pulse current duration
Allowable voltage droop during pulse discharge
Two equations will be used to calculate two unknown parameters:
1) the output capacitance needed to deliver the specified pulse current of a known duration;
2) the latency time that must be imposed between pulses to allow the capacitor to be recharged by the
main energy storage device such as the EnerChip solid state storage cell.
Both formulae will assume that the capacitor ESR is sufficiently low to result in negligible internal voltage
drop while delivering the specified pulse current; consequently, only the EnerChip device resistance will be
considered in the formula used to compute capacitor charging time and only the load resistance will be
considered when computing the capacitance needed to deliver the discharge current. The first step in creating
an EnerChip-capacitor couple for pulse current applications is to size the capacitance using the following
formula:
Discharge formula: C = t / [ R * ln (Vmax / Vmin) ]
where:
C = output capacitance, in parallel with EnerChip;
t = pulse duration;
R = load resistance = Vout(average) / Ipulse
Vmin and Vmax are determined by the combination of the EnerChip voltage at a given state-of-charge and the
operating voltage requirement of the external circuit.
Once the capacitance has been determined, the capacitor charging time can be calculated using the following
formula:
Charge formula: t = - R * C * ln [ (Vmax - Vchg) / (Vmin - Vchg) ]
where:
t = capacitor charging time, from Vmin to Vmax
R = EnerChip resistance
C = output capacitance, in parallel with EnerChip
Vmax = final voltage to which the capacitor must be charged prior to delivering the next current pulse
Vmin = initial voltage on the capacitor when charging begins
Vchg = applied charging voltage on the capacitor
DS-72-08 Rev18
?2009 Cymbet Corporation ? Tel: +1-763-633-1780 ? www.cymbet.com
Page 5 of 11
相关PDF资料 |
PDF描述 |
|---|---|
| CBC-EVAL-09 | ENERCHIP EP ENERGY HARVEST EVAL |
| CBC-EVAL-11 | INDUCTIVE CHARGING EVAL KIT |
| CBJ157 | TRS JACK STR PCB SLD POT 3-LUG |
| CBJ70 | TRB JACK STR PCB 3-LUG |
| CBJR12 | MINI-WECO PATCH JACK 75OHM R/A |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CBC-EVAL-08_10 | 制造商:CYMBET 制造商全称:CYMBET 功能描述:EnerChipa?￠ EH Solar Energy Harvester Evaluation Kit |
| CBC-EVAL-09 | 功能描述:电源管理IC开发工具 EnerChip EP Universal EH Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| CBC-EVAL-09 - DSC | 功能描述:CBC915-ACA, CBC51100 EnerChip? Series Power Management, Energy Harvesting Evaluation Board 制造商:cymbet corporation 系列:EnerChip?? 零件状态:有效 主要用途:电源管理，能量收集 嵌入式:否 使用的 IC/零件:CBC915-ACA，CBC51100 主要属性:EM/RF，太阳能，热能，振动能量处理器 辅助属性:- 所含物品:板 标准包装:1 |
| CBC-EVAL-09_13 | 制造商:CYMBET 制造商全称:CYMBET 功能描述:EnerChip EP Universal Energy Harvester Eval Kit |
| CBC-EVAL-10 | 功能描述:电源管理IC开发工具 EnerChip CCEH EH Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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