原标题：Cymbet CBC915 EnerChip EP能量收集解决方案

　　Cymbet 公司的CBC915是 EnerChip EP能量处理器，采用先进的最大峰值功率跟踪(MPPT)算法，适用于光，振动，热和RF等能量收集传感器，具有温度补偿的充电控制，内置了能量存储保护，转换电压可调整和低待机功耗，工作温度-20℃ 到 +70℃。本文介绍了CBC915主要特性，能量处理器应用电路，EnerChip™ EP通用能量收集评估套件CBC-EVAL-09主要特性，CBC-EVAL-09演示板方框图，电路图和材料清单。

　　CBC915 EnerChip™ EP Energy Processor

　　Many new energy harvesting based products can be enabled by the EnerChip EP:

　　•Various ambient energy sources can be harvested to power new designs using : Photo Voltaic Cells,Piezoelectric vibration harvesters, Thermoelectric cells, Electromagnetic harvesters, RF Induction charging.

　　•Designs can use ultra low power by leveraging the Maximum Peak Power Tracking EnerChip EP capabilities

　　•The power management communications interface to the system MCU can be used to create “Energy Aware” systems

　　•Input power measurement and status reporting

　　•Advanced energy storage management

　　• Advanced energy storage management

　　• Uses digital power controls

　　The EnerChip EP uses an advanced Maximum Peak Power Tracking (MPPT) algorithm that constantly matches the EH transducer output impedance. MPPT is the most efficient method of converting energy from an EH transducer and is superior to charge accumulation techniques that do not match the impedance of the transducer to the power conversion stage. The EnerChip EP operates in multiple modes and can communicate with microcontrollers. The EP manages all aspects of energy storage devices/peripherals and uses intelligent power management during the start-up initialization sequence.

　　CBC915主要特性：

　　•Use any type of Energy Harvesting (EH) transducer: Light, Vibration, Thermal, RF, etc.

　　•Advanced Maximum Peak Power Tracking Algorithms for High Efficiency Energy Conversion

　　•EH Transducer to System Load Impedance Matching

　　•Communications Interface to System MCU

　　• Energy Status Indicators for Incoming Energy and Storage Energy Levels

　　•Charge Control for EnerChip CBC050 Thin Film Energy Storage Devices

　　•Built-in Energy Storage Protection

　　• Temperature Compensated Charge Control

　　•Adjustable Switchover Voltage

　　• Low Standby Power

　　• 38 pin TSSOP Package

　　• -20℃ to +70℃ Operating Range

　　• SMT - Lead-Free Reflow Tolerant

　　•RoHS Compliant

　　The key to designing energy harvesting-based wireless sensors with high efficiency power conversion is to utilize the EnerChip EP along with EnerChip rechargeable energy storage devices. The EnerChip EP performs the high efficiency energy conversion, energy storage and power management. It is the key enabler of “Zero Power” systems as shown in the following diagram:

　　CBC915 operation with a thermoelectric generator (TEG) transducer (as shown in Figure 3) starts with a temperature differential across the TEG. This temperature differential causes the TEG to generate a voltage. When that voltage reaches approximately 400mV, the input charge pump will start, boost the input voltage, and store the accumulated charge in capacitor Cin. When the accumulated charge voltage reaches approximately 2.4V, the charge will be dumped into the CBC915 power rail, activating the CBC915. Upon activation, the CBC915 outputs are initialized to a known state and the input mode pins will be interrogated in order to recognize the transducer type. The CBC915 will then pulse-width modulate the LX pin and initiate operation of the boost converter. When the boost converter voltage rises above 2.4V, power to the input charge pump is removed to reduce quiescent current. The CBC915 then checks for voltage on the output capacitor (Cout) by setting the EN VCAP pin high and reading the output capacitor voltage on VCAP pin. If the capacitor is charged, the CBC915 will leave the capacitor connected to the VOUT pin and EnerChips. If the capacitor has not been charged, the CBC915 will turn off the VOUT connection by setting EN VOUT/ pin high and isolate the capacitor from the EnerChips by setting EN CAP CHG/ pin high. The CBC915 will then check the boost converter voltage by monitoring the voltage at the VOUT pin and wait for the voltage to reach 4.06V at which time the CBC915 will enter the maximum peak power tracking state (MPPT) and pulse the MPPT/ status pin low and start adjusting the boost converter input impedance to match the output impedance of the TEG. This process can take several minutes. The MPPT state is only entered at initial power-on and values are subsequently stored.

　　图1。CBC915能量处理器应用电路

　　EnerChip™ EP通用能量收集评估套件CBC-EVAL-09

　　能量收集评估套件主要特性：

　　CBC-EVAL-09 is a universal energy harvesting (EH) evaluation kit that combines any one of multiple EH transducers with the EnerChipTM EP CBC915-ACA Energy Processor and the EnerChip CBC51100 100uAh solid state battery module that has two 50μAh EnerChip solid state batteries connected in parallel. The purpose of this evaluation platform is to enable designers to quickly develop Energy Harvesting applications.

　　图2。CBC-EVAL-09演示板外形图

　　图3。CBC-EVAL-09演示板方框图

　　图4。CBC-EVAL-09演示板电路图(1)

　　图5。CBC-EVAL-09演示板电路图(2)

　　CBC-EVAL-09主板材料清单：