Summary of Contents for microGen LTC3330
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Page 1: Evaluation Kit
Evaluation Kit User’s Guide got.energy@microgensystems.com 150 Lucius Gordon Drive, Suite 117 West Henrietta, NY 14586 (585) 214-2426... -
Page 2: Table Of Contents
Product Description......................3 Specifications ......................... 4 AC Power Cell ......................... 5 LTC3330 Power Management Board ................7 Torex LDO Power Management Board ................ 10 Connecting AC Power Cell to Power Management Boards ......... 11 Connecting two AC Power Cells ................... 12 Diagnostic Board ...................... -
Page 3: Product Description
AC Power Cell. The Power Management Boards provide up to 500µF storage capacitance for powering the application of interest. The LTC3330 Power Management Board is configurable to output between 1.8 and 5 Volts. The Torex LDO Power Management Board has a fixed 3.3 Volt output. -
Page 4: Specifications
3 - 19 Volts Output Voltage Range 1.8 – 5 Volts Storage Capacitance 500 µF For more information about the LTC3330, please consult the Linear Technologies LTC3330 datasheet. Torex LDO Power Management Board Operating Voltage Range 1.5 - 6 Volts Output Voltage 3.3 Volts... -
Page 5: Ac Power Cell
AC Power Cell Product Description The microGen AC Power Cell allows the user to more readily probe and connect to microGen’s AC Power Generator, our piezoelectric vibrational energy harvester. Simply mount the board to a vibration source and the device will generate AC power. Connect one of the supplied Power Management Boards and you are ready to generate DC power. - Page 6 The AC Power Cell board contains the AC Power Generator, located at the center of the board, and two 3-pin headers for connecting accessory boards (e.g. microGen’s Power Management Boards) on top of the AC Power Cell, or the user’s custom electronics. Also included on the board are configuration resistors that route the power signals, and loops for probe clips should the need arise to view the harvester voltage output.
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Page 7: Ltc3330 Power Management Board
The LTC3330 Power Management Board uses a low leakage single phase diode bridge to rectify an AC voltage. A Linear Technologies LTC3330 nanopower DC/DC converter is laid out in a buck configuration with a 22uH inductor. The switching converter allows for wide range on input Voltages and a configurable output between 1.8 and 5 Volts. - Page 8 How it Works The AC signal from the AC Power Cell is routed directly to the Linear Technology LTC3330 AC/DC converter component. The LTC3330 is highly configurable, allowing the user to adjust the output voltage as well as the voltage range where the device is allowed to harvest energy. The user has the option to use the onboard capacitance for power storage, or bypass the storage capacitors if all of the harvested energy is to be transferred off the PCB.
- Page 9 Configurations The output voltage of the LTC3330 Power Management Board is configurable by the user. Use the provided VOUT jumpers and Table 4 for proper configuration. Note that the LTC3330 only operates in DC/DC Buck Mode so the output voltage cannot equal to or greater than the user configured harvesting input voltage.
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Page 10: Torex Ldo Power Management Board
Torex LDO Power Management Board Product Description The Torex Power Management Board uses a low leakage single phase diode bridge to rectify an AC voltage into an LDO (low-dropout regulator). The Torex XC6215 is a low power consumption Voltage regulator that provides a fix 3.3 Volt output. The components chosen are designed to provide an efficient AC to DC conversion. -
Page 11: Connecting Ac Power Cell To Power Management Boards
Management Board must align with P1 on the AC Power Cell. Figures 5 and 6 show the correct orientation of the boards. Please note the microGen logo in each picture and how they align differently on the two Power Management Boards. -
Page 12: Connecting Two Ac Power Cells
Connecting Two AC Power Cells Both of the AC Power Cells included in the Evaluation Kit can be used in conjunction to increase the amount of energy harvested. This requires the user to modify one of the AC Power Cells to match the resistor configuration pictured in BOARD A. -
Page 13: Diagnostic Board
Diagnostic Board Product description The Diagnostic Board provides the user with several tools to analyze the current consumption of their device and current generated from the rectified output of the AC Power Cell. It contains a low power Current Sense Circuit based on a Texas Instruments INA326 Instrumentation Amplifier that enables measurement of current with low noise levels. -
Page 14: Board Overview
Diagnostic Board Overview Current Sense Circuit Supply Input Voltage (9VDC) 9V Battery Holder Device Input Power Terminal Block Oscilloscope Probe Clip Loops Rectified AC Power Cell DC Input Connector Device/Load Blinking LED Terminal Block Test Circuit Rectified Power Cell Figure 9: Diagnostic Board Overview DC Input Connector... - Page 15 Current Sense Circuit The Current Sense Circuit allows the user to connect a DC input (such as a battery, benchtop supply or the rectified output of the AC Power Cell + Power Management Board) and a load device through a low-side 10 Ω sense resistor (see Figure 10). Using an external oscilloscope, the user can view the amplified current signal.
- Page 16 Gain Jumper Configurations The Current Sense Circuit is able to measure current over a wide range (10 µA to 25 mA). However, the full range is binned into three groups to ensure complete coverage of the current sensing range. See Table for the gain jumper configurations. Note any configuration not show in Table 7 is invalid.
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Page 17: Connection Diagrams
Connection Diagrams Below are three common configurations to utilize the contents of the Evaluation Kit. Terminal block (P2) or Molex PicoBlade™ connector (P3) allow the user to connect an independent power supply (e.g. battery, bench-top supply) or the rectified output of the AC Power Cell as the input power source of the attached load or device as shown in Figure 11. - Page 18 DC Input (AC Power Cell + Power Management Board) Oscilloscope Load Figure 12: Measuring the Current Draw using the rectified output of the AC Power Cell microGen Power Cell Oscilloscope Figure 13: Using the Blinking LED Test Circuit as a Load...
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Page 19: Frequently Asked Questions
Ensure the g level of the vibration source is above the minimum to excite the AC Power Generator. For impulse mode of operation, this is highly dependent on the pulse width and maximum g level of the pulse. Please contact microGen Systems for further information. - Page 20 Q: The output voltage of my LTC3330 Power Management Board isn’t what I expected it to be, why? A: The LTC3330 is designed to allow the user to select the output voltage. Ensure the VOUT jumpers are properly configured. Please see the Linear Technology LTC3330 datasheet for more information about configuring the output voltage.
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Page 21: Appendix
Appendix Figure 14: Diagnostic Board Mechanical Dimensions Figure 15: Diagnostic Board Component layout... - Page 22 Figure 16: AC Power Cell Schematic Figure 17: AC Power Cell Mechanical Dimensions...
- Page 23 Figure 18: LTC3330 Power Management Board Schematic Figure 19: LTC3330 Power Management Board Mechanical Dimensions...
- Page 24 Figure 20: Torex Power Management Board Schematic Figure 21: Torex Power Management Board Mechanical Dimensions...
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