Wireless Charger Circuit NiMH Battery

Charging Electronic Devices Wirelessly becomes Normal now a days, Why we charging mobile phones only. Lets charge every electronic device wirelessly. Here Wireless Charger Circuit NiMH Battery designed to charge 25mA tiny NiMH Battery by using two standalone ICs LTC6990 and LTC4123. This circuit with PCB mentioned here is a Test Circuit and suitable for Experiment only and not for real applications. Here Charging transmitter and Receiver coils are mentioned as Inductors, Use proper transmitter and Receiver Coils.




IC LTC6990 from analog is a precision silicon oscillator with a Programmable frequency range of 488Hz to 2MHz. It can be used as a fixed frequency oscillator or voltage controlled oscillator. Here a single Resistor Rset programs the LTC6990s internal master oscillator frequency. Refer datasheet for more information.

Wireless Charger Transmitter Circuit Diagram

Components Required (BOM)

1C14.7µFC_0805_2012Metric1
2C2100µFC_0805_2012Metric1
3R1205KR_0805_2012Metric1
4U1LTC6990HDCBTRPBFDFN-6-1EP_3x3mm_P0.95mm_EP1.7×2.6mm1
5CTX133nFC_0805_2012Metric1
6CTX21nFC_0805_2012Metric1
7LTX17.5µHL_Axial_L7.0mm_D3.3mm_P12.70mm_Horizontal_Fastron_MICC1
8Q1Si2312CDSSOT-231
9J1Screw_Terminal_01x02JWT_A3963_1x02_P3.96mm_Vertical1

Printed Circuit Board (PCB)

Wireless Charger Transmitter Circuit PCB Gerber files.

Interactive Board Viewer

     

Wireless Charger Receiver Circuit Diagram

Components Required (BOM)

1D1LEDLED_0805_2012Metric1
2U1LTC4123DFN-6-1EP_2x2mm_P0.65mm_EP1x1.6mm1
3CIN14.7µFC_0805_2012Metric1
4CRX133nFC_0805_2012Metric1
5LRX113µHL_Wuerth_WE-PD-Typ-LS_Handsoldering1
6RPROG1953ΩR_0805_2012Metric1
7J1Screw_Terminal_01x02JWT_A3963_1x02_P3.96mm_Vertical1

Printed Circuit Board (PCB)

Wireless Charger Receiver Circuit PCB Gerber Files.

Construction & Working

IC LTC4123 from analog is a low power Wireless Receiver and constant current / Constant Voltage linear charger for NiMH batteries. An external programming Resistor sets the charge current up to 25mA.

The LTC4123 is a low power battery charger designed to wirelessly charge single cell NiMH batteries. Magnetic field to the Receiver coil induce EMF and this Rectified by the internal Rectification and input power control block. Another logic control block decides the charging current output. Constant current and constant voltage block Regulates the supply and allows to BAT pin. This IC comes in a tiny package and hence suitable for tiny device designs. Refer datasheet for more information.




Leave a Reply

Your email address will not be published. Required fields are marked *