July 16th, 2008

NiCd Advanced Charger HV

This charger has the same hardware of the Advanced Charger but can charge/discharge up to 19 cells. The advanced charger HV is based on a hardware pratically identical to the non HV version: for this all the material (from the schematics to the PCB) can be dowloaded from the Advanced Charger version. Some of the features of the HV advanced charger are:

  • Power supply with a 24V source (Current equal to maximum charge current).
  • Change the R6 with 12 KOhm, 1% value.
  • Heat sink the 7805 regulator.
  • Change the fan cooler with a 24V model.
  • Reprogram the PIC with the newch_HV.HEX file (see “files” section).
  • Start the charge/discharge of your 14-cells pack!!!.

NiCd Advanced Charger HV: [Link]

July 16th, 2008

NiCd Advanced Charger

This charger is a more complex one than the others available over the internet, and among its features are:

  • All the parameters for charge and discharge can be entered directly in the charger.
  • The PC is useful only for PIC firmware patch and for output graphic plotting.
  • A second P-channel mosfet is added for up to 10A charge current or for no self-powering diode.
  • Integrates a 162 lines LCD display
  • Integrates up to 7 different charge/discharge profiles
  • The batteries can be charged,discharged or cycled (charge after discharge)
  • Parameters for each battery profile:
    • Number of cells (from 1 o 7)
    • Cell capacity (useful for automatic timeout calculation)
    • Cut-off voltage per cell
    • Delta peak per cell
    • Charge current (up to 10A or 5A plus the diode)
    • Discharge current (up to 30A)
    • Peak control inhibition
    • Timeout in function of the cell capacity.
  • Support for costant voltage supply (motor test) with adjustable output
  • Fast current control (200Hz) and low noise values (1mV resolution for batteries)
  • Display during charge of current,voltage,peak voltage,delta peak, capacity, time
  • Display during discharge of current,voltage,peak voltage,cut-off, capacity, time
  • Acoustic buzzer for end of operation signaling
  • Automatic recovery in case of power supply failure

NiCd Advanced Charger: [Link]

USB AA NiMH and NiCd Battery Charger

Any USB port can supply 5V at up to 500mA. The USB standard specifies that a device may not use more than 100mA until it has negotiated the right to use 500mA, but apparently no USB ports enforce that requirement. This makes the USB port a convenient source of power for devices such as this charger.

USB AA NiMH and NiCd Battery Charger: [Link]

Rapid NiMH / NiCd Battery charger case

The following project could prove very useful for those of you who are into robotics, because as you may know robotics uses lots of batteries and needs to charge them fast, so the bots can be up&running again. The authors states that this battery charger charges a NIMH 5-pack battery used in the BiPed robot in less than 1 hour, and charges the 10-pack NiCd used in the Snuf robot in about 30 minutes which i think is more than ok for a DIY project.

To prevent overheating of the battery, the charging current is turned off when the slope of the battery-voltage turns from positive into negative. A second termination-criterion of the charging process is provided for safety: the charge time is limited to about 1 hour.

Rapid NiMH / NiCd Battery charger: [Link]

Efficient NiCd/NiMH Battery Charger

As you may have noticed commercial NiCd/NiMH battery charger’s are not that efficient when it comes to charging time. There might be some expensive models but we are not referring to that.  So Peter Hayles, the author of this project decided to build its own efficient NiCd/NiMH battery charger. He says that with the DIY charger he managed to cut the charging time from 4 hours to 1.5 hours max. This sound good to me.

Efficient NiCd/NiMH Battery Charger : [Link]

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