Hybrid Repair Shop & Maintenance
This inverter unit controls the electrical power flows to and from the batteries, the electric motors, the generators and the AC air compressor for Hybrid air condition
The Toyota inverter unit contains 2 inverter circuits and a converter / voltage controller.
The power inverter converts the DC voltage of 201.6 volts to an alternating voltage of 500 volts for the electric motor. The small inverter provides the Hybrid AC compressor power supply for Prius air conditioning. The DC / DC converter takes care of the 12 Volt for the battery.
How does the Power converter / inverter look inside? To give you an idea, here are two pictures of the Prius 1 converter / inverter
The Hybrid Battery
The THS II Prius Hybrid battery is of nickel metal hydride type (NiMH).
This is a extremely powerful hybrid battery has a weight of almost 100 lbs
Toyota hybrid battery currently has the highest power density among hybrid batteries
The Prius HV battery consists of:
6 Cells per Module
168 Cells Total
1.2 Volts per Cell
201.6 Volts Total
6.5 A / H (3h)
The HV battery is placed on the bottom plate above the rear axle of Prius. The charging level of the HV battery is held by the computer system between 40% and 80%, which means that Toyota follows a car alarm. There is therefore a full factory warranty of 8 years.
The lifetime of the HV battery in the Prius has been tested in various ways by means of lifetime simulations, but in practice.
The HV battery has been tested at taxi companies in Japan, Sweden and Canada.
Toyota Prius Charging level indicator
In an intermediate phase, both electrical power can flow to the HV battery and to the electric motor for the drive.This process is regulated using a number of parameters, such as generated electrical energy (MG1), energy required for the HV battery (charge level), NiMh temperature and required electrical energy for the drive (MG2).
Prius 12 volts battery
The Toyota Prius has a 12V – 35 Amp / hr lead / cadmium Battery, this battery provides the power supply of the control, control and control systems.This battery is in the luggage compartment and is not just auxiliary battery but essential for the proper functioning of the Prius.
The auxiliary battery is charged from the HV battery via the converter. Loading starts when the hybrid system is started via the Powerbutton. The combustion engine does not need to be in operation for this purpose.
The Prius Inverters / Converter
Power Inverter The power inverter of the Prius is an electrical converter that converts the DC power of the HV battery and the AC voltage of MG1 and MG2. The inverter consists of two 3-phase bridge circuits, one for MG1 and one for MG2, each circuit consists of 6 power pulses and converts the DC power of the HV battery into a three phase AC voltage and the alternating AC voltage of MG1 and MG2 in a Direct voltage. The activation of the power transistors is controlled by the HV-ECU. This sends a control signal to the power transistors. In the inverter there are a number of sensors / sensors that send information about the supplied power, voltage level, temperature to the HV-ECU. The inverter in the Prius II is also equipped with a voltage amplifier circuit which increases the input voltage (201.6 volts) of the HV battery to an output voltage of up to 500 volts for MG2. The inverter controls the voltage level based on the power requested by the HV-ECU between 201.6 volts and 500 volts, thus keeping the current to MG2 equal. The inverter produces quite a lot of heat during these control operations, so that it must be cooled by a separate and internal cooling circuit together with MG1 and MG2.