Injector driving circuit

An injector driving circuit comprising:

• a power supply voltage terminal and a reference voltage terminal;
• a plurality of first diode circuits coupled between respective one ends of solenoid coils of a plurality of injectors to be driven and said power supply voltage terminal to supply said one ends of said solenoid coils with a power supply voltage applied to said power supply voltage terminal;
• a plurality of first switching means coupled between the respective other ends of said solenoid coils and said reference voltage terminal to control the current conducting state of said solenoid coils in accordance with a driving input signal;
• a plurality of current detecting means each producing an output signal when detecting that current flowing through its corresponding one of said plurality of solenoid coils has reached a predetermined value;
• charge storing means with one end coupled to said reference voltage terminal;
• a plurality of second switching means respectively coupled between said one ends of said solenoid coils and the other end of said charge storing means and connected to be turned on and off in response to the driving input signal and the output signals from said current detecting means, respectively;
• and
• a plurality of second diode circuits respectively coupled between said other ends of said solenoid coils and said other end of said charge storing means to allow current to flow from said solenoid coil to said charge storing means.