Direct current power control circuit

A direct current electric motor control circuit for the efficient discharge of a direct current power source through a direct current power drain in a manner that allows for longer power source life and longer time between power source recharging since power is drawn only as needed without large amounts of wasted power dissipation through resistors as heat, comprising:

• an input connection to an external input control variable resistance circuit;
• a pull up resistor and a zener diode arranged so as to translate a variable resistance at said input connection into a correspondingly variable voltage level at said input connection;
• a filter circuit comprising a resistor and a resistor/diode pair in parallel connection to each other and in series connection to said input connection, and a capacitor in series connection with said resistor and said resistor/diode pair and with a circuit high voltage;
• a solid state operational amplifier circuit having a positive input, a negative input, and an output, and arranged in series connection with said filter circuit, said positive input of said operational amplifier being in series connection with said filter circuit, said operational amplifier having a gain resistor in series connection to a ground, said operational amplifier further having a stabilizing feedback resistor connecting said output to said negative input of said operational amplifier, said operational amplifier further having an output filtering capacitor in series connection to a ground;
• a triangular waveform generator circuit comprising a first and a second operational amplifier device, said first and second operational amplifier devices each having a positive input, a negative input, and an output, said first operational amplifier device being configured in a non-inverting condition and said second operational amplifier device being in an inverting condition, said output of said first operational amplifier device being in connection with said negative input of said second operational amplifier device, said negative input of said first operational amplifier device being in connection with said positive input of said second operational amplifier device and being further held at a biasing voltage by a first and a second biasing resistor, said second operational amplifier device further having a first capacitor connected across said positive and said negative inputs of said second operational amplifier device and a second capacitor connected from said output of said second amplifier device to a common ground;
• a comparator circuit comprising a solid state comparator, said comparator device having a positive input, a negative input, and an output, said negative input being arranged for connection to said triangular waveform generator circuit, said positive input being arranged for connection to solid state operational amplifier circuit, said comparator device further having a pullup resistor and a feedback resistor at said output of said comparator device;
• an inverting MOSFET driver circuit comprising a solid state MOSFET driver device, said driver device having an input and an output, said input of said driver device being arranged for connection to said comparator circuit;
• at least one MOSFET circuit comprising a power MOSFET device and a resistor, said resistor being arranged for connection to said driver circuit, said MOSFET device having a gate connection, said gate connection being arranged for connection to said resistor, said MOSFET device having a source connection, said source connection being arranged for connection to an external power drain circuit, said MOSFET device having a drain connection, said drain connection being arranged for connection to a current source ground;
• a resistor/capacitor pair connected in series, said resistor/capacitor pair being arranged for connection across said MOSFET circuit;
• and
• a freewheeling diode being arranged for connection across said external power drain circuit.