Drive overload protection circuit
First Claim
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1. A switching driver device overload protection circuit, comprising:
- drive means for controlling current through the device to a load, means for detecting load current and for producing an overload signal when the load current reaches a threshold; and
a relaxation oscillator for limiting said current through the device in response to said overload signal.
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Abstract
A controller for a starter/generator used with an aircraft engine, includes means for monitoring field return current in a generator field winding; means for monitoring generator voltage; and microprocessor control means for adjusting generator field current as a function of the field current and voltage and field return current. The field return current and output voltage monitoring functions allow for open field, field integrity, over voltage, field weakening and torque limiting functions to be realized in an integrated programmable system configuration.
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Citations
18 Claims
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1. A switching driver device overload protection circuit, comprising:
- drive means for controlling current through the device to a load, means for detecting load current and for producing an overload signal when the load current reaches a threshold; and
a relaxation oscillator for limiting said current through the device in response to said overload signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- drive means for controlling current through the device to a load, means for detecting load current and for producing an overload signal when the load current reaches a threshold; and
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12. A switching driver device overload protection circuit, comprising:
- drive means for controlling current through the device to a load by applying a pulse width modulated (PWM) control signal to the device, and a current limiting circuit for limiting said current through the device in response to increasing load by disabling said PWM signal.
- View Dependent Claims (13, 14, 15, 16, 17)
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18. A switching driver device overload protection circuit, comprising:
- drive means for controlling current through the device to a load, detector means for detecting load current and producing an overload signal when the load current reaches a threshold, and a current limiting circuit for limiting current through the device in response to increasing load by disabling said drive means.
Specification