Wide Input Voltage Range Power Supply Circuit
AssigneeRockwell Automation Technologies, Inc.
InventorMichael Gasperi
Life of this patent
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Abstract
An under voltage lockout circuit configured to set a minimum turn-on voltage for a load is provided. The circuit includes an input terminal configured to receive an input voltage. The circuit includes a first transistor configured to become conductive to supply the input voltage to the load when an input voltage to the under voltage lockout circuit exceeds a threshold, and a second transistor coupled to the first transistor, the second transistor configured to become conductive to supply the input voltage to a first resistor and not to the load when an input voltage to the under voltage lockout circuit falls below the threshold.
Claims20
A wide input voltage power supply circuit for a load, the circuit comprising:
- a first stage comprising a linear regulator circuit configured to maintain an output voltage at a predetermined output voltage level, the linear regulator including an input for shutting the linear regulator off when an input voltage exceeds a predetermined shut off threshold;
- and
- a second stage comprising an under voltage lockout circuit coupled to an output of the linear regulator, the under voltage lockout circuit configured to set a minimum turn-on voltage for the load and including:
- a first transistor configured to become conductive to supply the input voltage to the load and not to a first resistor when an input voltage to the under voltage lockout circuit exceeds a threshold, and
- a second transistor coupled to the first transistor, the second transistor configured to become conductive to supply the input voltage to the first resistor and not to the load when an input voltage to the under voltage lockout circuit falls below a threshold.
An under voltage lockout circuit configured to set a minimum turn-on voltage for a load, comprising:
- an input terminal configured to receive an input voltage;
- a first transistor configured to become conductive to supply the input voltage to the load when an input voltage to the under voltage lockout circuit exceeds a threshold;
- and
- a second transistor coupled to the first transistor, the second transistor configured to become conductive to supply the input voltage to a first resistor and not to the load when an input voltage to the under voltage lockout circuit falls below the threshold.
An under voltage lockout circuit configured to set a minimum turn-on voltage for a load, comprising:
- an input terminal configured to receive an input voltage;
- a voltage divider connected to the input voltage, the voltage divider including a first and second resistor;
- a first transistor, a base of the first transistor being connected to the voltage divider, the first transistor being configured to become conductive to supply the input voltage to the load when an input voltage to the voltage divider exceeds a threshold;
- a second transistor coupled to the first transistor;
- and
- a third resistor connected between the input terminal and a collector of the second transistor, the second transistor configured to become conductive to supply the input voltage to the third resistor and not to the load when an input voltage to the voltage divider falls below the threshold.
Dependencies are inferred from the claim text.