Voltage sequencing circuit for sequencing voltages to an electrical device
First Claim
1. A voltage sequencing circuit for sequencing the application of voltage levels to an electrical device, said circuit comprising:
- a first transistor switch connecting a first input terminal to a first output terminal,a first voltage source connected to said first input terminal,a second transistor switch having an input electrode, an output electrode and a control electrode, said input electrode being connected to a control electrode of said first switch,a delay circuit connected to the control electrode of said second switch, a second input terminal connected to the input of said delay circuit,a second voltage source connected to said second input terminal,a second output terminal connected to said second input terminal, whereby said first switch is conductive only when said second switch is conductive and said delay circuit prevents said second switch from conducting until a predetermined voltage from said second voltage source has been maintained at said second input terminal for a preselected time interval.
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Abstract
The present invention provides means for sequencing various supply voltages to electronic circuits and devices to thereby protect those circuits and devices from exposure to deleterious voltages. A first transistor switch connects a first voltage source to a first output terminal. A second transistor switch is connected to the control electrode of the first transistor switch. The second transistor switch, when conducting, causes the first transistor switch to conduct. The second transistor switch is turned on by a second voltage source which is connected through a delay circuit to the control electrode of the second transistor switch. The second voltage source also is connected through a diode and capacitor circuit to a second output terminal.
56 Citations
5 Claims
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1. A voltage sequencing circuit for sequencing the application of voltage levels to an electrical device, said circuit comprising:
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a first transistor switch connecting a first input terminal to a first output terminal, a first voltage source connected to said first input terminal, a second transistor switch having an input electrode, an output electrode and a control electrode, said input electrode being connected to a control electrode of said first switch, a delay circuit connected to the control electrode of said second switch, a second input terminal connected to the input of said delay circuit, a second voltage source connected to said second input terminal, a second output terminal connected to said second input terminal, whereby said first switch is conductive only when said second switch is conductive and said delay circuit prevents said second switch from conducting until a predetermined voltage from said second voltage source has been maintained at said second input terminal for a preselected time interval. - View Dependent Claims (2, 3, 4, 5)
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Specification