NMOS reverse battery protection
First Claim
1. A reverse polarity protected system for a voltage source that includes positive and negative terminals, comprising:
- a polarity-sensitive device that has a first terminal that communicates with the positive terminal of the voltage source, and that includes a second terminal;
a low-resistance switch that has a first terminal that communicates with the positive terminal of the voltage source, a second terminal that communicates with the negative terminal of the voltage source, and a third terminal that communicates with said second terminal of said polarity-sensitive device,wherein said low-resistance switch assumes a conducting state between its second and third terminals when a first voltage at the positive terminal of the voltage source minus a second voltage at the negative terminal of the voltage source is greater than a first threshold voltage, and wherein said low-resistance switch assumes a non-conducting state between its second and third terminals when said first voltage minus said second voltage is less than a second threshold voltage; and
a drive circuit having first and second terminals, wherein said first terminal of said drive circuit communicates with a control terminal of said polarity-sensitive device, and said second terminal of said drive circuit communicates with said second terminal of said polarity-sensitive device.
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Accused Products
Abstract
A reverse polarity protected system comprises a voltage source that includes positive and negative terminals. A polarity-sensitive device has a first terminal that communicates with the positive terminal of the voltage source, and that includes a second terminal. A low-resistance switch communicates with the first and second terminals of the voltage source, and communicates with the second terminal of the polarity-sensitive device. The low-resistance switch assumes a conducting state between the second terminal of the polarity-sensitive device and the negative terminal of the voltage source when a first voltage at the positive terminal of the voltage source minus a second voltage at the negative terminal of the voltage source is greater than a threshold voltage. Otherwise, the low-resistance switch assumes a non-conducting state.
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Citations
15 Claims
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1. A reverse polarity protected system for a voltage source that includes positive and negative terminals, comprising:
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a polarity-sensitive device that has a first terminal that communicates with the positive terminal of the voltage source, and that includes a second terminal; a low-resistance switch that has a first terminal that communicates with the positive terminal of the voltage source, a second terminal that communicates with the negative terminal of the voltage source, and a third terminal that communicates with said second terminal of said polarity-sensitive device, wherein said low-resistance switch assumes a conducting state between its second and third terminals when a first voltage at the positive terminal of the voltage source minus a second voltage at the negative terminal of the voltage source is greater than a first threshold voltage, and wherein said low-resistance switch assumes a non-conducting state between its second and third terminals when said first voltage minus said second voltage is less than a second threshold voltage; and a drive circuit having first and second terminals, wherein said first terminal of said drive circuit communicates with a control terminal of said polarity-sensitive device, and said second terminal of said drive circuit communicates with said second terminal of said polarity-sensitive device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification