Battery management system with MOSFET boost system
First Claim
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1. A boost system for a removable battery configured to provide high current, the removable battery also having low internal impedance, for powering a device, comprising:
- a first rechargeable cell having a positive and a negative terminal;
a second rechargeable cell having a positive and a negative terminal connected in series with the first rechargeable cell;
a battery connector for connecting the battery to a charger or a device to be powered by the battery;
a main bus connecting the positive terminal of the first rechargeable cell with a positive connector of the battery connector and also connecting the negative terminal of the second rechargeable cell to a negative connector of the battery pack connector;
an n-channel MOSFET configured as a low impedance high current switch disposed between the positive connector of the battery connector and the positive terminal of the first rechargeable cell;
a boost converter configured to supply a boost voltage to a gate of the n-channel MOSFET;
a boost converter power supply for providing a first current to the boost converter to power the boost converter;
a second boost converter power supply for providing a second current to the boost converter, the second current being larger than the first current, the second boost converter power supply including a timer for providing current flow from the second boost converter power supply for a selected period of time, the second boost converter power supply includes a pull down resistor connected to an output of the first boost converter power supply.
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Abstract
A boost converter for driving the gate of n-channel MOSFET power devices is described. The boost converter includes a monitoring circuit and a kick start circuit to quickly bring the boost converter online when required to drive the MOSFET on.
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Citations
8 Claims
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1. A boost system for a removable battery configured to provide high current, the removable battery also having low internal impedance, for powering a device, comprising:
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a first rechargeable cell having a positive and a negative terminal; a second rechargeable cell having a positive and a negative terminal connected in series with the first rechargeable cell; a battery connector for connecting the battery to a charger or a device to be powered by the battery; a main bus connecting the positive terminal of the first rechargeable cell with a positive connector of the battery connector and also connecting the negative terminal of the second rechargeable cell to a negative connector of the battery pack connector; an n-channel MOSFET configured as a low impedance high current switch disposed between the positive connector of the battery connector and the positive terminal of the first rechargeable cell; a boost converter configured to supply a boost voltage to a gate of the n-channel MOSFET; a boost converter power supply for providing a first current to the boost converter to power the boost converter; a second boost converter power supply for providing a second current to the boost converter, the second current being larger than the first current, the second boost converter power supply including a timer for providing current flow from the second boost converter power supply for a selected period of time, the second boost converter power supply includes a pull down resistor connected to an output of the first boost converter power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification