Back to results
US 6,617,828 B2Granted
Circuit assembly for doubling the voltage of a battery
AssigneeTexas Instruments Incorporated
InventorsUlrich Kaiser, Ralph Oberhuber
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTexas Instruments Incorporated
InventorsUlrich Kaiser, Ralph Oberhuber
Estimating the term…
A circuit assembly for doubling the voltage of a battery includes a charge pump (12) fed by the battery voltage and controlled by a clock generator (10). The supply voltage of the clock generator is the voltage output by the charge pump (12). The source/drain circuit of a field-effect transistor (P4) is inserted in the connection between the output of the charge pump (12) and the battery (26), the field-effect transistor (P4) being ON when its gate voltage is smaller than its source voltage. Connected to the gate of the field-effect transistor (P4) is the output circuit branch (N2) of a current mirror circuit (32) through which a limited small current is derivable from the gate to ground. An auxiliary charge pump (22) is provided which receives its supply voltage from the output of the charge pump (12) and which is likewise controlled by the clock generator (10). The voltage generated by the auxiliary charge pump (22) is placed on the gate of the field-effect transistor (P4) to switch it OFF.
A circuit assembly for doubling the voltage of a battery comprising a charge pump fed by battery voltage and controlled by a clock generator whose supply voltage is the voltage output by said charge pump (12), a source/drain circuit of a field-effect transistor (P4) being inserted in the connection between the output of said charge pump (12) and the battery (26), said field-effect transistor (P4) being ON when its gate voltage is smaller than its source voltage, an output circuit branch of a current mirror circuit (32) through which a limited small current is derivable from the gate to ground is connected to the gate of said field-effect transistor (P4) and an auxiliary charge pump (22) being provided which receives its supply voltage from the output of said charge pump (12) and which is likewise controlled by said clock generator (10), the voltage generated by said auxiliary charge pump (22) being applied to the gate of said field-effect transistor (P4).
A voltage doubler circuit for doubling a battery voltage comprising:
Dependencies are inferred from the claim text.