Family of current/power-efficient high voltage linear regulator circuit architectures
First Claim
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1. A voltage regulator circuit, comprising:
- a first circuit configured to receive a first bias current and generate a first output voltage;
a second circuit configured to receive the first output voltage and a second bias current, and to supply an output current at a regulated output voltage based on the first output voltage and the second bias current; and
a generator configured to generate at least one of the first and second bias currents,wherein the generator is configured to at least one of;
receive the first output voltage to generate the first bias current, andindependent of the first circuit, generate the second bias current based on the regulated output voltage.
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Abstract
Power efficient power supply regulator circuits are disclosed. The circuits are configured to modify their overhead current according to current load. This is particularly advantageous for use in display devices with widely varying current loads. Such displays include bi-stable displays, such as interferometric modulation displays, LCD displays, and DMD displays.
27 Citations
30 Claims
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1. A voltage regulator circuit, comprising:
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a first circuit configured to receive a first bias current and generate a first output voltage; a second circuit configured to receive the first output voltage and a second bias current, and to supply an output current at a regulated output voltage based on the first output voltage and the second bias current; and a generator configured to generate at least one of the first and second bias currents, wherein the generator is configured to at least one of; receive the first output voltage to generate the first bias current, and independent of the first circuit, generate the second bias current based on the regulated output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a bias current in a circuit of a voltage regulator, the voltage regulator configured to provide current substantially at a regulated output voltage, wherein the voltage regulator comprises a first circuit receiving a first bias current and generating a first output voltage, and a second circuit receiving the first output voltage and a controlled bias current and generating the regulated output voltage based on the first output voltage and the controlled bias current, the method comprising:
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sensing a difference between a voltage based on the output voltage and a reference voltage; and independent of the first circuit, generating the controlled bias current based on the difference. - View Dependent Claims (11, 12, 13)
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14. A voltage regulator circuit, comprising:
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a first circuit configured to receive a first bias current and to generate a first output voltage; and a second circuit configured to receive the first output voltage and a second bias current, and to supply an output current at a regulated output voltage based on the first output voltage and the second bias current; and a generator configured to generate at least one of the first and second bias currents, wherein the generator is configured to at least one of; receive the first output voltage to generate the first bias current, and independent of the first circuit, generate the second bias current based on a difference between a voltage based on the regulated output voltage and a reference voltage. - View Dependent Claims (15, 16, 17, 18)
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19. A display comprising:
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a plurality of bi-stable display elements; and a voltage regulator circuit, the voltage regulator circuit comprising; a first circuit configured to receive an input bias current and generate a first output voltage; a second circuit configured to receive the first output voltage and an output bias current, and to supply an output current at a regulated output voltage based on the first output voltage and the second bias current; and a generator configured to generate at least one of the first and second bias currents, wherein the generator is configured to at least one of; receive the first output voltage to generate the first bias current, and independent of the first circuit, generate the output bias current based on the regulated output voltage. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A voltage regulator circuit configured to supply an output current at a regulated output voltage, the voltage regulator circuit comprising:
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first means for sensing a difference between a voltage based on the regulated output voltage and a reference voltage, the first sensing means configured to receive a bias current and to generate a first output voltage based on the bias current and the sensed difference; means for generating the output current based on the difference sensed by the first sensing means; and means for generating the bias current based on the first output voltage. - View Dependent Claims (27, 28, 29, 30)
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Specification