Voltage regulation circuits and power supply devices using the same
First Claim
1. A voltage regulation circuit for regulating a level of a supply voltage provided by an automotive battery, the voltage regulation circuit comprising:
- a selector receiving a plurality of predetermined voltages and selecting one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage;
an error amplifier generating an error signal according to the first reference voltage and a divided voltage signal;
a voltage divider, receiving a feedback signal and performing a voltage division operation to the feedback signal to generate the divided voltage signal; and
a buffer coupled between the voltage divider and the error amplifier and buffering the divided voltage signal to the error amplifier, wherein the buffer comprises a unity gain buffer amplifier,wherein the feedback signal is related to the supply voltage,wherein the plurality of predetermined voltages comprises at least a first predetermined voltage and a second predetermined voltage, and each of the first predetermined voltage and the second predetermined voltage is independent of the level of the supply voltage,wherein the voltage regulation circuit regulates the level of the supply voltage according to the error signal.
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Accused Products
Abstract
A voltage regulation circuit is provided. The voltage regulation circuit regulates a level of a supply voltage provided by an automotive battery. The voltage regulation circuit includes a selector and an error amplifier. The selector receives a plurality of predetermined voltages and selects one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage. The error amplifier generates an error signal according to the first reference voltage and a feedback signal. The feedback signal is related to the supply voltage. The voltage regulation circuit regulates the level of the supply voltage according to the error signal.
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Citations
19 Claims
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1. A voltage regulation circuit for regulating a level of a supply voltage provided by an automotive battery, the voltage regulation circuit comprising:
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a selector receiving a plurality of predetermined voltages and selecting one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage; an error amplifier generating an error signal according to the first reference voltage and a divided voltage signal; a voltage divider, receiving a feedback signal and performing a voltage division operation to the feedback signal to generate the divided voltage signal; and a buffer coupled between the voltage divider and the error amplifier and buffering the divided voltage signal to the error amplifier, wherein the buffer comprises a unity gain buffer amplifier, wherein the feedback signal is related to the supply voltage, wherein the plurality of predetermined voltages comprises at least a first predetermined voltage and a second predetermined voltage, and each of the first predetermined voltage and the second predetermined voltage is independent of the level of the supply voltage, wherein the voltage regulation circuit regulates the level of the supply voltage according to the error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power supply device for an automobile comprising:
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an automotive battery, providing a supply voltage; and a voltage regulation circuit regulating a level of the supply voltage, wherein the voltage regulation circuit comprises; a selector, receiving a plurality of predetermined voltages and selecting one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage; an error amplifier, generating an error signal according to the first reference voltage and a divided voltage signal; a voltage divider, receiving a feedback signal and performing a voltage division operation to the feedback signal to generate the divided voltage signal; and a buffer coupled between the voltage divider and the error amplifier and buffering the divided voltage signal to the error amplifier, wherein the buffer comprises a unity gain buffer amplifier, wherein the feedback signal is related to the supply voltage, wherein the plurality of predetermined voltages comprises at least a first predetermined voltage and a second predetermined voltage, and each of the first predetermined voltage and the second predetermined voltage is independent of the level of the supply voltage, and wherein the voltage regulation circuit regulates the level of the supply voltage according to the error signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A voltage regulation circuit for regulating a level of a supply voltage provided by an automotive battery, the voltage regulation circuit comprising:
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an error amplifier generating an error signal according to a first reference voltage and a divided voltage signal that is generated based on a feedback signal, wherein the first reference voltage is at a first voltage level during a first regulation period and at a second voltage level during a second regulation period; a comparator receiving the error signal and a second reference voltage; and a driver connected directly to the output of the comparator, the driver regulating the level of the supply voltage according to the error signal, wherein the driver comprises a level shifter, a switching element, and a transformer, and wherein the feedback signal is related to the supply voltage.
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18. A power supply device for an automobile comprising:
- an automotive battery providing a supply voltage; and
a voltage regulation circuit regulating a level of the supply voltage, wherein the voltage regulation circuit comprises; an error amplifier generating an error signal according to a first reference voltage and a divided voltage signal that is generated based on a feedback signal, wherein the first reference voltage is at a first voltage level during a first regulation period and at a second voltage level during a second regulation period; a comparator receiving the error signal and a second reference voltage; and a driver connected directly to the output of the comparator, the driver regulating the level of the supply voltage according to the error signal, wherein the driver comprises a level shifter, a switching element, and a transformer;
wherein the feedback signal is related to the supply voltage.
- an automotive battery providing a supply voltage; and
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19. A voltage regulation circuit for regulating a level of a supply voltage provided by an automotive battery, the voltage regulation circuit comprising:
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a selector receiving a plurality of predetermined voltages and selecting one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage; an error amplifier generating an error signal according to the first reference voltage and a divided voltage signal; a voltage divider, receiving a feedback signal and performing a voltage division operation to the feedback signal to generate the divided voltage signal; and a buffer coupled between the voltage divider and the error amplifier and buffering the divided voltage signal to the error amplifier, wherein the buffer comprises a unity gain buffer amplifier having a negative input terminal directly connected to an output of the unity gain buffer amplifier, wherein the feedback signal is related to the supply voltage, wherein the plurality of predetermined voltages comprises at least a first predetermined voltage and a second predetermined voltage, and each of the first predetermined voltage and the second predetermined voltage is independent of the level of the supply voltage, wherein the voltage regulation circuit regulates the level of the supply voltage according to the error signal.
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Specification