Power supply circuit comprising detection circuit including reference voltage circuits as reference voltage generation circuits
First Claim
Patent Images
1. A power supply circuit comprising:
- a control circuit comprising;
a detection circuit including a first reference voltage generation circuit, a second reference voltage generation circuit, and an input signal adjustment circuit;
an error amplifier circuit;
a pulse width modulation driver;
a triangle-wave generation circuit; and
a capacitor,an amplifier circuit electrically connected to the control circuit that outputs an output voltage; and
a divider circuit that is electrically connected to the control circuit and the amplifier circuit and inputs a voltage obtained by dividing the output voltage as a feedback voltage to the second reference voltage generation circuit,wherein the input signal adjustment circuit comprises a first operational amplifier having a first non-inverting input terminal electrically connected to a first resistor and a second resistor and a first inverting input terminal electrically connected to a third resistor and a fourth resistor, andwherein the first reference voltage generation circuit comprises a second operational amplifier having a second non-inverting input terminal electrically connected to a fifth resistor and a first diode and a second inverting input terminal electrically connected to a sixth resistor, the sixth resistor is electrically connected to a second diode, and the first diode and the second diode are applied with a power source voltage, andwherein the second reference voltage generation circuit comprises a third operational amplifier having a third non-inverting input terminal electrically connected to a seventh resistor and a third diode and a third inverting input terminal electrically connected to an eighth resistor, the eighth resistor is electrically connected to a fourth diode, and the third diode and the fourth diode are applied with the feedback voltage.
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Abstract
It is an object to obtain a detection circuit for detecting feedback voltage without variation in output voltage/current or in output voltage by the operation temperature, and a power supply circuit including thereof. A power supply circuit includes a detection circuit, an amplifier circuit outputting an output voltage, a control circuit, and a divider circuit. The detection circuit includes first and second reference voltage generation circuits and an input signal adjustment circuit. The control circuit is electrically connected to the amplifier circuit and includes the detection circuit, an error amplifier circuit, a pulse width modulation driver, a triangle-wave generation circuit, and a capacitor. The divider circuit is electrically connected to the amplifier circuit and the control circuit and inputs a voltage obtained by dividing the output voltage to the second reference voltage generation circuit. Note that the first and second reference voltage generation circuits are each a reference voltage circuit.
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Citations
20 Claims
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1. A power supply circuit comprising:
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a control circuit comprising; a detection circuit including a first reference voltage generation circuit, a second reference voltage generation circuit, and an input signal adjustment circuit; an error amplifier circuit; a pulse width modulation driver; a triangle-wave generation circuit; and a capacitor, an amplifier circuit electrically connected to the control circuit that outputs an output voltage; and a divider circuit that is electrically connected to the control circuit and the amplifier circuit and inputs a voltage obtained by dividing the output voltage as a feedback voltage to the second reference voltage generation circuit, wherein the input signal adjustment circuit comprises a first operational amplifier having a first non-inverting input terminal electrically connected to a first resistor and a second resistor and a first inverting input terminal electrically connected to a third resistor and a fourth resistor, and wherein the first reference voltage generation circuit comprises a second operational amplifier having a second non-inverting input terminal electrically connected to a fifth resistor and a first diode and a second inverting input terminal electrically connected to a sixth resistor, the sixth resistor is electrically connected to a second diode, and the first diode and the second diode are applied with a power source voltage, and wherein the second reference voltage generation circuit comprises a third operational amplifier having a third non-inverting input terminal electrically connected to a seventh resistor and a third diode and a third inverting input terminal electrically connected to an eighth resistor, the eighth resistor is electrically connected to a fourth diode, and the third diode and the fourth diode are applied with the feedback voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A power supply circuit comprising:
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a control circuit comprising; a detection circuit including a first reference voltage generation circuit, a second reference voltage generation circuit, and an input signal adjustment circuit; an error amplifier circuit; a pulse width modulation driver; a triangle-wave generation circuit; and a capacitor, an amplifier circuit electrically connected to the control circuit that outputs an output voltage; and a divider circuit that is electrically connected to the control circuit and the amplifier circuit and inputs a voltage obtained by dividing the output voltage as a feedback voltage to the second reference voltage generation circuit, wherein the input signal adjustment circuit comprises a first operational amplifier having a first non-inverting input terminal electrically connected to a first resistor and a second resistor and a first inverting input terminal electrically connected to a third resistor and a fourth resistor, and each of the first resistor and the third resistor has a first resistance value and each of the second resistor and the fourth resistor has a second resistance value, and wherein the first reference voltage generation circuit comprises a second operational amplifier having a second non-inverting input terminal electrically connected to a fifth resistor and a first diode and a second inverting input terminal electrically connected to a sixth resistor, the sixth resistor is electrically connected to a second diode, and the first diode and the second diode are applied with a power source voltage, and wherein the second reference voltage generation circuit comprises a third operational amplifier having a third non-inverting input terminal electrically connected to a seventh resistor and a third diode and a third inverting input terminal electrically connected to an eighth resistor, the eighth resistor is electrically connected to a fourth diode, and the third diode and the fourth diode are applied with the feedback voltage. - View Dependent Claims (7, 8, 9, 10)
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11. A power supply circuit comprising:
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a control circuit comprising; a detection circuit including a first reference voltage generation circuit, a second reference voltage generation circuit, and an input signal adjustment circuit; an error amplifier circuit; a pulse width modulation driver; a triangle-wave generation circuit; and a capacitor, an amplifier circuit electrically connected to the control circuit that outputs a first output voltage; a divider circuit that is electrically connected to the control circuit and the amplifier circuit and inputs a voltage obtained by dividing the first output voltage as a feedback voltage to the second reference voltage generation circuit; and a voltage follower provided between the divider circuit and the second reference voltage generation circuit, wherein the input signal adjustment circuit comprises a first operational amplifier having a first non-inverting input terminal electrically connected to a first resistor and a second resistor and a first inverting input terminal electrically connected to a third resistor and a fourth resistor, and wherein the first reference voltage generation circuit comprises a second operational amplifier having a second non-inverting input terminal electrically connected to a fifth resistor and a first diode and a second inverting input terminal electrically connected to a sixth resistor, the sixth resistor is electrically connected to a second diode, and the first diode and the second diode are applied with a power source voltage, and wherein the second reference voltage generation circuit comprises a third operational amplifier having a third non-inverting input terminal electrically connected to a seventh resistor and a third diode and a third inverting input terminal electrically connected to an eighth resistor, the eighth resistor is electrically connected to a fourth diode, and the third diode and the fourth diode are applied with a second output voltage of the voltage follower. - View Dependent Claims (12, 13, 14, 15)
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16. A power supply circuit comprising:
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a control circuit comprising; a detection circuit including a first reference voltage generation circuit, a second reference voltage generation circuit, and an input signal adjustment circuit; an error amplifier circuit; a pulse width modulation driver; a triangle-wave generation circuit; and a capacitor, an amplifier circuit electrically connected to the control circuit that outputs a first output voltage; a divider circuit that is electrically connected to the control circuit and the amplifier circuit and inputs a voltage obtained by dividing the first output voltage as a feedback voltage to the second reference voltage generation circuit; and a voltage follower provided between the divider circuit and the second reference voltage generation circuit, wherein the input signal adjustment circuit comprises a first operational amplifier having a first non-inverting input terminal electrically connected to a first resistor and a second resistor and a first inverting input terminal electrically connected to a third resistor and a fourth resistor, and each of the first resistor and the third resistor has a first resistance value and each of the second resistor and the fourth resistor has a second resistance value, and wherein the first reference voltage generation circuit comprises a second operational amplifier having a second non-inverting input terminal electrically connected to a fifth resistor and a first diode and a second inverting input terminal electrically connected to a sixth resistor, the sixth resistor is electrically connected to a second diode, and the first diode and the second diode are applied with a power source voltage, and wherein the second reference voltage generation circuit comprises a third operational amplifier having a third non-inverting input terminal electrically connected to a seventh resistor and a third diode and a third inverting input terminal electrically connected to an eighth resistor, the eighth resistor is electrically connected to a fourth diode, and the third diode and the fourth diode are applied with a second output voltage of the voltage follower. - View Dependent Claims (17, 18, 19, 20)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsIto, Yoshiaki
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Primary Examiner(s)Zhang, Jue
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Assistant Examiner(s)Torres-Rivera, Alex
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Application NumberUS13/213,683Publication NumberTime in Patent Office977 DaysField of Search323/265, 323/282, 323/284, 323/285, 323/288, 323/351, 323/283, 323/312, 323/313US Class Current323/284CPC Class CodesH02M 1/0025 Arrangements for modifying ...H02M 3/155 using semiconductor devices...
