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US 12,658,688 B2Granted
Power supply circuit, working method of power supply circuit, and lighting device
AssigneeAputure Imaging Industries Co., Ltd.
InventorsYi Huang, Xiangjun Zhou, Yi Xie, Kun Tong
Life of this patent
Estimating the term…
Abstract
A power source circuit includes a first power source subcircuit. The first power source subcircuit includes a first overvoltage protection circuit, a first undervoltage protection circuit, a first drive circuit, and a first switching circuit. A cascade output result of the first over-voltage protection circuit and the first undervoltage protection circuit is used to control the first switching circuit for on-off control of the first power source subcircuit.
Claims16
A power supply circuit, comprising one or more power supply subcircuits, wherein a first power supply subcircuit of the power supply subcircuits comprises:
- a first over-voltage protection circuit, wherein the first over-voltage protection circuit has an input terminal connected to an input terminal of the first power supply subcircuit, and is configured to receive an input voltage to the first power supply subcircuit and output a first control signal;
- a first under-voltage protection circuit, wherein the first under-voltage protection circuit has a first input terminal connected to the input terminal of the first power supply subcircuit and a second input terminal connected to an output terminal of the first over-voltage protection circuit, and is configured to receive at least one of the first control signal or the input voltage and output a second control signal based on the at least one of the first control signal or the input voltage;
- a first drive circuit, wherein the first drive circuit has an input terminal connected to an output terminal of the first under-voltage protection circuit to receive the second control signal;
- and
- a first switching circuit, wherein the first switching circuit has a control terminal connected to an output terminal of the first drive circuit, and is configured for on-off control of the first power supply subcircuit,
- wherein the first drive circuit is configured to perform one of:
- in response to determining that the input voltage is greater than a preset lower limit voltage and less than a preset upper limit voltage, controlling the first switching circuit to be turned on;
- and in response to determining that the input voltage is greater than or equal to the preset upper limit voltage and/or is less than or equal to the preset lower limit voltage, controlling the first switching circuit to be turned off;
- and
- wherein the first over-voltage protection circuit comprises:
- a first resistor having a terminal connected to the input terminal of the first power supply subcircuit;
- a third resistor having a terminal connected to another terminal of the first resistor, and another terminal grounded;
- a fourth resistor having a terminal connected to the terminal of the third resistor;
- a first operational amplifier having a non-inverting input terminal connected to another terminal of the fourth resistor;
- a fifth resistor having a terminal connected to the non-inverting input terminal of the first operational amplifier, and another terminal connected to an output terminal of the first operational amplifier;
- a sixth resistor having a terminal connected to an inverting input terminal of the first operational amplifier;
- a second capacitor having a terminal connected to another terminal of the sixth resistor, and another terminal grounded;
- a seventh resistor having a terminal connected to the terminal of the second capacitor, and another terminal grounded;
- a ninth resistor having a terminal connected to the terminal of the seventh resistor, and another terminal connected to a direct current power source;
- a tenth resistor having a terminal connected to the output terminal of the first operational amplifier;
- and
- a first transistor having a base connected to another terminal of the tenth resistor, and an emitter grounded.
19 more elements
A working method of a power supply circuit, comprising:
- providing one or more power supply subcircuits in the power supply circuit, wherein a first power supply subcircuit of the power supply subcircuits comprises a first over-voltage protection circuit, a first under-voltage protection circuit, a first drive circuit, and a first switching circuit;
- electrically connecting an input terminal of the first power supply subcircuit to an input terminal of the first over-voltage protection circuit and a first input terminal of the first under-voltage protection circuit;
- electrically connecting an output terminal of the first over-voltage protection circuit to a second input terminal of the first under-voltage protection circuit;
- electrically connecting an output terminal of the first under-voltage protection circuit to an input terminal of the first drive circuit;
- and
- electrically connecting an output terminal of the first drive circuit to a control terminal of the first switching circuit for on-off control of the first power supply subcircuit,
- wherein the first drive circuit is configured to perform one of:
- in response to determining that the input voltage is greater than a preset lower limit voltage and less than a preset upper limit voltage, controlling the first switching circuit to be turned on;
- and in response to determining that the input voltage is greater than or equal to the preset upper limit voltage and/or is less than or equal to the preset lower limit voltage, controlling the first switching circuit to be turned off;
- and
- wherein the first over-voltage protection circuit comprises:
- a first resistor having a terminal connected to the input terminal of the first power supply subcircuit;
- a third resistor having a terminal connected to another terminal of the first resistor, and another terminal grounded;
- a fourth resistor having a terminal connected to the terminal of the third resistor;
- a first operational amplifier having a non-inverting input terminal connected to another terminal of the fourth resistor;
- a fifth resistor having a terminal connected to the non-inverting input terminal of the first operational amplifier, and another terminal connected to an output terminal of the first operational amplifier;
- a sixth resistor having a terminal connected to an inverting input terminal of the first operational amplifier;
- a second capacitor having a terminal connected to another terminal of the sixth resistor, and another terminal grounded;
- a seventh resistor having a terminal connected to the terminal of the second capacitor, and another terminal grounded;
- a ninth resistor having a terminal connected to the terminal of the seventh resistor, and another terminal connected to a direct current power source;
- a tenth resistor having a terminal connected to the output terminal of the first operational amplifier;
- and
- a first transistor having a base connected to another terminal of the tenth resistor, and an emitter grounded.
20 more elements
A lighting device, comprising:
- a power supply circuit comprising one or more power supply subcircuits;
- and
- a light-emitting device electrically connected to the power supply circuit,
- wherein a first power supply subcircuit of the power supply subcircuits comprises:
- a first over-voltage protection circuit, wherein the first over-voltage protection circuit has an input terminal connected to an input terminal of the first power supply subcircuit, and is configured to receive an input voltage to the first power supply subcircuit and output a first control signal;
- a first under-voltage protection circuit, wherein the first under-voltage protection circuit has a first input terminal connected to the input terminal of the first power supply subcircuit and a second input terminal connected to an output terminal of the first over-voltage protection circuit, and is configured to receive at least one of the first control signal or the input voltage and output a second control signal based on the at least one of the first control signal or the input voltage;
- a first drive circuit, wherein the first drive circuit has an input terminal connected to an output terminal of the first under-voltage protection circuit to receive the second control signal;
- and
- a first switching circuit, wherein the first switching circuit has a control terminal connected to an output terminal of the first drive circuit, and is configured for on-off control of the first power supply subcircuit,
- wherein the first drive circuit is configured to perform one of:
- in response to determining that the input voltage is greater than a preset lower limit voltage and less than a preset upper limit voltage, controlling the first switching circuit to be turned on;
- and in response to determining that the input voltage is greater than or equal to the preset upper limit voltage and/or is less than or equal to the preset lower limit voltage, controlling the first switching circuit to be turned off;
- and
- wherein the first over-voltage protection circuit comprises:
- a first resistor having a terminal connected to the input terminal of the first power supply subcircuit;
- a third resistor having a terminal connected to another terminal of the first resistor, and another terminal grounded;
- a fourth resistor having a terminal connected to the terminal of the third resistor;
- a first operational amplifier having a non-inverting input terminal connected to another terminal of the fourth resistor;
- a fifth resistor having a terminal connected to the non-inverting input terminal of the first operational amplifier, and another terminal connected to an output terminal of the first operational amplifier;
- a sixth resistor having a terminal connected to an inverting input terminal of the first operational amplifier;
- a second capacitor having a terminal connected to another terminal of the sixth resistor, and another terminal grounded;
- a seventh resistor having a terminal connected to the terminal of the second capacitor, and another terminal grounded;
- a ninth resistor having a terminal connected to the terminal of the seventh resistor, and another terminal connected to a direct current power source;
- a tenth resistor having a terminal connected to the output terminal of the first operational amplifier;
- and
- a first transistor having a base connected to another terminal of the tenth resistor, and an emitter grounded.
23 more elements
Dependencies are inferred from the claim text.