SELECTIVE PROTECTION CIRCUIT AND METHOD, AND POWER SUPPLY SYSTEM
First Claim
1. A selective protection circuit, comprising:
- a current-limiting module; and
a control module,wherein the selective protection is included in a high-voltage direct current (HVDC) power supply that supplies power to at least two parallel load branches, wherein each load branch of the at least two parallel load branches comprises one voltage pre-regulator circuitwherein the current-limiting module comprises a switch unit, and the switch unit comprises a first end, a second end, and a control end;
wherein the first end is connected to a positive electrode of a bus voltage of the HVDC power supply, and the second end is connected to a positive electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module;
or the first end is connected to a negative electrode of a bus voltage of the HVDC power supply, and the second end is connected to a negative electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module;
wherein the control end is connected to the control module; and
wherein the control module is configured to output a control signal to the control end when a value of a total current flowing through the switch unit is greater than or equal to a preset threshold, so as to switch off the switch unit, wherein the preset threshold is greater than a maximum value of a normal operating current flowing through the switch unit.
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Accused Products
Abstract
A selective protection circuit includes a current-limiting module and a control module, where the current-limiting module includes a switch unit, and the switch unit includes a first end, a second end, and a control end; the first end is connected to a positive electrode of a bus voltage of an HVDC power supply, and the second end is connected to a positive electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module; the control end is connected to the control module; and the control module is configured to output a control signal to the control end when a value of a total current flowing through the switch unit is greater than or equal to a preset threshold, so as to switch off the switch unit.
14 Citations
18 Claims
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1. A selective protection circuit, comprising:
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a current-limiting module; and a control module, wherein the selective protection is included in a high-voltage direct current (HVDC) power supply that supplies power to at least two parallel load branches, wherein each load branch of the at least two parallel load branches comprises one voltage pre-regulator circuit wherein the current-limiting module comprises a switch unit, and the switch unit comprises a first end, a second end, and a control end; wherein the first end is connected to a positive electrode of a bus voltage of the HVDC power supply, and the second end is connected to a positive electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module;
or the first end is connected to a negative electrode of a bus voltage of the HVDC power supply, and the second end is connected to a negative electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module;wherein the control end is connected to the control module; and wherein the control module is configured to output a control signal to the control end when a value of a total current flowing through the switch unit is greater than or equal to a preset threshold, so as to switch off the switch unit, wherein the preset threshold is greater than a maximum value of a normal operating current flowing through the switch unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A selective protection method, applied to a scenario in which a high-voltage direct current (HVDC) power supply is used to supply power, wherein the HVDC power supply supplies power to at least two parallel load branches, and each load branch of the at least two parallel load branches comprises one voltage pre-regulator circuit;
- and the method comprises;
detecting a value of a total current flowing through a target channel, wherein the target channel refers to a channel between a positive electrode of a bus voltage of the HVDC power supply and a positive electrode of a power supply of a voltage pre-regulator circuit in one load branch of the at least two parallel load branches, or a channel between a negative electrode of a bus voltage of the HVDC power supply and a negative electrode of a power supply of a voltage pre-regulator circuit in one load branch of the at least two parallel load branches; and in response to the value of the total current being greater than or equal to a preset threshold, controlling to shut down the target channel, wherein the preset threshold is greater than a maximum value of a normal operating current flowing through the target channel. - View Dependent Claims (9, 10, 11)
- and the method comprises;
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12. A power supply system, comprising:
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a selective protection circuit; and a high-voltage direct current (HVDC) power supply, wherein the HVDC power supply supplies power to at least two parallel load branches, and each load branch of the at least two parallel load branches comprises one voltage pre-regulator circuit; wherein the selective protection circuit comprises a current-limiting module and a control module, wherein the current-limiting module comprises a switch unit, and the switch unit comprises a first end, a second end, and a control end; wherein the first end is connected to a positive electrode of a bus voltage of the HVDC power supply, and the second end is connected to a positive electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module;
or the first end is connected to a negative electrode of a bus voltage of the HVDC power supply, and the second end is connected to a negative electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module;wherein the control end is connected to the control module; and wherein the control module is configured to output a control signal to the control end when a value of a total current flowing through the switch unit is greater than or equal to a preset threshold, so as to switch off the switch unit, wherein the preset threshold is greater than a maximum value of a normal operating current flowing through the switch unit. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification