CN114156988A - Power supply circuit and loop resistance tester - Google Patents
Power supply circuit and loop resistance tester Download PDFInfo
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- CN114156988A CN114156988A CN202111485844.6A CN202111485844A CN114156988A CN 114156988 A CN114156988 A CN 114156988A CN 202111485844 A CN202111485844 A CN 202111485844A CN 114156988 A CN114156988 A CN 114156988A
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- 239000003990 capacitor Substances 0.000 claims abstract description 183
- 238000007599 discharging Methods 0.000 claims abstract description 73
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 42
- 229910052744 lithium Inorganic materials 0.000 claims description 42
- 238000001914 filtration Methods 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the invention discloses a power supply circuit and a loop resistance tester; the circuit comprises: the device comprises a capacitor module, a battery module, a discharge control module and a switching module; the battery module is used for outputting a first power supply to the capacitor module to charge the capacitor module when the power supply circuit is in a self-charging state, and outputting a second power supply together with the capacitor module when the power supply circuit is in a discharging state; the discharging control module is used for receiving a second power supply and supplying power to the loop resistance tester according to a power supply instruction when the power supply circuit is in a discharging state; the switching module is used for controlling the battery module and the capacitor module to form a parallel loop according to the charging instruction so as to enable the power supply circuit to enter a self-charging state, and controlling the battery module, the capacitor module and the discharging control module to form a series loop according to the discharging instruction so as to enable the power supply circuit to be switched from the self-charging state to a discharging state; the power supply circuit which is simple in design and small in size and weight and is used for supplying power to the loop resistance tester is achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supply circuits, in particular to a power supply circuit and a loop resistance tester.
Background
No matter the open type switch equipment or the gas insulation metal closed switch equipment is adopted in the electric power system, loop resistance tests are required to be carried out regularly to detect the conduction condition of the switch equipment, the potential safety hazards of the switch equipment are checked in time, and the switch equipment is prevented from being heated or even being burnt due to poor conduction conditions.
According to the requirements of 'power equipment handover and preventive test regulations', the test current of the conductive loop resistor of various switching equipment is not less than 100A, so that the high requirement is provided for the capacity of a test power supply of the loop resistor, 100A or even 200A current can be output at least, a common power supply loop (comprising a power supply test line, a power supply loop, a tested equipment loop resistor and the like) is designed according to the maximum 20m omega, and the output voltage of the test power supply can reach 4V (200A 20m omega is 4V) according to the ohm law.
Among traditional loop resistance test instrument, adopt mostly to overhaul the mains operated, overhaul mains voltage and generally be exchanging 220V, to the operating mode of low-voltage heavy current, must adopt transformer, alternating current-direct current conversion and DC-DC conversion scheme, this can lead to whole power design complicacy, bulky, and weight is heavier, and need follow in the maintenance power supply box and get the electricity through long distance wiring, and this is very inconvenient to outdoor removal operation.
Disclosure of Invention
The embodiment of the invention provides a power supply circuit and a loop resistance tester, and aims to realize the power supply circuit which is used for supplying power to the loop resistance tester and has the advantages of simple design and small size and weight.
In a first aspect, an embodiment of the present invention provides a power supply circuit, which is applied to a loop resistance tester, where a working state of the power supply circuit includes a self-charging state and a discharging state, and the power supply circuit includes:
a capacitive module;
the battery module is used for outputting a first power supply to the capacitor module to charge the capacitor module when the power supply circuit is in the self-charging state, and is used for outputting a second power supply together with the capacitor module when the power supply circuit is in the discharging state;
the current limiting module is used for limiting the current of the charging of the battery module to the capacitor module when the power supply circuit is in the self-charging state;
the discharge control module is used for receiving the second power supply and supplying power to the loop resistance tester according to a power supply instruction when the power supply circuit is in the discharge state;
the switching module is used for controlling the battery module and the capacitor module to form a parallel loop according to a charging instruction so as to enable the power supply circuit to enter the self-charging state, and controlling the battery module, the capacitor module and the discharging control module to form a series loop according to a discharging instruction so as to enable the power supply circuit to be switched from the self-charging state to the discharging state.
Optionally, the switching control module includes a first switching unit and a second switching unit;
the common end of the first switching unit is electrically connected with the first end of the battery module, the first end of the first switching unit is electrically connected with the first end of the current limiting module, and the second end of the first switching unit is electrically connected with the second end of the capacitor module;
a common end of the second switching unit is electrically connected with a first input end of the discharge control module, a first end of the second switching unit is electrically connected with a second end of the current limiting module, and a second end of the second switching unit is electrically connected with a second end of the capacitor module;
the second end of the battery module is electrically connected with the second input end of the discharge control module; the second end of the current limiting module is electrically connected with the first end of the capacitor module; the output end of the discharge control module is used for outputting a power supply required by the loop resistance tester;
the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the first end according to the charging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the second end according to the charging instruction, so that the battery module and the capacitor module form the parallel loop; and the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the second end according to the discharging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the first end according to the discharging instruction, so that the battery module, the capacitor module and the discharging control module form the series loop.
Optionally, the switching control module includes a first switching unit and a second switching unit;
the common end of the first switching unit is electrically connected with the first end of the battery module, the first end of the first switching unit is electrically connected with the first end of the current limiting module, and the second end of the first switching unit is electrically connected with the second end of the capacitor module;
the common end of the second switching unit is electrically connected with the second end of the capacitor module, the first end of the second switching unit is suspended, and the second end of the second switching unit is electrically connected with the second input end of the discharge control module;
the second end of the battery module is electrically connected with the second input end of the discharge control module; the second end of the current limiting module is electrically connected with the first end of the capacitor module and is electrically connected with the first input end of the discharge control module; the output end of the discharge control module is used for outputting a power supply required by the loop resistance tester;
the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the first end according to the charging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the second end according to the charging instruction, so that the battery module and the capacitor module form the parallel loop; and the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the second end according to the discharging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the first end according to the discharging instruction, so that the battery module, the capacitor module and the discharging control module form the series loop.
Optionally, the first switching unit comprises a first relay, and/or the second switching unit comprises a second relay;
a common contact of the first relay serves as a common end of the first switching unit, a first contact of the first relay serves as a first end of the first switching unit, and a second contact of the first relay serves as a second end of the first switching unit;
and the common contact of the second relay is used as a common end of the second switching unit, the first contact of the second relay is used as a second end of the second switching unit, and the second contact of the second relay is used as a second end of the second switching unit.
Optionally, the battery module comprises at least one lithium battery;
a first pole of the lithium battery is used as a first end of the battery module, and a second pole of the lithium battery is used as a second end of the battery module; or a first end formed by mutually and electrically connecting the plurality of lithium batteries in series is used as a first end of the battery module, and a second end formed by mutually and electrically connecting the plurality of lithium batteries in series is used as a second end of the battery module;
the capacitance module comprises at least one super capacitor; a first pole of the super capacitor is used as a first end of the capacitor module, and a second pole of the super capacitor is used as a second end of the capacitor module; or, a first end formed by mutually and electrically connecting the plurality of super capacitors in series serves as a first end of the capacitor module, and a second end formed by mutually and electrically connecting the plurality of super capacitors in series serves as a second end of the capacitor module.
Optionally, the output of the discharge control module comprises a first output and a second output; the discharge control module includes: a first transistor, a second transistor and an output capacitor;
a first end of the first transistor is used as a first input end of the discharge control module, a second end of the first transistor is used as a first output end of the discharge control module, and a control end of the first transistor is used for receiving the power supply instruction;
a first end of the second transistor is electrically connected with a first end of the first transistor, a second end of the second transistor serves as a second input end of the discharge control module, the second input end of the discharge control module is electrically connected with a second output end of the discharge control module, and a control end of the second transistor is used for receiving the power supply instruction;
the first pole of the output capacitor is electrically connected with the first end of the first transistor, and the second pole of the output capacitor is electrically connected with the second end of the second transistor.
Optionally, the power supply instruction is a PWM signal; the control terminal of the first transistor is received
What is needed is
The duty ratio of the power supply instruction is D, wherein D is more than or equal to 0 and less than or equal to 1; and the duty ratio of the power supply command received by the control end of the second transistor is 1-D.
Optionally, a filtering module is further included;
a first input end of the filtering module is electrically connected with a first output end of the discharging control module, and a second input end of the filtering module is electrically connected with a second output end of the discharging control module; the filtering module is used for filtering the power supplies required by the loop resistance tester and output by the first output end and the second output end of the discharge control module, and outputting the filtered power supplies required by the loop resistance tester at the output end of the filtering module.
Optionally, the system further comprises a control module;
the control module is used for monitoring the electric quantity of the capacitor module, sending the discharging instruction and the power supply instruction when monitoring that the electric quantity of the capacitor module is larger than or equal to a preset full charge quantity, and sending the charging instruction when monitoring that the electric quantity of the capacitor module is smaller than or equal to a preset charging electric quantity.
In a second aspect, an embodiment of the present invention further provides a loop resistance tester, including the power supply circuit according to the first aspect.
The embodiment of the invention is provided with a capacitor module, a battery module, a discharge control module and a switching module; the battery module is used for outputting a first power supply to the capacitor module to charge the capacitor module when the power supply circuit is in a self-charging state, and outputting a second power supply together with the capacitor module when the power supply circuit is in a discharging state; the discharging control module is used for receiving a second power supply and supplying power to the loop resistance tester according to a power supply instruction when the power supply circuit is in a discharging state; the switching module is used for controlling the battery module and the capacitor module to form a parallel loop according to the charging instruction so as to enable the power supply circuit to enter a self-charging state, and is used for controlling the battery module, the capacitor module and the discharging control module to form a series loop according to the discharging instruction so as to enable the power supply circuit to be switched from the self-charging state to the discharging state.
That is, in the embodiment of the present invention, based on the switching module and the discharging control module, the battery module charges the capacitor module when the power supply circuit does not supply power to the loop resistance tester, and when the power supply circuit is in a discharging state, the battery module and the capacitor module supply power to the loop resistance tester together, so that the power supply circuit for supplying power to the loop resistance tester has a simple structure and uses a small number of batteries.
Drawings
Fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the power supply circuit of FIG. 1 in a discharged state;
FIG. 3 is a schematic diagram of another power supply circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the power supply circuit of FIG. 3 in a discharged state;
FIG. 5 is a schematic diagram of another power supply circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the power supply circuit of fig. 5 in a discharge state.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The power supply circuit provided by the embodiment of the invention can be applied to a loop resistance tester to detect the loop resistance of the switch equipment. The operating state of the power supply circuit includes a self-charging state and a discharging state, fig. 1 is a schematic structural diagram of the power supply circuit provided in the embodiment of the present invention, and referring to fig. 1, the power supply circuit includes: a capacitor module 20, a battery module 10, a current limiting module 30, a discharge control module 40 and a switching module 50;
the battery module 10 is configured to output a first power to the capacitor module 20 to charge the capacitor module 20 when the power supply circuit is in a self-charging state, and is configured to output a second power together with the capacitor module 20 when the power supply circuit is in a discharging state; the current limiting module 30 is used for limiting the current of the charging of the battery module 10 to the capacitor module 20 when the power supply circuit is in a self-charging state;
the discharge control module 40 is used for receiving a second power supply and supplying power to the loop resistance tester according to a power supply instruction when the power supply circuit is in a discharge state; the switching module 50 is configured to control the battery module 10 and the capacitor module 20 to form a parallel circuit according to the charging instruction, so as to enable the power supply circuit to enter a self-charging state, and is configured to control the battery module 10, the capacitor module 20 and the discharging control module 40 to form a series circuit according to the discharging instruction, so as to enable the power supply circuit to be switched from the self-charging state to the discharging state.
Wherein, the capacitor module 20 may include a super capacitor; the battery module 10 may include a lithium battery; the current limiting module 30 may include a current limiting resistor for protecting the super capacitor when the lithium battery is charging the super capacitor.
Specifically, in a loop resistance test scenario, the power supply does not work all the time, but in a test process, the working time of the power supply is very short, and the test can be completed in 1 to 2 seconds. Although the power supply power in the loop resistor needs to be larger, the required energy is not much, so that a large amount of batteries are not needed for storing energy when the batteries are used for supplying power.
In view of this, the power supply in the power supply circuit provided in the embodiment of the present invention includes the capacitor module 20 in addition to the battery module 10, and the working states of the corresponding power supply circuit include a self-charging state and a discharging state; when the power supply circuit is in the self-charging state, the battery module 10 charges the capacitor module 20, and the capacitor module 20 stores energy, so that when the power supply circuit is in the discharging state, the capacitor module 20 and the battery module 10 can jointly supply power to the loop resistance tester. The power supply for supplying power to the loop resistance tester is provided in the embodiment of the invention, because the capacitor module 20 participates in power supply, the number of the batteries in the battery module 10 required to be arranged is greatly reduced, and thus the small size and the small weight of the power supply circuit are realized.
The power supply circuit provided by the embodiment of the invention is further provided with a switching module 50, the switching module 50 controls the battery module 10 and the capacitor module 20 to be in a parallel electric connection state in the power supply circuit, so that the battery module 10 can charge the capacitor module 20, a charging loop for charging the capacitor module 20 by the battery module 10 is formed in the power supply circuit, and the power supply circuit is in a self-charging state; and controlling the battery module 10 and the capacitor module 20 to be in a series electrical connection state in the power supply circuit through the switching module 50, so that the capacitor module 20, as an equivalent battery, and the battery module 10 jointly supply power to the loop resistance tester, a discharge circuit is formed in the power supply circuit, the capacitor module 20 and the battery module 10 jointly output power to the discharge control module 40, and the power supply circuit is in a discharge state.
Fig. 1 schematically illustrates that the switching module 50 controls the battery module 10 and the capacitor module 20 to form a parallel circuit, and the battery module 10 charges the capacitor module 20, so that the power supply circuit is in a self-charging state. Fig. 2 is a schematic structural diagram of the power supply circuit in fig. 1 in a discharging state, in fig. 2, the switching module 50 controls the capacitor module 20 and the battery module 10 to be in a series electrical connection state in the power supply circuit, and both the capacitor module 20 and the battery module 10 can supply power to the loop resistance tester, so that the power supply circuit is in the discharging state.
The power supply circuit provided by the embodiment of the invention only comprises the capacitor module 20, the battery module 10, the current limiting module 30, the discharge control module 40 and the switching module 50, so that not only is the small size and the small weight of the power supply circuit realized, but also the accurate power supply for the loop resistance tester is realized, the number of modules in the circuit structure is small, and the circuit connection structure is simple, so that the power supply circuit is not only convenient to carry, but also can be directly arranged in the loop resistance tester.
Based on the above, in the embodiment of the present invention, there are various specific structures of the switching module 50 and connection relations with other modules, and the following description describes some exemplary details, but not limiting the invention.
Fig. 3 is a schematic structural diagram of another power supply circuit provided in an embodiment of the present invention, and in an implementation manner of the present invention, optionally, referring to fig. 3, the switching control module includes a first switching unit 51 and a second switching unit 52;
the common terminal t1 of the first switching unit 51 is electrically connected with the first terminal of the battery module 10, the first terminal m1 of the first switching unit 51 is electrically connected with the first terminal of the current limiting module 30, and the second terminal n1 of the first switching unit 51 is electrically connected with the second terminal of the capacitor module 20; the common terminal t2 of the second switching unit 52 is electrically connected to the first input terminal x1 of the discharge control module 40, the first terminal m2 of the second switching unit 52 is electrically connected to the second terminal of the current limiting module 30, and the second terminal n1 of the second switching unit 52 is electrically connected to the second terminal of the capacitor module 20; a second end of the battery module 10 is electrically connected to a second input x2 of the discharge control module 40; a second terminal of current limiting module 30 is electrically connected to a first terminal of capacitive module 20; the output end of the discharge control module 40 is used for outputting a power supply required by the loop resistance tester;
the first switching unit 51 is configured to control the common terminal t1 thereof to be electrically connected to the first terminal m1 according to the charging command, and the second switching unit 52 is configured to control the common terminal t2 thereof to be electrically connected to the second terminal n2 according to the charging command, so that the battery module 10 and the capacitor module 20 form a parallel circuit; and the first switching unit 51 is used for controlling the common terminal t1 of the first switching unit to be electrically connected with the second terminal n1 according to the discharging instruction, and the second switching unit 52 is used for controlling the common terminal t2 of the first switching unit to be electrically connected with the first terminal m2 according to the discharging instruction, so that the battery module 10, the capacitor module 20 and the discharging control module 40 form a series loop.
Specifically, as exemplarily illustrated in fig. 3, when the first switching unit 51 controls the common terminal t1 of the first switching unit 51 to be electrically connected with the first terminal m1, and the second switching unit 52 controls the common terminal t2 of the second switching unit 52 to be electrically connected with the second terminal n2, the battery module 10 and the capacitor module 20 are in a parallel connection state in the power supply circuit, so that the battery module 10 charges the capacitor module 20 and the power supply circuit is in a self-charging state.
Fig. 4 is a schematic structural diagram of the power supply circuit in fig. 3 in a discharging state, in fig. 4, the first switching unit 51 controls the common terminal t1 of the first switching unit 51 to be electrically connected to the second terminal n1, the second switching unit 52 controls the common terminal t2 of the second switching unit 52 to be electrically connected to the first terminal m2, the battery module 10, the capacitor module 20 and the discharge control module 40 form a series circuit, so that both the capacitor module 20 and the battery module 10 discharge to the discharge control module 40, and the discharge control module 40 supplies power to the loop resistance tester, and the power supply circuit is in a discharging state.
Fig. 5 is a schematic structural diagram of another power supply circuit provided in an embodiment of the present invention, and in an implementation manner of the present invention, optionally, referring to fig. 5, the switching control module includes a first switching unit 51 and a second switching unit 52;
the common terminal t1 of the first switching unit 51 is electrically connected with the first terminal of the battery module 10, the first terminal m1 of the first switching unit 51 is electrically connected with the first terminal of the current limiting module 30, and the second terminal n1 of the first switching unit 51 is electrically connected with the second terminal of the capacitor module 20; the common terminal t2 of the second switching unit 52 is electrically connected to the second terminal of the capacitor module 20, the first terminal m2 of the second switching unit 52 is floating, and the second terminal n2 of the second switching unit 52 is electrically connected to the second input terminal x2 of the discharge control module 40; a second end of the battery module 10 is electrically connected to a second input x2 of the discharge control module 40; a second terminal of the current limiting module 30 is electrically connected to the first terminal of the capacitor module 20 and to a first input terminal x1 of the discharging control module 40; the output end of the discharge control module 40 is used for outputting a power supply required by the loop resistance tester;
the first switching unit 51 is configured to control the common terminal t1 thereof to be electrically connected to the first terminal m1 according to the charging command, and the second switching unit 52 is configured to control the common terminal t2 thereof to be electrically connected to the second terminal n2 according to the charging command, so that the battery module 10 and the capacitor module 20 form a parallel circuit; and the first switching unit 51 is used for controlling the common terminal t1 of the first switching unit to be electrically connected with the second terminal n1 according to the discharging instruction, and the second switching unit 52 is used for controlling the common terminal t2 of the first switching unit to be electrically connected with the first terminal m2 according to the discharging instruction, so that the battery module 10, the capacitor module 20 and the discharging control module 40 form a series loop.
Specifically, as exemplarily illustrated in fig. 5, when the first switching unit 51 controls the common terminal t1 of the first switching unit 51 to be electrically connected with the first terminal m1, and the second switching unit 52 controls the common terminal t2 of the second switching unit 52 to be electrically connected with the second terminal n2, the battery module 10 and the capacitor module 20 are in a parallel connection state in the power supply circuit, so that the battery module 10 charges the capacitor module 20 and the power supply circuit is in a self-charging state.
Fig. 6 is a schematic structural diagram of the power supply circuit in fig. 5 in a discharging state, in fig. 6, the first switching unit 51 controls the common terminal t1 of the first switching unit 51 to be electrically connected to the second terminal n1, the second switching unit 52 controls the common terminal t2 of the second switching unit 52 to be electrically connected to the first terminal m2, the battery module 10, the capacitor module 20 and the discharge control module 40 form a series circuit, so that both the capacitor module 20 and the battery module 10 discharge to the discharge control module 40, and the discharge control module 40 supplies power to the loop resistance tester, and the power supply circuit is in a discharging state.
In the embodiment of the present invention, the power supply circuit illustrated in fig. 5 is different from the power supply circuit illustrated in fig. 3 in that: the discharging control module 40 of the power supply circuit illustrated in fig. 3 is connected in series in the charging circuit, while the discharging control module 40 of the power supply circuit illustrated in fig. 5 is not connected in series in the charging circuit; therefore, the power supply circuit illustrated in fig. 5 has less power consumption in the self-charging state than the power supply circuit illustrated in fig. 3.
Based on the above, in an embodiment of the present invention, optionally, the first switching unit 51 includes the first relay S1, and/or the second switching unit 52 includes the second relay S2; a common contact of the first relay S1 serves as the common terminal t1 of the first switching unit 51, a first contact of the first relay S1 serves as the first terminal m1 of the first switching unit 51, and a second contact of the first relay S1 serves as the second terminal n2 of the first switching unit 51; a common contact of the second relay S2 serves as the common terminal t2 of the second switching unit 52, a first contact of the second relay S2 serves as the second terminal m2 of the second switching unit 52, and a second contact of the second relay S2 serves as the second terminal n2 of the second switching unit 52.
Specifically, in the embodiment of the present invention, the first switching unit 51 and the second switching unit 52 are both provided as relays, so that respective contacts (e.g., a first contact, a second contact, and a common contact) of the relays can be directly used as respective connection terminals (e.g., a first terminal, a second terminal, and a common terminal) of the first switching unit 51 and the second switching unit 52 in correspondence, further simplifying the structure of the power supply circuit; meanwhile, the relays are used as the first switching unit 51 and the second switching unit 52, and the generated power consumption is low in the process that the first switching unit 51 and the second switching unit 52 control the working state of the power supply circuit, so that the power consumption of the whole power supply circuit is low, and the service life of the power supply circuit is further ensured.
In one embodiment of the present invention, optionally, the battery module 10 comprises at least one lithium battery E; a first pole of lithium battery E, such as the anode of lithium battery E, serves as the first end of battery module 10, and a second pole of lithium battery E, such as the cathode of lithium battery E, serves as the second end of battery module 10; or, a first end formed by the plurality of lithium batteries E electrically connected in series is used as the first end of the battery module 10, and a second end formed by the plurality of lithium batteries E electrically connected in series is used as the second end of the battery module 10; the capacitive module 20 comprises at least one supercapacitor C1; a first pole of the super capacitor C1 is used as a first terminal of the capacitor module 20, and a second pole of the super capacitor C1 is used as a second terminal of the capacitor module 20; alternatively, a first end formed by electrically connecting the plurality of super capacitors in series serves as the first end of the capacitor module 20, and a second end formed by electrically connecting the plurality of super capacitors in series serves as the second end of the capacitor module 20.
Specifically, in the embodiment of the present invention, since both the capacitor module 20 and the battery module 10 supply power to the loop resistance tester, the number of batteries in the battery module 10 can be reduced. Of course, the number of the batteries in the battery module 10 and the number of the capacitors in the capacitor module 20 may be configured according to actual needs, and are not specifically limited herein.
In one embodiment of the present invention, optionally, the output terminal of the discharge control module 40 includes a first output terminal y1 and a second output terminal y 2; the discharge control module 40 includes: a first transistor Q1, a second transistor Q2, and an output capacitor C2;
a first terminal of the first transistor Q1 is used as a first input terminal x1 of the discharge control module 40, a second terminal of the first transistor Q1 is used as a first output terminal y1 of the discharge control module 40, and a control terminal of the first transistor Q1 is used for receiving a power supply instruction; a first end of the second transistor Q2 is electrically connected with a first end of the first transistor Q1, a second end of the second transistor Q2 serves as a second input end x2 of the discharge control module 40, the second input end x2 of the discharge control module 40 is electrically connected with a second output end y2 of the discharge control module 40, and a control end of the second transistor Q2 is used for receiving a power supply instruction; a first pole of the output capacitor C2 is electrically connected to a first terminal of the first transistor Q1, and a second pole of the output capacitor C2 is electrically connected to a second terminal of the second transistor Q2.
Specifically, referring to fig. 3, a loop resistance tester as a load may be electrically connected to the first output terminal y1 and the second output terminal y2 of the discharge control module 40; when the power supply circuit is in a discharging state, the first transistor Q1 and the second transistor Q2 control the power supplied to the loop resistance tester by the battery module 10 and the capacitor module 20, that is, the first transistor Q1 and the second transistor Q2 provide the required power supply to the loop resistance tester according to the power supply instruction, so as to accurately supply power to the loop resistance tester. And, when the power supply circuit is in a self-charging state, when the charging circuit is failed, since the first transistor Q1 and the second transistor Q2 are connected in series in the charging circuit, the charging circuit can be quickly cut off, and the battery module 10 and the capacitor module 20 are protected.
Based on the above, in an embodiment of the present invention, optionally, the power supply instruction is a PWM signal; the duty ratio of the power supply command received by the control end of the first transistor Q1 is D, wherein D is more than or equal to 0 and less than or equal to 1; the duty cycle of the power supply command received at the control terminal of the second transistor Q2 is 1-D.
Specifically, when the power supply circuit is in the self-charging state, the first transistor Q1 and the second transistor Q2 are in the on state. When the power supply circuit is in a discharging state, the first transistor Q1 and the second transistor Q2 are both in a high-frequency PWM working state, so that the output current can be accurately controlled by controlling the duty ratio of PWM; the first transistor Q1 and the second transistor Q2 work complementarily at high frequency (i.e., one is turned on and the other is turned off), and when the duty ratio of the first transistor Q1 is D (0. ltoreq. D. ltoreq.1), the duty ratio of the second transistor Q2 is 1-D, so that the output voltage can be controlled by controlling the duty ratio of the first transistor Q1. When the output current is controlled in a closed-loop control mode, constant direct current output current can be obtained.
With continued reference to fig. 3 or 5, in one embodiment of the present invention, the power supply circuit optionally further comprises a filtering module 60; a first input terminal of the filter module 60 is electrically connected with the first output terminal y1 of the discharge control module 40, and a second input terminal of the filter module 60 is electrically connected with the second output terminal y2 of the discharge control module 40; the filtering module 60 is configured to filter the power required by the loop resistance tester output by the first output terminal y1 and the second output terminal y2 of the discharge control module 40, and output the filtered power required by the loop resistance tester at the output terminal of the filtering module 60.
Illustratively, the output of the filtering module 60 includes a first output and a second output. The filtering module 60 comprises a filtering inductor L and a filtering capacitor C3; a first end of the filter inductor L is used as a first input end of the filter module 60, and a second end of the filter inductor L is used as a first output end of the filter module 60; a first end of the filter capacitor C3 is electrically connected to a second end of the filter inductor L, a second end of the filter capacitor C3 is used as a second input end of the filter module 60, and a second output end of the filter module 60 is connected to a second input end of the filter module 60. That is, the filter inductor L and the filter capacitor C3 constitute a filter circuit, and the switching sub-component caused by the high-frequency chopping is filtered out, so that the dc component is obtained at the first output end and the second output end of the filter module 60, and the dc voltage required by the loop resistance tester is output.
In an embodiment of the present invention, optionally, the system further includes a control module; the control module is configured to monitor the electric quantity of the capacitor module 20, and send a discharge instruction and a power supply instruction when the electric quantity of the capacitor module 20 is monitored to be greater than or equal to a preset full charge amount, and send a charge instruction when the electric quantity of the capacitor module 20 is monitored to be less than or equal to a preset charge electric quantity.
The preset full charge amount can be set according to actual needs. For example, when the electric quantity of the capacitor module 20 is a preset full charge quantity, the capacitor module 20 is in a full-charge state; when the control module monitors that the capacitor module 20 reaches or is in a full state, the control module sends a discharging instruction to the switching module 50 to enable the switching module 50 to control the power supply circuit to be switched to a discharging state, and sends a power supply instruction to the discharging control module 40 to enable the discharging control module 40 to control the power supply circuit to accurately supply power to the loop resistance tester.
The preset charging capacity can be set according to actual needs. For example, when the charge capacity of the capacitor module 20 is less than or equal to the preset charge capacity, the capacitor module 20 is in a state of insufficient charge capacity; when the control module monitors that the power of the capacitor module 20 is decreased to a state of insufficient power, the control module sends a charging command to the switching module 50 to enable the switching module 50 to control the power supply to be switched to a self-charging state, and control the first transistor Q1 and the second transistor Q2 in the discharge control module 40 to be in a conducting state.
Referring to fig. 3, a more complete description is provided for an operation process of the power supply circuit according to the embodiment of the present invention, where the current limiting module 30 includes a current limiting resistor R, the battery module 10 includes a lithium battery E, an anode of the lithium battery E serves as a first end of the battery module 10, a cathode of the lithium battery E serves as a second end of the battery module 10, the capacitor module 20 includes a super capacitor C1, the first switching unit 51 includes a first relay S1, the second switching unit 52 includes a second relay S2, the discharging control module 40 includes a first transistor Q1, a second transistor Q2, and an output capacitor C2, and the filter module 60 includes a filter inductor L and a filter capacitor C3:
when the control module monitors that the electric quantity of the super capacitor C1 is smaller than or equal to a preset charging electric quantity, the control module sends a charging instruction to the first relay S1 and the second relay S2, and the control module controls the first transistor Q1 and the second transistor Q2 to be in a conducting state; the first relay S1 responds to the charging command so that the common contact of the first relay S1 is conductive with the first contact and the common contact of the first relay S1 is non-conductive with the second contact, and the second relay S2 responds to the charging command so that the common contact of the second relay S2 is conductive with the second contact and the common contact of the second relay S2 is non-conductive with the second contact; thus, the lithium battery E, the current-limiting resistor R, the super capacitor, the first transistor Q1 and the second transistor Q2 form a charging loop, the lithium battery E and the super capacitor are in a parallel electric connection state, the lithium battery E charges the super capacitor, and the power supply circuit is in a self-charging state; during the charging of the super capacitor by the lithium battery E, if a charging loop fails, the first transistor Q1 and the second transistor Q2 can quickly cut off the charging loop, so that the lithium battery E and the super capacitor C1 are protected;
along with the advance of time, the control module monitors that the electric quantity of the super capacitor C1 is larger than or equal to a preset full charge quantity, the control module sends a discharge instruction to a first relay S1 and a second relay S2, the control module controls a first transistor Q1 and a second transistor Q2 to be turned off, the control module sends a PWM power supply instruction to a first transistor Q1 and a second transistor Q2, wherein the duty ratio of the first transistor Q1 is D (D is larger than or equal to 0 and smaller than or equal to 1), and the duty ratio of the second transistor Q2 is 1-D; the first relay S1 responds to the discharging command, so that the common contact of the first relay S1 is conducted with the second contact, the common contact of the first relay S1 is not conducted with the first contact, and the second relay S2 responds to the charging command, so that the common contact of the second relay S2 is conducted with the first contact, and the common contact of the second relay S2 is not conducted with the second contact; therefore, the lithium battery E and the super capacitor are in a series electric connection state, the lithium battery E, the super capacitor, the output capacitor, the first transistor Q1, the second transistor Q2, the filter inductor L and the filter capacitor C3 form a discharge circuit, the power supply circuit is in a discharge state, the direct current voltage Vo required by the loop resistance tester is output at the second end of the filter inductor L and the second end of the filter capacitor C3, Vo is D (Vb + Vc), Vb is the voltage of the lithium battery E, and Vc is the voltage of the super capacitor.
Based on the above, if the specification requirement that the output voltage Vo is not less than 4V is to be met, and the duty ratio D satisfies that D is greater than or equal to 0 and less than or equal to 1, the sum of the voltages of the lithium battery E and the super capacitor cannot be less than 4V. At present, the working voltage range of a single polymer lithium battery E is 3V to 4.2V, and the maximum voltage of a single super capacitor is 2.7V, so that the output requirement can be met by adopting the single polymer lithium battery E and the single super capacitor, and the maximum voltage of the single polymer lithium battery E connected with the single super capacitor in series is 5.7V to 6.9V, so that the output requirement can be met by adopting the minimum lithium battery E and the minimum super capacitor in the embodiment of the invention.
For comparison, the following describes the operation process of the power supply circuit according to the embodiment of the present invention with reference to fig. 5 more completely:
when the control module monitors that the electric quantity of the super capacitor C1 is smaller than or equal to a preset charging electric quantity, the control module sends a charging instruction to the first relay S1 and the second relay S2, and the control module controls the first transistor Q1 and the second transistor Q2 to be in a conducting state; the first relay S1 responds to the charging command so that the common contact of the first relay S1 is conductive with the first contact and the common contact of the first relay S1 is non-conductive with the second contact, and the second relay S2 responds to the charging command so that the common contact of the second relay S2 is conductive with the second contact and the common contact of the second relay S2 is non-conductive with the second contact; thus, the lithium battery E, the current-limiting resistor R and the super capacitor form a charging loop, the lithium battery E and the super capacitor are in a parallel electric connection state, the lithium battery E charges the super capacitor, and the power supply circuit is in a self-charging state; during the charging period of the super capacitor by the lithium battery E, the charging circuit does not comprise the first transistor Q1 and the second transistor Q2, so that the power supply circuit has smaller power consumption;
along with the advance of time, the control module monitors that the electric quantity of the super capacitor C1 is larger than or equal to a preset full charge quantity, the control module controls the first transistor Q1 and the second transistor Q2 to be turned off, the control module sends a discharge instruction to the first relay S1 and the second relay S2, the control module sends a PWM power supply instruction to the first transistor Q1 and the second transistor Q2, wherein the duty ratio of the first transistor Q1 is D (D is larger than or equal to 0 and smaller than or equal to 1), and the duty ratio of the second transistor Q2 is 1-D; the first relay S1 responds to the discharging command, so that the common contact of the first relay S1 is conducted with the second contact, the common contact of the first relay S1 is not conducted with the first contact, and the second relay S2 responds to the charging command, so that the common contact of the second relay S2 is conducted with the first contact, and the common contact of the second relay S2 is not conducted with the second contact; therefore, the lithium battery E and the super capacitor are in a series electric connection state, the lithium battery E, the super capacitor, the output capacitor, the first transistor Q1, the second transistor Q2, the filter inductor L and the filter capacitor C3 form a discharge circuit, the power supply circuit is in a discharge state, the direct current voltage Vo required by the loop resistance tester is output at the second end of the filter inductor L and the second end of the filter capacitor C3, Vo is D (Vb + Vc), Vb is the voltage of the lithium battery E, and Vc is the voltage of the super capacitor.
The embodiment of the invention also provides a loop resistance tester, which comprises the power supply circuit provided by any embodiment, and the power supply circuit can be directly arranged in the loop resistance tester so as to provide a required power supply for the loop resistance tester. The power supply circuit and the loop resistance tester belong to the same invention concept, can realize the same technical effect, and repeated content is not repeated here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A power supply circuit is applied to a loop resistance tester, and is characterized in that the working state of the power supply circuit comprises a self-charging state and a discharging state, and the power supply circuit comprises:
a capacitive module;
the battery module is used for outputting a first power supply to the capacitor module to charge the capacitor module when the power supply circuit is in the self-charging state, and is used for outputting a second power supply together with the capacitor module when the power supply circuit is in the discharging state;
the current limiting module is used for limiting the current of the charging of the battery module to the capacitor module when the power supply circuit is in the self-charging state;
the discharge control module is used for receiving the second power supply and supplying power to the loop resistance tester according to a power supply instruction when the power supply circuit is in the discharge state;
the switching module is used for controlling the battery module and the capacitor module to form a parallel loop according to a charging instruction so as to enable the power supply circuit to enter the self-charging state, and controlling the battery module, the capacitor module and the discharging control module to form a series loop according to a discharging instruction so as to enable the power supply circuit to be switched from the self-charging state to the discharging state.
2. The power supply circuit according to claim 1, wherein the switching control module comprises a first switching unit and a second switching unit;
the common end of the first switching unit is electrically connected with the first end of the battery module, the first end of the first switching unit is electrically connected with the first end of the current limiting module, and the second end of the first switching unit is electrically connected with the second end of the capacitor module;
a common end of the second switching unit is electrically connected with a first input end of the discharge control module, a first end of the second switching unit is electrically connected with a second end of the current limiting module, and a second end of the second switching unit is electrically connected with a second end of the capacitor module;
the second end of the battery module is electrically connected with the second input end of the discharge control module; the second end of the current limiting module is electrically connected with the first end of the capacitor module; the output end of the discharge control module is used for outputting a power supply required by the loop resistance tester;
the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the first end according to the charging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the second end according to the charging instruction, so that the battery module and the capacitor module form the parallel loop; and the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the second end according to the discharging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the first end according to the discharging instruction, so that the battery module, the capacitor module and the discharging control module form the series loop.
3. The power supply circuit according to claim 1, wherein the switching control module comprises a first switching unit and a second switching unit;
the common end of the first switching unit is electrically connected with the first end of the battery module, the first end of the first switching unit is electrically connected with the first end of the current limiting module, and the second end of the first switching unit is electrically connected with the second end of the capacitor module;
the common end of the second switching unit is electrically connected with the second end of the capacitor module, the first end of the second switching unit is suspended, and the second end of the second switching unit is electrically connected with the second input end of the discharge control module;
the second end of the battery module is electrically connected with the second input end of the discharge control module; the second end of the current limiting module is electrically connected with the first end of the capacitor module and is electrically connected with the first input end of the discharge control module; the output end of the discharge control module is used for outputting a power supply required by the loop resistance tester;
the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the first end according to the charging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the second end according to the charging instruction, so that the battery module and the capacitor module form the parallel loop; and the first switching unit is used for controlling the common end of the first switching unit to be electrically connected with the second end according to the discharging instruction, and the second switching unit is used for controlling the common end of the second switching unit to be electrically connected with the first end according to the discharging instruction, so that the battery module, the capacitor module and the discharging control module form the series loop.
4. Supply circuit according to any of claims 2 or 3, characterized in that the first switching unit comprises a first relay and/or the second switching unit comprises a second relay;
a common contact of the first relay serves as a common end of the first switching unit, a first contact of the first relay serves as a first end of the first switching unit, and a second contact of the first relay serves as a second end of the first switching unit;
and the common contact of the second relay is used as a common end of the second switching unit, the first contact of the second relay is used as a second end of the second switching unit, and the second contact of the second relay is used as a second end of the second switching unit.
5. The power supply circuit of claim 1, wherein the battery module comprises at least one lithium battery;
a first pole of the lithium battery is used as a first end of the battery module, and a second pole of the lithium battery is used as a second end of the battery module; or a first end formed by mutually and electrically connecting the plurality of lithium batteries in series is used as a first end of the battery module, and a second end formed by mutually and electrically connecting the plurality of lithium batteries in series is used as a second end of the battery module;
the capacitance module comprises at least one super capacitor; a first pole of the super capacitor is used as a first end of the capacitor module, and a second pole of the super capacitor is used as a second end of the capacitor module; or, a first end formed by mutually and electrically connecting the plurality of super capacitors in series serves as a first end of the capacitor module, and a second end formed by mutually and electrically connecting the plurality of super capacitors in series serves as a second end of the capacitor module.
6. The power supply circuit according to claim 2 or 3, wherein the output terminal of the discharge control module comprises a first output terminal and a second output terminal; the discharge control module includes: a first transistor, a second transistor and an output capacitor;
a first end of the first transistor is used as a first input end of the discharge control module, a second end of the first transistor is used as a first output end of the discharge control module, and a control end of the first transistor is used for receiving the power supply instruction;
a first end of the second transistor is electrically connected with a first end of the first transistor, a second end of the second transistor serves as a second input end of the discharge control module, the second input end of the discharge control module is electrically connected with a second output end of the discharge control module, and a control end of the second transistor is used for receiving the power supply instruction;
the first pole of the output capacitor is electrically connected with the first end of the first transistor, and the second pole of the output capacitor is electrically connected with the second end of the second transistor.
7. The power supply circuit according to claim 6, wherein the power supply instruction is a PWM signal; the duty ratio of the power supply command received by the control end of the first transistor is D, wherein D is more than or equal to 0 and less than or equal to 1; and the duty ratio of the power supply command received by the control end of the second transistor is 1-D.
8. The power supply circuit of claim 6, further comprising a filtering module;
a first input end of the filtering module is electrically connected with a first output end of the discharging control module, and a second input end of the filtering module is electrically connected with a second output end of the discharging control module; the filtering module is used for filtering the power supplies required by the loop resistance tester and output by the first output end and the second output end of the discharge control module, and outputting the filtered power supplies required by the loop resistance tester at the output end of the filtering module.
9. The power supply circuit of claim 1, further comprising a control module;
the control module is used for monitoring the electric quantity of the capacitor module, sending the discharging instruction and the power supply instruction when monitoring that the electric quantity of the capacitor module is larger than or equal to a preset full charge quantity, and sending the charging instruction when monitoring that the electric quantity of the capacitor module is smaller than or equal to a preset charging electric quantity.
10. A loop resistance tester comprising a supply circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111485844.6A CN114156988A (en) | 2021-12-07 | 2021-12-07 | Power supply circuit and loop resistance tester |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111485844.6A CN114156988A (en) | 2021-12-07 | 2021-12-07 | Power supply circuit and loop resistance tester |
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| CN202111485844.6A Pending CN114156988A (en) | 2021-12-07 | 2021-12-07 | Power supply circuit and loop resistance tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117913961A (en) * | 2024-03-19 | 2024-04-19 | 长峡数字能源科技(湖北)有限公司 | Energy storage circuit system and working mode switching method thereof |
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| US6157179A (en) * | 1997-06-13 | 2000-12-05 | U.S. Philips Corporation | Switched-mode power supply for charging a capacitance during a first period, forming a resonant circuit with an inductance, and discharging the capacitance into a load during a second period disjunct from the first period |
| CN111884289A (en) * | 2020-07-23 | 2020-11-03 | 广东电网有限责任公司清远供电局 | Power supply for loop resistance test and loop resistance tester |
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2021
- 2021-12-07 CN CN202111485844.6A patent/CN114156988A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6157179A (en) * | 1997-06-13 | 2000-12-05 | U.S. Philips Corporation | Switched-mode power supply for charging a capacitance during a first period, forming a resonant circuit with an inductance, and discharging the capacitance into a load during a second period disjunct from the first period |
| CN111884289A (en) * | 2020-07-23 | 2020-11-03 | 广东电网有限责任公司清远供电局 | Power supply for loop resistance test and loop resistance tester |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117913961A (en) * | 2024-03-19 | 2024-04-19 | 长峡数字能源科技(湖北)有限公司 | Energy storage circuit system and working mode switching method thereof |
| CN117913961B (en) * | 2024-03-19 | 2024-05-14 | 长峡数字能源科技(湖北)有限公司 | Energy storage circuit system and working mode switching method thereof |
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