CN116885962A - Energy management circuit for power transformer on-line monitoring equipment - Google Patents
Energy management circuit for power transformer on-line monitoring equipment Download PDFInfo
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- CN116885962A CN116885962A CN202310758430.9A CN202310758430A CN116885962A CN 116885962 A CN116885962 A CN 116885962A CN 202310758430 A CN202310758430 A CN 202310758430A CN 116885962 A CN116885962 A CN 116885962A
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- 238000004146 energy storage Methods 0.000 claims abstract description 41
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- 239000002253 acid Substances 0.000 description 1
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to the technical field of energy management circuits, in particular to an energy management circuit for on-line monitoring equipment of a power transformer, which comprises a rectifying circuit, a step-up/step-down circuit and an energy storage unit, wherein the rectifying circuit is connected with the step-up/step-down circuit; the input end of the energy management circuit is an energy collection device, the output end of the energy management circuit is power transformer on-line monitoring equipment, the rectifying circuit rectifies output voltage generated by the energy collection device, the voltage rising/dropping operation is carried out through the voltage rising/dropping circuit, the collected electric energy is stored or released through the energy storage unit, and finally the electric energy is connected with the on-line monitoring equipment to supply power to the electric energy. The invention solves the problems that the input and output between the energy collecting device and the on-line monitoring equipment are not matched and the working time cannot be continuous. Compared with the traditional energy management circuit, the energy management circuit has the advantages of high-efficiency energy storage management function, stable output and relatively low hardware cost.
Description
Technical Field
The invention relates to the technical field of energy management circuits, in particular to an energy management circuit for on-line monitoring equipment of a power transformer.
Background
The power transformer is used as one of core equipment for energy transmission and conversion in a power system, plays a vital role in the power system, and once the power transformer fails, the safety operation of the whole power system can be greatly influenced. At present, most transformers with the voltage of more than 110kV are gradually provided with on-line monitoring devices such as dissolved gas in transformer oil, partial discharge, insulation of capacitive equipment and the like, but the monitoring systems of the running state, the insulation state, the current carrying state and the cooling system of the transformer still need to break through, the data acquisition coverage is insufficient, and the comprehensive data acquisition of the transformer is difficult to realize, so that the safe and reliable running of a power system can be ensured only by enhancing the monitoring and diagnosis of the transformer and finding faults and hidden dangers at early points.
Because the transformer is mostly arranged in the field environment, and the voltage and current levels are higher, external environmental factors can easily influence the transformer. The low-voltage side of the transformer can not supply power to the monitoring equipment, and the alternative energy supply modes at present comprise a micro battery and a wired power supply, the micro battery has the advantages of limited storage density, short endurance time and overlarge volume and mass, the fatal disadvantage of the wired power supply is that the micro battery can not get rid of the constraint of a power line, the application of the micro battery in independent micro systems such as on-line monitoring equipment is greatly restricted, the power supply becomes difficult, and a vibration energy collector capable of converting vibration energy in natural environment into electric energy becomes one of the methods tried by people.
The power generation modes of the vibration energy collector mainly comprise piezoelectric modes, electromagnetic modes, electrostatic modes, magnetostrictive modes and the like, wherein the electromagnetic vibration energy collector is simple in structure, high in power density, small in output impedance and suitable for running in a low-frequency environment, however, the electromagnetic vibration energy collector is low in output voltage in the low-frequency environment, the output voltage is alternating-current voltage, and the power transformer on-line monitoring equipment is generally powered by direct current, so that a proper energy management circuit is needed to realize high-efficiency electric energy conversion under low input voltage. In view of this, there is a need to provide an energy management circuit for an on-line monitoring device for a power transformer.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an energy management circuit for an on-line monitoring device of a power transformer, which solves the problems that the input and output between an energy collecting device and the on-line monitoring device are not matched and the working time cannot be continuous. Compared with the traditional energy management circuit, the energy management circuit has the advantages of high-efficiency energy storage management function, stable output and relatively low hardware cost. The specific technical scheme is as follows:
an energy management circuit for an on-line monitoring device of a power transformer comprises a rectifying circuit, a step-up/step-down circuit and an energy storage unit;
the input end of the rectifying circuit is connected with the energy collecting device, and the output end of the rectifying circuit is connected with the input end of the step-up/step-down circuit; the output end of the step-up/step-down circuit is connected with the input end of the energy storage unit, and the output end of the energy storage unit is connected with the on-line monitoring equipment;
the rectification circuit is used for rectifying the output alternating voltage generated by the energy collecting device and inputting the direct-current voltage obtained after rectification into the step-up/step-down circuit;
the step-up/step-down circuit is used for carrying out step-up/step-down on the direct-current voltage obtained after rectification and inputting the direct-current voltage obtained after step-up/step-down to the energy storage unit;
the energy storage unit is used for charging through the direct-current voltage signal after the voltage is increased/decreased, and supplying power to the on-line monitoring equipment.
Preferably, the rectifying circuit is one of a half-wave rectifying circuit, a full-wave rectifying circuit and a voltage doubling rectifying circuit.
Preferably, the step-up/step-down circuit is one of a Buck circuit, a Boost circuit and a Buck-Boost circuit.
Preferably, the energy storage unit is one of a super capacitor and a rechargeable button cell.
Preferably, the rectifying circuit selects a voltage doubler rectifying circuit.
Preferably, the voltage doubler rectifying circuit is a voltage doubler rectifying circuit.
Preferably, the step-up/step-down circuit selects a Buck circuit.
Preferably, the energy storage unit selects a rechargeable button cell.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an energy management circuit for on-line monitoring equipment of a power transformer, which comprises a rectifying circuit, a step-up/step-down circuit and an energy storage unit, wherein the rectifying circuit, the step-up/step-down circuit and the energy storage unit are sequentially connected, so that energy collected by an energy collecting device is converted into a working power supply of the on-line monitoring equipment, and the problems that input and output between the energy collecting device and the on-line monitoring equipment are not matched and working time cannot be continuous are solved. Compared with the traditional energy management circuit, the energy management circuit has the advantages of high-efficiency energy storage management function, stable output and relatively low hardware cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a general architecture diagram of an energy management circuit according to an embodiment of the present invention;
FIG. 2 is a topology of a half-wave rectification circuit according to an embodiment of the present invention;
FIG. 3 is a topology of a full wave rectifying circuit according to an embodiment of the present invention;
FIG. 4 is a topology of a voltage doubler rectifier circuit according to an embodiment of the present invention;
FIG. 5 is a circuit topology of a Buck converter according to an embodiment of the present invention;
FIG. 6 is a circuit topology of a Boost converter according to an embodiment of the present invention;
FIG. 7 is a circuit topology of a Buck-Boost converter according to an embodiment of the present invention;
fig. 8 is a circuit topology diagram of an energy management circuit according to an embodiment of the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
The embodiment of the invention provides an energy management circuit for on-line monitoring equipment of a power transformer, which comprises a rectifying circuit, a step-up/step-down circuit and an energy storage unit, wherein the rectifying circuit is connected with the step-up/step-down circuit;
the input end of the rectifying circuit is connected with the energy collecting device, and the output end of the rectifying circuit is connected with the input end of the step-up/step-down circuit; the output end of the step-up/step-down circuit is connected with the input end of the energy storage unit, and the output end of the energy storage unit is connected with the on-line monitoring equipment;
the rectification circuit is used for rectifying the output alternating voltage generated by the energy collecting device and inputting the direct-current voltage obtained after rectification into the step-up/step-down circuit;
the step-up/step-down circuit is used for carrying out step-up/step-down on the direct-current voltage obtained after rectification and inputting the direct-current voltage obtained after step-up/step-down to the energy storage unit;
the energy storage unit is used for charging through the direct-current voltage signal after the voltage is increased/decreased, and supplying power to the on-line monitoring equipment.
The working principle of the circuit of the invention is as follows:
the input end of the energy management circuit is an energy collection device, the output end of the energy management circuit is an on-line monitoring device of the power transformer, the energy collection device is connected with a rectifying circuit in the energy management circuit, output voltage generated by the energy collection device is rectified, voltage rising/dropping operation is carried out through a voltage rising/dropping circuit, collected electric energy is stored or released through an energy storage unit, and finally the energy collection device is connected with the on-line monitoring device to supply power.
The input end of the front stage of the rectifying circuit is connected with the output end of the energy collecting device, and the output alternating voltage generated by the energy collecting device is rectified, specifically one of a half-wave rectifying circuit, a full-wave rectifying circuit and a voltage doubling rectifying circuit.
As shown in fig. 2, the half-wave rectifying circuit is a common circuit for rectifying by utilizing the unidirectional conduction characteristic of a diode, and has the function of converting alternating current into direct current, that is, rectifying, because the direct current output after half-wave rectification is pulsating direct current, the half-wave rectifying circuit can only be used in simple circuits with low requirements on power supply, and is rarely used in practice. During the positive half cycle, diode D is in a forward biased state and conducts current to load R. A voltage is generated across the load which is the same as the input ac signal for the positive half cycle. Alternatively, during the negative half cycle, the diode is in a reverse biased state, no current flows through the diode, and the output voltage pulses a dc voltage.
As shown in fig. 3, the full-wave rectifying circuit is a circuit capable of converting ac into current in a single direction, and is formed by combining at least two rectifiers, one of which is responsible for the forward direction and one of which is responsible for the reverse direction, and the most typical full-wave rectifying circuit is a rectifying bridge composed of four diodes and is generally used for rectifying power. The waveform before and after full wave rectification is different from half wave rectification in that two half waves of alternating current are utilized in full wave rectification, which improves the efficiency of the rectifier and makes the rectified current easy to smooth. Full wave rectification is widely used in rectifiers. The power transformer of the full-wave rectifier must have a center tap when the full-wave rectifier is applied, so that the application range of the full-wave rectifier is relatively limited.
As shown in fig. 4, voltage doubler rectification is to store voltages on respective capacitors by rectification and guiding action of diodes, and then connect them in series according to the principle of polarity addition. The voltage doubling rectification can generate a higher direct current voltage by using a rectifying diode and a capacitor with higher withstand voltage. The voltage-doubling rectifying circuit is generally divided into a two-voltage-doubling rectifying circuit, a three-voltage rectifying circuit and a multi-voltage-doubling rectifying circuit.
In the embodiment of the invention, a double voltage rectifying circuit is selected.
The input end of the front stage of the step-up/step-down circuit is connected with the output end of the rectifying circuit, the step-up/step-down operation is carried out on the direct current voltage generated by the rectifying circuit, and the step-up/step-down circuit is one of a Buck circuit, a Boost circuit and a Buck-Boost circuit.
Buck, boost, buck-Boost, which is a widely used topology in dc switching power supplies, is a non-isolated dc converter of the type that intermittently applies a dc voltage to a load by on-off control of power electronics and changes the output voltage average by changing the duty cycle.
As shown in FIG. 5, the Buck (Buck) circuit is a non-isolated DC converter with an output voltage less than or equal to the input voltage. The main circuit of the Buck circuit is composed of a switching tube Q1, a diode D1, an output filter inductor L1 and an output filter capacitor C1. When the switching tube Q1 is turned on, the energy storage inductor L1 is magnetized, the current flowing through the inductor increases linearly, and simultaneously the capacitor C1 is charged to supply energy to the load R1. When the switching tube Q1 is turned off, the energy storage inductor L1 discharges through the freewheeling diode, the inductor current decreases linearly, and the output voltage is maintained by the discharge of the output filter capacitor C1 and the reduced inductor current. According to the volt-second balance principle, that is, under the steady working state of the switching power supply, the voltage applied to the two ends of the inductor is multiplied by the on time to be equal to the voltage of the two ends of the inductor at the off time and the off time, or the positive volt-second value of the two ends of the inductor in the steady working switching power supply is equal to the negative volt-second value, the relation between the output voltage and the input voltage of the Buck circuit can be obtained to be approximately equal toV out1 =V in1 ·D. D represents the duty cycle, and the same applies below.
As shown in fig. 6, the Boost circuit is a switching dc Boost circuit capable of converting dc power to another fixed voltage or variable voltageA direct current. The main circuit is composed of a switching tube Q2, a diode D2, an output filter inductor L2 and an output filter capacitor C2. When the switching tube Q2 is turned on, an input voltage flows through the inductor L2, the diode D2 prevents the capacitor C2 from discharging to ground, and the current on the inductor L2 increases linearly at a rate related to the magnitude of the inductor L2, and as the inductor current increases, some energy is stored in the inductor. When the switching tube Q2 is turned off, the current flowing through the inductor L2 does not immediately become 0 due to the current holding characteristic of the inductor L2, but slowly becomes 0 from the value when the charging is completed, and the original circuit is turned off, so that the inductor can only discharge through the new circuit, that is, the inductor L2 starts to charge the capacitor C2, and the voltage across the capacitor C2 increases, at this time, the voltage is already higher than the input voltage. And (5) finishing the boosting. If the on-off process is repeated, a voltage higher than the input voltage can be obtained at the two ends of the capacitor, and the relation between the output voltage and the input voltage of the Boost circuit can be obtained to be approximately equal toV out2 =V in2 /（1-D）。
As shown in fig. 7, the Buck-Boost circuit is also called Buck-Boost circuit, and is a single-tube non-isolated dc conversion circuit with an output voltage that can be lower than or higher than the input voltage, but the polarity of the output voltage is opposite to the input voltage. The Buck/Boost circuit can be regarded as a series connection of a Buck circuit and a Boost circuit, and is combined with a switch tube, so that the Buck/Boost circuit has the characteristics of both the Buck circuit and the Boost circuit, when the switch tube Q3 is conducted, because the diode D3 is reversely cut off, current flows to the inductor L3 and directly flows to the negative electrode of the power supply to form a loop with charging energy storage, when the switch tube Q3 is turned off, the inductor L3 becomes a power supply to supply power to the following circuit, the diode D3 forms an output loop, and the polarity of the output loop and the polarity of the power supply are opposite, so that the relation between the output voltage and the input voltage of the Buck-Boost circuit is approximately as followsV out3 =V in3 ·D/（1-D）。
For the embodiment of the invention, the output voltage of the step-up/step-down circuit is smaller than the input voltage, and meanwhile, the Buck circuit is adopted as the step-down converter in consideration of the efficiency of the converter.
The energy storage unit is connected with the output end of the step-up/step-down circuit, the energy storage unit is connected with the power input end of the on-line monitoring device, the direct current voltage output by the step-up/step-down circuit charges the energy storage unit, the on-line monitoring device is powered when the energy storage unit discharges, and the energy storage unit is one of a super capacitor and a rechargeable button cell.
The basic principle of the super capacitor is as follows: when the electrode is charged, the electrode surface charge in the ideal polarized electrode state attracts the foreign ions in the surrounding electrolyte solution, causing these ions to attach to the electrode surface to form an electric double layer, constituting an electric double layer capacitor. Because the distance between the two charge layers is very small (generally below 0.5 nm), and a special electrode structure is adopted, the surface area of the electrode is increased by ten thousand times, and thus, the extremely large capacitance is generated. The energy density of the super capacitor is hundreds of times that of the traditional capacitor, the power density is two orders of magnitude higher than that of the traditional battery, and the defects of low specific power, poor high-current charge and discharge performance and small energy density of the traditional capacitor are well overcome. The super capacitor has the advantages of long cycle life, quick charging characteristic, high power density, long service life, no maintenance and the like, but has the disadvantage that the price is relatively high compared with that of a common battery.
Rechargeable button cells, which are one type of electrical cell that can be charged, discharged to a load, and charged multiple times, consist of one or more electrochemical cells. The term "accumulator" is used because it accumulates and stores energy by reversible electrochemical reactions. Rechargeable batteries come in many different shapes and sizes, including button cell to megawatt systems connected to a stable power distribution network. Several different electrode materials and electrolyte combinations are used, including lead-acid, zinc air, nickel cadmium, nickel metal hydrides, lithium ions, lithium iron phosphate, and the like. Typically, rechargeable batteries are initially more costly than disposable batteries, but the total cost of ownership and impact on the environment is much lower, as they can be inexpensively recharged multiple times before replacement is required. Certain types of rechargeable batteries have the same size and voltage as disposable types and may be used interchangeably therewith.
Compared with the advantages and disadvantages of the super capacitor and the rechargeable battery, the energy storage unit provided by the embodiment of the invention adopts the rechargeable button battery, namely the secondary rechargeable button battery.
The rectifying circuit of the embodiment of the invention adopts a double-voltage rectifying circuit, the step-up/step-down circuit adopts a Buck circuit, and the energy storage module adopts a rechargeable button cell. As shown in fig. 8, the rectifying circuit, the step-up/step-down circuit and the energy storage module are connected in tandem to form an energy management circuit for the on-line monitoring device of the power transformer.
For the input conditions of different energy collecting devices, different rectifying circuits can be adopted in the energy management circuit; for the front and back input and output voltage of different step-up/step-down converters, different step-up/step-down conversion circuits can be adopted in the energy management circuit; meanwhile, in consideration of the output level of the step-up/down converter, the economy, the reliability and the like of the energy storage unit, different energy storage devices can be adopted in the energy management circuit.
The invention solves the problems that the input and output between the energy collecting device and the on-line monitoring equipment are not matched and the working time cannot be continuous. Compared with the traditional energy management circuit, the energy management circuit has the advantages of high-efficiency energy storage management function, stable output and relatively low hardware cost.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. An energy management circuit for an on-line monitoring device of a power transformer is characterized by comprising a rectifying circuit, a step-up/step-down circuit and an energy storage unit;
the input end of the rectifying circuit is connected with the energy collecting device, and the output end of the rectifying circuit is connected with the input end of the step-up/step-down circuit; the output end of the step-up/step-down circuit is connected with the input end of the energy storage unit, and the output end of the energy storage unit is connected with the on-line monitoring equipment;
the rectification circuit is used for rectifying the output alternating voltage generated by the energy collecting device and inputting the direct-current voltage obtained after rectification into the step-up/step-down circuit;
the step-up/step-down circuit is used for carrying out step-up/step-down on the direct-current voltage obtained after rectification and inputting the direct-current voltage obtained after step-up/step-down to the energy storage unit;
the energy storage unit is used for charging through the direct-current voltage signal after the voltage is increased/decreased, and supplying power to the on-line monitoring equipment.
2. The energy management circuit for an on-line monitoring device of a power transformer of claim 1, wherein the rectifying circuit is one of a half-wave rectifying circuit, a full-wave rectifying circuit, and a voltage doubler rectifying circuit.
3. The energy management circuit for an on-line monitoring device of a power transformer of claim 1, wherein the step-up/step-down circuit is one of a Buck circuit, a Boost circuit, and a Buck-Boost circuit.
4. The energy management circuit for an on-line monitoring device of a power transformer of claim 1, wherein the energy storage unit is one of a super capacitor and a rechargeable button cell.
5. The apparatus of claim 2, wherein the rectifying circuit is a voltage doubler rectifying circuit.
6. The apparatus of claim 5, wherein the voltage doubler rectifier circuit is a double voltage rectifier circuit.
7. A method according to claim 3, wherein the step-up/step-down circuit selects a Buck circuit.
8. A device according to claim 3, wherein the energy storage unit is a rechargeable button cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310758430.9A CN116885962A (en) | 2023-06-26 | 2023-06-26 | Energy management circuit for power transformer on-line monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310758430.9A CN116885962A (en) | 2023-06-26 | 2023-06-26 | Energy management circuit for power transformer on-line monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116885962A true CN116885962A (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310758430.9A Pending CN116885962A (en) | 2023-06-26 | 2023-06-26 | Energy management circuit for power transformer on-line monitoring equipment |
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| Country | Link |
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| CN (1) | CN116885962A (en) |
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2023
- 2023-06-26 CN CN202310758430.9A patent/CN116885962A/en active Pending
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