CN220234259U - Capacitor charging circuit and ammeter - Google Patents
Capacitor charging circuit and ammeter Download PDFInfo
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- CN220234259U CN220234259U CN202321900596.1U CN202321900596U CN220234259U CN 220234259 U CN220234259 U CN 220234259U CN 202321900596 U CN202321900596 U CN 202321900596U CN 220234259 U CN220234259 U CN 220234259U
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- 125000004122 cyclic group Chemical group 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 27
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Abstract
The utility model discloses a capacitor charging circuit and an ammeter. The capacitor charging circuit comprises a power supply end, a current output control loop, a voltage control module, a current anti-reverse-filling module and an energy storage capacitor; the input end of the current output control loop is connected with the power supply end, the output end of the current output control loop is connected with the first end of the current-preventing reverse-filling module, the second end of the current-preventing reverse-filling module is connected with the first end of the energy storage capacitor, the second end of the energy storage capacitor is grounded, and the current output control loop is used for carrying out cyclic amplification control on current input by the power supply end and outputting charging current to the energy storage capacitor for quick charging. According to the capacitor charging circuit, through adding the current output control loop, the charging current input to the energy storage capacitor can be amplified, the charging current is increased continuously along with the extension of the charging time, the charging speed of the energy storage capacitor is obviously increased, and the charging time is shortened.
Description
Technical Field
The utility model relates to the technical field of electric meters, in particular to a capacitor charging circuit and an electric meter.
Background
When the power grid fault or the abnormal electricity meter causes sudden power failure, the electricity meter needs to report the sudden power failure event through the communication module, and the power failure reporting function is beneficial to timely acquiring the power supply network fault and is convenient to conduct problem investigation and maintenance. When the ammeter is powered down, the ammeter needs to supply power for the communication module by utilizing the energy storage module so as to support the ammeter to report the power failure. In the prior art, the Faraday capacitor is usually used for storing energy, but power failure in some areas is frequent, if power failure reporting is required to be accurately carried out, the Faraday capacitor is required to be filled rapidly in a short time, but the power supply capacity of the ammeter for the communication module is limited, and the charging current which is not too large is output, so that the quick charging requirement of the Faraday capacitor cannot be met.
Disclosure of Invention
The embodiment of the utility model provides a capacitor charging circuit and an ammeter, which are used for solving the problem that the ammeter has limited power supply capacity and cannot meet the requirement of quick charging of a Farad capacitor.
The utility model provides a capacitor charging circuit which comprises a power supply end, a current output control loop, a voltage control module, a current reverse-filling prevention module and an energy storage capacitor, wherein the power supply end is connected with the voltage control module;
the input end of the current output control loop is connected with the power supply end, the output end of the current output control loop is connected with the first end of the current anti-reverse-filling module, the second end of the current anti-reverse-filling module is connected with the first end of the energy storage capacitor, the second end of the energy storage capacitor is grounded, and the current output control loop is used for carrying out cyclic amplification control on the current input by the power supply end and outputting charging current to the energy storage capacitor;
the input end of the voltage control module is connected with the connection node between the current output control loop and the energy storage capacitor, the output end of the voltage control module is grounded and used for detecting the actual measurement voltage of the energy storage capacitor, and when the actual measurement voltage reaches the preset voltage, the current output control loop is controlled to stop charging the energy storage capacitor.
Preferably, the current output control loop comprises a first control tube and a second control tube;
the first end of the first control tube is connected with the power supply end, the second end of the first control tube is grounded, the third end of the first control tube is connected with the first end of the current reverse-filling prevention module, and the first control tube is used for outputting charging current to the energy storage capacitor;
the first end of the second control tube is connected with the power supply end, the second end of the second control tube is connected with the third end of the first control tube, and the third end of the second control tube is connected with the second end of the first control tube and the ground, so that the second control tube and the first control tube form a current amplifying loop.
Preferably, the current output control loop further comprises a first resistor;
the first end of the first resistor is connected with the power supply end, and the second end of the first resistor is connected with the first end of the first control tube.
Preferably, the anti-current reverse-filling module comprises a diode;
the anode of the diode is connected with the third end of the first control tube, and the cathode of the diode is connected with the energy storage capacitor.
Preferably, the current output control loop further comprises a second resistor and a third resistor;
the first end of the second resistor is connected with the third end of the first control tube, and the second end of the second resistor is connected with the second end of the second control tube;
the first end of the third resistor is connected with a connecting node between the second end of the first control tube and the third end of the second control tube, and the second end of the third resistor is grounded.
Preferably, the voltage control module comprises a voltage stabilizing tube, a fourth resistor and a fifth resistor;
the fourth resistor and the fifth resistor are connected in series at two ends of the energy storage capacitor;
the first end of the voltage stabilizing tube is connected with the third end of the first control tube, the second end of the voltage stabilizing tube is connected with a connecting node between the fourth resistor and the fifth resistor, and the third end of the voltage stabilizing tube is grounded.
Preferably, the capacitor charging circuit further comprises a sixth resistor;
the first end of the sixth resistor is connected with the third end of the first control tube, and the second end of the sixth resistor is connected with the first end of the voltage stabilizing tube.
Preferably, the capacitor charging circuit further comprises a seventh resistor;
the first end of the seventh resistor is connected with the connection node between the power supply end and the first control tube, and the second end of the seventh resistor is connected with the first end of the voltage stabilizing tube.
Preferably, the energy storage capacitor is a faraday capacitor.
The utility model also provides an ammeter which comprises a power failure event reporting module and the capacitor charging circuit;
the energy storage capacitor is connected with the power failure event reporting module and is used for supplying power to the power failure event reporting module when the power supply end fails.
According to the capacitor charging circuit and the ammeter disclosed by the embodiment of the utility model, through adding the current output control loop, the charging current input to the energy storage capacitor can be amplified, the charging current is continuously increased along with the extension of the charging time, the charging speed of the energy storage capacitor is obviously accelerated, the charging time is shortened, and the ammeter is ensured to accurately report a power failure event when power failure is frequent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a capacitor charging circuit according to an embodiment of the utility model.
In the figure: 1. a current output control loop; 2. a voltage control module; 3. a current-proof reverse-filling module; 4. and a power failure event reporting module.
Detailed Description
The following description of the embodiments of the present utility model 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 utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.
It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.
Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, 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. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
The embodiment of the utility model provides a capacitor charging circuit, which comprises a power supply end VCC, a current output control loop 1, a voltage control module 2, a current reverse-filling prevention module 3 and an energy storage capacitor C1; the input end of the current output control loop 1 is connected with the power supply end VCC, the output end of the current output control loop 1 is connected with the first end of the current anti-reverse-filling module 3, the second end of the current anti-reverse-filling module 3 is connected with the first end of the energy storage capacitor C1, the second end of the energy storage capacitor C1 is grounded, and the current output control loop 1 is used for carrying out cyclic amplification control on the current input by the power supply end VCC and outputting charging current to the energy storage capacitor C1 for quick charging; the input end of the voltage control module 2 is connected with a connecting node between the current output control loop 1 and the energy storage capacitor C1, and the output end of the voltage control module 2 is grounded and used for detecting the actual measurement voltage of the energy storage capacitor C1, and when the actual measurement voltage reaches a preset voltage, the current output control loop 1 is controlled to stop charging the energy storage capacitor C1.
As an example, the capacitor charging circuit includes a power supply terminal VCC, a current output control loop 1, a voltage control module 2, a current anti-reverse-filling module 3, and an energy storage capacitor C1. The input end of the current output control loop 1 is connected with the power supply end VCC, the output end of the current output control loop 1 is connected with the first end of the current reverse-filling prevention module 3, the second end of the current reverse-filling prevention module 3 is connected with the first end of the energy storage capacitor C1, and the second end of the energy storage capacitor C1 is grounded. The current anti-reverse-filling module 3 can prevent the energy storage capacitor C1 from generating current reverse-filling damage to the current output control loop 1 in the charging process or when the power supply end VCC is powered down. The input end of the voltage control module 2 is connected with a connecting node between the current output control loop 1 and the energy storage capacitor C1, and the output end of the voltage control module 2 is grounded. In this example, the power supply end VCC of the capacitor charging circuit is configured to provide a power supply current for the energy storage capacitor C1, the power supply current output by the power supply end VCC is input into the current output control loop 1 and amplified multiple times in the current output control loop 1, so that the output charging current is continuously increased along with the extension of the charging time, the charging speed of the energy storage capacitor C1 is increased, the voltage control module 2 is configured to detect the measured voltage of the energy storage capacitor C1, and when the measured voltage reaches a preset voltage, the current output control loop 1 is pulled down to ground, so that the control current output control loop 1 stops charging the energy storage capacitor C1. In this embodiment, the current output control loop 1 is added to the capacitor charging circuit, so that the charging current input to the energy storage capacitor C1 by the power supply terminal VCC can be amplified, and the charging current is amplified in the current output control loop 1 for multiple times, so that the charging current is increased continuously along with the extension of the charging time, the charging speed of the energy storage capacitor C1 is obviously accelerated, and the charging time is shortened.
In one embodiment, the current output control loop 1 includes a first control tube Q1 and a second control tube Q2; the first end of the first control tube Q1 is connected with the power supply end VCC, the second end of the first control tube Q1 is grounded, the third end of the first control tube Q1 is connected with the first end of the current reverse-filling prevention module 3, and the first control tube Q1 is used for outputting charging current to the energy storage capacitor C1; the first end of the second control tube Q2 is connected with the power supply end VCC, the second end of the second control tube Q2 is connected with the third end of the first control tube Q1, the third end of the second control tube Q2 is connected with the second end of the first control tube Q1 and the ground, and the second control tube Q2 and the first control tube Q1 form a current amplifying loop.
As an example, as shown in fig. 1, the current output control loop 1 includes a first control tube Q1 and a second control tube Q2, where the first control tube Q1 and the second control tube Q2 may be PNP transistors. The emitter of the first control tube Q1 is connected with the power supply end VCC, the base electrode of the first control tube Q1 is grounded, and the collector of the first control tube Q1 is connected with the first end of the current reverse-filling prevention module 3. The emitter of the second control tube Q2 is connected with the power supply end VCC, the base electrode of the second control tube Q2 is connected with the collector electrode of the first control tube Q1, and the collector electrode of the second control tube Q2 is simultaneously connected with the base electrode of the first control tube Q1 and the ground. When the power supply terminal VCC inputs current, due to the voltage U between the emitter and the base of the second control tube Q2 EB Is larger than the conduction voltage of the second control tube Q2 and the voltage U between the emitter and the base of the first control tube Q1 EB ' conduction electricity larger than second control tube Q2The second control tube Q2 is conducted with the first control tube Q1, and the collector of the second control tube Q2 and the collector of the first control tube Q1 have smaller current to pass, but the collector of the second control tube Q2 is connected with the base of the first control tube Q1 and grounded, so that the base voltage U of the first control tube Q1 can be applied to B ' pull-down function is performed to enable the second control tube Q2 to work in the amplifying region, and the current I after amplifying is output by the collector electrode of the second control tube Q2 C 'A'; at the same time, the collector of the first control tube Q1 is connected with the base of the second control tube Q2, and the base voltage U of the first control tube Q1 is also controlled B The base electrode of the second control tube Q2 is led to output current I B Increase and further make the collector electrode of the second control tube Q2 output current I C Increase the output current I after increase C Continuously pull down the base voltage of the first control tube Q1 to further enable the collector electrode of the second control tube Q2 to output current I C ' increase, form the current circulation and amplify the control, reach the effect that the charging current that the second control tube Q2 exports to energy storage capacitor C1 increases constantly along with the time extension.
In one embodiment, the current output control loop 1 further includes a first resistor R1; the first end of the first resistor R1 is connected to the power supply end VCC, and the second end of the first resistor R1 is connected to the first end of the first control tube Q1.
As an example, the current output control loop 1 further includes a first resistor R1 disposed between the power supply terminal VCC and the first control tube Q1, where a first end of the first resistor R1 is connected to the power supply terminal VCC, and a second end of the first resistor R1 is connected to the emitter of the first control tube Q1, where the first resistor R1 may be a single resistor or at least two resistors disposed in parallel. The first resistor R1 is added between the power supply end VCC and the emitter of the first control tube Q1 to play a role in limiting current, prevent the triode from being damaged due to overlarge current, play a role in voltage division and control the emitter voltage U of the first control tube Q1 E '。
In one embodiment, the anti-current reverse-filling module 3 includes a diode D1; an anode of the diode D1 is connected with a third end of the first control tube Q1, and a cathode of the diode D1 is connected with the energy storage capacitor C1.
As an example, the anti-current back-filling module 3 includes a diode D1. The positive pole of diode D1 links to each other with the third end of first control tube Q1, and diode D1's negative pole links to each other with energy storage capacitor C1, prevents that energy storage capacitor C1 from producing the electric current reverse-filling damage triode when charging process or power supply end VCC fall the power.
In one embodiment, the current output control loop 1 further includes a second resistor R2 and a third resistor R3; the first end of the second resistor R2 is connected with the third end of the first control tube Q1, and the second end of the second resistor R2 is connected with the second end of the second control tube Q2; the first end of the third resistor R3 is connected with a connection node between the second end of the first control tube Q1 and the third end of the second control tube Q2, and the second end of the third resistor R3 is grounded.
As an example, the current output control loop 1 further includes a second resistor R2 and a third resistor R3, where a first end of the second resistor R2 is connected to the third end of the first control tube Q1, and a second end of the second resistor R2 is connected to the second end of the second control tube Q2; the first end of the third resistor R3 is connected with a connection node between the second end of the first control tube Q1 and the third end of the second control tube Q2, and the second end of the third resistor R3 is grounded. In the process of conducting the first control tube Q1 and the second control tube Q2, the second control tube Q2 can be conducted first and generate output current I at the collector due to the existence of the first resistor R1 C At this time, the third resistor R3 plays a role of pulling down to make the base current I of the first control tube Q1 B ' rising, the first control tube Q1 works in the amplifying region, the output current I of the collector of the first control tube Q1 C ' also rises with it, collector voltage U of first control tube Q1 during charging C ' gradually climb the base output current I of the second control tube Q2 B The second resistor R2 plays a role in limiting current, so that the output current of the base electrode of the second control tube Q2 is kept in a moderate range, and the transistor is prevented from being damaged due to overlarge current amplification. Along with the gradual rise of the voltage at the two ends of the energy storage capacitor C1, the voltage U between the emitter and the collector of the first control tube Q1 EC ' gradually decreasing, so that the first control tube Q1 works in a saturated state, and the charging current is reduced; when the measured voltages at the two ends of the energy storage capacitor C1 reach the preset voltage, the second control tube Q2 is collectedElectrode output current I C Further increase the collector voltage U C Further increase of the base voltage U of the first control tube Q1 B ' also rises and is greater than the emitter voltage U of the first control tube Q1 E ' the first control tube Q1 is turned off, stopping charging the energy storage capacitor C1.
In one embodiment, the voltage control module 2 includes a regulator D2, a fourth resistor R4, and a fifth resistor R5; the fourth resistor and the fifth resistor are arranged at two ends of the energy storage capacitor C1 in series, the first end of the voltage stabilizing tube D2 is connected with the third end of the first control tube Q1, the second end of the voltage stabilizing tube D2 is connected with a connecting node between the fourth resistor R4 and the fifth resistor R5, and the third end of the voltage stabilizing tube D2 is grounded.
As an example, the voltage control module 2 includes a regulator tube D2, a fourth resistor R4, and a fifth resistor R5, where the regulator tube D2 is preferably a TL431 regulator tube D2. The first end of the fourth resistor R4 is connected with the first end of the energy storage capacitor C1, the second end of the fourth resistor R4 is connected with the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected with the second end of the energy storage capacitor C1 and grounded. The cathode of the voltage stabilizing tube D2 is connected with the third end of the first control tube Q1, the reference end of the voltage stabilizing tube D2 is connected with a connecting node between the fourth resistor R4 and the fifth resistor R5, and the anode of the voltage stabilizing tube D2 is grounded. In the process of charging the energy storage capacitor C1, the voltages at the two ends of the energy storage capacitor C1 continuously rise, the voltages at the two ends of the fourth resistor R4 and the fifth resistor R5 also continuously rise, and when the voltage at the two ends of the fifth resistor R5 rises to be the same as the reference voltage of the voltage stabilizing tube D2, the voltage stabilizing tube D2 is reversely conducted to enable the collector voltage U of the first control tube Q1 to be the same as the reference voltage of the voltage stabilizing tube D2 C ' pull-down to ground, causing collector of first control tube Q1 to output current I C ' flows into the ground wire through the voltage stabilizing tube D2, and stops charging the energy storage capacitor C1, so that the current output control loop 1 completely stops charging.
In an embodiment, the voltage control module 2 further includes a sixth resistor R6; the first end of the sixth resistor R6 is connected with the third end of the first control tube Q1, and the second end of the sixth resistor R6 is connected with the first end of the voltage stabilizing tube D2.
As an example, the voltage control module 2 further includes a sixth resistor R6, a first resistor R6The end is connected with the collector of the first control tube Q1, the second end of the sixth resistor R6 is connected with the cathode of the voltage stabilizing tube D2, the current limiting effect can be further realized by adding the sixth resistor R6, and the collector voltage U of the first control tube Q1 is prevented when the voltage stabilizing tube D2 is conducted C Base voltage U of' and second control tube Q2 B The abrupt change causes the misleading current of the first control tube Q1 to flow through the regulator tube D2, which causes damage to the regulator tube D2.
In an embodiment, the voltage control module 2 further includes a seventh resistor R7; the first end of the seventh resistor R7 is connected with the connection node between the power supply end VCC and the first control tube Q1, and the second end of the seventh resistor R7 is connected with the first end of the voltage stabilizing tube D2.
As an example, the voltage control module 2 further includes a seventh resistor R7. The first end of the seventh resistor R7 is connected with the connection node between the power supply end VCC and the first control tube Q1, and the second end of the seventh resistor R7 is connected with the cathode of the voltage stabilizing tube D2. By adding the seventh resistor R7, the voltage stabilizing tube D2 and the second control tube Q2 form a stable current loop after being turned off, so that the first control tube Q1 is continuously in a cut-off state, and the energy storage capacitor C1 is not charged.
In one embodiment, the storage capacitor C1 is a faraday capacitor.
As an example, the energy storage capacitor C1 is preferably a faraday capacitor, which has a higher capacity than a normal capacitor, a long cycle life, a strong discharge capacity of a large current, and a high energy conversion efficiency.
The embodiment of the utility model also provides an ammeter which comprises a power failure event reporting module 4 and the capacitor charging circuit in any one of the embodiments; the energy storage capacitor C1 is connected with the power failure event reporting module 4 and is used for supplying power to the power failure event reporting module 4 when the power supply end VCC fails.
As an example, the electric meter includes a power failure event reporting module 4, configured to communicate with an upper computer when the electric meter is powered off, and send power failure reporting information. The energy storage capacitor C1 in the capacitor charging circuit is connected with the power failure event reporting module 4, the power supply end VCC of the ammeter is connected with the power supply end VCC in the capacitor charging circuit, and the direct current voltage obtained after rectifying and filtering the commercial power alternating current voltage is output to the capacitor charging circuit. When the electric meter normally accesses the mains supply alternating voltage, the power supply end VCC supplies power to the capacitor charging circuit, and the current output control loop 1 in the capacitor charging circuit amplifies the power supply current input by the power supply end VCC in the loop for a plurality of times, so that the output charging current is continuously increased along with the extension of the charging time, and the charging speed of the energy storage capacitor C1 is increased. The voltage control module 2 in the capacitor charging circuit is used for detecting the actual measurement voltage of the energy storage capacitor C1, and pulling the actual measurement voltage to the ground when the actual measurement voltage reaches the preset voltage, so that the control current output control loop 1 stops charging the energy storage capacitor C1. When the electricity meter is powered down without being connected with the alternating voltage of the mains supply, the energy storage capacitor C1 which is charged can supply power to the power failure event reporting module 4, support the communication between the energy storage capacitor C1 and an upper computer, and send power failure reporting information.
In this example, by adding the current output control loop 1, the charging current input to the energy storage capacitor C1 can be amplified, and the charging current is increased continuously with the increase of the charging time, so that the charging speed of the energy storage capacitor C1 is significantly increased, and the charging time is shortened.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model 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 technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. The capacitor charging circuit is characterized by comprising a power supply end, a current output control loop, a voltage control module, a current anti-reverse-filling module and an energy storage capacitor;
the input end of the current output control loop is connected with the power supply end, the output end of the current output control loop is connected with the first end of the current anti-reverse-filling module, the second end of the current anti-reverse-filling module is connected with the first end of the energy storage capacitor, the second end of the energy storage capacitor is grounded, and the current output control loop is used for carrying out cyclic amplification control on the current input by the power supply end and outputting charging current to the energy storage capacitor;
the input end of the voltage control module is connected with the connection node between the current output control loop and the energy storage capacitor, the output end of the voltage control module is grounded and used for detecting the actual measurement voltage of the energy storage capacitor, and when the actual measurement voltage reaches the preset voltage, the current output control loop is controlled to stop charging the energy storage capacitor.
2. The capacitive charging circuit of claim 1, wherein the current output control loop comprises a first control tube and a second control tube;
the first end of the first control tube is connected with the power supply end, the second end of the first control tube is grounded, the third end of the first control tube is connected with the first end of the current reverse-filling prevention module, and the first control tube is used for outputting charging current to the energy storage capacitor;
the first end of the second control tube is connected with the power supply end, the second end of the second control tube is connected with the third end of the first control tube, and the third end of the second control tube is connected with the second end of the first control tube and the ground, so that the second control tube and the first control tube form a current amplifying loop.
3. The capacitive charging circuit of claim 2, wherein the current output control loop further comprises a first resistor;
the first end of the first resistor is connected with the power supply end, and the second end of the first resistor is connected with the first end of the first control tube.
4. The capacitive charging circuit of claim 2, wherein the anti-current back-filling module comprises a diode;
the anode of the diode is connected with the third end of the first control tube, and the cathode of the diode is connected with the energy storage capacitor.
5. The capacitive charging circuit of claim 2, wherein the current output control loop further comprises a second resistor and a third resistor;
the first end of the second resistor is connected with the third end of the first control tube, and the second end of the second resistor is connected with the second end of the second control tube;
the first end of the third resistor is connected with a connecting node between the second end of the first control tube and the third end of the second control tube, and the second end of the third resistor is grounded.
6. The capacitive charging circuit of claim 2, wherein the voltage control module comprises a regulator tube, a fourth resistor, and a fifth resistor;
the fourth resistor and the fifth resistor are connected in series at two ends of the energy storage capacitor;
the first end of the voltage stabilizing tube is connected with the third end of the first control tube, the second end of the voltage stabilizing tube is connected with a connecting node between the fourth resistor and the fifth resistor, and the third end of the voltage stabilizing tube is grounded.
7. The capacitive charging circuit of claim 6, wherein the capacitive charging circuit further comprises a sixth resistor;
the first end of the sixth resistor is connected with the third end of the first control tube, and the second end of the sixth resistor is connected with the first end of the voltage stabilizing tube.
8. The capacitive charging circuit of claim 6, wherein the capacitive charging circuit further comprises a seventh resistor;
the first end of the seventh resistor is connected with the connection node between the power supply end and the first control tube, and the second end of the seventh resistor is connected with the first end of the voltage stabilizing tube.
9. The capacitor charging circuit of claim 1, wherein the energy storage capacitor is a faraday capacitor.
10. An electricity meter comprising a power down event reporting module and the capacitor charging circuit of any one of claims 1-9;
the energy storage capacitor is connected with the power failure event reporting module and is used for supplying power to the power failure event reporting module when the power supply end fails.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321900596.1U CN220234259U (en) | 2023-07-19 | 2023-07-19 | Capacitor charging circuit and ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321900596.1U CN220234259U (en) | 2023-07-19 | 2023-07-19 | Capacitor charging circuit and ammeter |
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| Publication Number | Publication Date |
|---|---|
| CN220234259U true CN220234259U (en) | 2023-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321900596.1U Active CN220234259U (en) | 2023-07-19 | 2023-07-19 | Capacitor charging circuit and ammeter |
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| Country | Link |
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| CN (1) | CN220234259U (en) |
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