CN220711336U - BUCK power supply circuit of ammeter - Google Patents
BUCK power supply circuit of ammeter Download PDFInfo
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- CN220711336U CN220711336U CN202322010451.0U CN202322010451U CN220711336U CN 220711336 U CN220711336 U CN 220711336U CN 202322010451 U CN202322010451 U CN 202322010451U CN 220711336 U CN220711336 U CN 220711336U
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- 239000003990 capacitor Substances 0.000 claims abstract description 80
- 101100503482 Arabidopsis thaliana FTSH5 gene Proteins 0.000 claims abstract description 14
- 101150082136 VAR1 gene Proteins 0.000 claims abstract description 14
- 230000001419 dependent effect Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims 3
- 238000004146 energy storage Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of ammeter power supplies, and discloses a BUCK power supply circuit of an ammeter, which comprises a thermistor RT1, wherein one end of the thermistor RT1 is connected with one end of a first piezoresistor VAR1 and then is connected with a zero line N, the other end of the thermistor RT1 is connected with one end of a second capacitor C2 and then is connected with an anode of a first diode D1, a cathode of the first diode D1 is connected with an anode of a second diode D2, a cathode of the second diode D2 is connected with one end of a first inductor L1, and the other end of the first inductor L1 is connected with one end of the first resistor R1, an anode end of the first resistor C1, a seventh pin of a first chip U1 and an eighth pin of the first chip U1 together; the utility model has simple circuit and small volume, and can start lightning protection overcurrent protection.
Description
Technical Field
The utility model relates to the technical field of ammeter power supplies, in particular to a BUCK power supply circuit of an ammeter.
Background
With the increasing development of communication technology in the current market, the electric energy meter is more and more capable of supporting modules, wherein the management of an external interface power supply is particularly important, and the existing design is to turn off the back end output by closing the DCDC enabling pin so as to achieve the purpose of protecting the interface power supply. However, for the scheme that the ammeter is a module path feedback power supply, that is, when the switching power supply is designed, because the module path is a heavy load path, a designer generally considers that the path is taken as a power supply feedback path, the power supply feedback path is relatively complex in design, large in size and large in power consumption, and cannot reach a protection state.
Disclosure of Invention
The utility model aims to provide a BUCK power circuit of an ammeter, which aims to solve the problems that the ammeter in the prior art is large in power supply volume, large in devices and power consumption and difficult to protect.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a BUCK power supply circuit of ammeter, including thermistor RT1, be connected with zero line N after thermistor RT 1's one end and the one end of first piezo-resistor VAR1, thermistor RT 1's the other end is connected with the one end of second electric capacity C2 and is connected with the positive pole of first diode D1, the negative pole of first diode D1 is connected with the positive pole of second diode D2, the negative pole of second diode D2 is connected with one end of first inductance L1, the other end of first inductance L1 is connected with one end of first resistance R1, the positive pole of first electric capacity C1, the seventh pin of first chip U1 and the eighth pin of first chip U1 together;
the other end of the first resistor R1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4, the cathode end of the first capacitor C1 and one end of a third resistor R3 are commonly connected with the anode end of an eighth capacitor C8, and the other end of the third resistor R3 is connected with one end of a fifth ground resistor R5;
the other end of the first voltage dependent resistor VAR1, the other end of the second voltage dependent resistor RV, the other end of the second capacitor C2, the cathode end of the eighth capacitor C8 and the other end of the fifth resistor R5 are all connected with the live wire N and grounded GND;
the fourth pin of the first chip U1 is sequentially connected with one end of the third capacitor C3, one end of the fifth capacitor C5 and the cathode of the third diode D3, the anode of the third diode D3 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is respectively connected with one end of the second inductor L2, the anode end of the seventh capacitor C7, one end of the fourth capacitor C4 and one end of the sixth capacitor C6 and is connected with the power supply VCC;
the other end of the third capacitor C3 is connected to the first pin of the first chip U1, the second pin of the first chip U1, the other end of the fifth capacitor C5, the cathode of the fourth diode D4, and the other end of the second inductor L2, respectively, and the anode of the fourth diode D4 is connected to the cathode end of the seventh capacitor, the other end of the fourth capacitor C4, and the other end of the sixth capacitor C6, and is grounded GND.
Preferably, in this embodiment, the device model of the thermistor RT1 is any one of WMZY1-211C, WMZ91, WMZ92 and WMZ 93.
Preferably, in the present technical solution, the varistor VAR1 is any one of 20D510, 20D420 and 20D 680.
Preferably, in this technical solution, the first capacitor C1 and the eighth capacitor C8 are both high-voltage capacitors, and the device specifications are the same.
Preferably, in the present technical solution, the capacitance value of the third capacitor C3 is 4.7uF;
the capacitance value of the fifth capacitor C5 is 100nF;
the capacitance value of the seventh capacitor C7 is 470uF.
Preferably, in the present technical solution, the resistance values of the first resistor R1, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are the same, and are all 300kΩ.
Preferably, in this technical solution, the resistance value of the second resistor R2 is 47 Ω.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model has simple circuit and small volume, and can start lightning protection overcurrent protection.
1. In the utility model, the first voltage dependent resistor VAR1 and the second voltage dependent resistor RV form a front end protection circuit of the thermistor RT1, and the first voltage dependent resistor VAR1 plays roles in preventing surge and lightning stroke, and the thermistor RT1 plays roles in preventing overcurrent, so that the power supply circuit has a protection function through a simple electronic device and is small in size.
2. In the utility model, the first inductor L1, the first capacitor C1 and the eighth capacitor C8 are used as front-end energy storage units, the second inductor L2 and the seventh capacitor C7 are used as rear-end energy storage units, and the first resistor R1, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are used for balancing the energy storage of the first chip U2 and the front end, so that the charge and discharge power supply function is realized, and the charge and discharge power supply device is a simple device and has low power consumption.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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.
Referring to fig. 1, a BUCK power circuit of an ammeter includes a thermistor RT1, wherein one end of the thermistor RT1 is connected with one end of a first varistor VAR1 and then connected with a zero line N, the other end of the thermistor RT1 is connected with one end of a second capacitor C2 and then connected with an anode of a first diode D1, a cathode of the first diode D1 is connected with an anode of a second diode D2, a cathode of the second diode D2 is connected with one end of a first inductor L1, and the other end of the first inductor L1 is connected with one end of a first resistor R1, an anode end of the first capacitor C1, a seventh pin of a first chip U1 and an eighth pin of the first chip U1 together;
the other end of the first resistor R1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4, the cathode end of the first capacitor C1 and one end of a third resistor R3 are connected with the anode end of an eighth capacitor C8 together, and the other end of the third resistor R3 is connected with one end of a fifth ground resistor R5;
the other end of the first voltage dependent resistor VAR1, the other end of the second voltage dependent resistor RV, the other end of the second capacitor, the cathode end of the eighth capacitor C8 and the other end of the fifth resistor R5 are all connected with the live wire N and grounded GND;
the fourth pin of the first chip U1 is sequentially connected with one end of a third capacitor C3, one end of a fifth capacitor C5 and a cathode of a third diode D3, an anode of the third diode D3 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is respectively connected with one end of a second inductor L2, an anode end of a seventh capacitor C7, one end of a fourth capacitor C4 and one end of a sixth capacitor C6 and is connected with a power supply VCC;
the other end of the third capacitor C3 is respectively connected with the first pin of the first chip U1, the second pin of the first chip U1, the other end of the fifth capacitor C5, the cathode of the fourth diode D4 and the other end of the second inductor L2, and the anode of the fourth diode D4 is connected with the cathode end of the seventh capacitor, the other end of the fourth capacitor C4 and the other end of the sixth capacitor C6 and grounded GND.
Preferably, the thermistor RT1 is any one of WMZY1-211C, WMZ, WMZ92 and WMZ93, but is not limited to the examples shown in the present utility model.
Preferably, the varistor VAR1 is any one of the types 20D510, 20D420 and 20D680, but not limited to the examples shown in the present utility model.
Preferably, the first capacitor C1 and the eighth capacitor C8 are both high-voltage capacitors, and the standard capacitance values of the first capacitor C1 and the eighth capacitor C8 are the same, and may be any of 450V/6.8uF, 450V/10uF and 450V/22uF, but not limited to the embodiments of the present utility model.
Preferably, the specification type of the first chip U1 may be any of 8231, H, viper12 and TNY27x series, but is not limited to the examples of the present utility model.
The circuit principle of the utility model is described as follows:
the basic working principle and the process of the power supply circuit are the process of charging and discharging the inductor L2 and the capacitor C7. Specifically, when the front end (L, N) has an ac voltage input, the ac voltage flows through the thermistor RT1 and then is rectified by the first diode D1 and the second diode D2, the first inductor L1 and the first capacitor C1 and the eighth capacitor C8 store energy, the seventh pin and the eighth pin (internal SW pin) of the first chip U1 are turned on and off by PWM, when the seventh pin and the eighth pin (internal SW pin) of the first chip U1 are turned on, the second inductor L2 and the seventh capacitor C7 store energy and directly output the power VCC, and when the internal SW pin of the first chip U1 is turned off, the second inductor L2 and the seventh capacitor C7 release energy to continue to supply the power to the output power VCC; when the load at the rear end of the power supply VCC changes, the load is fed back to the first chip U1 through the second resistor R2 and the third diode D3, and the first chip U1 adjusts the switching frequency of the internal SW according to the fed-back signal, so that the power supply VCC at the rear end can obtain stable voltage output; when the alternating current at the front end is powered off, the second inductor L2 and the seventh capacitor C7 release energy, and the power can be continuously supplied to the rear end for a certain time (the capacity of the first capacitor C1 and the eighth capacitor C8 is increased, and the power supply time at the rear end after power off can be increased).
In the circuit of fig. 1, the first varistor VAR1 and the second varistor RV form a front-end protection circuit of the thermistor RT1, and the first varistor VAR1 plays roles in preventing surge and lightning strike, and the thermistor RT1 plays roles in preventing overcurrent. The second capacitance C2 is a filtering and EMC (electromagnetic compatibility) improving effect; the first diode D1 and the second diode D2 play a role in rectification; the first inductor L1, the first capacitor C1 and the eighth capacitor C8 are used as front-end energy storage units, the second inductor L2 and the seventh capacitor C7 are rear-end energy storage units, and the first resistor R1, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are used for balancing the energy storage of the first chip U2 and the front end; the first chip U1 is a switch; and the fourth capacitor C4 and the sixth capacitor C6 are used for circuit filtering.
In conclusion, the lightning protection circuit is simple, small in size and small in power, and lightning protection overcurrent protection can be started.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The BUCK power supply circuit of the ammeter is characterized by comprising a thermistor RT1, wherein one end of the thermistor RT1 is connected with one end of a first piezoresistor VAR1 and then is connected with a zero line N, the other end of the thermistor RT1 is connected with one end of a second capacitor C2 and then is connected with an anode of a first diode D1, a cathode of the first diode D1 is connected with an anode of a second diode D2, a cathode of the second diode D2 is connected with one end of a first inductor L1, and the other end of the first inductor L1 is connected with one end of a first resistor R1, an anode end of the first capacitor C1, a seventh pin of a first chip U1 and an eighth pin of the first chip U1 together;
the other end of the first resistor R1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4, the cathode end of the first capacitor C1 and one end of a third resistor R3 are commonly connected with the anode end of an eighth capacitor C8, and the other end of the third resistor R3 is connected with one end of a fifth ground resistor R5;
the other end of the first voltage dependent resistor VAR1, the other end of the second voltage dependent resistor RV, the other end of the second capacitor C2, the cathode end of the eighth capacitor C8 and the other end of the fifth resistor R5 are all connected with the live wire N and grounded GND;
the fourth pin of the first chip U1 is sequentially connected with one end of the third capacitor C3, one end of the fifth capacitor C5 and the cathode of the third diode D3, the anode of the third diode D3 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is respectively connected with one end of the second inductor L2, the anode end of the seventh capacitor C7, one end of the fourth capacitor C4 and one end of the sixth capacitor C6 and is connected with the power supply VCC;
the other end of the third capacitor C3 is connected to the first pin of the first chip U1, the second pin of the first chip U1, the other end of the fifth capacitor C5, the cathode of the fourth diode D4, and the other end of the second inductor L2, respectively, and the anode of the fourth diode D4 is connected to the cathode end of the seventh capacitor, the other end of the fourth capacitor C4, and the other end of the sixth capacitor C6, and is grounded GND.
2. The bus power circuit of an electricity meter according to claim 1, wherein the thermistor RT1 has a device model number of any one of WMZY1-211C, WMZ91, WMZ92 and WMZ 93.
3. The circuit of claim 1, wherein the varistor VAR1 is selected from the group consisting of 20D510, 20D420 and 20D 680.
4. The BUCK power circuit of claim 1, wherein the first capacitor C1 and the eighth capacitor C8 are both high voltage capacitors and have the same device specifications.
5. The BUCK power circuit of the electricity meter according to claim 1, wherein the capacitance value of the third capacitor C3 is 4.7uF;
the capacitance value of the fifth capacitor C5 is 100nF;
the capacitance value of the seventh capacitor C7 is 470uF.
6. The BUCK power circuit of claim 1, wherein the first resistor R1, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 have the same resistance values of 300kΩ.
7. The BUCK power circuit of the electricity meter according to claim 1, wherein the second resistor R2 has a resistance value of 47 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322010451.0U CN220711336U (en) | 2023-07-28 | 2023-07-28 | BUCK power supply circuit of ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322010451.0U CN220711336U (en) | 2023-07-28 | 2023-07-28 | BUCK power supply circuit of ammeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220711336U true CN220711336U (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322010451.0U Active CN220711336U (en) | 2023-07-28 | 2023-07-28 | BUCK power supply circuit of ammeter |
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| Country | Link |
|---|---|
| CN (1) | CN220711336U (en) |
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2023
- 2023-07-28 CN CN202322010451.0U patent/CN220711336U/en active Active
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