CN217037063U - Power supply circuit of meter - Google Patents
Power supply circuit of meter Download PDFInfo
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- CN217037063U CN217037063U CN202220739881.9U CN202220739881U CN217037063U CN 217037063 U CN217037063 U CN 217037063U CN 202220739881 U CN202220739881 U CN 202220739881U CN 217037063 U CN217037063 U CN 217037063U
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Abstract
The application relates to the technical field of power supply, in particular to a power supply circuit of a meter, which comprises a power supply input module, a power supply output module and a power supply output module, wherein the power supply input module is connected with an external power supply and is used for receiving an external input power supply signal and outputting a power supply output signal; the first conversion module is connected with the power input module and used for receiving a first power signal output by the power input module and outputting a first conversion power signal; and the second conversion module is connected with the first conversion module and used for receiving the first conversion power supply signal output by the first conversion module and outputting a second conversion power supply signal. The voltage converter has the advantages that the first conversion module and the second conversion module output voltages with different voltage values, and different power consumption components work under the appropriate voltage values during working, so that the service life of the whole circuit is prolonged.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a power supply circuit of a meter.
Background
The metering device is a measuring device for metering energy, and has related application in metering electric quantity, water flow and the like so as to rapidly acquire consumption information of the energy.
In current counter, need carry out electric connection with the power usually to acquire external voltage and carry out the energy supply, make the counter can normal use, current counter is after converting external voltage to certain definite value voltage other power consumptive components and parts are supplied power, and the magnitude of voltage of output is single magnitude of voltage generally.
In view of the above related technologies, the inventor believes that the output voltage value between some internal power consumption components of the meter pair is single, which is not beneficial to the power consumption components in the meter circuit to obtain different required operating voltages, and is not beneficial to improving the service life of the components in the meter internal circuit, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
In order to provide required voltage values for power consumption components in the meter, so that the service life of related power consumption components can be prolonged, the power supply circuit of the meter is provided.
The utility model provides a counter power supply circuit adopts following technical scheme:
a power supply circuit of a meter comprises a power input module, a power output module and a power supply control module, wherein the power input module is connected with an external power supply and is used for receiving an external input power supply signal and outputting a power output signal;
the first conversion module is connected with the power input module and used for receiving a first power signal output by the power input module and outputting a first conversion power signal;
and the second conversion module is connected with the first conversion module and used for receiving the first conversion power supply signal output by the first conversion module and outputting a second conversion power supply signal.
By adopting the technical scheme, the power input module receives a power signal input by an external power supply and outputs a power output signal with a certain voltage value, the first conversion module receives the received power output signal and outputs a first conversion power signal which accords with the voltage values required by other power consumption components, the second conversion module receives the first conversion power signal sent by the first conversion module and outputs a second conversion power signal with another different voltage value, and therefore the corresponding voltage values can be output for power supply for different power consumption components, and the service lives of the power consumption components are prolonged.
Optionally, the power input module includes an input connection unit, a first filtering unit, and a first conversion unit;
the input connection unit is used for being connected with the outside to receive a power input signal input from the outside and transmit the power input signal to the first conversion unit;
the first filtering unit is connected between the input connecting unit and the first converting unit to filter the power input signal and transmit the filtered power input signal to the first converting unit;
the first conversion unit is used for receiving the filtered power input signal and converting the direct-current power input signal into a power output signal.
By adopting the technical scheme, the first filtering unit filters the power supply signal input from the outside to remove clutter in the input power supply signal, and simultaneously, the voltage amplitude of the power supply signal is kept stable, and the power consumption component is not easy to be impacted due to large change amplitude, so that the power consumption component is protected.
Optionally, the first filtering unit includes a first filtering subunit and a second filtering subunit;
the first filtering subunit is arranged between the input connection unit and the first conversion unit and is used for carrying out primary filtering on input electricity and outputting a primary filtering electric signal;
the second filtering subunit is arranged at the output end of the first conversion unit and used for receiving the sequential filtering electric signals output by the first conversion unit and outputting secondary filtering rear-end power output signals.
By adopting the technical scheme, the first filtering subunit filters an external input power signal, noise waves of the input power signal are reduced so that the first conversion unit converts an alternating current power supply into a direct current power supply, and the second filtering subunit is used for performing secondary filtering on the output direct current power supply so as to reduce the probability of noise waves influencing current stability in the output direct current power supply.
Optionally, a protection unit is connected between the input connection unit and the first filtering subunit, the protection unit is configured to receive a power input signal sent by the input connection unit, and when a voltage value corresponding to the power input signal is greater than a preset voltage value, the protection unit sends a protection signal, and a circuit where the protection unit is located is in an open circuit.
By adopting the technical scheme, the arrangement of the protection unit enables the connection unit not to generate short circuit due to larger voltage value of the input power signal, and plays an over-calable protection role on the circuit of the power input part.
Optionally, the first conversion module includes a first voltage stabilizing unit, a second filtering unit, and a second conversion unit;
the first voltage stabilizing unit is connected between the first conversion unit and the second conversion unit and used for receiving the power output signal output by the first conversion unit and outputting a voltage stabilizing signal;
the second conversion unit is used for receiving the voltage-stabilized power supply output signal and outputting a voltage-reduced first conversion power supply signal;
the second filtering unit is connected with the first voltage stabilizing unit and used for receiving and filtering the voltage-stabilized power supply signal so as to output the filtered power supply signal.
By adopting the technical scheme, the first voltage stabilizing unit further stabilizes the voltage of the received power output signal, so that the voltage value corresponding to the input power signal is kept stable, and the second filtering unit filters noise waves in the input power signal, so that the second converting unit outputs the stable first converted power signal.
Optionally, the power output end of the second conversion unit is further connected to an output filtering unit, and the output filtering unit is configured to receive the first converted power signal after voltage reduction and filter the first converted power signal to output the first converted power signal after filtering.
By adopting the technical scheme, the stability of the first conversion power supply signal output by the second conversion unit is further improved by the arrangement of the output filtering unit, so that the first conversion power supply signal received by the corresponding power consumption component is not easy to impact the related component.
Optionally, the second conversion module includes a third filtering unit and a third conversion unit;
the third conversion unit is connected with the second conversion unit and used for receiving the first conversion power supply signal output by the second conversion unit and outputting a second conversion power supply signal;
the third filtering unit is connected between the second converting unit and the third converting unit, and is configured to receive the first converted power supply signal output by the second converting unit, and filter the first converted power supply signal to output the filtered first converted power supply signal.
By adopting the above technical scheme, the third filtering unit filters the first converted power supply signal input to the third converting unit, so that the third converting unit can receive a stable input power supply, thereby outputting a stable second converted power supply signal.
Optionally, the second conversion module further includes a second voltage stabilization unit, where the second voltage stabilization unit is connected between the third filtering unit and the third conversion unit, and is configured to receive and stabilize the first conversion power supply signal output by the third filtering unit, so as to transmit the stabilized first conversion power supply signal to the third conversion unit.
By adopting the technical scheme, the first conversion power supply signal input to the second conversion unit has a stable voltage value due to the arrangement of the second voltage stabilizing unit, so that the third conversion unit is not easy to be damaged due to large voltage value fluctuation.
Optionally, the second conversion module further includes a fourth filtering unit, where the fourth filtering unit is connected to the second conversion unit, and is configured to receive the second conversion power signal output by the third conversion unit and send a filtered signal.
By adopting the technical scheme, the fourth filtering unit filters the second conversion power supply signal sent by the third conversion unit, so that the second conversion power supply signal is not easy to generate interference signals when being transmitted to other power consumption components.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the power input module receives a power signal input by an external power supply and outputs a power output signal with a certain voltage value, the first conversion module receives the received power output signal and outputs a first conversion power signal which accords with voltage values required by other power consumption components, and the second conversion module receives the first conversion power signal sent by the first conversion module and outputs a second conversion power signal with another different voltage value, so that the different power consumption components can output corresponding voltage values to supply power, and the service lives of the power consumption components are prolonged;
2. the first filtering unit filters an externally input power supply signal to remove clutter in the input power supply signal, and simultaneously keeps the voltage amplitude of the power supply signal stable, so that power consumption components are not easy to be impacted due to large change amplitude, and the power consumption components are protected;
3. the fourth filtering unit filters the second conversion power supply signal sent by the third conversion unit, so that the second conversion power supply signal is not easy to generate interference signals when being transmitted to other power consumption components.
Drawings
FIG. 1 is a block flow diagram of a meter power supply circuit of the present application.
Fig. 2 is a circuit diagram of a power input module in the present application.
Fig. 3 is a circuit diagram of a first conversion module in the present application.
Fig. 4 is a circuit diagram of a second conversion module in the present application.
Description of the reference numerals: 1. a power input module; 10. an input connection unit; 11. a first filtering unit; 110. a first filtering subunit; 111. a second filtering subunit; 12. a first conversion unit; 13. a protection unit; 2. a first conversion module; 20. a first voltage stabilization unit; 21. a second filtering unit; 22. a second conversion unit; 23. an output filtering unit; 3. a second conversion module; 30. a third filtering unit; 31. a third conversion unit; 32. a second voltage stabilization unit; 33. and a fourth filtering unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a meter power supply circuit. Referring to fig. 1, the power supply circuit of the meter includes a power input module 1, a first conversion module 2 and a second conversion module 3, the power input module 1 is connected to an external power source through a power plug wire to receive 220V alternating current and transmit a power output signal with a corresponding voltage value, the first conversion module 2 receives the power output signal output by the power input module 1 and performs first conversion to output a voltage value meeting the requirements of some power consuming components in the meter circuit, and the second conversion module 3 performs second conversion on a part of the first conversion power signal output by the first conversion module 2 to convert a second conversion power signal with a voltage value meeting the voltage values of other power consuming components.
In this embodiment, the voltage value corresponding to the power output signal output by the power input module 1 is 24V, the voltage value corresponding to the first converted power signal output by the first conversion module 2 is 12V, the voltage value corresponding to the second converted power signal output by the second conversion module 3 is 5V, and the voltage values of 24V, 12V and 5V are all voltage values commonly used in a circuit, and may be voltages of other values in other embodiments.
Referring to fig. 2, the power input module 1 includes an input connection unit 10, a first filtering unit 11 and a first converting unit 12, the input connection unit 10 is a power interface, and is plugged into an external power source through a power plug and a socket to obtain an externally input 220V ac power source, the first filtering unit 11 is connected between the input connection unit 10 and the first converting unit 12 to receive an input power signal input by the input connection unit 10 and output a power output signal to the first converting unit 12, and the first converting unit 12 converts the power input signal into a power output signal with a voltage value of 24V.
In this embodiment, the first conversion unit 12 is an ac-to-dc chip, the chip model is acdcd 10, and the chip acdcd 10 has 6 pins, where the pins 1 and 2 are ac power input terminals, the pins 3, 4, 5, and 6 are power output terminals, and the pins 5 and 6 are dc power output terminals.
The input connection unit 10 includes: the power supply circuit comprises a first capacitor C1 and a common mode inductor T1, wherein a positive electrode input end of the input connection unit 10 is connected with a positive electrode of an external power line, a positive electrode output end of the input connection unit 10 is connected with a first capacitor C1, the other end of the first capacitor C1 is connected with one end of a common mode inductor T1, and the other end of the common mode inductor T1 is connected with a pin 2 of the first connection unit. The negative input end of the input connection unit 10 is connected to the negative of the external power line, the negative output end of the input connection unit 10 is connected to one end of the mode inductor T1, and the other end of the mode inductor T1 is connected to pin 1 of the input connection unit 10.
Referring to fig. 2, the first filtering unit 11 includes a first filtering subunit 110 and a second filtering subunit 111, and the first filtering subunit 110 is connected between the first converting unit 12 and the input connecting unit 10 to receive an external input power signal and filter the external input power signal, so that the filtered power input signal is transmitted to the first converting unit 12. The second filtering subunit 111 is connected to the power output terminal of the first converting unit 12 to filter the output dc power output signal.
The first filtering subunit 110 includes: a first inductor L1 and a second capacitor C2, one end of the first inductor L1 is connected to pin 2 of the first conversion unit 12, the other end of the first inductor L1 is connected to the other end of the common mode inductor T1, and the second capacitor C2 is connected in parallel between pin 1 and pin 2 of the first conversion unit 12.
The third capacitor C3 is connected to the pin 3 of the first switching unit 12, and the other end of the third capacitor C3 is connected to the pin 4 of the first switching unit 12.
The second filtering subunit 111 includes: a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6. The fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 are all connected in parallel between the pin 5 and the pin 6 of the first conversion unit 12, and the second inductor L2 is connected between one ends of the fourth capacitor C4 and the fifth capacitor C5 connected to the pin 6 of the first conversion unit 12. One end of the sixth capacitor C6 outputs a 24V dc power VCC.
Referring to fig. 2, in order to protect the first conversion unit 12 from the breakdown of the first conversion unit 12 due to the over-voltage, a protection unit 13 is connected between the input connection unit 10 and the first filtering subunit 110.
The protection unit 13 includes: a first resistor R1 and a piezoresistor RV2, wherein two ends of the piezoresistor RV2 are respectively connected in parallel between the pin 1 and the pin 2 of the first conversion unit 12, one end of the first resistor R1 is connected with one end of the piezoresistor RV2, and the other end of the first resistor R1 is connected with the pin 2 of the first conversion unit 12.
Referring to fig. 3, the first conversion module 2 includes a first voltage stabilization unit 20, a second filtering unit 21, and a second conversion unit 22, the first voltage stabilization unit 20 is connected between the first conversion unit 12 and the second conversion unit 22 to receive the first converted power signal output by the first conversion unit 12 and perform voltage stabilization, so as to transmit the stabilized first converted power signal to the second conversion unit 22, and the second conversion unit 22 receives the first converted power signal and converts the first converted power signal into a second converted power signal with a voltage value of 12V.
Referring to fig. 3, the first voltage regulation unit 20 is a zener diode D1, an anode of the zener diode D1 is grounded, a cathode of the zener diode D1 is connected to one end of an eighth capacitor C8, and the other end of the eighth capacitor C8 is connected to a 24V dc power VCC.
Referring to fig., the second filtering unit 21 includes: a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twentieth capacitor C12, a thirteenth capacitor C13, and a fourteenth capacitor C14. One end of the ninth capacitor C9 is connected to the other end of the zener diode D1, the other end of the ninth capacitor C9 is connected to one ends of the thirteenth capacitor C13 and the fourteenth capacitor C14, and the other ends of the thirteenth capacitor C13 and the fourteenth capacitor C14 are grounded. One end of the tenth capacitor C10 is connected to the other end of the zener diode D1, the other end of the tenth capacitor C10 is connected to one ends of the eleventh capacitor C11 and the twentieth capacitor C12, and the other ends of the eleventh capacitor C11 and the twentieth capacitor C12 are grounded.
Referring to fig. 3, the second conversion unit 22 is a voltage conversion chip U1, the model of the chip U1 is UMW78L12, the second conversion unit 22 has a power input terminal In, a power output terminal Out and a ground terminal GND, the power input terminal In is connected to one end of an eleventh capacitor C11 and one end of a twentieth capacitor C12, and the power output terminal Out outputs a first conversion power signal with a voltage value of 12V.
Referring to fig. 3, in order that the output first converted power supply signal has a stable output value, the power supply output terminal Out of the second conversion unit 22 is further connected with an output filter unit 23, the output filter unit 23 includes a fifteenth capacitor C15 and a second sixth capacitor C16, one ends of the fifteenth capacitor C15 and the second sixth capacitor C16 are both connected with the power supply output terminal Out, and the other ends of the fifteenth capacitor C15 and the second sixth capacitor C16 are both connected with ground, so as to stabilize the first converted power supply signal output from the power supply output terminal Out.
Referring to fig. 4, the second conversion module 3 includes: the third filtering unit 30 is connected to the third converting unit 31, the third converting unit 31 is connected to the second converting unit 22 to receive the first converted power signal sent by the second converting unit 22 and output a second converted power signal, a voltage value corresponding to the second converted power signal is 24V, and the third filtering unit 30 is connected to the third converting unit 31 to filter the output second converted power signal.
Referring to fig. 4, the third converting unit 31 is a voltage converting core U2, the model of the chip U2 is LMS2576S-5.0, the third converting unit 31 has 6 pins, where pin 1 is a power input terminal, pin 1 is connected to the power output terminal of the second converting unit 22, pin 2 is a power output terminal, pin 2 is connected to the third filtering unit 30, in this embodiment, the third filtering unit 30 is a third inductor L3, one end of the third inductor L3 is connected to pin 2 of U2, and the other end of the third inductor L3 is a power output terminal.
Referring to fig. 4, in order to increase the stability of the power output from the power output terminal of the U2, a second voltage stabilizing unit 32 is further connected to pin 2 of the U2, the second voltage stabilizing unit 32 is a second voltage stabilizing diode D2, one end of the second voltage stabilizing diode D2 is connected to pin 2 of the U2, and the other end of the second voltage stabilizing diode D2 is grounded. The pin 3 of the U2 is a ground terminal, the pin 4 is a feedback terminal, the pin 4 is connected to the fourth filter unit 33, the fourth filter unit 33 is a seventeenth capacitor C17, one end of the seventeenth capacitor C17 is grounded, and the other end of the seventeenth capacitor C17 is connected to the power input terminal of other power consuming components. Pins 5, 6 of U2 are both grounded.
The implementation principle of a counter power supply circuit of the embodiment of the application is as follows: the power supply is connected with an external power supply through the connection input unit to obtain an external alternating current power supply, the alternating current power supply is converted into a direct current power supply through the first conversion unit 12, the second conversion unit 22 performs voltage reduction output on the input power supply to output a 12V first conversion power supply signal, and a 5V second conversion power supply signal is converted and output through the third conversion unit 31 to obtain two output power supplies with different voltage values to supply power to different power consumption components.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A meter power supply circuit, characterized by: comprises that
The power supply input module (1), the said power supply input module (1) is connected with external power supply, used for receiving the external input power supply signal and outputting the power supply output signal;
the first conversion module (2) is connected with the power input module (1), and is used for receiving a first power signal output by the power input module (1) and outputting a first conversion power signal;
the second conversion module (3) is connected with the first conversion module (2), and is configured to receive the first conversion power signal output by the first conversion module (2) and output a second conversion power signal.
2. The meter power supply circuit of claim 1, wherein: the power input module (1) comprises an input connection unit (10), a first filtering unit (11) and a first conversion unit (12);
the input connection unit (10) is used for being connected with the outside to receive a power input signal input from the outside and transmit the power input signal to the first conversion unit (12);
the first filtering unit (11) is connected between the input connection unit (10) and the first conversion unit (12) to filter the power input signal and transmit the filtered power input signal to the first conversion unit (12);
the first conversion unit (12) is configured to receive the filtered power input signal and convert the dc power input signal into a power output signal.
3. The meter power supply circuit of claim 2, wherein: the first filtering unit (11) comprises a first filtering subunit (110) and a second filtering subunit (111);
the first filtering subunit (110) is arranged between the input connection unit (10) and the first conversion unit (12) and is used for carrying out primary filtering on input electricity and outputting a primary filtered electric signal;
the second filtering subunit (111) is arranged at the output end of the first conversion unit (12) and is used for receiving the sequentially filtered electric signals output by the first conversion unit (12) and outputting secondary filtered rear-end power output signals.
4. The meter power supply circuit of claim 3, wherein: a protection unit (13) is connected between the input connection unit (10) and the first filtering subunit (110), the protection unit (13) is configured to receive a power input signal sent by the input connection unit (10), when a voltage value corresponding to the power input signal is greater than a preset voltage value, the protection unit (13) sends a protection signal, and a circuit where the protection unit (13) is located is disconnected.
5. The meter power supply circuit of claim 2, wherein: the first conversion module (2) comprises a first voltage stabilizing unit (20), a second filtering unit (21) and a second conversion unit (22);
the first voltage stabilizing unit (20) is connected between the first conversion unit (12) and the second conversion unit (22) and is used for receiving the power output signal output by the first conversion unit (12) and outputting a voltage stabilizing signal;
the second conversion unit (22) is used for receiving the voltage-stabilized power supply output signal and outputting a voltage-reduced first conversion power supply signal;
the second filtering unit (21) is connected to the first voltage stabilizing unit (20) and configured to receive the voltage-stabilized power signal and perform filtering to output a filtered power signal.
6. The meter power supply circuit of claim 5, wherein: the power output end of the second conversion unit (22) is further connected with an output filtering unit (23), and the output filtering unit (23) is configured to receive the stepped-down first conversion power signal and filter the signal to output a filtered first conversion power signal.
7. The meter power supply circuit of claim 6, wherein: the second conversion module (3) comprises a third filtering unit (30) and a third conversion unit (31);
the third conversion unit (31) is connected to the second conversion unit (22) and configured to receive the first conversion power signal output by the second conversion unit (22) and output a second conversion power signal;
the third filtering unit (30) is connected between the second converting unit (22) and the third converting unit (31), and is configured to receive the first converted power supply signal output by the second converting unit (22), and filter the first converted power supply signal to output a filtered first converted power supply signal.
8. The meter power supply circuit of claim 7, wherein: the second conversion module (3) further comprises a second voltage stabilization unit (32), and the second voltage stabilization unit (32) is connected between the third filtering unit (30) and the third conversion unit (31) and is configured to receive the first conversion power supply signal output by the third filtering unit (30) and stabilize the voltage of the first conversion power supply signal, so as to transmit the stabilized first conversion power supply signal to the third conversion unit (31).
9. The meter power supply circuit of claim 7, wherein: the second conversion module (3) further comprises a fourth filtering unit (33), and the fourth filtering unit (33) is connected to the second conversion unit (22) and configured to receive the second conversion power signal output by the third conversion unit (31) and send a filtered signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220739881.9U CN217037063U (en) | 2022-03-31 | 2022-03-31 | Power supply circuit of meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220739881.9U CN217037063U (en) | 2022-03-31 | 2022-03-31 | Power supply circuit of meter |
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| Publication Number | Publication Date |
|---|---|
| CN217037063U true CN217037063U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220739881.9U Active CN217037063U (en) | 2022-03-31 | 2022-03-31 | Power supply circuit of meter |
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