CN219871536U - Electric energy meter circuit and electric energy meter thereof - Google Patents
Electric energy meter circuit and electric energy meter thereof Download PDFInfo
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- CN219871536U CN219871536U CN202321025384.3U CN202321025384U CN219871536U CN 219871536 U CN219871536 U CN 219871536U CN 202321025384 U CN202321025384 U CN 202321025384U CN 219871536 U CN219871536 U CN 219871536U
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- 239000003990 capacitor Substances 0.000 claims abstract description 62
- 238000004146 energy storage Methods 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000003381 stabilizer Substances 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 230000006399 behavior Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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Abstract
The utility model discloses an electric energy meter circuit and an electric energy meter thereof, which avoid misjudgment of power failure of the electric energy meter caused by the moment that the electric energy meter performs switching-on and switching-off under the condition of low voltage input. The electric energy meter circuit comprises a power failure detection circuit and a power supply circuit; the power failure detection circuit comprises a diode D3, a sampling circuit and an MCU; the power supply circuit comprises a transformer BT1, a rectifier bridge D2, an energy storage capacitor C18 and a three-terminal voltage stabilizer U5; the primary winding of BT1 receives alternating voltage; one secondary winding of BT1 is connected with the alternating current input end of D2 in parallel; the anode of D3 is connected with the output anode of D2, and the cathode of D3 is connected with one end of C18 and the input pin V of U5 in The method comprises the steps of carrying out a first treatment on the surface of the The output cathode of the D2, the other end of the C18 and the grounding pin of the U5 are grounded; u5 output pinV out Connecting with the power end of MCU; the sampling circuit is used for converting the output voltage of the D2 into voltage which can be identified by the MCU and sending the voltage to the MCU.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to an electric energy meter circuit and an electric energy meter thereof.
Background
The power supply circuit of the electric energy meter (for example, a single-phase fee-control intelligent electric energy meter) is shown in fig. 1, and converts the mains supply into the required direct current VCC through a transformer BT1, a rectifier bridge D2, an energy storage capacitor C18 and a three-terminal voltage stabilizer U5 to supply power for an MCU (Micro ControlUnit ) of the electric energy meter.
The switching-on/off function is one of common functions of the electric energy meter, and the MCU of the electric energy meter controls the switching-on/off of the relay through the relay driving circuit, so that the switching-on/off function is realized. Through opening and closing, the electric company can control the electricity consumption behavior of the electricity consumption customer, and illegal behaviors such as electricity larceny, electricity larceny and the like are prevented.
In addition, the electric energy meter also has a power failure detection function, and specifically comprises: the electric energy meter outputs voltage V to the rectifier bridge D2 through a sampling circuit 1 Voltage V which can be identified by MCU (micro control Unit) converted into electric energy meter 2 MCU of electric energy meter is detecting voltage V 2 And when the power is lower than the threshold value, judging that the electric energy meter is powered down, and performing corresponding processing (for example, restarting the electric energy meter).
However, under the condition of low voltage input (i.e. low mains voltage), the secondary side voltage of the transformer BT1 is instantaneously pulled down at the moment when the electric energy meter is opened and closed, resulting in voltage V 2 When the threshold value is lower than the threshold value, the MCU can misjudge that the electric energy meter is powered down, so that the electric energy meter is restarted, which is not expected. To avoid this, the prior art generally designs the capacitance of the energy storage capacitor C18 to be very large so as to suppress the instantaneous voltage V of the electric energy meter for switching on and off 2 But this in turn leads to an increase in the size and cost of the PCB (Printed Circuit Board ) of the power meter.
Disclosure of Invention
In view of this, the utility model provides an electric energy meter circuit and an electric energy meter thereof, so as to avoid misjudgment of power failure of the electric energy meter caused by the moment that the electric energy meter is switched on and off under the condition of low voltage input.
An electrical energy meter circuit comprising: a power down detection circuit and a power supply circuit;
the power failure detection circuit includes: diode D3, sampling circuit and MCU;
the power supply circuit includes: the transformer BT1, the rectifier bridge D2, the energy storage capacitor C18 and the three-terminal voltage stabilizer U5;
wherein, the primary winding of the transformer BT1 is used for receiving alternating voltage;
one secondary winding of the transformer BT1 is connected with the alternating current input end of the rectifier bridge D2 in parallel;
the anode of the diode D3 is connected with the output anode of the rectifier bridge D2, and the cathode of the diode D3 is connected with one end of the energy storage capacitor C18 and the input pin V of the three-terminal voltage regulator U5 in ；
The output cathode of the rectifier bridge D2, the other end of the energy storage capacitor C18 and the ground pin GND of the three-terminal voltage regulator U5 are all grounded;
the output pin V of the three-terminal voltage regulator U5 out The MCU is connected with a power end of the MCU;
the sampling circuit is used for converting the output voltage of the rectifier bridge D2 into voltage which can be identified by the MCU and sending the voltage to the MCU.
Optionally, the electric energy meter circuit further includes: a relay driving circuit which takes electricity from the cathode of the diode D3 as a power supply; and a signal input end of the relay driving circuit is connected with the MCU, and a signal output end of the relay driving circuit is connected with the relay.
Optionally, the sampling circuit includes a first resistor R17 and a second resistor R18;
one end of the first resistor R17 is connected with the output positive electrode of the rectifier bridge D2, one end of the second resistor R18 is grounded, and the other end of the first resistor R17 and the other end of the second resistor R18 are connected together and then connected into the MCU.
Optionally, the energy storage capacitor C18 is an electrolytic capacitor.
Optionally, the electric energy meter circuit further includes: the first filter capacitor C12, the first filter capacitor C12 is connected in parallel with the energy storage capacitor C18.
Optionally, the first filter capacitor C12 is a patch capacitor.
Optionally, the electric energy meter circuit further includes: a second filter capacitor C13; one end of the second filter capacitor C13 is connected with the output pin V of the three-terminal voltage regulator U5 out The other end is connected with the ground pin GND of the three-terminal voltage regulator U5.
Optionally, the second filter capacitor C13 is a patch capacitor.
An electric energy meter, comprising: such as any of the electrical energy meter circuits disclosed above.
Optionally, the electric energy meter is a single-phase fee-control intelligent electric energy meter.
As can be seen from the technical scheme, the output anode of the rectifier bridge D2 is connected with the diode D3 in series in the forward direction, and under the condition of low voltage input, the electric energy meter performs switching-on and switching-off instantly, and the cathode voltage V of the diode D3 3 Will be pulled down instantaneously according to the unidirectional conductivity of the diode D3, and the anode voltage V of the diode D3 1 Will not pull down in a short time, so from V 1 And after sampling and processing, the electric energy meter is fed into the MCU, so that the MCU can not misjudge the power failure of the electric energy meter at the moment of opening and closing the electric energy meter. At the moment, the energy storage capacitor C18 does not need to increase the capacitance to inhibit the instantaneous voltage V of the electric energy meter for opening and closing 1 Is a drop in (c).
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the 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 circuit structure of an electric energy meter disclosed in the prior art;
fig. 2 is a schematic diagram of a circuit structure of an electric energy meter according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of power supply of a relay driving circuit according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a sampling circuit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a circuit structure of another electric energy meter according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a circuit structure of another electric energy meter according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a circuit structure of another electric energy meter according to an embodiment of the present utility model;
FIG. 8 is a schematic diagram of a circuit configuration of another electric energy meter according to an embodiment of the present utility model;
fig. 9 is a schematic diagram of a circuit structure of another electric energy meter according to an embodiment 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. 2, an embodiment of the present utility model discloses an electric energy meter circuit, including: a power down detection circuit and a power supply circuit;
the power failure detection circuit includes: diode D3, sampling circuitry (not shown in fig. 2) and MCU (not shown in fig. 2);
the power supply circuit includes: the transformer BT1, the rectifier bridge D2, the energy storage capacitor C18 and the three-terminal voltage stabilizer U5;
the primary winding of the transformer BT1 is used for receiving alternating voltage, namely mains supply;
one secondary winding of the transformer BT1 is connected with the alternating current input end of the rectifier bridge D2 in parallel;
the anode of the diode D3 is connected with the output anode of the rectifier bridge D2, and the cathode of the diode D3 is connected with one end of the energy storage capacitor C18 and the input pin V of the three-terminal voltage regulator U5 in ；
The output cathode of the rectifier bridge D2, the other end of the energy storage capacitor C18 and the ground pin GND of the three-terminal voltage regulator U5 are all grounded;
output pin V of three-terminal voltage regulator U5 out The MCU is connected with a power end of the MCU;
the sampling circuit is used for outputting the voltage V to the rectifier bridge D2 1 Is converted into voltage V which can be identified by the MCU 2 And sending the power failure detection result to the MCU as a basis for the power failure detection of the MCU.
The scheme shown in fig. 2 is that a diode D3 is connected in series with the positive pole of the output of the rectifier bridge D2 in a forward direction, so that misjudgment of power failure of the electric energy meter caused by the moment that the electric energy meter performs switching-on and switching-off under the condition of low voltage input is avoided. The working principle of the scheme shown in fig. 2 is described in detail as follows:
when an ac voltage (mains supply) is input to the primary winding of the transformer BT1, a voltage and a current are generated in one secondary winding of the transformer BT1 and are input to the rectifier bridge D2, and a dc voltage is output by rectification.
The three-terminal voltage stabilizer U5 has only three leading-out terminals, and has the advantages of few external elements, convenient use, stable performance, low price and the like. The three-terminal voltage regulator U5 is an existing electronic circuit, which can stabilize the input voltage and the output voltage to keep a certain proportion (i.e., it can convert an unstable power supply into a stable power supply, thereby providing a stable power supply for the subsequent circuit), and its structural composition and working principle are the prior art, and are not described herein. The energy storage capacitor C18 in fig. 2 mainly plays a role of energy storage, and has a larger capacity, and generally adopts an electrolytic capacitor.
The high voltage of the output positive electrode of the rectifier bridge D2 is input to the input pin V of the three-terminal voltage stabilizer U5 through the diode D3 in Input pin V of three-terminal voltage regulator U5 at this time in A voltage difference is formed between the output pin V of the three-terminal voltage regulator U5 and the ground pin GND of the three-terminal voltage regulator U5 out And a voltage VCC is generated between the three-terminal voltage regulator U5 and the ground pin GND and is input to the MCU of the electric energy meter.
In FIG. 2, V is identified 1 Is the position of the voltage (i.e. the output voltage V of the rectifier bridge D2 1 ) Input to a sampling circuit which samples the voltage V 1 Is converted into voltage V which can be identified by the MCU 2 And input to MCU, the MCU detects voltage V 2 And when the power is lower than the threshold value, judging that the electric energy meter is powered down, and performing corresponding processing (for example, restarting the electric energy meter).
In the case of low voltage input, the moment when the electric energy meter performs opening and closing, because a larger current is required, and the input power is constant, as known from the formula p=ui, reference V in fig. 2 3 Voltage at the location (i.e. input pin V to three-terminal regulator U5 in Voltage V of (2) 3 ) Will be pulled down instantaneously, and according to the unidirectional conductive characteristic of diode D3, voltage V 1 Will not be pulled down in a short time, and still maintain the voltage value obtained by the mains supply through coupling of the transformer BT1 and rectification of the rectifier bridge D2 unchanged (corresponding to delaying the voltage V) 1 Reduced time), the MCU will not detect the voltage V in a short time 2 And the power is lower than the threshold value, so that the power failure of the electric energy meter can not be misjudged, and the electric energy meter can not be restarted. At this time, the required energy storage capacitor C18 only needs to maintain the voltage required by the opening and closing of the relay, and does not need to restrain the voltage V 1 And voltage V 2 So the energy storage capacitor C18 does not need to increase its capacitance.
If there is no diode D3, voltage V 1 Always with voltage V 3 Equipotential, voltage V at the moment of opening and closing of the electric energy meter 1 Can be pulled down instantaneously, and the capacity value of the energy storage capacitor C18 needs to be increased to inhibit the instantaneous voltage V of the electric energy meter when the electric energy meter is pulled off or closed 1 Is a drop in (c).
To sum up, in the embodiment of the utility model, a diode D3 is connected in series in the positive direction of the output positive electrode of the rectifier bridge D2, and when the electric energy meter performs switching on/off under the condition of low voltage input, the cathode voltage V of the diode D3 3 Will be pulled down instantaneously according to the unidirectional conductivity of the diode D3, and the anode voltage V of the diode D3 1 Will not pull down in a short time, so from V 1 And after sampling and processing, the electric energy meter is fed into the MCU, so that the MCU can not misjudge the power failure of the electric energy meter at the moment of opening and closing the electric energy meter. At this time, the energy storage capacitor C18 does not need to increase the capacitance to inhibit the electric energy meter from pullingSwitching-on instant voltage V 1 Is a drop in (c).
Alternatively, as shown in FIG. 3, for example, a relay driving circuit (the signal input end of the relay driving circuit is connected with the MCU, the signal output end of the relay driving circuit is connected with the relay, and the MCU controls the on-off of the relay through the relay driving circuit, thus realizing the switching-on and switching-off function) can be controlled from the voltage V 3 The power is taken as a self-power supply, but is not limited.
Optionally, based on any one of the embodiments disclosed above, as shown in fig. 4, the sampling circuit is a resistor voltage division sampling circuit, and includes a first resistor R17 and a second resistor R18, one end of the first resistor R17 is connected to the output positive pole of the rectifier bridge D2, one end of the second resistor R18 is grounded, and the other end of the first resistor R17 and the other end of the second resistor R18 are connected together and then connected to the MCU. The first resistor R17 and the second resistor R18 are voltage dividing resistors, the pair V 1 And dividing voltage and inputting the divided voltage to LVD pins of the MCU.
Optionally, as shown in fig. 5, based on any embodiment disclosed above, the electric energy meter circuit further includes: the first filter capacitor C12, the first filter capacitor C12 is connected in parallel with the energy storage capacitor C18. The filter capacitor C12 is used for filtering the output voltage of the rectifier bridge D2. The first filter capacitor C12 does not need a larger capacitance, and may be a patch capacitor (the patch capacitor is a capacitor material and is called a multi-layer chip ceramic capacitor), but is not limited thereto.
Optionally, as shown in fig. 6, according to any of the embodiments disclosed above, the electric energy meter circuit further includes a second filter capacitor C13; one end of the second filter capacitor C13 is connected with the output pin V of the three-terminal voltage regulator U5 out The other end is connected with the ground pin GND of the three-terminal voltage regulator U5; the second filter capacitor C13 plays a filtering role after the voltage of the three-terminal voltage regulator U5 is stabilized. The second filter capacitor C13 may be, but is not limited to, a patch capacitor.
In one example, as shown in FIG. 7, the voltage V is initially 1 About 16V, voltage V at initial time 3 About 15V, when the electric energy meter is switched on and off under the condition of low voltage input, 15V voltage is instantaneously pulled down, and 16V voltage is basic in a short timeThe cost remains unchanged.
It should be noted that, in any of the embodiments disclosed above, the storage capacitor C18 may be a single capacitor, or may be a combination of a plurality of capacitors, and is not limited to this, for example, fig. 8 illustrates that the storage capacitor C18 is two capacitors connected in series. Likewise, the second filter capacitor C13 may be a single capacitor or a combination of a plurality of capacitors, for example, fig. 9 illustrates that the second filter capacitor C13 is two capacitors connected in series. Likewise, the first filter capacitor C12 may be a single capacitor or a combination of a plurality of capacitors.
In addition, the embodiment also discloses an electric energy meter, which comprises any electric energy meter circuit disclosed in the above.
Optionally, the electric energy meter is a single-phase fee-controlled intelligent electric energy meter, but is not limited to the single-phase fee-controlled intelligent electric energy meter.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts of each embodiment are referred to each other, so that no further description is required.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An electrical energy meter circuit, comprising: a power down detection circuit and a power supply circuit;
the power failure detection circuit includes: a diode (D3), a sampling circuit and an MCU;
the power supply circuit includes: a transformer (BT 1), a rectifier bridge (D2), an energy storage capacitor (C18) and a three-terminal voltage stabilizer (U5);
wherein the primary winding of the transformer (BT 1) is configured to receive an ac voltage;
a secondary winding of the transformer (BT 1) is connected in parallel with the AC input end of the rectifier bridge (D2);
the anode of the diode (D3) is connected with the output anode of the rectifier bridge (D2), and the cathode of the diode (D3) is connected with one end of the energy storage capacitor (C18) and the input pin (V) of the three-terminal voltage stabilizer (U5) in )；
The output negative electrode of the rectifier bridge (D2), the other end of the energy storage capacitor (C18) and the grounding pin (GND) of the three-terminal voltage stabilizer (U5) are grounded;
an output pin (V) of the three-terminal voltage regulator (U5) out ) The MCU is connected with a power end of the MCU;
the sampling circuit is used for converting the output voltage of the rectifier bridge (D2) into a voltage which can be identified by the MCU and sending the voltage to the MCU.
2. The electrical energy meter circuit of claim 1, further comprising: a relay driving circuit that takes electricity from a cathode of the diode (D3) as a power supply; and a signal input end of the relay driving circuit is connected with the MCU, and a signal output end of the relay driving circuit is connected with the relay.
3. The electric energy meter circuit according to claim 1, wherein the sampling circuit comprises a first resistor (R17) and a second resistor (R18);
one end of the first resistor (R17) is connected with the output positive electrode of the rectifier bridge (D2), one end of the second resistor (R18) is grounded, and the other end of the first resistor (R17) and the other end of the second resistor (R18) are connected together and then connected into the MCU.
4. The electric energy meter circuit according to claim 1, characterized in that the energy storage capacitor (C18) is an electrolytic capacitor.
5. The electrical energy meter circuit of any one of claims 1-4, further comprising: and the first filter capacitor (C12) is connected with the energy storage capacitor (C18) in parallel.
6. The electric energy meter circuit according to claim 5, wherein the first filter capacitance (C12) is a patch capacitance.
7. The electrical energy meter circuit of any one of claims 1-4, further comprising: a second filter capacitor (C13); one end of the second filter capacitor (C13) is connected with an output pin (V) of the three-terminal voltage regulator (U5) out ) The other end is connected with a grounding pin (GND) of the three-terminal voltage stabilizer (U5).
8. The electric energy meter circuit according to claim 7, characterized in that the second filter capacitance (C13) is a patch capacitance.
9. An electric energy meter, comprising: the electrical energy meter circuit of any one of claims 1 to 8.
10. The electrical energy meter of claim 9, wherein the electrical energy meter is a single-phase fee-controlled intelligent electrical energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321025384.3U CN219871536U (en) | 2023-04-28 | 2023-04-28 | Electric energy meter circuit and electric energy meter thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321025384.3U CN219871536U (en) | 2023-04-28 | 2023-04-28 | Electric energy meter circuit and electric energy meter thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219871536U true CN219871536U (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321025384.3U Active CN219871536U (en) | 2023-04-28 | 2023-04-28 | Electric energy meter circuit and electric energy meter thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219871536U (en) |
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2023
- 2023-04-28 CN CN202321025384.3U patent/CN219871536U/en active Active
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Effective date of registration: 20240327 Address after: 325604 Delixi hi tech Industrial Park, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee after: DELIXI GROUP INSTRUMENT & INSTRUMENTATION CO.,LTD. Country or region after: China Address before: 325604 Delixi hi tech Industrial Park, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: DELIXI ELECTRIC Co.,Ltd. Country or region before: China |
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