CN220105273U - Power-on detection circuit of electric energy meter - Google Patents
Power-on detection circuit of electric energy meter Download PDFInfo
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- CN220105273U CN220105273U CN202223443224.9U CN202223443224U CN220105273U CN 220105273 U CN220105273 U CN 220105273U CN 202223443224 U CN202223443224 U CN 202223443224U CN 220105273 U CN220105273 U CN 220105273U
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Abstract
The power-on detection circuit of the electric energy meter comprises a power supply module, a threshold detection module, a starting pulse module, a voltage detection module and a control module; the power supply signal end of the threshold detection module is connected with a first power supply of the power supply module, and the output end of the threshold detection module is respectively connected with the starting pulse module and the voltage detection module; the threshold detection module detects the voltage of the first power supply VIN, and when the first power supply VIN is larger than a threshold Vz, the voltage output by the threshold detection module is changed in a step mode; according to the voltage step change, a starting pulse module outputs a single positive voltage pulse to a control module, and a voltage detection module outputs a logic level; the control module receives a single positive voltage pulse to trigger the interrupt dormancy awakening, reads the logic level state output by the voltage detection module, and performs power-on detection on the electric energy meter based on the logic level state, so that the reliable operation of the electric energy meter in a complex working environment is ensured.
Description
Technical Field
The utility model relates to the technical field of electric energy meters, in particular to an electric energy meter power-on detection circuit.
Background
The electric energy meter is used as a legal metering device for electric charge settlement, and the electric energy meter can be operated for a long time and high reliability under various complex working environments, so that the electric energy meter has become one of main requirements of technicians in the industry. The current situation of increasingly complex power grid environment and power load brings higher requirements to the design of power-on detection of the electric energy meter.
At present, two modes are generally adopted for power-on detection of the electric energy meter,
mode one: the detection circuit detects the power-on state of the main power supply of the electric energy meter, and the MCU is used for waking up and confirming the power-on state signal of the main power supply at fixed time. The defect of the method is that the power-on starting time of the electric energy meter is determined by the sleep timing wake-up interval time of the MCU, and the work life factor of the battery is considered, so that the wake-up interval time cannot be too small and is more than the second level;
mode two: the main power supply voltage of the electric energy meter is sampled in a resistor voltage division mode, and an interrupt signal is generated by utilizing the function of an MCU internal voltage comparator. The mode requires the MCU to support the function of the voltage comparator in the dormant state, and the voltage comparator functional module is started in the dormant state, so that the dormant power consumption of the MCU is increased, and the service life of the battery is shortened.
Disclosure of Invention
The utility model aims to solve the problems of the current power-on detection mode of the electric energy meter, and provides a power-on detection circuit of the electric energy meter, which ensures the reliable operation of the electric energy meter in a complex working environment.
The technical scheme of the utility model is as follows:
the utility model provides a power-on detection circuit of an electric energy meter, which comprises a power supply module, a threshold detection module, a starting pulse module, a voltage detection module and a control module, wherein the power supply module is connected with the starting pulse module; the power supply signal end of the threshold detection module is connected with a first power supply of the power supply module, and the output end of the threshold detection module is respectively connected with the starting pulse module and the voltage detection module; the logic level output of the voltage detection module is connected with the corresponding input end of the control module;
the threshold detection module detects the voltage of the first power supply VIN, and when the first power supply VIN is larger than a threshold Vz, the voltage output by the threshold detection module is changed in a step mode;
according to the voltage step change, a starting pulse module outputs a single positive voltage pulse to a control module, and a voltage detection module outputs a logic level;
the control module receives a single positive voltage pulse to trigger the interrupt dormancy awakening, reads the logic level state output by the voltage detection module, and performs power-on detection on the electric energy meter based on the logic level state.
Further, the threshold detection module comprises a first zener diode D1, a first resistor R1 and a second resistor R2, wherein the cathode of the first zener diode D1 is connected with a first power supply, the anode of the first zener diode D1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the second resistor R2 in series and then grounded, and the connection point of the first resistor R1 and the second resistor R2 is used as the output of the threshold detection module.
Further, the start pulse module comprises a first switch unit and a second switch unit, the input end of the first switch unit is connected with the output end of the threshold detection module, the output end of the first switch unit is connected with the input end of the second switch unit, and the output end of the second switch unit is connected with the corresponding input end of the control module.
Further, the first switch unit includes a first capacitor C1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and an NPN triode Q1, one end of the first capacitor C1 is connected to the output end of the threshold detection module, the other end of the first capacitor C1 is connected to the third resistor R3 in series and then grounded, the connection point of the first capacitor C1 and the third resistor R3 is connected to the base of Q1 in series and then connected to the fourth resistor R4, the emitter of Q1 is grounded, and the collector is connected to the second power supply of the power supply module in series and then connected to the fifth resistor R5;
the second switch unit comprises a sixth resistor R6, a PNP triode Q2 and a seventh resistor R7, wherein the connection point of the collector of the Q1 and the fifth resistor R5 is used as the output of the first switch unit to be connected with the base electrode of the Q2, the emitter electrode of the Q2 is connected with a second power supply, the collector electrode of the Q2 is connected with the seventh resistor R7 in series and then grounded, and the connection point of the collector of the Q2 and the seventh resistor R7 is the output of the second switch unit and is used as the output of the start pulse module to be connected with the corresponding input end of the control module.
Further, the voltage detection module comprises an eighth resistor R8, an NPN triode Q3 and a ninth resistor R9, one end of the eighth resistor R8 is connected with the output of the threshold detection module, the other end of the eighth resistor R8 is connected with the base electrode of the Q3, the emitter electrode of the Q3 is grounded, the emitter electrode of the Q3 is connected with the ninth resistor R9 in series and then is connected with a second power supply of the power supply module, and a connection point of the emitter electrodes of the ninth resistor R9 and the Q3 is used as the output of the voltage detection module.
Further, the power supply module comprises a first power supply and a second power supply, wherein the first power supply is a direct current power supply output by the AC/DC power supply module of the electric energy meter; the second power supply is a direct current power supply provided by the direct current power supply which is subjected to voltage reduction and voltage stabilization of the first power supply and the battery power supply.
The utility model has the beneficial effects that:
according to the electric energy meter power-on detection circuit, the main power supply is started to design the threshold voltage, the starting pulse signal triggers wakeup sleep interrupt to wake up, and the electric energy meter power-on condition is judged according to the double detection signals, so that the electric energy meter power-on detection circuit has the characteristics of no need of increasing the power consumption of a battery in a sleep state, no limitation of an MCU main control chip and the like, and realizes millisecond-level electric energy meter power-on starting, and is high in reliability, concise in circuit and low in cost.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.
Fig. 1 shows a circuit diagram of the present utility model.
Fig. 2 shows a power-on detection flowchart of the electric energy meter in the embodiment of the utility model.
Detailed Description
Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein.
As shown in fig. 1, the utility model provides a power-on detection circuit of an electric energy meter, which comprises a power supply module 1, a threshold detection module 2, a starting pulse module 3, a voltage detection module 4 and a control module 5; the power supply signal end of the threshold detection module 2 is connected with a first power supply 11 of the power supply module 1, and the output end of the threshold detection module 2 is respectively connected with the starting pulse module 3 and the voltage detection module 4; the logic level output of the voltage detection module 4 is connected with the corresponding input end of the control module 5;
the threshold detection module 2 detects the voltage of the first power supply 11VIN, and when the first power supply 11VIN is greater than a threshold Vz, the voltage output by the threshold detection module 2 is changed in a step manner;
according to the voltage step change, the start pulse module 3 outputs a single positive voltage pulse to the control module 5, and the voltage detection module 4 outputs a logic level;
the control module 5 receives a single positive voltage pulse to trigger the interrupt dormancy wakeup, reads the logic level state output by the voltage detection module 4, and performs power-on detection of the electric energy meter based on the logic level state.
The above circuit performs the following detection steps, including:
the threshold detection module 2 detects the voltage of the first power supply 11VIN, and when the first power supply 11VIN is larger than the threshold Vz, the voltage output by the threshold detection module 2 is changed in a step mode;
when the voltage step change occurs, the starting pulse module 3 outputs a single positive voltage pulse to the control module 5, and the voltage detection module 2 outputs a logic level;
the control module 5 receives a single positive voltage pulse to trigger the interrupt dormancy wakeup, reads the logic level state output by the voltage detection module 4, and performs power-on detection of the electric energy meter based on the logic level state, specifically:
if the logic level is 0, judging that the commercial power is electrified, and carrying out soft reset operation on main programs by the control module 5;
otherwise, the sleep is continued, and the sleep wake-up signal is waited for being interrupted next time.
As shown in fig. 1, the power module 1 of the present embodiment includes a first power source 11 (VIN) and a second power source 12 (VDD). The first power supply 11 is a direct current power supply of the secondary output of the AC/DC switching power supply module of the electric energy meter; the second power supply 12 is provided by two paths of power supplies together, one path is a direct current power supply after the voltage reduction and voltage stabilization of the first power supply 11, and the other path is a battery power supply module output power supply; the voltage of the first power supply 11 in this embodiment is 10V; the second power supply 12 voltage is 3.3V.
As shown in fig. 1, the threshold detection module 2 of the present embodiment includes a first power supply 11 (VIN), a zener diode D1, a resistor R1, and a resistor R2. The cathode of the zener diode D1 is connected with the first power supply 11, the resistor R1 is connected with the anode of the zener diode D1, and the resistor R2 is connected between the resistor R1 and the ground.
As shown in fig. 1, the start pulse module 3 in this embodiment includes a first switch unit 31 and a second switch unit 32, where the first switch unit 31 is connected to the threshold detection module 2, and the threshold detection module 2 controls the on/off of the first switch unit 31. The second switch unit 32 is connected to the first switch unit 31, and is turned on and off by the first switch unit 31.
Further, the first switching unit 31 includes a second power supply 12 (VDD), a capacitor C1, a resistor R3, a resistor R4, a resistor R5, and an NPN transistor Q1. The capacitor C1 is connected with the threshold detection module 2, the resistor R3 is connected between the capacitor C1 and the ground, the resistor R4 is connected between the capacitor C1 and the base electrode of the NPN triode Q1, the emitter electrode of the NPN triode Q1 is grounded, and the resistor R5 is connected between the collector electrode of the NPN triode Q1 and the second power supply 12 (VDD).
Further, the second switching unit 32 includes a second power supply 12 (VDD), a resistor R6, a PNP transistor Q2, and a resistor R7. The resistor R6 is connected between the first switch unit and the base electrode of the PNP type triode Q2, the emitter electrode of the PNP type triode Q2 is connected with the second power supply 12 (VDD), and the resistor R7 is connected between the collector electrode of the PNP type triode Q2 and the ground.
As shown in fig. 1, the voltage detection module 4 of the present embodiment includes a second power supply 12 (VDD), a resistor R8, an NPN transistor Q3, and a resistor R9. The resistor R8 is connected between the threshold detection module 2 and the base of the NPN transistor Q3, the emitter of the NPN transistor Q3 is grounded, and the resistor R9 is connected between the second power supply 12 (VDD) and the emitter of the NPN transistor Q3.
As shown in fig. 1, the control module in this embodiment includes a second power supply 12 (VDD), an MCU host chip, and the like. The MCU main control chip is connected with a second power supply 12 (VDD), and the starting pulse module 3 and the voltage detection module 4 are connected with the MCU main control chip. The MCU main control chip is connected with the start pulse module 3, and the I/O port supports the sleep interrupt awakening function.
Specifically, the working process of the power-on detection circuit in this embodiment is as follows:
the electric energy meter is electrified, the first power supply 11 (VIN) is rapidly increased to 10V from 0V, when VIN is larger than the regulated voltage Vz of the regulated diode D1 in the VIN increasing process, the regulated diode D1 acts, the voltage at two ends of the regulated diode D1 is a fixed value Vz, and then the voltage at two ends of the resistor R2 is (VIN-Vz) multiplied by R2/(R1+R2).
When VIN is larger than Vz, the voltage at two ends of the resistor R2 is changed in a step mode, and the threshold voltage Vz design can avoid the problem that the power-on detection is triggered by mistake due to VIN abnormal voltage fluctuation of the electric energy meter under a complex working environment, such as strong magnet power stealing.
Further, when the voltage across the resistor R2 is stepped from 0V to (VIN-Vz) ×r2/(r1+r2), the voltage charges the RC circuit formed by the capacitor C1, the resistor R3, the resistor R4, and the emitter of the NPN transistor Q1.
When the charging time t=0, the voltage at two ends of the equivalent resistor R of the RC circuit is (VIN-Vz), the emitter of the NPN triode Q1 is forward biased, the collector is reverse biased, the NPN triode Q1 is saturated and turned on, and the collector of the NPN triode Q1 outputs a low level. Along with the gradual increase of the charging time t, the voltage at two ends of the equivalent resistor R gradually decreases, and when the voltage does not meet the forward bias of the emitter of the NPN triode Q1, the NPN triode Q1 is cut off, and the collector of the NPN triode Q1 outputs a high level. Further, the collector of NPN transistor Q1 outputs a low level pulse signal.
In the process of turning on and off the NPN type triode Q1, the base current of the NPN type triode Q1 decreases gradually, and the voltages at the two ends of the collector and the emitter of the NPN type triode Q1 increase gradually, which is reflected in that the low-level pulse signal of the collector of the NPN type triode Q1 shows a slowly rising state from low level to high level.
It should be noted that, the RC time constant of the RC circuit is adjusted to obtain pulse signals with different pulse widths, and the pulse width can be adjusted in a range from tens of milliseconds to hundreds of milliseconds.
Further, when the collector output of the NPN triode Q1 is low, the PNP triode Q2 is conducted, and the collector of the PNP triode Q2 is high; when the collector electrode of the NPN triode Q1 outputs a high level, the PNP triode Q2 is cut off, and the collector electrode of the PNP triode Q2 is low level; furthermore, the collector of the PNP transistor Q2 outputs a high-level pulse signal synchronized with the collector signal of the NPN transistor Q1.
It should be noted that the PNP transistor Q2 switching unit optimizes the problem of slow rise from the low level to the high level of the low level pulse signal of the NPN transistor Q1 switching unit.
Further, when the voltage across the resistor R2 is changed from 0V to (VIN-Vz) ×r2/(r1+r2), the NPN transistor Q3 is turned on, and the collector of the NPN transistor Q3 is at a low level; when the voltage at the two ends of the resistor R2 is 0V, the NPN triode Q3 is cut off, and the collector electrode of the NPN triode Q3 is high level.
Further, the MCU master control unit circuit in this embodiment includes a power supply VDD, an MCU master control chip, and the like. The MCU main control chip realizes the power-on starting of the electric energy meter through the related control flow of the figure 2.
It should be noted that, in the state that the electric energy meter is not powered on, the zener diode D1 is turned off, the NPN type triode Q1 is turned off, the PNP type triode Q2 is turned off, the NPN type triode Q3 is turned off, and the power consumption of the second power supply 12 is not consumed by the power-on detection circuit, that is, the power consumption of the battery is not increased.
As shown in fig. 2, the power-on detection process in this embodiment is as follows:
and after the mains supply of the electric energy meter is powered off and related power failure processing operation is carried out, the MCU enters a dormant state.
After mains supply of the electric energy meter comes, the starting pulse module 3 of the embodiment outputs a single positive voltage pulse signal (wakeup signal), the MCU is in sleep interruption and awaken, the awakening source is judged, if the electric energy meter is in mains supply, the logic level state output by the voltage detection module 4 of the embodiment is continuously read for multiple times, if the electric energy meter is in the power on state, the MCU is in soft reset to run main program, otherwise, the sleep state judgment is carried out, if the condition is met, the MCU enters sleep again, and the next wakeup interrupt signal is waited.
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (7)
1. The utility model provides a power-on detection circuit of electric energy meter which characterized in that: the circuit comprises a power supply module (1), a threshold detection module (2), a starting pulse module (3), a voltage detection module (4) and a control module (5); the power supply signal end of the threshold detection module (2) is connected with a first power supply (11) of the power supply module (1), and the output end of the threshold detection module (2) is respectively connected with the starting pulse module (3) and the voltage detection module (4); the logic level output of the voltage detection module (4) is connected with the corresponding input end of the control module (5).
2. The power-on detection circuit of an electric energy meter according to claim 1, wherein the threshold detection module (2) comprises a first zener diode D1, a first resistor R1 and a second resistor R2, a cathode of the first zener diode D1 is connected with the first power supply (11), an anode of the first zener diode D1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the second resistor R2 in series and then grounded, and a connection point of the first resistor R1 and the second resistor R2 is used as an output of the threshold detection module (2).
3. The power-on detection circuit of an electric energy meter according to claim 1, wherein the start pulse module (3) comprises a first switch unit (31) and a second switch unit (32), the input end of the first switch unit (31) is connected with the output end of the threshold detection module (2), the output end of the first switch unit (31) is connected with the input end of the second switch unit (32), and the output end of the second switch unit (32) is connected with the corresponding input end of the control module (5).
4. The power-on detection circuit for an electric energy meter according to claim 3, wherein,
the first switch unit (31) comprises a first capacitor C1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and an NPN triode Q1, one end of the first capacitor C1 is connected with the output end of the threshold detection module (2), the other end of the first capacitor C1 is connected with the third resistor R3 in series and then grounded, a connecting point of the first capacitor C1 and the third resistor R3 is connected with the base electrode of the Q1 in series and then connected with the fourth resistor R4, the emitter electrode of the Q1 is grounded, and the collector electrode is connected with the second power supply (12) of the power supply module (1) in series and then connected with the fifth resistor R5.
5. The power-on detection circuit for an electric energy meter according to claim 4, wherein,
the second switch unit (32) comprises a sixth resistor R6, a PNP triode Q2 and a seventh resistor R7, wherein a connection point of a collector electrode of the Q1 and the fifth resistor R5 is used as an output of the first switch unit (31) to be connected with a base electrode of the Q2, an emitter electrode of the Q2 is connected with the second power supply (12), the collector electrode of the Q2 is connected with the seventh resistor R7 in series and then grounded, and a connection point of the collector electrode of the Q2 and the seventh resistor R7 is output of the second switch unit (32) and is used as an output of the start pulse module (3) to be connected with a corresponding input end of the control module (5).
6. The power-on detection circuit of the electric energy meter according to claim 1, wherein the voltage detection module (4) comprises an eighth resistor R8, an NPN triode Q3 and a ninth resistor R9, one end of the eighth resistor R8 is connected with the output of the threshold detection module (2), the other end of the eighth resistor R8 is connected with the base electrode of the Q3, the emitter electrode of the Q3 is grounded, the emitter electrode of the Q3 is connected with the ninth resistor R9 in series and then is connected with a second power supply (12) of the power supply module (1), and a connection point of the emitter electrodes of the ninth resistor R9 and the Q3 is used as the output of the voltage detection module (4).
7. The power-on detection circuit of the electric energy meter according to claim 1, wherein the power supply module (1) comprises a first power supply (11) and a second power supply (12), and the first power supply (11) is a direct current power supply output by an AC/DC power supply module of the electric energy meter; the second power supply (12) is a direct current power supply which is provided by the direct current power supply which is subjected to voltage reduction and voltage stabilization of the first power supply (11) and the battery power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223443224.9U CN220105273U (en) | 2022-12-22 | 2022-12-22 | Power-on detection circuit of electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223443224.9U CN220105273U (en) | 2022-12-22 | 2022-12-22 | Power-on detection circuit of electric energy meter |
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| CN220105273U true CN220105273U (en) | 2023-11-28 |
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| CN202223443224.9U Active CN220105273U (en) | 2022-12-22 | 2022-12-22 | Power-on detection circuit of electric energy meter |
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