CN111525542A - Power supply method for safely storing data of intelligent electric energy meter - Google Patents
Power supply method for safely storing data of intelligent electric energy meter Download PDFInfo
- Publication number
- CN111525542A CN111525542A CN202010223034.2A CN202010223034A CN111525542A CN 111525542 A CN111525542 A CN 111525542A CN 202010223034 A CN202010223034 A CN 202010223034A CN 111525542 A CN111525542 A CN 111525542A
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- power supply
- supply module
- electric energy
- mcu
- triode
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Abstract
The invention discloses a power supply method for safely storing data of an intelligent electric energy meter, which comprises the steps that a mains supply module, an ultra-power supply module and a battery power supply module which are arranged in the electric energy meter are connected to an MCU power supply module for switching power supply of an MCU of the electric energy meter under the condition that a mains supply is power-off through a safe power supply control circuit; the safe power supply control circuit comprises a capacitor matrix delay circuit module which is connected to the base electrode of a triode and is provided with a group of energy storage capacitors, and the energy storage capacitors are switched on or off by a circuit controller connected with the MCU; the emitting electrode of the triode is connected to the grid electrode of an MOS (metal oxide semiconductor) tube, the drain electrode of the MOS tube is connected to the MCU power supply module, the super power supply module is connected to the source electrode of the MOS tube, and the commercial power supply module and the battery power supply module are respectively connected to the collector electrode of the triode through a diode; the invention can provide temporary electric energy which has enough duration and is stable and used for storing data for the MCU when the electric energy meter is powered off.
Description
Technical Field
The invention relates to the technical field of electric energy meters, in particular to a power supply method for safely storing data of an intelligent electric energy meter.
Background
The novel electric energy meter adopts physical separation of legal measurement and illegal measurement according to the requirements of IR46 standard, and legal measurement departments require high reliability and long service life and do not allow software upgrading. The legal measurement comprises legal data such as electric quantity, a clock and the like, a battery is only required to supply power for the clock and cannot supply power for an MCU (microprogrammed control Unit) of the electric energy meter, and the internal clock is maintained to work correctly for not less than 10 years after power failure; the metering part requires to store forward and reverse active electric energy, measurement data of electric parameters, freezing data and the like every minute. The electric energy meter needs to load or store a large amount of data in the power-on or power-off process, and especially needs to provide enough power supply time for the MCU when storing a large amount of data in the power-off condition.
In the prior art, two methods are generally used for storing data when an electric energy meter is powered off, one method is to adopt a low-power-consumption program mode, an MCU is in a dormant or shutdown state and is powered by a backup power supply such as a battery, the data is stored in an RAM, and the data is stored by commercial power after the MCU is powered on; the other method is to rapidly detect the power failure and rely on temporary power storage such as an electrolytic capacitor, and the temporary power storage is used for storing a small amount of data for the MCU. Both of these methods have significant disadvantages: the MCU is reset possibly caused by factors such as external interference by adopting the MCU low-power-consumption program mode, the risk of losing the data stored in the RAM exists, the battery is used for supplying power to run low power consumption and storing the data, the service life of the battery is shortened, and the risk of failing to achieve the age limit required by maintaining the clock to be correct in power failure exists; another method relying on temporary power storage such as an electrolytic capacitor, the capacitance value of the electrolytic capacitor gradually decreases with the increase of the service time of the electric energy meter, and there is a risk that a stable power supply capability may not be provided for a sufficient period of time.
Disclosure of Invention
In order to solve the problems, the invention provides a power supply method and a power supply device for safely storing data of an intelligent electric energy meter, and aims to provide temporary electric energy for storing data for an MCU (microprogrammed control unit) for enough time and stably when the electric energy meter is powered off, so that the safety of storing the data of the electric energy meter is improved.
The specific technical scheme is as follows:
a power supply method for safely storing data of an intelligent electric energy meter comprises the following steps:
(1) the electric energy meter is respectively provided with a mains supply module, an ultra-power supply module and a battery power supply module, and the mains supply module, the ultra-power supply module and the battery power supply module are connected to an MCU power supply module for switching power supply of an MCU of the electric energy meter under the condition that a mains supply is power-off through a safe power supply control circuit;
(2) the safe power supply control circuit comprises a capacitor matrix delay circuit module with a group of energy storage capacitors, the group of energy storage capacitors are connected with the base electrode of a triode through a resistor R1, a circuit controller which is respectively connected or disconnected with capacitors in the group of energy storage capacitors is arranged on a circuit which is connected between the group of energy storage capacitors and the base electrode of the triode, and the circuit controller is connected with an MCU of an electric energy meter; the emitter of the triode is connected to the grid of an MOS (metal oxide semiconductor) tube, the drain of the MOS tube is connected to an MCU (microprogrammed control unit) power supply module, the super-power supply module is connected to the source of the MOS tube, and the mains supply module and the battery power supply module are respectively connected to the collector of the triode through a diode;
(3) the MCU of electric energy meter constantly detects the power supply condition of mains supply module, and MCU passes through under the commercial power-off condition circuit controller switch-on a set of energy storage electric capacity with circuit between the base of triode does the triode provides the base current, utilizes simultaneously to be connected to the battery power module of triode collecting electrode provides the length of RC time constant for the MOS pipe, provides normal operating voltage for MCU power supply module by super power supply module, ensures the stable and reliable of the power supply voltage of electric energy meter MCU when the save data under the commercial power-off condition.
Preferably, the triode is an NPN triode, and the MOS transistor is an NMOS transistor.
Preferably, the group of energy storage capacitors are arranged in parallel, one end of each group of energy storage capacitors arranged in parallel is grounded, the other end of each group of energy storage capacitors is sequentially connected with the line controller and the resistor R1, and the resistor R1 is connected with the base electrode of the triode.
Preferably, the super power supply module includes ultracapacitor system and connects ultracapacitor system's super charging circuit, mains supply module connects super charging circuit is in order to be used for ultracapacitor system charges, mains supply module connects super charging circuit is in order to be used for super power supply module's ultracapacitor system charges.
Preferably, the super power supply module is connected to the source of the MOS transistor through a resistor R2.
A power supply device for safely storing data of an electric energy meter comprises a mains supply module, an ultra-power supply module, a battery power supply module, an MCU power supply module and a safe power supply control circuit, wherein the ultra-power supply module comprises a super capacitor and an ultra-power charging circuit connected with the super capacitor, the mains supply module is connected with the ultra-power charging circuit to charge the super capacitor, the mains supply module and the ultra-power supply module are respectively connected to the MCU power supply module through the safe power supply control circuit to supply power to the MCU of the electric energy meter, the safe power supply control circuit comprises a capacitance matrix delay circuit module, a triode and an MOS (metal oxide semiconductor) transistor, the mains supply module is connected to a collector electrode of the triode through a diode D1, the battery power supply module is connected with an electric energy meter MCU clock unit, and the battery power supply module is also connected to the collector electrode of the triode through a diode D2, the base electrode of the triode is connected with the capacitor matrix delay circuit module, the emitting electrode of the triode is connected with the drain electrode of the MOS tube, the super-power supply module is connected with the source electrode of the MOS tube, and the drain electrode of the MOS tube is connected with the MCU power supply module.
Preferably, the triode is an NPN triode, and the MOS transistor is an NMOS transistor.
Preferably, the capacitor matrix delay circuit module includes a group of energy storage capacitors connected to the resistor R1 on the base of the triode and the connecting resistor R1, and after the group of energy storage capacitors are connected in parallel, one end of each energy storage capacitor is grounded, and the other end of each energy storage capacitor is connected to the resistor R1 of the triode; and a line controller used for controlling the connection or disconnection between the group of energy storage capacitors and the resistor R1 is arranged between the group of energy storage capacitors and a connecting line of the resistor R1, and the line controller is connected with an MCU of an electric energy meter.
Preferably, the number of capacitors in the group of energy storage capacitors is four.
Preferably, the super power supply module is connected with the source of the MOS transistor through a resistor R1.
The invention has the beneficial effects that:
firstly, according to the power supply method for safely storing data of the intelligent electric energy meter, the capacitor matrix delay circuit module, the NPN triode and the NMOS tube are arranged in the safe power supply control circuit, the battery power supply module is used for providing enough duration of RC time constant for the NMOS tube, and the super power supply module is used for providing normal working voltage required by the MCU for the MCU power supply module, so that a stable and reliable temporary power supply is provided for safely storing data of the MCU under the condition of power failure.
Secondly, according to the power supply method for safely storing data of the intelligent electric energy meter, the capacitor matrix delay circuit module can set different durations of RC time constants according to the requirements of data storage of different scales, so that zero-limit battery consumption can be realized to the maximum extent.
Drawings
Fig. 1 is a schematic diagram of the general architecture of a power supply method for safely storing data of an intelligent electric energy meter according to the present invention;
fig. 2 is a specific embodiment of fig. 1.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
fig. 1 to 2 show an embodiment of a power supply method for safely storing data of an intelligent electric energy meter according to the present invention, which includes the following steps:
(1) the electric energy meter is respectively provided with a mains supply module, an ultra-power supply module and a battery power supply module, and the mains supply module, the ultra-power supply module and the battery power supply module are connected to an MCU power supply module for switching power supply of an MCU of the electric energy meter under the condition that a mains supply is power-off through a safe power supply control circuit;
(2) the safe power supply control circuit comprises a capacitor matrix delay circuit module with a group of energy storage capacitors, the group of energy storage capacitors are connected with the base electrode of a triode through a resistor R1, a circuit controller which is respectively connected or disconnected with capacitors in the group of energy storage capacitors is arranged on a circuit which is connected between the group of energy storage capacitors and the base electrode of the triode, and the circuit controller is connected with an MCU of an electric energy meter; the emitter of the triode is connected to the grid of an MOS (metal oxide semiconductor) tube, the drain of the MOS tube is connected to an MCU (microprogrammed control unit) power supply module, the super-power supply module is connected to the source of the MOS tube, and the mains supply module and the battery power supply module are respectively connected to the collector of the triode through a diode;
(3) the MCU of electric energy meter constantly detects the power supply condition of mains supply module, and MCU passes through under the commercial power-off condition circuit controller switch-on a set of energy storage electric capacity with circuit between the base of triode does the triode provides the base current, utilizes simultaneously to be connected to the battery power module of triode collecting electrode provides the length of RC time constant for the MOS pipe, provides normal operating voltage for MCU power supply module by super power supply module, ensures the stable and reliable of the power supply voltage of electric energy meter MCU when the save data under the commercial power-off condition.
Preferably, the triode is an NPN triode, and the MOS transistor is an NMOS transistor.
Preferably, the group of energy storage capacitors are arranged in parallel, one end of each group of energy storage capacitors arranged in parallel is grounded, the other end of each group of energy storage capacitors is sequentially connected with the line controller and the resistor R1, and the resistor R1 is connected with the base electrode of the triode.
Preferably, the super power supply module includes ultracapacitor system and connects ultracapacitor system's super charging circuit, mains supply module connects super charging circuit is in order to be used for ultracapacitor system charges, mains supply module connects super charging circuit is in order to be used for super power supply module's ultracapacitor system charges.
Preferably, the super power supply module is connected to the source of the MOS transistor through a resistor R2.
Example 2:
a device adopting the power supply method for safely storing data of the electric energy meter in embodiment 1 comprises a mains supply module, an ultra-power supply module, a battery power supply module, an MCU power supply module and a safe power supply control circuit, wherein the ultra-power supply module comprises a super capacitor and an ultra-power charging circuit connected with the super capacitor, the mains supply module is connected with the ultra-power charging circuit to charge the super capacitor, the mains supply module and the ultra-power supply module are respectively connected to the MCU power supply module through the safe power supply control circuit to supply power to the MCU of the electric energy meter, the safe power supply control circuit comprises a capacitance matrix delay circuit module, a triode and an MOS (metal oxide semiconductor) tube, the mains supply module is connected to a collector electrode of the triode through a diode D1, and the battery power supply module is connected with an electric energy meter MCU clock unit, the battery power supply module is further connected to a collector electrode of the triode through a diode D2, a base electrode of the triode is connected with the capacitance matrix delay circuit module, an emitting electrode of the triode is connected with a drain electrode of the MOS tube, the super-power supply module is connected with a source electrode of the MOS tube, and the drain electrode of the MOS tube is connected with the MCU power supply module.
Preferably, the triode is an NPN triode, and the MOS transistor is an NMOS transistor.
Preferably, the capacitor matrix delay circuit module includes a group of energy storage capacitors connected to the resistor R1 on the base of the triode and the connecting resistor R1, and after the group of energy storage capacitors are connected in parallel, one end of each energy storage capacitor is grounded, and the other end of each energy storage capacitor is connected to the resistor R1 of the triode; and a line controller used for controlling the connection or disconnection between the group of energy storage capacitors and the resistor R1 is arranged between the group of energy storage capacitors and a connecting line of the resistor R1, and the line controller is connected with an MCU of an electric energy meter.
Preferably, the number of capacitors in the group of energy storage capacitors is four.
Preferably, the super power supply module is connected with the source of the MOS transistor through a resistor R1.
In fig. 2, the voltage VCC of the utility power supply module 11 is reduced, rectified, filtered and stabilized to obtain the operating voltage VMCU of the MCU power supply module, VBATB is the super-power voltage of the super-power supply module, the line controller is Ctr1 and Ctr2, the MCU controls the energy storage capacitor to be turned on for 1-4 channels according to the size and time of the data to be stored before power failure, so as to ensure that the battery voltage VBAT of the battery power supply module provides the RC time constant for the NMOS transistor after the VCC is powered down, and the super-power voltage VBATB of the super-power supply module provides the MCU with the operating voltage VMCU of the power supply module, thereby ensuring stable and reliable power supply voltage during power failure storage.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A power supply method for safely storing data of an intelligent electric energy meter is characterized by comprising the following steps:
(1) the electric energy meter is respectively provided with a mains supply module, an ultra-power supply module and a battery power supply module, and the mains supply module, the ultra-power supply module and the battery power supply module are connected to an MCU power supply module for switching power supply of an MCU of the electric energy meter under the condition that a mains supply is power-off through a safe power supply control circuit;
(2) the safe power supply control circuit comprises a capacitor matrix delay circuit module with a group of energy storage capacitors, the group of energy storage capacitors are connected with the base electrode of a triode through a resistor R1, a circuit controller which is respectively connected or disconnected with capacitors in the group of energy storage capacitors is arranged on a circuit which is connected between the group of energy storage capacitors and the base electrode of the triode, and the circuit controller is connected with an MCU of an electric energy meter; the emitter of the triode is connected to the grid of an MOS (metal oxide semiconductor) tube, the drain of the MOS tube is connected to an MCU (microprogrammed control unit) power supply module, the super-power supply module is connected to the source of the MOS tube, and the mains supply module and the battery power supply module are respectively connected to the collector of the triode through a diode;
(3) the MCU of electric energy meter constantly detects the power supply condition of mains supply module, and MCU passes through under the commercial power-off condition circuit controller switch-on a set of energy storage electric capacity with circuit between the base of triode does the triode provides the base current, utilizes simultaneously to be connected to the battery power module of triode collecting electrode provides the length of RC time constant for the MOS pipe, provides normal operating voltage for MCU power supply module by super power supply module, ensures the stable and reliable of the power supply voltage of electric energy meter MCU when the save data under the commercial power-off condition.
2. The power supply method for safely storing data of the intelligent electric energy meter according to claim 1, wherein the triode is an NPN triode, and the MOS transistor is an NMOS transistor.
3. The power supply method for safely storing data of an intelligent electric energy meter according to claim 1, wherein the group of energy storage capacitors are arranged in parallel, one end of each group of energy storage capacitors arranged in parallel is grounded, the other end of each group of energy storage capacitors is sequentially connected with the line controller and the resistor R1, and the resistor R1 is connected with the base of the triode.
4. The power supply method for safely storing data of the intelligent electric energy meter according to claim 1, wherein the super power supply module comprises a super capacitor and a super charging circuit connected with the super capacitor, the mains supply module is connected with the super charging circuit to charge the super capacitor, and the mains supply module is connected with the super charging circuit to charge the super capacitor of the super power supply module.
5. The power supply method for safely storing the data of the intelligent electric energy meter according to claim 1, wherein the super power supply module is connected to the source electrode of the MOS transistor through a resistor R2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010223034.2A CN111525542B (en) | 2020-03-26 | 2020-03-26 | Power supply method for safely storing data of intelligent electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010223034.2A CN111525542B (en) | 2020-03-26 | 2020-03-26 | Power supply method for safely storing data of intelligent electric energy meter |
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| CN111525542A true CN111525542A (en) | 2020-08-11 |
| CN111525542B CN111525542B (en) | 2021-10-22 |
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Cited By (1)
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| CN116707121A (en) * | 2023-08-10 | 2023-09-05 | 青岛鼎信通讯股份有限公司 | Electric energy meter clock nursing method, device and medium |
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| CN111525542B (en) | 2021-10-22 |
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