CN114006454A - Power management circuit, communication module, electric energy meter and power supply method of communication module - Google Patents
Power management circuit, communication module, electric energy meter and power supply method of communication module Download PDFInfo
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- CN114006454A CN114006454A CN202111208689.3A CN202111208689A CN114006454A CN 114006454 A CN114006454 A CN 114006454A CN 202111208689 A CN202111208689 A CN 202111208689A CN 114006454 A CN114006454 A CN 114006454A
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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
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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Abstract
The invention discloses a power management circuit, a communication module, an electric energy meter and a power supply method of the communication module. The power management circuit includes: the power storage device comprises a first voltage stabilizing circuit, a power storage circuit, a control circuit and a second voltage stabilizing circuit; the power supply method of the communication module comprises the following steps: when a power management circuit of the communication module receives a power supply voltage of a power supply, a first voltage stabilizing circuit converts the power supply voltage into a first stable voltage and outputs the first stable voltage to a control circuit and an electric storage circuit; when the electric storage circuit receives the first stable voltage, the farad capacitor is charged, and the charging voltage of the farad capacitor is output to the control circuit and the second voltage stabilizing circuit; when the received charging voltage reaches the preset voltage, the control circuit controls the second voltage stabilizing circuit to output a second stable voltage to the communication chip, so that the communication module is normally started, the electric energy meter can be matched with the communication chip on the basis of not increasing the power supply power of the original carrier electric energy meter, the production cost of the electric energy meter is saved, and the compatibility of the communication chip is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of power management, in particular to a power management circuit, a communication module, an electric energy meter and a power supply method of the communication module.
Background
The intelligent electric energy meter has the functions of intellectualization such as a remote communication function and an electricity larceny prevention function besides the metering function of the traditional electric energy meter, and is the development direction of the intelligent terminal of the end user of the future intelligent power grid.
The carrier communication mode that traditional single-phase electric energy meter adopted has that the wiring is complicated, and communication rate is slow, relies on the shortcomings such as electric wire netting quality, and the electric energy meter that adopts the 4G communication mode has walked into thousands of households by virtue of convenient, swift, intelligent advantage, receives the demand of different customers in market deeply.
Because the power supply power required by the 4G communication module in the process of starting up is relatively high, this characteristic can cause that a power supply with sufficient margin needs to be equipped in the design of the electric energy meter, so as to prevent the 4G communication module from failing to start up. But the power consumption of the 4G communication module is not particularly large during normal operation, so the power of the power supply is idle for most of the time, which causes waste of cost and space.
Disclosure of Invention
The embodiment of the invention provides a power management circuit, a communication module, an electric energy meter and a power supply method of the communication module, which aim to enable the electric energy meter to be adaptive to a 4G communication chip on the basis of not increasing the power supply power of the original carrier electric energy meter, save the production cost of the electric energy meter and improve the compatibility of the 4G communication chip.
In a first aspect, an embodiment of the present invention provides a power management circuit, including: the power storage device comprises a first voltage stabilizing circuit, a power storage circuit, a control circuit and a second voltage stabilizing circuit;
the input end of the first voltage stabilizing circuit is connected with a power supply, the output end of the first voltage stabilizing circuit is respectively connected with the input end of the electric storage circuit and the first input end of the control circuit, the output end of the electric storage circuit is respectively connected with the second input end of the control circuit and the first input end of the second voltage stabilizing circuit, and the output end of the control circuit is connected with the second input end of the second voltage stabilizing circuit; the output end of the second voltage stabilizing circuit is connected with the communication chip;
the first voltage stabilizing circuit is used for converting the power supply voltage of the power supply into a first stable voltage and providing the first stable voltage for the control circuit and the electric storage circuit;
the electric power storage circuit is used for charging the farad capacitor when receiving a first stable voltage and outputting the charging voltage of the farad capacitor to the control circuit and the second voltage stabilizing circuit;
the control circuit is used for controlling the second voltage stabilizing circuit to be started when the received charging voltage reaches a preset voltage;
the second voltage stabilizing circuit is used for outputting a second stabilized voltage to the communication chip.
In a second aspect, an embodiment of the present invention further provides a communication module, where the module includes: a power management circuit and a communication chip; the power management circuit is connected with the communication chip;
the power supply management circuit is used for converting the power supply voltage of the power supply into a second stable voltage and providing the second stable voltage for the communication chip;
the communication chip is used for providing a communication function.
In a third aspect, an embodiment of the present invention further provides an electric energy meter, including an electric energy metering module, a single chip microcomputer, a display module, and a communication module; the electric energy metering module is used for metering the electricity consumption of a user; the single chip microcomputer is used for receiving and storing the electricity consumption, and the display module is used for displaying the electricity consumption; the communication module is used for communicating with external equipment.
In a fourth aspect, an embodiment of the present invention further provides a power supply method for a communication module, where the method includes: when a power management circuit of the communication module receives a power supply voltage of a power supply, the first voltage stabilizing circuit converts the power supply voltage into a first stable voltage and outputs the first stable voltage to the control circuit and the power storage circuit;
when the electric storage circuit receives a first stable voltage, the farad capacitor is charged, and the charging voltage of the farad capacitor is output to the control circuit and the second voltage stabilizing circuit;
and when the received charging voltage reaches a preset voltage, the control circuit controls the second voltage stabilizing circuit to output a second stable voltage to the communication chip so as to normally start the communication module.
According to the embodiment of the invention, when a power supply management circuit of the electric energy meter receives a power supply voltage of a power supply, a first voltage stabilizing circuit converts the power supply voltage into a first stable voltage and outputs the first stable voltage to a control circuit and an electric storage circuit; when the electric storage circuit receives a first stable voltage, the farad capacitor is charged, and the charging voltage of the farad capacitor is output to the control circuit and the second voltage stabilizing circuit; when the received charging voltage reaches a preset voltage, the control circuit controls the second voltage stabilizing circuit to output a second stable voltage to the communication chip, so that the communication module is normally started, sufficient power supply power can be provided for the 4G communication chip of the electric energy meter without increasing the power supply power of the original carrier electric energy meter, the normal starting of the communication module is ensured, the carrier electric energy meter can be adapted to the communication chip, the production cost of the electric energy meter is saved, and the compatibility of the 4G communication chip is also improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a power management circuit according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a first voltage regulator circuit according to one embodiment of the present invention;
FIG. 3 is a circuit diagram of a buck converter circuit in a first voltage regulator circuit according to a first embodiment of the present invention;
FIG. 4 is a circuit diagram of a power storage circuit according to a first embodiment of the present invention;
FIG. 5 is a circuit diagram of a control circuit according to a first embodiment of the present invention;
FIG. 6 is a circuit diagram of a second voltage regulator circuit according to one embodiment of the present invention;
fig. 7 is a schematic structural diagram of a communication module according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electric energy meter according to a third embodiment of the present invention;
fig. 9 is a flowchart of a power supply method of a communication module in the fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example one
Fig. 1 is a schematic structural diagram of a power management circuit according to an embodiment of the present invention. The embodiment can be applied to the condition of supplying power to the communication chip of the electric energy meter, and the device can be realized in a software and/or hardware mode and can be integrated in the electric energy meter.
As shown in fig. 1, the power management circuit 1 specifically includes: a first regulator circuit 11, an electric storage circuit 12, a control circuit 13, and a second regulator circuit 14;
an input end 11a of the first voltage stabilizing circuit 11 is connected with the power supply 2, an output end 11b of the first voltage stabilizing circuit is respectively connected with an input end 12a of the electric storage circuit 12 and a first input end 13a of the control circuit 13, an output end 12b of the electric storage circuit 12 is respectively connected with a second input end 13b of the control circuit 13 and a first input end 14a of the second voltage stabilizing circuit 14, and an output end 13c of the control circuit 13 is connected with a second input end 14b of the second voltage stabilizing circuit 14; the output end 14c of the second voltage stabilizing circuit 14 is connected with the communication chip 3;
the first voltage stabilizing circuit 11 is configured to convert a power supply voltage of a power supply into a first stable voltage, and provide the first stable voltage to the control circuit 13 and the electric storage circuit 12;
the electric storage circuit 12 is configured to charge a farad capacitor when receiving a first stable voltage, and output a charging voltage of the farad capacitor to the control circuit 13 and the second voltage stabilizing circuit 14;
the control circuit 13 is configured to control the second voltage stabilizing circuit 14 to be turned on when the received charging voltage reaches a preset voltage;
the second voltage stabilizing circuit 14 is used for outputting a second stabilized voltage to the communication chip 3.
In this embodiment, the operating principle of the power management circuit is as follows: after the electric energy meter is powered on, namely the power supply 2 starts to provide power supply voltage for the power management circuit, the first voltage stabilizing circuit 11 of the power management circuit 2 starts to work after receiving 12V direct-current voltage of the power supply, converts the 12V voltage into first stable voltage, and provides the first stable voltage for the electric storage circuit 12 and the control circuit 13, wherein the magnitude of the first stable voltage can be determined according to the working voltage of the electric storage circuit and the control circuit, and can be 5.3V voltage for example; under the action of the first stable voltage, the electric storage circuit 12 enters a working state to charge a farad capacitor in the electric storage circuit 12, the farad capacitor is gradually filled with the charge by adopting a constant-current first mode and a constant-voltage trickle second mode, the constant-current 100mA and the constant-voltage 5.3V are controlled by an IC (integrated circuit), the voltage of the farad capacitor can reach 5V after the farad capacitor is charged for 80s, the current flowing through the electric storage circuit 12 is controlled, and the average power consumption of a power management circuit is limited; the control circuit is connected with the electric storage circuit and used for monitoring the charging and discharging states of the farad capacitor and controlling the second voltage stabilizing circuit 14 to be started when the charging voltage of the farad capacitor reaches a preset voltage; by means of the anti-surge capacity of the farad capacitor, the second voltage stabilizing circuit 14 can instantly output power exceeding 3A/4V and supply power to a communication chip in the electric energy meter, so that the communication module is normally started, and the communication module of the electric energy meter is in a working state.
The communication chip may be a 4G communication chip or another communication chip requiring a higher power for starting up than the carrier communication method.
It is understood that the first voltage stabilizing circuit 11, the electric storage circuit 12, the control circuit 13 and the second voltage stabilizing circuit 14 in the embodiment of the present invention may be a circuit loose joint or an integrated circuit formed by a chip or a resistor, a capacitor, an inductor, a triode, a diode, or the like.
Because the power supply power needed by the 4G communication chip of the electric energy meter is larger in the starting process, the power supply management circuit provided by the embodiment of the invention can be directly suitable for the existing carrier electric energy meter, and can provide enough power supply power for the 4G communication chip of the electric energy meter without increasing the power supply power of the existing carrier electric energy meter, so that the normal starting of the communication module is ensured, the carrier electric energy meter can be adapted to the communication chip, the production cost of the electric energy meter is saved, and the compatibility of the 4G communication chip is also improved.
Based on the above technical solution, fig. 2 is a circuit diagram of a first voltage stabilizing circuit according to an embodiment of the present invention.
The first voltage stabilizing circuit 11 includes: a first diode V1, a first capacitor C1, a second capacitor C2, a buck conversion circuit 111, a first resistor R1, a second resistor R2, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6; an input end of the first diode V1 is used as an input end 11a of the first voltage stabilizing circuit 11, an output end of the first diode V1 is respectively connected with a first end of a first capacitor C1 and a first end of a second capacitor C2, a second end of the first capacitor C1 and a second end of a second capacitor C2 are both grounded, a first end of a second capacitor C2 is connected with an input end 111a of the voltage-reducing type change circuit 111, a first output end 111b of the voltage-reducing type change circuit is respectively connected with a first end of a first resistor R1, a first end of a third capacitor C3, a first end of a fourth capacitor C4 and a first end of a fifth capacitor C5, a second output end 111C of the voltage-reducing type change circuit 111 is respectively connected with a second end of a first resistor R1 and a first end of a second resistor R2, a second end of a second resistor R2 is respectively connected with a second end of a third capacitor C3, a second end of a fourth capacitor C4 and a second end of a sixth capacitor C5, and is grounded, and the first terminal of the fifth capacitor C5 is used as the output terminal 11b of the first voltage stabilizing circuit.
The first diode V1 may be a schottky diode or other diode for input power protection, including current limiting or reverse connection prevention; the first resistor R1 and the second resistor R2 may be low temperature drift precision resistors or other resistors for adjusting output feedback. The basic characteristic of the step-down type change circuit is that the output voltage is lower than the input voltage through a direct current to direct current circuit.
Alternatively, FIG. 3 is a circuit diagram of a buck converter circuit in a first voltage regulator circuit. The voltage reduction type change circuit comprises a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, an inductor L and a power chip U1, wherein the power chip U1 is a direct current-to-direct current power chip;
a voltage input pin C1 of the power chip U1 is used as an input end 111a of the buck-type change circuit 111, a voltage input pin and an enable pin of the power chip U2 are respectively connected with one end of the sixth capacitor C6, a second end of the sixth capacitor C6 is connected with a ground pin a4 of the power chip U1, a BS pin a3 of the power chip is connected with a first end of the seventh capacitor C7, second ends of an inductor connection feedback input pin a5 and a seventh capacitor C7 of the power chip U1 are both connected with a first end of an inductor L, a second end of the inductor L is connected with a first end of the eighth capacitor C8, a second end of the eighth capacitor C8 is connected with a voltage feedback input pin a6 of the power chip U1, a first end of the eighth capacitor C8 is used as a first output end 111b of the buck-type change circuit 111, and a second end of the eighth capacitor C8 is used as a buck-type second output end 111C of the buck-type change circuit 111.
In addition to the above technical solutions, fig. 4 is a circuit diagram of an electric storage circuit according to an embodiment of the present invention.
The electric storage circuit 12 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a ninth capacitor C9, a tenth capacitor C10 and a charge management chip U2; the ninth capacitor C9 and the tenth capacitor C10 are farad capacitors;
an operating power supply input pin b4 of the charging management chip U2 is connected with a first end of a fourth resistor, a preset current pin b3 of the charging management chip U2 is connected with a first end of a third resistor R3, a charging current setting pin b1 of the charging management chip U2 is connected with a second end of the fourth resistor R4, the charging current setting pin b1 serves as an input end of the electric storage circuit 12, a ground pin b2 of the charging management chip U2 and a second end of the third resistor R3 are grounded, and a voltage feedback input pin b6 of the charging management chip U2 is connected with a first end of a fifth resistor R5; the charging power supply output pin b5 of the charging management chip U2 is connected to the second end of the fifth resistor R5 and the anode of the ninth capacitor C9, respectively, the cathode of the ninth capacitor C9 is connected to the anode of the tenth capacitor C10, the cathode of the tenth capacitor C10 is grounded, and the anode of the ninth capacitor C9 is used as the output end of the electric storage circuit 12.
The resistance value of the third resistor R3 determines the charging current value, and the formula I is 1200/R3; the value of the fifth resistor R5 determines the charging voltage value, and satisfies the formula V4.2 +3.61 × R5/106；
On the basis of the above technical solution, fig. 5 is a circuit diagram of a control circuit in an embodiment of the present invention.
The control circuit 13 includes: a second diode V2, an eleventh capacitor R11, a twelfth capacitor R12, a programmable microprocessor chip U3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a triode V3;
an input end of a second diode V2 is used as a first input end 13a of the control circuit 13, an output end of the second diode V2 is respectively connected with a first end of an eleventh capacitor C11 and a first end of a twelfth capacitor C12, a second end of the eleventh capacitor C11 and a second end of the twelfth capacitor C12 are both grounded, a working voltage input pin C1 of the programmable micro-processing chip U3 is connected with a first end of the twelfth capacitor C12, an analog input pin C4 of the programmable micro-processing chip U3 is respectively connected with a first end of an eighth resistor R8 and a first end of a ninth resistor R9, a second end of an eighth resistor R8 is grounded, a second end of the ninth resistor R9 is used as a second input end 13b of the control circuit 13, a control output pin C3 of the programmable micro-processing chip U3 is connected with a first end of a sixth resistor R6, and a second end of the sixth resistor R6 is respectively connected with a base of a seventh resistor R7, the second end of the seventh resistor R7 is connected to the emitter e of the transistor and grounded, the collector c of the transistor is used as the output terminal 13c of the control circuit 13, and the ground pin c2 of the programmable microprocessor chip U3 is grounded.
Wherein, the second diode V2 may be a schottky diode or other diode; the sixth resistor R6 and the seventh resistor R7 can be low-temperature drift precision resistors or other resistors and are used for farad capacitor voltage sampling; the transistor V3 may be a field effect transistor or other transistor, and the eighth resistor R8, the ninth resistor R9, and the transistor V3 form a control circuit for switching the second voltage stabilizing unit.
Based on the above technical solution, fig. 6 is a circuit diagram of a second voltage stabilizing circuit in an embodiment of the invention.
The second stabilizing circuit 14 includes: a third diode V4, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a low dropout linear regulator chip U4;
an input end of the third diode V4 is used as a first input end 14a of the second voltage stabilizing circuit 14, an output end of the third diode V4 is respectively connected with a first end of a thirteenth capacitor C13, a first end of a fourteenth capacitor C14, a first end of a tenth resistor R10 and a voltage input pin of the low dropout linear regulator chip U4, a second end of the thirteenth capacitor C13 and a second end of the fourteenth capacitor C14 are connected and grounded, a second end of the tenth resistor R10 is used as a second input end 14b of the second voltage stabilizing circuit 14, a second end of the tenth resistor R10 is connected with an enable pin of the low dropout linear regulator chip U4, a soft start pin of the low dropout linear regulator chip U4 is connected with a first end of a fifteenth capacitor C15, a voltage output pin of the low dropout linear regulator chip U4 is respectively connected with a first end of the eleventh resistor R11, a first end of a sixteenth capacitor C16 and a first end of a seventeenth capacitor C17, The first end of an eighteenth capacitor C18 is connected, the second end of an eleventh resistor R11 is connected to the first end of a twelfth resistor R12 and the output voltage regulation pin of the low dropout linear regulator chip U4, respectively, the voltage output pin of the low dropout linear regulator chip U4 serves as the output end of the second voltage regulator circuit, and the second end of the twelfth resistor R11, the second end of the fifteenth capacitor C15, the second end of a sixteenth capacitor C16, the second end of a seventeenth capacitor C17, the second end of an eighteenth capacitor C18 and the ground pin of the low dropout linear regulator chip U4 are all grounded.
Wherein, the third diode V4 may be a schottky diode or other diode; the eleventh resistor R11 and the twelfth resistor R12 may be low temperature drift precision resistors or other resistors for adjusting the output feedback value.
Example two
Fig. 7 is a schematic structural diagram of a communication module according to a second embodiment of the present invention. As shown in fig. 7, the communication module 70 includes a power management circuit 1 and a communication chip 3 according to the first embodiment; the power management module 1 is connected with the communication chip 3;
the power management circuit 1 is used for converting the power supply voltage of the power supply into a second stable voltage and providing the second stable voltage for the communication chip;
the communication chip 3 is used to provide a communication function.
The communication chip 3 may be any chip capable of providing a communication function, for example, a 4G communication chip, and the model of the communication chip is not limited in the embodiment of the present invention.
Because the power supply power required by the 4G communication chip in the starting process is larger than that required by the carrier communication module, the characteristic can cause that a power supply with enough margin needs to be prepared in the design of the electric energy meter so as to avoid the failure of starting the communication module. However, the power consumption of the communication chip is not particularly large during normal operation, so that the power of the power supply is idle for most of the time, which causes waste of cost and space. The communication module provided by the embodiment of the invention is adopted to directly replace the carrier communication module in the carrier electric energy meter, the 4G communication-based electric energy meter communication mode can be realized without increasing the power supply power of the original carrier electric energy meter, the production cost of the electric energy meter is saved, meanwhile, the 4G communication module can be suitable for electric energy meters with different power supply powers, and the compatibility of the 4G communication module is improved.
EXAMPLE III
Fig. 8 is a schematic structural diagram of an electric energy meter according to a third embodiment of the present invention. As shown in fig. 8, the electric energy meter includes an electric energy metering module 71, a single chip microcomputer 72, a display module 73, and a communication module 70 according to the second embodiment; the electric energy metering module 71 is used for metering the electricity consumption of a user; the single chip microcomputer 72 is used for receiving and storing the electricity consumption, and the display module 73 is used for displaying the electricity consumption; the communication module 70 is used for communicating with an external device.
Optionally, the communication module is arranged in the electric energy meter in a pluggable manner.
The external device may include a computer, a mobile terminal, a service center, and other devices or platforms.
The electric energy meter provided by the invention can communicate with external equipment through the communication module, so that the data communication function of the electric energy meter is enriched, the intellectualization of the electric energy meter is improved, and the communication module is arranged in the electric energy meter in a pluggable mode, so that the electric energy meter is convenient to replace and use.
Example four
Fig. 9 is a flowchart of a power supply method of a communication module according to a fourth embodiment of the present invention, where the present embodiment is applicable to a case where power is supplied to a communication module of an electric energy meter so as to normally start up the communication module of the electric energy meter, and the method may be executed by a power management circuit according to the fourth embodiment of the present invention, where the power management circuit may be integrated in the electric energy meter. The power management circuit includes: the power storage device comprises a first voltage stabilizing circuit, a power storage circuit, a control circuit and a second voltage stabilizing circuit.
As shown in fig. 9, the method specifically includes the following steps:
s910, when the power management circuit of the communication module receives the supply voltage of the power supply, the first voltage stabilizing circuit converts the supply voltage into a first stable voltage, and outputs the first stable voltage to the control circuit and the power storage circuit.
Based on the rated voltage of the electric energy meter, the power supply voltage of the power supply can be 12V of direct current supply voltage.
Specifically, when the power management circuit of the communication module receives the supply voltage of the power supply, that is, the first voltage stabilizing circuit receives the supply voltage, the first voltage stabilizing circuit is turned on to convert the supply voltage into the first stable voltage, so as to provide a stable power supply for the control circuit and the power storage circuit.
And S920, when receiving the first stable voltage, the electric storage circuit charges the farad capacitor, and outputs the charging voltage of the farad capacitor to the control circuit and the second voltage stabilizing circuit.
Specifically, when the electric storage circuit receives the first stable voltage output by the first voltage stabilizing circuit, the electric storage circuit starts to charge the farad capacitor in the electric storage circuit, the farad capacitor is charged gradually in a constant current first and then constant voltage trickle mode, and the charging constant current is 100mA and the constant voltage is 5.3V under the control of the IC. Meanwhile, the storage circuit outputs the charging voltage of the farad capacitor to the control circuit and the second voltage stabilizing circuit.
S930, when the received charging voltage reaches the preset voltage, the control circuit controls the second voltage regulator circuit to output a second stable voltage to the communication chip, so as to normally start the communication module.
Specifically, the control circuit receives the charging voltage of the farad capacitor output by the electric storage circuit, monitors the charging voltage of the farad capacitor, switches on the second voltage stabilizing circuit when the charging voltage reaches a preset voltage, enables the second voltage stabilizing unit to instantly output power exceeding 3A/4V by means of the anti-surge capacity of the farad capacitor, and outputs second stable voltage to the communication chip, so that the communication module of the electric energy meter is normally started, and the communication module of the electric energy meter can normally work. The preset voltage can be determined based on the working voltage of the communication chip, for example, the preset voltage can be 5V, and the farad capacitor voltage can reach 5V after the communication chip is charged for 80 s.
According to the technical scheme of the embodiment, when a power management circuit of the electric energy meter receives a power supply voltage of a power supply, the first voltage stabilizing circuit converts the power supply voltage into a first stable voltage and outputs the first stable voltage to a control circuit and an electric storage circuit; when the electric storage circuit receives a first stable voltage, the farad capacitor is charged, and the charging voltage of the farad capacitor is output to the control circuit and the second voltage stabilizing circuit; when the received charging voltage reaches a preset voltage, the control circuit controls the second voltage stabilizing circuit to output a second stable voltage to the communication chip, so that the communication module is normally started, zai can realize an electric energy meter communication mode based on 4G communication without increasing the power of the original carrier electric energy meter, the production cost of the electric energy meter is saved, meanwhile, the 4G communication module can be suitable for electric energy meters with different power powers, and the compatibility of the 4G communication module is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
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