CN214794993U - Ammeter circuit and ammeter - Google Patents
Ammeter circuit and ammeter Download PDFInfo
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- CN214794993U CN214794993U CN202120156919.5U CN202120156919U CN214794993U CN 214794993 U CN214794993 U CN 214794993U CN 202120156919 U CN202120156919 U CN 202120156919U CN 214794993 U CN214794993 U CN 214794993U
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Abstract
The utility model provides an ammeter circuit and ammeter, wherein, the ammeter circuit includes power conversion circuit, power down detection circuit, electric capacity tank circuit, voltage stabilizing circuit, ammeter microprocessor and multiplexing circuit, when normal power up, voltage stabilizing circuit receives the first level signal work of multiplexing circuit output, and output the third DC power to ammeter microprocessor, when power down, ammeter microprocessor has handled the power down incident earlier, for example, the storage data, record power down time etc. after handling the power down incident, ammeter microprocessor output control signal, multiplexing circuit conversion output second level signal control voltage stabilizing circuit stop work, ammeter microprocessor enters the stop work state, and not low power consumption state, electric capacity tank circuit ends discharge, when receiving the wake-up signal, voltage stabilizing circuit work, electric capacity tank circuit's terminal voltage satisfies the wake-up condition, the meter is reliably awakened.
Description
Technical Field
The utility model belongs to the technical field of the ammeter, especially, relate to an ammeter circuit and ammeter.
Background
At present, a traditional electricity meter microprocessor supplies power through a capacitance energy storage circuit and a voltage stabilizing circuit, the electricity meter microprocessor is supplied with power through the voltage stabilizing circuit during power-on, the capacitance energy storage circuit stores energy, the capacitance energy storage circuit discharges power during power-off, a working power supply is output through the voltage stabilizing circuit, and after the electricity meter microprocessor processes relevant matters of power-off, the microprocessor enters a low power consumption state.
However, because the ammeter microprocessor is in a low power consumption state, after the power failure, the capacitor energy storage circuit continuously discharges, so that the capacitor energy storage circuit is insufficient in electric quantity, the voltage of the power input end of the voltage stabilizing circuit is too small, and when the ammeter needs to be awakened, the voltage stabilizing circuit cannot normally work, so that the ammeter microprocessor has a risk of being incapable of being awakened.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ammeter circuit aims at solving traditional ammeter circuit and has the problem that electric capacity energy storage circuit overdischarge leads to the ammeter can't be awaken up.
The embodiment of the utility model provides a first aspect provides an ammeter circuit, ammeter circuit includes power conversion circuit, falls electric detection circuitry, electric capacity tank circuit, voltage stabilizing circuit, ammeter microprocessor and multiplexing circuit;
the power input end of the power supply conversion circuit and the signal input end of the power failure detection circuit are connected in common to form the power input end of the electric meter circuit, the power output end of the power supply conversion circuit, the power end of the capacitive energy storage circuit, the power input end of the voltage stabilizing circuit and the first signal input end of the multiplexing circuit are interconnected, the power output end of the voltage stabilizing circuit is connected with the power end of the electric meter microprocessor, the first control end of the electric meter microprocessor is connected with the second signal input end of the multiplexing circuit, and the signal output end of the multiplexing circuit is connected with the controlled end of the voltage stabilizing circuit;
the power supply conversion circuit is used for converting an input first direct-current power supply into a second direct-current power supply and outputting the second direct-current power supply to the capacitor energy storage circuit, the voltage stabilizing circuit and the multiplexing circuit;
the multiplexing circuit is used for converting the voltage of the second direct-current power supply into a first level signal and outputting the first level signal to the voltage stabilizing circuit;
the voltage stabilizing circuit is used for working when the first level signal is received, converting the second direct-current power supply into a third direct-current power supply and outputting the third direct-current power supply to the electric meter microprocessor so as to enable the electric meter microprocessor to be powered on and work;
the capacitor energy storage circuit is used for charging and storing energy when receiving the second direct-current power supply and discharging when not receiving the second direct-current power supply;
the electric meter microprocessor is used for processing a power failure event when receiving the power failure detection signal output by the power failure detection circuit, and outputting a control signal to the multiplexing circuit after the power failure event is processed, so that the multiplexing circuit converts and outputs a second level signal to control the voltage stabilizing circuit to stop working.
In one embodiment, the electric meter circuit further comprises at least one wake-up circuit;
the first signal output end of the at least one path of wake-up circuit is respectively connected with the signal input end of the multiplexing circuit;
the wake-up circuit is used for outputting a wake-up signal to the multiplexing circuit according to the touch action of the user;
the multiplexing circuit is used for converting the wake-up signal into a first level signal to control the voltage stabilizing circuit to work, so that the voltage stabilizing circuit converts the second direct-current power supply output by the capacitive energy storage circuit into the third direct-current power supply to control the electricity meter microprocessor to work.
In one embodiment, the electric meter circuit comprises a wake-up circuit, the wake-up circuit further comprises a second signal output end, and the second signal output end of the wake-up circuit is connected with the signal end of the electric meter microprocessor;
the wake-up circuit is further configured to output a touch signal to the electric meter microprocessor according to a touch action of a user, so that the electric meter microprocessor executes a corresponding action.
In one embodiment, the wake-up circuit comprises a key, a first resistor, a second resistor, a third resistor and a first capacitor;
the first end of the key is connected with the power input end of the voltage stabilizing circuit, the second end of the key and the first end of the first resistor are connected together to form a first signal output end of the wake-up circuit, the second end of the first resistor, the first end of the second resistor, the first end of the third resistor and the first end of the first capacitor are interconnected, the second end of the second resistor and the second end of the first capacitor are all grounded, and the second end of the third resistor is a second signal output end of the wake-up circuit.
In one embodiment, the electric meter circuit further comprises at least one storage circuit, wherein the storage circuit comprises a memory and a switch circuit;
the power supply input end of the switch circuit is connected with the power supply output end of the voltage stabilizing circuit, the power supply output end of the switch circuit is connected with the power supply end of the memory, and the signal end of the memory and the controlled end of the switch circuit are respectively connected with the signal end of the ammeter microprocessor;
the electricity meter microprocessor is used for:
when the power-on works, the switching circuit is controlled to be conducted and communicated with the memory;
and after the power failure detection signal is received and the power failure event is processed, controlling the switching circuit to be switched off.
In one embodiment, the power conversion circuit includes a DC/DC power chip, and the power input terminal and the power output terminal of the DC/DC power chip are the power input terminal and the power output terminal of the DC/DC power chip, respectively.
In one embodiment, the voltage stabilizing circuit comprises a voltage stabilizer, and the power input end, the controlled end and the power output end of the voltage stabilizing circuit are respectively the power input end, the controlled end and the power output end of the voltage stabilizing circuit.
In one embodiment, the capacitive storage circuit comprises a fourth resistor and a super capacitor;
the first end of the fourth resistor is a power supply end of the capacitor energy storage circuit, the second end of the fourth resistor is connected with the first end of the super capacitor, and the second end of the super capacitor is grounded.
In one embodiment, the multiplexing circuit includes a first diode, a second diode, a third diode, a second capacitor, a fifth resistor, and a sixth resistor;
the anode of the first diode is the first signal input end of the multiplexing circuit, the anode of the second diode is the second signal input end of the multiplexing circuit, the anode of the third diode is the third signal input end of the multiplexing circuit, the cathode of the first diode, the cathode of the second diode, the cathode of the third diode, the first end of the fifth resistor and the first end of the second capacitor are interconnected, the second end of the fifth resistor and the second end of the sixth resistor are connected in common to form the signal output end of the multiplexing circuit, and the second end of the second capacitor and the second end of the sixth resistor are both grounded.
A second aspect of the embodiments of the present invention provides an electricity meter, which comprises the above-mentioned electricity meter circuit.
The embodiment of the utility model adopts the power supply conversion circuit, the power failure detection circuit, the capacitance energy storage circuit, the voltage stabilizing circuit, the ammeter microprocessor and the multiplexing circuit to form the ammeter circuit, when the ammeter is normally powered on, the voltage stabilizing circuit receives the first level signal output by the multiplexing circuit to work and outputs a third direct current power supply to the electric meter microprocessor, when the power is off, the electric meter microprocessor firstly processes the power-off event, such as storing data, recording power-off time and the like, after the power failure event is processed, the microprocessor of the electric meter outputs a control signal, the multiplexing circuit converts and outputs a second level signal to control the voltage stabilizing circuit to stop working, the microprocessor of the electric meter enters a working stop state instead of a low power consumption state, the capacitor energy storage circuit stops discharging, when the wake-up signal is received, the voltage stabilizing circuit works, the terminal voltage of the capacitor energy storage circuit meets the wake-up condition, and the ammeter is reliably awakened.
Drawings
Fig. 1 is a schematic diagram of a first structure of an electric meter circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of an electric meter circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of an electric meter circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an electric meter circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The utility model provides an in the first aspect, an ammeter circuit is provided.
As shown in fig. 1, fig. 1 is a first schematic structural diagram of an electric meter circuit provided in the embodiment of the present invention, in this embodiment, the electric meter circuit includes a power conversion circuit 10, a power failure detection circuit 20, a capacitor energy storage circuit 30, a voltage stabilizing circuit 40, an electric meter microprocessor 50, and a multiplexing circuit 60;
the power input end of the power conversion circuit 10 and the signal input end of the power failure detection circuit 20 are connected in common to form a power input end of the electric meter circuit, the power output end of the power conversion circuit 10, the power end of the capacitive energy storage circuit 30, the power input end of the voltage stabilizing circuit 40 and the first signal input end of the multiplexing circuit 60 are interconnected, the power output end of the voltage stabilizing circuit 40 is connected with the power end of the electric meter microprocessor 50, the first control end of the electric meter microprocessor 50 is connected with the second signal input end of the multiplexing circuit 60, and the signal output end of the multiplexing circuit 60 is connected with the controlled end of the voltage stabilizing circuit 40;
the power conversion circuit 10 is configured to convert an input first direct-current power into a second direct-current power and output the second direct-current power to the capacitor energy storage circuit 30, the voltage stabilizing circuit 40 and the multiplexing circuit 60;
a multiplexing circuit 60 for converting the voltage of the second dc power supply into a first level signal and outputting the first level signal to the voltage stabilizing circuit 40;
the voltage stabilizing circuit 40 is used for working when receiving the first level signal, converting the second direct current power supply into a third direct current power supply and outputting the third direct current power supply to the electric meter microprocessor 50, so that the electric meter microprocessor 50 is powered on to work;
the capacitor energy storage circuit 30 is used for charging and storing energy when receiving a second direct-current power supply and discharging when not receiving the second direct-current power supply;
and the electric meter microprocessor 50 is used for processing a power failure event when receiving the power failure detection signal output by the power failure detection circuit 20, and outputting a control signal to the multiplexing circuit 60 after the power failure event is processed, so that the multiplexing circuit 60 converts and outputs a second level signal to control the voltage stabilizing circuit 40 to stop working.
In this embodiment, the electric meter supplies power through the accessed mains supply or through a power module arranged in the electric meter, and outputs a first direct current power to the power conversion circuit 10 through a corresponding power conversion module, and further provides a working power supply for the electric meter microprocessor 50 through the voltage stabilizing circuit 40, and when the mains supply fails or the power module fails, the power failure detection circuit 20 outputs a power failure detection signal.
The power conversion circuit 10 is configured to convert an input first dc power into a second dc power, the second dc power is divided into three paths of outputs, one of the paths is output to a power input end of the voltage stabilizing circuit 40, the other path is output to the multiplexing circuit 60, the multiplexing circuit 60 converts a voltage of the second dc power into a first level signal to a controlled end of the voltage stabilizing circuit 40, the voltage stabilizing circuit 40 starts to operate and converts the second dc power into a third dc power, the electric meter microprocessor 50 receives the third dc power and then powers on, performs operations such as receiving of a sampling signal, storing data, calculating power, and the like, outputs the other path of the second dc power to the capacitive energy storage circuit 30 for charging and storing energy, and when a terminal voltage of the capacitive energy storage circuit 30 reaches a voltage of the second dc power, the capacitive energy storage circuit 30 stops charging.
When the power failure of the electric meter circuit is caused by the power failure of the commercial power or the power module, the power failure detection circuit 20 outputs a power failure detection signal to the electric meter microprocessor 50, and at the same time, due to the existence of the capacitive energy storage circuit 30, the voltage of the second direct current power supply received by the multiplexing circuit 60 still exists, the multiplexing circuit 60 continues to output the first level signal to control the voltage stabilizing circuit 40 to work, the capacitive energy storage circuit 30 discharges, the voltage stabilizing circuit 40 continues to output the third direct current power supply to the electric meter microprocessor 50, the electric meter microprocessor 50 starts to process the power failure event after receiving the power failure detection signal, including data storage, recording, other electric meter modules closing and the like, after the processed power-down event, the electric meter microprocessor 50 outputs a control signal to the multiplexing circuit 60, the multiplexing circuit 60 converts and outputs a second level signal to the voltage stabilizing circuit 40, the voltage stabilizing circuit 40 stops working, and the capacitive energy storage circuit 30 stops discharging.
When the electricity meter microprocessor 50 needs to be awakened again, the first level signal can be output again through the control multiplexing circuit 60, and then the voltage stabilizing circuit 40 is controlled to work again, at this time, because the capacitor energy storage circuit 30 is in short-time discharging after power failure, the terminal voltage and electric quantity of the capacitor energy storage circuit 30 are small in change, and reach the working standard of the input voltage of the voltage stabilizing circuit 40, the voltage stabilizing circuit 40 continues to convert the power supply output by the capacitor energy storage circuit 30 into a third direct-current power supply, and then the electricity meter microprocessor 50 is controlled to work on.
Meanwhile, after the mains supply is powered on or the power supply module is stable, the power supply conversion circuit 10 continues to output the second direct-current power supply, the multiplexing circuit 60 converts and outputs the first level signal to control the voltage stabilizing circuit 40 to work, and the whole electric meter circuit is recovered to be normal.
As shown in fig. 4, in an embodiment, the power failure detection circuit 20 includes a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5, the seventh resistor R7 and the eighth resistor R8 form a resistor divider circuit, and feed back a voltage signal to the meter microprocessor 50, and when the meter fails, the resistor divider circuit outputs a low level signal, i.e., a power failure detection signal, to the meter microprocessor 50.
The power conversion circuit 10 may adopt a buck-boost circuit, a DC/DC conversion circuit, and the like, as shown in fig. 4, in an embodiment, the power conversion circuit 10 includes a DC/DC power chip U1, and a power input end and a power output end of the DC/DC power chip U1 are a power input end and a power output end of the DC/DC power chip U1, respectively.
The voltage regulator 40 may employ a voltage regulator U2, a voltage conversion circuit, etc., as shown in fig. 4, in an embodiment, the voltage regulator 40 includes a voltage regulator U2, a power input terminal, a controlled terminal, and a power output terminal of the voltage regulator U2 are respectively a power input terminal, a controlled terminal, and a power output terminal of the voltage regulator 40, and the voltage regulator U2 performs a power conversion operation by operating or stopping the operation according to a level signal of the controlled terminal, and provides an operating power or stops outputting the operating power to the meter microprocessor 50.
In order to reduce the circuit size, as shown in fig. 4, in an embodiment, the capacitor energy storage circuit 30 includes a fourth resistor R4 and a super capacitor C3, a first end of the fourth resistor R4 is a power supply end of the capacitor energy storage circuit 30, a second end of the fourth resistor R4 is connected to a first end of the super capacitor C3, a second end of the super capacitor C3 is grounded, after the power conversion circuit 10 outputs the second dc power, the super capacitor C3 charges to store energy, and after power failure, the super capacitor C3 discharges and stops discharging after the voltage stabilizing circuit 40 stops operating.
In one embodiment, the first level signal is at a high level, the second level signal is at a low level, and the control signal is at a low level.
The embodiment of the present invention employs the power conversion circuit 10, the power failure detection circuit 20, the capacitive energy storage circuit 30, the voltage stabilizing circuit 40, the meter microprocessor 50 and the multiplexing circuit 60 to form a meter circuit, when the power is normally turned on, the voltage stabilizing circuit 40 receives the first level signal output by the multiplexing circuit 60 to work and outputs the third dc power to the meter microprocessor 50, when the power is turned off, the meter microprocessor 50 processes the power failure event first, such as storing data, recording the power failure time, etc., after the power failure event is processed, the meter microprocessor 50 outputs a control signal, the multiplexing circuit 60 converts the second level signal to output the second level signal to control the voltage stabilizing circuit 40 to stop working, the meter microprocessor 50 enters a stop working state, but not a low power consumption state, the capacitive energy storage circuit 30 stops discharging, when the wake-up signal is received, the voltage stabilizing circuit 40 works, the terminal voltage of the capacitive energy storage circuit 30 satisfies the wake-up condition, the meter is reliably awakened.
As shown in fig. 2, in one embodiment, the electric meter circuit further includes at least one wake-up circuit 70;
the first signal output end of at least one wake-up circuit 70 is respectively connected with the signal input end of the multiplexing circuit 60;
the wake-up circuit 70 is configured to output a wake-up signal to the multiplexing circuit 60 according to a touch action of a user;
and the multiplexing circuit 60 is configured to convert the wake-up signal into a first level signal to control the voltage stabilizing circuit 40 to operate, so that the voltage stabilizing circuit 40 converts the second dc power output by the capacitive energy storage circuit 30 into a third dc power to control the power-on operation of the meter microprocessor 50.
In this embodiment, when the electric meter microprocessor 50 needs to work again, a user wakes up the electric meter microprocessor 50 or the internal voltage stabilizing circuit 40 through the touch wake-up circuit 70, the wake-up circuit 70 outputs a wake-up signal according to a touch action of the user, the wake-up signal is converted into a first level signal through the multiplexing circuit 60, the voltage stabilizing circuit 40 starts to work, the capacitive energy storage circuit 30 continues to discharge, the voltage stabilizing circuit 40 performs power conversion on the second dc power supply output by the capacitive energy storage circuit 30, and outputs a third dc power supply to the electric meter microprocessor 50, and the electric meter microprocessor 50 is powered on to work.
With reference to fig. 3, in order to implement the function multiplexing of the electric meter circuit and simplify the circuit structure of the electric meter circuit, in an embodiment, the electric meter circuit includes a wake-up circuit 70, the wake-up circuit 70 further includes a second signal output terminal, and the second signal output terminal of the wake-up circuit 70 is connected to the signal terminal of the electric meter microprocessor 50;
the wake-up circuit 70 is further configured to output a touch signal to the electric meter microprocessor 50 according to the touch action of the user, so that the electric meter microprocessor 50 executes a corresponding action.
In this embodiment, the wake-up circuit 70 may reuse one of the touch modules of the electric meter circuit, such as a page selection button, a volume adjustment button, and the like, when the electric meter circuit is normally powered on, the user outputs a touch signal through the touch-control wake-up circuit 70, the electric meter microprocessor 50 executes corresponding actions, such as turning up and down pages, adjusting volume, and the like, and when the electric meter circuit needs to be wakened up again after power failure, the wake-up signal may be output to the multiplexing circuit 60 through the wake-up circuit 70, so as to implement function multiplexing of the wake-up circuit 70, simplify the circuit structure of the electric meter circuit, and reduce cost.
The wake-up circuit 70 may be implemented by a key switch, a touch switch, and the like, as shown in fig. 4, in an embodiment, the wake-up circuit 70 includes a key PB1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1;
the first end of the button PB1 is connected to a power input end of the voltage stabilizing circuit 40, the second end of the button PB1 and the first end of the first resistor R1 are connected together to form a first signal output end of the wake-up circuit 70, the second end of the first resistor R1, the first end of the second resistor R2, the first end of the third resistor R3 and the first end of the first capacitor C1 are interconnected, the second end of the second resistor R2 and the second end of the first capacitor C1 are both grounded, and the second end of the third resistor R3 is a second signal output end of the wake-up circuit 70.
When the electric meter circuit is normally powered on, a user outputs a touch signal through the touch button PB1 and the second end of the third resistor R3, the electric meter microprocessor 50 executes corresponding actions, such as up-down page turning, volume adjustment and the like, when the electric meter circuit needs to be awakened again after power failure, the user outputs an awakening signal to the multiplexing circuit 60 through the touch button PB1 and a connection node of the button PB1 and the first end of the first resistor R1, function multiplexing of the awakening circuit 70 is achieved, the circuit structure of the electric meter circuit is simplified, and cost is reduced.
The first resistor R1 and the second resistor R2 form a resistor divider circuit, and further output a first voltage and a second voltage corresponding to the touch signal and the wake-up signal, where the first voltage is a divided voltage of the second dc power output by the power conversion circuit 10, and the second voltage is a terminal voltage of the capacitive storage circuit 30.
As shown in fig. 3, in one embodiment, the electric meter circuit further includes at least one storage circuit, and the storage circuit includes a memory and a switch circuit, such as a first storage circuit 80 composed of a first switch circuit 81 and a first memory 82, a second storage circuit 90 composed of a second switch circuit 91 and a second memory 92, and the like;
the power input end of the switch circuit is connected with the power output end of the voltage stabilizing circuit 40, the power output end of the switch circuit is connected with the power end of the memory, and the signal end of the memory and the controlled end of the switch circuit are respectively connected with the signal end of the ammeter microprocessor 50;
an electricity meter microprocessor 50 for:
when the power-on works, the switching circuit is controlled to be conducted and communicated with the memory;
and after receiving the power failure detection signal and processing the power failure event, controlling the switching circuit to be switched off.
In the conventional electric meter circuit, the power end of each memory is directly connected with the power output end of the voltage stabilizing circuit 40 and performs data communication, storage, exchange and the like with the microprocessor, after power failure, the capacitor energy storage circuit 30 continuously supplies power to each memory and the electric meter microprocessor 50, so that discharge of the capacitor energy storage circuit 30 is intensified, the terminal voltage of the capacitor energy storage circuit 30 is rapidly reduced, when the electric meter microprocessor 50 needs to be awakened, the terminal voltage of the capacitor energy storage circuit 30 cannot meet the working requirement of the voltage stabilizing circuit 40, so that the electric meter microprocessor 50 cannot be awakened, in order to ensure that the electric meter microprocessor 50 can normally communicate with each memory, and simultaneously, the discharge speed of the capacitor energy storage circuit 30 is reduced, in the embodiment, a switch circuit is arranged between each memory and the voltage stabilizing circuit 40, during normal work, the electric meter microprocessor 50 controls the switch circuit to be conducted, and each memory normally works, after the power failure of the electric meter circuit, the electric meter microprocessor 50 controls the switch circuit to be turned off, so that the discharge is reduced, and the terminal voltage of the capacitive energy storage circuit 30 is ensured to meet the awakening condition.
The memory circuit can be set with one or more channels according to the requirement, and the memory can be FLASH memory, EEPROM memory, encryption chip, etc.
The switch circuit can adopt a switch device with a controlled on-off function, such as a relay, a switch tube, a breaker and the like.
As shown in fig. 4, in one embodiment, the multiplexing circuit 60 includes a first diode D1, a second diode D2, a third diode D3, a second capacitor C2, a fifth resistor R5, and a sixth resistor R6;
an anode of the first diode D1 is a first signal input terminal of the multiplexing circuit 60, an anode of the second diode D2 is a second signal input terminal of the multiplexing circuit 60, an anode of the third diode D3 is a third signal input terminal of the multiplexing circuit 60, a cathode of the first diode D1, a cathode of the second diode D2, a cathode of the third diode D3, a first end of the fifth resistor R5, and a first end of the second capacitor C2 are interconnected, a second end of the fifth resistor R5 and a second end of the sixth resistor R6 are connected in common to form a signal output terminal of the multiplexing circuit 60, and a second end of the second capacitor C2 and a second end of the sixth resistor R6 are both grounded.
In this embodiment, the diodes are used for signal isolation to prevent a level signal output by one of the modules from being fed back to the other module to cause an abnormal operation of the other module, when the power supply normally operates, the voltage of the second dc power supply output by the power conversion circuit 10 is divided by the fifth resistor R5 and the sixth resistor R6 to output a high level to the voltage regulator U2, the voltage regulator U2 performs power conversion operation, the second capacitor C2 is used for filtering, when the power fails, the capacitor energy storage circuit 30 discharges, the meter microprocessor 50 outputs a high level control signal to the second diode D2 after the power failure detection circuit 20 detects the power failure, the high level is divided by the fifth resistor R5 and the sixth resistor R6 to feed back the high level to the voltage regulator U2, the voltage regulator U2 continues the power conversion operation, after the meter microprocessor 50 has processed the power failure event, the meter microprocessor 50 outputs a low level control signal to the second diode D2, the low level passes through the second diode D2, and after voltage division is performed by the fifth resistor R5 and the sixth resistor R6, the low level is fed back to the voltage regulator U2, the voltage regulator U2 stops working, and the capacitive energy storage circuit 30 stops working.
With continued reference to FIG. 4, in one embodiment, the power meter circuit further includes a fourth diode D4, wherein an anode of the fourth diode D4, the power output terminal of the DC/DC power chip U1 and an anode of the first diode D1 are interconnected, and a cathode of the fourth diode D4 is connected to the power input terminal of the regulator 40.
In this embodiment, the voltage at the power output end of the DC/DC power chip U1 is dropped by the fourth diode D4 and then output to the voltage stabilizing circuit 40, and the voltage is used as a control signal at the first signal input end of the multiplexing circuit 60, and the fourth diode D4 plays a role of unidirectional conduction and simultaneously implements a voltage dropping function.
The utility model also provides an ammeter, this ammeter include the ammeter circuit, and the concrete structure of this ammeter circuit refers to above-mentioned embodiment, because this ammeter has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An ammeter circuit is characterized by comprising a power supply conversion circuit, a power failure detection circuit, a capacitive energy storage circuit, a voltage stabilizing circuit, an ammeter microprocessor and a multiplexing circuit;
the power input end of the power supply conversion circuit and the signal input end of the power failure detection circuit are connected in common to form the power input end of the electric meter circuit, the power output end of the power supply conversion circuit, the power end of the capacitive energy storage circuit, the power input end of the voltage stabilizing circuit and the first signal input end of the multiplexing circuit are interconnected, the power output end of the voltage stabilizing circuit is connected with the power end of the electric meter microprocessor, the first control end of the electric meter microprocessor is connected with the second signal input end of the multiplexing circuit, and the signal output end of the multiplexing circuit is connected with the controlled end of the voltage stabilizing circuit;
the power supply conversion circuit is used for converting an input first direct-current power supply into a second direct-current power supply and outputting the second direct-current power supply to the capacitor energy storage circuit, the voltage stabilizing circuit and the multiplexing circuit;
the multiplexing circuit is used for converting the voltage of the second direct-current power supply into a first level signal and outputting the first level signal to the voltage stabilizing circuit;
the voltage stabilizing circuit is used for working when the first level signal is received, converting the second direct-current power supply into a third direct-current power supply and outputting the third direct-current power supply to the electric meter microprocessor so as to enable the electric meter microprocessor to be powered on and work;
the capacitor energy storage circuit is used for charging and storing energy when receiving the second direct-current power supply and discharging when not receiving the second direct-current power supply;
the electric meter microprocessor is used for processing a power failure event when receiving the power failure detection signal output by the power failure detection circuit, and outputting a control signal to the multiplexing circuit after the power failure event is processed, so that the multiplexing circuit converts and outputs a second level signal to control the voltage stabilizing circuit to stop working.
2. An electricity meter circuit in accordance with claim 1 further comprising at least one wake-up circuit;
the first signal output end of the at least one path of wake-up circuit is respectively connected with the signal input end of the multiplexing circuit;
the wake-up circuit is used for outputting a wake-up signal to the multiplexing circuit according to the touch action of the user;
the multiplexing circuit is used for converting the wake-up signal into a first level signal to control the voltage stabilizing circuit to work, so that the voltage stabilizing circuit converts the second direct-current power supply output by the capacitive energy storage circuit into the third direct-current power supply to control the electricity meter microprocessor to work.
3. An electricity meter circuit as in claim 2, wherein said electricity meter circuit includes a wake-up circuit, said wake-up circuit further including a second signal output, said wake-up circuit second signal output being connected to said signal terminal of said electricity meter microprocessor;
the wake-up circuit is further configured to output a touch signal to the electric meter microprocessor according to a touch action of a user, so that the electric meter microprocessor executes a corresponding action.
4. An ammeter circuit as in claim 3, wherein said wake-up circuit comprises a key, a first resistor, a second resistor, a third resistor, and a first capacitor;
the first end of the key is connected with the power input end of the voltage stabilizing circuit, the second end of the key and the first end of the first resistor are connected together to form a first signal output end of the wake-up circuit, the second end of the first resistor, the first end of the second resistor, the first end of the third resistor and the first end of the first capacitor are interconnected, the second end of the second resistor and the second end of the first capacitor are all grounded, and the second end of the third resistor is a second signal output end of the wake-up circuit.
5. An electricity meter circuit in accordance with claim 1 further comprising at least one memory circuit, said memory circuit comprising a memory and a switching circuit;
the power supply input end of the switch circuit is connected with the power supply output end of the voltage stabilizing circuit, the power supply output end of the switch circuit is connected with the power supply end of the memory, and the signal end of the memory and the controlled end of the switch circuit are respectively connected with the signal end of the ammeter microprocessor;
the electricity meter microprocessor is used for:
when the power-on works, the switching circuit is controlled to be conducted and communicated with the memory;
and after the power failure detection signal is received and the power failure event is processed, controlling the switching circuit to be switched off.
6. An electricity meter circuit as in claim 1, wherein said power conversion circuit includes a DC/DC power chip having power input and power output terminals respectively being the power input and power output terminals of said DC/DC power chip.
7. The metering circuit of claim 1, wherein the voltage stabilizing circuit comprises a voltage regulator having a power input, a controlled end, and a power output, respectively, of the voltage stabilizing circuit.
8. An electricity meter circuit in accordance with claim 1 wherein said capacitive storage circuit comprises a fourth resistor and a super capacitor;
the first end of the fourth resistor is a power supply end of the capacitor energy storage circuit, the second end of the fourth resistor is connected with the first end of the super capacitor, and the second end of the super capacitor is grounded.
9. An electricity meter circuit in accordance with claim 3, wherein said multiplexing circuit comprises a first diode, a second diode, a third diode, a second capacitor, a fifth resistor, and a sixth resistor;
the anode of the first diode is the first signal input end of the multiplexing circuit, the anode of the second diode is the second signal input end of the multiplexing circuit, the anode of the third diode is the third signal input end of the multiplexing circuit, the cathode of the first diode, the cathode of the second diode, the cathode of the third diode, the first end of the fifth resistor and the first end of the second capacitor are interconnected, the second end of the fifth resistor and the second end of the sixth resistor are connected in common to form the signal output end of the multiplexing circuit, and the second end of the second capacitor and the second end of the sixth resistor are both grounded.
10. An electricity meter comprising an electricity meter circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120156919.5U CN214794993U (en) | 2021-01-20 | 2021-01-20 | Ammeter circuit and ammeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120156919.5U CN214794993U (en) | 2021-01-20 | 2021-01-20 | Ammeter circuit and ammeter |
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| CN214794993U true CN214794993U (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023104196A1 (en) * | 2021-12-10 | 2023-06-15 | 广东省新一代通信与网络创新研究院 | Power failure alarm circuit for communication device, power failure alarm processing method for communication device, and communication device |
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2021
- 2021-01-20 CN CN202120156919.5U patent/CN214794993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023104196A1 (en) * | 2021-12-10 | 2023-06-15 | 广东省新一代通信与网络创新研究院 | Power failure alarm circuit for communication device, power failure alarm processing method for communication device, and communication device |
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