CN213338644U - Power-down protection circuit and electric energy meter - Google Patents
Power-down protection circuit and electric energy meter Download PDFInfo
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- CN213338644U CN213338644U CN202022509938.XU CN202022509938U CN213338644U CN 213338644 U CN213338644 U CN 213338644U CN 202022509938 U CN202022509938 U CN 202022509938U CN 213338644 U CN213338644 U CN 213338644U
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Abstract
The utility model discloses a power down protection circuit and electric energy meter. Wherein, this power fail safe circuit includes: the input end of the sampling circuit is connected with the output end of the power supply module and is used for monitoring the output voltage of the power supply module and outputting a control signal when the output voltage of the power supply module is lower than a first threshold value; the input end of the main control chip is connected with the sampling circuit and is used for outputting a control instruction to the storage chip after the sampling circuit outputs a control signal; and the input end of the storage chip is connected with the main control chip and is used for triggering and storing the electric energy data of the electric energy meter based on the control instruction. Through the utility model discloses, can avoid electric energy data to lose, cause the problem that storage device damaged and data mistake, improve the reliability of electric energy meter operation.
Description
Technical Field
The utility model relates to an electron electric power technical field particularly, relates to a power down protection circuit and electric energy meter.
Background
With the development of local energy internet, energy devices are continuously increased, application scenes are more and more, and energy is digitized and informationized based on the requirement of energy management. In the use process of energy equipment, the condition of startup and shutdown can exist, application places such as severe radiation, high surge voltage and high pulse impact can also exist, and special protection needs to be carried out on the direct-current intelligent electric energy meter, namely normal power supply of a power supply module needs to be protected, and power failure storage and data protection are carried out on electric energy data acquired by an energy information sensor.
For example, when the bus voltage of the power supply system is powered down, the power down condition cannot be predicted, and the system state cannot be well controlled in advance, so that the condition that the load still works when the power supply voltage is reduced to be very low exists, but the storage chip is not in time to store electric energy data or fails to store the electric energy data, so that the storage device is damaged and the data error is caused, and the reliability of the product is greatly reduced. In the current circuit design, a data storage chip is not provided with a power failure protection circuit or a power failure storage circuit, and once a power supply system suddenly fails, electric energy data are damaged or lost.
Aiming at the problem that power data is damaged or lost due to sudden power failure of a power supply system in the prior art, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an in provide a power down protection circuit and electric energy meter to power supply system suddenly falls the electricity among the solution prior art, causes the problem that electric energy data damaged or lost.
In order to solve the technical problem, the utility model provides a power down protection circuit is applied to the electric energy meter, and this power down protection circuit includes:
the input end of the sampling circuit is connected with the output end of the power supply module and is used for monitoring the output voltage of the power supply module and outputting a control signal when the output voltage of the power supply module is lower than a first threshold value;
the input end of the main control chip is connected with the sampling circuit and is used for outputting a control instruction to the storage chip after the sampling circuit outputs a control signal;
and the input end of the storage chip is connected with the main control chip and is used for triggering and storing the electric energy data of the electric energy meter based on the control instruction.
Further, the sampling circuit includes:
the first end of the first sampling unit is connected with the output end of the power supply module, the second end of the first sampling unit is grounded, the output end of the first sampling unit is connected with the control end of the first switch, and the first sampling unit is used for outputting a first sampling voltage;
the first end of the first switch is connected with a voltage source, and the second end of the first switch is connected with the first end of the second sampling unit and is used for being switched on or switched off under the control of the first sampling voltage;
the second end of the second sampling unit is grounded, the output end of the second sampling unit is connected with the control end of the second switch, and the second sampling unit is used for outputting a second sampling voltage when the first switch is conducted;
the first end of the second switch is connected with the voltage source through a first resistor, the second end of the second switch is grounded, the first end of the second switch is connected with a line between the first resistors and is connected with the main control chip, and the second switch is used for being switched on under the driving of the second sampling voltage to control the sampling circuit to output a control instruction.
Further, the first sampling unit includes:
the second resistor and the third resistor are connected in series, the second resistor is connected with the power module, the third resistor is grounded, and a line between the second resistor and the third resistor is connected with the control end of the first switch.
Further, the second sampling unit includes:
the fourth resistor is connected with the second end of the first switch, the fifth resistor is grounded, and a line between the fourth resistor and the fifth resistor is connected with the control end of the second switch.
Further, the first switch is a PNP type triode.
Further, the second switch is an NPN-type triode.
Further, the power down protection circuit further includes:
and the first end of the capacitor is connected with the output end of the power supply module, and the second end of the capacitor is grounded.
The utility model also provides an electric energy meter, including above-mentioned power down protection circuit.
By applying the technical scheme of the utility model, the output voltage of the power supply module is monitored through the sampling circuit, and when the output voltage of the power supply module is lower than a first threshold value, a control signal is output; through the main control chip, after the sampling circuit outputs the control signal, a control instruction is output; so as to trigger the storage chip to store the electric energy data of the electric energy meter. The electric energy data in the power failure process can be stored in time when the system is powered down, the problems of storage device damage and data errors caused by electric energy data loss are avoided, and the operation reliability of the electric energy meter is improved.
Drawings
Fig. 1 is a block diagram of a power down protection circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a sampling circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the sampling units in the embodiments of the present invention, these sampling units should not be limited to these terms. These terms are only used to distinguish between different sampling units. For example, the first sampling unit may also be referred to as a second sampling unit, and similarly, the second sampling unit may also be referred to as a first sampling unit without departing from the scope of the embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.
Example 1
This embodiment provides a power down protection circuit, is applied to the electric energy meter, and fig. 1 is according to the utility model discloses power down protection circuit's structure chart, as shown in fig. 1, this power down protection circuit includes:
and the input end of the sampling circuit 1 is connected with the output end of the power supply module and is used for monitoring the output voltage of the power supply module and outputting a control signal when the output voltage of the power supply module is lower than a first threshold value.
The input end of the main control chip 2 is connected with the sampling circuit 1 and is used for outputting a control instruction after the sampling circuit outputs a control signal; and the input end of the storage chip 3 is connected with the main control chip 2 and is used for triggering and storing the electric energy data of the electric energy meter according to the control instruction output by the main control chip 2.
The sampling circuit 1 can be an AD sampling circuit, and the main control chip 2 can adopt an automatic ARM chip. The sampling circuit 1 is connected to a power supply module in a power supply system, which may be a DC-DC chip, such as an ICLMR16030DDAR, or a switching power supply chip, such as an IC _ SMPS _ LNK605, and its peripheral circuits. The power-down protection circuit further comprises a memory chip 3, and the memory chip 3 may be an EEPROM memory chip, for example, an IC AT24C16 of the FLASH series.
The power module is used for providing an output voltage Vout for a rear-stage circuit (namely a DC-DC chip or a circuit connected with the output end of the working power supply of the switching power supply chip) to supply power to a load. The power supply module is also connected with the input end of the sampling circuit 1;
the sampling circuit 1 is configured to output a control instruction according to a change of the output voltage Vout of the power module, so as to control the memory chip 3 to store the power data. The input end of the sampling circuit 1 is connected with the output end of the power supply module to monitor whether the output voltage of the power supply module is continuously reduced or not, and when the output voltage of the power supply module is lower than a first threshold value, a control signal is output, the output end of the sampling circuit 1 is connected with the main control chip 2, the main control chip 2 makes data analysis and judgment according to the control instruction, and the control instruction is provided for the storage chip.
And the storage chip 3 is used for executing the operation triggered by the control instruction of the main control chip 2, namely storing the electric energy data of the electric energy meter in time.
The power failure protection circuit of the embodiment detects whether the power supply module starts to power down or not through the sampling circuit in the detection module; after the sampling circuit detects that the power supply module starts to power down, the main control chip in the detection module outputs a control instruction to control the storage chip and trigger and store the electric energy data of the electric energy meter. The electric energy data in the power failure process can be stored in time when the system is powered down, the problems of storage device damage and data errors caused by electric energy data loss are avoided, and the operation reliability of the electric energy meter is improved.
Example 2
This embodiment provides another kind of power down protection circuit, fig. 2 is according to the utility model discloses a sampling circuit's structure chart, because power module's output voltage Vout is higher for the output voltage of first switch Q1, therefore, if the output voltage Vout that directly passes through power module drives first switch Q1, after can leading to voltage power module's output voltage Vout to reach very low value, first switch Q1 just can switch on, and then trigger the memory chip and preserve the electric energy data, but, power module's output voltage Vout will reduce to zero very fast at this time, because data preservation needs certain time, still not reach to accomplish a data preservation, the system will thoroughly fall the power down, therefore, in order to improve response speed, as shown in fig. 2, this sampling circuit includes: the first end of the first sampling unit 11 is connected to the output end of the power module, the second end is grounded, the output end is connected to the base b1 of the first switch Q1, and the first sampling unit 11 is configured to divide the output voltage Vout of the power module and output a first sampling voltage.
The emitter e1 of the first switch Q1 is connected to a voltage source Vcc, the collector c1 is connected to the first terminal of the second sampling unit 12, and the first switch Q1 is used for being turned on or off under the control of the first sampling voltage. The second end of the second sampling unit 12 is grounded, the output end is connected to the base b2 of the second switch Q2, and the second sampling unit 12 is configured to output a second sampling voltage when the first switch Q1 is turned on.
The collector c2 of the second switch Q2 is connected to a voltage source Vcc through a first resistor R1, the emitter e2 is grounded, a line between the collector c2 of the second switch Q2 and the first resistor R1 is connected to the main control chip 2, and the second switch Q2 is turned on under the control of the second sampling voltage, so that the sampling circuit 1 outputs a control command.
When the output voltage Vout of the power module is normal, the first sampling voltage is higher than the turn-on voltage of the first switch Q1, the first switch Q1 is not turned on, the second sampling voltage cannot be output, the second switch Q2 is not turned on, and then a high level signal is output between the collector c2 of the second switch Q2 and the first resistor R1, when the main control chip receives the high level signal, the main control chip does not trigger the memory chip to store the electric energy data, and the memory chip stores the electric energy data according to the internal normal control logic of the memory chip.
When the output voltage Vout of the power module is reduced to be below a certain threshold, the first sampling voltage is lower than the turn-on voltage of the first switch Q1, the first switch Q1 is turned on to generate a second sampling voltage, the second switch Q2 is driven to be turned on, and then the voltage between the collector c2 of the second switch Q2 and the first resistor R1 is pulled down, so that a low-level signal is output between the collector c2 of the second switch Q2 and the first resistor R1, and the main control chip triggers the memory chip to store the electric energy data when receiving the low-level signal.
Through the first sampling unit 11, the first switch Q1, the second sampling unit 12 and the second switch Q2, at the beginning of power failure of the system, at the initial stage when the value of the output voltage Vout of the power module begins to decrease, a corresponding control instruction is output to trigger the storage chip to store the electric energy data, so as to ensure that at least one time of data storage is completed.
In order to realize the voltage division, the first sampling unit 11 includes: the second resistor R2 and the third resistor R3 are arranged in series, the second resistor 2 is connected with the power supply module, the third resistor R3 is grounded, and a line between the second resistor R2 and the third resistor R3 is connected with the base b1 of the first switch Q1. The output voltage Vout of the power module is divided by the second resistor R2 and the third resistor R3, so as to improve the response speed of the first switch Q1 and the subsequent circuits.
The second sampling unit 12 includes: and the fourth resistor R4 and the fifth resistor R5 are arranged in series, the fourth resistor R4 is connected with the second end of the first switch Q1, the fifth resistor is grounded, and a line between the fourth resistor R4 and the fifth resistor R5 is connected with the base b2 of the second switch Q2 so as to output the second sampling voltage to the second switch Q2. Through the voltage division of the fourth resistor R4 and the fifth resistor R5, the input voltage of the base b2 of the second switch Q2 can be changed along with the conducting state of the first switch Q1.
In this embodiment, in order to turn off when the control terminal voltage is high and turn on when the control terminal voltage is low, the first switch Q1 is a PNP transistor. In order to turn off when the control terminal voltage is low and turn on when the control terminal voltage is high, the second switch Q2 is an NPN transistor.
In addition, the power down protection circuit further includes: and the first end of the capacitor C is connected with the output end of the power supply module, and the second end of the capacitor C is grounded and is used for filtering and stabilizing the voltage provided by the power supply module and then outputting the voltage.
Example 3
The embodiment provides a power-down protection circuit, as shown in fig. 1 mentioned above, which includes a sampling circuit 1, where the sampling circuit 1 includes a sampling circuit 1 and a main control chip 2, the sampling circuit 1 may be an AD sampling circuit, and the main control chip 2 may adopt an automatic ARM chip. The sampling circuit 1 is connected with a power supply module in a power supply system, and the power supply module can be a DC-DC chip or a switching power supply chip and peripheral circuits thereof.
The power failure protection circuit further comprises a memory chip 3, and the memory chip 3 can be an EEPROM memory chip. The power supply module is used for providing output voltage Vout for a circuit connected with the output end of a post-stage circuit, namely a DC-DC chip or a switching power supply chip working power supply, and supplying power to a load. While being connected to the input of the sampling circuit 1.
The sampling circuit 1 and the main control chip 2 are used for outputting a control instruction according to the change of the output voltage Vout of the power module so as to control the storage chip to store the electric energy data. The input end of the sampling circuit 1 is connected with the output end of the power supply module to detect whether the output voltage of the power supply module is continuously reduced or not, the output end of the sampling circuit 1 is connected with the main control chip 2, and the main control chip 2 analyzes and judges data according to the control instruction and provides the control instruction for the storage chip.
And the storage chip 3 is used for executing the operation triggered by the control instruction of the main control chip 2 and storing the electric energy data of the electric energy meter in time.
As shown in fig. 2 mentioned above, the power module outputs a 12V dc voltage, and outputs the output voltage Vout to the sampling circuit 1 after being regulated and filtered by the capacitor C, and determines whether data needs to be saved according to the value of the output voltage Vout.
Specifically, the first sampling unit 11 is formed by the second resistor R2 and the third resistor R3, wherein a ratio of the second resistor R2 to the third resistor R3 may be 2: 1, namely, the voltage output by the first sampling unit 11 is 1/3 of the output voltage of the power module, for example, when the power module outputs 12V dc voltage, the first sampling unit 11 outputs a 4V first sampling voltage to the base b1 of the first switch Q1. Since the first switch Q1 is a PNP type triode, when the voltage of the base b1 of the first switch Q1 is less than 2.6V, that is, less than the voltage (3.3V) of the voltage source Vcc minus the voltage (0.7V) between the emitter e1 and the base b1 of the first switch Q1, the first switch Q1 is turned on, the fourth resistor R4 and the fifth resistor R5 form the second sampling unit 12, the fourth resistor R4 and the fifth resistor R5 have equal resistances, the input end of the second sampling unit 12 is connected to the voltage source Vcc through the first switch Q1, the voltage of 3.3V is input, after passing through the first switch Q1, the voltage is reduced to 2.6V, and then the voltage is divided by the fourth resistor R4 and the fifth resistor R5, and 1.3V is output. Since the second switch Q2 is an NPN transistor, the second switch Q2 is turned on when the voltage at the base b2 of the second switch Q2 is 1.3V. The collector c2 of the second switch Q2 is connected to a voltage source Vcc through a first resistor R1, the first resistor R1 is a pull-up resistor, and after the second switch Q2 is turned on, the voltage between the first resistor R1 and the second switch Q2 is pulled down. When the main control chip 2 detects a low level, it indicates that the system starts to power down, and triggers the operation of storing the electric energy data. When the main control chip 2 detects a high level, it indicates that the system voltage is normal, and executes normal storage operation of the electric energy data. The first switch Q1 functions as an input/output voltage isolator, and the second switch Q2 functions as a switch.
Tests have found that it takes approximately 14ms to store the data once. In the process that the output voltage Vout drops from 7.8V (at this time, the voltage of the base b1 of the first switch Q1 is 2.6V) to 2.1V (at this time, the voltage of the base b1 of the first switch Q1 is 0.7V), 40ms is required, and at least the time for completing the two times of electric energy data storage can be satisfied.
Example 4
The embodiment provides an electric energy meter, which comprises the power failure protection circuit of the embodiment and is used for storing electric energy data in the power failure process in time when a power supply system is powered down so as to avoid data loss or damage.
Example 5
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the power fail safeguard method in the above-described embodiments.
The above-described circuit embodiments are only illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; 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 depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The utility model provides a power-fail safeguard circuit, is applied to the electric energy meter, its characterized in that, power-fail safeguard circuit includes:
the input end of the sampling circuit is connected with the output end of the power supply module and is used for monitoring the output voltage of the power supply module and outputting a control signal when the output voltage of the power supply module is lower than a first threshold value;
the input end of the main control chip is connected with the sampling circuit and is used for outputting a control instruction to the storage chip after the sampling circuit outputs a control signal;
and the input end of the storage chip is connected with the main control chip and is used for triggering and storing the electric energy data of the electric energy meter based on the control instruction.
2. The power down protection circuit of claim 1, wherein the sampling circuit comprises:
the first end of the first sampling unit is connected with the output end of the power supply module, the second end of the first sampling unit is grounded, the output end of the first sampling unit is connected with the control end of the first switch, and the first sampling unit is used for outputting a first sampling voltage;
the first end of the first switch is connected with a voltage source, and the second end of the first switch is connected with the first end of the second sampling unit and is used for being switched on or switched off under the control of the first sampling voltage;
the second end of the second sampling unit is grounded, the output end of the second sampling unit is connected with the control end of the second switch, and the second sampling unit is used for outputting a second sampling voltage when the first switch is conducted;
the first end of the second switch is connected with the voltage source through a first resistor, the second end of the second switch is grounded, the first end of the second switch is connected with a line between the first resistors and is connected with the main control chip, and the second switch is used for being switched on under the driving of the second sampling voltage to control the sampling circuit to output a control instruction.
3. The power down protection circuit of claim 2, wherein the first sampling unit comprises:
the second resistor and the third resistor are connected in series, the second resistor is connected with the power module, the third resistor is grounded, and a line between the second resistor and the third resistor is connected with the control end of the first switch.
4. The power down protection circuit of claim 2, wherein the second sampling unit comprises:
the fourth resistor is connected with the second end of the first switch, the fifth resistor is grounded, and a line between the fourth resistor and the fifth resistor is connected with the control end of the second switch.
5. The power down protection circuit of claim 2, wherein the first switch is a PNP transistor.
6. The power-down protection circuit of claim 2, wherein the second switch is an NPN transistor.
7. The power down protection circuit of claim 1, further comprising:
and the first end of the capacitor is connected with the output end of the power supply module, and the second end of the capacitor is grounded.
8. An electric energy meter, characterized by comprising the power down protection circuit of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022509938.XU CN213338644U (en) | 2020-11-02 | 2020-11-02 | Power-down protection circuit and electric energy meter |
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| CN202022509938.XU CN213338644U (en) | 2020-11-02 | 2020-11-02 | Power-down protection circuit and electric energy meter |
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