CN219779842U - Protection circuit applied to embedded equipment and embedded equipment - Google Patents
Protection circuit applied to embedded equipment and embedded equipment Download PDFInfo
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- CN219779842U CN219779842U CN202223601039.8U CN202223601039U CN219779842U CN 219779842 U CN219779842 U CN 219779842U CN 202223601039 U CN202223601039 U CN 202223601039U CN 219779842 U CN219779842 U CN 219779842U
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- 238000001514 detection method Methods 0.000 claims abstract description 47
- 238000004146 energy storage Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The utility model provides a protection circuit applied to embedded equipment and the embedded equipment, wherein the protection circuit applied to the embedded equipment comprises a main power supply loop, a standby power supply loop and a power failure detection circuit; the first end of the standby power supply loop is connected with the voltage input end of the main power supply loop, and the second end of the standby power supply loop is connected with the voltage output end of the main power supply loop; the first signal output end of the power failure detection circuit is connected with the third end of the standby power supply loop, and the second signal output end of the power failure detection circuit is connected with a detection pin of a central processing unit of the embedded equipment; the power-down detection circuit and the main power supply circuit share the same voltage input end, and the power-down detection circuit and the main power supply circuit share the same voltage output end. According to the utility model, after power failure, power can be supplied through the standby power supply loop, and the central processing unit in the embedded equipment is notified of power failure of main power, so that the central processing unit performs file backup, and file loss is avoided.
Description
Technical Field
The present utility model relates to the field of circuits, and in particular, to a protection circuit applied to an embedded device, and an embedded device.
Background
The embedded device is powered by a secondary power supply (12V or 24V) after mains supply conversion, and a main control chip of the embedded device runs a LINUX system or other operating systems. When the device normally operates, if the power supply is suddenly powered off, the internal files of the system are lost, but no means for ensuring that the internal files of the embedded device are not lost after the sudden power off exists at present.
Disclosure of Invention
The utility model provides a protection circuit applied to embedded equipment and the embedded equipment, and aims to solve the problem that internal files are lost after power supply of the embedded equipment is suddenly lost in the prior art.
The utility model provides a protection circuit applied to embedded equipment, which comprises: the device comprises a main power supply loop, a standby power supply loop and a power failure detection circuit; the first end of the standby power supply loop is connected with the voltage input end of the main power supply loop, and the second end of the standby power supply loop is connected with the voltage output end of the main power supply loop; the first signal output end of the power failure detection circuit is connected with the third end of the standby power supply loop, and the second signal output end of the power failure detection circuit is connected with a detection pin of a central processing unit of the embedded equipment; the power-down detection circuit and the main power supply circuit share the same voltage input end, and the power-down detection circuit and the main power supply circuit share the same voltage output end.
Optionally, the standby power supply loop comprises a charging circuit, an energy storage component and a boost conversion circuit; one end of the charging circuit is connected with the voltage input end, and the other end of the charging circuit is connected with the first common end; one end of the energy storage component is connected with the first public end, and the other end of the energy storage component is grounded; the first end of the boost conversion circuit is connected with the first common end, the second end of the boost conversion circuit is connected with the voltage output end, and the third end of the boost conversion circuit is connected with the first signal output end of the power failure detection circuit.
Optionally, the energy storage component comprises a capacitor.
Optionally, the standby power supply loop comprises an anti-reflection component; the anti-reverse component is connected in series between the voltage input end and the charging circuit, the positive electrode of the anti-reverse component is connected with the voltage input end, and the negative electrode of the anti-reverse component is connected with one end of the charging circuit.
Optionally, the anti-reflection component comprises an anti-reflection diode.
Optionally, the power down detection circuit includes: the first voltage division component, the second voltage division component, the first comparison component and the second comparison component; one end of the first voltage dividing component is connected with the voltage input end, and the other end of the first voltage dividing component is respectively connected with the non-inverting input ends of the first comparison component and the second comparison component; one end of the second voltage division component is connected with the voltage output end, and the other end of the second voltage division component is respectively connected with the negative phase input ends of the first comparison component and the second comparison component; the signal output end of the first comparison component is connected with the third end of the standby power supply loop, and the signal output end of the second comparison component is connected with the detection pin of the central processing unit.
Optionally, the first voltage dividing component comprises a first resistor and a second resistor; one end of the first resistor is connected with the voltage input end, and the other end of the first resistor is connected with the second common end; one end of the second resistor is grounded, and the other end of the second resistor is connected with the second common end, wherein the second common end is also used for connecting the non-inverting input ends of the first comparison component and the second comparison component.
Optionally, the second voltage division component comprises a third resistor and a fourth resistor; one end of the third resistor is connected with the voltage input end, and the other end of the third resistor is connected with a third common end; one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the third common end, wherein the third common end is also used for connecting the negative phase input ends of the first comparison component and the second comparison component.
Optionally, the first comparing component comprises a first comparator and the second comparing component comprises a second comparator.
The utility model also provides an embedded device, which comprises the protection circuit applied to the embedded device.
Compared with the prior art, the technical scheme provided by the embodiment of the utility model has the following advantages:
through the protection circuit applied to the embedded equipment, after the main power supply loop is powered down, the power failure detection circuit can provide a control signal for the standby power supply loop so that the standby power supply loop can be started to supply power after the power failure, and meanwhile, the power failure detection circuit can output a signal to the central processing unit so as to inform that the power failure occurs, so that the central processing unit can store data before the standby power supply loop is exhausted so as to backup data.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a protection circuit applied to an embedded device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a standby power supply circuit according to an embodiment of the present utility model;
FIG. 3 is a second schematic diagram of a standby power supply circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a power-down detection circuit according to an embodiment of the present utility model;
FIG. 5 is a second schematic diagram of a power-down detection circuit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a second embodiment of a protection circuit applied to an embedded device.
The device comprises a D1-diode, a B1-energy storage component, an R1-first resistor, an R2-second resistor, an R3-third resistor, an R4-fourth resistor, a U1-first comparator, a U2-second comparator and an EN-control signal.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model provides a protection circuit applied to embedded equipment, as shown in fig. 1, the protection circuit applied to the embedded equipment comprises: a main power supply circuit 100, a standby power supply circuit 101 and a power failure detection circuit 102; wherein, the first end of the standby power supply loop 101 is connected with the voltage input end VIN of the main power supply loop 100, and the second end of the standby power supply loop 101 is connected with the voltage output end VDD of the main power supply loop 100; the first signal output end of the power failure detection circuit 102 is connected with the third end of the standby power supply loop 101, and the second signal output end of the power failure detection circuit 102 is connected with a detection pin of the central processing unit;
it should be noted that, the power-down detection circuit 102 and the main power supply circuit 100 share the same voltage input end, and the power-down detection circuit 102 and the main power supply circuit 100 share the same voltage output end, so that the central processing unit can be notified that the power is not down during normal power supply, and can be notified that the power is down after the power is down, so that the central processing unit can store data.
That is, after the main power supply circuit 100 is powered down, the power-down detection circuit 102 provides a control signal to the backup power supply circuit 101 to enable the backup power supply circuit 101 to be started for power supply after power failure, and meanwhile, the power-down detection circuit 102 outputs a signal to the central processing unit to inform that power is lost, so that the central processing unit can store data before the power of the backup power supply circuit is exhausted to backup data.
It should be noted that, referring to fig. 1, the main power supply circuit 100 in the present utility model includes a step-down change circuit 10, where the step-down change circuit 10 is a circuit for converting a voltage at the voltage input terminal VIN into an output voltage which is lower than the input voltage and is adjusted to the voltage output terminal.
As shown in fig. 2, the standby power supply circuit 101 in the present utility model further includes a charging circuit 11, an energy storage component B1, and a boost converter circuit 12; one end of the charging circuit 11 is connected with the voltage input end VIN, and the other end of the charging circuit 11 is connected with the first common end; one end of the energy storage component B1 is connected with the first public end, and the other end of the energy storage component B1 is grounded; a first terminal of the boost converter circuit 12 is connected to the first common terminal, a second terminal of the boost converter circuit 12 is connected to the voltage output terminal VDD, and a third terminal of the boost converter circuit 12 is connected to the first signal output terminal of the power-down detection circuit.
In operation, the boost converter circuit 12 of the present utility model functions as a circuit that converts an input voltage into a regulated output voltage that is higher than the input voltage.
It can be seen that in the case of normal power supply, the charging circuit is used to charge the energy storage component B1, and the boost converter circuit 12 is not operated. It should be noted that, in the present utility model, the charging process is current-limited charging, that is, charging is stopped when the voltage value is smaller than a threshold value, and the threshold value may be set according to the requirement in a specific application scenario. In addition, at the time of power failure, after receiving the control signal of the power failure detection circuit 102, the power source device is used to convert the electric energy in the energy storage component B1 into the voltage of the voltage output terminal VDD to supply power.
In the embodiment of the present utility model, the energy storage component B1 may be a capacitor, or may be a super capacitor for storing electric energy according to need.
Further, as shown in fig. 3, the standby power supply circuit 101 of the present utility model may further include an anti-reflection component 13, where the anti-reflection component 13 is connected in series between the voltage input terminal VIN and the charging circuit, and a positive electrode of the anti-reflection component 13 is connected to the voltage input terminal VIN, and a negative electrode of the anti-reflection component 13 is connected to one end of the charging circuit. It should be noted that, the anti-reflection component 13 only allows the current to flow from the positive electrode to the negative electrode, so that the anti-reflection component 13 provided in the standby power supply circuit 101 can further play a role in protecting when power is lost. Based on this, the anti-reflection component 13 may include an anti-reflection diode D1 in a specific example.
As for the power-down detection circuit in the present utility model, as shown in fig. 4, the power-down detection circuit 102 includes: a first voltage dividing assembly 21, a second voltage dividing assembly 22, a first comparing assembly 23 and a second comparing assembly 24;
one end of the first voltage dividing component 21 is connected with the voltage input end VIN, and the other end of the first voltage dividing component 21 is respectively connected with the non-inverting input ends of the first comparing component 23 and the second comparing component 24; one end of the second voltage division component 22 is connected with the voltage output end VDD, and the other end of the second voltage division component 22 is respectively connected with the negative phase input ends of the first comparison component 23 and the second comparison component 24; the signal output end of the first comparison component 23 is connected with the third end of the standby power supply loop 101, and the signal output end of the second comparison component 24 is connected with the detection pin of the central processing unit.
In the utility model, during normal power supply, the first comparison component 23 in the power-down detection circuit 102 outputs a control signal to control the power supply circuit 101 to be not started and inform the central processing unit that power is not down; after the power is turned off, the first comparing component 23 in the power-off detecting circuit 102 outputs a control signal to control the power-on preparation power supply circuit 101 to start power standby, and at the same time, notifies the central processing unit of power-off for data backup.
Further, as shown in fig. 5, the first voltage dividing component 21 in the power-down detection loop 103 includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected with the voltage input end VIN, and the other end of the first resistor R1 is connected with the second common end; one end of the second resistor R2 is grounded, and the other end of the second resistor R2 is connected with a second common end, wherein the second common end is also used for connecting the non-inverting input ends of the first comparison component and the second comparison component.
Further, the second voltage dividing assembly 22 includes a third resistor R3 and a fourth resistor R4; one end of the third resistor R3 is connected with the voltage input end VIN, and the other end of the third resistor R3 is connected with the third common end; one end of the fourth resistor R4 is grounded, and the other end of the fourth resistor R4 is connected with a third common end, wherein the third common end is also used for connecting negative phase input ends of the first comparison component and the second comparison component.
As shown in fig. 6, the first comparing component 23 includes a first comparator U1, and the second comparing component 24 includes a second comparator U2. In this embodiment, the first comparator U1 and the second comparator U2 may be a comparator chip with model LM393, and in other embodiments, other types of comparators may be used.
The utility model will be explained below in its entirety with reference to the working principle of the utility model applied to a protection circuit of an embedded device, in particular:
when the voltage input VIN is powered, the main power supply loop 100 is configured to supply power to the embedded device, and the power supply voltage may be 5V (in other embodiments, the power supply voltage may be another value, which is only an example herein, and does not limit the power supply voltage in any way). After the voltage input terminal VIN is powered down, the main power supply loop 100 does not work, and at this time, power cannot be continuously supplied to the embedded device, if no standby power circuit is provided, the central processing unit of the embedded device will be powered down suddenly, which may result in data.
For the standby power supply loop 101, the circuit input takes power from the voltage input end VIN, the diode D1 may be an anti-reflection diode, and the storage component B1 for storing electric energy for the standby power supply loop may be a super capacitor; the charging circuit in the standby power supply loop is configured to charge the storage component B1, and specifically, after the charging circuit limits the current to a certain voltage value (for example, less than 5V, and can be adjusted according to the standby time) for charging the storage component B1, the charging is stopped. When the main power VIN is not powered down, the boost converter circuit 12 does not operate; after the main power is lost, the electric energy in the energy storage component B1 is converted into 5V voltage of the voltage output end VDD for power supply. The control signal (EN) for controlling whether the boost converter circuit 12 is operated or not is from the power-down detection circuit 102.
For the power failure detection circuit 102, the circuit is used for monitoring whether power failure occurs in real time, and the principle is that the voltage input end VIN is divided by the first resistor R1 and the second resistor R2, the voltage output end VDD is divided by the third resistor R3 and the fourth resistor R4, the divided value of the voltage input end VIN is larger than the divided value of the voltage output end VDD, the divided value of the voltage input end VIN is connected with the positive end of the comparator LM393, and the divided value of the voltage output end VDD is connected with the negative end of the comparator LM 393. When the voltage of the voltage input terminal VIN is normal, the first comparator U1 outputs a high level (control signal) to the boost converter circuit 12 to control the boost converter circuit 12 to be inactive; meanwhile, the second comparator U2 outputs a signal DET_OUT high level to the CPU detection pin to inform that power is not lost. After VIN is powered down, the first comparator U1 outputs a low level (control signal) to the boost converter circuit, so as to control the boost converter circuit 12 to start working, and ensure the power supply continuity of the voltage output terminal VDD; meanwhile, the second comparator U2 outputs a signal DET_OUT low level to the detection pin of the central processing unit to inform that the power is lost, so that the central processing unit immediately saves data and operates in a safe mode to wait for standby power to be exhausted.
Therefore, after the power is turned off, the protection circuit in the utility model can supply power through the standby power supply loop 101 and notify the central processing unit in the embedded equipment of the power failure of the main power, thereby triggering the central processing unit to backup the file and avoiding the loss of the file.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the utility model to enable those skilled in the art to understand or practice the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A protection circuit for an embedded device, comprising: the device comprises a main power supply loop, a standby power supply loop and a power failure detection circuit; the first end of the standby power supply loop is connected with the voltage input end of the main power supply loop, and the second end of the standby power supply loop is connected with the voltage output end of the main power supply loop; the first signal output end of the power failure detection circuit is connected with the third end of the standby power supply loop, and the second signal output end of the power failure detection circuit is connected with a detection pin of a central processing unit of the embedded equipment;
the power-down detection circuit and the main power supply circuit share the same voltage input end, and the power-down detection circuit and the main power supply circuit share the same voltage output end;
the standby power supply loop comprises a charging circuit, an energy storage component and a boost conversion circuit;
one end of the charging circuit is connected with the voltage input end, and the other end of the charging circuit is connected with the first common end; one end of the energy storage component is connected with the first public end, and the other end of the energy storage component is grounded; the first end of the boost conversion circuit is connected with the first common end, the second end of the boost conversion circuit is connected with the voltage output end, and the third end of the boost conversion circuit is connected with the first signal output end of the power failure detection circuit.
2. The protection circuit for an embedded device of claim 1, wherein the energy storage component comprises a capacitor.
3. The protection circuit for embedded appliances of claim 1, wherein the backup power loop comprises an anti-reflection component;
the anti-reflection component is connected in series between the voltage input end and the charging circuit, the positive electrode of the anti-reflection component is connected with the voltage input end, and the negative electrode of the anti-reflection component is connected with one end of the charging circuit.
4. A protection circuit for an embedded device as claimed in claim 3, wherein the anti-reflection component comprises an anti-reflection diode.
5. The protection circuit for an embedded device of claim 1, wherein the power down detection circuit comprises: the first voltage division component, the second voltage division component, the first comparison component and the second comparison component;
one end of the first voltage dividing component is connected with the voltage input end, and the other end of the first voltage dividing component is respectively connected with the non-inverting input ends of the first comparison component and the second comparison component; one end of the second voltage division component is connected with the voltage output end, and the other end of the second voltage division component is respectively connected with the negative phase input ends of the first comparison component and the second comparison component;
the signal output end of the first comparison component is connected with the third end of the standby power supply loop, and the signal output end of the second comparison component is connected with the detection pin of the central processing unit.
6. The protection circuit for an embedded device of claim 5, wherein the first voltage divider assembly comprises a first resistor and a second resistor;
one end of the first resistor is connected with the voltage input end, and the other end of the first resistor is connected with the second common end; one end of the second resistor is grounded, and the other end of the second resistor is connected with the second common end, wherein the second common end is also used for connecting the non-inverting input ends of the first comparison component and the second comparison component.
7. The protection circuit for an embedded device of claim 5, wherein the second voltage divider assembly comprises a third resistor and a fourth resistor;
one end of the third resistor is connected with the voltage input end, and the other end of the third resistor is connected with a third common end; one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the third common end, wherein the third common end is also used for connecting the negative phase input ends of the first comparison component and the second comparison component.
8. The protection circuit of claim 5, wherein the first comparison component comprises a first comparator and the second comparison component comprises a second comparator.
9. An embedded device comprising the protection circuit of any one of claims 1-8 applied to the embedded device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223601039.8U CN219779842U (en) | 2022-12-30 | 2022-12-30 | Protection circuit applied to embedded equipment and embedded equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223601039.8U CN219779842U (en) | 2022-12-30 | 2022-12-30 | Protection circuit applied to embedded equipment and embedded equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219779842U true CN219779842U (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223601039.8U Active CN219779842U (en) | 2022-12-30 | 2022-12-30 | Protection circuit applied to embedded equipment and embedded equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219779842U (en) |
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2022
- 2022-12-30 CN CN202223601039.8U patent/CN219779842U/en active Active
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