CN212161292U - Flash power-down protection circuit, controller and electric appliance device - Google Patents

Flash power-down protection circuit, controller and electric appliance device Download PDF

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Publication number
CN212161292U
CN212161292U CN202020570783.8U CN202020570783U CN212161292U CN 212161292 U CN212161292 U CN 212161292U CN 202020570783 U CN202020570783 U CN 202020570783U CN 212161292 U CN212161292 U CN 212161292U
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power
power supply
control unit
main control
flash
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不公告发明人
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Huizhou Topband Electronic Technology Co Ltd
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Huizhou Topband Electronic Technology Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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 is suitable for a circuit technology field provides a Flash power-fail safeguard circuit, controller and electrical apparatus, Flash power-fail safeguard circuit, including the main control unit, power supply switching unit and stand-by power supply unit, the main control unit is connected power supply switching unit, the inside power down detection module that is equipped with of main control unit, main power end is connected to the power down detection module, main power end and stand-by power supply unit are connected to the power switching unit, wherein, when the power down detection module detects main power end and falls the electricity, main control unit control power switching unit switches over the power supply to stand-by power supply unit from the main power end. The utility model discloses can make the voltage of power fail safeguard mode more stable, time length is controllable, even great data also can write in.

Description

Flash power-down protection circuit, controller and electric appliance device
Technical Field
The utility model belongs to the technical field of the circuit, especially, relate to a Flash power-down protection circuit, controller and electrical apparatus.
Background
At present, in the project development, the situation of unexpected power failure can occur when data is written into an internal Flash (or an external storage device) of a single chip microcomputer, and if protective measures are not taken in time, the data can be lost. The current common power failure protection mode is capacitor power supply, and has short power supply time, large voltage fluctuation and easy write failure.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a Flash power-down protection circuit aims at solving the power supply time of the power-down protection mode among the prior art short, the voltage fluctuation is great, writes into the problem of failure easily.
The embodiment of the utility model provides a Flash power-fail safeguard circuit, including main control unit, power switching unit and stand-by power supply unit, the main control unit is connected the power switching unit, the inside power failure detection module that is equipped with of main control unit, the main power end is connected to the power switching unit and stand-by power supply unit, wherein, works as the power failure detection module detects when the main power end falls the electricity, the main control unit control the power switching unit is followed the main power end switches into stand-by power supply unit supplies power.
Furthermore, the standby power supply unit comprises a standby power supply, a first diode, a first capacitor, a second diode and a second capacitor, wherein the cathode of the first diode is connected with the power supply switching unit, the anode of the first diode is respectively connected with the standby power supply and one end of the first capacitor, the other end of the first capacitor is connected with the grounding terminal, the cathode of the second diode is connected with the power supply switching unit, the anode of the second diode is respectively connected with the main power supply end and one end of the second capacitor, and the other end of the second capacitor is connected with the grounding terminal.
Further, the standby power supply is a button battery.
Furthermore, the power switching unit comprises a first triode and a second triode, the base of the first triode is connected with the main control unit, the collector of the first triode is connected with the main power supply end, the emitter of the first triode is connected with the main control unit, the base of the second triode is connected with the main control unit, the collector of the second triode is respectively connected with the cathode of the first diode and the cathode of the second diode, and the emitter of the second triode is connected with the main control unit.
Furthermore, the power down detection module is a digital-to-analog converter.
Furthermore, the Flash power-down protection circuit further comprises a reset unit, and the reset unit is connected with the main control unit.
Furthermore, the reset unit comprises a switch and a resistor, one end of the switch is connected with the grounding end, the other end of the switch is connected with one end of the resistor, and the other end of the resistor is connected with the main control unit.
Furthermore, an RTC clock module is disposed inside the main control unit.
The embodiment of the utility model provides a still provide a controller, the Flash power fail safe circuit that provides including above-mentioned embodiment.
The embodiment of the utility model provides an embodiment still provides an electrical apparatus, the Flash power fail safe circuit that provides including above-mentioned embodiment.
The utility model discloses the beneficial effect who reaches, the utility model discloses be equipped with main control unit, power switching unit and stand-by power supply unit, when the power down detection module in the main control unit detected the main power end and falls the electricity, main control unit control power switching unit switched into the power supply of stand-by power supply unit from the main power end. After the main control unit executes the Flash write-in operation, the power supply switching unit is controlled to close the standby power supply to stop supplying power, and at the moment, the power supply time of the standby power supply unit can change along with the time of the Flash write-in operation, so that the voltage of a power-down protection mode is stable, the time length is controllable, and even larger data can be written in.
Drawings
Fig. 1 is a schematic structural diagram of a Flash power-down protection circuit provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a main control unit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a standby power supply unit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a power switching unit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another Flash power-down protection circuit provided in this embodiment;
fig. 6 is a circuit diagram of a reset unit according to an embodiment of the present invention;
fig. 7 is a flowchart of a power failure detection method according to an embodiment of the present invention;
fig. 8 is a flowchart of a power switching method according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a controller according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electrical apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model discloses a through being equipped with power down detection module, power switching unit and stand-by power supply unit, when power down detection module detects that mains voltage is less than the early warning value, judge that the power has the trend of falling the power; and the software judges whether the main control unit is writing Flash, if so, the main control unit controls the standby power supply unit to supply power, and the main control unit controls the power off after judging that the Flash is written so as to save the electric quantity of the standby power supply unit. Therefore, whether the power supply is powered down or not is judged through the power failure detection module, and the power supply switching unit controls the switching of the power supply, so that the voltage of a power failure protection mode is stable, the time length is controllable, and even larger data can be written in.
Example one
As shown in fig. 1, fig. 1 is a schematic structural diagram of a Flash power-down protection circuit provided in an embodiment of the present invention; this Flash power fail safe circuit 100 includes main control unit 105, power supply switching unit 103 and stand-by power supply unit 102, main control unit 105 connects power supply switching unit 103, main control unit 105 is inside to be equipped with power down detection module 104, power down detection module 104 connects main power end (VCC)101, power supply switching unit 103 connects main power end (VCC)101 and stand-by power supply unit 102, wherein, when power down detection module 104 detects that main power end (VCC)101 falls the power, main control unit 105 control power switching unit 103 switches over to stand-by power supply unit 102 power supply from main power end (VCC) 101.
The main Control Unit 105 may be an MCU (Micro Control Unit, a Micro Control Unit, also called a Single Chip Microcomputer (MCU)) or a Single Chip Microcomputer (MCU).
The power down detection module 104 is a digital-to-analog converter, and is configured to detect whether the main circuit has a power down trend. A Digital-to-Analog Converter (ADC) may be referred to as an Analog-to-Digital Converter (ADC) or an Analog-to-Digital Converter (a/d Converter) and refers to a device that converts a continuous variable Analog signal into a discrete Digital signal. The device is an internal module belonging to the MCU. The device is arranged in the MCU, so that the cost can be reduced and the complexity of a circuit can be reduced.
In an embodiment of the present invention, referring to fig. 2, fig. 2 is a circuit diagram of a main control unit provided in an embodiment of the present invention. The MCU provides at least two paths of IO ports, a detection interface ADC _ INO, a power interface VDD and a ground terminal GND. The two paths of IO ports and the power interface VDD are both used for connecting the power switching unit 103. The detection interface ADC _ INO is connected to a main power supply terminal (VCC) 101. The two paths of IO ports are a first IO port C _ OUT _ IO _1 (P24 of MCU) and a second IO port C _ OUT _ IO _2 (P25 of MCU), respectively.
The master control unit 105 is further provided therein with a Real-Time Clock (RTC) module and an RTC Clock power supply corresponding to the RTC module. The RTC clock power supply is not connected with the inside of a power interface VDD in the MCU. Part of the single chip microcomputer is provided with an RTC module which is similar to the ADC module, but some RTC circuits are external chips (single units). In the embodiment, the main control unit 105 is provided with an RTC clock module inside, which is a timing device to provide accurate real-time or provide an accurate time reference for the electronic system. Of course, the master control unit 105 can also be externally connected to the RTC clock module, and at this time, the RTC clock power supply is also directly connected to the external clock circuit.
In an embodiment of the present invention, referring to fig. 3, fig. 3 is a circuit diagram of a standby power supply unit according to an embodiment of the present invention. The standby power supply unit 102 includes a standby power supply 106, a first diode D2, a first capacitor C40, a second diode D1 and a second capacitor C101, a cathode of the first diode D2 is connected to the power switching unit 103, an anode of the first diode D2 is connected to the standby power supply 106 and one end of the first capacitor C40, the other end of the first capacitor C40 is connected to a ground terminal GND, a cathode of the second diode D1 is connected to the power switching unit 103, an anode of the second diode D1 is connected to a main power supply terminal (VCC)101 and one end of the second capacitor C101, and the other end of the second capacitor C101 is connected to the ground terminal GND.
The standby power supply 106 is a button battery, and the button battery is arranged in the button battery holder CN 1. The main power supply terminal (VCC)101 provides 3.3V, and the button battery provides 3.0V. The first diode D2 and the second diode D1 may be of type 1N 4148. The capacitance values of the first capacitor C40 and the second capacitor C101 can be both 0.1 uF/16V.
Specifically, when the main POWER supply end (VCC)101 normally supplies POWER, the second diode D1D1 is conducted, the first diode D2D2 is not conducted due to pressure difference, the RTC clock POWER VBAT _ POWER is connected with the main POWER supply end VCC, the button cell does not supply POWER, and therefore the button cell can save POWER. When the main POWER supply end (VCC)101 is powered off (abnormal POWER supply), the second diode D1D1 is not conducted due to the pressure difference, the first diode D2D2 is conducted, and the RTC clock POWER VBAT _ POWER is connected with the button cell at the moment. Because the second diode D1D1 is non-conductive, the electricity of the button battery does not flow back to the main power supply terminal (VCC)101VCC, so that the button battery does not lack power, and the consumption of the button battery is reduced.
In an embodiment of the present invention, referring to fig. 4, fig. 4 is a circuit diagram of a power switching unit according to an embodiment of the present invention. The power switching unit 103 includes a first triode Q1 and a second triode Q2, the base of the first triode Q1 is connected with the main control unit 105, the collector of the first triode Q1 is connected with the main power supply terminal (VCC)101, the emitter of the first triode Q1 is connected with the main control unit 105, the base of the second triode Q2 is connected with the main control unit 105, the collector of the second triode Q2 is connected with the cathode of the first diode D2 and the cathode of the second diode D1, and the emitter of the second triode Q2 is connected with the main control unit 105.
The first transistor Q1 and the second transistor Q2 both function as switches and are used for controlling the access of a power supply, wherein the first transistor Q1 is used for accessing a power supply provided by a main power supply terminal (VCC)101, and the second transistor Q2 is used for accessing a power supply provided by a standby power supply 106. Of course, the first transistor Q1 and the second transistor Q2 may be replaced by other similar switching devices, such as MOS transistors.
Specifically, the base of the first transistor Q1 is connected to an IO port C _ OUT _ IO _1 of the MCU (P24 of the MCU), and the emitter of the first transistor Q1 is connected to a power interface VDD of the MCU. The base electrode of the second triode Q2 is connected with the IO port C _ OUT _ IO _2 (P25 of the MCU), and the emitter electrode of the second triode Q2 is connected with the power interface VDD of the MCU.
When the power failure detection module 104 detects a power failure of the main power supply terminal (VCC)101, the first transistor Q1 is not turned on, and the second transistor Q2 is turned on, and is connected to a power supply provided by the standby power supply 106 to continue working.
In an embodiment of the present invention, referring to fig. 5, fig. 5 is a schematic structural diagram of another Flash power down protection circuit provided by an embodiment of the present invention. The Flash power-down protection circuit 100 further comprises a reset unit 107, and the reset unit 107 is connected with the main control unit 105.
Further, referring to fig. 6, fig. 6 is a circuit diagram of a reset unit according to an embodiment of the present invention, the reset unit 107 includes a switch SW2 and a resistor R52, one end of the switch SW2 is connected to the ground GND, the other end of the switch SW2 is connected to one end of a resistor R52, and the other end of the resistor R52 is connected to the main control unit 105 (power source interface VDD).
The switch SW2 may be a key switch SW2, the switch SW2 may be of a type KAN3543-0351B-29, or of course, may be of another type of switch SW2 having the same function. Specifically, after Flash is written, or the main circuit is abnormal, or the MCU needs to be reset, the reset circuit can be turned on directly by pressing the switch SW2, so as to reset the MCU or the single chip microcomputer. The resistance of the resistor R52 may be 10K.
In this embodiment, refer to fig. 7, fig. 7 is a flowchart of a power failure detection method provided by an embodiment of the present invention, where the power failure detection method includes the steps of:
in step 201, an ADC module in the MCU detects the main power supply voltage in real time.
Step 202, judging whether the main voltage is lower than a preset alarm value.
And 203, if the voltage of the main power supply is lower than a preset alarm value, determining that the main power supply is powered off.
And 204, if the voltage of the main power supply is not lower than a preset alarm value, determining that the main power supply is normal (does not power down).
The preset alarm value can be preset and is used for judging the voltage value condition whether the main power supply is powered off or not. The main power supply is the normal working voltage of the main circuit.
Specifically, the power failure detection module detects the main power supply voltage in real time, and compares the detected main power supply voltage with a preset alarm value, so that whether the main power supply has power failure or not can be judged, and whether the main power supply has a power failure trend or not can be judged.
In this embodiment, referring to fig. 8, fig. 8 is a flowchart of a power switching method according to an embodiment of the present invention. After the main power supply is judged to have a power failure trend in fig. 7, the power supply switching unit can be controlled by the MCU to realize power supply switching, thereby ensuring normal operation of the main circuit. The power supply switching method comprises the following steps:
and step 301, judging whether the main power supply has a power failure trend.
Specifically, when the voltage of the main power supply is lower than a preset alarm value, the main power supply tends to be powered off, otherwise, the main power supply does not tend to be powered off.
And step 302, if the main power supply has a power failure trend, judging whether the MCU needs to execute the writing operation of the FLASH.
Specifically, in some project developments, data needs to be written into the MCU's internal FLASH (or external storage device). When the MCU is detected to receive the write-in operation instruction or the MCU is executing the write-in operation, the MCU can be judged to need to execute the write-in operation of the FLASH. Otherwise, judging that the MCU does not need the writing operation of the FLASH.
It should be noted that, executing the FLASH write operation is controlled by software, and the operation is initiated by software actively. The judgment of whether the FLASH is completely written is judged by software, and the operation commonly used by programmers is as follows: writing a flag bit (equal to 0 at this time) in the software, and when the program completes the writing operation of the FLASH, setting the flag bit (the flag bit is equal to 1 at this time), and judging the writing condition of the FLASH by judging the state of the flag bit.
It should be noted that, if the MCU needs to perform the FLASH write operation, the main power source is powered down, which may affect the result of writing the FLASH, for example, the power down of the main power source may cause the FLASH write failure.
Step 303, if the MCU needs to execute the writing operation of the FLASH, the MCU controls the power switching unit to switch the operation from the main power supply to the standby power supply.
Specifically, when it is determined that the MCU needs to perform the write operation of the FLASH, it indicates that the main power supply cannot operate normally, so that the main power supply needs to be switched to the standby power supply by controlling the first transistor and the second transistor in the power switching unit to be turned off.
Step 304, determine whether the FLASH write operation is completed.
Specifically, after the power supply is switched to the standby power supply for power supply, whether the FLASH write-in operation is completed or not can be detected in real time. When the MCU is detected not to execute the FLASH write-in operation any more, the completion of the FLASH write-in operation can be judged, otherwise, the incompletion of the FLASH write-in operation is judged.
In step 305, if the FLASH write operation is completed, the MCU controls the power switching unit to perform a shutdown operation, so that the standby power unit stops supplying power.
Specifically, after the FLASH write operation is completed, it is indicated that the standby power supply can be powered on without any further operation, that is, when the main power supply is powered off and the standby power supply does not work and has no other influence, the second triode in the power supply switching unit can be controlled to be turned off, and at this time, the first triode is also turned off. Therefore, when the MCU does not execute the FLASH writing operation, the electric quantity of the standby power supply can be saved.
And 306, if the main power supply does not have the power failure trend, the MCU controls the power supply switching module to control the power supply of the main power supply.
Specifically, of course, the main power supply may continue to be used to power the circuit when there is no tendency for the main power supply to power down. The standby power supply unit 102 does not need to be switched to supply power at this time.
In the embodiment of the present invention, the power failure detection module 104, the power switching unit 103 and the standby power unit 102 are provided. When a power failure detection module 104 in a main control unit 105 detects that the power supply voltage is lower than an early warning value, judging that the power supply has a power failure trend; the software then judges whether the main control unit 105 is writing Flash, if yes, the main control unit 105 controls the standby power supply unit 102 to supply power, and the main control unit 105 controls the power off after judging that Flash is written, so as to save the electric quantity of the standby power supply unit 102. Therefore, whether the power supply is powered down is judged by the power down detection module 104, and the power supply switching unit 103 controls the power supply to be switched to the standby power supply 106 for supplying power. When the data volume is large, the time for executing the FLASH write operation is relatively long, and the standby power supply 106 is turned off after the FLASH write operation is completed. And further, the voltage of the power-down protection mode is stable, the time length is controllable, and even larger data can be written.
Example two
Referring to fig. 9 in conjunction with fig. 1-8, fig. 9 is a schematic structural diagram of a controller according to an embodiment of the present invention, where the controller includes the Flash power down protection circuit 100 according to the above embodiment.
In the embodiment of the present invention, the Flash power down protection circuit 100 in the above embodiment is provided with a power down detection module 104, a power switching unit 103, and a standby power unit 102. When a power failure detection module 104 in a main control unit 105 detects that the power supply voltage is lower than an early warning value, judging that the power supply has a power failure trend; the software then judges whether the main control unit 105 is writing Flash, if yes, the main control unit 105 controls the standby power supply unit 102 to supply power, and the main control unit 105 controls the power off after judging that Flash is written, so as to save the electric quantity of the standby power supply unit 102. Therefore, whether the power supply is powered down is judged by the power down detection module 104, and the power supply switching unit 103 controls the power supply to be switched to the standby power supply 106 for supplying power. When the data volume is large, the time for executing the FLASH write operation is relatively long, and the standby power supply 106 is turned off after the FLASH write operation is completed. And further, the voltage of the power-down protection mode is stable, the time length is controllable, and even larger data can be written. Further, the voltage of the power-down protection mode of the controller is stable, the time length is controllable, and even larger data can be written.
EXAMPLE III
Referring to fig. 10 in conjunction with fig. 1-8, fig. 10 is a schematic structural diagram of an electrical apparatus provided in an embodiment of the present invention, and the electrical apparatus 109 includes the Flash power down protection circuit 100 provided in the above embodiment.
In the embodiment of the present invention, the Flash power down protection circuit 100 in the above embodiment is provided with a power down detection module 104, a power switching unit 103, and a standby power unit 102. When a power failure detection module 104 in a main control unit 105 detects that the power supply voltage is lower than an early warning value, judging that the power supply has a power failure trend; the software then judges whether the main control unit 105 is writing Flash, if yes, the main control unit 105 controls the standby power supply unit 102 to supply power, and the main control unit 105 controls the power off after judging that Flash is written, so as to save the electric quantity of the standby power supply unit 102. Therefore, whether the power supply is powered down is judged by the power down detection module 104, and the power supply switching unit 103 controls the power supply to be switched to the standby power supply 106 for supplying power. When the data volume is large, the time for executing the FLASH write operation is relatively long, and the standby power supply 106 is turned off after the FLASH write operation is completed. And further, the voltage of the power-down protection mode is stable, the time length is controllable, and even larger data can be written. Further, the voltage of the power-down protection mode of the electrical device is stable, the time length is controllable, and even larger data can be written.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The Flash power-down protection circuit is characterized by comprising a main control unit, a power supply switching unit and a standby power supply unit, wherein the main control unit is connected with the power supply switching unit, a power-down detection module is arranged in the main control unit and connected with a main power supply end, the power supply switching unit is connected with the main power supply end and the standby power supply unit, when the power-down detection module detects that the main power supply end is powered down, the main control unit controls the power supply switching unit to switch from the main power supply end to the standby power supply unit for power supply.
2. The Flash power-down protection circuit according to claim 1, wherein the standby power supply unit includes a standby power supply, a first diode, a first capacitor, a second diode, and a second capacitor, a cathode of the first diode is connected to the power switching unit, an anode of the first diode is connected to the standby power supply and one end of the first capacitor, respectively, another end of the first capacitor is connected to a ground terminal, a cathode of the second diode is connected to the power switching unit, an anode of the second diode is connected to the main power supply end and one end of the second capacitor, respectively, and another end of the second capacitor is connected to the ground terminal.
3. The Flash power-down protection circuit according to claim 1 or 2, wherein the backup power supply is a button cell.
4. The Flash power-down protection circuit according to claim 2, wherein the power switching unit includes a first transistor and a second transistor, a base of the first transistor is connected to the main control unit, a collector of the first transistor is connected to the main power source, an emitter of the first transistor is connected to the main control unit, a base of the second transistor is connected to the main control unit, a collector of the second transistor is connected to a negative electrode of the first diode and a negative electrode of the second diode, respectively, and an emitter of the second transistor is connected to the main control unit.
5. The Flash power-down protection circuit according to claim 4, wherein the power-down detection module is a digital-to-analog converter.
6. The Flash power-down protection circuit of claim 2, further comprising a reset unit, wherein the reset unit is connected to the main control unit.
7. The Flash power-down protection circuit according to claim 6, wherein the reset unit includes a switch and a resistor, one end of the switch is connected to the ground terminal, the other end of the switch is connected to one end of the resistor, and the other end of the resistor is connected to the main control unit.
8. The Flash power-fail protection circuit of claim 1, wherein an RTC clock module is disposed inside the main control unit.
9. A controller comprising the Flash power down protection circuit of any of claims 1-8.
10. An electrical device, characterized in that it comprises a Flash power down protection circuit according to any of claims 1 to 8.
CN202020570783.8U 2020-04-16 2020-04-16 Flash power-down protection circuit, controller and electric appliance device Active CN212161292U (en)

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CN202020570783.8U CN212161292U (en) 2020-04-16 2020-04-16 Flash power-down protection circuit, controller and electric appliance device

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Application Number Priority Date Filing Date Title
CN202020570783.8U CN212161292U (en) 2020-04-16 2020-04-16 Flash power-down protection circuit, controller and electric appliance device

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CN212161292U true CN212161292U (en) 2020-12-15

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