CN210347791U - Power failure detection circuit, cooking utensil control panel and cooking utensil - Google Patents
Power failure detection circuit, cooking utensil control panel and cooking utensil Download PDFInfo
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- CN210347791U CN210347791U CN201920345697.4U CN201920345697U CN210347791U CN 210347791 U CN210347791 U CN 210347791U CN 201920345697 U CN201920345697 U CN 201920345697U CN 210347791 U CN210347791 U CN 210347791U
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Abstract
The utility model relates to a household electrical appliances control field discloses a fall electric detection circuit, including voltage conversion module, switch module and microprocessor, voltage conversion module's power input end and switch module's trigger end connect first direct current voltage simultaneously, voltage conversion module's output connection switch module's power input end and to switch module output second direct current voltage, microprocessor's the end that resets is connected to switch module's output, microprocessor resets according to the reset signal of switch module output, because first direct current voltage is faster than second direct current voltage's the power-down rate, consequently adopt first direct current voltage trigger switch module output reset signal to make microprocessor can in time reset when falling the electricity, whole control system's stability has been guaranteed.
Description
Technical Field
The utility model relates to a household electrical appliances control technical field, concretely relates to fall electric detection circuitry, cooking utensil control panel and cooking utensil.
Background
In the singlechip control circuit, the operation of the singlechip needs to stabilize the power supply voltage, otherwise if the voltage is unstable, if the voltage is instantaneously powered down, the operation of an internal program is abnormal, or data is lost, and the whole control system can not work normally. Therefore, whether the power failure detection circuit can quickly detect the power failure state is important, the existing power failure detection circuit comprises a filter capacitor, and due to the charging and discharging effect of the filter capacitor, the hysteresis of the power failure detection exists, so that the single chip microcomputer control circuit cannot trigger the power failure state in time when the power failure detection is not in time, and the problem of abnormal operation of the whole program occurs.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a fall electric detection circuitry, cooking utensil control panel and cooking utensil, aim at solves current electric detection circuitry that falls and detects and can not in time detect down the electric state and lead to whole control system abnormal operation problem.
In order to achieve the above object, the present invention provides a power down detection circuit, which includes a voltage conversion module, a switch module and a microprocessor;
the power input end of the voltage conversion module and the trigger end of the switch module are connected with a first direct current voltage, the output end of the voltage conversion module is connected with the power input end of the switch module and outputs a second direct current voltage to the switch module, the output end of the switch module is connected with the reset end of the microprocessor, and the microprocessor resets according to the reset signal output by the switch module.
Optionally, the switch module comprises a first switch unit and a second switch unit;
the input end of the first switch unit is the trigger end of the switch module, the output end of the first switch unit is connected with the input end of the second switch unit, the output end of the second switch unit is the output end of the switch module, and the power input end of the second switch unit is the power input end of the switch module.
Optionally, the first switching unit includes a first resistor and an NPN transistor;
one end of the first resistor is an input end of the first switch unit, the other end of the first resistor is connected with a base electrode of the NPN triode, an emitting electrode of the NPN triode is grounded, and a collector electrode of the NPN triode is an output end of the first switch unit.
Optionally, the second switch unit includes a fourth resistor, a third resistor, and a PNP transistor;
one end of the fourth resistor is an input end of the second switch unit, the other end of the fourth resistor is connected with a base electrode of the PNP triode, an emitter electrode of the PNP triode is a power input end of the second switch unit, a collector electrode of the PNP triode and one end of the third resistor are connected to an output end of the second switch unit in a shared mode, and the other end of the third resistor is grounded.
Optionally, the switch module further includes a voltage-reducing unit, and the voltage-reducing unit is connected between the input terminal of the switch module and the input terminal of the first switch unit, so as to reduce the first dc voltage and output the reduced voltage to the input terminal of the first switch unit.
Optionally, the voltage dropping unit includes a first zener diode and a second zener diode;
the anode of the first voltage stabilizing diode is the output end of the voltage reduction unit, the cathode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode, and the cathode of the second voltage stabilizing diode is the input end of the voltage reduction unit.
Optionally, the voltage conversion module includes a voltage conversion unit and a filtering unit;
the output end of the voltage conversion unit is the input end of the voltage conversion module, the output end of the voltage conversion unit is the output end of the voltage conversion module, and the filtering unit is connected with the output end of the voltage conversion unit in parallel.
Optionally, the filtering unit includes a third capacitor and a fourth capacitor; the third capacitor and the fourth capacitor are connected in parallel.
In order to realize the above object, the utility model also provides a cooking utensil control panel, the cooking utensil control panel includes foretell fall electric detection circuit.
In order to achieve the above object, the present invention further provides a cooking appliance, which includes the above cooking appliance control panel.
Through the technical scheme, the utility model discloses a fall electric detection circuitry, including the voltage conversion module, switch module and microprocessor, voltage conversion module's power input end and switch module's trigger end connect first direct current voltage simultaneously, the output of voltage conversion module connects switch module's power input end and to switch module output second direct current voltage, microprocessor's the end that resets is connected to switch module's output, microprocessor resets according to the reset signal of switch module output, because first direct current voltage is faster than second direct current voltage's the power-down rate, consequently adopt first direct current voltage trigger switch module output reset signal to make microprocessor can in time reset when falling the electricity, whole control system's stability has been guaranteed.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic circuit diagram of the power down detection circuit of the present invention;
FIG. 2 is a schematic diagram of voltage waveforms of the first DC voltage and the second DC voltage of FIG. 1 when they are powered on;
fig. 3 is a schematic diagram of voltage waveforms of the first dc voltage and the second dc voltage of fig. 1 when power is off.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model discloses an at first provide a fall electric detection circuitry, as shown in fig. 1, this fall electric detection circuitry includes voltage transformation module 30, switch module 10 and microprocessor are MCU20, voltage transformation module 30's power input end and switch module 10's trigger end connect first direct current voltage simultaneously, voltage transformation module 30's output connection switch module 10's power input end and to switch module 10 output second direct current voltage, MCU 20's the end that resets is connected to switch module 10's output, MCU20 resets according to the reset signal of switch module 10 output.
Because the trigger terminal of the switch module 10 is connected to the power input terminal of the voltage conversion module 30 and is also connected to the trigger terminal of the switch module 10, and the output circuits inside the voltage conversion module 30 all include the filter circuit, when performing voltage conversion, the output voltage lags behind the voltage loaded by the power input terminal, and therefore when power failure occurs, the voltage at the power input terminal can trigger the switch module 10 in time, so that the switch module 10 outputs the reset signal to reset the MCU 20. If the output end of the switch module 10 outputs the trigger end of the second dc power supply connected to the switch module 10, the MCU20 may miss the reset timing before normal operation due to the hysteresis of its power-down detection, so that the program inside the MCU20 may run abnormally. Therefore, the power failure detection circuit can output a power failure signal in real time to trigger the MCU20 to reset in time, and the stability of the whole control system is ensured.
Specifically, the voltage conversion module 30 may be a voltage boosting circuit or a voltage dropping circuit, and in this embodiment, the voltage conversion module is a voltage dropping circuit, that is, the first dc power voltage VCC is greater than the second dc power voltage VDD. At this time, the second direct-current power supply reduced by the voltage change circuit supplies power to the MCU20 in addition to the power failure detection circuit, and certainly supplies power to other control units of the entire control system.
Because the voltage conversion module 30 is a voltage reduction module, the first dc power supply cannot be directly input into the switch module 10 to operate, and the switch module 10 can normally operate after the voltage is reduced.
Specifically, switch module 10 includes voltage reduction unit 13, first switch unit 11 and second switch unit 12, voltage reduction unit 13's input is switch module 10's trigger end, voltage reduction unit 13's output is connected first switch unit 11's input, second switch unit 12's input is connected to first switch unit 11's output, second switch unit 12's output is switch module 10's output, second switch unit 12's power input end is switch module 10's power input end.
Specifically, the first switching unit 11 includes a first resistor R1 and an NPN transistor Q1; one end of the first resistor R1 is an input end of the first switching unit 11, the other end of the first resistor R1 is connected to a base of the NPN transistor Q1, an emitter of the NPN transistor Q1 is grounded, and a collector of the NPN transistor Q1 is an output end of the first switching unit 11.
Specifically, the second switch unit 12 includes a fourth resistor R4, a third resistor R3, and a PNP transistor Q2, one end of the fourth resistor R4 is an input end of the second switch unit 12, the other end of the fourth resistor R4 is connected to a base of the PNP transistor Q2, an emitter of the PNP transistor Q2 is a power input end of the second switch unit 12, a collector of the PNP transistor Q2 and one end of the third resistor R3 are connected to an output end of the second switch unit 12, and the other end of the third resistor R3 is grounded.
Specifically, the voltage dropping unit 13 includes a first zener diode ZD1 and a second zener diode ZD 2; the anode of the first zener diode ZD1 is the output end of the voltage dropping unit 13, the cathode of the first zener diode ZD1 is connected to the anode of the second zener diode ZD2, and the cathode of the second zener diode ZD2 is the input end of the voltage dropping unit 13.
The operating principle of the above-described switch module 10 is as follows: when the high-voltage first direct-current power supply voltage such as 18V is reduced by the second voltage-stabilizing diode ZD2 and the first voltage-stabilizing diode ZD1 to become 5V, the 5V is input to the base electrode of the NPN triode Q1, the NPN triode Q1 and the PNP triode Q2 are both in a conducting state when the high-voltage first direct-current power supply voltage works normally, the PNP triode Q2 outputs a high level to a RESET pin of the MCU20, and the MCU20 keeps working normally; when the voltage drops due to power failure, the NPN transistor Q1 is turned off, and the PNP transistor Q2 is further turned off, and at this time, the PNP transistor Q2 outputs a low level to the RESET pin of the MCU20, triggering the MCU20 to perform an internal RESET operation.
It should be noted that, if the voltage conversion module 30 does not step down the voltage, but steps up the voltage, the switch module 10 may omit the step-down unit 13, and load the first dc power directly on the base of the NPN transistor Q1.
Specifically, the voltage conversion module 30 includes a voltage conversion unit 31 and a filtering unit 32; the output end of the voltage conversion unit 31 is the input end of the voltage reduction module, the output end of the voltage conversion unit 31 is the output end of the voltage reduction module, and the filtering unit 32 is connected in parallel with the output end of the voltage conversion unit 31.
Specifically, as shown in fig. 1, the voltage conversion unit 31 is a circuit formed by a voltage conversion chip IC1, a first power voltage VCC is applied to an input terminal of the voltage conversion chip IC1, the circuit is a small-sized switching power supply, and the voltage conversion chip includes an oscillating circuit and a switching circuit inside, so that only a simple original device connected to an external network is needed, a second dc power supply is output after an inductor L1 is connected to a SW terminal of the chip, and the second dc power supply is filtered by a third capacitor C3 and a fourth capacitor C4 of the filtering unit 32 and converted into a stable voltage to supply power to the switching module 10 and the MCU 20.
The waveform schematic diagrams of the first direct-current voltage VCC loaded by the voltage conversion module and the second direct-current voltage V DD output after conversion are respectively shown in fig. 2 and fig. 3 when the voltage conversion module is powered on and powered off, and can be seen from the diagrams, when the voltage conversion module is powered on and powered off, the first direct-current voltage VCC is faster than the second direct-current voltage VDD, so that after the trigger end of the switch module 10 is connected to the first direct-current voltage VCC, the voltage drop condition of the power down and the power up can be detected more quickly relative to the second direct-current voltage VDD supplied by the MCU, the MCU can be reset in time when the voltage drops, and the stability of the whole control system is improved.
The utility model also provides a cooking utensil control panel, this cooking utensil control panel includes foretell fall electric detection circuitry to this has realized that this cooking utensil control panel can in time reset work when the voltage falls, promotes its operational reliability and stability.
The utility model also provides a cooking utensil, this cooking utensil includes foretell cooking utensil control panel, and this cooking utensil specifically can be electric rice cooker, electric pressure cooker etc. through set up foretell at the cooking utensil control panel the utility model discloses a power down detection circuit for this cooking utensil can in time reset work when the voltage falls, avoids appearing inside micro-processing and makes whole cooking utensil normally work owing to unable normal the reseing, has promoted the job stabilization nature of cooking machine with this.
In the description herein, references to the description of the terms "first embodiment," "second embodiment," "example," etc., mean that a particular method, apparatus, or feature described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, methods, apparatuses, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A power failure detection circuit is characterized by comprising a voltage conversion module, a switch module and a microprocessor;
the power input end of the voltage conversion module and the trigger end of the switch module are connected with a first direct current voltage, the output end of the voltage conversion module is connected with the power input end of the switch module and outputs a second direct current voltage to the switch module, the output end of the switch module is connected with the reset end of the microprocessor, and the microprocessor resets according to the reset signal output by the switch module.
2. The power down detection circuit of claim 1, wherein the switching module comprises a first switching unit and a second switching unit;
the input end of the first switch unit is the trigger end of the switch module, the output end of the first switch unit is connected with the input end of the second switch unit, the output end of the second switch unit is the output end of the switch module, and the power input end of the second switch unit is the power input end of the switch module.
3. The power down detection circuit of claim 2, wherein the first switching unit comprises a first resistor and an NPN transistor;
one end of the first resistor is an input end of the first switching unit, the other end of the first resistor is connected with a base electrode of the NPN triode, an emitting electrode of the NPN triode is grounded, and a collector electrode of the NPN triode is an output end of the first switching unit.
4. The power down detection circuit of claim 2, wherein the second switching unit comprises a fourth resistor, a third resistor, and a PNP transistor;
one end of the fourth resistor is the input end of the second switch unit, the other end of the fourth resistor is connected with the base electrode of the PNP triode, the emitter electrode of the PNP triode is the power input end of the second switch unit, the collector electrode of the PNP triode and one end of the third resistor are connected to the output end of the second switch unit in a shared mode, and the other end of the third resistor is grounded.
5. The power down detection circuit of claim 2, wherein the switch module further comprises a voltage dropping unit, and the voltage dropping unit is connected between the input terminal of the switch module and the input terminal of the first switch unit to drop the first dc voltage and output the first dc voltage to the input terminal of the first switch unit.
6. The power down detection circuit of claim 5, wherein the voltage dropping unit includes a first zener diode and a second zener diode;
the anode of the first voltage stabilizing diode is the output end of the voltage reduction unit, the cathode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode, and the cathode of the second voltage stabilizing diode is the input end of the voltage reduction unit.
7. The power down detection circuit of claim 1, wherein the voltage translation module comprises a voltage conversion unit and a filtering unit;
the output end of the voltage conversion unit is the input end of the voltage conversion module, the output end of the voltage conversion unit is the output end of the voltage conversion module, and the filtering unit is connected with the output end of the voltage conversion unit in parallel.
8. The power down detection circuit of claim 7, wherein the filtering unit comprises a third capacitor and a fourth capacitor; the third capacitor and the fourth capacitor are connected in parallel.
9. A cooking appliance control board comprising the power-down detection circuit of any one of claims 1 to 8.
10. A cooking appliance comprising the cooking appliance control panel of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920345697.4U CN210347791U (en) | 2019-03-18 | 2019-03-18 | Power failure detection circuit, cooking utensil control panel and cooking utensil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920345697.4U CN210347791U (en) | 2019-03-18 | 2019-03-18 | Power failure detection circuit, cooking utensil control panel and cooking utensil |
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| Publication Number | Publication Date |
|---|---|
| CN210347791U true CN210347791U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920345697.4U Active CN210347791U (en) | 2019-03-18 | 2019-03-18 | Power failure detection circuit, cooking utensil control panel and cooking utensil |
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| CN (1) | CN210347791U (en) |
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