CN109407577B - Wake-up circuit, wake-up method and electric cooker - Google Patents
Wake-up circuit, wake-up method and electric cooker Download PDFInfo
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- CN109407577B CN109407577B CN201811162795.0A CN201811162795A CN109407577B CN 109407577 B CN109407577 B CN 109407577B CN 201811162795 A CN201811162795 A CN 201811162795A CN 109407577 B CN109407577 B CN 109407577B
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
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- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
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Abstract
The invention discloses a wake-up circuit, a wake-up method and an electric cooker, wherein the wake-up circuit comprises a first single chip microcomputer, a second single chip microcomputer and a first power supply, a wake-up pin of the second single chip microcomputer is connected to communication pins of the first single chip microcomputer and the second single chip microcomputer, so that the first single chip microcomputer sends a wake-up signal to the second single chip microcomputer after being powered on, and the second single chip microcomputer is converted from a sleep mode to a working mode when receiving the wake-up signal; compared with the prior art, the invention reduces the connecting lines among the single-chip microcomputers, occupies less pin resources of the single-chip microcomputers, eliminates the defect that the traditional single-chip microcomputer needs to rely on power-on pulse for awakening and cannot be awakened if the power-on pulse is missed, avoids the problem that a zero-crossing signal circuit needs to be additionally added when the 220V power supply is adopted for awakening by adopting a zero-crossing signal, saves hardware resources by adopting the invention, and has wider applicability.
Description
Technical Field
The invention relates to an electronic control circuit, in particular to a wake-up circuit, a wake-up method and an electric cooker.
Background
In order to reduce the power consumption of the whole system, the single chip microcomputer is often required to be in a low power consumption mode. The method for waking up the single chip microcomputer at the present stage is an external interrupt wake-up, for example, the method described in patent CN102881084B, which is connected to an interrupt pin of the single chip microcomputer 1 in the sleep state through one pin of the single chip microcomputer 2. Thus, one pin resource of the singlechip 1 is consumed. If two singlechips need to be connected through external connection, the cost of external connection needs to be increased, and if multi-chip communication is needed, the cost is also increased. Meanwhile, the existing awakening method also has the following defects: 1. the traditional single chip microcomputer needs to be awakened by power-on pulses, and cannot be awakened if the power-on pulses are missed. 2. When the power supply is carried out at 220V, a zero-crossing signal circuit is additionally required for waking up by adopting a zero-crossing signal. 3. And part of the single chip microcomputer does not have a communication awakening function.
Therefore, how to design a method for waking up a single chip microcomputer from sleep, which can reduce external connection wires and occupy less pin resources of the single chip microcomputer, is a technical problem to be solved urgently in the industry.
Disclosure of Invention
In order to overcome the defect of occupying pin resources of a singlechip in the prior art, the invention provides a wake-up circuit, a wake-up method and an electric cooker using the wake-up circuit and the wake-up method.
The invention adopts the technical scheme that a wake-up circuit is designed, and the wake-up circuit comprises a first single chip microcomputer, a second single chip microcomputer and a first power supply, wherein a wake-up pin of the second single chip microcomputer is connected to communication pins of the first single chip microcomputer and the second single chip microcomputer, so that the first single chip microcomputer sends a wake-up signal to the second single chip microcomputer after being powered on, and the second single chip microcomputer is converted from a sleep mode to a working mode when receiving the wake-up signal.
The wake-up circuit further comprises a second power supply for supplying power to the second singlechip, and the voltage of the second power supply is smaller than that of the first power supply.
The first power supply is connected with the anode of the first diode D1, the second power supply is connected with the anode of the second diode D2, the cathodes of the first diode D1 and the second diode D2 are connected with a power supply common end, and the power supply common end supplies power to the second single chip microcomputer.
The communication pin of the first single chip microcomputer is connected with the public end through a first resistor R1, the communication pin of the second single chip microcomputer is connected with the public end through a third resistor R3, the awakening pin of the second single chip microcomputer is connected with the public end through a fourth resistor R4, and the public end is connected with the power supply public end through a second resistor R2.
In one embodiment, a common pin of the second single chip microcomputer is connected with a common terminal through a fifth resistor R5.
In another embodiment, the common terminal is connected to ground through a fifth resistor R5.
A wake-up method of the wake-up circuit comprises the steps that when a first single chip microcomputer is powered on, the first single chip microcomputer enters a working mode, and a wake-up signal is sent to a second single chip microcomputer; and when the second singlechip receives the awakening signal, the second singlechip enters a working mode from a sleep mode.
The single chip microcomputer queries whether the second single chip microcomputer is awakened, if not, the single chip microcomputer continues to send the awakening signal, and if the second single chip microcomputer is awakened, the single chip microcomputer stops sending the awakening signal; and when the second singlechip is switched from the sleep mode to the working mode, the first singlechip sends a wakened signal.
The wake-up method comprises the following operation steps
The single chip microcomputer comprises the following operation steps:
s10, normally operating the single chip microcomputer;
s11, detecting whether the singlechip II should be awakened under the external condition, if not, turning to S10, and if yes, turning to S12;
s12, sending a wake-up signal to a second singlechip;
s13, inquiring whether the second singlechip is awakened, if not, turning to S12, and if so, turning to S14;
s14, stopping the awakening operation, and turning to S10;
the second singlechip microcomputer comprises the following operation steps:
s20, the second singlechip enters a working mode;
s21, detecting whether the external condition should enter the sleep mode, if not, turning to the step S20, and if yes, turning to the step S22;
s22, the single chip microcomputer enters a sleep mode;
s23, detecting whether a wake-up signal is received, if the wake-up signal is not received, continuously waiting for the wake-up signal, and if the wake-up signal is received, switching to the step S24;
and S24, the second singlechip enters a working mode and sends a wake-up signal to the first singlechip, and the step is switched to S20.
The method for detecting whether the second singlechip should be awakened under the external condition in the step S11 includes: and detecting the power supply of the first singlechip, and if the power supply is initially electrified, waking up the second singlechip, and if the power supply is not initially electrified, not waking up the second singlechip.
The method for detecting whether the external condition should enter the sleep mode in step S21 includes: and detecting the power supply voltage of the second singlechip, if the power supply voltage is higher than a threshold value, not entering the sleep mode, and if the power supply voltage is lower than the threshold value, entering the sleep mode.
The invention also discloses an electric cooker which uses the wake-up circuit.
The invention also discloses an electric cooker, and the single chip microcomputer in the electric cooker adopts the awakening method.
Compared with the prior art, the invention reduces the connecting lines among the single-chip microcomputers, occupies less pin resources of the single-chip microcomputers, eliminates the defect that the traditional single-chip microcomputer needs to rely on power-on pulse for awakening and cannot be awakened if the power-on pulse is missed, avoids the problem that a zero-crossing signal circuit needs to be additionally added when the 220V power supply is adopted for awakening by adopting a zero-crossing signal, saves hardware resources by adopting the invention, and has wider applicability.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a circuit diagram of a power supply connected with two singlechips;
FIG. 2 is a schematic view of communication connection between two singlechips;
FIG. 3 is a schematic diagram of the communication connection between two SCMs in the preferred embodiment;
FIG. 4 is a schematic diagram of the communication connection between two singlechips in another embodiment;
FIG. 5 is a flow chart of a control method of the single chip microcomputer I;
FIG. 6 is a flow chart of a control method of the second singlechip.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention discloses a wake-up circuit, which refers to a circuit diagram of a power supply connected with two single chips shown in figure 1, wherein the first single chip is mainly used for controlling a high-power element (such as a heating element in an electric cooker), and the second single chip is mainly used for controlling a low-power element (such as a display element in the electric cooker). The first power supply is powered by alternating current, has the characteristics of strong energy and continuous stability, and supplies power to the first singlechip and the second singlechip by the first power supply during normal work. The second power supply is powered by a battery, has the characteristics of small energy and capability of being separated from commercial power, and when the first power supply stops supplying power, the first single chip microcomputer is powered off, and the second power supply only supplies power to the second single chip microcomputer; at this time, the second singlechip enters a sleep mode (also called a standby mode or a low power consumption mode) so as to save energy. The first power supply has a higher voltage than the second power supply.
Referring to a communication connection schematic diagram shown in fig. 2, the invention adopts the technical scheme that a wake-up circuit is designed, and the wake-up circuit comprises a first single chip microcomputer, a second single chip microcomputer and a first power supply, wherein a wake-up pin of the second single chip microcomputer is connected to communication pins of the first single chip microcomputer and the second single chip microcomputer, so that the first single chip microcomputer sends a wake-up signal to the second single chip microcomputer after being powered on, and the second single chip microcomputer is converted from a sleep mode to a working mode when receiving the. By the structure, connecting lines among the single-chip microcomputers can be reduced, and pin resources of the single-chip microcomputers are occupied less.
In a preferred embodiment, the wake-up circuit further comprises a second power supply for supplying power to the second singlechip, and the voltage of the second power supply is smaller than that of the first power supply. The first power supply is connected with the anode of the first diode D1, the second power supply is connected with the anode of the second diode D2, the cathodes of the first diode D1 and the second diode D2 are connected with a power supply common end, and the power supply common end supplies power to the second single chip microcomputer.
Referring to a communication connection schematic diagram of two singlechips shown in fig. 2, a communication pin of the first singlechip is connected to a common terminal through a first resistor R1, a communication pin of the second singlechip is connected to the common terminal through a third resistor R3, a wake-up pin of the second singlechip is connected to the common terminal through a fourth resistor R4, and the common terminal is connected to a power supply common terminal through a second resistor R2.
Referring to fig. 3, a communication connection diagram of two singlechips in a preferred embodiment is shown, and a common pin of the second singlechip is connected to a common terminal through a fifth resistor R5.
The working process of the invention is detailed below with reference to fig. 1 and 3: the voltage of the first power supply is larger than that of the second power supply, the first power supply supplies power under normal operation, the second power supply supplies power after the first power supply is powered off, and the second single chip microcomputer enters a sleep mode (low power consumption state) after the second single chip microcomputer detects that the power supply voltage is reduced. After the first power supply is powered up again, the single chip microcomputer starts to send a wake-up signal to the second single chip microcomputer. And after the second singlechip enters the sleep mode, the communication pin is set as an input port, the awakening pin is set as an input port, and the common pin outputs a low level. The 3 pins are connected together by resistors. After the first power supply is recovered, the communication pin of the first singlechip outputs a high level and then outputs a low level (namely the awakening signal), because the communication pin is connected with the awakening pin of the second singlechip, the level of the awakening pin is changed from the high level to the low level, and the second singlechip receives the signal to be awakened. And after the first singlechip sends the awakening signal, starting to detect whether the second singlechip responds, and if not, repeatedly sending the awakening signal at intervals until the awakened signal sent by the second singlechip is received. And in a normal operation mode, the second singlechip turns off the awakening function, and the level change of the communication pin cannot influence the second singlechip. Because the resistance value of the fifth resistor R5 connected with the common pin of the two singlechips is far smaller than that of the second resistor R2, the communication influence of the two singlechips of the level of the common pin is not large in the normal operation mode. But it is better that the normal pin is set to a high level in the normal operation mode. In fig. 2, R1 = R3 = R4, R2 is much larger than R1, and R5 is much larger than R2, wherein a group of examples is R1 = R3 = R4 = 470 ohm, R2 = 10K ohm, and R5= 120K ohm.
In another embodiment, the common terminal is connected to ground through a fifth resistor R5. Referring to fig. 4, as an alternative, instead of using the second common pin of the second mcu, the common terminal is grounded through a large resistor, and the wake-up pin can also be pulled low during the sleep period of the second mcu to wait for the wake-up signal. This scheme results in a slight reduction in the communication pin level, but does not affect communication.
Referring to fig. 2, in the schematic diagram of the communication connection between the two singlechips, there is no common pin or no resistor grounding, and the wake-up pin and the communication pin are at high level in the sleep mode, in this scheme, the wake-up signal should be changed to be active at low level.
The invention also discloses a wake-up method of the wake-up circuit, which comprises the steps of entering a working mode after the singlechip I is powered on and sending a wake-up signal to the singlechip II; and when the second singlechip receives the awakening signal, the second singlechip enters a working mode from a sleep mode.
The single chip microcomputer queries whether the second single chip microcomputer is awakened, if not, the single chip microcomputer continues to send the awakening signal, and if the second single chip microcomputer is awakened, the single chip microcomputer stops sending the awakening signal; and when the second singlechip is switched from the sleep mode to the working mode, the first singlechip sends a wakened signal.
Referring to fig. 5, in the preferred embodiment, the first single chip microcomputer comprises the following operation steps:
s10, normally operating the single chip microcomputer;
s11, detecting whether the singlechip II should be awakened under the external condition, if not, turning to S10, and if yes, turning to S12;
s12, sending a wake-up signal to a second singlechip;
s13, inquiring whether the second singlechip is awakened, if not, switching to S12 (continuously sending an awakening signal), and if so, switching to S14;
s14, stopping the awakening operation, and turning to S10;
referring to fig. 6, in the preferred embodiment, the second single chip microcomputer includes the following operation steps:
s20, the second singlechip enters a working mode;
s21, detecting whether the external condition should enter the sleep mode, if not, turning to the step S20, and if yes, turning to the step S22;
s22, the single chip microcomputer enters a sleep mode;
s23, detecting whether a wake-up signal is received, if the wake-up signal is not received, continuously waiting for the wake-up signal, and if the wake-up signal is received, switching to the step S24;
and S24, the second singlechip enters a working mode and sends a wake-up signal to the first singlechip, and the step is switched to S20 (the singlechip normally runs).
In a preferred embodiment, the method for detecting whether the second mcu should be awakened by the external condition in step S11 includes: and detecting the power supply of the first singlechip, and if the power supply is initially electrified, waking up the second singlechip, and if the power supply is not initially electrified, not waking up the second singlechip.
In a preferred embodiment, the method for detecting whether the external condition should enter the sleep mode in step S21 includes: and detecting the power supply voltage of the second singlechip, if the power supply voltage is higher than a threshold value, not entering the sleep mode, and if the power supply voltage is lower than the threshold value, entering the sleep mode. Referring to the circuit diagram of the power supply connected with the two singlechips shown in fig. 1, the voltage of the first power supply is higher than that of the second power supply, and the threshold value is between the first power supply and the second power supply. The voltage connected with the second singlechip is higher than a threshold value, which represents that the first power supply supplies power; and when the voltage is lower than the threshold value, the second power supply supplies power.
The invention also discloses an electric cooker which uses the wake-up circuit. The first single chip microcomputer is mainly used for controlling the heating element, and the second single chip microcomputer is mainly used for controlling the display element.
The invention also discloses an electric cooker, and the single chip microcomputer in the electric cooker adopts the awakening method.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (12)
1. A wake-up circuit comprises a first single chip microcomputer, a second single chip microcomputer and a first power supply, and is characterized in that a wake-up pin of the second single chip microcomputer is connected to communication pins of the first single chip microcomputer and the second single chip microcomputer, so that the first single chip microcomputer sends a wake-up signal to the second single chip microcomputer after being powered on, and the second single chip microcomputer is converted from a sleep mode to a working mode when receiving the wake-up signal;
the power supply II supplies power to the singlechip II, and the voltage of the power supply II is smaller than that of the power supply I;
if the power supply voltage of the second single chip microcomputer is higher than the threshold value, the second single chip microcomputer does not enter the sleep mode, if the power supply voltage of the second single chip microcomputer is lower than the threshold value, the second single chip microcomputer enters the sleep mode, and the threshold value is between the first power supply and the second power supply.
2. The wake-up circuit of claim 1, wherein the first power supply is connected to an anode of a first diode D1, the second power supply is connected to an anode of a second diode D2, and cathodes of the first diode D1 and the second diode D2 are connected to a power supply common terminal, which supplies power to the second single chip microcomputer.
3. The wake-up circuit of claim 2, wherein the communication pin of the first chip microcomputer is connected to the common terminal through a first resistor R1, the communication pin of the second chip microcomputer is connected to the common terminal through a third resistor R3, the wake-up pin of the second chip microcomputer is connected to the common terminal through a fourth resistor R4, and the common terminal is connected to the power supply common terminal through a second resistor R2.
4. The wake-up circuit of claim 3, wherein a common pin of the second singlechip is connected to the common terminal through a fifth resistor R5.
5. A wake-up circuit as claimed in claim 3, wherein the common terminal is connected to ground through a fifth resistor R5.
6. A wake-up method using the wake-up circuit of any one of claims 1 to 5, characterized in that, after the first single chip computer is powered on, the first single chip computer enters a working mode and sends a wake-up signal to the second single chip computer; and when the second singlechip receives the awakening signal, the second singlechip enters a working mode from a sleep mode.
7. The wake-up method according to claim 6, wherein the single chip microcomputer queries whether the second single chip microcomputer has been awakened, continues to send the wake-up signal if not, and stops sending the wake-up signal if the second single chip microcomputer has been awakened; and when the second singlechip is switched from the sleep mode to the working mode, the first singlechip sends a wakened signal.
8. The wake-up method according to claim 7, comprising:
the single chip microcomputer comprises the following operation steps:
s10, normally operating the single chip microcomputer;
s11, detecting whether the singlechip II should be awakened under the external condition, if not, turning to S10, and if yes, turning to S12;
s12, sending a wake-up signal to a second singlechip;
s13, inquiring whether the second singlechip is awakened, if not, turning to S12, and if so, turning to S14;
s14, stopping the awakening operation, and turning to S10;
the second singlechip microcomputer comprises the following operation steps:
s20, the second singlechip enters a working mode;
s21, detecting whether the external condition should enter the sleep mode, if not, turning to the step S20, and if yes, turning to the step S22;
s22, the single chip microcomputer enters a sleep mode;
s23, detecting whether a wake-up signal is received, if the wake-up signal is not received, continuously waiting for the wake-up signal, and if the wake-up signal is received, switching to the step S24;
and S24, the second singlechip enters a working mode and sends a wake-up signal to the first singlechip, and the step is switched to S20.
9. The wake-up method according to claim 8, wherein the method for detecting whether the second mcu should be woken up by the external condition in step S11 comprises: and detecting the power supply of the first singlechip, and if the power supply is initially electrified, waking up the second singlechip, and if the power supply is not initially electrified, not waking up the second singlechip.
10. A wake-up method according to claim 8, wherein the method of detecting whether an external condition should enter the sleep mode in step S21 comprises: and detecting the power supply voltage of the second singlechip, if the power supply voltage is higher than a threshold value, not entering the sleep mode, and if the power supply voltage is lower than the threshold value, entering the sleep mode.
11. An electric rice cooker, characterized in that the electric rice cooker uses the wake-up circuit of any one of claims 1 to 5.
12. An electric rice cooker characterized in that it employs the waking method of any one of claims 6 to 10.
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| CN201811162795.0A CN109407577B (en) | 2018-09-30 | 2018-09-30 | Wake-up circuit, wake-up method and electric cooker |
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| DE60322445D1 (en) * | 2002-05-27 | 2008-09-04 | Fujitsu Ltd | A / D converter bias current circuit |
| CN101013859B (en) * | 2006-02-05 | 2011-12-14 | 王海 | Switching power supply with function of micropower standby |
| CN101242447B (en) * | 2008-03-12 | 2010-07-14 | 上海闻泰电子科技有限公司 | A dual-CPU architecture smart phone and its communication control method |
| CN101625588B (en) * | 2008-07-08 | 2011-03-23 | 鸿富锦精密工业（深圳）有限公司 | Supply circuit of PWM controller |
| CN101980472B (en) * | 2010-10-28 | 2012-12-26 | 南京大学 | Remote constant-voltage feeding method and system with awakening function |
| US9490651B2 (en) * | 2013-03-15 | 2016-11-08 | Flextronics Ap, Llc | Sweep frequency mode for magnetic resonant power transmission |
| CN203193512U (en) * | 2013-03-21 | 2013-09-11 | 南京微盟电子有限公司 | A control circuit of an ultra-low standby power supply |
| TWI613546B (en) * | 2013-03-28 | 2018-02-01 | 威盛電子股份有限公司 | Universal serial bus hub and control method thereof |
| US20150095537A1 (en) * | 2013-10-02 | 2015-04-02 | Qualcomm Incorporated | Camera control interface sleep and wake up signaling |
| CN204926025U (en) * | 2015-09-23 | 2015-12-30 | 吴忧 | Touch awakens formula non -transformer drive wireless mouse up based on thermoelectric generation principle |
| CN106026222A (en) * | 2016-05-16 | 2016-10-12 | 深圳市乐祺微电子科技有限公司 | Power battery management control integrated circuit |
| CN106489109A (en) * | 2016-09-21 | 2017-03-08 | 深圳市汇顶科技股份有限公司 | A kind of SCM system and the repositioning method for SCM system |
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