CN112290930A - Key detection circuit and household appliance - Google Patents
Key detection circuit and household appliance Download PDFInfo
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- CN112290930A CN112290930A CN202011138472.5A CN202011138472A CN112290930A CN 112290930 A CN112290930 A CN 112290930A CN 202011138472 A CN202011138472 A CN 202011138472A CN 112290930 A CN112290930 A CN 112290930A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00307—Modifications for increasing the reliability for protection in bipolar transistor circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/018—Coupling arrangements; Interface arrangements using bipolar transistors only
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Abstract
The invention provides a key detection circuit and a household appliance, wherein the circuit comprises a matrix type scanning display module, a key module and a detection signal output end, a row signal end of the matrix type scanning display module is respectively and electrically connected with a first end of a corresponding key in the key module, and a common end of the key module is electrically connected with the detection signal output end; the key detection circuit further comprises a signal conversion circuit and a main control chip power supply end, the public end of the key module is electrically connected with the detection signal output end through the signal conversion circuit, the main control chip power supply end supplies power to the signal conversion circuit, the signal conversion circuit acquires a key signal of the key module, and the signal conversion circuit outputs a key detection level to the detection signal output end according to the key signal. The household appliance applies the key detection circuit. The key detection circuit can be matched with the main control chips with different power supply voltages and different effective detection levels, and the key detection signal is more stable.
Description
Technical Field
The invention relates to the technical field of key detection, in particular to a key detection circuit and a household appliance using the key detection circuit.
Background
The key scheme of the touch key and the mechanical key are the mainstream key scheme, the detection principle of the two keys is different, the function purpose which can be realized is the same, but the mechanical key scheme is more economic and has higher cost performance.
The most widely applied mechanical keys are the touch keys, and although the detection principles of the touch keys are many, the core of the touch keys is only one: the key is pressed and released into on and off states respectively. The electrical appliances with keys including the dehumidifier are usually accompanied with indicator lamps or display windows, and the number of the keys is usually not less than four, under the condition, the keys and the display lamps can share a scanning signal port, so that the purposes of convenient application and cost reduction are achieved.
In an existing scheme, as shown in fig. 1, the key detection circuit includes a matrix scanning display module 1 and a key module 2, the key usually accompanies with an indicator light and a double eight display, in order to save the I/O port resource of the main control chip, the matrix scanning display module 1 adopts a matrix scanning to light, the matrix scanning display module 1 and the key module 2 share a terminal 11 to be connected with the main control chip, the key detects the scanning signal displayed in common, the detection of a plurality of keys is realized, and the resource is saved to the maximum extent. However, in this arrangement, the key detection depends on the circuit voltage of the scan display, and the key detection signal can be detected only after being matched with the main control chip, for example, the main control chip is usually supplied with power at 3.3V or 5V, and the ranges of the effective high and low levels detected by different chips are different, so that the reliability of the key detection is ensured for adapting to different chips, the key detection scheme of the same principle also needs to be customized for the chips, the difference is large, and the key detection scheme has a large risk of key failure in research and development, experiments, auditing and application, and the matching process involves material selection, which involves cost improvement.
Disclosure of Invention
The first objective of the present invention is to provide a key detection circuit, which can match different power supply voltages and different effective detection levels and has more stable key detection signals.
The second objective of the present invention is to provide a home appliance that can match different power supply voltages and different effective detection levels, and the key detection signal is more stable.
In order to achieve the first object, the key detection circuit provided by the invention comprises a matrix type scanning display module, key modules and a detection signal output end, wherein the row signal ends of the matrix type scanning display module are respectively electrically connected with the first ends of the corresponding keys in the key modules, and the common ends of the key modules are electrically connected with the detection signal output end; the key detection circuit further comprises a signal conversion circuit and a main control chip power supply end, the public end of the key module is electrically connected with the detection signal output end through the signal conversion circuit, the main control chip power supply end supplies power to the signal conversion circuit, the signal conversion circuit acquires a key signal of the key module, and the signal conversion circuit outputs a key detection level to the detection signal output end according to the key signal.
According to the scheme, the key detection circuit is provided with the signal conversion circuit between the public end of the key module and the detection signal output end, the signal conversion circuit outputs the key detection level to the main control chip according to the key signal, the key signal can be converted into the level which can be detected by the main control chip through the signal conversion circuit, the key detection signal is more stable, the possibility of missed detection and false detection caused by unstable signals is eliminated to the maximum extent, and the key detection circuit is matched with the main control chips with different power supply voltages and different effective detection levels.
In a further scheme, the signal conversion circuit comprises a switch tube, a control electrode of the switch tube is electrically connected with a public end of the key module, a first electrode of the switch tube is electrically connected with a power supply end of the main control chip, and a second electrode of the switch tube is grounded.
Therefore, the signal conversion circuit is provided with the switch tube, the first pole of the switch tube is electrically connected with the power end of the main control chip, the power supply of the signal conversion circuit is consistent with the power supply of the main control chip, the key detection level is guaranteed to be an effective level, and the effect of level conversion of key signals of the key module is achieved.
In a further scheme, the switch tube is a PNP type triode; the source electrode of PNP type triode is connected with the main control chip power end electricity, and the source electrode of PNP type triode is connected with the base electricity of PNP type triode through first resistance, and the base of PNP type triode passes through the second resistance and is connected with the public end electricity of button module, and the collecting electrode of PNP type triode is connected with the main control chip electricity, and the collecting electrode of PNP type triode passes through third resistance ground connection.
In a further scheme, the switching tube is an NPN type triode; the collector of the NPN type triode is electrically connected with the power supply end of the main control chip through a fourth resistor, the collector of the NPN type triode is electrically connected with the main control chip, the base of the NPN type triode is electrically connected with the public end of the key module through a fifth resistor, the source of the NPN type triode is electrically connected with the base of the NPN type triode through a sixth resistor, and the source of the NPN type triode is grounded.
Therefore, the type selection of the switch tube can be correspondingly set according to the conducting working polarities of the matrix type scanning display module and the key module, so that the signal conversion circuit is matched with a detection mechanism of the main control chip.
In order to achieve the second object, the household appliance provided by the invention is provided with a main control chip and a key detection circuit, wherein the key detection circuit comprises a matrix type scanning display module, a key module and a detection signal output end, a row signal end of the matrix type scanning display module is electrically connected with the main control chip, a column signal end of the matrix type scanning display module is respectively electrically connected with a first end of a corresponding key in the key module and is electrically connected with the main control chip, a common end of the key module is electrically connected with the detection signal output end, and the detection signal output end is electrically connected with the main control chip; the key detection circuit further comprises a signal conversion circuit and a main control chip power supply end, the public end of the key module is electrically connected with the detection signal output end through the signal conversion circuit, the main control chip power supply end supplies power to the signal conversion circuit, the signal conversion circuit acquires a key signal of the key module, and the signal conversion circuit outputs a key detection level to the detection signal output end according to the key signal.
Therefore, the key detection circuit is provided with the signal conversion circuit between the public end of the key module and the main control chip, the signal conversion circuit outputs the key detection level to the main control chip according to the key signal, the key signal can be converted into the level which can be detected by the main control chip through the signal conversion circuit, the key detection signal is more stable, the possibility of missed detection and false detection caused by unstable signals is eliminated to the maximum extent, and the key detection circuit is matched with the main control chips with different power supply voltages and different effective detection levels.
Drawings
Fig. 1 is a schematic circuit diagram of a conventional key detection circuit.
Fig. 2 is a block circuit diagram of a first embodiment of the household appliance of the present invention.
Fig. 3 is a schematic circuit diagram of a key detection circuit in a first embodiment of the household appliance of the present invention.
Fig. 4 is a schematic circuit diagram of a key detection circuit in a second embodiment of the household appliance of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
First embodiment of household appliance:
the household appliances of the present embodiment may be a dehumidifier, a refrigerator, an electric cooker, a washing machine, etc., and the dehumidifier will be described as an example.
As shown in fig. 2, in this embodiment, the dehumidifier is provided with a main control chip 3 and a key detection circuit 4, which are used to implement a key signal detection function.
Referring to fig. 3, the KEY detection circuit 4 includes a matrix scanning display module 5, a KEY module 6 and a detection signal output terminal KEY1, the row signal terminal 51 of the matrix scanning display module 5 is electrically connected to the main control chip 3, the row signal terminal 52 of the matrix scanning display module 5 is electrically connected to the first terminals of the corresponding KEYs in the KEY module 6 respectively and electrically connected to the main control chip 3, the second terminals of all the KEYs in the KEY module 6 are electrically connected to the common terminal of the KEY module 6, the common terminal of the KEY module 6 is electrically connected to the detection signal output terminal KEY1, and the detection signal output terminal KEY1 is electrically connected to the main control chip 3. The number of the row signal terminals 51 and the column signal terminals 52 can be set as required, and the number of the keys in the key module 6 is equal to the number of the column signal terminals 52.
The KEY detection circuit 4 further comprises a signal conversion circuit 7 and a main control chip power supply end 8, the public end of the KEY module 6 is electrically connected with the detection signal output end KEY1 through the signal conversion circuit 7, the main control chip power supply end 8 supplies power to the signal conversion circuit 7, the signal conversion circuit 7 acquires the KEY signal of the KEY module 6, and the signal conversion circuit 7 outputs the KEY detection level to the detection signal output end KEY1 according to the KEY signal. Under normal conditions, the high level of the key detection level is smaller than about 0.1V of the power voltage of the main control chip.
The signal conversion circuit 7 comprises a switch tube Q1, a control electrode of the switch tube Q1 is electrically connected with a public end of the key module 6, a first electrode of the switch tube Q1 is electrically connected with a power supply end 8 of the main control chip, and a second electrode of the switch tube Q1 is grounded. In this embodiment, switching tube Q1 is PNP type triode, and the source electrode of PNP type triode is connected with main control chip power end 8 electricity, and the source electrode of PNP type triode is connected with the base electricity of PNP type triode through first resistance R1, and the base of PNP type triode passes through second resistance R2 and is connected with the public end electricity of key module 6, and the collecting electrode of PNP type triode is connected with main control chip 3 electricity, and the collecting electrode of PNP type triode passes through third resistance R3 ground connection.
In this embodiment, when the key detection circuit 4 operates, the main control chip 3 first needs to be initialized: initializing and setting a display scanning signal, a display control signal, a key signal and a scanning period; then, the main control chip 3 gives out display scanning signals in turn according to the period, namely the first period only gives out the first display scanning signal, the second period only gives out the second display scanning signal, and so on, and all the display scanning signals are given out and completed, and the whole scanning process is circulated from the first display scanning signal; during each period of displaying the scanning signal, the main control chip 3 outputs a display control signal, lights up the indicator lamp, receives the key detection level, and judges whether the key corresponding to the current scanning signal is pressed down. The scanning period is not suitable to be too long, and the detection of all keys is completed once when all the display scanning signals are scanned once. The scanning step is well known to those skilled in the art and will not be described herein. The key signal sent by the key module 6 passes through the signal conversion circuit 7 to become the key detection level which can be detected by the main control chip, and the missing detection and the false detection caused by the key signal which is not in the effective detection range of the main control chip 3 and the unstable detection are eliminated.
Second embodiment of household appliance:
the household appliances of the present embodiment may be a dehumidifier, a refrigerator, an electric cooker, a washing machine, etc., and the dehumidifier will be described as an example.
The dehumidifier in this embodiment is different from the dehumidifier in the first embodiment of the home appliance only in the arrangement of the key detection circuit.
In this embodiment, the KEY detection circuit includes a matrix scanning display module 50, a KEY module 60 and a detection signal output terminal KEY2, a row signal terminal 501 of the matrix scanning display module 50 is electrically connected to the main control chip 3, a column signal terminal 502 of the matrix scanning display module 50 is electrically connected to a first terminal of a corresponding KEY in the KEY module 60 and electrically connected to the main control chip 3, second terminals of all KEYs in the KEY module 60 are electrically connected to a common terminal of the KEY module 60, the common terminal of the KEY module 60 is electrically connected to the detection signal output terminal KEY2, and the detection signal output terminal KEY2 is electrically connected to the main control chip 3. The number of the row signal terminals 501 and the number of the column signal terminals 502 can be set as required, and the number of the keys in the key module 60 is equal to the number of the column signal terminals 502.
The KEY detection circuit further comprises a signal conversion circuit 70 and a main control chip power supply end 80, the common end of the KEY module 60 is electrically connected with the detection signal output end KEY2 through the signal conversion circuit 70, the main control chip power supply end 80 supplies power to the signal conversion circuit 70, the signal conversion circuit 70 acquires a KEY signal of the KEY module 60, and the signal conversion circuit 70 outputs a KEY detection level to the detection signal output end KEY2 according to the KEY signal. Under normal conditions, the high level of the key detection level is smaller than about 0.1V of the power voltage of the main control chip.
The signal conversion circuit 70 comprises a switch tube Q2, a control electrode of the switch tube Q2 is electrically connected with a common terminal of the key module 60, a first electrode of the switch tube Q2 is electrically connected with a power supply terminal 80 of the main control chip, and a second electrode of the switch tube Q2 is grounded. In this embodiment, the switching tube Q2 is an NPN type triode, a collector of the NPN type triode is electrically connected to the power supply terminal 80 of the main control chip through the fourth resistor R4, the collector of the NPN type triode is electrically connected to the main control chip 3, a base of the NPN type triode is electrically connected to the common terminal of the key module 60 through the fifth resistor R5, a source of the NPN type triode is electrically connected to the base of the NPN type triode through the sixth resistor R6, and the source of the NPN type triode is grounded.
In this embodiment, the working principle of the key detection circuit is similar to that in the first embodiment of the household appliance, and is not described herein again.
Therefore, the key detection circuit is provided with the signal conversion circuit between the public end of the key module and the detection signal output end, the signal conversion circuit outputs the key detection level to the main control chip according to the key signal, the key signal can be converted into the level which can be detected by the main control chip through the signal conversion circuit, the key detection signal is more stable, the possibility of missed detection and false detection caused by unstable signals is eliminated to the maximum extent, and the key detection circuit is matched with the main control chips with different power supply voltages and different effective detection levels.
It should be noted that the above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept also fall within the protection scope of the present invention.
Claims (8)
1. A key detection circuit comprises a matrix type scanning display module, key modules and a detection signal output end, wherein the row signal ends of the matrix type scanning display module are respectively and electrically connected with the first ends of corresponding keys in the key modules, and the common ends of the key modules are electrically connected with the detection signal output end;
the method is characterized in that:
the key detection circuit further comprises a signal conversion circuit and a main control chip power supply end, the public end of the key module is electrically connected with the detection signal output end through the signal conversion circuit, the main control chip power supply end supplies power to the signal conversion circuit, the signal conversion circuit acquires the key signal of the key module, and the signal conversion circuit outputs the key detection level to the detection signal output end according to the key signal.
2. The key detection circuit of claim 1, wherein:
the signal conversion circuit comprises a switch tube, a control electrode of the switch tube is electrically connected with a public end of the key module, a first electrode of the switch tube is electrically connected with a power end of the main control chip, and a second electrode of the switch tube is grounded.
3. The key detection circuit of claim 2, wherein:
the switch tube is a PNP type triode;
the source electrode of PNP type triode with main control chip power end electricity is connected, the source electrode of PNP type triode pass through first resistance with the base electricity of PNP type triode is connected, the base of PNP type triode pass through the second resistance with the common terminal electricity of button module is connected, the collecting electrode of PNP type triode with the main control chip electricity is connected, the collecting electrode of PNP type triode passes through third resistance ground connection.
4. The key detection circuit of claim 2, wherein:
the switch tube is an NPN type triode;
the collector of the NPN type triode is electrically connected with the power supply end of the main control chip through a fourth resistor, the collector of the NPN type triode is electrically connected with the main control chip, the base of the NPN type triode is electrically connected with the public end of the key module through a fifth resistor, the source of the NPN type triode is electrically connected with the base of the NPN type triode through a sixth resistor, and the source of the NPN type triode is grounded.
5. A household appliance is provided with a main control chip and a key detection circuit, wherein the key detection circuit comprises a matrix type scanning display module, a key module and a detection signal output end, a row signal end of the matrix type scanning display module is electrically connected with the main control chip, a row signal end of the matrix type scanning display module is respectively electrically connected with a first end of a corresponding key in the key module and is electrically connected with the main control chip, a common end of the key module is electrically connected with the detection signal output end, and the detection signal output end is electrically connected with the main control chip; the method is characterized in that:
the key detection circuit further comprises a signal conversion circuit and a main control chip power supply end, the public end of the key module is electrically connected with the detection signal output end through the signal conversion circuit, the main control chip power supply end supplies power to the signal conversion circuit, the signal conversion circuit acquires the key signal of the key module, and the signal conversion circuit outputs the key detection level to the detection signal output end according to the key signal.
6. The household appliance according to claim 5, wherein:
the signal conversion circuit comprises a switch tube, a control electrode of the switch tube is electrically connected with a public end of the key module, a first electrode of the switch tube is electrically connected with a power end of the main control chip, and a second electrode of the switch tube is grounded.
7. The household appliance according to claim 6, wherein:
the switch tube is a PNP type triode;
the source electrode of PNP type triode with main control chip power end electricity is connected, the source electrode of PNP type triode pass through first resistance with the base electricity of PNP type triode is connected, the base of PNP type triode pass through the second resistance with the common terminal electricity of button module is connected, the collecting electrode of PNP type triode with the main control chip electricity is connected, the collecting electrode of PNP type triode passes through third resistance ground connection.
8. The household appliance according to claim 6, wherein:
the switch tube is an NPN type triode;
the collector of the NPN type triode is electrically connected with the power supply end of the main control chip through a fourth resistor, the collector of the NPN type triode is electrically connected with the main control chip, the base of the NPN type triode is electrically connected with the public end of the key module through a fifth resistor, the source of the NPN type triode is electrically connected with the base of the NPN type triode through a sixth resistor, and the source of the NPN type triode is grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011138472.5A CN112290930A (en) | 2020-10-22 | 2020-10-22 | Key detection circuit and household appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011138472.5A CN112290930A (en) | 2020-10-22 | 2020-10-22 | Key detection circuit and household appliance |
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| CN112290930A true CN112290930A (en) | 2021-01-29 |
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| CN202011138472.5A Pending CN112290930A (en) | 2020-10-22 | 2020-10-22 | Key detection circuit and household appliance |
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