CN214380863U - Multifunctional display key circuit - Google Patents
Multifunctional display key circuit Download PDFInfo
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- CN214380863U CN214380863U CN202023057092.7U CN202023057092U CN214380863U CN 214380863 U CN214380863 U CN 214380863U CN 202023057092 U CN202023057092 U CN 202023057092U CN 214380863 U CN214380863 U CN 214380863U
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a multifunctional display key circuit, which comprises a LED display circuit, a key detection circuit, a first switch circuit, a second switch circuit, a third switch circuit, a voltage detection circuit, a power supply circuit and an MCU; one end of the LED display circuit is respectively connected with the MCU, the key detection circuit and the first switch circuit, and the other end of the LED display circuit is connected with the MCU through the first switch circuit; one end of the key detection circuit is connected with the LED display circuit and the MCU respectively, and the other end of the key detection circuit is connected with the first switch circuit and the MCU respectively. Adopt the utility model discloses, can take place under the condition of short circuit at LED, the button is used and is not influenced, avoids MCU and LED to be punctured simultaneously, plays the effect of protection components and parts.
Description
Technical Field
The utility model relates to a circuit field especially relates to a multi-functional display keying circuit.
Background
In order to save the use of ports of a control chip, the existing household appliances often multiplex the ports of the control chip, such as: the LED display circuit and the key circuit are multiplexed, namely the display circuit and the key detection circuit are connected in parallel, so that multiplexing of ports is realized. However, when the LED is broken down and short-circuited, the control chip cannot detect the key signal, so that the key malfunction is caused, and the use is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a multifunctional display keying circuit is provided, can take place under the condition of short circuit at LED, the button is used and is not influenced.
In order to solve the technical problem, the utility model provides a multifunctional display key circuit, which comprises a LED display circuit, a key detection circuit, a first switch circuit, a second switch circuit, a third switch circuit, a voltage detection circuit, a power supply circuit and an MCU; one end of the LED display circuit is respectively connected with the MCU, the key detection circuit and the first switch circuit, and the other end of the LED display circuit is connected with the MCU through the first switch circuit; one end of the key detection circuit is respectively connected with the LED display circuit and the MCU, and the other end of the key detection circuit is respectively connected with the first switch circuit and the MCU; the power supply circuit supplies power to the MCU through the second switch circuit, and is also connected with the second switch circuit through a third switch circuit, and the third switch circuit is used for controlling the switch of the second switch circuit; the MCU is connected with the power supply circuit through the voltage detection circuit and is also connected with the third switch circuit and controls the switch of the third switch circuit.
Preferably, the first switch circuit includes a first MOS transistor and a first resistor, and the first MOS transistor is an N-channel MOS transistor; the grid electrode of the first MOS tube is connected with one end of the LED display circuit through the first resistor, the source electrode of the first MOS tube is connected with the other end of the LED display circuit, and the drain electrode of the first MOS tube is respectively connected with the key detection circuit and the MCU.
Preferably, the key detection circuit comprises a key switch and a first diode, one end of the key switch is respectively connected with the LED display circuit and the MCU, and the other end of the key switch is respectively connected with the drain of the first MOS transistor and the MCU.
Preferably, the second switch circuit is a relay, and the relay includes a first coil contact, a second coil contact, a normally closed contact, and a moving contact; the first coil contact is connected with the power supply circuit through the third switch circuit, the second coil contact is grounded, the normally closed contact is connected with the power supply circuit, and the movable contact is connected with the MCU.
Preferably, the third switching circuit includes a first triode and a second resistor, and the first triode is an NPN-type triode; the base electrode of the first triode is connected with the MCU through the second resistor, the collector electrode of the first triode is connected with the power supply circuit, and the emitter electrode of the first triode is connected with the first coil contact.
Preferably, the voltage detection circuit includes a third resistor and a fourth resistor; one end of the third resistor is connected with the power supply circuit, the other end of the third resistor is grounded through the fourth resistor, and the other end of the third resistor is also connected with the MCU.
Preferably, the power supply circuit comprises an adapter interface circuit, the adapter interface circuit comprises an adapter socket, a first capacitor and a second capacitor, and the first capacitor and the second capacitor are both connected in parallel at two ends of the adapter socket; one end of the adapter socket is connected with the second switch circuit, the voltage detection circuit and the third switch circuit respectively, and the other end of the adapter socket is grounded.
Preferably, the power supply circuit further comprises a battery interface circuit, the battery interface circuit comprising a battery receptacle and a second diode; one end of the battery socket is connected with the adapter socket through the second diode, and the other end of the battery socket is grounded.
Implement the utility model has the advantages that:
the utility model comprises a LED display circuit, a key detection circuit, a first switch circuit, a second switch circuit, a third switch circuit, a voltage detection circuit, a power supply circuit and an MCU; one end of the LED display circuit is respectively connected with the MCU, the key detection circuit and the first switch circuit, and the other end of the LED display circuit is connected with the MCU through the first switch circuit; one end of the key detection circuit is connected with the LED display circuit and the MCU respectively, and the other end of the key detection circuit is connected with the first switch circuit and the MCU respectively. The utility model discloses, through first switch circuit, can break off LED display circuit when LED display circuit short circuit trouble takes place, make the keying circuit not influenced by the short circuit of LED display circuit, still can detect the key signal through MCU; in addition, the output voltage of the power supply circuit is measured through the voltage detection circuit, and when the output voltage exceeds a preset threshold value, the MCU and the power supply circuit are disconnected through the second switch circuit and the third switch circuit, so that the MCU and the LED are prevented from being broken down, and the probability of short circuit of the LED is reduced.
Drawings
Fig. 1 is a schematic block diagram of a multifunctional display key circuit provided by the present invention;
fig. 2 is a circuit diagram of a first switch circuit and a key detection circuit provided by the present invention;
fig. 3 is a circuit diagram of a second switch circuit, a third switch circuit and a voltage detection circuit provided by the present invention;
fig. 4 is a circuit diagram of a power supply circuit provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.
As shown in fig. 1, the utility model provides a multifunctional display key circuit, which comprises a LED display circuit 1, a key detection circuit 2, a first switch circuit 3, a second switch circuit 4, a third switch circuit 5, a voltage detection circuit 6, a power supply circuit 7 and a MCU 8; one end of the LED display circuit 1 is respectively connected with the MCU8, the key detection circuit 2 and the first switch circuit 3, and the other end is connected with the MCU8 through the first switch circuit 3; one end of the key detection circuit 2 is respectively connected with the LED display circuit 1 and the MCU8, and the other end is respectively connected with the first switch circuit 3 and the MCU 8; the power supply circuit 7 supplies power to the MCU8 through the second switch circuit 4, the power supply circuit 7 is further connected to the second switch circuit 4 through the third switch circuit 5, and the third switch circuit 5 is used to control the switching of the second switch circuit 4; the MCU8 is connected with the power supply circuit 7 through the voltage detection circuit 6, and the MCU8 is also connected with the third switch circuit 5 and controls the switch of the third switch circuit 5.
The utility model discloses, through first switch circuit 3, can break off LED display circuit 1 when LED display circuit 1 takes place the short circuit trouble, make button detection circuitry 2 not influenced by the short circuit of LED display circuit 1, still can detect the button signal through MCU 8; in addition, the output voltage of the power supply circuit 7 is measured through the voltage detection circuit 6, and when the output voltage exceeds a preset threshold value, the MCU8 and the power supply circuit 7 are disconnected through the second switch circuit 4 and the third switch circuit 5, so that breakdown of the MCU8 and the LED is avoided, and the probability of short circuit of the LED is reduced.
As shown in fig. 2, preferably, the first switch circuit 3 includes a first MOS transistor 31 and a first resistor 32, where the first MOS transistor 31 is an N-channel MOS transistor; the gate G of the first MOS transistor 31 is connected to one end of the LED display circuit 1 through the first resistor 32, the source S of the first MOS transistor 31 is connected to the other end of the LED display circuit 1, and the drain D of the first MOS transistor 31 is connected to the key detection circuit 2 and the MCU8, respectively. The utility model discloses, when the short circuit takes place for LED display circuit, the grid G of first MOS pipe 31 and source S 'S pressure differential are zero, first MOS pipe 31 ends, consequently button detection circuitry 2' S both ends level does not receive LED display circuit 'S short circuit influence, and MCU8 can normally discern button detection circuitry 2' S signal.
Further, the key detection circuit 2 includes a key switch 21 and a first diode 22, one end of the key switch 21 is connected to the LED display circuit 1 and the MCU8, and the other end of the key switch 21 is connected to the drain of the first MOS transistor 31 and the MCU 8. The utility model discloses, keep apart MCU8 and key switch through first diode, avoid taking place the touch and electrocute.
As shown in fig. 3, preferably, the second switch circuit 4 is a relay 41, and the relay 41 includes a first coil contact 1', a second coil contact 2', a normally closed contact 3', and a movable contact 4'; the first coil contact 1 'is connected with the power supply circuit 7 through the third switch circuit 5, the second coil contact 2' is grounded, the normally closed contact 3 'is connected with the power supply circuit 7, and the movable contact 4' is connected with the MCU 8. The utility model discloses, supply circuit 7 gives MCU8 power supply through relay 41, measures supply circuit 7's output voltage through voltage detection circuit 6, works as when output voltage surpassed preset threshold value, through third switch circuit 5 is with the coil circular telegram of relay, and then breaks off MCU8 and supply circuit 7 to avoid MCU8 and LED to be punctured, reduce the probability that LED took place the short circuit.
Further, the third switching circuit 5 includes a first transistor 51 and a second resistor 52, and the first transistor 51 is an NPN transistor; the base B of the first triode 51 is connected with the MCU8 through the second resistor 52, the collector C of the first triode 51 is connected with the power supply circuit 7, and the emitter E of the first triode 51 is connected with the first coil contact 1'. The utility model discloses, supply circuit 7 gives MCU8 power supply through relay 41, measures supply circuit 7's output voltage through voltage detection circuit 6, works as when output voltage surpassed and predetermines the threshold value, the base of first triode is the high level, first triode switches on for the coil circular telegram of relay, and then breaks off MCU8 and supply circuit 7, thereby avoids MCU8 and LED to be punctured, reduces the probability that LED takes place the short circuit.
More preferably, the voltage detection circuit 6 includes a third resistor 61 and a fourth resistor 62; one end of the third resistor 61 is connected to the power supply circuit 7, the other end is grounded through the fourth resistor 62, and the other end is further connected to the MCU 8.
As shown in fig. 4, preferably, the power supply circuit 7 includes an adapter interface circuit 71, the adapter interface circuit 71 includes an adapter socket 711, a first capacitor 712, and a second capacitor 713, and the first capacitor 712 and the second capacitor 713 are connected in parallel at two ends of the adapter socket 711; one end of the adapter socket 711 is connected to the second switch circuit 4, the voltage detection circuit 6, and the third switch circuit 5, respectively, and the other end is grounded. The utility model discloses, when the user used too high voltage's adapter, can't supply power for MCU. Further, the power supply circuit 7 further comprises a battery interface circuit 72, and the battery interface circuit 72 comprises a battery socket 721 and a second diode 722; one end of the battery receptacle 721 is connected to the adapter receptacle 711 via the second diode 722, and the other end is grounded. The utility model discloses can also supply power to MCU through the battery, on the same hand, when using the too high battery of output voltage, also can't supply power for MCU.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (8)
1. A multifunctional display key circuit is characterized by comprising an LED display circuit, a key detection circuit, a first switch circuit, a second switch circuit, a third switch circuit, a voltage detection circuit, a power supply circuit and an MCU (microprogrammed control unit);
one end of the LED display circuit is respectively connected with the MCU, the key detection circuit and the first switch circuit, and the other end of the LED display circuit is connected with the MCU through the first switch circuit;
one end of the key detection circuit is respectively connected with the LED display circuit and the MCU, and the other end of the key detection circuit is respectively connected with the first switch circuit and the MCU;
the power supply circuit supplies power to the MCU through the second switch circuit, and is also connected with the second switch circuit through a third switch circuit, and the third switch circuit is used for controlling the switch of the second switch circuit;
the MCU is connected with the power supply circuit through the voltage detection circuit and is also connected with the third switch circuit and controls the switch of the third switch circuit.
2. The multi-functional display key circuit of claim 1, wherein the first switch circuit comprises a first MOS transistor and a first resistor, the first MOS transistor being an N-channel MOS transistor;
the grid electrode of the first MOS tube is connected with one end of the LED display circuit through the first resistor, the source electrode of the first MOS tube is connected with the other end of the LED display circuit, and the drain electrode of the first MOS tube is respectively connected with the key detection circuit and the MCU.
3. The multi-functional display key circuit of claim 2, wherein the key detection circuit comprises a key switch and a first diode, one end of the key switch is connected to the LED display circuit and the MCU, and the other end of the key switch is connected to the drain of the first MOS transistor and the MCU.
4. The multi-function display key circuit of claim 3, wherein the second switch circuit is a relay comprising a first coil contact, a second coil contact, a normally closed contact, and a moving contact;
the first coil contact is connected with the power supply circuit through the third switch circuit, the second coil contact is grounded, the normally closed contact is connected with the power supply circuit, and the movable contact is connected with the MCU.
5. The multi-function display key circuit of claim 4, wherein the third switching circuit comprises a first transistor and a second resistor, the first transistor being an NPN transistor;
the base electrode of the first triode is connected with the MCU through the second resistor, the collector electrode of the first triode is connected with the power supply circuit, and the emitter electrode of the first triode is connected with the first coil contact.
6. The multi-function display key circuit of claim 5, wherein the voltage detection circuit comprises a third resistor and a fourth resistor;
one end of the third resistor is connected with the power supply circuit, the other end of the third resistor is grounded through the fourth resistor, and the other end of the third resistor is also connected with the MCU.
7. The multi-function display key circuit of claim 6, wherein the power supply circuit comprises an adapter interface circuit comprising an adapter socket, a first capacitor, and a second capacitor, the first capacitor and the second capacitor being connected in parallel across the adapter socket;
one end of the adapter socket is connected with the second switch circuit, the voltage detection circuit and the third switch circuit respectively, and the other end of the adapter socket is grounded.
8. The multi-function display key circuit of claim 7, wherein the power supply circuit further comprises a battery interface circuit, the battery interface circuit comprising a battery receptacle and a second diode;
one end of the battery socket is connected with the adapter socket through the second diode, and the other end of the battery socket is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023057092.7U CN214380863U (en) | 2020-12-17 | 2020-12-17 | Multifunctional display key circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023057092.7U CN214380863U (en) | 2020-12-17 | 2020-12-17 | Multifunctional display key circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214380863U true CN214380863U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023057092.7U Active CN214380863U (en) | 2020-12-17 | 2020-12-17 | Multifunctional display key circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214380863U (en) |
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2020
- 2020-12-17 CN CN202023057092.7U patent/CN214380863U/en active Active
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