CN111367214A - Key implementation circuit with diagnosis and protection functions - Google Patents
Key implementation circuit with diagnosis and protection functions Download PDFInfo
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- CN111367214A CN111367214A CN202010199355.3A CN202010199355A CN111367214A CN 111367214 A CN111367214 A CN 111367214A CN 202010199355 A CN202010199355 A CN 202010199355A CN 111367214 A CN111367214 A CN 111367214A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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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
- 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
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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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
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- Automation & Control Theory (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a key realizing circuit with diagnosis and protection, which is characterized in that: the device comprises keys, a detection module, an internal micro-processing controller, a resistor and an internal protection circuit, wherein after the internal keys are pressed and identified by the internal micro-processing controller, the micro-processing controller distinguishes that different keys are pressed by starting PWM signals with different duty ratios, and when the keys are blocked, the detection module is informed by the PWM duty ratios. The button realization circuit with diagnosis and protection disclosed by the invention has a self-identification function, and when the circuit output has a short circuit or open circuit state, the state can be self-identified, so that the problem is solved and the positioning is convenient.
Description
Technical Field
The invention relates to the technical field of electronic appliances, in particular to a key implementation circuit with diagnosis and protection functions.
Background
There are keys with various functions in the automobile part module, such as an air conditioner panel module, a door and window switch, etc. In the prior art, keys of one module need to be identified by a detection module, and when ten or more keys exist in the module, a plurality of plug-in pins need to be connected to transfer key information to another module, so that the pins are wasted. The circuit sometimes has a short circuit condition, sometimes is normal, the correct state of the circuit cannot be diagnosed, and the condition that the circuit is delayed in normal operation by splicing open circuits or the electric device is burnt out due to circuit short circuit easily occurs.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a key implementation circuit with diagnosis and protection, which solves the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a key realizing circuit with diagnosis and protection, which is characterized in that: the device comprises keys, a detection module, an internal micro-processing controller, a resistor and an internal protection circuit, wherein after the internal keys are pressed and identified by the internal micro-processing controller, the micro-processing controller distinguishes that different keys are pressed by starting PWM signals with different duty ratios, and when the keys are blocked, the detection module is informed by the PWM duty ratios.
As a further improvement of the scheme, the keys of one module need to be identified by the detection module, when ten or more keys exist in the module and a microprocessor is provided, the key detection circuit identifies the states of the keys and the clamping keys through internal collection, and after the microprocessor MCU identifies and processes the states, the information (pulse width modulation PWM) with the keys is output to another module through a pin of a connector assembly for identification.
As a further improvement of the scheme, the key realization circuit can realize the functions of internal diagnosis and short-circuit protection, and when the output pin is open-circuited, short-circuited to a power supply or short-circuited to the ground, the internal diagnosis can identify the short-circuited state of the power supply and the open-circuited state of the pin through resistance voltage division, so that the error state of the circuit can be diagnosed.
As a further improvement of the scheme, when the output pin is short-circuited to the power supply, the key realization circuit can self-protect the internal components through the internal protection circuit to realize internal short-circuit protection.
As a further improvement of the scheme, KEYs of a KEY-1 KEY, a KEY-2 KEY, a KEY-3 KEY, a KEY-4 KEY, a KEY-5 KEY, a KEY-6 KEY, a KEY-7 KEY, a KEY-8 KEY, a KEY-9 KEY and a KEY-10 KEY are arranged, when the KEY-1 KEY is pressed down, a pin 12 of a microprocessor controller MCU U detects that 5V is changed to 0V, the pin of the microprocessor controller MCU U113 outputs PWM signals with duty ratio of 92% and period of 10ms, and ten periods are sent; the microprocessor controller MCU U22 pin recognizes ten PWM signals with 8% duty ratio and 10ms period.
As a further improvement of the scheme, when a KEY exists in the KEY-1, a pin of a microprocessor controller MCU U12 continuously detects that 0V exceeds 1 minute, a pin of a microprocessor controller MCU U113 outputs a PWM signal with a duty ratio of 88% and a period of 10ms, and ten periods are sent; the microprocessor controller MCU U22 pin recognizes ten PWM signals with 12% duty ratio and 10ms period. When KEY-2 is pressed in sequence, the microprocessor controller MCU U22 pieces signals ten PWM signals with duty ratio of 16% and period of 10 ms.
As a further improvement of the scheme, when the pin output by the connector U3 is short-circuited to the power supply, the pin U112 of the microprocessing controller MCU continuously monitors the voltage of 5V; when the pin output by the connector U3 is open or short-circuited to the ground, the pin of the MCU U112 of the microprocessor controller continuously monitors the voltage of 0V; the pin of the MCU U114 outputs a low level to control the conduction of the triode Q3, if the pin of the MCU U112 is still monitored to be 0V voltage, the pin of the connector U3 outputs a pin short circuit to the ground; if the voltage monitored by the pin MCU U112 of the microprocessor controller is 1.667V, the pin output of the connector U3 is open.
As a further improvement of the scheme, the internal protection circuit comprises a triode Q2, a resistor R5 and a resistor R4, wherein the resistor R5 is connected in series to the base of the triode Q2 and plays a role in series current limiting; when the pin of the U3 output connector is short-circuited to the power supply, the voltage of the emitter resistor R4 exceeds the base threshold of the triode Q2 by 0.7V due to the overlarge emitter current of the triode Q1, at the moment, the triode Q2 is conducted, the base of the triode Q1 is pulled down, and the triode Q1 is closed, so that the effect of protecting the triode Q1 from the ground is achieved; after the triode Q1 is turned off, the emitter of the triode Q1 is 0, the voltage of the emitter resistor R4 is 0V, the triode Q2 is in a cut-off state, and the triode Q1 is turned on; and because the pin output by the connector U3 is short-circuited to the power supply, the current returned to the emitter of the transistor Q1 is overlarge, so that the voltage of the emitter resistor R4 exceeds the base threshold of the transistor Q2 by 0.7V, and a protection cycle is entered.
The invention has the beneficial effects that:
the key realizing circuit with diagnosis and protection disclosed by the invention has the advantages that the number of pins of the connector is minimum, and the cost is low; the circuit has a self-identification function, when the circuit output has a short circuit or open circuit state, the state can be self-identified, and the problem is convenient to locate; and thirdly, when the circuit output has a power supply short circuit, the circuit has a self-protection function and does not burn out internal components.
The key of a module needs to be identified by the detection module, when the module has ten or more keys and a microprocessor, the key detection circuit is designed for correctly identifying the key, the circuit identifies the key and the card key state through internal acquisition, and after the micro-processing controller MCU identifies and processes the key, the key information (pulse width modulation PWM) is output to another module through a connector pin for identification. In order to improve the self-identification and short-circuit resistance of the circuit, the key circuit has internal diagnosis and short-circuit protection functions, namely when an output pin is open-circuited, a power supply is short-circuited or a ground is short-circuited, the fault state of the circuit needs to be diagnosed. In order to protect the circuit, no device is burnt out, and when the output pin is in short circuit with a power supply, the circuit has the function of self-protecting internal components.
Drawings
Fig. 1 is a schematic diagram of a key implementation circuit with diagnosis and protection according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the key implementation circuit with diagnosis and protection provided in this embodiment includes a key, a detection module, an internal microprocessor controller, a resistor, and an internal protection circuit, where after the internal key is pressed and identified by the internal microprocessor controller, the microprocessor controller distinguishes that different keys are pressed by starting PWM signals with different duty ratios, and informs the detection module through the PWM duty ratios when there is a stuck key in each key. The key of a module needs to be identified by the detection module, when the module has ten or more keys and a microprocessor, the key detection circuit is designed for correctly identifying the key, the key detection circuit identifies the key and the card key state through internal collection, and after the microprocessor controller MCU identifies and processes the key, the key information (pulse width modulation PWM) is output to another module through a connector pin for identification.
In order to improve the self-identification and short-circuit resistance of the circuit, the key realization circuit can realize internal diagnosis and short-circuit protection functions, and when the output pin is open-circuited, short-circuited to a power supply or short-circuited to the ground, the internal diagnosis identifies the power supply short-circuit and pin open-circuit states through resistance voltage division, so that the circuit error state can be diagnosed.
For the protection circuit does not have the device that burns out, as the further improvement of this scheme, when the output is pieced together the foot and is short-circuited to the power, the button realization circuit can realize inside short-circuit protection through inside protection circuit self-protection inside components and parts.
The key realizing circuit with diagnosis and protection has the main working principle that after the internal key is pressed down and identified by the internal micro-processing controller, the micro-processing controller distinguishes that different keys are pressed down by starting PWM signals with different duty ratios, and informs a detection module through the PWM duty ratio when each key is blocked; the internal diagnosis identifies the short circuit and open circuit states through resistance voltage division, and the internal short circuit protection is realized through an internal protection circuit.
As shown in fig. 1, KEYs from KEY-1, KEY-2 to KEY-10 exist, when KEY-1 is pressed, a pin of a microprocessor controller MCU U12 detects that 5V is changed to 0V, a pin of a microprocessor controller MCU 113 outputs a PWM signal with a duty ratio of 92% and a period of 10ms, and ten periods are sent; the microprocessor controller MCU U22 pin recognizes ten PWM signals with 8% duty ratio and 10ms period, at this time, when a KEY-1 has a card KEY, the microprocessor controller MCU U12 pin continuously detects that 0V exceeds 1 minute, the microprocessor controller MCU U113 pin outputs 88% duty ratio and 10ms period PWM signals, and ten periods are sent; the microprocessor controller MCU U22 pin recognizes ten PWM signals with 12% duty ratio and 10ms period. When KEY-2 is pressed in sequence, the microprocessor controller MCU U22 splices the signals identified by the pins to ten duty cycles of 16%, PWM signals with a period of 10ms, as detailed in table one below.
| Push-button | Signals recognized by the microprocessing controller MCU U2 | Signal identified by MCU U2 when key is pressed |
| KEY-1 | 8%, period 10ms, 10 periods | 12%, period 10ms, 10 periods |
| KEY-2 | 16%, period 10ms, 10 periods | 20%, period 10ms, 10 periods |
| KEY-3 | 24%, period 10ms, 10 periods | 28%, period 10ms, 10 periods |
| KEY-4 | 32%, period 10ms, 10 periods | 36%, period 10ms, 10 periods |
| KEY-5 | 40%, period 10ms, 10 periods | 44%, period 10ms, 10 periods |
| KEY-6 | 48%, period 10ms, 10 periods | 52% cycle 10ms, 10 periods |
| KEY-7 | 56%, period 10ms, 10 periods | 60%, period 10ms, 10 periods |
| KEY-8 | 64%, period 10ms, 10 periods | 68% period 10ms, 10 periods |
| KEY-9 | 72%, period 10ms, 10 periods | 76%, period 10ms, 10 periods |
| KEY-10 | 80%, period 10ms, 10 periods | 84%, period 10ms, 10 periods |
Watch 1
When the connector U3 outputs a pin for short-circuiting the power supply, the pin U112 of the microprocessing controller MCU continuously monitors the voltage of 5V; when the pin output by the connector U3 is open or short-circuited to the ground, the pin of the MCU U112 of the microprocessor controller continuously monitors the voltage of 0V; the pin of the MCU U114 outputs a low level to control the conduction of the triode Q3, if the pin of the MCU U112 is still monitored to be 0V voltage, the pin of the connector U3 outputs a pin short circuit to the ground; if the voltage monitored by the pin MCU U112 of the MCU U is 1.667V, the pin output of the connector U3 is open at this time, as detailed in table two.
| Pin is pieced together to connector U3 output | Q3 state | Micro-processing controller MCU U112 pin monitoring voltage |
| Short circuit to power supply | Close off | 5V |
| Short circuit to ground | Close off | 0V |
| Open circuit | On (Q1 cut-off) | 1.667V |
Watch two
The internal protection circuit comprises a triode Q2, a resistor R5 and a resistor R4, wherein the resistor R5 is connected in series to the base electrode of the triode Q2 to play a role in series connection and current limitation; when the pin of the U3 output connector is short-circuited to the power supply, the voltage of the emitter resistor R4 exceeds the base threshold of the triode Q2 by 0.7V due to the overlarge emitter current of the triode Q1, at the moment, the triode Q2 is conducted, the base of the triode Q1 is pulled down, and the triode Q1 is closed, so that the effect of protecting the triode Q1 from the ground is achieved; after the triode Q1 is turned off, the emitter of the triode Q1 is 0, the voltage of the emitter resistor R4 is 0V, and the triode Q2 is in a cut-off state, and the triode Q1 is turned on; and because the pin output by the connector U3 is short-circuited to the power supply, the current returned to the emitter of the transistor Q1 is overlarge, so that the voltage of the emitter resistor R4 exceeds the base threshold of the transistor Q2 by 0.7V, and a protection cycle is entered.
The key realizing circuit with diagnosis and protection disclosed by the invention has the advantages that the number of pins of the connector is minimum, and the cost is low; the circuit has a self-identification function, when the circuit output has a short circuit or open circuit state, the state can be self-identified, and the problem is convenient to locate; and thirdly, when the circuit output has a power supply short circuit, the circuit has a self-protection function and does not burn out internal components. The key of a module needs to be identified by the detection module, when the module has ten or more keys and a microprocessor, the key detection circuit is designed for correctly identifying the key, the circuit identifies the key and the card key state through internal acquisition, and after the micro-processing controller MCU identifies and processes the key, the key information (pulse width modulation PWM) is output to another module through a connector pin for identification. In order to improve the self-identification and short-circuit resistance of the circuit, the key circuit has internal diagnosis and short-circuit protection functions, namely when an output pin is open-circuited, a power supply is short-circuited or a ground is short-circuited, the fault state of the circuit needs to be diagnosed. In order to protect the circuit, no device is burnt out, and when the output pin is in short circuit with a power supply, the circuit has the function of self-protecting internal components.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (8)
1. The utility model provides a button realization circuit of area diagnosis and protection which characterized in that: the device comprises keys, a detection module, an internal micro-processing controller, a resistor and an internal protection circuit, wherein after the internal keys are pressed and identified by the internal micro-processing controller, the micro-processing controller distinguishes that different keys are pressed by starting PWM signals with different duty ratios, and when the keys are blocked, the detection module is informed by the PWM duty ratios.
2. The button-implemented circuit with diagnosis and protection of claim 1, wherein: the keys of one module need to be identified by the detection module, when ten or more keys exist in the module and a microprocessor is provided, the key detection circuit identifies the keys and the state of a card key through internal collection, and after the microprocessor MCU identifies and processes the keys, the information (pulse width modulation PWM) with the keys is output to another module through a connector pin for identification.
3. The button-implemented circuit with diagnosis and protection of claim 2, wherein: the key realization circuit can realize the functions of internal diagnosis and short-circuit protection, and when the output pin is open-circuited, short-circuited to a power supply or short-circuited to the ground, the internal diagnosis identifies the open-circuited state of the power supply and the pin through resistance voltage division, so that the error state of the circuit can be diagnosed.
4. The button-implemented circuit with diagnosis and protection of claim 2, wherein: when the output pin is short-circuited to the power supply, the key realization circuit can self-protect the internal components through the internal protection circuit to realize internal short-circuit protection.
5. The button-implemented circuit with diagnosis and protection of claim 4, wherein: setting KEYs of a KEY-1 KEY, a KEY-2 KEY, a KEY-3 KEY, a KEY-4 KEY, a KEY-5 KEY, a KEY-6 KEY, a KEY-7 KEY, a KEY-8 KEY, a KEY-9 KEY and a KEY-10 KEY, detecting that 5V is changed to 0V by a pin of a microprocessor controller MCU U12 after the KEY-1 KEY is pressed, outputting PWM (pulse width modulation) signals with duty ratio of 92% and period of 10ms by a pin of a microprocessor controller MCU U113, and sending ten periods; the microprocessor controller MCU U22 pin recognizes ten PWM signals with 8% duty ratio and 10ms period.
6. The button-implemented circuit with diagnosis and protection of claim 5, wherein: when a KEY exists in KEY-1, a pin of a microprocessor controller MCU U12 continuously detects that 0V exceeds 1 minute, a pin of a microprocessor controller MCU U113 outputs a PWM signal with a duty ratio of 88% and a period of 10ms, and ten periods are sent; a pin of a microprocessor controller MCU U22 identifies ten PWM signals with 12% duty ratio and 10ms period; when KEY-2 is pressed in sequence, the microprocessor controller MCU U22 pieces signals ten PWM signals with duty ratio of 16% and period of 10 ms.
7. The button-implemented circuit with diagnosis and protection of claim 6, wherein: when the connector U3 outputs a pin for short-circuiting the power supply, the pin U112 of the microprocessing controller MCU continuously monitors the voltage of 5V; when the pin output by the connector U3 is open or short-circuited to the ground, the pin of the MCU U112 of the microprocessor controller continuously monitors the voltage of 0V; the pin of the MCU U114 outputs a low level to control the conduction of the triode Q3, if the pin of the MCU U112 is still monitored to be 0V voltage, the pin of the connector U3 outputs a pin short circuit to the ground; if the voltage monitored by the pin MCU U112 of the microprocessor controller is 1.667V, the pin output of the connector U3 is open.
8. The button-implemented circuit with diagnosis and protection of claim 7, wherein: the internal protection circuit comprises a triode Q2, a resistor R5 and a resistor R4, wherein the resistor R5 is connected in series to the base electrode of the triode Q2 to play a role in series connection and current limitation; when the pin of the U3 output connector is short-circuited to the power supply, the voltage of the emitter resistor R4 exceeds the base threshold of the triode Q2 by 0.7V due to the overlarge emitter current of the triode Q1, at the moment, the triode Q2 is conducted, the base of the triode Q1 is pulled down, and the triode Q1 is closed, so that the effect of protecting the triode Q1 from the ground is achieved; after the triode Q1 is turned off, the emitter of the triode Q1 is 0, the voltage of the emitter resistor R4 is 0V, the triode Q2 is in a cut-off state, and the triode Q1 is turned on; and because the pin output by the connector U3 is short-circuited to the power supply, the current returned to the emitter of the transistor Q1 is overlarge, so that the voltage of the emitter resistor R4 exceeds the base threshold of the transistor Q2 by 0.7V, and a protection cycle is entered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010199355.3A CN111367214A (en) | 2020-03-20 | 2020-03-20 | Key implementation circuit with diagnosis and protection functions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199355.3A CN111367214A (en) | 2020-03-20 | 2020-03-20 | Key implementation circuit with diagnosis and protection functions |
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| CN111367214A true CN111367214A (en) | 2020-07-03 |
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| CN202010199355.3A Pending CN111367214A (en) | 2020-03-20 | 2020-03-20 | Key implementation circuit with diagnosis and protection functions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113946226A (en) * | 2020-07-15 | 2022-01-18 | 炬芯科技股份有限公司 | Key processing method and device, readable storage medium and electronic equipment |
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