CN112083350A - Electromagnetic valve detection circuit, control panel, electric device and electromagnetic valve detection method - Google Patents
Electromagnetic valve detection circuit, control panel, electric device and electromagnetic valve detection method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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
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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
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Abstract
The invention is suitable for the technical field of electromagnetic valves, and particularly provides an electromagnetic valve detection circuit, a control panel, an electrical device and an electromagnetic valve detection method, wherein the electromagnetic valve detection circuit comprises a driving unit, a detection unit and a control unit, the control unit is respectively connected with the driving unit, the detection unit and an external electromagnetic valve, and the driving unit is used for opening or disconnecting the electromagnetic valve according to a control signal sent by the control unit when receiving the control signal; the detection unit is used for detecting a feedback signal of the electromagnetic valve and sending the feedback signal to the control unit; the control unit is used for comparing the control signal with the feedback signal and judging whether the electromagnetic valve is in an abnormal state or not according to a comparison result. The state of open circuit or short circuit of the weak current solenoid valve can be detected, so that other components are prevented from being burnt out due to short circuit of the weak current solenoid valve, and the safety is improved.
Description
Technical Field
The invention belongs to the technical field of electromagnetic valves, and particularly relates to an electromagnetic valve detection circuit, a control panel, an electric device and an electromagnetic valve detection method.
Background
The weak current electromagnetic valve is a core device commonly used by a gas water heater, plays a main role in controlling the on-off of gas of the water heater, and is an important guarantee for normal use of the gas water heater, so that once the weak current electromagnetic valve fails, the problem must be solved in time.
The existing weak current electromagnetic valve is often open-circuited or short-circuited in the working process of the gas water heater, if the state of the weak current electromagnetic valve is not detected in time, devices are likely to be burnt out due to short circuit in a very short time (for example, 800ms), so that the whole circuit board needs to be replaced during maintenance, the maintenance cost of the gas water heater is increased, and meanwhile, the safety of products is also influenced.
In summary, there is a need in the art for a technical solution capable of detecting the open circuit or short circuit state of a weak current electromagnetic valve in the operating state of a gas water heater, so as to avoid burning out other components due to the short circuit of the weak current electromagnetic valve.
Disclosure of Invention
The invention provides an electromagnetic valve detection circuit which can detect the fault state of open circuit or short circuit of a weak current electromagnetic valve in the working state of a gas water heater.
The invention is realized in such a way that the electromagnetic valve detection circuit comprises a driving unit, a detection unit and a control unit, wherein the control unit is respectively connected with the driving unit, the detection unit and an external electromagnetic valve,
the driving unit is used for opening or closing the electromagnetic valve according to the control signal when receiving the control signal sent by the control unit;
the detection unit is used for detecting a feedback signal of the electromagnetic valve and sending the feedback signal to the control unit;
the control unit is used for comparing the control signal with the feedback signal and judging whether the electromagnetic valve is in an abnormal state or not according to a comparison result.
Further, the drive unit includes first triode, first electric capacity, diode, first resistance, second resistance and third resistance, the collecting electrode of first triode is connected the solenoid valve, the earthing terminal is connected to the projecting pole of first triode, the base of first triode is connected third resistance one end, the third resistance other end is connected respectively first electric capacity one end and the negative pole of diode, the first electric capacity other end is connected respectively first resistance one end and second resistance one end, the second resistance other end is connected respectively the positive pole and the earthing terminal of diode, the first resistance other end is connected the control unit.
Furthermore, the driving unit further comprises a second triode, a collector of the second triode is connected with a collector of the first triode, an emitter of the second triode is connected with a base of the first triode, and a base of the second triode is connected with the third resistor.
Furthermore, the detection unit comprises a third triode, a fourth resistor, a fifth resistor and a sixth resistor, one end of the fourth resistor is connected with the electromagnetic valve, the other end of the fourth resistor is respectively connected with one end of the fifth resistor and the base of the third triode, the other end of the fifth resistor is respectively connected with the emitter and the grounding end of the third triode, the collector of the third triode is respectively connected with one end of the sixth resistor and the control unit, and the other end of the sixth resistor is connected with the power supply end.
Furthermore, the detection unit further comprises a second capacitor and a seventh resistor, one end of the second capacitor is connected with one end of the seventh resistor, the other end of the second capacitor is connected with a grounding terminal, and the other end of the seventh resistor is connected with a collector of the third triode.
The invention also provides a control panel which comprises the electromagnetic valve detection circuit.
The invention also provides an electrical device which comprises the control panel.
The invention also provides a method for detecting the electromagnetic valve, which comprises the following steps:
sending a control signal to a driving unit so that the driving unit opens or disconnects an electromagnetic valve according to the control signal;
receiving a feedback signal of the electromagnetic valve sent by the detection unit;
and comparing the control signal with the feedback signal, and judging whether the electromagnetic valve is in an abnormal state according to a comparison result.
Further, the step of comparing the control signal with the feedback signal and determining whether the solenoid valve is in an abnormal state according to the comparison result specifically includes:
comparing whether the control signal and the feedback signal are synchronous;
if yes, judging that the electromagnetic valve is in a normal state;
if not, judging that the electromagnetic valve is in an abnormal state.
Further, the step of determining that the solenoid valve is in an abnormal state includes:
and comparing the control signal and the feedback signal, and judging that the electromagnetic valve is open-circuited.
Further, the step of determining that the electromagnetic valve is in an abnormal state includes:
and comparing the control signal and the feedback signal, and judging that the electromagnetic valve is short-circuited.
Furthermore, the electromagnetic valve is connected with a switch, and when the switch is disconnected, the detection method further comprises the following steps:
sending a control signal to the drive unit;
receiving a feedback signal of the electromagnetic valve sent by the detection unit;
comparing the control signal with the feedback signal, and judging whether the electromagnetic valve is in an abnormal state according to a comparison result;
the control signal comprises a duty ratio with a preset width, and the driving unit cannot open the electromagnetic valve according to the control signal.
The electromagnetic valve state monitoring device has the advantages that whether the state of the electromagnetic valve is abnormal or not can be judged in real time by comparing the control signal of the control unit with the detected feedback signal of the electromagnetic valve, the electromagnetic valve is timely disconnected when the state of the electromagnetic valve is abnormal, an electric product is used for stopping working, burning of devices caused by short circuit is avoided, and safety of the electric product is improved.
Drawings
FIG. 1 is a connection block diagram of a solenoid valve detection circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a control unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection between the driving circuit, the detecting circuit and the solenoid valve according to the second to fifth embodiments of the present invention;
FIG. 4 is a flowchart of a solenoid valve detection method according to a sixth embodiment of the present invention;
fig. 5 is a block diagram of an electromagnetic valve detection device according to an eleventh embodiment of the present invention.
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 embodiment of the invention provides a solenoid valve detection circuit, wherein a driving unit 100 opens or disconnects a solenoid valve 400 according to a control signal sent by a control unit 300; the detection unit 200 detects a feedback signal of the solenoid valve 400; the control unit 300 judges whether the solenoid valve 400 is in an abnormal state by comparing the control signal with the feedback signal; if the electromagnetic valve 400 is in the normal state, the driving unit 100 opens the electromagnetic valve 400 according to the control signal, and if the electromagnetic valve 400 is in the abnormal state, the driving unit 100 disconnects the electromagnetic valve 400 according to the control signal; through comparing the control signal of the control unit 300 with the feedback signal of the detected solenoid valve 400, whether the state of the solenoid valve 400 is abnormal or not can be judged in real time, when the state is abnormal, the solenoid valve 400 is timely disconnected, the electric product stops working, the device burnout caused by short circuit is avoided, and the safety of the electric product is improved.
Example one
The present embodiment provides a solenoid valve detecting circuit, as shown in fig. 1, comprising a driving unit 100, a detecting unit 200 and a control unit 300, wherein the control unit 300 is respectively connected to the driving unit 100, the detecting unit 200 and an external solenoid valve 400,
the driving unit 100 is configured to open or close the electromagnetic valve 400 according to a control signal when receiving the control signal sent by the control unit 300;
the detection unit 200 is used for detecting a feedback signal of the solenoid valve 400 and sending the feedback signal to the control unit 300;
the control unit 300 is configured to compare the control signal with the feedback signal, and determine whether the solenoid valve 400 is in an abnormal state according to the comparison result.
The working principle of the electromagnetic valve detection circuit is as follows:
during the use of the electric product (such as a gas water heater), the control unit 300 sends a control signal to the driving unit 100, and the driving unit 100 opens or closes the electromagnetic valve 400 according to the control signal sent by the control unit 300; the detection unit 200 detects a feedback signal of the solenoid valve 400 and transmits the feedback signal to the control unit 300; the control unit 300 judges whether the solenoid valve 400 is in an abnormal state by comparing the control signal with the feedback signal; if the electromagnetic valve 400 is determined to be in the normal state, the driving unit 100 opens the electromagnetic valve 400 according to the control signal, and if the electromagnetic valve 400 is determined to be in the abnormal state, the driving unit 100 disconnects the electromagnetic valve 400 according to the control signal.
Specifically, the solenoid valve 400 is a weak current solenoid valve, for example, a weak current solenoid valve of 24V or less. The control unit 300 may control the weak current solenoid valve to be turned on by transmitting a PWM signal having a preset width of 50% of the duty ratio, and control the weak current solenoid valve to be turned off by transmitting a PWM signal having a preset width of 0% of the duty ratio. The control unit 300 may be, but is not limited to: R5F100FEAFP/LFQP44, the circuit of which is shown in FIG. 2. It is understood that the driving unit 100 and the detecting unit 200 may be connected by jumpers.
In this embodiment, through comparing the control signal of the control unit 300 with the feedback signal of the detected solenoid valve 400, whether the state of the solenoid valve 400 is abnormal can be judged in real time, when abnormal, the solenoid valve 400 is timely disconnected, the electric product stops working, the device burnout caused by short circuit is avoided, and the safety of the electric product is improved.
Through a plurality of tests, the electromagnetic valve detection circuit can realize abnormal detection in a very short time, such as 400ms, so that devices are prevented from being burnt out.
Example two
In this embodiment, on the basis of the first embodiment, as shown in fig. 3, the driving unit 100 includes a first transistor Q6, a first capacitor EC1, a diode D3, a first resistor R32, a second resistor R34, and a third resistor R29, a collector of the first transistor Q6 is connected to the electromagnetic valve 400, an emitter of the first transistor Q6 is connected to a ground terminal, a base of the first transistor Q6 is connected to one end of the third resistor R29, the other end of the third resistor R29 is connected to one end of the first capacitor EC1 and a cathode of the diode D3, the other end of the first capacitor EC1 is connected to one end of the first resistor R32 and one end of the second resistor R34, the other end of the second resistor R34 is connected to an anode and a ground terminal of the diode D3, and the other end of the first resistor R32 is connected to the control unit 300.
In this embodiment, the input end VAL1 of the driving unit 100 receives the control signal from the control unit 300, and after the first resistor R32 limits the current of the control signal, the first capacitor EC1 performs filtering rectification on the input control signal; the second resistor R34 is used as a pull-down resistor to short the interference in the control signal to the ground, so that the purpose of interference resistance is achieved; the diode D3 regulates the voltage of the signal in the line, and the driving unit 100 controls the on/off of the first transistor Q6 according to the control signal of the control unit 300, thereby controlling the solenoid valve 400.
EXAMPLE III
In the present embodiment, on the basis of the second embodiment, as shown in fig. 3, the driving unit 100 further includes a second transistor Q4, a collector of the second transistor Q4 is connected to a collector of the first transistor Q6, an emitter of the second transistor Q4 is connected to a base of the first transistor Q6, and a base of the second transistor Q4 is connected to the third resistor R29.
In this embodiment, the second transistor Q4 is added to the first transistor Q6 to form a homopolar darlington tube structure, so that the signal amplification factor can be improved.
Example four
In the present embodiment, on the basis of the first embodiment, as shown in fig. 3, the detection unit 200 includes a third transistor Q5, a fourth resistor R28, a fifth resistor R33, and a sixth resistor R24, one end of the fourth resistor R28 is connected to the solenoid valve 400, the other end of the fourth resistor R28 is connected to one end of a fifth resistor R33 and a base of the third transistor Q5, the other end of the fifth resistor R33 is connected to an emitter and a ground of the third transistor Q5, a collector of the third transistor Q5 is connected to one end of the sixth resistor R24 and the control unit 300, and the other end of the sixth resistor R24 is connected to an electrical source.
In this embodiment, the fourth resistor R28 is used as a current-limiting resistor, and the sixth resistor R24 is used as a pull-up resistor, so that the base energy is consumed by the fifth resistor R33 during power-off, thereby ensuring reliable turn-off of the third transistor Q5.
EXAMPLE five
In the present embodiment, on the basis of the fourth embodiment, as shown in fig. 3, the detection unit 200 further includes a second capacitor C4 and a seventh resistor R25, one end of the second capacitor C4 is connected to one end of the seventh resistor R25, the other end of the second capacitor C4 is connected to the ground, and the other end of the seventh resistor R25 is connected to the collector of the third transistor Q5.
In this embodiment, the second capacitor C4 and the seventh resistor R25 form an RC filter circuit, which is used for filtering the feedback signal of the detection unit 200 and outputting the filtered feedback signal to the P _ detval (i) port of the control unit 300.
EXAMPLE six
The embodiment provides a method for detecting a solenoid valve, as shown in fig. 4, including the following steps:
step S410, sending a control signal to a driving unit so that the driving unit opens or disconnects an electromagnetic valve according to the control signal;
step S420, receiving a feedback signal of the electromagnetic valve sent by the detection unit;
and step S430, comparing the control signal with the feedback signal, and judging whether the electromagnetic valve is in an abnormal state according to the comparison result.
In this embodiment, through the control signal who compares the control unit and the feedback signal of the solenoid valve that detects, can judge in real time whether unusual the state of solenoid valve, when unusual, realize in time breaking off the solenoid valve, use the electric product stop work, avoid causing the device to burn out because of the short circuit, promoted the electric product security.
EXAMPLE seven
The embodiment provides a method for detecting an electromagnetic valve, which includes, on the basis of the sixth embodiment, comparing a control signal with a feedback signal, and determining whether the electromagnetic valve is in an abnormal state according to a comparison result, and specifically includes:
comparing whether the control signal and the feedback signal are synchronous;
if yes, judging that the electromagnetic valve is in a normal state;
if not, the electromagnetic valve is judged to be in an abnormal state.
It should be noted that, when the signal setting of the driving unit is unchanged and the signal of the detecting unit is set to be opposite to the signal of the driving unit, when comparing whether the control signal and the feedback signal are synchronous, the solenoid valve is in an abnormal state when the control signal and the feedback signal are synchronous, and the solenoid valve is in a normal state when the control signal and the feedback signal are asynchronous. The specific setting can be selected according to the practical application, and is not limited herein.
In this embodiment, whether control signal through comparing the control unit is synchronous with the feedback signal of the solenoid valve that detects, can judge in real time whether the state of solenoid valve is unusual, and then realize in time breaking off the solenoid valve when unusual, promoted consumer safety.
Example eight
The embodiment provides a method for detecting an electromagnetic valve, where on the basis of the seventh embodiment, the step of determining that the electromagnetic valve is in an abnormal state includes:
and if the comparison control signal and the feedback signal are asynchronous, the open circuit of the electromagnetic valve is judged.
Specifically, when the solenoid valve is in a normal state, the control unit 300 sends a high level signal to the input terminal VAL1 of the driving unit 100, the VAL1 receives the high level signal, the second transistor Q4 and the first transistor Q6 are turned on, a voltage drop (e.g., 0.7V) exists in the first transistor Q6, at this time, the third transistor Q5 is turned off, and the power supply terminal pulls up 5V to the output terminal P _ detVal of the detection unit 200, so that the P _ detVal outputs the high level signal. Similarly, the control unit 300 sends a low level signal to the input terminal VAL1 of the driving unit 100, the VAL1 receives the low level signal, the second transistor Q4 and the first transistor Q6 are turned off, and the solenoid valve 400 transmits 24V to the third transistor Q5, so that the third transistor Q5 is turned on, and the output terminal P _ detVal of the detecting unit 200 outputs the low level signal. It can be seen that the control signal of the control unit 300 and the feedback signal of the solenoid valve 400 detected by the detection unit 200 are synchronized, indicating that the solenoid valve 400 is in a normal state.
In the solenoid valve open state, when the control unit 300 sends a low level signal to the input terminal VAL1 of the driving unit 100, the VAL1 receives the low level signal, the second transistor Q4 and the first transistor Q6 are disconnected, and the solenoid valve 400 does not transmit 24V to the third transistor Q5 due to the open circuit of the solenoid valve, so that the third transistor Q5 is disconnected, and the power terminal pulls up 5V to P _ detVal, so that the P _ detVal outputs a high level signal, thus, in the case of the open circuit of the solenoid valve, the low level signal and the high level signal are not synchronized, that is, the control signal of the control unit 300 and the feedback signal of the solenoid valve 400 detected by the detection unit 200 are not synchronized.
In this embodiment, whether control signal through judging the low level is synchronous with the feedback signal of high level, can judge whether the solenoid valve is in the open circuit state, through this judgement, can short-term test out the solenoid valve trouble, in time stop the work of power consumption product, promote the security of product.
Example nine
The present embodiment provides a method for detecting an electromagnetic valve, where on the basis of the seventh embodiment, the step of determining that the electromagnetic valve is in an abnormal state includes:
and if the comparison control signal and the feedback signal are asynchronous, judging that the electromagnetic valve is short-circuited.
In the short-circuit state of the solenoid valve, when the control unit 300 sends a high-level signal to the input terminal VAL1 of the driving unit 100, the VAL1 receives the high-level signal, the second transistor Q4 and the first transistor Q6 are turned on, but due to the short-circuit of the solenoid valve, the solenoid valve continuously transmits 24V to the first transistor Q6, the first transistor Q6 is burned out within a certain time, and the solenoid valve transmits 24V to the third transistor Q5, so that the third transistor Q5 is turned on, and at this time, the P _ detVal outputs a low-level signal. It can be seen that, in the case of a short circuit of the solenoid valve, the high level signal and the low level signal are not synchronized, that is, the control signal of the control unit 300 and the feedback signal of the solenoid valve 400 detected by the detection unit 200 are not synchronized.
In this embodiment, whether control signal through judging the high level is synchronous with the feedback signal of low level, can judge whether the solenoid valve is in the short circuit state, through this judgement, can short-term test out the solenoid valve trouble, in time stop the work of power consumption product, promote the security of product.
Example ten
In this embodiment, on the basis of the sixth embodiment, the solenoid valve is connected to a switch S1, and when the switch S1 is turned off, the method further includes the following steps:
sending a control signal to the drive unit;
receiving a feedback signal of the electromagnetic valve sent by the detection unit;
comparing the control signal with the feedback signal, and judging whether the electromagnetic valve is in an abnormal state according to a comparison result;
the control signal comprises a duty ratio with a preset width, and the driving unit cannot open the electromagnetic valve according to the control signal.
Preferably, the control signal may include a duty ratio with a preset width of 2%, but is not limited thereto.
Specifically, when the switch S1 is closed, the solenoid valve is energized, and when the switch S1 is open, the solenoid valve is de-energized, and no matter whether the switch S1 is closed, the abnormality detection can be realized: the control unit sends a control signal to the driving unit, the driving unit opens or disconnects the electromagnetic valve according to the control signal, if the electromagnetic valve is judged to be in a normal state, the driving unit opens the electromagnetic valve according to the control signal, and if the electromagnetic valve is judged to be in an abnormal state, the driving unit disconnects the electromagnetic valve according to the control signal. The method can realize the abnormity detection in a very short time (400 ms, for example), thereby avoiding burning out the device.
In this embodiment, no matter whether the switch S1 connected to the solenoid valve is closed, the abnormality detection can be implemented, and especially before the solenoid valve works, that is, when the switch S1 is turned off and the solenoid valve is in the power-off state, the abnormal state of the solenoid valve can be detected, thereby avoiding the unsafe hidden trouble in the actual operation of the power-consuming product in the power-on state of the solenoid valve.
EXAMPLE eleven
The present embodiment provides an electromagnetic valve detection apparatus, as shown in fig. 5, including:
a first transmitting unit 510 for transmitting a control signal to the driving unit to make the driving unit turn on or off the solenoid valve according to the control signal;
a first receiving unit 520, configured to receive the feedback signal of the electromagnetic valve sent by the detecting unit;
and a first judging unit 530 for comparing the control signal with the feedback signal and judging whether the solenoid valve is in an abnormal state according to the comparison result.
In this embodiment, through the control signal who compares the control unit and the feedback signal of the solenoid valve that detects, can judge in real time whether unusual the state of solenoid valve, when unusual, realize in time breaking off the solenoid valve, use the electric product stop work, avoid causing the device to burn out because of the short circuit, promoted the electric product security.
Example twelve
In this embodiment, there is provided an electromagnetic valve detecting apparatus, in an eleventh embodiment, the determining unit includes:
the comparison module is used for comparing whether the control signal and the feedback signal are synchronous or not;
the normal module is used for judging that the electromagnetic valve is in a normal state if the comparison control signal and the feedback signal are synchronous;
and the abnormality module is used for judging that the electromagnetic valve is in an abnormal state if the comparison control signal and the feedback signal are asynchronous.
In this embodiment, whether control signal through comparing the control unit is synchronous with the feedback signal of the solenoid valve that detects, can judge in real time whether the state of solenoid valve is unusual, and then realize in time breaking off the solenoid valve when unusual, promoted consumer safety.
EXAMPLE thirteen
This embodiment provides a solenoid valve detection device, and on the twelfth basis of embodiment, control signal is the low level, and feedback signal is the high level, and unusual module includes:
and the open circuit submodule is used for judging that the electromagnetic valve is open when the comparison control signal and the feedback signal are asynchronous.
In this embodiment, whether control signal through judging the low level is synchronous with the feedback signal of high level, can judge whether the solenoid valve is in the open circuit state, through this judgement, can short-term test out the solenoid valve trouble, in time stop the work of power consumption product, promote the security of product.
Example fourteen
This embodiment provides a solenoid valve detection device, and on the twelfth basis of embodiment, control signal is the high level, and feedback signal is the low level, and unusual module includes:
and the short circuit module is used for comparing the control signal and the feedback signal and judging the short circuit of the electromagnetic valve if the control signal and the feedback signal are asynchronous.
In this embodiment, whether control signal through judging the high level is synchronous with the feedback signal of low level, can judge whether the solenoid valve is in the short circuit state, through this judgement, can short-term test out the solenoid valve trouble, in time stop the work of power consumption product, promote the security of product.
Example fifteen
This embodiment provides a solenoid valve detection device, on the basis of the eleventh embodiment, the solenoid valve is connected with a switch, and when the switch breaks, detection device still includes:
a second transmitting unit for transmitting a control signal to the driving unit;
the second receiving unit is used for receiving the feedback signal of the electromagnetic valve sent by the detection unit;
the second judgment unit is used for comparing the control signal with the feedback signal and judging whether the electromagnetic valve is in an abnormal state or not according to a comparison result;
the control signal comprises a duty ratio with a preset width, and the driving unit cannot open the electromagnetic valve according to the control signal.
In this embodiment, no matter whether the switch S1 connected to the solenoid valve is closed, the abnormality detection can be implemented, and especially before the solenoid valve works, that is, when the switch S1 is turned off and the solenoid valve is in the power-off state, the abnormal state of the solenoid valve can be detected, thereby avoiding the unsafe hidden trouble in the actual operation of the power-consuming product in the power-on state of the solenoid valve.
Example sixteen
The present embodiment provides a control board including the solenoid valve detection circuit as described above and other peripheral circuits. Through comparing the control signal of the control unit 300 with the feedback signal of the detected solenoid valve 400, whether the state of the solenoid valve 400 is abnormal or not can be judged in real time, when the state is abnormal, the solenoid valve 400 is timely disconnected, the electric product stops working, the device burnout caused by short circuit is avoided, and the safety of the electric product is improved.
Example seventeen
The embodiment provides an electric device, which comprises the control board and the peripheral components. Through comparing the control signal of the control unit 300 with the feedback signal of the detected solenoid valve 400, whether the state of the solenoid valve 400 is abnormal or not can be judged in real time, when the state is abnormal, the solenoid valve 400 is timely disconnected, the electric product stops working, the device burnout caused by short circuit is avoided, and the safety of the electric product is improved.
Optionally, the electrical device is a water heater.
In summary, the circuit, the method, and the device for detecting the electromagnetic valve 400 provided in the embodiments of the present invention can determine whether the state of the electromagnetic valve 400 is abnormal in real time by comparing the control signal of the control unit 300 with the detected feedback signal of the electromagnetic valve 400, and when the state is abnormal, the electromagnetic valve 400 is turned off in time, and the electric product stops working, so as to avoid the device burnout caused by short circuit, and improve the safety of the electric product. Specifically, in the driving unit 100, a first resistor limits the current of the control signal, and a first capacitor performs filtering rectification on the input control signal; the second resistor is used as a pull-down resistor to short the interference in the control signal to the ground, so that the purpose of interference resistance is achieved; the diode stabilizes voltage of signals in the line, and the driving unit 100 controls the conduction and the disconnection of the first triode according to the control signal of the control unit 300, so as to control the electromagnetic valve 400; through increasing the second triode on the basis of first triode, constitute homopolar Darlington's tube structure, improved the signal amplification factor. In the detection unit 200, the fourth resistor is used as a current-limiting resistor, the sixth resistor is used as a pull-up resistor, and when the power is off, the base energy is consumed by the fifth resistor, so that the reliable turn-off of the third triode is ensured; the second capacitor and the seventh resistor form an RC filter circuit, and are used for filtering the feedback signal of the detection unit 200 and outputting the filtered feedback signal to the control unit 300. In the method, whether the electromagnetic valve 400 is in an open-circuit state or not can be judged by judging whether the low-level control signal and the high-level feedback signal are synchronous or not, and whether the electromagnetic valve 400 is in a short-circuit state or not can be judged by judging whether the high-level control signal and the low-level feedback signal are synchronous or not, so that the fault of the electromagnetic valve 400 can be quickly detected, the work of an electric product can be stopped in time, and the safety of the product is improved. According to the method, no matter whether a switch connected with the electromagnetic valve 400 is closed or not, the abnormal detection can be realized, especially before the electromagnetic valve 400 works, namely the electromagnetic valve 400 is disconnected by the switch in the power-off state, the abnormal state of the electromagnetic valve 400 can be detected, and the unsafe hidden trouble in the actual operation of the power-driven product in the power-on state of the electromagnetic valve 400 is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. The electromagnetic valve detection circuit is characterized by comprising a driving unit, a detection unit and a control unit, wherein the control unit is respectively connected with the driving unit, the detection unit and an external electromagnetic valve,
the driving unit is used for opening or closing the electromagnetic valve according to the control signal when receiving the control signal sent by the control unit;
the detection unit is used for detecting a feedback signal of the electromagnetic valve and sending the feedback signal to the control unit;
the control unit is used for comparing the control signal with the feedback signal and judging whether the electromagnetic valve is in an abnormal state or not according to a comparison result.
2. The electromagnetic valve detection circuit according to claim 1, wherein the driving unit includes a first triode, a first capacitor, a diode, a first resistor, a second resistor, and a third resistor, a collector of the first triode is connected to the electromagnetic valve, an emitter of the first triode is connected to a ground terminal, a base of the first triode is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the first capacitor and a cathode of the diode, the other end of the first capacitor is connected to one end of the first capacitor and one end of the second resistor, the other end of the second resistor is connected to an anode and a ground terminal of the diode, and the other end of the first resistor is connected to the control unit.
3. The circuit for detecting solenoid valve according to claim 2, wherein the driving unit further comprises a second triode, a collector of the second triode is connected to a collector of the first triode, an emitter of the second triode is connected to a base of the first triode, and a base of the second triode is connected to the third resistor.
4. The electromagnetic valve detection circuit according to claim 1, wherein the detection unit includes a third triode, a fourth resistor, a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the electromagnetic valve, the other end of the fourth resistor is respectively connected to one end of the fifth resistor and a base of the third triode, the other end of the fifth resistor is respectively connected to an emitter and a ground of the third triode, a collector of the third triode is respectively connected to one end of the sixth resistor and the control unit, and the other end of the sixth resistor is connected to a power supply end.
5. The electromagnetic valve detection circuit according to claim 4, wherein the detection unit further includes a second capacitor and a seventh resistor, one end of the second capacitor is connected to one end of the seventh resistor, the other end of the second capacitor is connected to ground, and the other end of the seventh resistor is connected to the collector of the third triode.
6. A control board characterized by comprising the solenoid valve detection circuit according to any one of claims 1 to 5.
7. An electrical apparatus, comprising the control board of claim 6.
8. A solenoid valve detection method is characterized by comprising the following steps:
sending a control signal to a driving unit so that the driving unit opens or disconnects an electromagnetic valve according to the control signal;
receiving a feedback signal of the electromagnetic valve sent by the detection unit;
and comparing the control signal with the feedback signal, and judging whether the electromagnetic valve is in an abnormal state according to a comparison result.
9. The solenoid valve detecting method according to claim 8, wherein the step of comparing the control signal with the feedback signal and determining whether the solenoid valve is in an abnormal state according to the comparison result specifically comprises:
comparing whether the control signal and the feedback signal are synchronous;
if yes, judging that the electromagnetic valve is in a normal state;
if not, judging that the electromagnetic valve is in an abnormal state.
10. The electromagnetic valve detection method according to claim 9, wherein the control signal is at a low level, the feedback signal is at a high level, and the step of determining that the electromagnetic valve is in an abnormal state specifically includes:
and comparing the control signal and the feedback signal, and judging that the electromagnetic valve is open-circuited.
11. The electromagnetic valve detection method according to claim 9, wherein the control signal is at a high level, the feedback signal is at a low level, and the step of determining that the electromagnetic valve is in an abnormal state specifically includes:
and comparing the control signal and the feedback signal, and judging that the electromagnetic valve is short-circuited.
12. The method for detecting a solenoid valve according to claim 8, wherein a switch is connected to the solenoid valve, and when the switch is turned off, the method further comprises the steps of:
sending a control signal to the drive unit;
receiving a feedback signal of the electromagnetic valve sent by the detection unit;
comparing the control signal with the feedback signal, and judging whether the electromagnetic valve is in an abnormal state according to a comparison result;
the control signal comprises a duty ratio with a preset width, and the driving unit cannot open the electromagnetic valve according to the control signal.
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| CN113983233A (en) * | 2021-10-26 | 2022-01-28 | 河南驰诚电气股份有限公司 | Household alarm with functions of detecting connection and opening and closing states of electromagnetic valve |
| CN116125892A (en) * | 2023-02-21 | 2023-05-16 | 青岛建邦汽车科技股份有限公司 | Valve control system and method for motor home heater |
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Application publication date: 20201215 |