CN219013504U - Solenoid valve drive circuit and equipment with solenoid valve - Google Patents
Solenoid valve drive circuit and equipment with solenoid valve Download PDFInfo
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- CN219013504U CN219013504U CN202223355307.2U CN202223355307U CN219013504U CN 219013504 U CN219013504 U CN 219013504U CN 202223355307 U CN202223355307 U CN 202223355307U CN 219013504 U CN219013504 U CN 219013504U
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Abstract
The utility model relates to the technical field of electromagnetic valve control, and provides an electromagnetic valve driving circuit and equipment with an electromagnetic valve, wherein the electromagnetic valve driving circuit comprises a control circuit, a first driving circuit, a second driving circuit, the electromagnetic valve and a detection circuit; the first driving circuit is used for providing a first driving signal with adjustable voltage amplitude for the first end of the electromagnetic valve under the control of the control circuit; the second driving circuit is used for providing a second driving signal for opening and closing the electromagnetic valve to the second end of the electromagnetic valve under the control of the control circuit; the detection circuit is used for carrying out exclusive OR operation on the first electric signal detected from the second end of the electromagnetic valve and the second electric signal detected from the second driving circuit, outputting a third electric signal to the control circuit, and the third electric signal represents whether the second driving circuit is faulty or not, so that the problem that the reliability and the safety of the electromagnetic valve driving circuit in the prior art are poor is solved, and the reliability and the safety of the electromagnetic valve driving circuit are improved.
Description
Technical Field
The utility model relates to the technical field of electromagnetic valve control, in particular to an electromagnetic valve driving circuit and equipment with an electromagnetic valve.
Background
The electromagnetic valve is a common control element, can be matched with different circuits to realize expected control, and is widely applied in the fields of industrial control, automobile electronics and the like.
In practical applications, a solenoid valve driving circuit needs to be provided for a solenoid valve to drive the solenoid valve to work. The electromagnetic valve driving circuit can drive the electromagnetic valve to be opened and closed, and if the electromagnetic valve driving circuit fails, the normal operation of the electromagnetic valve is affected, so that the reliability and the safety are poor.
Disclosure of Invention
The utility model provides a solenoid valve driving circuit and solenoid valve equipment, which are used for solving the defect of poor reliability and safety of the solenoid valve driving circuit in the prior art and realizing the improvement of the reliability and the safety.
The utility model provides an electromagnetic valve driving circuit which comprises a control circuit, a first driving circuit, a second driving circuit, an electromagnetic valve and a detection circuit, wherein the first driving circuit is connected with the control circuit;
the first driving circuit is respectively connected with the control circuit and the first end of the electromagnetic valve and is used for providing a first driving signal with adjustable voltage amplitude for the first end of the electromagnetic valve under the control of the control circuit; the second driving circuit is respectively connected with the control circuit and the second end of the electromagnetic valve and is used for providing a second driving signal for opening and closing the electromagnetic valve for the second end of the electromagnetic valve under the control of the control circuit;
the detection circuit is respectively connected with the control circuit, the second driving circuit and the second end of the electromagnetic valve, and is used for performing exclusive OR operation on a first electric signal detected from the second end of the electromagnetic valve and a second electric signal detected from the second driving circuit, outputting a third electric signal to the control circuit, wherein the second electric signal corresponds to the state of the electromagnetic valve, and the third electric signal represents whether the second driving circuit fails or not.
According to the electromagnetic valve driving circuit provided by the utility model, the control circuit is further connected with the second end of the electromagnetic valve, and is used for receiving the first electric signal of the second end of the electromagnetic valve, and the first electric signal represents whether the first driving circuit and the electromagnetic valve are in fault or not.
According to the electromagnetic valve driving circuit provided by the utility model, the detection circuit comprises a limiting and filtering circuit and an exclusive OR gate circuit;
the amplitude limiting and filtering circuit is respectively connected with the first end of the detection circuit, the second end of the detection circuit and the exclusive-OR gate circuit; the first end of the detection circuit is connected with the second end of the electromagnetic valve; the second end of the detection circuit is connected with the second driving circuit; the amplitude limiting and filtering circuit is used for carrying out amplitude limiting and filtering on the first electric signal and the second electric signal and outputting the first electric signal and the second electric signal to the exclusive OR gate circuit;
the exclusive-OR gate circuit is also connected with the third end of the detection circuit; the third end of the detection circuit is connected with the first end of the control circuit; the exclusive-OR gate circuit is used for performing exclusive-OR operation on the first electric signal and the second electric signal and outputting the third electric signal to the control circuit.
According to the electromagnetic valve driving circuit provided by the utility model, the amplitude limiting and filtering circuit comprises a first sub-circuit and a second sub-circuit;
the first sub-circuit comprises a first diode, a second diode and a first capacitor; the negative electrode of the first diode, the positive electrode of the second diode and the first end of the first capacitor are respectively connected with the first end of the detection circuit; the first end of the detection circuit is connected with the first input end of the exclusive-OR gate circuit; the anode of the first diode and the second end of the first capacitor are grounded; the cathode of the second diode is connected with the first power supply end;
the second sub-circuit comprises a third diode, a fourth diode and a second capacitor; the negative electrode of the third diode, the positive electrode of the fourth diode and the first end of the second capacitor are respectively connected with the second end of the detection circuit; the second end of the detection circuit is connected with the second input end of the exclusive-OR gate circuit; the anode of the third diode and the second end of the second capacitor are grounded; and the cathode of the fourth diode is connected with the first power supply end.
According to the electromagnetic valve driving circuit provided by the utility model, the first driving circuit comprises a first switch transistor, a second switch transistor and a first resistor;
the grid electrode of the first switching transistor is connected with the second end of the control circuit, the drain electrode of the first switching transistor is connected with the second power end, and the source electrode of the first switching transistor is connected with the first end of the electromagnetic valve; the first switch transistor is used for being conducted under the control of a first control signal of a second end of the control circuit, and providing a power signal with a first voltage amplitude of the second power end as the first driving signal to a first end of the electromagnetic valve;
the grid electrode of the second switching transistor is connected with the third end of the control circuit, the drain electrode of the second switching transistor is connected with the source electrode of the first switching transistor and the first end of the electromagnetic valve, and the source electrode of the second switching transistor is connected with the third power end through the first resistor; the second switching transistor is used for being conducted under the control of a second control signal of a third end of the control circuit, and providing a power signal of a second voltage amplitude of the third power end as the first driving signal to the first end of the electromagnetic valve.
According to the electromagnetic valve driving circuit provided by the utility model, the second driving circuit comprises a third switching transistor and a second resistor;
the grid electrode of the third switching transistor is connected with the fourth end of the control circuit, the drain electrode of the third switching transistor is connected with the second end of the electromagnetic valve, the source electrode of the third switching transistor is connected with the second end of the detection circuit and the first end of the second resistor, and the second end of the second resistor is grounded; the third switching transistor is used for being conducted and disconnected under the control of a third control signal at the fourth end of the control circuit so as to control the opening and closing of the electromagnetic valve.
According to the electromagnetic valve driving circuit provided by the utility model, the control circuit comprises a controller and a pre-driving circuit;
the pre-driving circuit is connected with the first driving circuit;
the controller is respectively connected with the second driving circuit and the detection circuit.
According to the electromagnetic valve driving circuit provided by the utility model, the first switching transistor and the second switching transistor are N-type switching transistors.
According to the electromagnetic valve driving circuit provided by the utility model, the third switching transistor is an N-type switching transistor.
The utility model also provides an apparatus having a solenoid valve comprising a solenoid valve drive circuit as described in any one of the above.
The electromagnetic valve driving circuit and the equipment with the electromagnetic valve provided by the utility model realize the driving function of the electromagnetic valve through the control circuit, the first driving circuit and the second driving circuit, and the detection circuit is also arranged, so that exclusive OR operation can be carried out on a first electric signal from the second end of the electromagnetic valve and a second electric signal corresponding to the state of the electromagnetic valve from the second driving circuit, and a third electric signal is output to the control circuit, wherein the third electric signal represents whether the second driving circuit has a fault or not, thereby realizing the detection of the state of the electromagnetic valve driving circuit, being convenient for timely treatment, and further improving the reliability and the safety of the electromagnetic valve driving.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a solenoid valve driving circuit according to the present utility model;
FIG. 2 is a schematic diagram of a solenoid valve driving circuit according to a second embodiment of the present utility model;
reference numerals:
110: a control circuit; 120: a first driving circuit; 130: a second driving circuit;
140: an electromagnetic valve; 150: a detection circuit; 111: a controller;
112: a pre-drive circuit; 151: a clipping and filtering circuit; 152: an exclusive or gate circuit;
1511: a first sub-circuit; 1512: a second sub-circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The solenoid valve driving circuit of the present utility model is described below with reference to fig. 1 to 2.
As shown in fig. 1, the present embodiment provides a solenoid valve driving circuit, which includes a control circuit 110, a first driving circuit 120, a second driving circuit 130, a solenoid valve 140, and a detection circuit 150;
the first driving circuit 120 is respectively connected to the control circuit 110 and the first end of the electromagnetic valve 140, and is configured to provide a first driving signal with adjustable voltage amplitude to the first end of the electromagnetic valve 140 under the control of the control circuit 110; the second driving circuit 130 is connected to the control circuit 110 and the second end of the solenoid valve 140, respectively, and is configured to provide a second driving signal for opening and closing the solenoid valve 140 to the second end of the solenoid valve 140 under the control of the control circuit 110;
the detection circuit 150 is respectively connected to the control circuit 110, the second driving circuit 130, and the second end of the solenoid valve 140, and is configured to perform an exclusive-or operation on the first electrical signal detected from the second end of the solenoid valve 140 and the second electrical signal detected from the second driving circuit 130, and output a third electrical signal to the control circuit 110, where the second electrical signal corresponds to the state of the solenoid valve 140, and the third electrical signal characterizes whether the second driving circuit 130 has a fault.
Specifically, the control circuit 110 has a first terminal, a second terminal, a third terminal, and a fourth terminal. The detection circuit 150 has a first terminal, a second terminal, and a third terminal. The first driving circuit 120 has a first terminal, a second terminal, and a third terminal. The second driving circuit 130 has a first terminal, a second terminal, and a third terminal. The first end of the control circuit 110 is connected to the third end of the detection circuit 150, the second end is connected to the first end of the first driving circuit 120, the third end is connected to the second end of the first driving circuit 120, and the fourth end is connected to the first end of the second driving circuit 130. The third terminal of the first driving circuit 120 is connected to a first terminal of the solenoid valve 140. A second end of the second driving circuit 130 is connected to a second end of the solenoid valve 140, and a third end is connected to a second end of the detecting circuit 150. A first end of the detection circuit 150 is connected to a second end of the solenoid valve 140.
The first driving circuit 120 is a high-side driving circuit of the solenoid valve 140, and may provide a first driving signal to a first end of the solenoid valve 140, where a voltage amplitude of the first driving signal may be adjustable, and may be a PWM signal. Based on this, the second driving circuit 130 is a low side driving circuit of the solenoid valve 140, and may provide a second driving signal to the second end of the solenoid valve 140, which drives the solenoid valve 140 to open and close. In addition, in this embodiment, a detection circuit 150 is further provided, the second driving circuit 130 may be connected to the detection circuit 150, and the second driving circuit 130 may also output a second electrical signal indicating whether the electromagnetic valve 140 is in an open or closed state to the detection circuit 150.
Under normal conditions, the first driving signal reaches the second end of the electromagnetic valve 140 through the electromagnetic valve 140, the first electric signal can be detected at the second end of the electromagnetic valve 140, when the electromagnetic valve 140 is controlled to be opened, the second electric signal is identical to the first electric signal at the second end of the electromagnetic valve 140, the third electric signal obtained after exclusive-or operation is carried out on the first electric signal and the second electric signal, and if the third electric signal is not the low-level signal, the second driving circuit 130 is indicated to have a fault. For example, when the first driving signal is a PWM signal, after passing through the solenoid valve 140, the detected first electrical signal and the detected second electrical signal are the same under normal conditions, and after the exclusive or operation, the obtained third electrical signal is a low level signal, which indicates that the second driving circuit 130 has failed if not.
Under normal conditions, when the control solenoid valve 140 is closed, the second electric signal keeps a low-level signal, after the first electric signal and the second electric signal are subjected to exclusive-or operation, the first electric signal is unchanged, that is, the obtained third electric signal is the same as the first electric signal, a high-level signal exists, and if the third electric signal does not exist, the second driving circuit 130 is indicated to have a fault.
In this embodiment, the driving function of the electromagnetic valve 140 is implemented through the control circuit 110, the first driving circuit 120 and the second driving circuit 130, and the detection circuit 150 is further provided, which can perform an exclusive-or operation on the first electrical signal from the second end of the electromagnetic valve 140 and the second electrical signal corresponding to the state of the electromagnetic valve 140 from the second driving circuit 130, and output a third electrical signal to the control circuit 110, where the third electrical signal characterizes whether the second driving circuit 130 has a fault, so that the detection of the state of the electromagnetic valve driving circuit is implemented, and the detection circuit is convenient for timely handling, thereby improving the reliability and safety of the driving of the electromagnetic valve 140.
In addition, the detection circuit 150 performs an exclusive-or operation on the first electrical signal and the second electrical signal, so that the processing of the control circuit 110 can be reduced, which is beneficial to practical application.
In an exemplary embodiment, as shown in FIG. 2, the control circuit 110 includes a controller 111 and a pre-drive circuit 112; the pre-driving circuit 112 is connected to the first driving circuit 120; the controller 111 is connected to the second driving circuit 130 and the detecting circuit 150, respectively.
The controller 111 has a first end, a second end, a third end, and a fourth end. The pre-driver circuit 112 has a first terminal, a second terminal, and a third terminal. The first end of the control circuit 110 is the first end of the controller 111, the second end is the first end of the pre-driving circuit 112, the third end is the second end of the pre-driving circuit 112, and the fourth end is the second end of the controller 111. Based on this, a first end of the pre-driving circuit 112 is connected to a first end of the first driving circuit 120, and a second end of the pre-driving circuit 112 is connected to a second end of the first driving circuit 120; the first terminal of the controller 111 is connected to the third terminal of the detection circuit 150, and the second terminal of the controller 111 is connected to the first terminal of the second driving circuit 130. A third terminal of the controller 111 is connected to a third terminal of the pre-driver circuit 112, and can control the pre-driver circuit 112.
The first driving circuit 120 provides a first driving signal with adjustable voltage amplitude to the first end of the electromagnetic valve 140 under the control of the pre-driving circuit 112. The pre-driving circuit 112 in this embodiment may be implemented by a driving circuit in the related art, for example, a gate driving unit with a chip type of L9908 may be used.
The second driving circuit 130 supplies a second driving signal for opening and closing the solenoid valve 140 to a second terminal of the solenoid valve 140 under the control of the controller 111. The detection circuit 150 may send a third electrical signal to the controller 111. The controller 111 may be implemented, for example, using a micro control unit (Microcontroller Unit, MCU).
The processing of the controller 111 may be reduced by exclusive-or-ing the first electrical signal and the second electrical signal by the detection circuit 150.
In this embodiment, the control circuit 110 is implemented through the pre-driving circuit 112 and the controller 111, the circuit structure is simple to implement, the cost is low, the controller 111 can collect the detection result comprehensively, and the user can process flexibly.
In the exemplary embodiment, as shown in FIGS. 1 and 2, the control circuit 110 is also coupled to a second end of the solenoid valve 140, and the control circuit 110 is configured to receive a first electrical signal from the second end of the solenoid valve 140, the first electrical signal being indicative of whether the first drive circuit 120 and the solenoid valve 140 are malfunctioning.
The control circuit 110 also has a fifth terminal. A fifth terminal of the control circuit 110 is connected to a second terminal of the solenoid valve 140.
In the case where the control circuit 110 includes the controller 111 and the pre-drive circuit 112, the fifth terminal of the control circuit 110 is the fourth terminal of the controller 111. The fourth terminal of the controller 111 is connected to a second terminal of the solenoid valve 140.
The controller 111 receives the first electrical signal once every set time, for example, 10 ms.
Under normal conditions, the pre-driving circuit 112 controls the first driving circuit 120 to provide a first driving signal to the first end of the electromagnetic valve 140, the first driving signal reaches the second end of the electromagnetic valve 140 through the electromagnetic valve 140, the controller 111 can receive the first driving signal, if the first driving signal cannot be received, the first driving circuit 120 and the electromagnetic valve 140 are in a fault state, and the circuit is possibly in an open state, so that the states of the first driving circuit 120 and the electromagnetic valve 140 are detected, the fault is accurately positioned, and the reliability and the safety of driving of the electromagnetic valve 140 are further improved.
In an exemplary embodiment, as shown in fig. 2, the detection circuit 150 may include a clipping and filtering circuit 151 and an exclusive or gate circuit 152;
the limiting and filtering circuit 151 is connected to the first end of the detecting circuit 150, the second end of the detecting circuit 150 and the exclusive or gate 152, respectively; a first end of the detection circuit 150 is connected to a second end of the solenoid valve 140; a second end of the detection circuit 150 is connected to the second driving circuit 130; the clipping and filtering circuit 151 is configured to clip and filter the first electrical signal and the second electrical signal and output the first electrical signal and the second electrical signal to the exclusive or gate 152;
the exclusive or gate 152 is further connected to a third terminal of the detection circuit 150; a third terminal of the detection circuit 150 is connected to a first terminal of the control circuit 110; the exclusive or circuit 152 is configured to exclusive or the first electrical signal and the second electrical signal, and output the third electrical signal to the control circuit 110.
The exclusive or gate is a logic gate implementing logic exclusive or, and the exclusive or gate circuit 152 in this embodiment may be an exclusive or gate integrated circuit in the related art.
Because the xor circuit 152 has a voltage working range, the input first electrical signal and second electrical signal need to be limited, so as to meet the voltage working range of the xor circuit 152, and because the first electrical signal and the second electrical signal have interference signals, the interference signals need to be removed through filtering, in this embodiment, the detection circuit 150 is composed of the limiting and filtering circuit 151 and the xor circuit 152, and the first electrical signal and the second electrical signal are input into the xor circuit 152 for performing the xor operation after being limited and filtered by the limiting and filtering circuit 151, so that the detection circuit 150 can be protected, and the detection result is more accurate and reliable.
In the exemplary embodiment, the clipping and filtering circuit 151 includes a first sub-circuit 1511 and a second sub-circuit 1512;
the first sub-circuit 1511 includes a first diode D1, a second diode D2, and a first capacitor C1; the negative electrode of the first diode D1, the positive electrode of the second diode D2, and the first end of the first capacitor C1 are respectively connected to the first end of the detection circuit 150; a first end of the detection circuit 150 is connected to a first input end of the exclusive or gate 152; the anode of the first diode D1 and the second end of the first capacitor C1 are grounded; the cathode of the second diode D2 is connected with the first power supply end;
the second sub-circuit 1512 includes a third diode D3, a fourth diode D4, and a second capacitor C2; the negative electrode of the third diode D3, the positive electrode of the fourth diode D4, and the first end of the second capacitor C2 are respectively connected to the second end of the detection circuit 150; a second terminal of the detection circuit 150 is connected to a second input terminal of the exclusive or gate 152; the anode of the third diode D3 and the second end of the second capacitor C2 are grounded; the cathode of the fourth diode D4 is connected to the first power supply terminal.
The first sub-circuit 1511, which is formed by the first diode D1, the second diode D2 and the first capacitor C1, is used for clipping and filtering the first electrical signal.
The second sub-circuit 1512 formed by the third diode D3, the fourth diode D4 and the second capacitor C2 is configured to clip and filter the second electrical signal.
The voltage at the first power terminal VCC1 satisfies the voltage operating range of the exclusive or gate 152.
The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are zener diodes. These diodes clamp the amplitudes of the first and second electrical signals to VCC1, while the capacitors filter out the interfering signals.
In this embodiment, the filtering and amplitude limiting circuit can be realized by using the simple elements of the diode and the capacitor, so that not only can the good amplitude limiting and filtering effect be achieved, but also the accuracy of the detection result is further improved, thereby improving the reliability and safety of the electromagnetic valve driving circuit, and the circuit structure is simpler, and the cost is reduced.
In an exemplary embodiment, as shown in fig. 2, the first driving circuit 120 includes a first switching transistor Q1, a second switching transistor Q2, and a first resistor R1;
the gate of the first switching transistor Q1 is connected to the second end of the control circuit 110, the drain of the first switching transistor Q1 is connected to the second power end, and the source is connected to the first end of the solenoid valve 140; the first switching transistor Q1 is configured to be turned on under the control of a first control signal of the second terminal of the control circuit 110, and provide a power signal of a first voltage magnitude of the second power terminal as the first driving signal to the first terminal of the solenoid valve 140;
the gate of the second switching transistor Q2 is connected to the third terminal of the control circuit 110, the drain of the second switching transistor Q2 is connected to the source of the first switching transistor Q1 and the first terminal of the solenoid valve 140, and the source of the second switching transistor Q2 is connected to the third power supply terminal through the first resistor R1; the second switching transistor Q2 is configured to be turned on under the control of a second control signal of a third terminal of the control circuit 110, and provide a power signal of a second voltage magnitude of the third power terminal as the first driving signal to the first terminal of the solenoid valve 140.
The first switching transistor Q1 and the second switching transistor Q2 are N-type switching transistors. In this way, the circuit structure is simple.
In the case that the control circuit 110 includes the controller 111 and the pre-driving circuit 112, the gate of the first switching transistor Q1 is connected to the second end of the control circuit 110, specifically, the gate of the first switching transistor Q1 is connected to the first end of the pre-driving circuit 112, and the gate of the second switching transistor Q2 is connected to the third end of the control circuit 110, specifically, the gate of the second switching transistor Q2 is connected to the second end of the pre-driving circuit 112. The pre-driving circuit 112 outputs a first control signal VH to the gate of the first switching transistor Q1 and outputs a second control signal VL to the gate of the second switching transistor Q2, the first and second control signals being PWM signals. The voltage of the second power supply terminal may be higher than the voltage of the third power supply terminal. The second power terminal provides the power signal VCC2 with the first voltage amplitude, and the third power terminal may be a ground terminal. The second power source terminal VCC2 and the first power source terminal VCC1 may be the same power source terminal.
When the first control signal VH output by the pre-driving circuit 112 to the gate of the first switching transistor Q1 is a high level signal, the first switching transistor Q1 is turned on, the power signal of the second power source terminal is provided as a first driving signal to the first terminal of the solenoid valve 140, when the second control signal VL output by the pre-driving circuit 112 to the gate of the second switching transistor Q2 is a high level signal, the second switching transistor Q2 is turned on, the power signal of the third power source terminal is provided as a first driving signal to the first terminal of the solenoid valve 140, so that the generated first driving signal is a PWM signal, and after passing through the solenoid valve 140, the first electric signal can be detected. The effective value of the detected first electric signal is a constant voltage value. The detected first electrical signal may be a constant high level signal after clipping and filtering before being input to the xor gate.
In this embodiment, the first driving circuit 120 is implemented by a two-switch transistor structure, and the PWM signal is provided to the solenoid valve 140, so that a certain energy loss can be reduced.
In an exemplary embodiment, as shown in fig. 2, the second driving circuit 130 includes a third switching transistor Q3 and a second resistor R2;
a gate of the third switching transistor Q3 is connected to the fourth end of the control circuit 110, a drain of the third switching transistor Q3 is connected to the second end of the solenoid valve 140, a source of the third switching transistor Q3 is connected to the second end of the detection circuit 150 and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded; the third switching transistor Q3 is configured to be turned on and off under the control of a third control signal at the fourth terminal of the control circuit 110, so as to control the opening and closing of the solenoid valve 140.
The third switching transistor Q3 is an N-type switching transistor. In this way, the circuit structure is simple.
In the case that the control circuit 110 includes the controller 111 and the pre-driver circuit 112, the gate of the third switching transistor Q3 is connected to the fourth terminal of the control circuit 110, specifically, the gate of the third switching transistor Q3 is connected to the second terminal of the controller 111. The controller 111 may provide a third control signal SEL, which is an I/O signal, to the gate of the third switching transistor Q3, and in the case where the first driving signal is provided, the third switching transistor Q3 is turned on when the third control signal is a high level signal, the solenoid valve 140 is turned on, and the third switching transistor Q3 is turned off when the third control signal is a low level signal, the solenoid valve 140 is turned off. Since the second end of the detection circuit 150 is connected to the source of the third switching transistor Q3, when the third switching transistor Q3 is turned on, the solenoid valve 140 is turned on, the source of the third switching transistor Q3 is turned on to the second end of the solenoid valve 140, the first electrical signal V1 and the second electrical signal V2 are the same, the first end and the second end of the detection circuit 150 input the same electrical signal, and after the exclusive or operation, the obtained third electrical signal Y is a low level signal, and if not the low level signal, it indicates that the third switching transistor Q3 has a fault. When the third switching transistor Q3 is turned off, the solenoid valve 140 is turned off, the second end of the detection circuit 150 is grounded through the second resistor R2, the second electrical signal V2 is always a low-level signal, the first end of the detection circuit 150 can detect the first electrical signal V1, which is a high-level signal, and the first electrical signal V1 and the first electrical signal V are different, and after the exclusive-or operation, the obtained third electrical signal Y is a high-level signal, and if no high-level signal exists, the third switching transistor Q3 fails.
In this embodiment, the second driving circuit 130 is implemented through the third switching transistor Q3, so that not only the first driving circuit 120 can be matched to drive the solenoid valve 140, but also the detection circuit 150 can be matched to detect the state of the solenoid valve driving circuit, and the circuit structure is further simplified.
In addition, if the third switching transistor Q3 is turned off when the first switching transistor Q1 and the second switching transistor Q2 are enabled, the first electric signal V1 is a low-level signal, indicating that the loop of the solenoid valve 140 is shorted to ground, so as to accurately locate the fault.
The utility model also provides an apparatus having a solenoid valve comprising a solenoid valve drive circuit as described in any of the embodiments above. The equipment with the electromagnetic valve can be working machines such as an excavator, a crane, a loader and the like, vehicles such as household automobiles, business automobiles and the like, and the like.
The specific implementation manner of the device with the electromagnetic valve provided in this embodiment may refer to the embodiment of the electromagnetic valve driving circuit, which has the same beneficial effects, and will not be described herein again.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. The electromagnetic valve driving circuit is characterized by comprising a control circuit, a first driving circuit, a second driving circuit, an electromagnetic valve and a detection circuit;
the first driving circuit is respectively connected with the control circuit and the first end of the electromagnetic valve and is used for providing a first driving signal with adjustable voltage amplitude for the first end of the electromagnetic valve under the control of the control circuit; the second driving circuit is respectively connected with the control circuit and the second end of the electromagnetic valve and is used for providing a second driving signal for opening and closing the electromagnetic valve for the second end of the electromagnetic valve under the control of the control circuit;
the detection circuit is respectively connected with the control circuit, the second driving circuit and the second end of the electromagnetic valve, and is used for performing exclusive OR operation on a first electric signal detected from the second end of the electromagnetic valve and a second electric signal detected from the second driving circuit, outputting a third electric signal to the control circuit, wherein the second electric signal corresponds to the state of the electromagnetic valve, and the third electric signal represents whether the second driving circuit fails or not.
2. The solenoid valve driver circuit of claim 1, wherein the control circuit is further coupled to the second end of the solenoid valve, the control circuit to receive the first electrical signal at the second end of the solenoid valve, the first electrical signal being indicative of whether the first driver circuit and the solenoid valve are malfunctioning.
3. The solenoid valve drive circuit according to claim 1 or 2, wherein the detection circuit includes a clipping and filtering circuit and an exclusive or gate circuit;
the amplitude limiting and filtering circuit is respectively connected with the first end of the detection circuit, the second end of the detection circuit and the exclusive-OR gate circuit; the first end of the detection circuit is connected with the second end of the electromagnetic valve; the second end of the detection circuit is connected with the second driving circuit; the amplitude limiting and filtering circuit is used for carrying out amplitude limiting and filtering on the first electric signal and the second electric signal and outputting the first electric signal and the second electric signal to the exclusive OR gate circuit;
the exclusive-OR gate circuit is also connected with the third end of the detection circuit; the third end of the detection circuit is connected with the first end of the control circuit; the exclusive-OR gate circuit is used for performing exclusive-OR operation on the first electric signal and the second electric signal and outputting the third electric signal to the control circuit.
4. A solenoid valve driver circuit according to claim 3 wherein said clipping and filtering circuit comprises a first sub-circuit and a second sub-circuit;
the first sub-circuit comprises a first diode, a second diode and a first capacitor; the negative electrode of the first diode, the positive electrode of the second diode and the first end of the first capacitor are respectively connected with the first end of the detection circuit; the first end of the detection circuit is connected with the first input end of the exclusive-OR gate circuit; the anode of the first diode and the second end of the first capacitor are grounded; the cathode of the second diode is connected with the first power supply end;
the second sub-circuit comprises a third diode, a fourth diode and a second capacitor; the negative electrode of the third diode, the positive electrode of the fourth diode and the first end of the second capacitor are respectively connected with the second end of the detection circuit; the second end of the detection circuit is connected with the second input end of the exclusive-OR gate circuit; the anode of the third diode and the second end of the second capacitor are grounded; and the cathode of the fourth diode is connected with the first power supply end.
5. The solenoid valve drive circuit according to claim 1 or 2, wherein the first drive circuit includes a first switching transistor, a second switching transistor, and a first resistor;
the grid electrode of the first switching transistor is connected with the second end of the control circuit, the drain electrode of the first switching transistor is connected with the second power end, and the source electrode of the first switching transistor is connected with the first end of the electromagnetic valve; the first switch transistor is used for being conducted under the control of a first control signal of a second end of the control circuit, and providing a power signal with a first voltage amplitude of the second power end as the first driving signal to a first end of the electromagnetic valve;
the grid electrode of the second switching transistor is connected with the third end of the control circuit, the drain electrode of the second switching transistor is connected with the source electrode of the first switching transistor and the first end of the electromagnetic valve, and the source electrode of the second switching transistor is connected with the third power end through the first resistor; the second switching transistor is used for being conducted under the control of a second control signal of a third end of the control circuit, and providing a power signal of a second voltage amplitude of the third power end as the first driving signal to the first end of the electromagnetic valve.
6. The solenoid valve drive circuit according to claim 1 or 2, wherein the second drive circuit includes a third switching transistor and a second resistor;
the grid electrode of the third switching transistor is connected with the fourth end of the control circuit, the drain electrode of the third switching transistor is connected with the second end of the electromagnetic valve, the source electrode of the third switching transistor is connected with the second end of the detection circuit and the first end of the second resistor, and the second end of the second resistor is grounded; the third switching transistor is used for being conducted and disconnected under the control of a third control signal at the fourth end of the control circuit so as to control the opening and closing of the electromagnetic valve.
7. The solenoid valve drive circuit according to claim 1 or 2, wherein the control circuit includes a controller and a pre-drive circuit;
the pre-driving circuit is connected with the first driving circuit;
the controller is respectively connected with the second driving circuit and the detection circuit.
8. The solenoid valve driver circuit of claim 5, wherein the first switching transistor and the second switching transistor are N-type switching transistors.
9. The solenoid valve driver circuit of claim 6, wherein the third switching transistor is an N-type switching transistor.
10. An apparatus having a solenoid valve, characterized by comprising a solenoid valve driving circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355307.2U CN219013504U (en) | 2022-12-13 | 2022-12-13 | Solenoid valve drive circuit and equipment with solenoid valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355307.2U CN219013504U (en) | 2022-12-13 | 2022-12-13 | Solenoid valve drive circuit and equipment with solenoid valve |
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| CN219013504U true CN219013504U (en) | 2023-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117706256A (en) * | 2024-02-05 | 2024-03-15 | 中国第一汽车股份有限公司 | Solenoid valve fault diagnosis circuit and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117706256A (en) * | 2024-02-05 | 2024-03-15 | 中国第一汽车股份有限公司 | Solenoid valve fault diagnosis circuit and vehicle |
| CN117706256B (en) * | 2024-02-05 | 2024-06-14 | 中国第一汽车股份有限公司 | Solenoid valve fault diagnosis circuit and vehicle |
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