CN213813855U - Drive circuit fault detection device - Google Patents
Drive circuit fault detection device Download PDFInfo
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- CN213813855U CN213813855U CN202021879159.2U CN202021879159U CN213813855U CN 213813855 U CN213813855 U CN 213813855U CN 202021879159 U CN202021879159 U CN 202021879159U CN 213813855 U CN213813855 U CN 213813855U
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Abstract
The application provides a drive circuit fault detection device, which comprises a drive circuit module, a load simulation module, a first signal generation module and a second signal generation module. The driving circuit module comprises a driving tube and a fly-wheel diode, wherein the negative end of the fly-wheel diode is used for connecting a power supply, and the positive end of the fly-wheel diode is connected with the drain electrode of the driving tube; the load simulation module comprises at least one inductor, the first end of the load simulation module is used for being connected with a power supply, and the second end of the load simulation module is connected with the drain electrode of the driving tube; the first signal generation module is used for generating a first level signal, and the first level signal is used for detecting whether the driving circuit module has a fault or not; and the second signal generation module is used for generating a second level signal, and the second level signal is used for detecting whether the driving circuit module has faults or not. The fault detection device for the driving circuit solves the problem that the error of the detection result of the running state of the driving circuit is large.
Description
Technical Field
The application relates to a circuit detection technology, in particular to a driving circuit fault detection device.
Background
The key components of a driving circuit commonly used in life are a Metal Oxide Semiconductor (MOS) transistor and a freewheeling diode. In practical use, one end of the driving circuit is connected with the control circuit, the other end of the driving circuit is connected with the load side, the driving circuit is used for driving the load side to operate according to signals sent by the control circuit, and specifically, the driving circuit is used for driving various air valves, electromagnets, relays and other devices on the load side to operate.
In the practical use of the driving circuit, the operation conditions of a driving tube and a freewheeling diode in the driving circuit need to be detected so as to ensure that the driving circuit can normally drive various air valves, electromagnets, relays and other devices on the load side to operate. In the conventional scheme, a worker generally judges whether a driving tube, a freewheeling diode and the like in a driving circuit have operation faults or not in a visual observation mode.
However, the fault condition of the driving circuit cannot be accurately known by means of manual visual observation, which easily causes a problem that the error of the detection result of the operation condition of the driving circuit is large.
SUMMERY OF THE UTILITY MODEL
The application provides a drive circuit fault detection device for solve the big problem of testing result error that prior art exists when detecting drive circuit operation conditions.
In one aspect, the present application provides a device for detecting a failure of a driving circuit, including:
a drive circuit failure detection apparatus comprising:
the driving circuit module comprises a driving tube and a fly-wheel diode, wherein the negative pole end of the fly-wheel diode is used for being connected with a power supply, and the positive pole end of the fly-wheel diode is connected with the drain electrode of the driving tube;
the load simulation module comprises at least one inductor, the first end of the load simulation module is used for being connected with the power supply, and the second end of the load simulation module is connected with the drain electrode of the driving tube;
the first signal generation module comprises a first comparator, wherein the positive electrode input end of the first comparator is connected with the positive electrode end of the freewheeling diode, the drain electrode of the driving tube and the second end of the inductor; the first signal generation module is used for generating a first level signal, and the first level signal is used for detecting whether the driving circuit module is in fault;
the second signal generation module comprises a second comparator, wherein the positive electrode input end of the second comparator is connected with the positive electrode end of the freewheeling diode, the drain electrode of the driving tube and the second end of the inductor; the second signal generation module is used for generating a second level signal, and the second level signal is used for detecting whether the driving circuit module is in fault.
In one embodiment, the first signal generating module further includes:
and the first power supply is connected with the negative electrode input end of the first comparator and used for providing fixed voltage for the negative electrode of the first comparator.
In one embodiment, the first signal generating module further includes:
a first voltage-dividing resistor, a first end of which is connected to the first power supply, and a second end of which is connected to a negative input end of the first comparator;
a first end of the first divider resistor is connected with a first end of the first comparator, and a second end of the first divider resistor is connected with a negative input end of the first comparator; and the second end of the second voltage-dividing resistor is grounded.
In one embodiment, the first signal generating module further includes:
the first end of the balance resistor is connected with the positive end of the fly-wheel diode and is connected with the drain electrode of the driving tube; and the second end of the balance resistor is connected with the positive input end of the first comparator.
In one embodiment, the first signal generating module further includes:
the negative electrode of the first voltage stabilizing diode is connected with the negative electrode end of the freewheeling diode, connected with the drain electrode of the driving tube and connected with the positive electrode input end of the first comparator; the anode of the first voltage stabilizing diode is grounded.
In one embodiment, the second signal generating module further includes:
and the anode of the second voltage stabilizing diode is connected with the anode input end of the second comparator, and the cathode of the second voltage stabilizing diode is connected with the anode end of the freewheeling diode and the drain electrode of the driving tube.
In one embodiment, the second signal generating module further includes:
and a first end of the third voltage-dividing resistor is connected with the anode of the second voltage-stabilizing diode and the anode input end of the second comparator, and a second end of the third voltage-dividing resistor is grounded.
In one embodiment, the second signal generating module further includes:
a fourth voltage-dividing resistor, a first end of which is connected to the negative terminal of the freewheeling diode, the drain of the driving transistor, the positive input end of the first comparator, and the second end of the inductor; and the second end of the fourth voltage-dividing resistor is connected with the anode of the second voltage-stabilizing diode.
In one embodiment, the second signal generating module further includes:
and the second power supply is connected with the negative electrode input end of the second comparator and used for providing fixed voltage for the negative electrode of the second comparator.
In one embodiment, the second signal generating module further includes:
a fifth voltage-dividing resistor, wherein a first end of the fifth voltage-dividing resistor is connected with the second power supply, and a second end of the fifth voltage-dividing resistor is connected with a negative electrode input end of the second comparator;
a first end of the sixth voltage-dividing resistor is connected with a second end of the fifth voltage-dividing resistor and is connected with a negative electrode input end of the second comparator; and the second end of the sixth divider resistor is grounded.
The application provides a drive circuit fault detection device, which comprises a drive circuit module, a load simulation module, a first signal generation module and a second signal generation module. The load simulation module comprises at least one inductor, a first end of the load simulation module is used for being connected with the power supply, and a second end of the load simulation module is connected with the drain electrode of the driving tube. The first signal generating module comprises the first comparator, the positive input end of the first comparator is connected with the positive end of the freewheeling diode and the drain electrode of the driving tube, and the first signal generating module is used for generating a first level signal. The second signal generation module comprises a second comparator, and an anode input end of the second comparator is connected with an anode end of the freewheeling diode, a drain electrode of the driving tube and a second end of the inductor. The second signal generation module is used for generating the second level signal. The staff can judge whether the driving circuit module has operation faults or not by combining the first level signal and the second level signal to respectively output high level or low level, and because the first level signal and the second level signal are more accurate and visual, the detection result of the driving circuit module obtained by combining the first level signal and the second level signal is more accurate and has smaller error compared with the detection result obtained by the prior art of manual visual observation. Therefore, the driving circuit fault detection device provided by the application can solve the problem that the detection result error of the operation condition of the driving circuit is large.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram of a driving circuit fault detection apparatus according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a driving circuit fault detection apparatus according to another embodiment of the present application.
Description of the reference numerals
Drive circuit failure detection device 10
Drive tube 110
First signal generation module 300
Second voltage dividing resistor 340
Second signal generation module 400
Third voltage dividing resistor 430
Fourth voltage dividing resistor 440
Fourth voltage dividing resistor 460
Fifth voltage dividing resistor 470
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The driving circuit is a circuit commonly used in life, and includes a Metal Oxide Semiconductor (MOS) transistor and a freewheeling diode, in actual use, one end of the driving circuit is connected to a control circuit, and the other end is connected to a load side, and the driving circuit is configured to drive the load side to operate according to a signal sent by the control circuit. In the practical use of the driving circuit, the operation conditions of a driving tube and a freewheeling diode in the driving circuit need to be detected so as to ensure that the driving circuit can normally drive various air valves, electromagnets, relays and other devices on the load side to operate. In the conventional scheme, a worker generally judges whether a driving tube, a freewheeling diode and the like in a driving circuit have operation faults or not in a visual observation mode. For example, observing whether the driving tube and the fly-wheel diode have hardware defect conditions, device burning, surface damage and the like. However, such a method that the operator observes by naked eyes cannot accurately know whether the driving circuit has an operation failure, for example, the result of the observation by the operator is that neither the driving tube nor the freewheeling diode has a failure, but the driving tube and the freewheeling diode cannot operate normally in actual use, or the result of the observation by naked eyes by the operator is that the driving tube has a failure, but the driving tube can operate normally in actual use. Therefore, the method for observing whether the driving tube and/or the freewheeling diode have operation faults by manual naked eyes has the problem of large detection result error.
Based on this, this application provides a drive circuit fault detection device, carries out the simulation of load with the inductance, and reuse comparator produces the level signal, and this level signal can directly perceivedly can provide information for the staff to make the staff obtain whether this drive circuit has the operation trouble through this level signal.
Referring to fig. 1, the present application provides a driving circuit failure detection apparatus 10, where the driving circuit failure detection apparatus 10 includes a driving circuit module 100, a load simulation module 200, a first signal generation module 300, and a second signal generation module 400.
The driving circuit module 100 includes a driving transistor 110 and a freewheeling diode 120, a negative terminal of the freewheeling diode 120 is used for connecting a power supply, and a positive terminal of the freewheeling diode 120 is connected to a drain of the driving transistor 110. During the use process, the driving tube 110 is in signal connection with a control device, and the control device sends a pulse voltage to the driving tube 110, where the pulse voltage is used to drive the driving tube 110 to conduct. The specification and type of the driving tube 110 and the freewheeling diode 120 can be selected according to actual needs, and the application is not limited. The control device connected to the driving tube 110 may be selected according to actual requirements, as long as the pulse voltage can be transmitted to the driving tube 110 to conduct the driving tube 110.
The load simulation module 200 comprises at least one inductor 210, a first end of the load simulation module 200 is used for connecting the power supply, and a second end of the load simulation module 200 is connected with the drain of the driving tube 110. The load simulation module 200 comprises at least one inductor 210, when the load simulation module 200 comprises only one inductor 210, a first end of the inductor 210 is used for connecting the power supply, and a second end of the inductor 210 is connected to the drain of the driving transistor 110. The load simulation module 200 may further include a plurality of the inductors 210, and the plurality of the inductors 210 may be connected in series or in parallel, and may be selected according to actual needs as long as the load simulation module 200 can realize a characteristic of preventing the alternating current from passing through and allowing the direct current to pass through smoothly. The first end of the load simulation module 200 is used for connecting the power supply, and the second end of the load simulation module 200 is connected to the drain of the driving transistor 110 and the negative end of the freewheeling diode 120, which can also be understood as the load simulation module 200 being connected in parallel to the freewheeling diode 120. When the load simulation module 200 is open, the freewheel diode 120 may transfer the back-emf generated by the load simulation module 200 to the power supply. The specification and model of the inductor 210 may be selected according to actual needs, and the present application is not limited.
The first signal generating module 300 includes a first comparator 310, wherein an anode input terminal of the first comparator 310 is connected to the anode terminal of the freewheeling diode 120, the drain terminal of the driving transistor 110, and the second terminal of the inductor 210. The first signal generating module 300 is configured to generate a first level signal, which is used to detect whether the driving circuit module 100 is faulty or not. The second signal generating module 400 includes a second comparator 410, wherein an anode input terminal of the second comparator 410 is connected to the anode terminal of the freewheeling diode 120, the drain terminal of the driving transistor 110, and the second terminal of the inductor 210. The second signal generating module 400 is configured to generate a second level signal, which is used to detect whether the driving circuit module 100 is faulty or not. The positive input terminals of the first comparator 310 and the second comparator 410 are both connected to the positive terminal of the freewheeling diode 120, the drain of the driving transistor 110 and the second terminal of the inductor 120, that is, the voltages of the positive terminals of the first comparator 310 and the second comparator 310 are determined by the voltage of the drain of the driving transistor 110. While the negative inputs of the first comparator 310 and the second comparator 410 are stable.
When the driving transistor 110 is turned on when the driving circuit module 100 operates without a fault, the first level output by the first comparator 310 is a low level, and the second level output by the second comparator 410 is a low level. In one embodiment, the positive input terminal of the second comparator 410 is further connected to a zener diode, the positive terminal of the zener diode is connected to the positive input terminal of the second comparator 410, and the negative terminal of the zener diode is connected to the positive terminal of the freewheeling diode 120. When the driving transistor 110 is not turned on during the fault-free operation of the driving circuit module 100, the first level signal output by the first comparator 310 is at a high level, and the second level signal output by the second comparator 140 is at a low level due to the action of the zener diode. At the instant when the driving transistor 110 is turned on to turn off, the back emf generated by the inductor 210 is discharged by the freewheeling diode 120.
When the freewheeling diode 120 is reversely soldered or shorted, when the driving transistor 110 is turned on, the driving transistor 110 works in the amplification region because the current flowing through the driving transistor 110 increases instantaneously, so that the voltage at the positive input terminal of the first comparator 310 is greater than the voltage at the negative input terminal of the first comparator 310, the first level output by the first comparator 310 is a high level, and the second level output by the second comparator 410 is a low level. When the freewheeling diode 120 is reverse-connected or short-circuited, the first level output by the first comparator 310 is high when the driving transistor 110 is not conducting. In one embodiment, the positive input terminal of the second comparator 410 is further connected to a zener diode, the positive terminal of the zener diode is connected to the positive input terminal of the second comparator 410, and the negative terminal of the zener diode is connected to the positive terminal of the freewheeling diode 120. When the freewheeling diode 120 is reversely connected or short-circuited and the driving transistor 110 is not conducting, the first level signal output by the first comparator 310 is at a high level, and the second level signal output by the second comparator 140 is at a low level due to the action of the zener diode. At the moment when the driving transistor 110 is turned on or off, since the driving transistor 110 operates in the amplification region, the voltage of the drain of the driving transistor 110 is close to the voltage of the power supply, and the load simulation module 200 generates almost no back electromotive force.
When the freewheeling diode 120 is open-circuited or under-welded, when the driving transistor 110 is turned on, the voltage at the positive input terminal of the first comparator 310 is lower than the voltage at the negative input terminal of the first comparator 310, the first level output by the first comparator 310 is a low level, the voltage at the negative input terminal of the second comparator 410 is higher than the voltage at the positive input terminal of the second comparator 410, and the second level output by the second comparator 410 is a low level. When the freewheeling diode 120 is open-circuited or under-bonded, the first level output by the first comparator 310 is high when the driving transistor 110 is not turned on. In one embodiment, the positive input terminal of the second comparator 410 is further connected to a zener diode, the positive terminal of the zener diode is connected to the positive input terminal of the second comparator 410, and the negative terminal of the zener diode is connected to the positive terminal of the freewheeling diode 120. When the freewheeling diode 120 is open-circuited or under-welded and the driving transistor 110 is not conducting, the first level signal output by the first comparator 310 is at a high level, and the second level signal output by the second comparator 140 is at a low level due to the action of the zener diode. At the moment when the driving transistor 110 is turned on or off, since the freewheeling diode 120 fails to operate as an open circuit or a leakage welding, the back electromotive force generated by the load simulation module 200 cannot be discharged in time, and the drain of the driving transistor 110 generates a high voltage of, for example, several tens of volts, so that the second level signal output by the second comparator 410 is at a high level.
That is to say, the staff can set up signal pickup assembly and be used for gathering this first level signal and this second level signal, compare in artifical visual observation's method, this first level signal and this second level signal can more accurately be reflected the fault situation of this drive circuit module 100, and then can more accurately learn the fault situation of this drive circuit module 100 through this first level signal and this second level signal, solve the big problem of detection result error of drive circuit running state. For example, when the driving transistor 110 is turned on or off, the first level signal is high, and the second level signal is low, it is proved that the freewheeling diode 120 is reverse-connected or short-circuited.
The driving circuit fault detection device 10 provided by the present application includes a driving circuit module 100, a load simulation module 200, a first signal generation module 300, and a second signal generation module 400. The load simulation module 200 includes at least one inductor 210, a first end of the load simulation module 200 is used for connecting the power supply, and a second end of the load simulation module 200 is connected to the drain of the driving transistor 110. The first signal generating module 300 includes the first comparator 310, an anode input terminal of the first comparator 310 is connected to the anode terminal of the freewheeling diode 120 and to the drain of the driving transistor 110, and the first signal generating module 300 is configured to generate a first level signal. The second signal generating module 400 includes the second comparator 410, and an anode input terminal of the second comparator 410 is connected to the anode terminal of the freewheeling diode 120, the drain of the driving transistor 110, and the second terminal of the inductor 210. The second signal generating module 400 is configured to generate the second level signal. The staff can judge whether the driving circuit module 100 has operation fault according to whether the first level signal and the second level signal output are high level or low level respectively, and because the first level signal and the second level signal are more accurate and visual, the detection result of the driving circuit module 100 obtained by the staff according to the first level signal and the second level signal is more accurate and has smaller error compared with the detection result obtained by the prior art method of manual visual observation. Therefore, the driving circuit fault detection device 10 provided by the present application can solve the problem that the detection result of the driving circuit operation state has a large error.
Referring to fig. 2, in an embodiment of the present application, the first signal generating module 300 further includes a first power supply 320, and the first power supply 320 is connected to the negative input terminal of the first comparator 310 for providing a fixed voltage to the negative terminal of the first comparator 310. In one embodiment, the first power supply 320 may select a 24V dc power supply. When the driving circuit module 100 operates normally without failure, the fixed voltage provided by the first power supply 320 is less than the voltage at the positive input terminal of the first comparator 310, and the output of the first comparator 310 is at a high level. When the driving circuit module 100 has an operation failure, for example, the freewheeling diode 120 is reversely soldered or short-circuited, the voltage at the positive input terminal of the first comparator 310 is greater than that at the negative input terminal, and the first level signal output by the first comparator 310 is at a high level. When the driving circuit module 100 operates without a fault, after the driving transistor 110 is turned on, the voltage at the positive input terminal of the first comparator 310 is less than the voltage at the negative input terminal, and the first level output by the first comparator 310 is a low level.
In one embodiment of the present application, the first signal generating module 300 further includes a first voltage dividing resistor 330 and a second voltage dividing resistor 340.
A first segment of the first voltage-dividing resistor 330 is connected to the first power supply 320, and a second segment of the first voltage-dividing resistor 330 is connected to a negative input terminal of the first comparator 310. The first terminal of the second voltage-dividing resistor 340 is connected to the second terminal of the first voltage-dividing resistor 330, and is connected to the negative input terminal of the first comparator 310. The second terminal of the second voltage-dividing resistor 340 is grounded. The resistance, specification and type of the first voltage dividing resistor 330 and the second voltage dividing resistor 340 can be selected according to actual needs, and the application is not limited. In an alternative embodiment, the first power supply 320 may select a 24V dc power supply, the first voltage dividing resistor 330 may select 4.7 kohms, and the second voltage dividing resistor 340 may select 200 kohms.
In an embodiment of the present application, the first signal generating module 300 further includes a balancing resistor 350, a first terminal of the balancing resistor 350 is connected to the positive terminal of the freewheeling diode 120 and to the drain of the driving transistor 110, and a second terminal of the balancing resistor 350 is connected to the positive input terminal of the first comparator 310. The balancing resistor 350 is used to balance the impedance generated by the load simulation module 200, so as to balance the impedance output by the load simulation module 200. The resistance, specification and model of the balancing resistor 350 can be selected according to actual needs, and the application is not limited.
In an embodiment of the present application, the first signal generating module 300 further includes a first zener diode 360, a cathode of the first zener diode 360 is connected to the cathode of the freewheeling diode 120, the drain of the driving transistor 110, and the anode of the first zener diode 360 is connected to the positive input terminal of the first comparator 310, and the anode of the first zener diode 360 is grounded. The cathode of the first zener diode 360 is further connected to the second end of the second voltage-dividing resistor 340. The specification and model of the first zener diode 360 can be selected according to actual needs, and the application is not limited. In an alternative embodiment, the first zener diode 360 may be a zener diode of type 1N4749A, the corresponding first comparator 310 may be of type LM258AD, the resistance of the balancing resistor 350 and the resistance of the first divider resistor 330 may each be 4.7 kohms, and the resistance of the second divider resistor 340 may be 200 kohms.
In an embodiment of the present application, the second signal generating module 400 further includes a second zener diode 420, an anode of the second zener diode 420 is connected to the anode input terminal of the second comparator 410, and a cathode of the second zener diode 420 is connected to the anode terminal of the freewheeling diode 120 and to the drain of the driving transistor 110. When the freewheeling diode 120 is reversely soldered or short-circuited and the driving transistor 110 is not turned on, the second level signal output by the second comparator 410 is at a low level due to the action of the second zener diode 420, and the first level signal output by the first comparator 310 is at a high level at this time. When the freewheeling diode 120 is open-circuited or under-bonded, and the driving transistor 110 is not turned on, the second level signal output by the second comparator 410 is at a low level due to the action of the second zener diode 420, and the first level signal output by the first comparator 310 is at a high level at this time. In an alternative embodiment, the sensitivity of the driver circuit fault detection means 10 may be set by adjusting the zener parameters of the second zener diode 420.
In an embodiment of the present application, the second signal generating module 400 further includes a third voltage dividing resistor 430, and a first terminal of the third voltage dividing resistor 430 is connected to the anode of the second zener diode 420 and to the anode input terminal of the second comparator 410. The second terminal of the third voltage dividing resistor 430 is grounded. The size and type of the third voltage dividing resistor 430 can be selected according to actual needs, and in an alternative embodiment, the resistance of the third voltage dividing resistor 430 can be selected to be 2 kilo-ohms.
In an embodiment of the present application, the second signal generating module 400 further includes a fourth voltage dividing resistor 440, wherein a first terminal of the fourth voltage dividing resistor 440 is connected to the negative terminal of the freewheel diode 120, the drain of the driving transistor 110, the positive input terminal of the first comparator 310, and the second terminal of the inductor 210; a second terminal of the fourth voltage-dividing resistor 440 is connected to the anode of the second zener diode 420. The resistance of the fourth voltage dividing resistor 440 can be selected according to actual needs, and the application is not limited. In an alternative embodiment, the fourth voltage dividing resistor 440 may have a resistance of 20 kilo-ohms.
In an embodiment of the present application, the second signal generating module 400 further includes a second power supply 450, the second power supply 450 is connected to the negative input terminal of the second comparator 410, and the second power supply 450 is configured to provide a fixed voltage to the negative terminal of the second comparator 410. When the driving circuit module 100 operates without failure, i.e., operates normally, and the driving tube 110 is turned on, the voltage at the negative input terminal of the second comparator 410 is greater than the voltage at the positive input terminal, and the output of the second comparator 410 is at a low level. When the driving transistor 110 is not turned on during normal operation of the driving circuit module 100, due to the action of the second zener diode 420, the voltage at the negative input terminal of the second comparator 410 is still higher than the voltage at the positive input terminal, the output of the second comparator 410 is a low level, and at this time, the first level signal output by the first comparator 310 is a low level. When the freewheeling diode 120 is reversely or short-circuited and the driving transistor 110 is turned on, the voltage at the negative input terminal of the second comparator 410 is greater than the voltage at the positive input terminal, the second level signal output by the second comparator 410 is at a low level, and the first level signal output by the first comparator 310 is at a high level. When the freewheeling diode 120 is reversely soldered or shorted and the driving transistor 110 is not turned on, due to the action of the second zener diode 420, the voltage at the negative input terminal of the second comparator 410 is greater than the voltage at the positive input terminal, the second level signal output by the second comparator 410 is at a low level, and the first level signal output by the first comparator 310 is at a high level. When the freewheeling diode 120 is open-circuited or under-bonded, and the driving transistor 110 is turned on, the second level signal output by the second comparator 410 is at a low level, and the first level signal output by the first comparator 310 is at a low level. When the freewheeling diode 120 is open-circuited or under-bonded, and the driving transistor 110 is not conducting, the second level signal output by the second comparator 410 is low due to the second zener diode 420, and the first level signal output by the first comparator 310 is high. When the freewheeling diode 120 is open-circuited or under-welded, the second level signal output by the second comparator 410 is high at a moment when the driving transistor 110 is turned on to be turned off.
In an embodiment of the present application, the second signal generating module 400 further includes a fifth voltage-dividing resistor 460 and a sixth voltage-dividing resistor 470, a first end of the fifth voltage-dividing resistor 460 is connected to the second power supply 450, and a second end of the fifth voltage-dividing resistor 470 is connected to a negative input end of the second comparator 410. A first end of the sixth voltage-dividing resistor 470 is connected to a second end of the fifth voltage-dividing resistor 460, and is connected to a negative input end of the second comparator 410; the second end of the sixth voltage-dividing resistor 470 is grounded. The resistance values of the fifth voltage-dividing resistor 460 and the sixth voltage-dividing resistor 470 can be selected according to actual needs, and in an alternative embodiment, the resistance value of the fifth voltage-dividing resistor 460 can be selected to be 20 kilo-ohms, and the resistance value of the sixth voltage-dividing resistor 470 can be selected to be 2 kilo-ohms.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A drive circuit failure detection device, comprising:
the driving circuit module comprises a driving tube and a fly-wheel diode, wherein the negative pole end of the fly-wheel diode is used for being connected with a power supply, and the positive pole end of the fly-wheel diode is connected with the drain electrode of the driving tube;
the load simulation module comprises at least one inductor, the first end of the load simulation module is used for being connected with the power supply, and the second end of the load simulation module is connected with the drain electrode of the driving tube;
the first signal generation module comprises a first comparator, wherein the positive electrode input end of the first comparator is connected with the positive electrode end of the freewheeling diode, the drain electrode of the driving tube and the second end of the inductor; the first signal generation module is used for generating a first level signal, and the first level signal is used for detecting whether the driving circuit module is in fault;
the second signal generation module comprises a second comparator, wherein the positive electrode input end of the second comparator is connected with the positive electrode end of the freewheeling diode, the drain electrode of the driving tube and the second end of the inductor; the second signal generation module is used for generating a second level signal, and the second level signal is used for detecting whether the driving circuit module is in fault.
2. The apparatus of claim 1, wherein the first signal generation module further comprises:
and the first power supply is connected with the negative electrode input end of the first comparator and used for providing fixed voltage for the negative electrode of the first comparator.
3. The apparatus of claim 2, wherein the first signal generation module further comprises:
a first voltage-dividing resistor, a first end of which is connected to the first power supply, and a second end of which is connected to a negative input end of the first comparator;
a first end of the first divider resistor is connected with a first end of the first comparator, and a second end of the first divider resistor is connected with a negative input end of the first comparator; and the second end of the second voltage-dividing resistor is grounded.
4. The apparatus of claim 1, wherein the first signal generation module further comprises:
the first end of the balance resistor is connected with the positive end of the fly-wheel diode and is connected with the drain electrode of the driving tube; and the second end of the balance resistor is connected with the positive input end of the first comparator.
5. The apparatus of claim 1, wherein the first signal generation module further comprises:
the negative electrode of the first voltage stabilizing diode is connected with the negative electrode end of the freewheeling diode, connected with the drain electrode of the driving tube and connected with the positive electrode input end of the first comparator; the anode of the first voltage stabilizing diode is grounded.
6. The apparatus of claim 1, wherein the second signal generation module further comprises:
and the anode of the second voltage stabilizing diode is connected with the anode input end of the second comparator, and the cathode of the second voltage stabilizing diode is connected with the anode end of the freewheeling diode and the drain electrode of the driving tube.
7. The apparatus of claim 6, wherein the second signal generation module further comprises:
and a first end of the third voltage-dividing resistor is connected with the anode of the second voltage-stabilizing diode and the anode input end of the second comparator, and a second end of the third voltage-dividing resistor is grounded.
8. The apparatus of claim 6, wherein the second signal generation module further comprises:
a fourth voltage-dividing resistor, a first end of which is connected to the negative terminal of the freewheeling diode, the drain of the driving transistor, the positive input end of the first comparator, and the second end of the inductor; and the second end of the fourth voltage-dividing resistor is connected with the anode of the second voltage-stabilizing diode.
9. The apparatus of claim 1, wherein the second signal generation module further comprises:
and the second power supply is connected with the negative electrode input end of the second comparator and used for providing fixed voltage for the negative electrode of the second comparator.
10. The apparatus of claim 9, wherein the second signal generation module further comprises:
a fifth voltage-dividing resistor, wherein a first end of the fifth voltage-dividing resistor is connected with the second power supply, and a second end of the fifth voltage-dividing resistor is connected with a negative electrode input end of the second comparator;
a first end of the sixth voltage-dividing resistor is connected with a second end of the fifth voltage-dividing resistor and is connected with a negative electrode input end of the second comparator; and the second end of the sixth divider resistor is grounded.
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| CN202021879159.2U CN213813855U (en) | 2020-09-01 | 2020-09-01 | Drive circuit fault detection device |
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| CN202021879159.2U CN213813855U (en) | 2020-09-01 | 2020-09-01 | Drive circuit fault detection device |
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