CN214124811U - Driving circuit - Google Patents
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- CN214124811U CN214124811U CN202120012098.8U CN202120012098U CN214124811U CN 214124811 U CN214124811 U CN 214124811U CN 202120012098 U CN202120012098 U CN 202120012098U CN 214124811 U CN214124811 U CN 214124811U
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Abstract
The utility model provides a driving circuit, which comprises a switch tube, an analog switch, an AND gate circuit, a one-way conduction element, an over-temperature detection unit and an over-current detection unit, wherein one connecting end and the other connecting end of the switch tube are respectively and correspondingly and electrically connected with a power supply end and one end of a driven load, the other end of the driven load is grounded, and the two connecting ends of the analog switch are respectively and correspondingly and electrically connected with a first signal control end and a switch tube control end; the one-way conduction element is arranged adjacent to the switching tube and is electrically connected between one connecting end and the other connecting end of the switching tube; and the three input ends of the AND gate circuit are respectively and electrically connected with the output end of the over-temperature detection unit, the output end of the over-current detection unit and the second signal control end, and the output end of the AND gate circuit is electrically connected with the gating end of the analog switch. The utility model discloses a drive circuit has the current protect function of the different overcurrent section of two-stage, and the task reliability of system is high, and the output signal degree of accuracy is high, and application scope is wide.
Description
Technical Field
The utility model relates to a drive circuit with two-stage overcurrent protection function, belonging to the design field of control systems, as a motor drive circuit, especially suitable for being used in an electric retraction and electric turning control system of an aircraft landing gear; the electromagnetic valve driving circuit has the same protection function with the motor driving circuit, so that the electromagnetic valve driving circuit can also be used for driving the load work of the electromagnetic valve by a hydraulic system for landing gear retraction and brake control.
Background
For a motor used for driving the retraction and turning functions of an undercarriage in an airplane undercarriage control system, when the motor works under an overload condition for a long time (the motor works in an overload state), an insulating material is easy to become brittle, the service life of the insulating material is shortened, and the motor can be damaged in a serious condition. In the prior art, a DSP sends a retraction/turning signal, and a normal signal passes through a driving circuit with a protection device and finally reaches a load such as a motor and the like, as shown in FIG. 1. If the current is relatively low, a simple self-recovery fuse can be used to realize the protection function; however, the motor for protecting the retraction, extension and turning functions of the landing gear in the landing gear control system of the aircraft cannot realize the protection function by using a simple self-recovery fuse due to relatively large current, but realizes the protection function by using a driving circuit with the protection function, which is composed of a power relay(s), a current amplifier, a voltage comparator and the like, as shown in fig. 2, the driving circuit with the protection function in fig. 1 is a schematic circuit structure diagram. In fig. 2, the current detection resistor and the shunt detector are used for detecting and amplifying the current flowing through the motor, and if the current exceeds the maximum allowable current flowing through the motor, the current is converted into a voltage signal, and then the voltage signal is compared with a preset voltage value by the voltage comparator, a high level is generated at the output end of the voltage comparator, so that the triode is turned on, i.e., a low level signal is provided for the enabling end of the power relay, so that the power relay is turned off, and the protection effect is realized.
The driving circuit has the following disadvantages:
(1) the protection function can be played only when the current flowing through the motor exceeds the maximum allowable current flowing through the motor, if the motor works in an overload mode, namely the current exceeds the normal working current of the motor, but does not exceed the maximum allowable current flowing through the motor, the driving circuit cannot play a role, and the motor in long-term overload operation can damage precision components in the circuit and influence the safety of the circuit.
(2) When the vibration of the aircraft landing gear is large, the mechanical contact of the power relay may vibrate along with the aircraft landing gear, so that uncontrollable closing and opening operations occur, a fault of signal interruption is easy to occur, and the vibration resistance of the driving circuit is poor.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is that the drive circuit to being used for driving the undercarriage to receive and release and turn the motor of function can't play a role and anti vibration ability poor problem when the electric current surpasses the normal operating current of motor but does not surpass the maximum allowable electric current that flows through of motor among the prior art, provides a drive circuit.
In order to solve the technical problem, the utility model discloses a technical scheme is: a driving circuit comprises a switch tube, an analog switch, an AND gate circuit with three input ends and a one-way conduction element, wherein one connecting end and the other connecting end of the switch tube are respectively and correspondingly electrically connected with a power supply end and one end of a driven load, the other end of the driven load is grounded, and the two connecting ends of the analog switch are respectively and correspondingly electrically connected with a first signal control end and a switch tube control end;
the unidirectional conductive element is arranged adjacent to the switch tube and is electrically connected between one connecting end and the other connecting end of the switch tube, the voltages of the power supply end and one end of the driven load are respectively VA and VB, the voltage difference value of the two ends is delta _ V when the unidirectional conductive element is conducted is defined, and the structure of the unidirectional conductive element is as follows: when VA + delta _ V is larger than VB, the one-way conduction element is in a non-conduction state, and when VA + delta _ V is smaller than or equal to VB, the one-way conduction element is in a conduction state;
the drive circuit further includes:
an over-temperature detection unit: the temperature sensor is used for detecting the temperature value of the switching tube and respectively and correspondingly outputting a low level and a high level when the temperature value of the switching tube exceeds or does not exceed a preset temperature value;
an overcurrent detection unit: the current detection circuit is used for detecting the current flowing through the driven load and correspondingly outputting a low level and a high level when the current flowing through the driven load exceeds or does not exceed a preset current value;
and the three input ends of the AND gate circuit are respectively and electrically connected with the output end of the over-temperature detection unit, the output end of the over-current detection unit and the second signal control end, and the output end of the AND gate circuit is electrically connected with the gating end of the analog switch.
The utility model discloses in, when the load takes place to block up commentaries on classics or load instantaneous current when too big (the instantaneous current of flowing through the load in very short time sharply risees), overcurrent detection unit can export the low level when being driven load current and surpassing the default, make AND gate circuit output low level, thereby make the switch tube non-conductive, nevertheless because still have partial current can not disappear completely in the twinkling of an eye at the switch tube disconnection, then consume remaining electric current with thermal form through the diode this moment (the voltage VB of being driven load one end probably surpasss VA + delta _ V in the twinkling of an eye that the switch tube is turn-off through setting up one-way conduction element, after the switch tube disconnection, can release through one-way conduction element by the electric charge of driving load one end accumulation). The power supply end of the power supply no longer supplies power to the load, and the load is protected. When the load is overloaded to work, namely the load current exceeds the normal working current of the load, but the load current does not exceed the maximum allowable current of the load, the switching tube can generate heat, after a certain time, the overtemperature detection unit can detect that the temperature of the switching tube exceeds a preset temperature value and output a low level, so that the AND gate circuit outputs the low level, the switching tube is not conducted, the power supply for the load is not performed, and the load is protected. And the analog switch adopting the chip form does not have a mechanical contact, so that the uncontrollable turn-off or turn-on is not easy to occur, and the vibration resistance of the driving circuit is better.
Further, the driving circuit further includes a controller, and the first signal control terminal and the second signal control terminal are a first IO interface terminal and a second IO interface terminal of the controller, respectively.
Further, the over-temperature detection unit includes:
the temperature sensor is used for detecting the temperature of the switching tube and converting the temperature of the switching tube into a voltage signal;
the temperature controller is used for outputting 0 voltage when the temperature value of the switching tube exceeds a preset temperature value and outputting a signal which is the same as the output value of the temperature sensor when the temperature value of the switching tube does not exceed the preset temperature value;
the A/D conversion circuit is used for converting the output value of the temperature control instrument into a digital signal;
the controller is provided with a third IO interface end serving as an output end of the over-temperature detection unit, is used for receiving the digital signal and outputting a low level through the third IO interface end when the digital signal is a low level, and otherwise, outputting a high level through the third IO interface end;
the temperature sensor, the temperature controller, the A/D conversion circuit and the controller are electrically connected in sequence.
In this application, utilize the controller to receive digital signal to can carry out real time monitoring to the temperature of switch tube.
Further, the output end of the over-temperature detection unit and the output end of the temperature sensor are respectively and electrically connected with the input end of the controller. Through the setting, the levels received by the two input ends of the controller for receiving the over-temperature detection unit and the temperature sensor can be compared, if the levels are opposite in comparison result, under the condition that other components and parts are out of consideration, and only when the temperature controller fails, the temperature controller is indicated to fail, so that the circuit can be rapidly positioned when the circuit fails.
Further, the overcurrent detection unit comprises a current sensor for detecting the current flowing through the driven load, an I/V conversion circuit electrically connected with the output of the current sensor, and a voltage comparator connected to one input end of the AND circuit, wherein two input ends of the voltage comparator are respectively and correspondingly and electrically connected with the output end of the I/V conversion circuit and the reference voltage end.
Further, the output end of the over-current detection unit and the output end of the I/V conversion circuit are respectively and electrically connected with the input end of the controller. Through the arrangement, the levels received by the two input ends of the controller for receiving the overcurrent detection unit and the I/V conversion circuit can be compared, if the levels are opposite in comparison result, and under the condition that faults of other components are not considered, only when faults of the voltage comparator are considered, the faults of the voltage comparator are indicated, so that the faults can be quickly positioned when the circuit is in faults.
Furthermore, the one-way conduction element is a diode, and the cathode and the anode of the diode are respectively and correspondingly electrically connected with one connecting end and the other connecting end of the switching tube.
Further, the diode is a light emitting diode. With this arrangement, the consumption of the remaining load current can be judged by whether or not the diode is lit.
Further, the switch tube is an N-channel enhanced field effect tube, and the gate, the drain and the source of the N-channel enhanced field effect tube are respectively a control end, a connection end and another connection end of the switch tube.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses can only the problem of one-level protection when motor drive circuit breaks down to current aircraft landing gear electricity receive and releases/electricity when turning, provide a drive protection circuit, can not only solve and resist the vibration in-process trouble disconnection condition, also solved the long-time overload work of load moreover and shortened the problem for the life-span that the load brought, the system has two-stage load protect function, has greatly improved control security, convenient to use, extensive applicability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic representation of a prior art landing gear control system with a protection device.
FIG. 2 is a circuit diagram of the driving circuit of FIG. 1;
fig. 3 is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention;
in the figure, 1, a switch tube, 2, an analog switch, 3, an AND gate circuit, 4, a one-way conduction element, 51, a temperature sensor, 52, a temperature controller, 53, an A/D conversion circuit, 61, a current sensor, 62, an I/V conversion circuit, 63, a voltage comparator, 10, a controller, 20 and a driven load.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 3, the utility model provides a driving circuit, which is characterized in that, including a switch tube 1, an analog switch 2, an and gate circuit 3 with three input ends, and a one-way conduction element 4, one connecting end and the other connecting end of the switch tube 1 are respectively and correspondingly electrically connected with a power supply end and one end of a driven load 20, the other end of the driven load 20 is grounded, and two connecting ends of the analog switch 2 are respectively and correspondingly electrically connected with a first signal control end and a control end of the switch tube 1;
the unidirectional conducting element 4 is arranged adjacent to the switch tube 1 and electrically connected between one connecting end and the other connecting end of the switch tube 1, the voltages of the power supply end and one end of the driven load 20 are respectively VA and VB, the voltage difference value of the two ends when the unidirectional conducting element 4 is conducted is defined as delta _ V, and the structure of the unidirectional conducting element 4 is as follows: when VA + delta _ V > VB, the unidirectional conductive element 4 is in a non-conductive state, and when VA + delta _ V is less than or equal to VB, the unidirectional conductive element 4 is in a conductive state.
delta _ V is preferably the difference between the voltage at the other connection terminal of the switching tube 1 minus the voltage at one connection terminal of the switching tube 1 when the unidirectional conducting element 4 is conducting.
The drive circuit further includes:
an over-temperature detection unit: the temperature sensor is used for detecting the temperature value of the switching tube 1 and respectively and correspondingly outputting a low level and a high level when the temperature value of the switching tube 1 exceeds or does not exceed a preset temperature value;
an overcurrent detection unit: the current detection circuit is used for detecting the current flowing through the driven load 20 and correspondingly outputting a low level and a high level when the current flowing through the driven load 20 exceeds or does not exceed a preset current value;
the three input ends of the and-gate circuit 3 are respectively electrically connected with the output end of the over-temperature detection unit, the output end of the over-current detection unit and the second signal control end, and the output end of the and-gate circuit 3 is electrically connected with the gating end of the analog switch 2.
In this application, the first signal control terminal and the second signal control terminal may be respectively used as a load driving signal and a load working signal. The first signal control terminal may always output a high level. When the second signal control end outputs a high level, the driving circuit is allowed to work, and at the moment, the output level of the AND circuit is influenced by the level of the output end of the over-temperature detection unit and the level of the output end of the over-current detection unit. When the second signal control terminal outputs a low level, it means that the driving circuit is not allowed to operate, i.e. the two connection terminals of the switching tube cannot be connected, and cannot supply power to the driven load 20. When the enable terminal of the analog switch 2 is active (turned on), the load driving signal generated by the first signal control terminal can pass through the analog switch, otherwise, the load driving signal cannot pass through.
The driving circuit further includes a controller 10, and the first signal control terminal and the second signal control terminal are a first IO interface terminal I/O1 and a second IO interface terminal I/O2 of the controller 10, respectively.
The over-temperature detection unit includes:
the temperature sensor 51 is used for detecting the temperature of the switch tube 1 and converting the temperature of the switch tube 1 into a voltage signal;
the temperature controller 52 is used for outputting 0 voltage when the temperature value of the switch tube 1 exceeds a preset temperature value, and outputting a signal with the same value as the output value of the temperature sensor 51 when the temperature value of the switch tube 1 does not exceed the preset temperature value;
an a/D conversion circuit 53 for converting the output value of the temperature controller 52 into a digital signal;
the controller 10 has a third IO interface terminal as an output terminal of the over-temperature detection unit, is configured to receive the digital signal, and is configured to output a low level through the third IO interface terminal when the digital signal is a low level, otherwise, output a high level through the third IO interface terminal.
The controller 10 can be a single chip, a DSP, or an FPGA. Controller 10 may receive the output of A/D conversion circuit 53 through the McBSP or SPI port. The controller 10 receives the output of the a/D conversion circuit 53 and outputs a high level or a low level through the third IO interface terminal, which only involves a simple determination process, that is, if the temperature value of the switch tube 1 exceeds the preset temperature value, the controller 10 receives the 0 level, and outputs the low level through the third IO interface terminal, and if the temperature value of the switch tube 1 does not exceed the preset temperature value, the controller 10 receives a digital signal obtained by a/D conversion of a voltage value corresponding to the temperature value, and the controller 10 outputs the high level through the third IO interface terminal.
The temperature sensor 51, the temperature controller 52, the A/D conversion circuit 53 and the controller 10 are electrically connected in sequence. Preferably, the output end of the over-temperature detection unit and the output end of the temperature sensor 51 are electrically connected with the input end of the controller 10 respectively. In fig. 3, an input terminal of the controller 10 electrically connected to an output terminal of the temperature sensor 51 is not shown. Depending on the type and range of the output signal, the output of the temperature sensor 51 may be converted and then electrically connected to the input of the controller 10, for example, the voltage range may be adjusted by a voltage amplifier, or the output may be converted into a digital signal by an a/D converter. If the level of the output of the temperature sensor 51 received by the controller 10 is not 0, it is considered that the level received by the controller 10 is high.
In the present application, when the temperature value of the switching tube 1 does not exceed the preset temperature value, the temperature controller 52 outputs the same value as the temperature sensor 51. When the temperature value of the switching tube 1 exceeds the preset temperature value, the temperature controller 52 outputs 0 voltage.
The temperature controller 52 may be model TX4H-24C and the A/D conversion circuit 53 may be model ADS 8668. The temperature sensor model may be LMT 85. The analog switch may be model ADG 1401.
The overcurrent detection unit comprises a current sensor 61 for detecting the current flowing through the driven load 20, an I/V conversion circuit 62 electrically connected with the output of the current sensor 61, and a voltage comparator 63 connected to one input end of the AND circuit 3, wherein two input ends of the voltage comparator 63 are respectively and correspondingly electrically connected with the output end of the I/V conversion circuit 62 and a reference voltage end Vref. The voltage of the reference voltage terminal Vref may be set to a voltage value corresponding to a maximum allowable current of the load. The I/V conversion circuit 62 converts the current to a voltage, which may be implemented using a sampling resistor or an operational amplifier, as will be appreciated by those skilled in the art.
The current sensor 61 can detect a real-time current value of the operation of the driven load 20 and can detect whether or not a circuit connecting the power supply terminal to the driven load 20 is disconnected. The model of the current sensor 61 is ZQ100EK 1/10V.
Preferably, the output terminal of the overcurrent detecting unit and the output terminal of the I/V conversion circuit 62 are electrically connected to the input terminal of the controller 10, respectively. The overcurrent detection unit output terminal may be electrically connected to the I/O4 interface terminal of the controller 10. The input of the controller 10, which is electrically connected to the output of the I/V conversion circuit 62, is not shown in fig. 3. Depending on the type and range of the output signal, the output of the I/V conversion circuit 62 may be converted and electrically connected to the input of the controller 10, for example, the voltage range may be adjusted by a voltage amplifier, or the output may be converted into a digital signal by an a/D converter. If the level of the output of the I/V conversion circuit 62 received by the controller 10 is not 0, it is considered that the controller 10 receives a high level.
The unidirectional conducting element 4 is a diode, and the cathode and the anode of the diode are respectively and correspondingly electrically connected with one connecting end and the other connecting end of the switching tube 1.
In a preferred embodiment, the diode is a light emitting diode.
In a preferred embodiment, the switch tube 1 is an N-channel enhancement mode fet, and the gate, the drain, and the source of the N-channel enhancement mode fet are respectively a control terminal, a connection terminal, and another connection terminal of the switch tube 1. Vs is power supply end (+ V)CC /+VDD) And providing voltage for the drain of the MOS tube.
In order to avoid overload work of the motor, the first-stage protection (namely, an over-temperature detection unit) of the protection device plays a role at the moment, the overload work can generate current exceeding the normal work, the temperature of the protection device can continuously rise along with the extension of overload time, and when the temperature reaches a certain temperature, the protection device can be disconnected due to overheating, so that the motor stops working, and various performances of the motor are protected from being seriously damaged; when the motor is started or locked, the current rises sharply in a short time, and if the maximum transient current of the motor is exceeded, irreversible damage can be caused to a circuit for controlling the motor and the motor, at the moment, the second-stage protection (namely, an overcurrent detection unit) of the protection device acts, the protection device can disconnect the motor in a very short time (millisecond), and the circuit is protected from irreversible influence.
The following detailed description is made with reference to fig. 3:
a) under the condition that the driven load 20 normally works (namely, the circuit current works at A1), the temperature sensor 51, the temperature controller 52, the voltage comparator 63 and the like all normally work, the output of the AND gate circuit 3 is high level 1, namely, the enabling end of the analog switch 2 is effective, the load driving signal can start the switch tube 1 to normally work through the analog switch 2, and the circuit normally works;
b) when the driven load 20 is in overload operation, the current in the circuit exceeds the normal operation current but is not larger than the maximum transient current of the driven load (the circuit current is in a process from A1 to A2), the load current passes through the negative pole of the voltage comparator 63, the voltage comparator 63 operates and outputs a high level signal, namely the overcurrent detection unit outputs a high level; at this time, the temperature sensor 51 and the temperature controller 52 also work, that is, the over-temperature detection unit outputs a high level; the output of the and circuit 3 is high level, the analog switch 2 can work normally, the switch tube 1 is started to work, the load always works under the overload condition, along with the time lapse, the temperature sensor 51 can detect the temperature of the switch tube 1 to rise continuously, when the set value of the temperature controller 52 is reached, overheating can be generated to enable the over-temperature detection unit to output low level, namely the analog switch 2 is switched off, the power supply end Vs can not supply power for the driven load 20, and at the moment, the first-stage overcurrent protection plays a role;
c) when the driven load 20 is locked (motor locked) or the working current is instantaneously greater than the maximum transient current of the load (the working current is greater than a 3), the load current passes through the negative electrode of the voltage comparator 63, and at this time, the voltage of the negative electrode of the voltage comparator 63 is higher than the voltage value corresponding to the limit current set by the positive electrode, so that the voltage comparator 63 outputs a low level, that is, the overcurrent detection unit outputs a low level, the and circuit 3 outputs a low level, the analog switch 2 is turned off, the switching tube 2 stops working (drain and grid are turned off), and the power supply end Vs stops supplying power to the driven load 20; considering that transient current still exists at the moment of load disconnection, the residual current is consumed in the form of heat through the diode at this moment (the voltage VB at one end of the driven load may exceed VA + delta _ v at the moment of switching-off of the switching tube.
In the utility model, when the motor current as the load is A1 (normal working current value), the motor load works normally; when the current is from A1 to A2 (A2 is more than A1), the temperature of the MOS tube can accumulate heat along with the time in the process until overheat protection is generated (the specific action time is determined by the rising time of the temperature and the ambient temperature, the protection time is generally from a few seconds to a few minutes), the overheat protection opens the motor load, and the device, the motor load and other circuits are protected from being damaged; when the current rapidly reaches A3 (A3 is more than A2 and is larger than the transient current of the motor), the protection device enters a current limiting mode, the current limiting mode causes MOS heat to be rapidly accumulated, so that overheating protection occurs, and the protection time is generally in the order of ms; generally, the motor can be protected from damage to precise components in the circuit due to long-term overload operation, instantaneous load increase and exceeding of the maximum transient current of the load or short circuit of the load, and the safety of the circuit is improved.
The utility model discloses when solving common undercarriage electricity receive and release/electric turn drive circuit's operation unstability, only one-level protection and security low grade problem, receive and release/turn drive circuit with the undercarriage and according to the problem and the actual demand design that exist before, not only realize the undercarriage and receive and release/the normal work of turning, but also optimized protection system's grade, reach the undercarriage and receive and release/the function that the turn system required and do not damage circuit and motor load, satisfy the requirement of design. The drive circuit has two-stage overcurrent protection functions, can realize that the landing gear electric retraction/electric turning protects the motor from being damaged when the current is overlarge, and can not cause midway circuit break due to vibration and the like.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent. After reading the present invention, modifications of various equivalent forms of the invention by those skilled in the art will fall within the scope of the appended claims. In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
Claims (9)
1. A driving circuit is characterized by comprising a switching tube (1), an analog switch (2), an AND gate circuit (3) with three input ends and a one-way conduction element (4), wherein one connecting end and the other connecting end of the switching tube (1) are respectively and correspondingly electrically connected with a power supply end and one end of a driven load (20), the other end of the driven load (20) is grounded, and the two connecting ends of the analog switch (2) are respectively and correspondingly and electrically connected with a first signal control end and a control end of the switching tube (1);
the unidirectional conducting element (4) is arranged adjacent to the switch tube (1) and is electrically connected between one connecting end and the other connecting end of the switch tube (1), and the voltages of a power supply end and one end of a driven load (20) are respectively VA、VBDefining the voltage difference value between two ends of the unidirectional conducting element (4) when the unidirectional conducting element is conducted as delta _ V, wherein the structure of the unidirectional conducting element (4) is as follows: when V isA+delta_V＞VBWhen the unidirectional conductive element (4) is in a non-conductive state, and when V is in a non-conductive stateA+delta_V≤VBWhen the unidirectional conducting element (4) is in a conducting state;
the drive circuit further includes:
an over-temperature detection unit: the temperature sensor is used for detecting the temperature value of the switching tube (1) and respectively and correspondingly outputting a low level and a high level when the temperature value of the switching tube (1) exceeds or does not exceed a preset temperature value;
an overcurrent detection unit: the current detection circuit is used for detecting the current flowing through the driven load (20) and correspondingly outputting a low level and a high level when the current flowing through the driven load (20) exceeds or does not exceed a preset current value;
the three input ends of the AND gate circuit (3) are respectively and electrically connected with the output end of the over-temperature detection unit, the output end of the over-current detection unit and the second signal control end, and the output end of the AND gate circuit (3) is electrically connected with the gating end of the analog switch (2).
2. The drive circuit according to claim 1, wherein: the driving circuit further comprises a controller (10), and the first signal control end and the second signal control end are respectively a first IO interface end and a second IO interface end of the controller (10).
3. The drive circuit according to claim 2, wherein: the over-temperature detection unit includes:
the temperature sensor (51) is used for detecting the temperature of the switching tube (1) and converting the temperature of the switching tube (1) into a voltage signal;
the temperature controller (52) is used for outputting 0 voltage when the temperature value of the switching tube (1) exceeds a preset temperature value, and outputting a signal with the same output value as that of the temperature sensor (51) when the temperature value of the switching tube (1) does not exceed the preset temperature value;
an A/D conversion circuit (53) for converting the output value of the temperature controller (52) into a digital signal;
the controller (10) is provided with a third IO interface end serving as an output end of the over-temperature detection unit, is used for receiving the digital signal, and is used for outputting a low level through the third IO interface end when the digital signal is a low level, otherwise, outputting a high level through the third IO interface end;
the temperature sensor (51), the temperature controller (52), the A/D conversion circuit (53) and the controller (10) are electrically connected in sequence.
4. The drive circuit according to claim 3, wherein: the output end of the over-temperature detection unit and the output end of the temperature sensor (51) are respectively and electrically connected with the input end of the controller (10).
5. The drive circuit according to claim 1, wherein: the overcurrent detection unit comprises a current sensor (61) for detecting the current flowing through the driven load (20), an I/V conversion circuit (62) electrically connected with the output of the current sensor (61), and a voltage comparator (63) connected to one input end of the AND gate circuit (3), wherein two input ends of the voltage comparator (63) are respectively and correspondingly and electrically connected with the output end of the I/V conversion circuit (62) and a reference voltage end.
6. The drive circuit according to claim 5, wherein: the output end of the overcurrent detection unit and the output end of the I/V conversion circuit (62) are respectively and electrically connected with the input end of the controller (10).
7. The drive circuit according to any one of claims 1 to 6, wherein: the unidirectional conducting element (4) is a diode, and the cathode and the anode of the diode are respectively and correspondingly electrically connected with one connecting end and the other connecting end of the switching tube (1).
8. The drive circuit according to claim 7, wherein: the diode is a light emitting diode.
9. The drive circuit according to any one of claims 1 to 6, wherein: the switch tube (1) is an N-channel enhanced field effect tube, and a grid electrode, a drain electrode and a source electrode of the N-channel enhanced field effect tube are respectively a control end, a connecting end and another connecting end of the switch tube (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116799746A (en) * | 2023-08-16 | 2023-09-22 | 天合光能股份有限公司 | Protection circuit, load protection method and protection system |
| CN116995611A (en) * | 2023-09-26 | 2023-11-03 | 江苏亨通海洋光网系统有限公司 | Circuit drive protection device based on two-stage relay |
| CN117293951A (en) * | 2023-09-06 | 2023-12-26 | 成都华储卡电新能源科技有限公司 | Heavy current protection method and device for discharge MOS tube, medium and electronic equipment |
-
2021
- 2021-01-05 CN CN202120012098.8U patent/CN214124811U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116799746A (en) * | 2023-08-16 | 2023-09-22 | 天合光能股份有限公司 | Protection circuit, load protection method and protection system |
| CN116799746B (en) * | 2023-08-16 | 2023-11-10 | 天合光能股份有限公司 | Protection circuit, load protection method and protection system |
| CN117293951A (en) * | 2023-09-06 | 2023-12-26 | 成都华储卡电新能源科技有限公司 | Heavy current protection method and device for discharge MOS tube, medium and electronic equipment |
| CN116995611A (en) * | 2023-09-26 | 2023-11-03 | 江苏亨通海洋光网系统有限公司 | Circuit drive protection device based on two-stage relay |
| CN116995611B (en) * | 2023-09-26 | 2023-12-15 | 江苏亨通海洋光网系统有限公司 | Circuit drive protection device based on two-stage relay |
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