CN217563313U - Temperature detect switch real time monitoring protection device - Google Patents

Abstract

The utility model discloses a temperature detect switch real time monitoring protection device, including output control module and the control by temperature change protection module who is used for monitoring output control module's operating temperature, output control module is including the current-limiting circuit and the electronic switch that are used for external power supply, control by temperature change protection module includes temperature control circuit and the negative temperature coefficient resistance NTC1 that is used for acquireing the electronic switch temperature, electronic switch includes input, output and is used for ordering about the input and the output is in the drive end that switches on and cut off one of them state, current-limiting circuit's output is connected with electronic switch's input, electronic switch's output and consumer are connected, negative temperature coefficient resistance NTC1 is connected with electronic switch's drive end through temperature control circuit. In this embodiment, the negative temperature coefficient resistor NTC1 is used to detect the temperature of the electronic switch, and then the temperature control circuit is used to control the electronic switch in a feedback manner, so that the stability of the whole circuit is protected, and the damage to components is avoided.

Description

Temperature detect switch real time monitoring protection device

Technical Field

The utility model relates to an electronic circuit control technical field especially relates to a temperature detect switch real time monitoring protection device.

Background

With the development of society and electronic power technology, more and more electric current electric equipment is applied to daily production and daily life, especially low-voltage and high-current electric equipment. However, how to effectively monitor and protect the operation of low-voltage and high-current electric equipment is becoming an urgent problem to be solved.

Generally, a switch is provided between the power source and the electric device to control the operation of the electric device. In the operation process of low-voltage and high-current electric equipment, the switch is easily heated under the influence of high current, and even the switch is burnt out due to overhigh temperature and a fire disaster is caused.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a temperature control switch real-time monitoring protection device, which can solve the problem that the switch generates heat easily to cause accidents in the process of operating the low-voltage heavy-current electric equipment.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a temperature detect switch real time monitoring protection device, is including the output control module who is used for ordering about external consumer to be in operation and closes one of them state and the control by temperature change protection module who is used for monitoring output control module's operating temperature, output control module is including the current-limiting circuit and the electronic switch that are used for external power supply, control by temperature change protection module includes temperature control circuit and the negative temperature coefficient resistance NTC1 who is used for acquireing the electronic switch temperature, electronic switch includes input, output and is used for ordering about the drive end that input and output are in and switch on and cut off one of them state, the output of current-limiting circuit is connected with electronic switch's input, electronic switch's output and consumer are connected, negative temperature coefficient resistance NTC1 passes through temperature control circuit and is connected with electronic switch's drive end.

Preferably, the output control module further comprises an or operation circuit, the or operation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R13, a resistor R12, an operator U1A, an operator U1B, a diode D1, a diode D3, a capacitor C1 and a capacitor C2, a power supply end of the operator U1A is connected with a power supply through the resistor R2, a power supply end of the operator U1B is connected with the power supply through the resistor R4, one end of the resistor R3 is connected with an output end of the current limiting circuit, the other end of the resistor R3 and one end of the capacitor C1 are both connected with a forward input end of the operator U1A, an output end of the operator U1A is connected with one end of the resistor R41 through the diode D1, resistance R12's one end is connected with electronic switch's output, resistance R12's the other end and electric capacity C2's one end all are connected with conveyer U1B's forward input, conveyer U1B's output passes through diode D3 and is connected with resistance R13's one end, resistance R41's the other end and resistance R13's the other end all are connected with resistance R5's one end, resistance R5's the other end and resistance R1's one end all are connected with electronic switch's drive end, electric capacity C1's the other end, electric capacity C2's the other end and resistance R1's the other end all ground connection, the reverse input of arithmetic unit U1A and arithmetic unit U1B's reverse input pass through temperature control circuit ground connection

Preferably, the temperature control circuit includes a field effect transistor Q4, a resistor R14, a resistor R60, an operator U3A, a resistor R15, a capacitor C3, a capacitor C4, a resistor R16, and a resistor R17, one end of the resistor R15, one end of the resistor R16, and one end of the resistor R17 are all connected to an input terminal of the current limiting circuit, the other end of the resistor R16, one end of the capacitor C3, and one end of the resistor R60 are all connected to a positive input terminal of the operator U3A, the other end of the resistor R17, one end of the negative temperature coefficient resistor NTC1, and one end of the capacitor C4 are all connected to a negative input terminal of the operator U3A, the other end of the resistor R15 is connected to a power supply terminal of the operator U3A, an output terminal of the operator U3A is connected to a gate of the field effect transistor Q4 through the resistor R14, an inverting input terminal of the operator U1A and an inverting input terminal of the operator U1B are all connected to a drain of the field effect transistor Q4, and a source of the other end of the field effect transistor Q4, the other end of the capacitor C3, the other end of the resistor R60, the negative temperature coefficient resistor R1, and a negative input terminal of the negative temperature coefficient resistor R1 are all connected to ground.

Preferably, the current limiting circuit comprises a current limiting resistor RCS, one end of the current limiting resistor RCS is externally connected with a power supply, and the electronic switch is connected with the other end of the current limiting resistor RCS.

Compared with the prior art, the beneficial effects of the utility model reside in that: the working temperature of the electronic switch is detected through the resistor NTC1, and the resistance of the negative temperature coefficient resistor NTC1 is larger as the temperature of the electronic switch is higher, so that the temperature control circuit is driven to perform feedback control on the electronic switch, specifically, when the preset temperature is reached, the resistance of the resistor NTC1 is increased, the negative feedback of the arithmetic unit U3A is reversed, the arithmetic unit U1A and the arithmetic unit U1B in the OR arithmetic circuit are closed, the field effect transistor Q1 is turned off, and no output is generated in a load; specifically, the reference voltage of the operator U3A is 1V, when the resistance value of the resistor NTC1 becomes larger than 10K, then the voltage 1.2V at the reverse input end of the operator U3A is larger than the reference voltage 1V, so the operator U3A reverses and pulls down the voltage of the gate of the field-effect transistor Q4 (the field-effect transistor Q4 is an NMOS transistor) in a negative feedback manner, that is, the operator U3A outputs a low level to the gate of the field-effect transistor Q4 to drive the field-effect transistor Q4 to turn off, and then the operator U1A and the operator U1B are turned off, and at this time, the operator U1A and the operator U1B output a low level to the field-effect transistor Q1 together to drive the field-effect transistor Q1 to turn off, thereby protecting the whole circuit stably and avoiding damaging components.

Drawings

Fig. 1 is a circuit diagram of a control device for monitoring and protecting an electric device according to the present invention.

Fig. 2 is a circuit diagram of an or operation circuit according to the present invention.

Fig. 3 is a circuit diagram of the temperature control circuit according to the second embodiment.

Fig. 4 is a circuit diagram of the fault protection circuit described in the third embodiment.

Fig. 5 is a circuit diagram of the detection circuit according to the third embodiment.

Fig. 6 is a circuit diagram of the self-adjusting module according to the fourth embodiment.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention will be further described with reference to the accompanying drawings and specific embodiments:

in the present invention, the electronic switch may be a switch device controlled by an integrated circuit unit, or may be a field effect transistor functioning as a switch, preferably, the electronic switch at least includes an input end, an output end and a driving end for driving the input end and the output end to be in one of on and off states, the input end of the power supply or the operation circuit, the input end of the start self-adjusting module and the input end of the fault self-detecting module are all connected to the input end of the electronic switch, the input end of the or operation circuit, the input end of the fault self-detecting module and the power consumption device are all connected to the output end of the electronic switch, and the output end of the or operation circuit is connected to the driving end of the electronic switch; as shown in fig. 1, when electronic switch including be used for ordering about between power and the consumer be in the route and the one of them state of opening circuit field effect transistor Q1 (in the utility model discloses in, field effect transistor Q1 is the NMOS pipe), utilize field effect transistor Q1's on-state to realize being in the route and opening circuit one of them state between control power and the consumer, in the utility model discloses in, still including the current limiting circuit who is used for external power supply, utilize current limiting circuit to provide stable electric current to field effect transistor Q1, avoid field effect transistor Q1 to expose in the heavy current, reduce the probability that field effect transistor Q1 damaged, preferably, current limiting circuit includes current limiting resistor RCS, current limiting resistor RCS's one end external power supply, electronic switch is connected with current limiting resistor RCS the other end.

As shown in fig. 1-6, in the utility model discloses in, a control device of control protection consumer including be used for ordering about external consumer in the operation and close the output control module of one of them state, be used for monitoring output control module's operating temperature's temperature control protection module, be used for adjusting output control module output efficiency start from the adjustment module and be used for detecting the trouble self-detecting module of the voltage difference at output control module both ends, output control module is including connecting the electronic switch between power and consumer and being used for ordering about electronic switch to be in the closure and open circuit or the operational circuit of one of them state, or the input of operational circuit and the input that starts from the adjustment module all are connected with electronic switch, the trouble self-detecting module passes through temperature control protection module and is connected with or the operational circuit. Specifically, the voltage levels at the two ends of the source electrode and the drain electrode of the output field-effect tube Q1 are detected through an OR operation circuit, and then the voltage level comparison value is subjected to OR operation, so that the field-effect tube Q1 or an operation switch is controlled; when the FET Q1 is started, the self-adjusting module is started to adjust the starting time of the FET Q1 when detecting that the load current output by the current limiting circuit (current limiting resistor RCS) is greater than a first current preset value (for example, 20A) and greater than a second current preset value (for example, 35A), or the self-adjusting module is started to adjust the starting time of the FET Q1 when detecting that the current at the input end of the electronic switch is greater than the first current preset value (for example, 20A) and greater than the second current preset value (for example, 35A), thereby protecting the service life of the FET Q1; when the field effect transistor Q1 is switched on, the temperature control protection module measures the temperature of the field effect transistor Q1 in real time, and when the measured temperature reaches a pre-receiving temperature (for example, 100 ℃), the temperature control protection module generates negative feedback inversion to turn off the OR operation main control module, so that the whole circuit is protected to be stable, and components are prevented from being damaged; meanwhile, the fault self-detection module checks whether the output voltages at the two ends of the source electrode and the drain electrode of the field effect transistor Q1 are abnormal or not, and when the error of the voltages at the two ends exceeds a preset range, the fault self-detection module can automatically close the output of the field effect transistor Q1, so that the safety of the whole module is protected; therefore, redundant power supply control is realized, the circuit is monitored and protected in real time, when a fault occurs, hot plugging can be carried out, arc discharge is avoided, plug and play are realized, and the user can be effectively protected to safely use the low-voltage heavy-current electric equipment.

The first embodiment is as follows:

as shown in fig. 2, the electronic switch includes a field effect transistor Q1 for driving the power supply and the electric equipment to be in one of a closed state and an open state, a source of the field effect transistor Q1 is connected to an output terminal of the current limiting circuit, a drain of the source of the field effect transistor Q1 is connected to the electric equipment, preferably, the or operation circuit includes a first or operation circuit and a second or operation circuit, wherein a resistor R1 and a resistor R5 form a load protection circuit, a resistor R2, a resistor R3, a resistor R41, a diode D1, a capacitor C1 and an operator U1A form the first or operation circuit, a resistor R4, a resistor R13, a resistor R12, an operator U1B, a diode D3 and a capacitor C2 form the second or operation circuit, a source of the field effect transistor Q1 is connected to an input terminal of the first or operation circuit, a drain of the field effect transistor Q1 is connected to an input terminal of the second or operation circuit, and a gate of the first or operation circuit and a gate of the second or operation circuit are connected to the field effect transistor Q1 through the load protection circuit; specifically, the power end of the arithmetic unit U1A is connected to the power supply through a resistor R2, the power end of the arithmetic unit U1B is connected to the power supply through a resistor R4, one end of the resistor R3 is connected to the source electrode of the field-effect tube Q1, the other end of the resistor R3 and one end of the capacitor C1 are both connected to the forward input end of the arithmetic unit U1A, the output end of the arithmetic unit U1A is connected to one end of the resistor R41 through a diode D1, one end of the resistor R12 is connected to the drain electrode of the field-effect tube Q1, the other end of the resistor R12 and one end of the capacitor C2 are both connected to the forward input end of the transporter U1B, the output end of the transporter U1B is connected to one end of a resistor R13 through a diode D3, the other end of the resistor R41 and the other end of the resistor R13 are both connected to one end of a resistor R5, the other end of the resistor R5 and one end of the resistor R1 are both connected to the gate of the field-effect tube Q1, and the other end of the capacitor C1, the other end of the resistor R1, the reverse input end of the arithmetic unit U1 and the input end of the arithmetic unit U1 are both connected to the reverse input end of the ground. In this embodiment, the resistor R1 and the resistor R5 form a load protection, wherein the resistor R5 is used to control the conduction rate of the field effect transistor Q1, so as to avoid abnormal heating caused by the high voltage impact on the field effect transistor Q1; resistance R1 is as the bleeder resistance, the small amount of static between the grid of field effect transistor Q1 and the source electrode is released, prevent that field effect transistor Q1 from producing the malfunction, even puncture field effect transistor Q1 (because as long as there is a small amount of static just can make the equivalent capacitance between the grid of field effect transistor Q1 and the source electrode produce very high voltage), the effect of protection field effect transistor Q1 has been played, and provide bias voltage for field effect transistor Q1, furthermore, arithmetic unit U1A and arithmetic unit U1B detect field effect transistor Q1's source electrode and drain electrode both ends magnitude of voltage respectively and control field effect transistor Q1 or operation, can open field effect transistor Q1 and close field effect transistor Q1, wherein or the operation is like: 0/0=0,0/1=1,1/0=1,1/1=1, thus realize the redundant power control, has guaranteed the high availability of the electronic switch (field effect tube Q1), and realize the hot plug through the field effect tube Q1, do not discharge the arc in the course of pulling out and inserting, can realize plug and play, convenient maintenance and change the consumer.

Example two:

as shown in fig. 2-3, in this embodiment, the output control module includes a current limiting circuit for an external power supply and an electronic switch, the temperature control protection module includes a temperature control circuit and a negative temperature coefficient resistor NTC1 for obtaining a temperature of the electronic switch, an output terminal of the current limiting circuit is connected to an input terminal of the electronic switch, an output terminal of the electronic switch is connected to the power consumer, the negative temperature coefficient resistor NTC1 is connected to a driving terminal of the electronic switch through the temperature control circuit, preferably, the electronic switch includes a field effect transistor Q1 for driving the power supply and the power consumer to be in one of a closed state and an open state, the current limiting circuit includes a current limiting resistor RCS, a source of the field effect transistor Q1 is connected to the power supply through the current limiting resistor RCS, a drain of the source of the field effect transistor Q1 is connected to the power consumer, the negative temperature coefficient resistor NTC1 is connected to a gate of the field effect transistor Q1 through the temperature control circuit, further, the output control module further comprises an OR operation circuit, the OR operation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R13, a resistor R12, an operator U1A, an operator U1B, a diode D1, a diode D3, a capacitor C1 and a capacitor C2, the power supply end of the operator U1A is connected with the power supply through the resistor R2, the power supply end of the operator U1B is connected with the power supply through the resistor R4, one end of the resistor R3 is connected with the source electrode of the field effect tube Q1, the other end of the resistor R3 and one end of the capacitor C1 are both connected with the forward input end of the operator U1A, the output end of the operator U1A is connected with one end of the resistor R41 through the diode D1, one end of the resistor R12 is connected with the drain electrode of the field effect tube Q1, the other end of the resistor R12 and one end of the capacitor C2 are both connected with the forward input end of the transporter U1B, the output of conveyer U1B passes through diode D3 and is connected with resistance R13's one end, resistance R41's the other end and resistance R13's the other end all are connected with resistance R5's one end, resistance R5's the other end and resistance R1's one end all are connected with field effect transistor Q1's grid, electric capacity C1's the other end, electric capacity C2's the other end and resistance R1's the other end all ground connection, and arithmetic unit U1A's reverse input and arithmetic unit U1B's reverse input pass through temperature control circuit ground connection. In this embodiment, the arithmetic unit U1A and the arithmetic unit U1B respectively detect voltage values at two ends of a source and a drain of the field effect transistor Q1 to control the field effect transistor Q1 or perform arithmetic, the field effect transistor Q1 can be turned on and the field effect transistor Q1 can be turned off, preferably, the temperature control circuit includes a field effect transistor Q4, a resistor R14, a resistor R60, an arithmetic unit U3A, a resistor R15, a capacitor C3, a capacitor C4, a resistor R16, a resistor R17 and a resistor NTC1, one end of the resistor R15, one end of the resistor R16 and one end of the resistor R17 are all connected to a power supply, the other end of the resistor R16, one end of the capacitor C3 and one end of the resistor R60 are all connected to a forward input end of the arithmetic unit U3A, the other end of the resistor R17, one end of the resistor NTC1 and one end of the capacitor C4 are all connected to a reverse input end of the arithmetic unit U3A, the other end of the resistor R15 is connected to a drain of the arithmetic unit U3A gate, the output end of the arithmetic unit U3A is connected to a source of the field effect transistor Q4, the other end of the field effect transistor Q1 and the drain of the resistance R4 are connected to a drain of the arithmetic unit Q1 and the negative input end of the resistance R4. In this embodiment, the resistor NTC1 is a negative temperature coefficient resistor, and the resistance of the resistor has a linear relationship with the temperature, that is, the higher the temperature is, the larger the resistance is, for example, the type-selected NTC negative temperature coefficient resistor 10K, the resistance at the normal temperature of 25 degrees is 2K, the temperature is increased by 10 degrees to correspond to the resistance 1K, and the linear change is performed, and when the temperature is increased to 100 degrees to correspond to the resistance 12K, specifically, the resistor NTC1 is used for measuring the working temperature of the electronic switch (field effect transistor Q1); when the NTC1 detects that the working temperature of an electronic switch (a field effect transistor Q1) reaches a preset temperature, the resistance value of the NTC1 is increased, the arithmetic unit U3A performs negative feedback inversion, and the arithmetic unit U1A and the arithmetic unit U1B in the OR arithmetic circuit are closed, so that the field effect transistor Q1 is turned off, and no output is carried out on a load; specifically, the reference voltage of the operator U3A is 1V, when the resistance value of the resistor NTC1 becomes larger than 10K, then the voltage 1.2V at the reverse input end of the operator U3A is larger than the reference voltage 1V, so the operator U3A reverses and pulls down the voltage of the gate of the field-effect transistor Q4 (the field-effect transistor Q4 is an NMOS transistor) in a negative feedback manner, that is, the operator U3A outputs a low level to the gate of the field-effect transistor Q4 to drive the field-effect transistor Q4 to turn off, and then the operator U1A and the operator U1B are turned off, and at this time, the operator U1A and the operator U1B output a low level to the field-effect transistor Q1 together to drive the field-effect transistor Q1 to turn off, thereby protecting the whole circuit stably and avoiding damaging components.

EXAMPLE III

As shown in fig. 4-5, in this embodiment, the output control module includes a current limiting circuit for an external power supply and an electronic switch for connecting an external electrical device, the fault self-detection module includes a detection circuit and a fault protection circuit, an output terminal of the current limiting circuit and an output terminal of the electronic switch are both connected to an input terminal of the detection circuit, an output terminal of the detection circuit is connected to a driving terminal of the electronic switch through the fault protection circuit, preferably, the electronic switch includes a field effect transistor Q1 for driving the power supply and the electrical device to be in one of a closed state and an open state, the current limiting circuit includes a current limiting resistor RCS, one end of the current limiting resistor RCS is connected to the power supply, the other end of the current limiting resistor RCS and an input terminal of the detection circuit are both connected to the field effect transistor Q1, wherein the other end of the current limiting resistor RCS is connected to a source of the field effect transistor Q1, a source and a drain of the field effect transistor Q1 are both connected to an input terminal of the detection circuit, and an output terminal of the detection circuit is connected to a gate of the field effect transistor Q1 through the fault protection circuit; further, the output control module further comprises an or operation circuit, the or operation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R13, a resistor R12, an operator U1A, an operator U1B, a diode D1, a diode D3, a capacitor C1 and a capacitor C2, a power end of the operator U1A is connected with a power source through the resistor R2, a power end of the operator U1B is connected with the power source through the resistor R4, one end of the resistor R3 is connected with a source electrode of the field-effect tube Q1, the other end of the resistor R3 and one end of the capacitor C1 are both connected with a forward input end of the operator U1A, an output end of the operator U1A is connected with one end of the resistor R41 through the diode D1, one end of the resistor R12 is connected with a drain electrode of the field-effect tube Q1, the other ends of the resistor R12 and the capacitor C2 are both connected with a forward input end of the transporter U1B, the other end of the resistor R1 and one end of the capacitor R1 are both connected with a forward input end of the fault protection circuit, and the other end of the resistor R1, and the output end of the resistor R1 are both connected with a gate of the protection circuit, and the other end of the resistor R1 are both connected with the protection circuit, and the other end of the protection circuit are connected with the gate of the resistor R1, and the protection circuit, and the gate of the resistor R1 are connected with the other end of the protection circuit, and the gate of the protection circuit, and the protection circuit. In this embodiment, the arithmetic unit U1A and the arithmetic unit U1B respectively detect voltage values at two ends of the source and the drain of the field-effect transistor Q1 to control the field-effect transistor Q1 or perform arithmetic, and can turn on the field-effect transistor Q1 and turn off the field-effect transistor Q1.

Preferably, the fault protection circuit includes a field effect transistor Q4, a resistor R14, a resistor R60, an operator U3A, a resistor R15, a capacitor C3, a capacitor C4, a resistor R16, a resistor R17 and a resistor NTC1, one end of the resistor R15, one end of the resistor R16 and one end of the resistor R17 are all connected to an input terminal of the current limiting circuit, the other end of the resistor R16, one end of the capacitor C3 and one end of the resistor R60 are all connected to a forward input terminal of the operator U3A, the other end of the resistor R17, one end of the resistor NTC1 and one end of the capacitor C4 are all connected to an inverting input terminal of the operator U3A, the other end of the resistor R15 is connected to a power supply terminal of the operator U3A, an output terminal of the operator U3A is connected to a gate of the field effect transistor Q4 through the resistor R14, an inverting input terminal of the operator U1A and an inverting input terminal of the operator U1B are all connected to a drain of the field effect transistor Q4, a source of the other end of the field effect transistor Q4, the other end of the capacitor C3, the other end of the resistor R60 and the resistor NTC1 are all grounded; further, the detection circuit comprises a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R37, a resistor R38, a resistor R39, a resistor R40, a capacitor C10, a capacitor EC3, a capacitor C11, a capacitor C9, a field effect transistor Q5, an arithmetic unit U4A and an arithmetic unit U4B, wherein the driving end of the electronic switch is connected with one end of the resistor R33, the other end of the resistor R33, one end of the resistor R32 and one end of the capacitor C9 are all connected with the positive input end of the arithmetic unit U4A, the output end of the arithmetic unit U4A is connected with one end of the resistor R28, the power end of the arithmetic unit U4A is connected with the input end of the current limiting circuit through the resistor R31, the output end of the current limiting circuit is connected with one end of the resistor R34, the other end of the resistor R34, one end of the resistor R35 and one end of the capacitor C10 are all connected with the reverse input end of the arithmetic unit U4A, the output end of the current limiting circuit is connected with one end of a resistor R37, the other end of the resistor R37, one end of a resistor R40 and one end of a capacitor EC3 are all connected with the forward input end of an arithmetic unit U4B, the output end of the electronic switch is connected with one end of a resistor R38, the other end of the resistor R38, one end of a resistor R39 and one end of a capacitor C11 are all connected with the reverse input end of the arithmetic unit U4B, the power supply end of the arithmetic unit U4B is connected with the input end of the current limiting circuit through a resistor R30, the output end of the arithmetic unit U4B is connected with one end of a resistor R29, the other end of the resistor R28 and the other end of the resistor R29 are all connected with the grid electrode of a field-effect tube Q5, the source electrode of the field-effect tube Q5 is connected with the input end of the current limiting circuit through a resistor R27, the reverse input end of the arithmetic unit U3A, the reverse input end of the arithmetic unit U1A and the reverse input end of the arithmetic unit U1B are all connected with the drain electrode of the field-effect tube Q5, the other end of the resistor R32, the other end of the capacitor C9, the other end of the resistor R39, the other end of the capacitor C11, the other end of the resistor R35, the other end of the capacitor C10, the other end of the resistor R40 and the other end of the capacitor EC9 are all grounded. In this embodiment, the arithmetic unit U4A and the arithmetic unit U4B obtain voltages at two ends (source and drain) of the field effect transistor Q1, compare the voltages, and determine that an error of the voltages at two ends of the field effect transistor Q1 exceeds a predetermined range, such as 0.3V and 0.5V, when the arithmetic unit U4A and the arithmetic unit U4B detect that the voltage error at two ends of the source and drain of the field effect transistor Q1 is less than 0.5V, and the reference voltage of the arithmetic unit U4A and the arithmetic unit U4B is 0.5V, the arithmetic unit U4A and the arithmetic unit U4B are not turned over, that is, the on state of the field effect transistor Q1 is not affected by the fault self-detection module at this time; when the operator U4A and the operator U4B detect that the voltage error at the two ends of the source electrode and the drain electrode of the field effect transistor Q1 is 0.5V, the reference voltage of the operator U4A and the operator U4B is 0.5V, so that the operator U4A and the operator U4B overturn to drive the field effect transistor Q5 to be switched on, further drive the operator U3A in the fault protection circuit to reversely feed back and overturn to pull down the voltage of the grid electrode of the field effect transistor Q4 and drive the field effect transistor Q4 to be switched off, further close the operator U1A and the operator U1B in the or operation circuit, namely switch off the field effect transistor Q1, so as to realize the timely protection of the problem of the automatic voltage fault detection and not influence the normal work of other machines.

Example four:

in this embodiment, as shown in fig. 6, the output control module includes a current limiting circuit and an electronic switch, the start self-adjusting module includes a first detection circuit for obtaining a current at an output end of the current limiting circuit and a first adjusting circuit for adjusting a conduction efficiency of the electronic switch, an output end of the current limiting circuit is connected to an input end of the electronic switch, an output end of the electronic switch is connected to an electric device, an input end of the first detection circuit is connected to an input end of the electronic switch, and an output end of the first detection circuit is connected to a driving end of the electronic switch through the first adjusting circuit; preferably, the electronic switch comprises a field effect transistor Q1 for driving the power supply and the electric equipment to be in one of a connection state and a disconnection state, the current limiting circuit comprises a current limiting resistor RCS, the source electrode of the field effect transistor Q1 is connected with a power supply through the current limiting resistor RCS, the drain electrode of the source electrode of the field effect transistor Q1 is connected with electric equipment, and further, the output control module further comprises an OR operation circuit, the OR operation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R13, a resistor R12, an operator U1A, an operator U1B, a diode D1, a diode D3, a capacitor C1 and a capacitor C2, the power supply end of the arithmetic unit U1A is connected with a power supply through a resistor R2, the power supply end of the arithmetic unit U1B is connected with the power supply through a resistor R4, one end of the resistor R3 is connected with the source electrode of the field effect transistor Q1, the other end of the resistor R3 and one end of the capacitor C1 are both connected with the positive input end of the arithmetic unit U1A, the output end of the arithmetic unit U1A is connected with one end of a resistor R41 through a diode D1, one end of the resistor R12 is connected with the drain electrode of the field effect transistor Q1, the other end of the resistor R12 and one end of the capacitor C2 are both connected with the positive input end of the conveyer U1B, the output end of the transporter U1B is connected with one end of a resistor R13 through a diode D3, the other end of the resistor R41 and the other end of the resistor R13 are both connected with one end of the resistor R5, the other end of the resistor R5 and one end of the resistor R1 are both connected with the grid electrode of the field effect transistor Q1, the first adjusting circuit is connected with the resistor R5 in parallel, and the other end of the capacitor C1, the other end of the capacitor C2, the other end of the resistor R1, the reverse input end of the arithmetic unit U1A and the reverse input end of the arithmetic unit U1B are all grounded; in this embodiment, the arithmetic unit U1A and the arithmetic unit U1B respectively detect the voltage values at the two ends of the source and the drain of the field effect transistor Q1 to control the field effect transistor Q1 or perform arithmetic, and can turn on the field effect transistor Q1 and turn off the field effect transistor Q1.

Specifically, the first adjusting circuit comprises a resistor R6, a resistor R7, a resistor R8 and a field-effect transistor Q2, one end of the resistor R8 is connected with the output end of the first detecting circuit, one end of the resistor R7 and the other end of the resistor R8 are both connected with the gate of the field-effect transistor Q2, the other end of the resistor R7 and the source of the field-effect transistor Q2 are both connected with one end of the resistor R5, the drain of the field-effect transistor Q2 is connected with one end of the resistor R6, and the other end of the resistor R6 is connected with the other end of the resistor R5; preferably, the first detection circuit comprises a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C5, a capacitor C6 and an operator U2B, one end of the resistor R20 and one end of the resistor R21 are all connected to a power supply, the other end of the resistor R20, one end of the resistor R18 and one end of the capacitor C5 are all connected to a forward input end of the operator U2B, an output end of the current limiting circuit is connected to one end of the resistor R19, the other end of the resistor R19 and one end of the capacitor C6 are all connected to a reverse input end of the operator U2B, a power supply end of the operator U2B is connected to the other end of the resistor R21, an output end of the operator U2B is connected to one end of the resistor R8, and the other end of the resistor R18, the other end of the capacitor C5 and the other end of the capacitor C6 are all grounded; in this embodiment, the self-adjusting module is started to detect the current flowing through the resistor RCS (i.e., the current flowing into the fet Q1), wherein the reference voltage of the operator U2B is 1V, when the current flowing through the resistor RCS is greater than or equal to a first current preset value (e.g., 20A), that is, the operator U2B detects that the current of the resistor RCS is greater than or equal to 20A, then the voltage at the reverse input end of the operator U2B is 1.2V greater than the reference voltage 1V, so that the operator U2B turns over to drive the fet Q2 to turn on, wherein the fet Q2 is a PMOS transistor; when the field effect transistor Q2 is conducted, the resistor R5 is connected with the resistor R6 in parallel, the resistance value is reduced, or the driving current output by the arithmetic circuit is increased, so that the conduction time and the speed of the field effect transistor Q1 are improved.

Preferably, the device further comprises a second adjusting circuit, the second adjusting circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a field-effect transistor Q3, a capacitor C7, a capacitor C8 and an operator U2A, one end of the resistor R24 and one end of the resistor R22 are both connected to a power supply, a power supply end of the operator U2A is connected to the other end of the resistor R22, the other end of the resistor R24, one end of the capacitor C7 and one end of the resistor R23 are all connected to a forward input end of the operator U2A, one end of the resistor R25 is connected to a reverse input end of the operator U2B, the other end of the resistor R25, one end of the resistor R26 and one end of the capacitor C8 are all connected to a reverse input end of the operator U2A, an output end of the operator U2A is connected to one end of the resistor R11, the other end of the resistor R11 and one end of the resistor R10 are all connected to a gate of the field-effect transistor Q3, the source of the resistor R8 is connected to a drain of the resistor R9, and the other end of the resistor R9 is connected to the drain of the resistor R9; in this embodiment, the reference voltage of the operator U2A is 1V, when the current flowing through the resistor RCS is greater than or equal to a second current preset value (for example, 35A), the operator U2B detects that the resistance current of the RCS is greater than or equal to 35A, and then the voltage at the inverting input terminal of the operator U2B is 1.5V, that is, the voltage at the inverting input terminal of the operator U2A is 1.5V; after voltage division is carried out by the resistor R25 and the resistor R26, the voltage of the reverse input end of the arithmetic unit U2A is 1.2V which is larger than the reference voltage 1V of the arithmetic unit U2A, so that the field effect transistor Q3 is driven to be conducted by negative feedback inversion of the U2A operational amplifier circuit, wherein the field effect transistor Q3 is a PMOS (P-channel metal oxide semiconductor) transistor, when the field effect transistor Q3 is conducted, the three resistors R9 and R5 are connected with the resistor R6 in parallel, the resistance value is smaller, or the driving current output by the arithmetic circuit is larger, and the conducting time and the speed of the field effect transistor Q1 are further improved. When the current flowing through the resistor RCS is more than or equal to 20A, the arithmetic unit U2B detects that the current of the resistor RCS is more than or equal to 20A, and then the voltage of the reverse input end of the arithmetic unit U2B is 1.2V, namely the voltage of the reverse input end of the arithmetic unit U2A is equal to 1.2V; the voltage of the reverse input end of the arithmetic unit U2A obtained through the voltage division of the R25 and the R26 is 0.8V and is smaller than the reference voltage 1V of the U2A operational amplifier circuit, so that the negative feedback of the arithmetic unit U2A is stopped, the positive feedback is turned over, and the field effect transistor Q3 is driven to be turned off (not conducted).

Various other modifications and changes can be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims.

Claims (4)

1. The utility model provides a temperature detect switch real time monitoring protection device which characterized in that: including the control by temperature change protection module who is used for ordering about external consumer to be in the operation and close the output control module of one of them state and is used for monitoring output control module's operating temperature, output control module is including the current-limiting circuit and the electronic switch who are used for external power supply, control by temperature change protection module includes temperature control circuit and the negative temperature coefficient resistance NTC1 that is used for acquireing the electronic switch temperature, electronic switch includes input, output and is used for ordering about the drive end that input and output are in switch-on and one of them state, current-limiting circuit's output is connected with electronic switch's input, electronic switch's output and consumer are connected, negative temperature coefficient resistance NTC1 is connected with electronic switch's drive end through temperature control circuit.

2. The real-time monitoring and protecting device for the temperature controlled switch as claimed in claim 1, wherein: the output control module further comprises an OR operation circuit, the OR operation circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R13, a resistor R12, an operator U1A, an operator U1B, a diode D1, a diode D3, a capacitor C1 and a capacitor C2, a power supply end of the operator U1A is connected with a power supply through the resistor R2, a power supply end of the operator U1B is connected with the power supply through the resistor R4, one end of the resistor R3 is connected with an output end of the current limiting circuit, the other end of the resistor R3 and one end of the capacitor C1 are both connected with a forward input end of the operator U1A, an output end of the operator U1A is connected with one end of the resistor R41 through the diode D1, resistance R12's one end is connected with electronic switch's output, resistance R12's the other end and electric capacity C2's one end all are connected with conveyer U1B's forward input end, conveyer U1B's output passes through diode D3 and is connected with resistance R13's one end, resistance R41's the other end and resistance R13's the other end all are connected with resistance R5's one end, resistance R5's the other end and resistance R1's one end all are connected with electronic switch's drive end, electric capacity C1's the other end, electric capacity C2's the other end and resistance R1's the other end all ground connection, arithmetic unit U1A's reverse input end and arithmetic unit U1B's reverse input end pass through temperature control circuit ground connection.

3. The real-time monitoring and protecting device for the temperature controlled switch as claimed in claim 2, wherein: the temperature control circuit comprises a field effect transistor Q4, a resistor R14, a resistor R60, an operator U3A, a resistor R15, a capacitor C3, a capacitor C4, a resistor R16 and a resistor R17, one end of the resistor R15, one end of the resistor R16 and one end of the resistor R17 are all connected with the input end of the current limiting circuit, the other end of the resistor R16, one end of the capacitor C3 and one end of the resistor R60 are all connected with the forward input end of the operator U3A, the other end of the resistor R17, one end of a negative temperature coefficient resistor NTC1 and one end of the capacitor C4 are all connected with the reverse input end of the operator U3A, the other end of the resistor R15 is connected with the power end of the operator U3A, the output end of the operator U3A is connected with the grid of the field effect transistor Q4 through the resistor R14, the reverse input end of the operator U1A and the reverse input end of the operator U1B are all connected with the drain electrode of the field effect transistor Q4, and the source electrode of the field effect transistor Q4, the other end of the capacitor C3, the other end of the resistor R4, the other end of the resistor R60 and the negative temperature coefficient resistor R1 are all connected with the ground.

4. The real-time monitoring and protecting device for the temperature controlled switch as claimed in claim 1, wherein: the current limiting circuit comprises a current limiting resistor RCS, one end of the current limiting resistor RCS is externally connected with a power supply, and the electronic switch is connected with the other end of the current limiting resistor RCS.

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