CN209963745U - Overcurrent self-locking driving circuit and system thereof - Google Patents
Overcurrent self-locking driving circuit and system thereof Download PDFInfo
- Publication number
- CN209963745U CN209963745U CN201920647696.5U CN201920647696U CN209963745U CN 209963745 U CN209963745 U CN 209963745U CN 201920647696 U CN201920647696 U CN 201920647696U CN 209963745 U CN209963745 U CN 209963745U
- Authority
- CN
- China
- Prior art keywords
- circuit
- motor
- switch circuit
- trigger
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
The application discloses an overcurrent self-locking driving circuit and a system, wherein the overcurrent self-locking driving circuit comprises a first switch circuit, a voltage division circuit and a trigger circuit, wherein the first end of the first switch circuit is used for being connected with a motor, the second end of the first switch circuit is connected with the first end of the voltage division circuit and the second end of the trigger circuit, and the second end of the voltage division circuit is connected with the first end of the trigger circuit; when the first switch circuit works in a conducting state, the overcurrent self-locking drive circuit supplies power to the motor, the current of the motor flows through the voltage division circuit through the first switch circuit, and when the first switch circuit works in a stopping state, the overcurrent self-locking drive circuit stops supplying power to the motor, and the current of the motor is not generated; when the current of the motor is greater than or equal to the preset current, the voltage division circuit provides trigger voltage for the trigger circuit; the trigger circuit generates a trigger signal for triggering the first switch circuit to work in an off state according to the trigger voltage. Through the mode, the motor can be automatically stopped to supply power to the motor when the motor is in a locked state or in an overcurrent state, and the safety is improved.
Description
Technical Field
The embodiment of the utility model provides a circuit protection technical field especially relates to an overflow auto-lock drive circuit and system thereof.
Background
At present, a driving circuit for driving a motor to work usually comprises a controller and a switch circuit, in the driving circuit, after the controller is powered on, the controller can control the switch circuit to work in a conducting state to supply power to the motor, but the controller cannot automatically power off after being powered on, and under the condition of no manual power off, the driving circuit can always supply power to the motor.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a main technical problem who solves provides an overflow auto-lock drive circuit and system thereof, overflow auto-lock drive circuit and can be when the motor stalling perhaps overflows the automatic shutdown for the motor power supply, avoid motor or drive circuit to damage, improve the security.
In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides an overcurrent self-locking drive circuit for be connected with the motor, overcurrent self-locking drive circuit includes first switch circuit, bleeder circuit and trigger circuit, wherein:
the first end of the first switch circuit is used for being connected with the motor, the second end of the first switch circuit is connected with the first end of the voltage division circuit, when the first switch circuit works in a conducting state, the overcurrent self-locking driving circuit supplies power to the motor, motor current generated by the motor flows through the voltage division circuit through the first switch circuit, when the first switch circuit works in a cut-off state, the overcurrent self-locking driving circuit stops supplying power to the motor, and the motor does not generate the motor current;
the second end of the voltage division circuit is connected with the first end of the trigger circuit, and the voltage division circuit is used for providing trigger voltage for the trigger circuit when the current of the motor is greater than or equal to preset current;
and the second end of the trigger circuit is connected with the second end of the first switch circuit, and the trigger circuit is used for generating a trigger signal for triggering the first switch circuit to work in a cut-off state according to the trigger voltage.
Optionally, the over-current self-locking driving circuit further includes:
the first end of the first switch circuit is connected with the motor through the clamping circuit, and the clamping circuit is used for clamping the input voltage of the motor.
Optionally, the trigger circuit comprises a second switching circuit and a third switching circuit, wherein:
the first end of the second switch circuit is connected with the second end of the voltage division circuit, the second end of the second switch circuit is connected with the first end of the third switch circuit, and the second switch circuit is used for working in a conducting state according to the trigger voltage and generating a low-level signal for triggering the third switch circuit to work in the conducting state;
and the second end of the third switch circuit is connected with the second end of the first switch circuit, and the third switch circuit is used for working in a conducting state according to the low-level signal and generating the trigger signal.
Optionally, the second switching circuit comprises: an NPN type triode;
and the base electrode and the collector electrode of the NPN type triode are respectively connected with the first end of the third switch circuit, the base electrode and the emitter electrode of the NPN type triode are respectively connected with the second end of the voltage division circuit, and the emitter electrode of the NPN type triode is grounded.
Optionally, the third switching circuit comprises: the PNP type triode, the first resistor and the controller;
a collector of the PNP type triode is connected with a base of the NPN type triode, a base of the PNP type triode is connected with the collector of the NPN type triode and one end of the first resistor, and an emitter of the PNP type triode is connected with the other end of the first resistor and a second end of the first switch circuit;
the controller is connected with an emitting electrode of the PNP type triode and used for outputting a high level signal.
Optionally, the third switching circuit further comprises: a second resistor and a third resistor;
the controller is connected with an emitting electrode of the PNP type triode through the second resistor;
one end of the third resistor is connected with the emitting electrode of the PNP type triode, and the other end of the third resistor is connected with the emitting electrode of the NPN type triode.
Optionally, the first switching circuit comprises: an NMOS transistor;
the source electrode of the NMOS transistor is connected with the first end of the voltage division circuit, the drain electrode of the NMOS transistor is connected with the clamping circuit, and the grid electrode of the NMOS transistor is connected with the emitting electrode of the PNP type triode.
Optionally, the voltage divider circuit includes: a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with the base electrode of the NPN type triode, the other end of the fourth resistor is connected with one end of the fifth resistor and the source electrode of the NMOS transistor, and the other end of the fifth resistor is connected with the emitting electrode of the NPN type triode.
Optionally, the clamp circuit comprises: a diode and a sixth resistor;
the diode is connected with the sixth resistor in parallel, the anode of the diode is connected with the drain electrode of the NMOS transistor, and the cathode of the diode is used for being connected with the motor.
For solving the technical problem, the utility model discloses a another technical scheme is: provided is an overcurrent self-locking driving system, comprising:
a motor; and
the overcurrent self-locking driving circuit is characterized in that;
the overcurrent self-locking driving circuit is connected with the motor through the first switch circuit and used for supplying power to the motor when the first switch circuit works in a conducting state and stopping supplying power to the motor when the first switch circuit works in a stopping state.
The embodiment of the utility model provides a beneficial effect is: different from the prior art, an embodiment of the present invention provides an overcurrent self-locking driving circuit and a system thereof, the overcurrent self-locking driving circuit includes a first switch circuit, a voltage dividing circuit and a trigger circuit, a first end of the first switch circuit is used for connecting to a motor, a second end of the first switch circuit is connected to a first end of the voltage dividing circuit, a second end of the voltage dividing circuit is connected to a first end of the trigger circuit, a second end of the trigger circuit is connected to a second end of the first switch circuit, when the first switch circuit works in an on state, the overcurrent self-locking driving circuit supplies power to the motor, a motor current generated by the motor flows through the voltage dividing circuit via the first switch circuit, when the motor current is greater than or equal to a preset current, the voltage dividing circuit provides a trigger voltage to the trigger circuit, the trigger circuit generates a trigger signal for triggering the first switch circuit to work in an off state according to the trigger voltage, the first switch circuit works in a cut-off state, at the moment, the overcurrent self-locking driving circuit stops supplying power to the motor, the motor does not generate motor current, namely the self-locking driving circuit can automatically stop supplying power to the motor when the motor current exceeds a threshold value, the motor or the driving circuit is effectively prevented from being damaged, and the safety is improved.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic diagram of an overcurrent self-locking driving system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an overcurrent self-locking driving system according to an embodiment of the present invention;
fig. 3 is a circuit connection diagram of an over-current self-locking driving system according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an overcurrent self-locking driving system according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of an overcurrent self-locking driving system according to another embodiment of the present invention;
fig. 6 is a circuit connection diagram of an overcurrent self-locking driving system according to another embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Please refer to fig. 1, which is a schematic diagram illustrating an over-current self-locking driving system according to an embodiment of the present invention, including: the motor 10 and the overcurrent self-locking driving circuit 20, overcurrent self-locking driving circuit 20 is connected with motor 10 for the power supply of motor 10 to driving motor 10 work, and when motor 10 stalls or overflows, the automatic shutdown supplies power for motor 10, prevents that motor 10 or circuit from damaging because of the electric current is too big, improves the security.
The motor 10 is an electromagnetic device that converts or transmits electric energy according to the law of electromagnetic induction, and is used to generate driving torque and provide power source for electrical appliances or various machines. The motor 10 is a direct current motor without a feedback pin, and can reduce cost.
Referring to fig. 2 and 3, the over-current self-locking driving circuit 20 includes: the motor driving circuit comprises an input power supply 21, a first switch circuit 22, a voltage division circuit 23 and a trigger circuit 24, wherein the input power supply 21 is connected with the positive pole of the motor 10, the first end of the first switch circuit 22 is connected with the negative pole of the motor 10, the second end of the first switch circuit 22 is connected with the first end of the voltage division circuit 23, the second end of the voltage division circuit 23 is connected with the first end of the trigger circuit 24, and the second end of the trigger circuit 24 is connected with the second end of the first switch circuit 22.
Wherein, the overcurrent self-locking driving circuit 20 determines whether to supply power to the motor 10 according to the working state of the first switch circuit 22. If the first switch circuit 22 works in a conducting state, the overcurrent self-locking drive circuit 20 supplies power to the motor 10; if the first switch circuit 22 is in the off state, the overcurrent self-locking driving circuit 20 stops supplying power to the motor 10.
The overcurrent self-locking driving circuit 20 supplies power to the motor 10 through the input power supply 21, and when the overcurrent self-locking driving circuit 20 supplies power to the motor 10, the voltage of the input power supply 21 is input to the motor 10; when the overcurrent self-locking driving circuit 20 stops supplying power to the motor 10, the voltage of the input power supply 21 is not input to the motor 10.
When the overcurrent self-locking driving circuit 20 supplies power to the motor 10, the motor current generated by the motor 10 passes through the first switch circuit 22; when the overcurrent self-locking drive circuit 20 stops supplying power to the motor 10, the motor 10 does not generate motor current.
Specifically, the first switch circuit 22 includes: the NMOS transistor Q1 and the NMOS transistor Q1 operate in an on state when a high level signal is detected and in an off state when a low level signal is detected.
The drain of the NMOS transistor Q1 is connected to the negative terminal of the motor 10, the source of the NMOS transistor Q1 is connected to the first terminal of the voltage divider circuit 23, and the gate of the NMOS transistor Q1 is connected to the second terminal of the trigger circuit 24.
When the first switch circuit 22 works in a conducting state, the motor current flows through the voltage division circuit 23 after passing through the first switch circuit 22, and at this time, if the motor current flowing through the voltage division circuit 23 is smaller than a preset current, it indicates that the motor 10 is not locked or overcurrent, and the voltage provided by the voltage division circuit 23 is not a trigger voltage; if the motor current flowing through the voltage divider 23 is greater than or equal to the predetermined current, it indicates that the motor 10 is locked or over-current, and the voltage divider 23 provides the trigger voltage to the trigger circuit 24. Wherein the preset current is less than or equal to the rated current of the motor 10.
Specifically, the voltage dividing circuit 23 includes: a fourth resistor R4 and a fifth resistor R5.
One end of the fourth resistor R4 is connected to the first end of the flip-flop 24, the other end of the fourth resistor R4 is connected to the node a, one end of the fifth resistor R5 is connected to the node a, the other end of the fifth resistor R5 is connected to the first end of the flip-flop 24, and the node a is connected to the source of the NMOS transistor Q1.
When the voltage divider 23 provides the trigger voltage, the trigger circuit 24 generates a trigger signal according to the trigger voltage, and the first switch circuit 22 is operated in the off state by the trigger signal; when the voltage divider 23 provides no trigger voltage, the trigger circuit 13 does not generate a trigger signal, and the first switch circuit 22 still operates in the on state.
The trigger circuit 24 includes: the second switch circuit 241 is connected to the third switch circuit 242, and the trigger circuit 24 is connected to the voltage divider circuit 23 through the second switch circuit 241 and connected to the first switch circuit 22 through the third switch circuit 242, that is, a first end of the second switch circuit 241 is connected to a second end of the voltage divider circuit 23, a second end of the second switch circuit 241 is connected to a first end of the third switch circuit 242, and a second end of the third switch circuit 242 is connected to a second end of the first switch circuit 22.
When the voltage divider 23 provides the trigger voltage, the second switch circuit 241 operates in an on state according to the trigger voltage and generates a low level signal, and the third switch circuit 242 operates in an on state according to the low level signal generated by the second switch circuit 241 and generates a low level trigger signal, and the first switch circuit 22 operates in an off state by the low level trigger signal.
When the voltage divider 23 supplies no trigger voltage, the second switch circuit 241 is turned off, and the third switch circuit 242 is also turned off, so that the trigger circuit 24 does not generate a low-level trigger signal, and the first switch circuit 22 is still turned on.
Specifically, the second switching circuit 241 includes: an NPN transistor Q2.
A base of the NPN transistor Q2 is connected to a node B, a collector of the NPN transistor Q2 is connected to the first end of the third switch circuit 242, an emitter of the NPN transistor Q2 is connected to the other end of the fifth resistor R5, an emitter of the NPN transistor Q2 is grounded, and the node B is connected to one end of the fourth resistor R4 and the first end of the third switch circuit 242. The voltage divider circuit 23 outputs a trigger voltage, which is a voltage for turning on the NPN transistor Q2, through the node B.
The third switching circuit 242 includes: PNP type triode Q3, first resistance R1 and controller.
The collector of the PNP triode Q3 is connected to the node B, the base of the PNP triode Q3 is connected to the collector of the NPN triode Q2 and one end of the first resistor R1, the emitter of the PNP triode Q3 is connected to the other end of the first resistor R1 and the gate of the NMOS transistor Q1, the emitter of the PNP triode Q3 is further connected to the controller, and the controller is configured to output a high level signal when the power is turned on.
Further, referring to fig. 4, in some other embodiments, the third switch circuit 242 further includes: a second resistor R2 and a third resistor R3.
One end of the second resistor R2 is connected with the controller, the other end of the second resistor R2 is connected with the emitter of the PNP type triode Q3, one end of the third resistor R3 is connected with the other end of the second resistor R2, and the other end of the third resistor R3 is connected with the emitter of the NPN type triode Q2. The second resistor R2 and the third resistor R3 can prevent the voltage input into the PNP type triode Q3 from being too large, and the trigger circuit 24 is protected.
It can be understood that, in the trigger circuit 24 of the embodiment of the present invention, when the voltage divider circuit 23 provides the trigger voltage, the trigger voltage is inputted to the base of the NPN type transistor Q2 through the node B, since the emitter of the NPN type transistor Q2 is grounded, the voltage between the base and the emitter of the NPN type transistor Q2 is the trigger voltage, since the trigger voltage is the voltage for turning on the NPN type transistor Q2, the emitter of the transistor Q2 is grounded, the base voltage of the transistor Q2 is higher than the emitter voltage, the condition for turning on the NPN type transistor Q2 is satisfied, so the NPN type transistor Q2 is turned on and operates in the on state, at this time, the collector and the emitter of the NPN type transistor Q2 are also turned on, so that the base of the PNP type transistor Q3 connected with the collector of the NPN type transistor Q2 is grounded, that the NPN type transistor Q2 generates the low level signal to input the base of the PNP type transistor Q3, since the emitter of the PNP type transistor Q3 is connected, the controller outputs a high-level signal when the power is on, so that an emitter of the PNP triode Q3 is at a high level, a base is at a low level, the conduction condition of the PNP triode Q3 is met, the PNP triode Q3 is conducted and works in a conduction state, the emitter of the PNP triode Q3 is grounded, the grid connected with the emitter of the NMOS transistor Q1 and the emitter of the PNP triode Q3 is grounded, namely the PNP triode Q3 generates a low-level trigger signal, and the low-level trigger signal is input to the grid of the NMOS transistor Q1 through the emitter of the PNP triode Q3, so that the NMOS transistor Q1 is turned off and works in a cut-off state;
when the voltage provided by the voltage divider circuit 23 is not the trigger voltage, the voltage input from the node B to the NPN transistor Q2 is not the trigger voltage, so that the voltage between the base and the emitter of the NPN transistor Q2 does not reach the voltage for turning on the NPN transistor Q2, the condition for turning on the NPN transistor Q2 is not satisfied, the NPN transistor Q2 cannot be turned on and operates in the off state, at this time, the base of the PNP transistor Q3 is pulled up to the emitter of the PNP transistor Q3 through the first resistor R1, the voltage between the base and the emitter of the PNP transistor Q3 cannot be determined, the condition for turning on the PNP transistor Q3 is not satisfied, so that the PNP transistor Q3 cannot be turned on and operates in the off state, at this time, the gate of the NMOS transistor Q1 is connected to the controller, the high-level signal output when the controller is powered on is input to the gate of the NMOS transistor Q1, that is, the trigger circuit 24 cannot generate the low-, the NMOS transistor Q1 is turned on by the high signal, and operates in the on state.
Specifically, in the embodiment of the present invention, when the overcurrent self-locking driving circuit 20 is connected to the motor 10, if the controller is not powered on, no signal is input to the NMOS transistor Q1, the NMOS transistor Q1 is in a cut-off state, the overcurrent self-locking driving circuit 20 cannot supply power to the motor 10, and the motor 10 does not generate a motor current;
when the controller is powered on, based on the condition that the motor 10 does not generate motor current at the last moment, the voltage dividing circuit 23 does not provide voltage, the NPN type triode Q2 and the PNP type triode Q3 both work in a cut-off state, a high level signal output by the controller is directly input into the NMOS transistor Q1, so that the NMOS transistor Q1 is turned on and works in a cut-on state, the overcurrent self-locking driving circuit 20 supplies power to the motor 10, the motor current generated by the motor 10 flows into the voltage dividing circuit 23 through the NMOS transistor Q1, if the motor current is less than a preset current, the voltage input from the node B to the NPN type triode Q2 is not a trigger voltage, the voltage between the base and the emitter of the NPN type triode Q2 does not reach the voltage for turning on the NPN type triode Q2, the condition for turning on the NPN type triode Q493q 2 is not satisfied, the NPN type triode Q2 cannot be turned on and works in a cut-off state, at this time, the voltage between the, the PNP type triode Q3 cannot be conducted and works in a cut-off state when the conduction condition of the PNP type triode Q3 is not met, so that a high level signal output by the controller is continuously input into the NMOS transistor Q1, the NMOS transistor Q1 keeps a conduction state, and the overcurrent self-locking driving circuit 20 continuously supplies power to the motor 10;
when the motor current flowing into the voltage divider circuit 23 is greater than or equal to the preset current, the voltage input from the node B to the NPN type triode Q2 is a trigger voltage, the voltage between the base and the emitter of the NPN type triode Q2 reaches a voltage that turns on the NPN type triode Q2, and satisfies the condition that the NPN type triode Q2 is turned on, the NPN type triode Q2 is turned on and operates in a conduction state, at this time, the collector and the emitter of the NPN type triode Q2 are turned on and grounded, so that the base of the PNP type triode Q3 connected to the collector of the NPN type triode Q2 is grounded, since the emitter of the PNP type triode Q3 is connected to the controller, the controller inputs a high level signal to the emitter of the PNP type triode Q3, the emitter of the PNP type triode Q3 is at a high level, the base is at a low level, the condition that the PNP type triode Q3 is turned on is satisfied, the PNP type triode Q3 is turned on and operates in, the PNP triode Q3 is grounded, generates a low-level trigger signal and inputs the low-level trigger signal into the NMOS transistor Q1, so that the NMOS transistor Q1 is turned off, and operates in a cut-off state, and the overcurrent self-locking driving circuit 20 stops supplying power to the motor 10, thereby preventing the motor or circuit from being damaged due to the fact that the current of the motor is greater than or equal to the preset current, and improving safety.
Further, referring to fig. 5 and fig. 6, in some other embodiments, the over-current self-locking driving circuit 20 further includes: one end of the clamp circuit 25 is connected to the input power supply 21, and the other end of the clamp circuit 25 is connected to the first end of the first switch circuit 22, that is, the clamp circuit 25 is connected in parallel to both ends of the motor 10. The clamp circuit 25 is used for clamping the input voltage of the motor 10 to prevent the motor 10 from being damaged due to the fact that the voltage input to the motor 10 is too large.
Specifically, the clamp circuit 25 includes: a diode and a sixth resistor R6.
The diode is connected in parallel with the sixth resistor R6, that is, the anode of the diode is connected to one end of the sixth resistor R6, the cathode of the diode is connected to the other end of the sixth resistor R6, the anode of the diode is connected to the drain of the NMOS transistor Q1 and the cathode of the electrode 10, and the cathode of the diode is connected to the input power supply and the anode of the electrode 10.
The embodiment of the utility model provides a beneficial effect is: different from the prior art, an embodiment of the present invention provides an overcurrent self-locking driving circuit and a system thereof, the overcurrent self-locking driving circuit includes a first switch circuit, a voltage dividing circuit and a trigger circuit, a first end of the first switch circuit is used for connecting to a motor, a second end of the first switch circuit is connected to a first end of the voltage dividing circuit, a second end of the voltage dividing circuit is connected to a first end of the trigger circuit, a second end of the trigger circuit is connected to a second end of the first switch circuit, when the first switch circuit works in an on state, the overcurrent self-locking driving circuit supplies power to the motor, a motor current generated by the motor flows through the voltage dividing circuit via the first switch circuit, when the motor current is greater than or equal to a preset current, the voltage dividing circuit provides a trigger voltage to the trigger circuit, the trigger circuit generates a trigger signal for triggering the first switch circuit to work in an off state according to the trigger voltage, the first switch circuit works in a cut-off state, at the moment, the overcurrent self-locking driving circuit stops supplying power to the motor, the motor does not generate motor current, namely the self-locking driving circuit can automatically stop supplying power to the motor when the motor current exceeds a threshold value, the motor or the driving circuit is effectively prevented from being damaged, and the safety is improved.
It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an overcurrent self-locking drive circuit for be connected with the motor, its characterized in that, overcurrent self-locking drive circuit includes first switch circuit, bleeder circuit and trigger circuit, wherein:
the first end of the first switch circuit is used for being connected with the motor, the second end of the first switch circuit is connected with the first end of the voltage division circuit, when the first switch circuit works in a conducting state, the overcurrent self-locking driving circuit supplies power to the motor, motor current generated by the motor flows through the voltage division circuit through the first switch circuit, when the first switch circuit works in a cut-off state, the overcurrent self-locking driving circuit stops supplying power to the motor, and the motor does not generate the motor current;
the second end of the voltage division circuit is connected with the first end of the trigger circuit, and the voltage division circuit is used for providing trigger voltage for the trigger circuit when the current of the motor is greater than or equal to preset current;
and the second end of the trigger circuit is connected with the second end of the first switch circuit, and the trigger circuit is used for generating a trigger signal for triggering the first switch circuit to work in a cut-off state according to the trigger voltage.
2. The over-current self-locking driving circuit according to claim 1, further comprising:
the first end of the first switch circuit is connected with the motor through the clamping circuit, and the clamping circuit is used for clamping the input voltage of the motor.
3. The over-current self-locking driving circuit according to claim 2, wherein the trigger circuit comprises a second switching circuit and a third switching circuit, wherein:
the first end of the second switch circuit is connected with the second end of the voltage division circuit, the second end of the second switch circuit is connected with the first end of the third switch circuit, and the second switch circuit is used for working in a conducting state according to the trigger voltage and generating a low-level signal for triggering the third switch circuit to work in the conducting state;
and the second end of the third switch circuit is connected with the second end of the first switch circuit, and the third switch circuit is used for working in a conducting state according to the low-level signal and generating the trigger signal.
4. The over-current self-locking driving circuit according to claim 3, wherein the second switching circuit comprises: an NPN type triode;
and the base electrode and the collector electrode of the NPN type triode are respectively connected with the first end of the third switch circuit, the base electrode and the emitter electrode of the NPN type triode are respectively connected with the second end of the voltage division circuit, and the emitter electrode of the NPN type triode is grounded.
5. The over-current self-locking driving circuit according to claim 4, wherein the third switching circuit comprises: the PNP type triode, the first resistor and the controller;
a collector of the PNP type triode is connected with a base of the NPN type triode, a base of the PNP type triode is connected with the collector of the NPN type triode and one end of the first resistor, and an emitter of the PNP type triode is connected with the other end of the first resistor and a second end of the first switch circuit;
the controller is connected with an emitting electrode of the PNP type triode and used for outputting a high level signal.
6. The over-current self-locking driving circuit according to claim 5, wherein the third switching circuit further comprises: a second resistor and a third resistor;
the controller is connected with an emitting electrode of the PNP type triode through the second resistor;
one end of the third resistor is connected with the emitting electrode of the PNP type triode, and the other end of the third resistor is connected with the emitting electrode of the NPN type triode.
7. The over-current self-locking driving circuit according to claim 5 or 6, wherein the first switching circuit comprises: an NMOS transistor;
the source electrode of the NMOS transistor is connected with the first end of the voltage division circuit, the drain electrode of the NMOS transistor is connected with the clamping circuit, and the grid electrode of the NMOS transistor is connected with the emitting electrode of the PNP type triode.
8. The over-current self-locking driving circuit according to claim 7, wherein the voltage dividing circuit comprises: a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with the base electrode of the NPN type triode, the other end of the fourth resistor is connected with one end of the fifth resistor and the source electrode of the NMOS transistor, and the other end of the fifth resistor is connected with the emitting electrode of the NPN type triode.
9. The over-current self-locking driving circuit according to claim 8, wherein the clamping circuit comprises: a diode and a sixth resistor;
the diode is connected with the sixth resistor in parallel, the anode of the diode is connected with the drain electrode of the NMOS transistor, and the cathode of the diode is used for being connected with the motor.
10. An overcurrent self-locking drive system, comprising:
a motor; and
the overcurrent self-locking drive circuit of any one of claims 1-9;
the overcurrent self-locking driving circuit is connected with the motor through the first switch circuit and used for supplying power to the motor when the first switch circuit works in a conducting state and stopping supplying power to the motor when the first switch circuit works in a stopping state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920647696.5U CN209963745U (en) | 2019-05-07 | 2019-05-07 | Overcurrent self-locking driving circuit and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920647696.5U CN209963745U (en) | 2019-05-07 | 2019-05-07 | Overcurrent self-locking driving circuit and system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209963745U true CN209963745U (en) | 2020-01-17 |
Family
ID=69244748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920647696.5U Active CN209963745U (en) | 2019-05-07 | 2019-05-07 | Overcurrent self-locking driving circuit and system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209963745U (en) |
Cited By (1)
| 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 |
-
2019
- 2019-05-07 CN CN201920647696.5U patent/CN209963745U/en active Active
Cited By (2)
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3150338B1 (en) | Electric tool, a motor assembly and motor drive system | |
| CN212323705U (en) | Input power protection circuit of automobile controller | |
| EP2844041A1 (en) | Power supply | |
| CN102780199A (en) | Overcurrent protection circuit and lamp | |
| CN209963745U (en) | Overcurrent self-locking driving circuit and system thereof | |
| CN109787596B (en) | Overcurrent protection circuit, switching tube driving circuit and electric equipment | |
| CN109347315B (en) | Power-on buffer circuit of power electronic device | |
| CN211266446U (en) | Circuit breaker protection device | |
| CN202231609U (en) | Current-limiting device and electric system | |
| CN214228118U (en) | Protection circuit of step-down power supply | |
| CN213661197U (en) | Short-circuit protection circuit based on Hall current sensor and voltage comparator | |
| CN211321011U (en) | Relay control circuit and electronic equipment | |
| CN212323715U (en) | Automatic protection circuit for input power supply of automobile controller | |
| CN204031110U (en) | Electronic DC switch and electronic equipment | |
| CN111367338B (en) | Self-resetting switching circuit based on feedback control and control method | |
| CN109524944B (en) | Protection circuit of direct current fan driver | |
| CN112510648A (en) | Short-circuit protection circuit based on Hall current sensor and voltage comparator | |
| CN112737287A (en) | Direct-current low-side driving switch circuit with short circuit and overload protection functions | |
| CN106856320A (en) | A kind of oil well terminal voltage protection circuit | |
| CN204851729U (en) | A PWM fan control circuit for refrigerator | |
| CN206323121U (en) | A kind of current-limiting protection circuit | |
| CN204633621U (en) | A kind of Switching Power Supply underloading turns off the circuit of synchronous rectification | |
| CN211480905U (en) | Short-circuit protection circuit, drive protection circuit and display device of display screen | |
| CN205141642U (en) | Brushless DC motor's protection circuit and controlling means | |
| CN216290687U (en) | Negative feedback voltage-stabilizing source circuit with self-locking function and household appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |