CN219164209U - Quick protection circuit - Google Patents
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- CN219164209U CN219164209U CN202320087496.5U CN202320087496U CN219164209U CN 219164209 U CN219164209 U CN 219164209U CN 202320087496 U CN202320087496 U CN 202320087496U CN 219164209 U CN219164209 U CN 219164209U
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Abstract
The utility model discloses a rapid protection circuit, which comprises a current detection circuit, a voltage detection circuit, a switch protection circuit, a current signal processing circuit and a controller, wherein the current detection circuit is arranged on a loop of a power supply so as to detect the current of the power supply; the voltage detection circuit detects the voltage of a power supply; the switch protection circuit is arranged on a loop of the power supply; the current signal processing circuit is used for disconnecting and outputting the power supply through the switch protection circuit when detecting that the current on the loop of the power supply is abnormal; and when the controller detects that the voltage of the power supply is abnormal, the power supply is disconnected and output through the switch protection circuit. Therefore, under the action of the current signal processing circuit and/or the controller, the switch protection circuit can be used for conducting or disconnecting the power supply, so that the hardware and software dual rapid protection of a power supply loop is realized, and the use is more convenient compared with a fuse.
Description
Technical Field
The utility model relates to the technical field of overvoltage multi-current protection circuits, in particular to a rapid protection circuit.
Background
In the power supply process of the power supply, an overcurrent phenomenon is usually caused by short circuit, and when a large current appears in a power supply loop, the large current can generate high heat through a resistor, so that a fire problem can appear. Fire often causes serious personal death or property loss to society, and therefore, current detection is required for a power supply loop of a power supply. In addition, during the application process of the electronic device, the electronic device is generally damaged due to the impact of high-voltage electricity, and in the power supply process of the power supply, the overvoltage current needs to be cut off and output to be controlled.
In the prior art, a fuse protection circuit is mainly adopted to protect a power supply signal of a power supply. The fuse protection circuit is too long in fusing time, the condition that a rear-stage circuit cannot be protected easily occurs, the protection current value is fixed, and the fuse needs to be replaced after protection, so that the fuse protection circuit is relatively troublesome.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, an object of the present utility model is to propose a fast protection circuit.
To achieve the above object, an embodiment of the present utility model provides a fast protection circuit, including:
the current detection circuit is arranged on a loop of the power supply to detect the current of the power supply;
the voltage detection circuit is connected with the output end of the power supply so as to detect the voltage of the power supply;
the switch protection circuit is arranged on a loop of the power supply;
the current signal processing circuit is respectively connected with the current detection circuit and the switch protection circuit, so that when the current abnormality on the loop of the power supply is detected, the power supply is disconnected and output through the switch protection circuit;
and the controller is respectively connected with the voltage detection circuit and the switch protection circuit, so that when the voltage abnormality of the power supply is detected, the power supply is disconnected and output through the switch protection circuit.
Further, according to an embodiment of the present utility model, the fast protection circuit further includes: the alarm circuit is connected with the controller, and the current signal processing circuit is also connected with the controller so as to carry out alarm prompt through the alarm circuit when the controller detects that the current and/or the voltage of the power supply is abnormal; the alarm circuit includes:
the positive end of the buzzer is connected with a driving power supply;
the first triode Q1, the collecting electrode of first triode Q1 is connected with the negative terminal of buzzer, first triode Q1's projecting pole is connected with reference ground, first triode Q1's base is connected with a control end of controller through first resistance R4.
Further, according to an embodiment of the present utility model, the voltage detection circuit includes:
the second resistor R27, one end of the second resistor R27 is connected with the output end of the power supply, and the other end of the second resistor R27 is connected with a voltage detection end of the controller;
and one end of the third resistor R28 is connected with the other end of the second resistor R27, and the other end of the third resistor R28 is connected with the reference ground.
Further, according to an embodiment of the present utility model, the current detection circuit includes:
the power input end of the current detector is connected with the power supply input end, the power output end of the current detector is connected with the switch protection circuit, and the current detection output end of the current detector is connected with the current signal processing circuit.
Further, according to an embodiment of the present utility model, the current signal processing circuit includes:
the positive phase signal input end of the first integrated operational amplifier U2A is connected with the positive end of the current detection output end of the current detector through a fourth resistor R9, the inverted signal input end of the first integrated operational amplifier U2A is connected with the negative end of the current detection output end of the current detector through a fifth resistor R11, the non-inverted input end of the first integrated operational amplifier U2A is also connected with the reference ground through a sixth resistor R8 and a first capacitor C10 respectively, the inverted input end of the first integrated operational amplifier U2A is also connected with the output end of the first integrated operational amplifier U2A through a seventh resistor R12 and a second capacitor C14 respectively, the output end of the first integrated operational amplifier U2A is connected with one end of an eighth resistor R10, the other end of the eighth resistor R10 is connected with one end of a third capacitor C12, and the other end of the third capacitor C12 is connected with the reference ground;
the positive phase input end of the second integrated operational amplifier U2B is connected with the output end of the first integrated operational amplifier U2A through a ninth resistor R17 and an eighth resistor R10, the positive phase input end of the second integrated operational amplifier U2B is also connected with the output end of the second integrated operational amplifier U2B through a tenth resistor R23, the negative phase input end of the second integrated operational amplifier U2B is connected with the reference ground through an eleventh resistor R22, the negative phase input end of the second integrated operational amplifier U2B is also connected with the reference power supply through a twelfth resistor R19, the output end of the second integrated operational amplifier U2B is also connected with one end of a thirteenth resistor R18, and the other end of the thirteenth resistor R18 is respectively connected with the switch protection circuit and the controller so as to output an overcurrent protection signal to the switch protection circuit and the controller.
Further, according to an embodiment of the present utility model, the switch protection circuit includes:
the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the power output end of the current detector, the drain electrode of the MOS tube Q2 is connected with the power output interface, the grid electrode of the MOS tube Q2 is connected with one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is also connected with the source electrode of the MOS tube Q2 through a fifteenth resistor R13;
and the grid electrode of the MOS tube Q2 is also connected with the current detection circuit and the controller through the fourteenth resistor R14 and the switching tube driving circuit so as to drive the MOS tube Q2 to cut off under the protection signal effect of the current detection circuit and the controller.
Further, according to an embodiment of the present utility model, the switching tube driving circuit includes:
the collector of the first triode Q3 is connected with the grid electrode of the MOS tube Q2 through a fifteenth resistor R15 and a fourteenth resistor R14, the emitter of the first triode Q3 is connected with the reference ground, the base of the first triode Q3 is connected with a pull-up power supply through a sixteenth resistor R16 and a seventeenth resistor R30, and the base of the first triode Q3 is also connected with a control end of the controller through the sixteenth resistor R16.
Further, according to an embodiment of the present utility model, the switching tube driving circuit further includes:
and the collector of the second triode Q6 is connected with the base electrode of the first triode Q3, the emitter of the second triode Q6 is connected with the reference ground, and the base electrode of the second triode Q6 is connected with the overcurrent protection signal output end of the current signal processing circuit.
Further, according to an embodiment of the present utility model, the switching tube driving circuit includes:
and the collector of the third triode Q5 is connected with the base of the second triode Q6, the base of the second triode Q6 is also connected with the protection current signal detection end of the controller, the emitter of the third triode Q5 is connected with the reference ground, and the base of the third triode Q5 is connected with the overcurrent protection signal output end of the controller.
Further, according to an embodiment of the present utility model, the fast protection circuit further includes a power supply circuit, and the power supply circuit is respectively connected to the power supply output end, the controller, the current detection circuit, the voltage detection circuit, the current signal processing circuit and the alarm circuit, so as to supply power to the controller, the current detection circuit, the voltage detection circuit and the current signal processing circuit after the power supply is subjected to voltage conversion.
The rapid protection circuit provided by the embodiment of the utility model is arranged on a loop of a power supply through a current detection circuit so as to detect the current of the power supply; the voltage detection circuit is connected with the output end of the power supply so as to detect the voltage of the power supply; the switch protection circuit is arranged on a loop of the power supply; the current signal processing circuit is respectively connected with the current detection circuit and the switch protection circuit, so that when the current abnormality on the loop of the power supply is detected, the power supply is disconnected and output through the switch protection circuit; the controller is respectively connected with the voltage detection circuit and the switch protection circuit, so that when the voltage abnormality of the power supply is detected, the power supply is disconnected and output through the switch protection circuit. Therefore, under the action of the current signal processing circuit and/or the controller, the switch protection circuit can be used for conducting or disconnecting the power supply, so that the hardware and software dual rapid protection of a power supply loop is realized, and the use is more convenient compared with a fuse.
Drawings
Fig. 1 is a schematic diagram of a fast protection circuit according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a circuit structure of a controller according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of an alarm circuit according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a current detection circuit and a switch protection circuit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a current signal processing circuit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a voltage detection circuit and a power supply circuit according to an embodiment of the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to enable those skilled in the art to better understand the present utility model, the following description will make clear and complete descriptions of the technical solutions according to the embodiments of the present utility model with reference to the accompanying drawings. 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 utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, an embodiment of the present utility model provides a fast protection circuit, including: the switching protection circuit comprises a current detection circuit, a voltage detection circuit, a switching protection circuit, a current signal processing circuit and a controller; the current detection circuit is arranged on a loop of the power supply to detect the current of the power supply; specifically, as shown in fig. 5, the current detection circuit includes: the power supply input end of the current detector U3 is connected with the power supply input end, the power supply output end of the current detector U3 is connected with the switch protection circuit, and the current detection output end of the current detector U3 is connected with the current signal processing circuit. By arranging the current detector U3 on the supply loop of the power supply. Therefore, the current of the power supply loop of the power supply can be detected, a current detection signal is output to the current signal processing circuit, and overcurrent detection judgment is carried out through the circuit signal processing circuit so as to facilitate overcurrent protection.
The voltage detection circuit is connected with the output end of the power supply so as to detect the voltage of the power supply; specifically, as shown in fig. 6, the voltage detection circuit includes: the power supply device comprises a second resistor R27 and a third resistor R28, wherein one end of the second resistor R27 is connected with the power supply output end M_U+, and the other end of the second resistor R27 is connected with a voltage detection end of the controller; one end of the third resistor R28 is connected to the other end of the second resistor R27, and the other end of the third resistor R28 is connected to the ground. The voltage dividing circuit is formed by the second resistor R27 and the third resistor R28, and the output power voltage of the power supply output end M_U+ can be divided and then output to the voltage detection end of the controller U1 through the Vcheck signal end to be connected so as to carry out overvoltage protection through the controller U1.
The switch protection circuit is arranged on a loop of the power supply; as shown in fig. 4, the switch protection circuit includes: the MOS transistor Q2 and the switch transistor driving circuit, the source electrode of the MOS transistor Q2 is connected with the power output end of the current detector, the drain electrode of the MOS transistor Q2 is connected with the power output interface, the grid electrode of the MOS transistor Q2 is connected with one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is also connected with the source electrode of the MOS transistor Q2 through a fifteenth resistor R13; the grid electrode of the MOS tube Q2 is also connected with the current detection circuit and the controller through the fourteenth resistor R14 and the switching tube driving circuit, so that the MOS tube Q2 is driven to be cut off under the protection signal effect of the current detection circuit and the controller. Specifically, the MOS tube Q2 is disposed on a power supply loop of the power supply, and the MOS tube Q2 may be turned off under the action of an overcurrent or overvoltage protection signal, so as to cut off the power supply loop of the power supply, so as to control the power supply to provide output, and implement overcurrent and overvoltage protection of the power supply.
The current signal processing circuit is respectively connected with the current detection circuit and the switch protection circuit, so that when the current abnormality on the loop of the power supply is detected, the power supply is disconnected and output through the switch protection circuit; that is, the current signal processing circuit may compare and determine the current detection signal output by the current detection circuit, determine whether the current is excessive, and if the current is excessive, output an excessive current protection signal to the switch protection circuit, and cut off by controlling the MOS transistor Q2. Therefore, the over-current hardware protection can be realized, and the over-current hardware protection method has the characteristic of high speed. The power supply loop can be cut off in time when overcurrent occurs in the power supply loop. As shown in fig. 5, the current signal processing circuit includes: the positive phase signal input end of the first integrated operational amplifier U2A is connected with the positive end of the current detection output end of the current detector through a fourth resistor R9, the reverse phase signal input end of the first integrated operational amplifier U2A is connected with the negative end of the current detection output end of the current detector through a fifth resistor R11, the positive phase input end of the first integrated operational amplifier U2A is also connected with the ground through a sixth resistor R8 and a first capacitor C10 respectively, the reverse phase input end of the first integrated operational amplifier U2A is also connected with the output end of the first integrated operational amplifier U2A through a seventh resistor R12 and a second capacitor C14 respectively, the output end of the first integrated operational amplifier U2A is connected with one end of an eighth resistor R10, the other end of the eighth resistor R10 is connected with one end of a third capacitor C12, and the other end of the third capacitor C12 is connected with the ground.
Specifically, the first integrated operational amplifier U2A forms an isolation signal isolation operation circuit, and after isolating and operating the current detection signal of the current detector U3 through the uad+ and UAD-signal terminals, the current detection signal is output to the positive input terminal of the second integrated operational amplifier U2B through the IOUT signal.
The non-inverting input end of the second integrated operational amplifier U2B is connected with the output end of the first integrated operational amplifier U2A through a ninth resistor R17 and the eighth resistor R10, the non-inverting input end of the second integrated operational amplifier U2B is further connected with the output end of the second integrated operational amplifier U2B through a tenth resistor R23, the inverting input end of the second integrated operational amplifier U2B is connected with the reference ground through an eleventh resistor R22, the inverting input end of the second integrated operational amplifier U2B is further connected with the reference power supply through a twelfth resistor R19, the output end of the second integrated operational amplifier U2B is further connected with one end of a thirteenth resistor R18, and the other end of the thirteenth resistor R18 is respectively connected with the switch protection circuit and the controller so as to output an overcurrent protection signal to the switch protection circuit and the controller.
Specifically, the second integrated operational amplifier U2B constitutes a comparator that compares the current detection signal isolated and output by the first integrated operational amplifier U2A with a reference voltage, which is generated through a voltage divider constituted by a fourth resistor R9 and an eleventh resistor R22. And dividing the voltage of the reference power supply +5V and outputting the divided voltage to the reverse input end of the second integrated operational amplifier U2B. When the voltage value of the current detection signal isolated and output by the first integrated operational amplifier U2A is larger than the reference voltage, the second integrated operational amplifier U2B outputs a high-level overcurrent protection signal to the switching tube driving circuit through the ISTOP signal end, and the switching tube driving circuit drives the MOS tube Q2 to cut off, so that an output loop of a power supply is cut off, overcurrent hardware protection is realized, overcurrent quick response can be realized, and the output loop of the power supply is cut off quickly.
The controller is respectively connected with the voltage detection circuit and the switch protection circuit, so that when the voltage abnormality of the power supply is detected, the power supply is disconnected and output through the switch protection circuit. In addition to the overcurrent protection by detecting the current of the loop in a hardware manner, the controller can also detect the overcurrent protection signal through an ISTOP signal end and detect the overvoltage signal through a Vcheck signal end, and when the overcurrent or overvoltage of the power supply loop is detected, the controller can output the protection signal to the switch tube driving circuit through the PA2 and PC5 signal ends and disconnect the power supply through the switch protection circuit, as shown in fig. 2. Thereby realizing double protection of hardware and software.
The rapid protection circuit provided by the embodiment of the utility model is arranged on a loop of a power supply through a current detection circuit so as to detect the current of the power supply; the voltage detection circuit is connected with the output end of the power supply so as to detect the voltage of the power supply; the switch protection circuit is arranged on a loop of the power supply; the current signal processing circuit is respectively connected with the current detection circuit and the switch protection circuit, so that when the current abnormality on the loop of the power supply is detected, the power supply is disconnected and output through the switch protection circuit; the controller is respectively connected with the voltage detection circuit and the switch protection circuit, so that when the voltage abnormality of the power supply is detected, the power supply is disconnected and output through the switch protection circuit. Therefore, under the action of the current signal processing circuit and/or the controller, the switch protection circuit can be used for conducting or disconnecting the power supply, so that the hardware and software dual rapid protection of a power supply loop is realized, and the use is more convenient compared with a fuse.
Referring to fig. 1 and 3, the speed protection circuit further includes: the alarm circuit is connected with the controller, and the current signal processing circuit is also connected with the controller so as to carry out alarm prompt through the alarm circuit when the controller detects that the current and/or the voltage of the power supply is abnormal; the alarm circuit includes: the buzzer and the first triode Q1 are connected with a driving power supply at the positive end of the buzzer; the collector of the first triode Q1 is connected with the negative end of the buzzer, the emitter of the first triode Q1 is connected with the reference ground, and the base of the first triode Q1 is connected with a control end of the controller through a first resistor R4.
Specifically, as shown in fig. 3, when the controller U1 detects an overcurrent or overvoltage, the first transistor Q1 may be turned on by outputting a PA3 signal to the first transistor Q1. Thereby driving the buzzer to send out alarm sound signals so as to carry out overcurrent and overvoltage alarm prompt of the power supply. The alarm circuit can also comprise a plurality of LED lamps which can be turned on or off under the action of a control signal or a power signal of the controller U1. To indicate the operating state and the power state.
Referring to fig. 4, the switching tube driving circuit includes: the collector of the first triode Q3 is connected with the grid electrode of the MOS tube Q2 through a fifteenth resistor R15 and a fourteenth resistor R14, the emitter of the first triode Q3 is connected with the reference ground, the base of the first triode Q3 is connected with a pull-up power supply through a sixteenth resistor R16 and a seventeenth resistor R30, and the base of the first triode Q3 is also connected with a control end of the controller through the sixteenth resistor R16.
Specifically, the first triode Q3 may be used to perform fast on or off control on the MOS transistor Q2, and when the power supply loop generates overcurrent or overvoltage, the base of the first triode Q3 is pulled down to a low level under the action of an overcurrent or overvoltage signal, so that the first triode Q3 is turned off. At this time, the MOS transistor Q2 is also turned off, and the power supply circuit is turned off, so as to realize overcurrent and overvoltage protection. Under the normal power supply condition, the base electrode of the first triode Q3 is at a high level under the action of the power supply +3V.sub.3, so that the first triode Q3 is conducted, and meanwhile, the MOS tube Q2 is conducted. The power supply can normally output.
Referring to fig. 4, the switching tube driving circuit further includes: and the collector of the second triode Q6 is connected with the base electrode of the first triode Q3, the emitter of the second triode Q6 is connected with the reference ground, and the base electrode of the second triode Q6 is connected with the overcurrent protection signal output end of the current signal processing circuit.
Specifically, the over-current protection signal ISTOP of the current signal processing circuit is connected to the first transistor Q3 through the second transistor Q6, so as to control the first transistor Q3 to be turned on or off after the over-current protection signal ISTOP of the current signal processing circuit is converted. Specifically, when the current signal processing circuit detects that the power supply circuit is over-current, a high-level signal is output through the over-current protection signal ISTOP, and the second triode Q6 can be turned on by the high-level signal. Thereby, the first triode Q3 is pulled down to be in a low level, so that the first triode Q3 and the MOS tube Q2 are cut off.
Referring to fig. 4, the switching tube driving circuit includes: and the collector of the third triode Q5 is connected with the base of the second triode Q6, the base of the second triode Q6 is also connected with the protection current signal detection end of the controller, the emitter of the third triode Q5 is connected with the reference ground, and the base of the third triode Q5 is connected with the overcurrent protection signal output end of the controller.
Specifically, the over-current protection signal PA2 of the controller U1 is connected to the first transistor Q3 through the third transistor Q5, so as to control the first transistor Q3 to be turned on or off after the over-current protection signal PA2 of the controller U1 is converted. Specifically, when the controller U1 detects an overcurrent or overvoltage of the power supply circuit, a high-level signal is output through the overcurrent and overvoltage protection signal PA2, and the third triode Q5 is enabled to be turned on by the high-level signal. Thereby, the first triode Q3 is pulled down to be in a low level, so that the first triode Q3 and the MOS tube Q2 are cut off.
Referring to fig. 1 and 6, the fast protection circuit further includes a power supply circuit, which is respectively connected to the power supply output end, the controller, the current detection circuit, the voltage detection circuit, the current signal processing circuit and the alarm circuit, so as to supply power to the controller, the current detection circuit, the voltage detection circuit and the current signal processing circuit after the power supply is subjected to voltage conversion. Specifically, as shown in fig. 6, the power supply circuit includes a voltage conversion chip U4 and a voltage conversion chip U5, through which the power supply can be power-converted and then power is supplied to each circuit module. For example, it may be converted to a 5V or 3.3V power supply.
Although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the present utility model may be modified or equivalents substituted for some of the features thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.
Claims (10)
1. A fast protection circuit, comprising:
the current detection circuit is arranged on a loop of the power supply to detect the current of the power supply;
the voltage detection circuit is connected with the output end of the power supply so as to detect the voltage of the power supply;
the switch protection circuit is arranged on a loop of the power supply;
the current signal processing circuit is respectively connected with the current detection circuit and the switch protection circuit, so that when the current abnormality on the loop of the power supply is detected, the power supply is disconnected and output through the switch protection circuit;
and the controller is respectively connected with the voltage detection circuit and the switch protection circuit, so that when the voltage abnormality of the power supply is detected, the power supply is disconnected and output through the switch protection circuit.
2. The fast protection circuit of claim 1, further comprising: the alarm circuit is connected with the controller, and the current signal processing circuit is also connected with the controller so as to carry out alarm prompt through the alarm circuit when the controller detects that the current and/or the voltage of the power supply is abnormal;
the alarm circuit includes:
the positive end of the buzzer is connected with a driving power supply;
the device comprises a first triode (Q1), wherein a collector electrode of the first triode (Q1) is connected with a negative end of a buzzer, an emitter electrode of the first triode (Q1) is connected with a reference ground, and a base electrode of the first triode (Q1) is connected with a control end of a controller through a first resistor (R4).
3. The fast protection circuit of claim 1, wherein the voltage detection circuit comprises:
one end of the second resistor (R27) is connected with the output end of the power supply, and the other end of the second resistor (R27) is connected with a voltage detection end of the controller;
and one end of the third resistor (R28) is connected with the other end of the second resistor (R27), and the other end of the third resistor (R28) is connected with the reference ground.
4. The fast protection circuit of claim 1, wherein the current detection circuit comprises:
the power input end of the current detector is connected with the power supply input end, the power output end of the current detector is connected with the switch protection circuit, and the current detection output end of the current detector is connected with the current signal processing circuit.
5. The fast protection circuit of claim 4, wherein the current signal processing circuit comprises:
the positive phase input end of the first integrated operational amplifier (U2A) is connected with the positive end of the current detection output end of the current detector through a fourth resistor (R9), the inverted signal input end of the first integrated operational amplifier (U2A) is connected with the negative end of the current detection output end of the current detector through a fifth resistor (R11), the positive phase input end of the first integrated operational amplifier (U2A) is also connected with the reference ground through a sixth resistor (R8) and a first capacitor (C10) respectively, the inverted input end of the first integrated operational amplifier (U2A) is also connected with the output end of the first integrated operational amplifier (U2A) through a seventh resistor (R12) and a second capacitor (C14) respectively, the output end of the first integrated operational amplifier (U2A) is connected with one end of an eighth resistor (R10), the other end of the eighth resistor (R10) is connected with the third capacitor (C12) and the other end of the third capacitor (C12) is connected with the reference ground;
the positive input end of the second integrated operational amplifier (U2B) is connected with the output end of the first integrated operational amplifier (U2A) through a ninth resistor (R17) and an eighth resistor (R10), the positive input end of the second integrated operational amplifier (U2B) is also connected with the output end of the second integrated operational amplifier (U2B) through a tenth resistor (R23), the negative input end of the second integrated operational amplifier (U2B) is connected with the ground through an eleventh resistor (R22), the negative input end of the second integrated operational amplifier (U2B) is also connected with a reference power supply through a twelfth resistor (R19), the output end of the second integrated operational amplifier (U2B) is also connected with one end of a thirteenth resistor (R18), and the other end of the thirteenth resistor (R18) is respectively connected with the switch protection circuit and the controller so as to output an overcurrent protection signal to the switch protection circuit and the controller.
6. The fast protection circuit of claim 4, wherein the switch protection circuit comprises:
the MOS tube (Q2), the source electrode of the MOS tube (Q2) is connected with the power output end of the current detector, the drain electrode of the MOS tube (Q2) is connected with the power output interface, the grid electrode of the MOS tube (Q2) is connected with one end of a fourteenth resistor (R14), and the other end of the fourteenth resistor (R14) is connected with the source electrode of the MOS tube (Q2) through a fifteenth resistor (R13);
and the grid electrode of the MOS tube (Q2) is connected with the current detection circuit and the controller through the fourteenth resistor (R14) and the switching tube driving circuit, so that the MOS tube (Q2) is driven to be cut off under the protection signal action of the current detection circuit and the controller.
7. The fast protection circuit of claim 6, wherein the switching tube driving circuit comprises:
the MOS transistor comprises a first triode (Q3), wherein a collector of the first triode (Q3) is connected with a grid electrode of the MOS transistor (Q2) through a fifteenth resistor (R15) and a fourteenth resistor (R14), an emitter of the first triode (Q3) is connected with a reference ground, a base of the first triode (Q3) is connected with a pull-up power supply through a sixteenth resistor (R16) and a seventeenth resistor (R30), and the base of the first triode (Q3) is connected with a control end of the controller through the sixteenth resistor (R16).
8. The fast protection circuit of claim 7, wherein the switching tube driving circuit further comprises:
and the collector of the second triode (Q6) is connected with the base electrode of the first triode (Q3), the emitter of the second triode (Q6) is connected with the reference ground, and the base electrode of the second triode (Q6) is connected with the overcurrent protection signal output end of the current signal processing circuit.
9. The fast protection circuit of claim 8, wherein the switching tube driving circuit comprises:
the base of the second triode (Q6) is also connected with a protection current signal detection end of the controller, the emitter of the third triode (Q5) is connected with the reference ground, and the base of the third triode (Q5) is connected with an overcurrent protection signal output end of the controller.
10. The rapid protection circuit of claim 2, further comprising a power circuit, wherein the power circuit is respectively connected to the power supply output terminal, the controller, the current detection circuit, the voltage detection circuit, the current signal processing circuit and the alarm circuit, so as to supply power to the controller, the current detection circuit, the voltage detection circuit and the current signal processing circuit after the power supply is subjected to voltage conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320087496.5U CN219164209U (en) | 2023-01-30 | 2023-01-30 | Quick protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320087496.5U CN219164209U (en) | 2023-01-30 | 2023-01-30 | Quick protection circuit |
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| CN219164209U true CN219164209U (en) | 2023-06-09 |
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| CN202320087496.5U Active CN219164209U (en) | 2023-01-30 | 2023-01-30 | Quick protection circuit |
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