CN218603457U - Amplifier protection circuit - Google Patents
Amplifier protection circuit Download PDFInfo
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- CN218603457U CN218603457U CN202222502062.5U CN202222502062U CN218603457U CN 218603457 U CN218603457 U CN 218603457U CN 202222502062 U CN202222502062 U CN 202222502062U CN 218603457 U CN218603457 U CN 218603457U
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Abstract
The utility model provides an amplifier protection circuit, which comprises a MCU control circuit, a power supply circuit and an output circuit; the MCU control circuit comprises an MCU, a current detection module, a first on-off control module, a voltage detection module and a second on-off control module; the power supply circuit is connected with the first switch module, and the output circuit is connected with the second switch module. The MCU detects the current value and the voltage value of the amplifier in real time through the current detection module and the voltage detection module, and calculates and judges according to a preset threshold value. When the current or the voltage exceeds a preset threshold value, the MCU outputs a low level to the control end of the first on-off control module so as to cut off the first on-off control module, and therefore the first switch module is cut off. The MCU outputs a low level to the control end of the second on-off control module to cut off the second on-off control module, so that the second switch module is switched off, and the protection purpose is achieved.
Description
Technical Field
The utility model relates to a circuit design technical field especially relates to an amplifier protection circuit.
Background
The protection circuit is commonly used in various power amplifiers to protect loads such as a horn from damage caused by overcurrent, overvoltage or continuous output direct current.
In the prior art, detection of overcurrent, overvoltage and even direct current is generally performed by using a semiconductor device. When the current or the voltage does not reach a set value, the semiconductor device is cut off, and the protection circuit is closed; when the current or voltage reaches a set value, the semiconductor device is turned on, and the protection circuit operates. However, due to individual differences of semiconductor devices and the critical state that may exist when the semiconductor devices are close to being turned on, the protection circuit has an unstable working area at the triggering edge, and the instability affects the triggering precision and the amplifier performance.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an amplifier output protection circuit to the problem of solving the damage that brings based on the direct current that overflows, excessive pressure or last output, simultaneously the utility model discloses abandoned original semiconductor device and detected, changed to MCU and detected.
In order to solve the technical problem, the utility model discloses a so realize:
the embodiment of the utility model provides an amplifier protection circuit, amplifier protection circuit includes: the MCU control circuit, the power supply circuit and the output circuit;
the MCU control circuit comprises an MCU, a current detection module, a first on-off control module, a voltage detection module and a second on-off control module, wherein the MCU is respectively and electrically connected with the current detection module, the first on-off control module, the voltage detection module and the second on-off control module;
the power supply circuit comprises a power supply circuit, a current detection module, a first switch module, a first on-off control module and a second on-off control module, wherein the first switch module is connected between the input end and the output end of the power supply circuit;
the voltage detection module is connected with the output end of the amplifier, and the second on-off control module is used for controlling the on-off of the second switch module.
The utility model discloses further set up to: the power supply circuit comprises a first resistor, and the first on-off control module comprises a second resistor, a third resistor and a first switch unit;
the first resistor is arranged between the input end of the power supply circuit and the second resistor; one end of the second resistor is connected with the control end of the first switch module, the other end of the second resistor is connected with the input end of the first switch unit, the control end of the first switch unit is connected with the MCU through the third resistor, and the output end of the first switch unit is grounded.
The utility model discloses further set up to: the current detection module comprises a current front detection unit and a current rear detection unit, the current front detection unit is connected with the output end of the first switch module, the current front detection unit is provided with a fourth resistor with the output end of the power supply circuit, and the current rear detection unit is connected with the output end of the power supply circuit.
The utility model discloses further set up to: the current pre-detection unit comprises a fifth resistor and a sixth resistor; one end of the fifth resistor is connected with the output end of the first switch module, the other end of the fifth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is grounded, and the MCU is connected between the fifth resistor and the sixth resistor.
The utility model discloses further set up to: the current front detection unit comprises a seventh resistor and an eighth resistor; one end of the seventh resistor is connected with the output end of the power supply circuit, the other end of the seventh resistor is connected with one end of the eighth resistor, the other end of the eighth resistor is grounded, and the MCU is connected between the seventh resistor and the eighth resistor.
The utility model discloses further set up to: the first switching module includes a first transistor, the first switching unit includes a second transistor, and a type of the first transistor is different from or the same as a type of the second transistor.
The utility model discloses further set up to: the voltage detection module comprises a ninth resistor and a tenth resistor; one end of the ninth resistor is connected with the input end of the output circuit, the other end of the ninth resistor is connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, and the MCU is connected between the ninth resistor and the tenth resistor.
The utility model discloses further set up to: the second switch module comprises a relay, and the second on-off control module comprises a second switch unit and an eleventh resistor;
the first end of the relay is connected with the input end of the second switch module, the second end of the relay is connected with the output end of the second switch module, the third end of the relay is connected with the input end of the second switch unit, the MCU is connected with the control end of the second switch unit through the eleventh resistor, and the output end of the second switch unit is grounded.
The utility model discloses further set up to: the second switching unit includes a third transistor.
The utility model discloses further set up to: the output circuit further comprises a relay power supply module, and the relay power supply module is electrically connected with the fourth end of the relay.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides an amplifier protection, MCU are connected with current detection module, first break-make control module, voltage detection module and second break-make control module electricity respectively. The MCU detects the current value and the voltage value of the amplifier in real time through the current detection module and the voltage detection module, and calculates and judges according to a preset threshold value. When the current or the voltage exceeds a preset threshold value, the MCU outputs a low level to the control end of the first on-off control module so as to cut off the first on-off control module, so that the first switch module is cut off, and the main power supply is cut off at the moment, so that the damage caused by overvoltage or overcurrent is avoided, and the protection purpose is achieved. Meanwhile, when the current or the voltage exceeds a preset threshold value, the MCU outputs a low level to the control end of the second on-off control module so as to cut off the second on-off control module, so that the second switch module is switched off, and the load is cut off to achieve the protection purpose.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an amplifier protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an embodiment of an amplifier protection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an embodiment of an amplifier protection circuit according to an embodiment of the present invention;
in the figure: 1. an MCU control circuit; 11. a current detection module; 111. a current front detection unit; 112. a current post detection unit; 12. a first on-off control module; 121. a first switch unit; 13. a voltage detection module; 14. a second on-off control module; 141. a second switching unit; 2. a power supply circuit; 21. a first switch module; 3. an output circuit; 31. a second switch module; A. an input terminal of a power supply circuit; B. an output terminal of the power supply circuit; C. the control end of the first on-off control module; D. detecting a current front detection point; E. detecting a current rear point; G. the control end of the second on-off control module; H. an input terminal of an amplifier; K. an input terminal of an output circuit; l, a relay power supply module; m, an output end of the output circuit; j1, a relay, Q1 and a first transistor; q2, a second transistor; q3, a third transistor; r1 and a first resistor; r2 and a second resistor; r3, a third resistor; r4, a fourth resistor; r5 and a fifth resistor; r6 and a sixth resistor; r7 and a seventh resistor; r8 and an eighth resistor; r9 and a ninth resistor; r10, tenth resistance; r11, eleventh resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the present invention provides an amplifier protection circuit, please refer to fig. 1 to 3, wherein the amplifier protection circuit includes an MCU control circuit 1, a power supply circuit 2 and an output circuit 3; the MCU control circuit 1 comprises an MCU (not shown in the figure), a current detection module 11, a first on-off control module 12, a voltage detection module 13 and a second on-off control module 14, wherein the MCU is respectively and electrically connected with the current detection module 11, the first on-off control module 12, the voltage detection module 13 and the second on-off control module 14; a first switch module 21 is connected between an input end a and an output end B of the power supply circuit, the current detection module 11 is connected to an output end of the first switch module 21, the output end B of the power supply circuit is connected to a power supply end of the amplifier, and the first on-off control module 12 is configured to control on-off of the first switch module 21; a second switch module 31 is connected between an input end K and an output end M of the output circuit, the input end K of the output circuit is connected with the output end of the amplifier, the voltage detection module 13 is connected with the output end of the amplifier, and the second on-off control module 14 is used for controlling the on-off of the second switch module 31.
Specifically, the current detection module 11, the first on-off control module 12, the voltage detection module 13, and the second on-off control module 14 are respectively connected to different IO ports of the MCU. The current detection module 11 is used for detecting the total current of the amplifier; the first switching module 21 corresponds to an amplifier supply switch; the voltage detection module 13 is used for detecting the output voltage of the amplifier; the second switching module 31 corresponds to an amplifier output switch; the output end M of the output circuit is connected with the load of the amplifier.
The working principle of the embodiment is as follows: as shown in fig. 2, in normal state, the MCU outputs a high level to the control terminal C of the first on-off control module 12 to turn on the first on-off control module 12, so as to turn on the first switch module 21; current flows from the input a of the supply circuit to the output B of the supply circuit, at which point the amplifier starts to operate. Meanwhile, the MCU calculates the total operating current of the amplifier through the current detection module 11. The input end K of the output circuit is connected with the MCU through the voltage detection module 13, the MCU calculates the voltage value of the input end K of the output circuit, at the moment, the MCU grasps the real-time voltage value and the real-time current value at the same time, and calculates and judges according to a preset threshold value. When the current or the voltage exceeds a preset threshold value, the MCU outputs a low level to the control terminal C of the first on-off control module 12 to cut off the first on-off control module 12, so that the first switch module 21 is cut off, and the main power is cut off, thereby preventing damage due to overvoltage or overcurrent, and achieving the protection purpose. Meanwhile, as shown in fig. 3, in a normal state, the MCU outputs a high level to the control terminal G of the second on/off control module 14 to turn on the second on/off control module 14, so as to turn on the second switch module 31; when the current or the voltage exceeds a preset threshold, the MCU outputs a low level to the control terminal G of the second on/off control module 14 to turn off the second on/off control module 14, so that the second switch module 31 is turned off to cut off the load for protection.
In a specific embodiment, referring to fig. 2, the power supply circuit 2 includes a first resistor R1, and the first on-off control module 12 includes a second resistor R2, a third resistor R3, and a first switch unit 121; the first resistor R1 is arranged between the input end A of the power supply circuit and the second resistor R2; one end of the second resistor R2 is connected to the control end of the first switch module 21, the other end of the second resistor R2 is connected to the input end of the first switch unit 121, the control end of the first switch unit 121 is connected to the MCU through the third resistor R3, and the output end of the first switch unit 121 is grounded.
Specifically, the first resistor R1 divides the voltage to make the current at the input terminal a of the power supply circuit flow to the first on-off control module 12. The second resistor R2 and the third resistor R3 enable the first on-off control module 12 to be connected to the first switch module 21 through voltage division when the first on-off control module is switched into a high level. The first switch unit 121 is a switch for controlling the on/off of the first switch module 21.
In one embodiment, please refer to fig. 2, the current detecting module 11 includes a current front detecting unit 111 and a current rear detecting unit 112, the current front detecting unit 111 is connected to the output end of the first switch module 21, a fourth resistor R4 is disposed between the current front detecting unit 111 and the output end B of the power supply circuit, and the current rear detecting unit 112 is connected to the output end B of the power supply circuit. The pre-current detection unit 111 includes a fifth resistor R5 and a sixth resistor R6; one end of the fifth resistor R5 is connected with the output end of the first switch module 21, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is grounded, and the MCU is connected between the fifth resistor R5 and the sixth resistor R6. The current pre-detection unit 111 includes a seventh resistor R7 and an eighth resistor R8; one end of the seventh resistor R7 is connected with the output end B of the power supply circuit, the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is grounded, and the MCU is connected between the seventh resistor R7 and the eighth resistor R8.
Specifically, as shown in fig. 2, the current front detection unit 111 includes an amplifier total current front detection point D, the amplifier total current front detection point D is disposed between the fifth resistor R5 and the sixth resistor R6, and the amplifier total current front detection point D is connected to an IO port of the MCU; the current post-detection unit 112 includes an amplifier total current post-detection point E, the amplifier total current post-detection point E is disposed between the sixth resistor R6 and the seventh resistor R7, and the amplifier total current post-detection point E is connected to an IO port of the MCU. The value of the fourth resistor R4 is low, so that the influence of current on the internal resistance of the power supply is reduced. The fifth resistor R5 and the sixth resistor R6 enable the voltage range of the current front detection point E to be within the MCU working voltage range through voltage division so as to accurately detect. The seventh resistor R7 and the eighth resistor R8 enable the voltage range of the current post-detection point E to be within the MCU working voltage range through voltage division so as to accurately detect.
In a certain embodiment, the first switch module 21 includes a first transistor Q1, the first switch unit 121 includes a second transistor Q2, and the type of the first transistor Q1 is different from or the same as that of the second transistor Q2.
Specifically, in the present embodiment, the first transistor Q1 is a field effect transistor, and the second transistor Q2 is a triode. Of course, the types of the first transistor Q1 and the second transistor Q2 may also be other electronic devices, and are not limited herein.
In one embodiment, referring to fig. 3, the voltage detection module 13 includes a ninth resistor R9 and a tenth resistor R10; one end of the ninth resistor R9 is connected with the input end of the output circuit 3, the other end of the ninth resistor R9 is connected with one end of the tenth resistor R10, the other end of the tenth resistor R10 is grounded, and the MCU is connected between the ninth resistor R9 and the tenth resistor R10.
Specifically, the output terminal of the amplifier is divided by the ninth resistor R9 and the tenth resistor R10, and the voltage value of the output terminal of the amplifier is calculated in a voltage division manner.
In one embodiment, referring to fig. 3, the second switch module 31 includes a relay J1, and the second on-off control module 14 includes a second switch unit 141 and an eleventh resistor R11;
the first end of the relay J1 is connected to the input end of the second switch module 31, the second end is connected to the output end of the second switch module 31, the third end is connected to the input end of the second switch unit 141, the MCU is connected to the control end of the second switch unit 141 through the eleventh resistor R11, and the output end of the second switch unit 141 is grounded.
Specifically, the relay J1 is connected between the output terminal of the amplifier circuit and the output interface of the actual product, and switching off it is equivalent to switching off the output. In addition, when the MCU outputs a low level to the control terminal G of the second on/off control module 14, the second on/off control module 14 is turned off, so that the relay J1 is turned off, thereby cutting off the load to achieve the protection purpose.
In one embodiment, the second switching unit 141 includes a third transistor Q3.
Specifically, the third transistor Q3 is a triode. Of course, the type of the third transistor Q3 may also be other electronic devices, and is not limited herein.
In a specific embodiment, the output circuit 3 further includes a relay power supply module L, and the relay power supply module L is electrically connected to the fourth terminal of the relay J1. The relay power supply module L supplies power to the relay J1.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides an amplifier protection circuit, MCU are connected with current detection module 11, first break-make control module 12, voltage detection module 13 and the 14 electricity of second break-make control module respectively. The MCU detects the current value and the voltage value of the amplifier in real time through the current detection module 11 and the voltage detection module 13, and calculates and judges according to a preset threshold value. When the current or the voltage exceeds a preset threshold value, and when the current or the voltage exceeds the preset threshold value, the MCU outputs a low level to the control terminal C of the first on-off control module 12 to cut off the first on-off control module 12, so that the first switch module 21 is cut off, and at this time, the main power is cut off, thereby avoiding damage caused by overvoltage or overcurrent, and further achieving the protection purpose. Meanwhile, as shown in fig. 3, in a normal state, the MCU outputs a high level to the control end G of the second on/off control module 14 to turn on the second on/off control module 14, so that the second switch module 31 is turned on; when the current or the voltage exceeds a preset threshold, the MCU outputs a low level to the control terminal G of the second on/off control module 14 to turn off the second on/off control module 14, so that the second switch module 31 is turned off to cut off the load for protection.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. An amplifier protection circuit, comprising: the MCU control circuit, the power supply circuit and the output circuit;
the MCU control circuit comprises an MCU, a current detection module, a first on-off control module, a voltage detection module and a second on-off control module, wherein the MCU is respectively and electrically connected with the current detection module, the first on-off control module, the voltage detection module and the second on-off control module;
the power supply circuit comprises a power supply circuit, a current detection module, an amplifier, a first switch module, a first on-off control module and a second on-off control module, wherein the first switch module is connected between the input end and the output end of the power supply circuit;
the voltage detection module is connected with the output end of the amplifier, and the second on-off control module is used for controlling the on-off of the second switch module.
2. The amplifier protection circuit according to claim 1, wherein the power supply circuit comprises a first resistor, and the first on-off control module comprises a second resistor, a third resistor and a first switch unit;
the first resistor is arranged between the input end of the power supply circuit and the second resistor; one end of the second resistor is connected with the control end of the first switch module, the other end of the second resistor is connected with the input end of the first switch unit, the control end of the first switch unit is connected with the MCU through the third resistor, and the output end of the first switch unit is grounded.
3. The amplifier protection circuit according to claim 1, wherein the current detection module includes a pre-current detection unit and a post-current detection unit, the pre-current detection unit is connected to the output terminal of the first switch module, a fourth resistor is disposed between the pre-current detection unit and the output terminal of the power supply circuit, and the post-current detection unit is connected to the output terminal of the power supply circuit.
4. The amplifier protection circuit of claim 3, wherein the pre-current detection unit comprises a fifth resistor and a sixth resistor; one end of the fifth resistor is connected with the output end of the first switch module, the other end of the fifth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is grounded, and the MCU is connected between the fifth resistor and the sixth resistor.
5. The amplifier protection circuit of claim 3, wherein the pre-current detection unit comprises a seventh resistor and an eighth resistor; one end of the seventh resistor is connected with the output end of the power supply circuit, the other end of the seventh resistor is connected with one end of the eighth resistor, the other end of the eighth resistor is grounded, and the MCU is connected between the seventh resistor and the eighth resistor.
6. The amplifier protection circuit of claim 2, wherein the first switch module comprises a first transistor, the first switch unit comprises a second transistor, and the type of the first transistor is different from or the same as the type of the second transistor.
7. The amplifier protection circuit of claim 1, wherein the voltage detection module comprises a ninth resistor and a tenth resistor; one end of the ninth resistor is connected with the input end of the output circuit, the other end of the ninth resistor is connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, and the MCU is connected between the ninth resistor and the tenth resistor.
8. The amplifier protection circuit according to claim 1, wherein the second switch module comprises a relay, and the second switching control module comprises a second switch unit and an eleventh resistor;
the first end of the relay is connected with the input end of the second switch module, the second end of the relay is connected with the output end of the second switch module, the third end of the relay is connected with the input end of the second switch unit, the MCU is connected with the control end of the second switch unit through the eleventh resistor, and the output end of the second switch unit is grounded.
9. The amplifier protection circuit according to claim 8, wherein the second switching unit comprises a third transistor.
10. The amplifier protection circuit of claim 8, wherein the output circuit further comprises a relay power supply module electrically connected to the fourth terminal of the relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222502062.5U CN218603457U (en) | 2022-09-21 | 2022-09-21 | Amplifier protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222502062.5U CN218603457U (en) | 2022-09-21 | 2022-09-21 | Amplifier protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218603457U true CN218603457U (en) | 2023-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222502062.5U Active CN218603457U (en) | 2022-09-21 | 2022-09-21 | Amplifier protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218603457U (en) |
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2022
- 2022-09-21 CN CN202222502062.5U patent/CN218603457U/en active Active
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