CN217563307U - Load protection, monitoring and control circuit - Google Patents
Load protection, monitoring and control circuit Download PDFInfo
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- CN217563307U CN217563307U CN202123439964.0U CN202123439964U CN217563307U CN 217563307 U CN217563307 U CN 217563307U CN 202123439964 U CN202123439964 U CN 202123439964U CN 217563307 U CN217563307 U CN 217563307U
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Abstract
The utility model provides a load protection, monitoring, control circuit, a serial communication port, the circuit includes: the device comprises an interface module, a control module, an MOS (metal oxide semiconductor) tube, a protection module and a current monitoring module; the input end of the interface module is connected with an external power supply, and the output end of the interface module is connected with the source electrode of the MOS tube and used for connecting the external power supply with the MOS tube; the input end of the control module is connected with the micro control unit, the first output end of the control module is connected with the output end of the interface module, and the second output end of the control module is connected with the grid electrode of the MOS tube and used for realizing on-off control on the MOS tube; the input end of the protection module is connected with the drain electrode of the MOS tube; the input end of the current monitoring module is connected with the output end of the protection module, and the output end of the current monitoring module is connected with monitoring equipment. The utility model discloses a simple functional circuit has realized the function of load protection, load detection and control.
Description
Technical Field
The utility model relates to a control circuit technical field especially relates to a load protection, monitoring, control circuit.
Background
At present, most of the circuit modules are designed for MOS transistors to only implement a single function such as control, load current monitoring, or load protection, and there are few circuit modules that simultaneously implement control of MOS transistors, detection of the magnitude of current flowing through MOS transistors, and protection.
SUMMERY OF THE UTILITY MODEL
To the not enough that exists among the prior art, the utility model provides a load protection, monitoring, control circuit to functional circuit realizes multi-functional technical problem simultaneously in solving the correlation technique.
The utility model provides a load protection, monitoring, control circuit, the circuit includes:
the device comprises an interface module, a control module, an MOS (metal oxide semiconductor) tube, a protection module and a current monitoring module;
the input end of the interface module is connected with an external power supply, and the output end of the interface module is connected with the source electrode of the MOS tube and used for connecting the external power supply with the MOS tube;
the input end of the control module is connected with the micro control unit, the first output end of the control module is connected with the output end of the interface module, and the second output end of the control module is connected with the grid electrode of the MOS tube and used for realizing on-off control on the MOS tube;
the input end of the protection module is connected with the drain electrode of the MOS tube;
the input end of the current monitoring module is connected with the output end of the protection module, and the output end of the current monitoring module is connected with monitoring equipment.
Optionally, the interface module comprises:
the first end of the first capacitor is connected with the external power supply and the source electrode of the MOS tube respectively, and the second end of the first capacitor is grounded.
Optionally, the control module comprises:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a triode;
the first end of the first resistor is connected with the micro control unit, and the second end of the first resistor is connected with the base electrode of the triode;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded;
the emitting electrode of the triode is grounded, and the collector electrode of the triode is connected with the first end of the third resistor;
a first end of the fourth resistor is connected with a second end of the third resistor, and a second end of the fourth resistor is connected with a second end of the first capacitor;
and the grid electrode of the MOS tube is connected between the second end of the third resistor and the first end of the fourth resistor.
Optionally, the protection module comprises:
a first end of the second capacitor is connected with a drain electrode of the MOS tube, and a second end of the second capacitor is grounded;
a first end of the fifth resistor is connected with a drain electrode of the MOS tube, and a second end of the fifth resistor is grounded;
a terminal, a first end of the terminal being connected to a first end of the fifth resistor.
Optionally, the current monitoring module comprises;
a third capacitor, a first end of the third capacitor being connected to the second end of the terminal, a second end of the third capacitor being connected to ground;
a sixth resistor, a first end of the sixth resistor being connected to the second end of the terminal, a second end of the sixth resistor being connected to ground;
a first end of the seventh resistor is connected with the second end of the terminal, and a second end of the seventh resistor is connected with monitoring equipment.
Optionally, the source of the MOS transistor has a plurality of pins, and the plurality of pins of the source are connected in parallel to the first end of the first capacitor;
the drain electrode of the MOS tube is provided with a plurality of pins, and the pins of the drain electrode are connected with the first end of the second capacitor in parallel.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a merge control module, protection module, current monitoring module in the circuit. The control module is used for conducting and stopping the MOS tube to realize on-off control of the MOS tube; the output power supply is ensured to be stable when no equipment is connected through the protection module, and the safety of the circuit is improved; and the current monitoring module is used for sampling a voltage value and calculating the current of the current load to realize load monitoring. The circuit has simple structure and can realize the functions of load protection, monitoring and control at the same time.
Drawings
Fig. 1 is a schematic diagram of a module structure of the load protection, monitoring and control circuit of the present invention;
fig. 2 is a schematic diagram of the circuit structure of the load protection, monitoring and control circuit of the present invention.
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly understood, the following technical solutions of the present invention are further described with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, the present invention provides a load protection, monitoring and control circuit, which comprises:
the device comprises an interface module, a control module, an MOS (metal oxide semiconductor) tube, a protection module and a current monitoring module;
the input end of the interface module is connected with an external power supply, and the output end of the interface module is connected with the source electrode of the MOS tube and used for connecting the external power supply with the MOS tube;
the input end of the control module is connected with the micro control unit, the first output end of the control module is connected with the output end of the interface module, and the second output end of the control module is connected with the grid electrode of the MOS tube and is used for realizing on-off control on the MOS tube;
the input end of the protection module is connected with the drain electrode of the MOS tube;
the input end of the current monitoring module is connected with the output end of the protection module, and the output end of the current monitoring module is connected with monitoring equipment.
In the embodiment, an external power supply is connected with the MOS tube through an interface module, and the control module gives high and low levels through a connected micro control unit to achieve the conduction and the cut-off of the MOS tube and realize the control of the switch of the MOS tube; the protection module is used for ensuring that a stable power supply is output when no external equipment exists; and the current detection module is used for connecting the load current change to monitoring equipment to realize current monitoring.
Optionally, the interface module comprises:
the first end of the first capacitor C1 is connected with the external power supply and the source electrode of the MOS tube respectively, and the second end of the first capacitor C1 is grounded.
In this embodiment, the first capacitor C1 is used for filtering, and the external power supply connected to the first end of the first capacitor C1 is used for providing a working voltage for the MOS transistor.
Optionally, the control module comprises:
the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a triode Q1;
the first end of the first resistor R1 is connected with the micro control unit, and the second end of the first resistor R1 is connected with the base electrode of the triode Q1;
a first end of the second resistor R2 is connected with a second end of the first resistor R1, and a second end of the second resistor R2 is grounded;
the emitting electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is connected with the first end of the third resistor R3;
a first end of the fourth resistor R4 is connected to a second end of the third resistor R3, and a second end of the fourth resistor R4 is connected to a second end of the first capacitor C1;
the grid electrode of the MOS tube is connected between the second end of the third resistor R3 and the first end of the fourth resistor R4.
In this embodiment, the operating principle of the control module is as follows:
when the Micro Control Unit (MCU) outputs a high level, the triode Q1 is conducted through the voltage division of the first resistor R1 and the second resistor R2, the collector voltage of the triode Q1 is a low level, the second end of the first capacitor C1 and the grid electrode of the MOS tube are cut off, and the device in the output end direction of the MOS tube cannot work to play a role in closing.
When the Micro Control Unit (MCU) outputs a low level, the triode Q1 is cut off through the voltage division of the first resistor R1 and the second resistor R2, the collector voltage of the triode Q1 is a high level, the second end of the first capacitor C1 is conducted with the grid electrode of the MOS tube, and the equipment in the direction of the output end of the MOS tube works normally to play a role in starting.
Therefore, in this embodiment, the Micro Control Unit (MCU) controls the on/off of the transistor Q1 by outputting high/low levels, thereby implementing a control function.
Optionally, the protection module comprises:
a first end of the second capacitor C2 is connected with the drain electrode of the MOS tube, and a second end of the second capacitor C2 is grounded;
a fifth resistor R5, wherein a first end of the fifth capacitor R5 is connected with the drain electrode of the MOS transistor, and a second end of the fifth resistor R5 is grounded;
and a first end of the terminal J1 is connected with a first end of the fifth resistor R5.
In this embodiment, the first end of the second capacitor C2 is connected to the drain of the MOS transistor for load filtering, and the fifth resistor R5 is a dummy load, so as to ensure that the output power supply is stable when the second end of the terminal J1 is not connected to any device.
Optionally, the current monitoring module comprises:
a third capacitor C3, a first end of the third capacitor C3 is connected to the second end of the terminal J1, and a second end of the third capacitor C3 is grounded;
a sixth resistor R6, a first end of the sixth resistor R6 being connected to the second end of the terminal J1, and a second end of the sixth resistor R6 being grounded;
a seventh resistor R7, wherein a first end of the seventh resistor R7 is connected to the second end of the terminal J1, and a second end of the seventh resistor R7 is connected to a monitoring device.
In this embodiment, the third capacitor C3 is used for filtering, the first end of the sixth resistor R6 is connected to the second end of the terminal J1, the sixth resistor R6 adopts a high-power high-precision resistor to implement a load protection function, voltage flows into the monitoring device from the seventh resistor R7, the monitoring device collects a voltage value, and calculates the current value through the known resistor and voltage value to implement current monitoring.
Optionally, the source of the MOS transistor has a plurality of pins, and the plurality of pins of the source are connected in parallel to the first end of the first capacitor C1;
the drain electrode of the MOS tube is provided with a plurality of pins, and the pins of the drain electrode are connected with the first end of the second capacitor C2 in parallel.
In this embodiment, the pin 1, the pin 2, and the pin 3 of the MOS transistor are connected in parallel to the first end of the first capacitor C1, and the pin 5, the pin 6, the pin 7, and the pin 8 of the MOS transistor are connected in parallel to the first end of the second capacitor C2, so that a larger current flows through the MOS transistor with multiple pins.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (6)
1. Load protection, monitoring, control circuit, its characterized in that, the circuit includes:
the device comprises an interface module, a control module, an MOS (metal oxide semiconductor) tube, a protection module and a current monitoring module;
the input end of the interface module is connected with an external power supply, and the output end of the interface module is connected with the source electrode of the MOS tube and used for connecting the external power supply with the MOS tube;
the input end of the control module is connected with the micro control unit, the first output end of the control module is connected with the output end of the interface module, and the second output end of the control module is connected with the grid electrode of the MOS tube and used for realizing on-off control on the MOS tube;
the input end of the protection module is connected with the drain electrode of the MOS tube;
the input end of the current monitoring module is connected with the output end of the protection module, and the output end of the current monitoring module is connected with monitoring equipment.
2. The load protection, monitoring, control circuit of claim 1, wherein the interface module comprises:
the first end of the first capacitor is connected with the external power supply and the source electrode of the MOS tube respectively, and the second end of the first capacitor is grounded.
3. The load protection, monitoring, control circuit of claim 2, wherein the control module comprises:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a triode;
the first end of the first resistor is connected with the micro control unit, and the second end of the first resistor is connected with the base electrode of the triode;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded;
the emitting electrode of the triode is grounded, and the collector electrode of the triode is connected with the first end of the third resistor;
a first end of the fourth resistor is connected with a second end of the third resistor, and a second end of the fourth resistor is connected with a second end of the first capacitor;
and the grid electrode of the MOS tube is connected between the second end of the third resistor and the first end of the fourth resistor.
4. The load protection, monitoring, control circuit of claim 2, wherein the protection module comprises:
a first end of the second capacitor is connected with the drain electrode of the MOS tube, and a second end of the second capacitor is grounded;
a first end of the fifth resistor is connected with a drain electrode of the MOS tube, and a second end of the fifth resistor is grounded;
and a first end of the terminal is connected with a first end of the fifth resistor.
5. The load protection, monitoring, control circuit of claim 4, wherein the current monitoring module comprises;
a third capacitor, a first end of the third capacitor being connected to the second end of the terminal, a second end of the third capacitor being connected to ground;
a sixth resistor, a first end of the sixth resistor being connected to the second end of the terminal, and a second end of the sixth resistor being grounded;
a first end of the seventh resistor is connected with the second end of the terminal, and a second end of the seventh resistor is connected with monitoring equipment.
6. The load protection, monitoring and control circuit of claim 4 wherein the source of the MOS transistor has a plurality of pins, the plurality of pins of the source being connected in parallel to the first terminal of the first capacitor;
and the drain electrode of the MOS tube is provided with a plurality of pins, and the pins of the drain electrode are connected with the first end of the second capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123439964.0U CN217563307U (en) | 2021-12-31 | 2021-12-31 | Load protection, monitoring and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123439964.0U CN217563307U (en) | 2021-12-31 | 2021-12-31 | Load protection, monitoring and control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217563307U true CN217563307U (en) | 2022-10-11 |
Family
ID=83465658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123439964.0U Active CN217563307U (en) | 2021-12-31 | 2021-12-31 | Load protection, monitoring and control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217563307U (en) |
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2021
- 2021-12-31 CN CN202123439964.0U patent/CN217563307U/en active Active
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