CN219592110U - Active antenna power supply protection and diagnosis circuit - Google Patents
Active antenna power supply protection and diagnosis circuit Download PDFInfo
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- CN219592110U CN219592110U CN202320764002.2U CN202320764002U CN219592110U CN 219592110 U CN219592110 U CN 219592110U CN 202320764002 U CN202320764002 U CN 202320764002U CN 219592110 U CN219592110 U CN 219592110U
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Abstract
An active antenna supply protection and diagnostic circuit comprising: the sampling module is used for sampling a current signal in the loop; the mirror image current source module is connected with the sampling module; the negative feedback loop is connected with the mirror current source module to form a closed feedback loop; the control module is connected with the sampling module through a first resistor and is connected with the mirror image current source module; the power module is connected with the MCU control module and is connected with the load through the sampling module. The utility model adds the mirror current source system, when the power supply needed by the load is cut off, the overcurrent is still detected, the short circuit can be deduced to occur between the first resistor and the power supply, and the controller interrupts the switch control signal at the eighth resistor at the moment, so that the detection circuit except the first resistor is ensured to be in a closed state, and the detection circuit is protected.
Description
Technical Field
The utility model relates to the field of electricity, in particular to the field of automobile electronics, and particularly relates to a power supply protection and diagnosis circuit of an active antenna.
Background
In the prior art, the short-circuit protection system of the vehicle-mounted antenna has the following problems: when the power supply line of the power supply is grounded and short-circuited or short-circuited to VCC to cause current backflow, damage to components such as chips and capacitors in the system can be caused, even if the power supply is turned off in time, the influence of partial faults of the load and detection circuit can be further enlarged when the current backflow occurs, so that the whole system breaks down, and serious operation accidents and large economic losses are caused.
Disclosure of Invention
The utility model aims to provide an active antenna power supply protection and diagnosis circuit which aims to solve the technical problem that in the prior art, even if a power supply is turned off in time when a vehicle-mounted antenna is short-circuited or is short-circuited to VCC, the influence of partial faults of a load and a detection circuit is still caused when current flows backwards.
The utility model relates to an active antenna power supply protection and diagnosis circuit, which comprises:
the sampling module is used for sampling a current signal in the loop;
the mirror image current source module is connected with the sampling module;
the negative feedback loop is connected with the mirror current source module to form a closed feedback loop;
the control module is connected with the sampling module through a first resistor and is connected with the mirror image current source module;
the power module is connected with the MCU control module and is connected with the load through the sampling module.
Further, the sampling module comprises a first resistor; the mirror current source module comprises a mirror current source circuit, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a seventh resistor, wherein the mirror current source circuit comprises a first triode, a second triode, a third triode, a fourth triode, a sixth resistor and an eighth resistor; the negative feedback loop comprises a field effect transistor; the control module comprises a sixth resistor, an eighth resistor and an MCU controller; the power module comprises a power supply;
the first port of MCU controller is connected with the first end of eighth resistor, the second end of eighth resistor is connected with the base of third triode, the first end of fourth triode and the first end of seventh resistor, the second end of seventh resistor is grounded, the projecting pole of third triode is connected with the first end of fourth resistor, the second end of fourth resistor is grounded, the projecting pole of fourth triode is connected with the first end of fifth resistor, the second end of fifth resistor is grounded, the collector of third triode, the collector of first triode is connected with the grid of field effect transistor, the base of first triode is connected with the base of second triode, the projecting pole of first triode is connected with the first end of second resistor, the drain of field effect transistor, the second port of controller is connected with the source of field effect transistor, the first end of sixth resistor, the second end of sixth resistor is grounded, the second end of second resistor, the first end of first resistor and the controller are all connected with the power supply, the base of first triode is connected with the third triode, the third triode is connected with the third triode.
Compared with the prior art, the utility model has positive and obvious effects. The utility model adds the mirror current source system, when the power supply needed by the load is cut off, the overcurrent is still detected, the short circuit can be deduced to occur between the first resistor and the power supply, and the controller interrupts the switch control signal at the eighth resistor at the moment, so that the detection circuit except the first resistor is ensured to be in a closed state, and the detection circuit is protected.
Drawings
Fig. 1 is a schematic diagram of an active antenna power supply protection and diagnosis circuit according to the present utility model.
Fig. 2 is a schematic circuit diagram of an active antenna power protection and diagnosis circuit according to the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model and the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1 and 2, an active antenna power supply protection and diagnosis circuit of the present utility model includes:
the sampling module is used for sampling a current signal in the loop;
the mirror image current source module is connected with the sampling module and used for outputting the same current source signal;
the negative feedback loop is connected with the mirror current source module to form a closed feedback loop, so as to stabilize the current signal of the mirror current source;
the control module is connected with the sampling module through a first resistor R1, and the first resistor R1 provides a voltage signal for the control module to detect the voltage and process the voltage to obtain real-time current data; the control module is connected with the mirror image current source module and used for controlling the on-off of the power supply module and the antenna short-circuit protection circuit;
the power supply module is connected with the MCU control module and is controlled by the control module to control the on-off state; the power supply module is connected with a load through the sampling module and outputs voltage V IN 。
Further, the sampling module comprises a first resistor R1; the mirror current source module comprises a mirror current source circuit, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a seventh resistor R7, wherein the mirror current source circuit comprises a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4, a sixth resistor R6 and an eighth resistor R8; the negative feedback loop comprises a field effect transistor Q5; the control module comprises a sixth resistor R6, an eighth resistor R8 and a controller MCU; the POWER module comprises a POWER supply;
the first port of the controller MCU is connected with the first end of an eighth resistor R8, the second end of the eighth resistor R8 is connected with the base electrode of a third triode Q3, the base electrode of a fourth triode Q4 and the first end of a seventh resistor R7, the second end of the seventh resistor R7 is grounded, the emitter electrode of the third triode Q3 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, the emitter electrode of the fourth triode Q4 is connected with the first end of a fifth resistor R5, the second end of the fifth resistor R5 is grounded, the collector electrode of the third triode Q3, the collector electrode of the first triode Q1 is connected with the gate electrode of a field effect transistor Q5, the emitter electrode of the first triode Q1 is connected with the first end of the second resistor R2, the drain electrode of the field effect transistor Q5 is connected with the first end of the third resistor Q5, the second end of the third triode Q6 is connected with the third end of the third resistor Q2, the drain electrode of the third triode Q2 is connected with the third end of the third triode Q2, the drain electrode of the third triode Q2 is connected with the third end of the third triode Q2.
The wake-up signal is generated by a controller MCU of the MCU control module, is directly connected to bases of a third triode Q3 and a fourth triode Q4, the third triode Q3 and the fourth triode Q4 are started when the wake-up signal is at a high level of 5V, the whole active antenna-based power supply protection and diagnosis circuit system starts to work, real-time current signals are collected, the third triode Q3 and the fourth triode Q4 are closed when the wake-up signal is at a low level of 0V, and the whole active antenna-based power supply protection and diagnosis circuit system stops working.
Specifically, the controller, the resistor, the triode, the POWER supply POWER, the Load and the like in the embodiment all adopt well-known schemes in the prior art, and those skilled in the art are aware of the schemes and are not described herein again.
The working principle of the embodiment is as follows:
first, the design concept of the present utility model will be briefly described.
In this embodiment, when the controller MCU outputs up to 5V enable signal, the constant current source formed by the third transistor Q3, the fourth resistor R4, the fourth transistor Q4, and the fifth resistor R5 will start to operate.
The third transistor Q3 and the fourth transistor Q4 on the mirror current source are completely symmetrical and the same NPN type universal bipolar transistor is selected, the resistance of the fourth resistor R4 is the same as the resistance of the fifth resistor R5, then the current ie_q3 on the collector of the third transistor Q3 will be equal to the collector current ie_q4 of the fourth transistor Q4, the first transistor Q1 and the second transistor Q2 are completely symmetrical and the same PNP type universal bipolar transistor is selected, the resistances of the first resistor R1, the second resistor R2 and the third resistor R3 have the following relation r1+r3=r2, when the current gain of the first transistor Q1 and the second transistor Q2 exceeds 10 times the base current and more, the bias current on the base is negligible, then the currents ic_q1=q2 and ie_q1=q2, node e1=e2.
When e1> e2, the fet Q5 and the first transistor Q1 form a negative feedback, the first transistor Q1 passes more current, and the third transistor Q3 absorbs a fixed current on the collector, so that the voltage of the gate node of the fet Q5 will rise, the fet Q5 will absorb current from the second resistor R2 near the end of the first transistor Q1, and the voltage of the node e1 will drop.
When e1< e2, the fet Q5 will sink less current from the second resistor R2 and the node e1 will rise.
When the load current is Io, the node e2 voltage:
e2＝vin–(r1*Io+(r1+r3)*Ie_q2)；
e1＝vin–r2*Id_q5+r2*Ie_q1。
further e1=e2, ie_q1=ie_q2, then id_q5=r1×io/R2, and since id_q5=is_q5, the voltage on the sixth resistor R6 Is Vr 6=r6×r1×io/R2.
When the controller MCU enabling signal is as low as 0V, the third triode Q3 and the fourth triode Q4 are turned off, meanwhile, the first triode Q1 and the second triode Q2 are caused to have no bias current, and the short-circuit protection system of the vehicle-mounted antenna is turned off so as to save current when the standby mode is sleeping.
The bias currents of the first transistor Q1 and the second transistor Q2 are fixed, and do not change with the change of the load and vin, and the output is stable.
The collector of the second triode Q2 is connected to the base of the second triode Q2 and the base of the first triode Q1, so as to ensure vce2=vbe2, so that the triode is in an amplified state (the precondition of the operation of a mirrored current source).
The utility model adds a mirror current source system, when the power supply required by the load is cut off, the overcurrent is still detected, and then the short circuit is deduced to occur between the first resistor R1 and the power supply power, and at the moment, the controller MCU interrupts the switch control signal at the eighth resistor R8, so that the detection circuit except the first resistor R1 is ensured to be in a closed state, and the detection circuit is protected.
Claims (2)
1. An active antenna supply protection and diagnostic circuit comprising:
the sampling module is used for sampling a current signal in the loop;
the mirror image current source module is connected with the sampling module;
the negative feedback loop is connected with the mirror current source module to form a closed feedback loop;
the control module is connected with the sampling module through a first resistor and is connected with the mirror image current source module;
the power module is connected with the control module and connected with the load through the sampling module.
2. The active antenna supply protection and diagnostic circuit of claim 1 wherein the sampling module comprises a first resistor; the mirror current source module comprises a mirror current source circuit, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a seventh resistor, wherein the mirror current source circuit comprises a first triode, a second triode, a third triode, a fourth triode, a sixth resistor and an eighth resistor; the negative feedback loop comprises a field effect transistor; the control module comprises a sixth resistor, an eighth resistor and an MCU controller; the power module comprises a power supply;
the first port of MCU controller MCU is connected with the first end of eighth resistor, the second end of eighth resistor is connected with the base electrode of third triode, the base electrode of fourth triode and the first end of seventh resistor, the second end of seventh resistor is grounded, the emitter electrode of third triode is connected with the first end of fourth resistor, the second end of fourth resistor is grounded, the emitter electrode of fourth triode is connected with the first end of fifth resistor, the second end of fifth resistor is grounded, the collector electrode of third triode and the collector electrode of first triode are connected with grid electrode of field effect transistor, the base electrode of first triode is connected with base electrode of second triode, the emitter of the first triode is connected with the first end of the second resistor and the drain electrode of the field effect transistor, the second port of the controller is connected with the source electrode of the field effect transistor and the first end of the sixth resistor, the second end of the sixth resistor is grounded, the second end of the second resistor, the first end of the first resistor and the controller are all connected with a power supply, the collector of the fourth triode is connected with the collector of the second triode, the collector of the second triode is connected with the base of the second triode and the base of the first triode, the emitter of the second triode is connected with the first end of the third resistor, and the second end of the third resistor and the second end of the first resistor are all connected with a load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320764002.2U CN219592110U (en) | 2023-04-06 | 2023-04-06 | Active antenna power supply protection and diagnosis circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320764002.2U CN219592110U (en) | 2023-04-06 | 2023-04-06 | Active antenna power supply protection and diagnosis circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219592110U true CN219592110U (en) | 2023-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320764002.2U Active CN219592110U (en) | 2023-04-06 | 2023-04-06 | Active antenna power supply protection and diagnosis circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219592110U (en) |
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2023
- 2023-04-06 CN CN202320764002.2U patent/CN219592110U/en active Active
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