CN210246297U - Load control output circuit with output short-circuit protection - Google Patents
Load control output circuit with output short-circuit protection Download PDFInfo
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- CN210246297U CN210246297U CN201921399687.5U CN201921399687U CN210246297U CN 210246297 U CN210246297 U CN 210246297U CN 201921399687 U CN201921399687 U CN 201921399687U CN 210246297 U CN210246297 U CN 210246297U
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Abstract
The utility model discloses a load control output circuit of area output short-circuit protection, including load circuit, switch tube Q1, resistance R1, resistance R2, field effect transistor Q2, resistance R3, resistance R7 and sampling control circuit, wherein, load circuit 'S one end and switch tube Q1' S E utmost point ground connection, load circuit 'S the other end connection field effect transistor Q2' S S utmost point; the resistor R3, the resistor R1 and the resistor R2 are sequentially connected in series, the D pole of the field-effect tube Q2 is connected with the resistor R3, the C pole of the switch tube Q1 is connected with the resistor R2, the G pole of the field-effect tube Q2 is connected between the resistor R1 and the resistor R2, and the resistor R3 and the resistor R1 are externally connected with source voltage; the B pole of the switching tube Q1 is externally connected with the output end of a driving signal through a resistor R7; the sampling control circuit is connected with two ends of the resistor R3. The switch for supplying power to the load is controlled by detecting the current flowing through the load loop, so that the power supply for supplying power to the load in an abnormal state is cut off to achieve the protection purpose.
Description
Technical Field
The utility model relates to an automotive electronics technical field especially relates to a load control output circuit of area output short-circuit protection.
Background
In the existing electronic component control process of an automobile, an output circuit is often required to drive loads such as a relay coil or a small motor; as shown in fig. 1, when the Drive _ signal is at a high level, the Q1 transistor is turned on, so that a voltage is generated between R1 and R2 to Drive the Q2 transistor to be turned on, thereby powering the load circuit. However, when the load is abnormally short-circuited, the output circuit may burn itself out due to the load short-circuited.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides a load control output circuit of area output short-circuit protection to make the power that can cut off load under abnormal condition, in order to reach the protection purpose.
In order to solve the technical problem, an embodiment of the present invention provides a load control output circuit with output short-circuit protection, including a load circuit, a switch tube Q1, a resistor R1, a resistor R2, a field effect transistor Q2, a resistor R3, a resistor R7, and a sampling control circuit, wherein one end of the load circuit and an E pole of the switch tube Q1 are grounded, and the other end of the load circuit is connected to an S pole of the field effect transistor Q2; the resistor R3, the resistor R1 and the resistor R2 are sequentially connected in series, the D pole of the field-effect tube Q2 is connected with the resistor R3, the C pole of the switch tube Q1 is connected with the resistor R2, the G pole of the field-effect tube Q2 is connected between the resistor R1 and the resistor R2, and the resistor R3 and the resistor R1 are externally connected with source voltage; the B pole of the switching tube Q1 is externally connected with the output end of a driving signal through a resistor R7; the sampling control circuit is connected with two ends of the resistor R3, and controls the on/off of the switching tube Q1 by detecting the current flowing through the R3.
Further, the sampling control circuit comprises a resistor R4, a resistor R5, a resistor R6, a switch tube Q3 and a switch tube Q4, wherein the B pole of the switch tube Q3 is connected between the D pole of the field effect tube Q2 and the resistor R3 through a resistor R4, and the C pole of the switch tube Q3 is connected between the resistor R3 and the resistor R1; the resistor R5 and the resistor R6 are connected in series, the E pole of the switching tube Q3 is connected with the resistor R5, and the E pole of the switching tube Q4 and the resistor R6 are both grounded; the B pole of the switching tube Q4 is connected between the resistor R5 and the resistor R6, and the C pole of the switching tube Q4 controls the B pole of the switching tube Q1 through the resistor R7.
Furthermore, the sampling control circuit comprises a comparator, the input end of the comparator is connected with two ends of the R3, and the output end of the comparator is connected with the AD port of the main chip.
The utility model discloses beneficial effect does: the utility model discloses a switch for the load power supply is controlled to the electric current size that detects the load return circuit that flows to cut off the power of the load power supply for abnormal state, reach the protection purpose.
Drawings
Fig. 1 is a circuit diagram of a load control output circuit commonly used in automotive electronics in the prior art.
Fig. 2 is a circuit diagram of a load control output circuit with output short-circuit protection according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a load control output circuit with output short-circuit protection according to another embodiment of the present invention.
Fig. 4 is a schematic flow chart of a control method of a load control output circuit with output short-circuit protection according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 2 to 3, a load control output circuit with output short-circuit protection according to an embodiment of the present invention includes a load circuit, a switch Q1, a resistor R1, a resistor R2, a field effect transistor Q2, a resistor R3, a resistor R7, and a sampling control circuit.
One end of the load circuit is grounded with the E pole of the switch tube Q1, and the other end of the load circuit is connected with the S pole of the field effect tube Q2. The resistor R3, the resistor R1 and the resistor R2 are sequentially connected in series, the D pole of the field-effect tube Q2 is connected with the resistor R3, the C pole of the switch tube Q1 is connected with the resistor R2, the G pole of the field-effect tube Q2 is connected between the resistor R1 and the resistor R2, and the resistor R3 and the resistor R1 are externally connected with source voltage. The B pole of the switching tube Q1 is externally connected with the output end of a driving signal through a resistor R7; the sampling control circuit is connected with two ends of the resistor R3, and controls the on/off of the switching tube Q1 by detecting the current flowing through the R3.
As an implementation mode, the sampling control circuit comprises a resistor R4, a resistor R5, a resistor R6, a switch tube Q3 and a switch tube Q4, wherein the B pole of the switch tube Q3 is connected between the D pole of the field effect tube Q2 and the resistor R3 through a resistor R4, and the C pole of the switch tube Q3 is connected between the resistor R3 and the resistor R1; the resistor R5 and the resistor R6 are connected in series, the E pole of the switching tube Q3 is connected with the resistor R5, and the E pole of the switching tube Q4 and the resistor R6 are both grounded; the B pole of the switching tube Q4 is connected between the resistor R5 and the resistor R6, and the C pole of the switching tube Q4 controls the B pole of the switching tube Q1 through the resistor R7. As shown in fig. 2, when a short circuit abnormality occurs in the load circuit, the current flowing through the resistor R3 increases, the voltage drop across the resistor R3 also increases, so that the switching tube Q3 is turned on, then the voltage division across the resistor R5 and the resistor R6 turns on the switching tube Q4, after the switching tube Q4 is turned on, the protect _ signal is pulled low, so that the switching tube Q1 is turned off, the voltage division is not formed across the resistor R1 and the resistor R2, the switching tube Q2 is turned off, and thus the load circuit is powered off.
As an implementation mode, the load control output circuit with output short-circuit protection further comprises a main chip, the sampling control circuit comprises a comparator, the input end of the comparator is connected with two ends of the R3, and the output end of the comparator is connected with an AD port of the main chip. As shown in fig. 3, the comparator sends the current sampled signal to the AD port of the main chip, and the main chip determines whether the current exceeds the limit value through the signal detected by the AD port to turn off the power supply of the load.
Referring to fig. 4, an embodiment of the present invention provides a method for controlling a load control output circuit with output short-circuit protection, including: and detecting the current flowing through the resistor R3, and controlling the switching tube Q1 to be switched off when the current is greater than a preset threshold value, so as to control the field effect tube Q2 to be switched off, thereby powering off the load circuit.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A load control output circuit with output short-circuit protection comprises a load circuit, a switching tube Q1, a resistor R1, a resistor R2 and a field effect tube Q2, and is characterized by further comprising a resistor R3, a resistor R7 and a sampling control circuit, wherein one end of the load circuit is grounded with an E pole of the switching tube Q1, and the other end of the load circuit is connected with an S pole of the field effect tube Q2; the resistor R3, the resistor R1 and the resistor R2 are sequentially connected in series, the D pole of the field-effect tube Q2 is connected with the resistor R3, the C pole of the switch tube Q1 is connected with the resistor R2, the G pole of the field-effect tube Q2 is connected between the resistor R1 and the resistor R2, and the resistor R3 and the resistor R1 are externally connected with source voltage; the B pole of the switching tube Q1 is externally connected with the output end of a driving signal through a resistor R7; the sampling control circuit is connected with two ends of the resistor R3, and controls the on/off of the switching tube Q1 by detecting the current flowing through the R3.
2. The load control output circuit with output short-circuit protection as claimed in claim 1, wherein the sampling control circuit includes a resistor R4, a resistor R5, a resistor R6, a switch Q3 and a switch Q4, the B pole of the switch Q3 is connected between the D pole of the fet Q2 and the resistor R3 through a resistor R4, and the C pole of the switch Q3 is connected between the resistor R3 and the resistor R1; the resistor R5 and the resistor R6 are connected in series, the E pole of the switching tube Q3 is connected with the resistor R5, and the E pole of the switching tube Q4 and the resistor R6 are both grounded; the B pole of the switching tube Q4 is connected between the resistor R5 and the resistor R6, and the C pole of the switching tube Q4 controls the B pole of the switching tube Q1 through the resistor R7.
3. The load control output circuit with output short-circuit protection as claimed in claim 1, further comprising a main chip, wherein the sampling control circuit comprises a comparator, an input terminal of the comparator is connected to two ends of the R3, and an output terminal of the comparator is connected to the AD port of the main chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921399687.5U CN210246297U (en) | 2019-08-27 | 2019-08-27 | Load control output circuit with output short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921399687.5U CN210246297U (en) | 2019-08-27 | 2019-08-27 | Load control output circuit with output short-circuit protection |
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| Publication Number | Publication Date |
|---|---|
| CN210246297U true CN210246297U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921399687.5U Active CN210246297U (en) | 2019-08-27 | 2019-08-27 | Load control output circuit with output short-circuit protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504655A (en) * | 2019-08-27 | 2019-11-26 | 深圳市法拉第电驱动有限公司 | Load control output circuit and its control method with output short circuit protection |
-
2019
- 2019-08-27 CN CN201921399687.5U patent/CN210246297U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504655A (en) * | 2019-08-27 | 2019-11-26 | 深圳市法拉第电驱动有限公司 | Load control output circuit and its control method with output short circuit protection |
| CN110504655B (en) * | 2019-08-27 | 2024-03-29 | 深圳市法拉第电驱动有限公司 | Load control output circuit with output short-circuit protection and control method thereof |
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