CN218415793U - High-side output protection circuit with current monitoring function - Google Patents
High-side output protection circuit with current monitoring function Download PDFInfo
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- CN218415793U CN218415793U CN202222433697.4U CN202222433697U CN218415793U CN 218415793 U CN218415793 U CN 218415793U CN 202222433697 U CN202222433697 U CN 202222433697U CN 218415793 U CN218415793 U CN 218415793U
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Abstract
The utility model relates to the technical field of high-side circuit protection, in particular to a high-side output protection circuit with current monitoring, which comprises a main input end Vin, a main output end Vout and a control signal DO; the high-side output protection circuit also comprises a high-side output driving circuit, a current sampling amplifying circuit and a hysteresis comparison circuit; the utility model controls the output to be turned off when the output current is larger than the set value through the current sampling amplifying circuit and the hysteresis comparison circuit which are arranged on the high-side output driving circuit and are matched for application, thereby realizing the circuit protection and the current monitoring function of high-side output; the hysteresis comparison circuit has a turn-off holding function, and when the circuit current exceeds a set value, the PMOS keeps a turn-off state and is not controlled by input, so that the protection effect on the high-side circuit is enhanced; the manufacturing and using cost of the protection circuit is low, and devices of the protection circuit can be completely localized, so that the protection circuit is beneficial to large-scale popularization and use.
Description
Technical Field
The utility model relates to a high limit output circuit protects technical field, concretely relates to high limit output protection circuit of electrified current monitoring.
Background
In engineering circuit applications, high-side output circuits are often used in the fields of automotive electronics, engineering machinery, and the like. No matter the power supply design inside the product or the power supply design of the peripheral equipment, except that the basic requirements such as voltage, current and the like are required to be met, when the load (inside or outside) is in short circuit abnormality, the product cannot be damaged by devices, and cannot smoke or catch fire. Therefore, a short-circuit protection module is required to be disposed inside the electronic product.
The conventional short-circuit protection circuit only has a short-circuit protection function and has poor protection effect; and the chip pair used by the existing short-circuit protection circuit is an imported component, so that the price is high, and the wide-range popularization and application are not facilitated.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing shortcoming of the prior art, an object of the utility model is to provide a complete utility model name for solve among the prior art short-circuit protection circuit only have short-circuit protection function, the chip that protection effect is not good and current short-circuit protection circuit uses is to for importing components and parts, and is expensive, is unfavorable for the problem of popularizing and applying on a large scale.
In order to achieve the above and other related objects, the present invention provides a high-side output protection circuit with current monitoring, which includes a main input terminal Vin, a main output terminal Vout, and a control signal DO;
the high-side output protection circuit also comprises a high-side output driving circuit, a current sampling amplifying circuit and a hysteresis comparison circuit;
the high-side output driving circuit comprises a high-side PMOS (P-channel metal oxide semiconductor) tube Q1, a second triode Q2, a first resistor R1, a second resistor R2 and a third resistor R3; the high-side output driving circuit is connected with a main input end Vin through a high-side PMOS (P-channel metal oxide semiconductor) tube Q1 and is connected with a control signal DO through a second triode Q2;
the current sampling amplifying circuit comprises a sampling resistor R10, an operational amplifier U2, a fifth resistor R5, a seventh resistor R7, a second capacitor C2, a thirteenth resistor R13, a fifteenth resistor R15, a sixth capacitor C6, a fourteenth resistor R14, a seventeenth resistor R17 and a fourth capacitor C4; the sampling resistor R10 is connected in parallel between the high-side PMOS tube Q1 and the main output end Vout, so that the current sampling amplifying circuit is connected with the high-side output driving circuit and the main output end Vout;
the hysteresis comparison circuit comprises a comparator U1, an eleventh resistor R11, a twelfth resistor R12, a fifth capacitor C5, a fourth resistor R4, a third capacitor C3, an eighth resistor R8, a first capacitor C1, a sixth resistor R6, a ninth resistor R9 and a third triode Q3; the hysteresis comparison circuit is connected with the operational amplifier U2 through the comparator U1 so as to be connected with the current sampling amplification circuit, and is connected with the control signal DO through the third triode Q3.
In an embodiment of the present invention, the connection between the electronic components in the high-side output driving circuit is as follows:
the source electrode of the high-side PMOS tube Q1 is connected with the main input end Vin, and the grid electrode of the high-side PMOS tube Q1 is connected with the collector electrode of the second triode Q2;
the second resistor R2 is connected in parallel between the grid and the source of the high-side PMOS tube Q1;
the base electrode of the second triode Q2 is connected with a control signal DO, and the emitting electrode of the second triode Q2 is grounded;
the third resistor R3 is connected between the base of the second triode Q2 and the control signal DO;
the first resistor R1 is connected between the emitter and the base of the second triode Q2.
In an embodiment of the present invention, the connection between the electronic components in the current sampling amplifying circuit is as follows:
the fifth resistor R5 is connected between the inverting input end of the operational amplifier U2 and the drain electrode of the high-side PMOS tube Q1;
the seventh resistor R7 and the second capacitor C2 are both connected in parallel between the inverting input end and the output end of the operational amplifier U2;
the thirteenth resistor R13 is connected between the non-inverting input end of the operational amplifier U2 and the main output end Vout;
the fifteenth resistor R15 and the sixth capacitor C6 are connected in parallel to the non-inverting input end of the operational amplifier U2, and the other ends of the fifteenth resistor R15 and the sixth capacitor C6 are connected in parallel to the ground;
the fourteenth resistor R14 is connected to the output end of the operational amplifier U2;
the seventeenth resistor R17 and the fourth capacitor C4 are connected in parallel to the output end of the operational amplifier U2, and the other ends of the seventeenth resistor R17 and the fourth capacitor C4 are connected in parallel to the ground;
the non-inverting input end of the operational amplifier U2 is used for amplifying the power supply voltage V0, and the inverting input end of the operational amplifier U2 is grounded.
In an embodiment of the present invention, the connections between the electronic components in the hysteresis comparison circuit are as follows:
the eleventh resistor R11 and the twelfth resistor R12 are connected between the non-inverting input end of the comparator U1 and the output end of the operational amplifier U2 in series;
one end of the fifth capacitor C5 is connected to the output end of the comparator U1, and the other end of the fifth capacitor C is grounded;
the fourth resistor R4 and the third capacitor C3 are connected in parallel to the reverse input end of the comparator U1, and the other ends of the fourth resistor R4 and the third capacitor C3 are connected in parallel to the ground;
the eighth resistor R8 and the first capacitor C1 are connected in series with the reverse input end of the comparator U1, and the other end of the first capacitor C1 is grounded;
the ninth resistor R9 is connected between the output end of the comparator U1 and the base electrode of the third triode Q3;
the emitting electrode of the third triode Q3 is grounded, and the collecting electrode of the third triode Q3 is connected with a control signal DO;
the sixth resistor R6 is connected to the base electrode of the third triode Q3, and the other end of the sixth resistor R6 is connected with a base electrode voltage V1;
and the in-phase input end of the comparator U1 is connected with an operational amplifier power supply voltage V0, and the reverse phase input end is grounded.
In an embodiment of the present invention, the second triode Q2 and the third triode Q3 are NPN triodes.
In an embodiment of the present invention, the resistance of the fifth resistor R5 is the same as the resistance of the thirteenth resistor R13, the resistance of the seventh resistor R7 is the same as the resistance of the fifteenth resistor R15, and the amplification factor of the current sampling amplifying circuit is the fifth resistor R5/the seventh resistor R7.
In an embodiment of the present invention, the fourteenth resistor R14 and the seventeenth resistor R17 are voltage dividing resistors.
In an embodiment of the present invention, the main output terminal Vout is grounded, and a sixteenth resistor R16 is connected between the main output terminal Vout and the ground.
In an embodiment of the present invention, a voltage regulator diode D1 is connected between the non-inverting input terminal and the output terminal of the comparator U1.
As above, the utility model provides a high limit output protection circuit with current monitoring has following beneficial effect:
1. when the output current is larger than a set value, the output is controlled to be turned off through a current sampling amplifying circuit and a hysteresis comparison circuit which are arranged on the high-side output driving circuit and are matched with the high-side output driving circuit, so that the high-side output circuit protection and current monitoring functions are realized;
2. the hysteresis comparison circuit has a turn-off holding function, and when the circuit current exceeds a set value, the PMOS keeps a turn-off state and is not controlled by input, so that the protection effect on the high-side circuit is enhanced;
3. the protection circuit only uses conventional components such as an operational amplifier, a comparator, a triode and the like, the manufacturing and using cost is low, and devices of the protection circuit can be completely made into a home, so that the protection circuit is beneficial to large-scale popularization and use.
Drawings
Fig. 1 is a schematic structural diagram of a high-side output protection circuit with current monitoring disclosed in an embodiment of the present invention.
Detailed Description
The following description is given for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present invention.
Please refer to fig. 1. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Referring to fig. 1, the present invention provides a high-side output protection circuit with current monitoring, which includes a main input terminal Vin, a main output terminal Vout, and a control signal DO, wherein the main output terminal Vout is grounded, and a sixteenth resistor R16 is connected between the main output terminal Vout and the ground. The high-side output protection circuit further comprises a high-side output driving circuit, a current sampling amplifying circuit and a hysteresis comparison circuit.
The high-side output driving circuit comprises a high-side PMOS (P-channel metal oxide semiconductor) tube Q1, a second triode Q2, a first resistor R1, a second resistor R2 and a third resistor R3; the high-side output driving circuit is connected with a main input end Vin through a high-side PMOS (P-channel metal oxide semiconductor) tube Q1 and is connected with a control signal DO through a second triode Q2;
the current sampling amplifying circuit comprises a sampling resistor R10, an operational amplifier U2, a fifth resistor R5, a seventh resistor R7, a second capacitor C2, a thirteenth resistor R13, a fifteenth resistor R15, a sixth capacitor C6, a fourteenth resistor R14, a seventeenth resistor R17 and a fourth capacitor C4; the sampling resistor R10 is connected in parallel between the high-side PMOS tube Q1 and the main output end Vout, so that the current sampling amplifying circuit is connected with the high-side output driving circuit and the main output end Vout;
the hysteresis comparison circuit comprises a comparator U1, an eleventh resistor R11, a twelfth resistor R12, a fifth capacitor C5, a fourth resistor R4, a third capacitor C3, an eighth resistor R8, a first capacitor C1, a sixth resistor R6, a ninth resistor R9 and a third triode Q3; the hysteresis comparison circuit is connected with the operational amplifier U2 through the comparator U1 so as to be connected with the current sampling amplification circuit, and is connected with the control signal DO through the third triode Q3.
The connections between the electronic components in the high-side output driving circuit are as follows:
the source electrode of the high-side PMOS tube Q1 is connected with the main input end Vin, and the grid electrode of the high-side PMOS tube Q1 is connected with the collector electrode of the second triode Q2;
the second resistor R2 is connected in parallel between the grid and the source of the high-side PMOS tube Q1;
the base electrode of the second triode Q2 is connected with a control signal DO, and the emitting electrode of the second triode Q2 is grounded;
the third resistor R3 is connected between the base of the second triode Q2 and the control signal DO;
the first resistor R1 is connected between the emitter and the base of the second triode Q2.
When the control signal DO is at a high level, the second triode Q2 is conducted, the high-side PMOS tube Q1 is conducted, and the main output end Vout outputs a high level; when the control signal DO is at a low level, the second triode Q2 is not turned on, the high-side PMOS transistor Q1 is not turned on, and the main output terminal Vout does not output.
The connection among the electronic components in the current sampling amplifying circuit is as follows:
the fifth resistor R5 is connected between the inverting input end of the operational amplifier U2 and the drain electrode of the high-side PMOS tube Q1;
the seventh resistor R7 and the second capacitor C2 are connected in parallel between the inverting input end and the output end of the operational amplifier U2;
the thirteenth resistor R13 is connected between the non-inverting input end of the operational amplifier U2 and the main output end Vout;
the fifteenth resistor R15 and the sixth capacitor C6 are connected in parallel to the non-inverting input end of the operational amplifier U2, and the other ends of the fifteenth resistor R15 and the sixth capacitor C6 are connected in parallel to the ground;
the fourteenth resistor R14 is connected to the output end of the operational amplifier U2;
the seventeenth resistor R17 and the fourth capacitor C4 are connected in parallel to the output end of the operational amplifier U2, and the other ends of the seventeenth resistor R17 and the fourth capacitor C4 are connected in parallel to the ground; the fourteenth resistor R14 and the seventeenth resistor R17 are voltage dividing resistors;
the operational amplifier U2 comprises an operational amplifier power supply voltage V0 at a non-inverting input end and an inverting input end which is grounded;
the resistance value of the fifth resistor R5 is the same as that of the thirteenth resistor R13, the resistance value of the seventh resistor R7 is the same as that of the fifteenth resistor R15, and the amplification factor of the current sampling amplification circuit is the fifth resistor R5/the seventh resistor R7.
The voltage at the two ends of the sampling resistor R10 is amplified through sampling, and is divided by the fourteenth resistor R14 and the seventeenth resistor R17, and then the output voltage is connected to the hysteresis comparison circuit.
The connections between the electronic components in the hysteresis comparison circuit are as follows:
the eleventh resistor R11 and the twelfth resistor R12 are connected in series between the non-inverting input end of the comparator U1 and the output end of the operational amplifier U2;
one end of the fifth capacitor C5 is connected to the output end of the comparator U1, and the other end of the fifth capacitor C is grounded;
the fourth resistor R4 and the third capacitor C3 are connected in parallel to the reverse input end of the comparator U1, and the other ends of the fourth resistor R4 and the third capacitor C3 are connected in parallel to the ground;
the eighth resistor R8 and the first capacitor C1 are connected in series with the reverse input end of the comparator U1, and the other end of the first capacitor C1 is grounded;
the ninth resistor R9 is connected between the output end of the comparator U1 and the base electrode of the third triode Q3;
the emitting electrode of the third triode Q3 is grounded, and the collecting electrode is connected with a control signal DO;
the sixth resistor R6 is connected to the base electrode of the third triode Q3, and the other end of the sixth resistor R6 is connected with a base electrode voltage V1;
the in-phase input end of the comparator U1 is connected with an operational amplifier power supply voltage V0, and the reverse-phase input end is grounded; a voltage stabilizing diode D1 is connected between the non-inverting input end and the output end of the comparator U1.
The hysteresis comparison circuit amplifies voltage generated by current of the sampling resistor R10, divides the voltage by the fourteenth resistor R14 and the seventeenth resistor R17, outputs the voltage through the eleventh resistor R11 and the twelfth resistor R12 to obtain V +, and when the V + is smaller than the V-, the comparator U1 outputs low level, the third triode Q3 is not conducted, and the control circuit of the high-side PMOS tube Q1 is not influenced.
When V + is larger than V-, the comparator U1 outputs high level, the voltage-stabilizing diode D1 and the third triode Q3 are conducted, the input voltage of the second triode Q2 is smaller than the conduction voltage, so that the second triode is not conducted, the high-side PMOS tube Q1 is turned off and output, the output of the operational amplifier U2 is about 0V, a proper sixth resistor R6 and a proper eleventh resistor R11 are selected, at the moment, the V + of the comparator U1 is still larger than V-, the output is high, and the high-side PMOS tube Q1 keeps the turn-off state; therefore, once the current exceeds the set value, the high-side PMOS transistor Q1 will remain off, and the circuit will no longer output.
The second triode Q2 and the third triode Q3 are both NPN type triodes, the NPN type triode is a triode formed by clamping a P type semiconductor between two N type semiconductors, is also called a crystal triode and is the most important device in an electronic circuit; the main functions of the NPN type triode are current amplification and switching action, and the NPN type triode can convert weak electric signals into signals with certain intensity.
To sum up, the high-side output protection circuit with current monitoring of the utility model has reasonable design, controls output to be turned off when the output current is larger than a set value through the current sampling amplifying circuit and the hysteresis comparison circuit which are arranged on the high-side output driving circuit and are matched for application, thereby realizing the functions of high-side output circuit protection and current monitoring; the hysteresis comparison circuit has a turn-off holding function, and when the circuit current exceeds a set value, the PMOS keeps a turn-off state and is not controlled by input, so that the protection effect on the high-side circuit is enhanced; the protection circuit only uses conventional components such as an operational amplifier, a comparator, a triode and the like, the manufacturing and using cost is low, and devices of the protection circuit can be completely made into a home, so that the protection circuit is beneficial to large-scale popularization and use. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A high-side output protection circuit with current monitoring comprises a main input end Vin, a main output end Vout and a control signal DO;
the high-side output protection circuit is characterized by further comprising a high-side output driving circuit, a current sampling amplifying circuit and a hysteresis comparison circuit;
the high-side output driving circuit comprises a high-side PMOS (P-channel metal oxide semiconductor) tube Q1, a second triode Q2, a first resistor R1, a second resistor R2 and a third resistor R3; the high-side output driving circuit is connected with a main input end Vin through a high-side PMOS (P-channel metal oxide semiconductor) tube Q1 and is connected with a control signal DO through a second triode Q2;
the current sampling amplifying circuit comprises a sampling resistor R10, an operational amplifier U2, a fifth resistor R5, a seventh resistor R7, a second capacitor C2, a thirteenth resistor R13, a fifteenth resistor R15, a sixth capacitor C6, a fourteenth resistor R14, a seventeenth resistor R17 and a fourth capacitor C4; the sampling resistor R10 is connected in parallel between the high-side PMOS tube Q1 and the main output end Vout, so that the current sampling amplifying circuit is connected with the high-side output driving circuit and the main output end Vout;
the hysteresis comparison circuit comprises a comparator U1, an eleventh resistor R11, a twelfth resistor R12, a fifth capacitor C5, a fourth resistor R4, a third capacitor C3, an eighth resistor R8, a first capacitor C1, a sixth resistor R6, a ninth resistor R9 and a third triode Q3; the hysteresis comparison circuit is connected with the operational amplifier U2 through the comparator U1 so as to be connected with the current sampling amplification circuit, and is connected with the control signal DO through the third triode Q3.
2. The high-side output protection circuit with current monitoring of claim 1, wherein the connections between electronic components in the high-side output driving circuit are as follows:
the source electrode of the high-side PMOS tube Q1 is connected with the main input end Vin, and the grid electrode of the high-side PMOS tube Q1 is connected with the collector electrode of the second triode Q2;
the second resistor R2 is connected in parallel between the grid and the source of the high-side PMOS tube Q1;
the base electrode of the second triode Q2 is connected with a control signal DO, and the emitting electrode of the second triode Q2 is grounded;
the third resistor R3 is connected between the base electrode of the second triode Q2 and the control signal DO;
the first resistor R1 is connected between the emitter and the base of the second triode Q2.
3. The high-side output protection circuit with current monitoring of claim 2, wherein the connections between the electronic components in the current sampling amplifying circuit are as follows:
the fifth resistor R5 is connected between the inverting input end of the operational amplifier U2 and the drain electrode of the high-side PMOS tube Q1;
the seventh resistor R7 and the second capacitor C2 are connected in parallel between the inverting input end and the output end of the operational amplifier U2;
the thirteenth resistor R13 is connected between the non-inverting input end of the operational amplifier U2 and the main output end Vout;
the fifteenth resistor R15 and the sixth capacitor C6 are connected in parallel to the non-inverting input end of the operational amplifier U2, and the other ends of the fifteenth resistor R15 and the sixth capacitor C6 are connected in parallel to the ground;
the fourteenth resistor R14 is connected to the output end of the operational amplifier U2;
the seventeenth resistor R17 and the fourth capacitor C4 are connected in parallel to the output end of the operational amplifier U2, and the other ends of the seventeenth resistor R17 and the fourth capacitor C4 are connected in parallel to the ground;
the non-inverting input end of the operational amplifier U2 is operational amplifier power supply voltage V0, and the inverting input end of the operational amplifier U2 is grounded.
4. The high-side output protection circuit with current monitoring of claim 3, wherein the connections between the electronic components in the hysteresis comparator circuit are as follows:
the eleventh resistor R11 and the twelfth resistor R12 are connected in series between the non-inverting input end of the comparator U1 and the output end of the operational amplifier U2;
one end of the fifth capacitor C5 is connected to the output end of the comparator U1, and the other end of the fifth capacitor C is grounded;
the fourth resistor R4 and the third capacitor C3 are connected in parallel at the reverse input end of the comparator U1, and the other ends of the fourth resistor R4 and the third capacitor C3 are connected in parallel to the ground;
the eighth resistor R8 and the first capacitor C1 are connected in series at the reverse input end of the comparator U1, and the other end of the first capacitor C1 is grounded;
the ninth resistor R9 is connected between the output end of the comparator U1 and the base electrode of the third triode Q3;
the emitting electrode of the third triode Q3 is grounded, and the collecting electrode of the third triode Q3 is connected with a control signal DO;
the sixth resistor R6 is connected to the base electrode of the third triode Q3, and the other end of the sixth resistor R6 is connected with a base electrode voltage V1;
and the in-phase input end of the comparator U1 is connected with an operational amplifier power supply voltage V0, and the inverting input end of the comparator U1 is grounded.
5. The high-side output protection circuit with current monitoring of claim 4, wherein: the second triode Q2 and the third triode Q3 are both NPN type triodes.
6. The high-side output protection circuit with current monitoring of claim 5, wherein: the resistance value of the fifth resistor R5 is the same as that of the thirteenth resistor R13, the resistance value of the seventh resistor R7 is the same as that of the fifteenth resistor R15, and the amplification factor of the current sampling amplification circuit is the fifth resistor R5/the seventh resistor R7.
7. The high-side output protection circuit with current monitoring of claim 6, wherein: the fourteenth resistor R14 and the seventeenth resistor R17 are voltage dividing resistors.
8. The high-side output protection circuit with current monitoring of claim 1, wherein: and the main output end Vout is grounded, and a sixteenth resistor R16 is connected between the main output end Vout and the ground.
9. The high-side output protection circuit with current monitoring of claim 1, wherein: and a voltage stabilizing diode D1 is connected between the non-inverting input end and the output end of the comparator U1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222433697.4U CN218415793U (en) | 2022-09-14 | 2022-09-14 | High-side output protection circuit with current monitoring function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222433697.4U CN218415793U (en) | 2022-09-14 | 2022-09-14 | High-side output protection circuit with current monitoring function |
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| Publication Number | Publication Date |
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| CN218415793U true CN218415793U (en) | 2023-01-31 |
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| CN202222433697.4U Active CN218415793U (en) | 2022-09-14 | 2022-09-14 | High-side output protection circuit with current monitoring function |
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