CN219498944U - High side protection circuit - Google Patents
High side protection circuit Download PDFInfo
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- CN219498944U CN219498944U CN202221458971.7U CN202221458971U CN219498944U CN 219498944 U CN219498944 U CN 219498944U CN 202221458971 U CN202221458971 U CN 202221458971U CN 219498944 U CN219498944 U CN 219498944U
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Abstract
The utility model discloses a high-side protection circuit, which relates to the field of integrated circuit design, and comprises: the power supply unit is used for supplying power and outputting the power to the starting unit, the current limiting unit and the logic unit; the starting unit is used as a starting end of the power switch unit and used for controlling whether the power switch unit works or not; the power switch unit is used for controlling the opening and closing of the load; the current limiting unit is used for preventing and protecting the power switch unit through the logic unit when the load changes; the logic unit is used for changing the conduction amplitude of the power switch unit; compared with the prior art, the utility model has the beneficial effects that: when the load is short-circuited or overloaded, the voltage at the load can be changed by matching the power switch unit, the current limiting unit and the logic unit, and the protection circuits in the short-circuit and overload are combined together, so that the circuit is simpler and has small volume.
Description
Technical Field
The utility model relates to the field of integrated circuit design, in particular to a high-side protection circuit.
Background
The high-side switch is a high-voltage side switch, and is normally isolated due to the fact that the high-voltage side switch is high in voltage, and the high-voltage switch can be controlled by connecting the relay to safety as long as the on-off of the relay is controlled, and the switch for controlling the relay is the low-side switch.
In the existing high-side circuit, a protection circuit is often arranged, but the existing protection circuit is too complex and needs to be improved.
Disclosure of Invention
The present utility model is directed to a high-side protection circuit, which solves the above-mentioned problems of the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a high side protection circuit comprising:
the power supply unit is used for supplying power and outputting the power to the starting unit, the current limiting unit and the logic unit;
the starting unit is used as a starting end of the power switch unit and used for controlling whether the power switch unit works or not;
the power switch unit is used for controlling the opening and closing of the load;
the current limiting unit is used for preventing and protecting the power switch unit through the logic unit when the load changes;
the logic unit is used for changing the conduction amplitude of the power switch unit;
the power supply unit is connected with the starting unit, the current limiting unit and the logic unit, the starting unit is connected with the power switch unit and the logic unit, the current limiting unit is connected with the logic unit and the power switch unit, and the logic unit is connected with the power switch unit.
As still further aspects of the utility model: the starting unit comprises a resistor R8, a resistor R10, a resistor R11, a triode Q3 and a capacitor C1, wherein one end of the resistor R8 is connected with the resistor R10 and a power supply unit, the other end of the resistor R8 is connected with an emitter of the triode Q3, a base electrode of the triode Q3 is connected with the other end of the resistor R10 and the resistor R11, the resistor R11 is connected with an input signal, a collector electrode of the triode Q3 is connected with the capacitor C1 and a logic unit, and the other end of the capacitor C1 is connected with a power switch unit.
As still further aspects of the utility model: the power switch unit comprises a resistor R9, a triode Q4, a resistor R5, a resistor R7, a resistor R4 and a MOS tube Q1, wherein the base electrode of the triode Q4 is connected with the resistor R9, a starting unit, a logic unit and the resistor R5, the other end of the resistor R9 is grounded, the emitter electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with the resistor R7, the other end of the resistor R7 is connected with the resistor R4 and the G electrode of the MOS tube Q1, the S electrode of the MOS tube Q1 is connected with the other end of the resistor R4 and the current limiting unit, the D electrode of the MOS tube Q1 is connected with the other end of the resistor R5, a load and a transient suppression diode TV1, and the other end of the transient suppression diode TV1 is grounded.
As still further aspects of the utility model: the current limiting unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R6 and a triode Q2, wherein one end of the resistor R1 is connected with the resistor R2, the resistor R3, an emitter of the triode Q2 and a power supply unit, a base electrode of the triode Q2 is connected with the resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R1, the other end of the resistor R2, the other end of the resistor R3 and a power switch unit, and a collector of the triode Q2 is connected with a logic unit.
As still further aspects of the utility model: the logic unit comprises a resistor R12, a resistor R15, a triode Q6, a triode Q5, a resistor R14, a resistor R16, a triode Q7, a resistor R17 and a resistor R13, wherein one end of the resistor R12 is connected with the current limiting unit, the other end of the resistor R12 is connected with a base electrode of the triode Q6 and the resistor R15, the other end of the resistor R15 is grounded, an emitting electrode of the triode Q6 is grounded, a collecting electrode of the triode Q6 is connected with a power switch unit and a collecting electrode of the triode Q5, the emitting electrode of the triode Q5 is grounded, a base electrode of the triode Q5 is connected with the resistor R14, the resistor R16 and the collecting electrode of the triode Q7, the other end of the resistor R16 is grounded, the other end of the resistor R14 is connected with a power supply unit, the emitting electrode of the triode Q7 is grounded, the base electrode of the triode Q7 is connected with the resistor R13, the other end of the resistor R17 is grounded, and the other end of the resistor R13 is connected with a starting unit.
Compared with the prior art, the utility model has the beneficial effects that: when the load is short-circuited or overloaded, the voltage at the load can be changed by matching the power switch unit, the current limiting unit and the logic unit, and the protection circuits in the short-circuit and overload are combined together, so that the circuit is simpler and has small volume.
Drawings
Fig. 1 is a circuit diagram of a high-side protection circuit.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, a high-side protection circuit includes:
the power supply unit is used for supplying power and outputting the power to the starting unit, the current limiting unit and the logic unit;
the starting unit is used as a starting end of the power switch unit and used for controlling whether the power switch unit works or not;
the power switch unit is used for controlling the opening and closing of the load;
the current limiting unit is used for preventing and protecting the power switch unit through the logic unit when the load changes;
the logic unit is used for changing the conduction amplitude of the power switch unit;
the power supply unit is connected with the starting unit, the current limiting unit and the logic unit, the starting unit is connected with the power switch unit and the logic unit, the current limiting unit is connected with the logic unit and the power switch unit, and the logic unit is connected with the power switch unit.
In this embodiment: referring to fig. 1, the starting unit includes a resistor R8, a resistor R10, a resistor R11, a transistor Q3, and a capacitor C1, wherein one end of the resistor R8 is connected to the resistor R10 and the power supply unit, the other end of the resistor R8 is connected to the emitter of the transistor Q3, the base of the transistor Q3 is connected to the other end of the resistor R10 and the resistor R11, the resistor R11 is connected to an input signal, the collector of the transistor Q3 is connected to the capacitor C1 and the logic unit, and the other end of the capacitor C1 is connected to the power switch unit.
When an input signal (a switch signal is in a low level) is input, the MOS tube Q3 is conducted, the power module outputs voltage to the power switch unit through the triode Q3, and the power switch unit starts to work.
In this embodiment: referring to fig. 1, the power switch unit includes a resistor R9, a triode Q4, a resistor R5, a resistor R7, a resistor R4, and a MOS transistor Q1, wherein a base electrode of the triode Q4 is connected to the resistor R9, a starting unit, a logic unit, and the resistor R5, another end of the resistor R9 is grounded, an emitter electrode of the triode Q4 is grounded, a collector electrode of the triode Q4 is connected to the resistor R7, another end of the resistor R7 is connected to the resistor R4 and a G electrode of the MOS transistor Q1, an S electrode of the MOS transistor Q1 is connected to the other end of the resistor R4, and a current limiting unit, a D electrode of the MOS transistor Q1 is connected to the other end of the resistor R5, a load, and a transient suppression diode TV1, and another end of the transient suppression diode TV1 is grounded.
When the starting unit inputs voltage, the triode Q4 is conducted to be grounded, so that the high level at the G pole of the MOS tube Q1 is changed into the low level, the MOS tube Q1 (PMOS tube) is conducted, the power supply unit supplies power to a load through the current limiting unit and the MOS tube Q1, and the load is electrified to work.
In this embodiment: referring to fig. 1, the current limiting unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R6, a triode Q2, wherein one end of the resistor R1 is connected with the resistor R2, the resistor R3, an emitter of the triode Q2, and a power supply unit, a base of the triode Q2 is connected with the resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R1, the other end of the resistor R2, the other end of the resistor R3, and a power switch unit, and a collector of the triode Q2 is connected with a logic unit.
When the load is in short circuit, the voltage at two ends of the load is zero, so that the G of the MOS tube Q4 is extremely low level, the MOS tube Q4 is cut off, the G of the MOS tube Q1 is extremely high level, the MOS tube Q1 is cut off, and the current limiting unit is not used for supplying power to the power switch unit.
In this embodiment: referring to fig. 1, the logic unit includes a resistor R12, a resistor R15, a transistor Q6, a transistor Q5, a resistor R14, a resistor R16, a transistor Q7, a resistor R17, and a resistor R13, wherein one end of the resistor R12 is connected to the current limiting unit, the other end of the resistor R12 is connected to the base of the transistor Q6, the resistor R15 is grounded, the other end of the resistor R15 is grounded, the emitter of the transistor Q6 is grounded, the collector of the transistor Q6 is connected to the power switching unit, the collector of the transistor Q5, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 is connected to the resistor R14, the resistor R16, the collector of the transistor Q7 is grounded, the other end of the resistor R14 is connected to the power supply unit, the emitter of the transistor Q7 is grounded, the base of the transistor Q7 is connected to the resistor R13, the resistor R17 is grounded, and the other end of the resistor R13 is connected to the starting unit.
When overload occurs at the load, the voltages of the resistors R1, R2 and R3 rise, when the voltages reach the threshold voltage of the base electrode of the triode Q2, the conduction time of the triode Q2 is prolonged, the cut-off time is shortened, the output voltage VDD of the power supply unit is conducted to the base electrode of the triode Q6 through the triode Q2 and the resistor R12, the voltage of the base electrode of the triode Q4 is pulled down, the conduction time of the triode Q4 is shortened, the cut-off time of the field effect tube Q1 is prolonged, the current is constant through repeated circulation, and the power switch unit is protected at the instant of electrifying the part of the circuit.
The working principle of the utility model is as follows: the power supply unit supplies power and outputs the power to the starting unit, the current limiting unit and the logic unit, the starting unit is used as a starting end of the power switch unit, controls whether the power switch unit works or not, the power switch unit controls the opening and closing of a load, and when the load changes, the current limiting unit prevents and protects the power switch unit through the logic unit, and the logic unit changes the conduction amplitude of the power switch unit.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. The utility model provides a high limit side protection circuit which characterized in that:
the high-side protection circuit includes:
the power supply unit is used for supplying power and outputting the power to the starting unit, the current limiting unit and the logic unit;
the starting unit is used as a starting end of the power switch unit and used for controlling whether the power switch unit works or not;
the power switch unit is used for controlling the opening and closing of the load;
the current limiting unit is used for preventing and protecting the power switch unit through the logic unit when the load changes;
the logic unit is used for changing the conduction amplitude of the power switch unit;
the power supply unit is connected with the starting unit, the current limiting unit and the logic unit, the starting unit is connected with the power switch unit and the logic unit, the current limiting unit is connected with the logic unit and the power switch unit, and the logic unit is connected with the power switch unit.
2. The high-side protection circuit according to claim 1, wherein the starting unit comprises a resistor R8, a resistor R10, a resistor R11, a triode Q3 and a capacitor C1, one end of the resistor R8 is connected with the resistor R10 and the power supply unit, the other end of the resistor R8 is connected with an emitter of the triode Q3, a base electrode of the triode Q3 is connected with the other end of the resistor R10, the resistor R11 is connected with an input signal, a collector electrode of the triode Q3 is connected with the capacitor C1 and the logic unit, and the other end of the capacitor C1 is connected with the power switch unit.
3. The high-side protection circuit according to claim 1, wherein the power switch unit comprises a resistor R9, a triode Q4, a resistor R5, a resistor R7, a resistor R4, a MOS transistor Q1, a base electrode of the triode Q4 is connected with the resistor R9, a starting unit, a logic unit and the resistor R5, the other end of the resistor R9 is grounded, an emitter electrode of the triode Q4 is grounded, a collector electrode of the triode Q4 is connected with the resistor R7, the other end of the resistor R7 is connected with the resistor R4 and a G electrode of the MOS transistor Q1, an S electrode of the MOS transistor Q1 is connected with the other end of the resistor R4 and the current limiting unit, a D electrode of the MOS transistor Q1 is connected with the other end of the resistor R5, a load and the other end of the transient suppression diode TV1 is grounded.
4. The high-side protection circuit according to claim 1, wherein the current limiting unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R6, a triode Q2, one end of the resistor R1 is connected with the resistor R2, the resistor R3, an emitter of the triode Q2, and a power supply unit, a base of the triode Q2 is connected with the resistor R6, the other end of the resistor R6 is connected with the other end of the resistor R1, the other end of the resistor R2, the other end of the resistor R3, and a power switch unit, and a collector of the triode Q2 is connected with a logic unit.
5. The high-side protection circuit according to claim 3, wherein the logic unit comprises a resistor R12, a resistor R15, a triode Q6, a triode Q5, a resistor R14, a resistor R16, a triode Q7, a resistor R17 and a resistor R13, one end of the resistor R12 is connected with the current limiting unit, the other end of the resistor R12 is connected with a base electrode of the triode Q6, the resistor R15, the other end of the resistor R15 is grounded, an emitter electrode of the triode Q6 is grounded, a collector electrode of the triode Q5 is connected with the power switching unit, an emitter electrode of the triode Q5 is grounded, a base electrode of the triode Q5 is connected with the resistor R14, the resistor R16 and a collector electrode of the triode Q7, the other end of the resistor R16 is grounded, the other end of the resistor R14 is grounded, the base electrode of the triode Q7 is connected with the resistor R13 and the resistor R17, the other end of the resistor R17 is grounded, and the other end of the resistor R13 is connected with the starting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221458971.7U CN219498944U (en) | 2022-06-13 | 2022-06-13 | High side protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221458971.7U CN219498944U (en) | 2022-06-13 | 2022-06-13 | High side protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219498944U true CN219498944U (en) | 2023-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221458971.7U Active CN219498944U (en) | 2022-06-13 | 2022-06-13 | High side protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219498944U (en) |
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2022
- 2022-06-13 CN CN202221458971.7U patent/CN219498944U/en active Active
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