A power supply output circuit

Abstract

The utility model relates to power supply circuit technical field, concretely relates to a power output circuit, including input port, grounding port and output port, still include triode Q1, triode Q2, resistance R3 and resistance R2, one end of resistance R2 is connected with input port, the other end of resistance R2 is connected with triode Q1's base and triode Q2's collector respectively, triode Q1's collector is connected with input port, triode Q1's emitter is connected with output port through resistance R3, triode Q2's emitter is connected with output port, triode Q2's base is connected with output port through resistance R3, still include dynamic adjustment module, the utility model discloses through setting dynamic adjustment module, and dynamic adjustment module can automatically adjust the overcurrent threshold of overcurrent protection trigger according to temperature, can carry out temperature and current collaborative protection, avoid the equipment under high temperature due to overcurrent damage, improve system reliability and adaptability.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, specifically to a power output circuit. Background Technology

[0002] During the operation of electronic devices, the stability and safety of the power supply circuit are crucial; therefore, overcurrent protection is an indispensable component of power supply circuits. Currently, most power supply circuits are equipped with overcurrent protection circuits, which can promptly cut off the circuit or take current-limiting measures when the current exceeds a preset threshold, effectively avoiding safety hazards such as equipment damage and fires caused by excessive current. However, existing power circuit overcurrent protection technologies have significant limitations. Their overcurrent protection current thresholds are typically fixed values ​​that are difficult to change once set. In real-world applications, the performance of electronic components changes with ambient temperature, and current overcurrent protection current thresholds cannot adapt to these temperature variations. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a power output circuit.

[0004] The objective of this utility model is achieved through the following technical solution: a power output circuit, including an input port, a ground port, and an output port; the power output circuit further includes transistors Q1 and Q2, resistors R3 and R2; one end of resistor R2 is connected to the input port; the other end of resistor R2 is connected to the base of transistor Q1 and the collector of transistor Q2 respectively; the collector of transistor Q1 is connected to the input port; the emitter of transistor Q1 is connected to the output port through resistor R3; the emitter of transistor Q2 is connected to the output port; the base of transistor Q2 is connected to the output port through resistor R3. The power output circuit also includes a dynamic adjustment module; the dynamic adjustment module is connected to the base of transistor Q2.

[0005] The present invention is further configured such that the dynamic adjustment module includes a thermistor, a resistor R1, a resistor R4, an operational amplifier U1, and a digital potentiometer U2; one end of the thermistor is connected to the input port; the other end of the thermistor is connected to one end of the resistor R1; and the other end of the resistor R1 is connected to the ground port. The positive input terminal of the operational amplifier U1 is connected to the other end of the thermistor; the negative input terminal of the operational amplifier U1 is connected to the reference voltage; the output terminal of the operational amplifier U1 is connected to the base of the transistor Q2 through the digital potentiometer U2.

[0006] The present invention is further configured such that one end of the fixed terminal of the digital potentiometer U2 is connected to the ground port; the other end of the fixed terminal of the digital potentiometer U2 is connected to the base of the transistor Q2 through the resistor R4; and the output terminal of the operational amplifier U1 is connected to the sliding terminal of the digital potentiometer U2.

[0007] The present invention is further configured such that the operational amplifier U1 is an LM358.

[0008] The present invention is further configured such that the model of the digital potentiometer U2 is X9C103S.

[0009] The present invention is further configured such that both transistor Q1 and transistor Q2 are NPN transistors.

[0010] The present invention is further configured such that the power output circuit includes a transistor Q3; the emitter of the transistor Q3 is grounded; the base of the transistor Q3 is connected to the other end of the thermistor; and the collector of the transistor Q3 is connected to the base of the transistor Q1.

[0011] The present invention is further configured such that the transistor Q3 is an NPN transistor. The beneficial effects of this invention are: by incorporating a dynamic adjustment module, the present invention can automatically adjust the overcurrent threshold triggered by overcurrent protection according to temperature, enabling coordinated temperature and current protection, preventing equipment damage due to overcurrent at high temperatures, and improving system reliability and adaptability. Attached Figure Description

[0012] Figure 1 This is the circuit schematic diagram of this utility model; Among them: 1. Input port; 2. Grounding port; 3. Output port; 4. Thermistor. Detailed Implementation

[0013] The present invention will be further described in conjunction with the following embodiments.

[0014] Depend on Figure 1As can be seen, the power output circuit described in this embodiment includes an input port 1, a ground port 2, and an output port 3; the power output circuit also includes transistors Q1 and Q2, resistors R3 and R2; one end of resistor R2 is connected to input port 1; the other end of resistor R2 is connected to the base of transistor Q1 and the collector of transistor Q2 respectively; the collector of transistor Q1 is connected to input port 1; the emitter of transistor Q1 is connected to output port 3 through resistor R3; the emitter of transistor Q2 is connected to output port 3; the base of transistor Q2 is connected to output port 3 through resistor R3; the power output circuit also includes a dynamic adjustment module; the dynamic adjustment module is connected to the base of transistor Q2.

[0015] Specifically, in the power output circuit described in this embodiment, when the load current is normal, the power supply at the input terminal, through resistor R2, causes transistor Q1 to be in a conducting state. At this time, input port 1, transistor Q1, resistor R3 and output port 3 are in a closed circuit. When the current is normal, the voltage at the base of transistor Q2 is insufficient to turn it on, so transistor Q2 remains in an off state, which does not affect the conduction of transistor Q1. The power supply at the input terminal can supply power to the load normally. When the load current is too high, the voltage at the base of transistor Q2 becomes too high, causing transistor Q2 to conduct. This reduces the voltage at the base of transistor Q1, causing transistor Q1 to turn off, thus cutting off the output to the load and providing overcurrent protection.

[0016] This embodiment incorporates a dynamic adjustment module that automatically adjusts the overcurrent threshold triggered by overcurrent protection based on temperature. This enables coordinated protection against both temperature and current, preventing equipment damage due to overcurrent at high temperatures and improving system reliability and adaptability.

[0017] This embodiment of a power output circuit includes a dynamic adjustment module comprising a thermistor 4, a resistor R1, a resistor R4, an operational amplifier U1, and a digital potentiometer U2. One end of the thermistor 4 is connected to input port 1; the other end of the thermistor 4 is connected to one end of resistor R1; the other end of resistor R1 is connected to ground port 2; the positive input terminal of the operational amplifier U1 is connected to the other end of the thermistor 4; the negative input terminal of the operational amplifier U1 is connected to a reference voltage; and the output terminal of the operational amplifier U1 is connected to the base of transistor Q2 via the digital potentiometer U2. In this embodiment of a power output circuit, one fixed end of the digital potentiometer U2 is connected to ground port 2; the other fixed end of the digital potentiometer U2 is connected to the base of transistor Q2 via resistor R4; and the output terminal of the operational amplifier U1 is connected to the sliding end of the digital potentiometer U2.

[0018] Specifically, thermistor 4 is a temperature-sensitive element whose resistance changes with temperature. Thermistor 4 and resistor R1 are connected in series to form a voltage divider circuit. When the temperature changes, the voltage at the voltage divider point connected to thermistor 4 and resistor R1 changes. This voltage signal is input to the positive input terminal of operational amplifier U1 as the raw signal for temperature detection. When the temperature changes, the voltage at the voltage divider point connected to thermistor 4 and resistor R1 changes. Operational amplifier U1 outputs a corresponding signal to the sliding terminal of digital potentiometer U2, thereby changing the resistance value of digital potentiometer U2. Together with resistor R3, this changes the base voltage of transistor Q2, allowing transistor Q2 to meet the conduction condition when the output current is relatively small (i.e., lowering the overcurrent protection trigger current threshold). Conversely, when the temperature is low, the overcurrent protection trigger threshold is increased, allowing a larger output current.

[0019] The power output circuit described in this embodiment uses an operational amplifier U1, model LM358. This configuration ensures a stable and reliable overall structure.

[0020] The power output circuit described in this embodiment uses a digital potentiometer U2, model X9C103S. This configuration ensures a stable and reliable overall structure.

[0021] In the power output circuit described in this embodiment, both transistors Q1 and Q2 are NPN transistors.

[0022] The power output circuit described in this embodiment further includes a transistor Q3; the emitter of transistor Q3 is grounded; the base of transistor Q3 is connected to the other end of the thermistor 4; and the collector of transistor Q3 is connected to the base of transistor Q1. In this embodiment, transistor Q3 is an NPN transistor.

[0023] Specifically, in this embodiment, through the above settings, when the temperature is too high, transistor Q3 is turned on, thereby reducing the voltage at the base of transistor Q1, causing transistor Q1 to turn off, thus cutting off the output to the load and playing the role of over-temperature protection.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A power output circuit, characterized in that: The circuit includes an input port (1), a ground port (2), and an output port (3); the power output circuit also includes transistors Q1 and Q2, resistors R3 and R2; one end of resistor R2 is connected to the input port (1); the other end of resistor R2 is connected to the base of transistor Q1 and the collector of transistor Q2 respectively; the collector of transistor Q1 is connected to the input port (1); the emitter of transistor Q1 is connected to the output port (3) through resistor R3; the emitter of transistor Q2 is connected to the output port (3); the base of transistor Q2 is connected to the output port (3) through resistor R3. The power output circuit also includes a dynamic adjustment module; the dynamic adjustment module is connected to the base of transistor Q2.

2. The power output circuit according to claim 1, characterized in that: The dynamic adjustment module includes a thermistor (4), a resistor R1, a resistor R4, an operational amplifier U1, and a digital potentiometer U2; one end of the thermistor (4) is connected to the input port (1); the other end of the thermistor (4) is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the ground port (2); The positive input terminal of the operational amplifier U1 is connected to the other end of the thermistor (4); the negative input terminal of the operational amplifier U1 is connected to the reference voltage; the output terminal of the operational amplifier U1 is connected to the base of the transistor Q2 through the digital potentiometer U2.

3. A power output circuit according to claim 2, characterized in that: One end of the fixed terminal of the digital potentiometer U2 is connected to the ground port (2); the other end of the fixed terminal of the digital potentiometer U2 is connected to the base of the transistor Q2 through the resistor R4; the output terminal of the operational amplifier U1 is connected to the sliding terminal of the digital potentiometer U2.

4. A power output circuit according to claim 2, characterized in that: The operational amplifier U1 is model LM358.

5. A power output circuit according to claim 2, characterized in that: The digital potentiometer U2 is model X9C103S.

6. A power output circuit according to claim 1, characterized in that: Both transistors Q1 and Q2 are NPN transistors.

7. A power output circuit according to claim 2, characterized in that: The power output circuit also includes a transistor Q3; the emitter of the transistor Q3 is grounded; the base of the transistor Q3 is connected to the other end of the thermistor (4); and the collector of the transistor Q3 is connected to the base of the transistor Q1.

8. A power output circuit according to claim 7, characterized in that: The transistor Q3 is an NPN transistor.

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