Voltage stabilizing integrated circuit

Abstract

The utility model relates to the technical field of integrated circuits, and discloses a voltage-stabilizing integrated circuit in order to solve the technical problem that a voltage-stabilizing circuit is insufficient in precision and stability, the input end of the voltage-stabilizing integrated circuit is respectively connected with the emitting electrode of a triode Q6 and the emitting electrode of a triode Q8, the emitting electrode of the triode Q6 is connected with the base electrode of the triode Q8, and the base electrode of the triode Q8 is connected with the base electrode of the triode Q6. A power resistor R13 is connected between the collector of the triode Q8 and the collector of the triode Q6; a series voltage division circuit is arranged, an intermediate node is connected with an in-phase input end of an operational amplifier U11, and an output end of the operational amplifier U11 is connected with a base electrode of a triode Q6; the in-phase input end of the operational amplifier U4 is connected with the collector electrode of the triode Q6, and the inverted input end of the operational amplifier U4 and the collector electrode of the triode Q6 are connected with an adjustable resistor R16; and a clamping circuit is arranged between the output end of the operational amplifier U4 and the collector electrode of the triode Q6. The operational amplifier U4 and the adjustable resistor R16 accurately control the current, and the clamping circuit limits the voltage range, so that the stable output of the circuit under different load conditions is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, in particular to a voltage-stabilizing integrated circuit. Background Art

[0002] Voltage regulator integrated circuits play a vital role in modern electronic devices and are widely used in various occasions to provide stable power output to ensure that the equipment can work properly. Whether in consumer electronics, industrial control systems, or in communication equipment and medical instruments, voltage regulator circuits are essential components. However, traditional voltage regulator integrated circuits have some significant problems in practical applications, which limit their performance and reliability in certain fields.

[0003] First, the lack of stability and precision is one of the main defects of traditional voltage stabilization circuits. When the load changes, the output voltage of traditional voltage stabilization circuits tends to fluctuate. This fluctuation may have an adverse effect on the stability and accuracy of the power supply, especially in some high-precision applications, such as precision measurement equipment and high-performance computer systems, where a small fluctuation in the output voltage may also cause equipment performance degradation or even failure. This instability not only affects the normal operation of the equipment, but may also shorten its service life.

[0004] Secondly, limited current driving capability is also a major shortcoming of traditional voltage stabilization integrated circuits. The design output current capability of many voltage stabilization circuits is relatively limited, making it difficult to meet applications with high current requirements. For example, in high-power applications such as high-power LED driving and motor control, the current output capability of traditional voltage stabilization circuits is insufficient to ensure the normal operation of the equipment. This not only limits the application scope of voltage stabilization circuits, but also forces designers to face more restrictions and challenges when choosing circuit solutions.

[0005] In addition, in order to achieve higher voltage regulation accuracy and current driving capability, traditional voltage regulation circuits often require complex component configurations to be added outside the circuit. These external components may include multiple voltage divider resistors, compensation capacitors, etc. This complex component requirement not only increases the complexity of circuit design, but also occupies more PCB space, increasing manufacturing costs. In some space-constrained applications, such as portable electronic devices, this design complexity and space occupancy problem is particularly prominent.

[0006] In summary, traditional voltage-stabilizing integrated circuits have many problems in terms of stability, accuracy, current driving capability, and external component requirements, making them incompetent in high-precision, high-stability, and high-current applications. As electronic equipment's requirements for power performance continue to increase, there is an urgent need to develop a new voltage-stabilizing integrated circuit that can provide more stable output voltage and current, with stronger driving capability and higher reliability to meet the high requirements of modern electronic equipment for power. Utility Model Content

[0007] The utility model aims to provide a voltage stabilizing integrated circuit to solve the technical problem of insufficient precision and stability of the voltage stabilizing circuit.

[0008] To achieve the above purpose, the specific technical solution of a voltage-stabilizing integrated circuit of the utility model is as follows:

[0009] A voltage stabilizing integrated circuit comprises a transistor Q6, a transistor Q8, an operational amplifier U4 and an operational amplifier U11. The transistor Q6 and the transistor Q8 are PNP transistors. The collector of the transistor Q6 is used as the output end of the voltage stabilizing integrated circuit. The input end of the voltage stabilizing integrated circuit is respectively connected to the emitters of the transistor Q6 and the transistor Q8. The emitter of the transistor Q6 is connected to the base of the transistor Q8. A power resistor R is connected between the collector of the transistor Q8 and the collector of the transistor Q6. 13; a series voltage divider circuit is provided for obtaining a voltage from the collector of the transistor Q6, the middle node of the series voltage divider circuit is connected to the non-inverting input terminal of the operational amplifier U11, and the output terminal of the operational amplifier U11 is connected to the base of the transistor Q6; the non-inverting input terminal of the operational amplifier U4 is connected to the collector of the transistor Q6, and an adjustable resistor R16 is provided between the inverting input terminal of the operational amplifier U4 and the collector of the transistor Q6; a clamping circuit is provided between the output terminal of the operational amplifier U4 and the collector of the transistor Q6.

[0010] First, the in-phase input of the op amp U11 obtains the intermediate voltage through the series voltage divider circuit and compares it with the inverting input to ensure the stability of the output voltage. At the same time, the base of the transistor Q6 is precisely controlled to maintain a stable output voltage. Secondly, the configuration of the transistor Q8 enhances the current driving capability of the circuit, enabling the circuit to meet larger current requirements while protecting Q6 from excessive current. The adjustable resistor R16 of the op amp U4 allows the current to be precisely adjusted. By adjusting R16, the voltage at the inverting input can be precisely controlled, and then the conduction state of Q6 can be adjusted to achieve precise current regulation. The clamping circuit effectively limits the voltage from exceeding the set range, prevents excessive voltage from damaging the circuit components, and improves the safety and reliability of the circuit. The combination of the op amp U4 and the clamping circuit enhances the stability of the circuit, prevents abnormal fluctuations in voltage or current, and improves the response speed and stability of the circuit. Through the built-in feedback mechanism and clamping circuit, the design reduces the dependence on external components, simplifies the circuit design, reduces the need for external adjustment resistors, and saves PCB space and cost. In general, this voltage regulator integrated circuit can provide stable output voltage and precise current control, enhance current driving capability, and has effective overvoltage protection. It is suitable for applications with high requirements on voltage stability and current accuracy.

[0011] Furthermore, the non-inverting input terminal of the operational amplifier U4 is grounded through the resistor R11 and the adjustable resistor R6 in sequence; the inverting input terminal is grounded through the resistor R10, the resistor R12, and the adjustable resistor R6 in sequence.

[0012] The non-inverting input of op amp U4 is connected to ground through resistor R11 and adjustable resistor R6 in sequence, while the inverting input is connected to ground through resistor R10, resistor R12, and adjustable resistor R6 in sequence. This configuration allows the input voltage of op amp U4 to be precisely controlled by adjusting adjustable resistor R6. Adjusting R6 can balance the voltages at the non-inverting and inverting inputs, allowing op amp U4 to accurately compare the input voltage to the reference voltage and maintain a stable output voltage through a feedback mechanism. This setup improves the accuracy and stability of the circuit, making current and voltage control more reliable.

[0013] Furthermore, the series voltage divider circuit includes a resistor R6 and a resistor R7, one end of the resistor R6 is connected to the collector of the transistor Q6, and the other end of the resistor R6 is connected to one end of the resistor R7.

[0014] Furthermore, the clamping circuit includes a diode D3, a diode D4 and a resistor R8, the anode of the diode D3 is connected to the other end of the resistor R7, the cathode of the diode D3 is connected to the collector of the transistor Q6 through the resistor R8, the cathode of the diode D3 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to the output end of the operational amplifier U4.

[0015] The diodes D3 and D4 can effectively limit the voltage range in the circuit, preventing the voltage from exceeding the preset safety range, thereby protecting the circuit components and ensuring the stability and reliability of the voltage stabilization circuit.

[0016] The voltage stabilizing integrated circuit provided by the utility model has the following advantages:

[0017] The op amp U11 compares the intermediate voltage obtained by the series voltage divider circuit with the inverting input terminal to ensure the stability of the output voltage. At the same time, it precisely controls the base of the transistor Q6 to maintain a stable output voltage. The configuration of the transistor Q8 enhances the current driving capability of the circuit, enabling it to meet the needs of larger currents and effectively protect Q6 from excessive currents. The adjustable resistor R16 of the op amp U4 provides a precise current regulation function. By adjusting R16, the voltage at the inverting input terminal can be precisely controlled, thereby adjusting the conduction state of Q6 and achieving fine control of the current. The clamping circuit prevents damage to the circuit components by excessive voltage by limiting the voltage within the set range, thereby improving the safety and reliability of the circuit. The combination of the op amp U4 and the clamping circuit further enhances the stability of the circuit, avoids abnormal fluctuations in voltage or current, and improves the response speed and stability of the circuit. The overall design reduces the need for external components, simplifies the circuit design, and saves PCB space and cost through the built-in feedback mechanism and clamping circuit. Therefore, the voltage-stabilizing integrated circuit can provide a stable output voltage and precise current control, and has a strong current driving capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A simplified diagram of the internal structure of the voltage-stabilizing integrated circuit provided by the utility model;

[0019] Figure 2 This is a circuit diagram of an adjustable resistor connected to an adjustment port provided by the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] See also Figure 1The utility model provides a voltage-stabilizing integrated circuit for outputting a constant-current voltage-stabilizing power supply. The figure is a simplified diagram of the internal circuit structure of the integrated circuit, including a transistor Q6, a transistor Q8, an operational amplifier U4 and an operational amplifier U11. The transistor Q6 and the transistor Q8 are both PNP transistors. The inverting input terminal of the operational amplifier U11 is provided with a reference voltage. The output terminal of the operational amplifier U11 is connected to the base of the transistor Q6. The collector of the transistor Q6 serves as the power output terminal of the voltage-stabilizing integrated circuit. The collector of the transistor Q6 is connected to a virtual ground (the ground plane potential is adjustable) through a series voltage-dividing circuit. The series voltage-dividing circuit includes a resistor R6 and a resistor R7. One end of the resistor R6 is connected to the collector of the transistor Q6. The other end of the resistor R6 is connected to one end of the resistor R7. The intermediate node of the resistor R6 and the resistor R7 is connected to the non-inverting input terminal of the operational amplifier U11. The collector of transistor Q8 is connected to the collector of transistor Q6 through resistor R13. Resistor R13 is a power resistor with a resistance less than 1 ohm so that a larger current can flow through it.

[0022] The inverting input of the operational amplifier U11 is connected to the external reference voltage REF, while the non-inverting input is connected to the series voltage divider circuit, forming a stable reference voltage as the reference voltage source of the entire circuit, ensuring accurate control of the output voltage and current.

[0023] The base of transistor Q6 is biased by the resistor R6 and resistor R7 voltage divider network. When the input voltage VIN is applied to the emitter of transistor Q6 through R14, the current flowing out of the collector of transistor Q6 is controlled by its base voltage, thereby regulating the current flowing through the circuit. The conduction state of transistor Q6 determines the size of the output current and ensures the constant current.

[0024] The base of transistor Q8 is directly connected to the emitter of Q6, so that the current output capability of transistor Q6 can be amplified through the common emitter configuration. Transistor Q8 can provide greater current driving capability while also ensuring that transistor Q6 is not affected by excessive current.

[0025] The external input power source VIN is connected to the emitter of the transistor Q6 through the resistor R14.

[0026] The base of the transistor Q8 is connected to the emitter of the transistor Q6 , the external input power VIN is input to the emitter of the transistor Q8 , and the emitter of the transistor Q8 is grounded through the resistor R15 .

[0027] An XX circuit is provided, the anode of the diode D3 is connected to the other end of the resistor R7, the cathode of the diode D3 is connected to the collector of the transistor Q6 through the resistor R8, the cathode of the diode D3 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to the output end of the operational amplifier U4.

[0028] The first terminal of the operational amplifier U4 is the compensation input terminal, which is used to adjust the frequency response of the amplifier; the sixth terminal of the operational amplifier U4 is the external zero adjustment terminal, which is used to adjust the offset voltage of the operational amplifier. The compensation input terminal is connected to the external zero adjustment terminal through the compensation capacitor C4 to improve the stability and frequency response characteristics of the operational amplifier; the external zero adjustment terminal is connected to the collector of the transistor Q6 through the diode D5, the anode of the diode D5 is connected to the external zero adjustment terminal, and the cathode of the diode D5 is connected to the collector of the transistor Q6. The feedback function of the diode D5 not only stabilizes the output, but also protects the operational amplifier U4 from excessive current shock.

[0029] The 4th terminal of the operational amplifier U4 is the inverting input terminal, and the 5th terminal of the operational amplifier U4 is the non-inverting input terminal. The inverting input terminal is connected to the non-inverting input terminal through resistor R10, resistor R12, and resistor R11 in sequence;

[0030] The collector of transistor Q6 is connected to the non-inverting input terminal of operational amplifier U4, and the non-inverting input terminal of operational amplifier U4 is grounded through resistor R11 and capacitor C6 in sequence;

[0031] The inverting input terminal is connected to the output terminal through capacitor C5. The inverting input terminal is connected to the collector of transistor Q8 through capacitor C8.

[0032] The second terminal of the operational amplifier U4 is the positive terminal of the power supply, the seventh terminal of the operational amplifier U4 is the negative terminal of the power supply; the third terminal of the operational amplifier U4 is the output terminal.

[0033] The collector of the transistor Q6 serves as the output terminal of the voltage stabilizing integrated circuit and is output through the VOUT port. The collector of the transistor Q6 is grounded through the capacitor C7.

[0034] Combination Figure 2 The collector of transistor Q8 and the inverting input terminal of operational amplifier U4 are connected with an adjustable resistor R16, and the non-inverting input terminal of operational amplifier U4 is grounded through resistor R11 and adjustable resistor R9 in sequence.

[0035] The voltage-stabilizing integrated circuit provided by the utility model is further optimized to generate a stable reference voltage through the operational amplifier U11. By setting an adjustment resistor externally, the voltage of the inverting input terminal can be adjusted through the adjustable resistor R9. In this way, the operational amplifier U4 constitutes a voltage comparator. When there is a difference between the input voltage of U4 and the reference voltage, U4 will adjust its output voltage, thereby controlling the conduction state of the transistor Q6 and the transistor Q8, and then adjusting the output current and voltage, providing sufficient current driving capability, while ensuring the safety and stability of the circuit.

[0036] The implementation of the utility model provides a voltage-stabilizing integrated circuit that brings the following beneficial effects:

[0037] The op amp U11 compares the intermediate voltage obtained by the series voltage divider circuit with the inverting input terminal to ensure the stability of the output voltage. At the same time, it precisely controls the base of the transistor Q6 to maintain a stable output voltage. The configuration of the transistor Q8 enhances the current driving capability of the circuit, enabling it to meet the needs of larger currents and effectively protect Q6 from excessive currents. The adjustable resistor R16 of the op amp U4 provides a precise current regulation function. By adjusting R16, the voltage at the inverting input terminal can be precisely controlled, thereby adjusting the conduction state of Q6 and achieving fine control of the current. The clamping circuit prevents damage to the circuit components by excessive voltage by limiting the voltage within the set range, thereby improving the safety and reliability of the circuit. The combination of the op amp U4 and the clamping circuit further enhances the stability of the circuit, avoids abnormal fluctuations in voltage or current, and improves the response speed and stability of the circuit. The overall design reduces the need for external components, simplifies the circuit design, and saves PCB space and cost through the built-in feedback mechanism and clamping circuit. Therefore, the voltage regulator integrated circuit can provide stable output voltage and precise current control, has strong current driving capability and effective overvoltage protection, and is very suitable for applications with high requirements on voltage stability and current accuracy.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A voltage stabilizing integrated circuit, comprising a transistor Q6, a transistor Q8, an operational amplifier U4 and an operational amplifier U11, characterized in that: The transistors Q6 and Q8 are PNP transistors, the collector of the transistor Q6 is used as the output end of the voltage stabilizing integrated circuit, the input end of the voltage stabilizing integrated circuit is respectively connected to the emitters of the transistors Q6 and Q8, the emitter of the transistor Q6 is connected to the base of the transistor Q8, and a power resistor R13 is connected between the collector of the transistor Q8 and the collector of the transistor Q6; a series voltage divider circuit is provided for obtaining voltage from the collector of the transistor Q6, the middle node of the series voltage divider circuit is connected to the in-phase input end of the operational amplifier U11, and the output end of the operational amplifier U11 is connected to the base of the transistor Q6; the in-phase input end of the operational amplifier U4 is connected to the collector of the transistor Q6, and an adjustable resistor R16 is provided between the inverting input end of the operational amplifier U4 and the collector of the transistor Q6; a clamping circuit is provided between the output end of the operational amplifier U4 and the collector of the transistor Q6.

2. The voltage-stabilizing integrated circuit according to claim 1, characterized in that: The non-inverting input terminal of the operational amplifier U4 is connected to ground through the resistor R11 and the adjustable resistor R6 in sequence; The inverting input terminal is connected to ground via resistor R10, resistor R12 and adjustable resistor R6 in sequence.

3. The voltage-stabilizing integrated circuit according to claim 2, characterized in that: The series voltage divider circuit includes a resistor R6 and a resistor R7. One end of the resistor R6 is connected to the collector of the transistor Q6, and the other end of the resistor R6 is connected to one end of the resistor R7.

4. The voltage-stabilizing integrated circuit according to claim 3, characterized in that: The clamping circuit includes a diode D3, a diode D4 and a resistor R8, the anode of the diode D3 is connected to the other end of the resistor R7, the cathode of the diode D3 is connected to the collector of the transistor Q6 through the resistor R8, the cathode of the diode D3 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to the output end of the operational amplifier U4.

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