Step-down regulator circuit

Abstract

The utility model relates to the technical field of step-down circuits, and discloses a step-down regulator circuit, which aims to solve the technical problems of poor stability and high cost in the conventional step-down circuit, and comprises an NPN-type triode Q6 and a PNP-type triode Q2, the collector electrode of the triode Q2 is connected with the power supply input end Vin; the base electrode of the triode Q2 is connected with the collector electrode of the triode Q6 through a first resistor R57; the base electrode of the triode Q2 is connected with the input power supply Vin through a second resistor R59; the base electrode of the triode Q6 is connected with an input power supply Vin through a third resistor R60; the emitting electrode of the triode Q6 is grounded through a first inductor L2 and a sixth resistor R56 in sequence; the emitter of the triode Q6 is connected with the collector of the triode Q2 through a second inductor L3; the collector electrode of the triode Q2 is connected with the cathode of a diode D11, and the anode of the diode D11 is grounded; and the triode Q6 outputs a power supply Vout after voltage reduction through the first inductor L2. And by adopting the design of discrete components, the cost is reduced, and the circuit stability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of voltage reduction circuit, and particularly relates to a voltage reduction type regulator circuit. BACKGROUND

[0002] With the continuous development of electronic equipment, the stability and voltage reduction efficiency of power supply become crucial technical requirements. Most of the existing voltage reduction type regulator circuits adopt integrated circuit (IC) design, which can achieve good voltage reduction effect, but the cost of these integrated circuits is high, especially in large-scale applications, the integrated circuits themselves need to be configured with discrete components, and the cost problem becomes particularly prominent.

[0003] In addition, the traditional voltage reduction regulator circuit is usually complex in circuit design and can generate excessive high-frequency noise, which interferes with the outside and has poor electromagnetic compatibility.

[0004] Due to the high cost of integrated circuits and the above technical problems, the existing voltage reduction type regulator circuit has great limitations in practical application and cannot meet the requirements of stability, low noise and low cost. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a voltage reduction type regulator circuit to solve the technical problems of poor stability and high cost in the existing voltage reduction circuit.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the voltage reduction type regulator circuit of the utility model is as follows:

[0007] A voltage reduction type regulator circuit comprises an NPN type transistor and a PNP type transistor; the collector of the transistor Q2 is used for connecting the power input end; the base of the transistor Q2 is connected with the collector of the transistor Q6 through the first resistor; the base of the transistor Q2 is connected with the input power through the second resistor; the base of the transistor Q6 is connected with the input power through the third resistor; the emitter of the transistor Q6 is grounded through the first capacitor; the emitter of the transistor Q6 is sequentially connected with the ground through the first inductor and the sixth resistor; the emitter of the transistor Q6 is connected with the collector of the transistor Q2 through the second inductor; the collector of the transistor Q2 is connected with the cathode of the diode, and the anode of the diode D11 is grounded; the transistor Q6 outputs the voltage-reduced power through the first inductor.

[0008] The base of the transistor Q6 is connected with the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode Z2 is grounded. The base of the transistor Q6 is sequentially connected with the collector of the transistor Q2 through the second capacitor and the fourth resistor. The base of the transistor Q6 is connected with the collector of the transistor Q2 through the fifth resistor.

[0009] The voltage reduction type regulator circuit provided by the utility model has the following advantages:

[0010] The buck regulator circuit provided by the utility model realizes the stable voltage reduction effect successfully by adopting the combination of NPN triode Q2 and PNP triode Q6, and the synergistic effect of inductors, resistors and capacitors. Compared with the traditional integrated circuit design, the circuit has obvious advantages in reducing cost, avoids the use of integrated circuits and complex peripheral components, reduces the overall system cost, and is especially suitable for large-scale applications. In addition, the design of the circuit is simple and effective, can reduce the interference of high-frequency noise, and improve the electromagnetic compatibility, so as to ensure the stability and efficiency of the output power supply. The introduction of diode D11 effectively prevents the influence of reverse current, improves the reliability and safety of the circuit. Overall, the circuit not only has cost advantages, but also meets the requirements of stability, low noise and high efficiency, and is suitable for various application occasions requiring stable voltage conversion and low noise. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The utility model provides a buck regulator circuit structure diagram. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the utility model is further described in detail below in combination with drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0013] Referring to Figure 1 The utility model provides a kind of buck regulator circuit, including NPN type triode Q6 and PNP type triode Q2, the collector of triode Q2 is used as power input end, the base of triode Q2 is connected with the collector of triode Q6 by resistance R57, the base of triode Q2 is connected with input power supply VCC by resistance R59, the base of triode Q6 is connected with input power supply VCC by resistance R60, the emitter of triode Q6 is grounded by capacitor C26, the emitter of triode Q6 is grounded by inductance L2 and resistance R56 in turn, the emitter of triode Q6 is connected with the collector of triode Q2 by inductance L3, the collector of triode Q2 is connected with the cathode of diode D11, and the anode of diode D11 is grounded.Triode Q6 is exported by inductance L2 after voltage reduction.

[0014] The base of triode Q6 is connected with the cathode of diode Z2, and the anode of diode Z2 is grounded.

[0015] The base of triode Q6 is connected with the collector of triode Q2 by capacitor C29 and resistance R58 in turn. The base of triode Q6 is connected with the collector of triode Q2 by resistance R61.

[0016] Working principle

[0017] The principle of voltage reduction of the circuit is mainly realized through the switching action of Q6 and Q2, and the specific process is as follows:

[0018] Initial state:

[0019] When the input power Vin is added to the circuit, the bases of transistors Q2 and Q6 obtain appropriate bias voltages through the bias network (resistors R59, R60), and enter the working state.

[0020] Switching regulation:

[0021] When Q6 is on, the input power Vin supplies power to inductors L2 and L3 through the path of Q2 and Q6, and the inductors start to store energy, and capacitors C26 and C27 filter current changes to reduce ripple.

[0022] When Q6 is off, the energy stored in inductors L2 and L3 is released to the output end through diode D11 to maintain the stability of the output voltage.

[0023] Feedback regulation:

[0024] Resistors R57, R58, R61 and capacitor C29 constitute a feedback network, which samples the output voltage in real time and adjusts the base voltage of Q6, thereby adjusting the on-time of Q6, so as to accurately control the output voltage.

[0025] Zener diode Z2 further stabilizes the base voltage of Q6, ensuring consistent output performance of the circuit under different input conditions.

[0026] Voltage reduction process:

[0027] By controlling the on and off time of Q6, the change of duty cycle adjusts the energy flowing from Vin to the output end, thereby realizing the voltage reduction function of the output voltage being lower than the input voltage.

[0028] The LC filter network formed by inductor L2 and capacitor C27 smooths the output current and further reduces the ripple.

[0029] In summary, the circuit utilizes the combined action of Q6 and Q2 to realize efficient and stable voltage reduction output through adjusting the switching duty cycle, and is suitable for various power management scenarios.

[0030] The voltage reduction regulator circuit has the following advantages:

[0031] The voltage reducing regulator circuit effectively realizes the stable voltage reduction of the input voltage by reasonably configuring the NPN type transistor Q2 and the PNP type transistor Q6, and the cooperation of inductors, resistors and capacitors. The cooperation of the transistors Q2 and Q6 ensures the stability and voltage reduction effect of the output power supply by filtering and regulating the input power supply through multiple inductors and resistors. The grounding effect of the capacitor further optimizes the stability of the circuit and reduces the interference of high-frequency noise on the output voltage. The introduction of the diode D11 also effectively prevents the influence of reverse current, ensuring the safety and reliability of the circuit. The overall design is simple and efficient, suitable for various occasions requiring stable voltage power supply, and improves the voltage reduction effect and energy conversion rate of the circuit.

[0032] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A step-down regulator circuit, characterized by comprising: A triode Q6 of NPN type and a triode Q2 of PNP type are included; The collector of the triode Q2 is used for connecting a power input terminal Vin; The base of the triode Q2 is connected with the collector of the triode Q6 through a first resistor R57; The base of the triode Q2 is connected with the input power Vin through a second resistor R59; The base of the triode Q6 is connected with the input power Vin through a third resistor R60; The emitter of the triode Q6 is grounded through a first capacitor C26; The emitter of the triode Q6 is grounded through a first inductor L2 and a sixth resistor R56 in sequence; The emitter of the triode Q6 is connected with the collector of the triode Q2 through a second inductor L3; The collector of the triode Q2 is connected with the cathode of a diode D11, and the anode of the diode D11 is grounded; The triode Q6 outputs a reduced voltage power Vout through the first inductor L2.

2. The step-down regulator circuit according to claim 1, wherein The base of the triode Q6 is connected with the cathode of a voltage stabilizing diode Z2, and the anode of the voltage stabilizing diode Z2 is grounded.

3. The step-down regulator circuit of claim 2, wherein, The base of the triode Q6 is connected with the collector of the triode Q2 through a second capacitor C29 and a fourth resistor R58 in sequence.

4. The step-down regulator circuit according to claim 3, wherein The base of the triode Q6 is connected with the collector of the triode Q2 through a fifth resistor R61.

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