Wide-voltage step-down circuit controlled by multiple signals

Abstract

The utility model discloses a wide voltage step-down circuit controlled by multiple signals, which relates to the field of switching power supplies and comprises a voltage input module used for inputting 12-100V direct current and providing voltage to be converted for a voltage conversion module; the starting control module is used for inputting a starting signal to the voltage conversion module and controlling the voltage conversion module to work; the voltage conversion module is used for converting the to-be-converted voltage into output voltage and outputting the output voltage; the feedback regulation module is used for detecting the output voltage of the voltage conversion module, acquiring the sampling voltage and feeding back the sampling voltage to the voltage conversion module to ensure that the output voltage is stable; the beneficial effects of the utility model are that the input voltage range is 12-100V direct current, the input voltage range is wide, a plurality of starting signals are arranged to control the circuit to work, the use scene can be greatly increased, the application range is wide, the output is controllable through the feedback regulation module, and the power loss is saved.

Description

Technical Field

[0001] The utility model relates to the field of switching power supplies, and particularly to a wide-voltage buck circuit with multi-signal control. Background Technique

[0002] With the continuous development of power electronic switching power supplies, the voltage of the DC primary power supply is also gradually increasing, which requires a buck circuit with wide-voltage input and adjustable and stable output to supply power to other low-voltage components.

[0003] The existing buck circuit has a narrow input voltage range and high limitations, and needs to be improved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a wide-voltage buck circuit with multi-signal control to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A wide-voltage buck circuit with multi-signal control includes:

[0007] A voltage input module for inputting 12 - 100V DC power to provide the voltage to be converted for the voltage conversion module;

[0008] A start control module for inputting a start signal to supply the voltage conversion module and controlling the operation of the voltage conversion module;

[0009] A voltage conversion module for converting the voltage to be converted into an output voltage for output;

[0010] A feedback regulation module for detecting the output voltage of the voltage conversion module, obtaining a sampled voltage, and feeding it back to the voltage conversion module to ensure the stability of the output voltage;

[0011] The voltage input module is connected to the voltage conversion module, the start control module is connected to the voltage conversion module, and the feedback regulation module is connected to the voltage conversion module.

[0012] As a further scheme of the utility model: The voltage input module includes capacitor C21, capacitor C22, and capacitor C23. One end of capacitor C21 is connected to one end of capacitor C22, one end of capacitor C23, voltage VIN++ (i.e., the input 12 - 100V DC power), the voltage conversion module, and the other end of capacitor C21 is grounded, the other end of capacitor C22 is grounded, and the other end of capacitor C23 is grounded.

[0013] As a further solution of the utility model: The start control module includes diode D12, diode D13, diode D6, resistor R39, resistor R65, resistor R64, and capacitor C27. The positive electrode of diode D12 is connected to the start signal AUTO-STARTUP, the positive electrode of diode D13 is connected to the start signal VCC, the positive electrode of diode D6 is connected to the start signal POWER_ON / OFF. The negative electrode of diode D12 is connected to the negative electrode of diode D13 and one end of resistor R39. The negative electrode of diode D6 is connected to one end of resistor R65. The other end of resistor R65 is connected to the other end of resistor R39, one end of resistor R64, one end of capacitor C27, and the voltage conversion module. The other end of resistor R64 is grounded, and the other end of capacitor C27 is grounded.

[0014] As a further solution of the utility model: The voltage conversion module includes chip U8, and the model of chip U8 is LA1823. The 3rd pin of chip U8 is connected to the voltage input module. The 7th pin of chip U8 is connected to the start control module. The 6th pin of chip U8 is grounded through resistor R37. The 8th pin of chip U8 is grounded. The 1st pin of chip U8 is connected to the feedback adjustment module. The 4th pin of chip U8 is connected to one end of capacitor C24. The 5th pin of chip U8 is connected to the other end of capacitor C24, the negative electrode of diode D8, and one end of inductor L11. The positive electrode of diode D8 is grounded. The other end of inductor L11 is connected to the feedback adjustment module, one end of capacitor C20, and one end of capacitor C19. The other end of capacitor C19 is grounded, and the other end of capacitor C20 is grounded.

[0015] As a further solution of the utility model: The feedback adjustment module includes resistor R35 and resistor R38. One end of resistor R35 is connected to the other end of inductor L11. The other end of resistor R35 is connected to one end of resistor R38 and the 1st pin of chip U8. The other end of resistor R38 is grounded.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: The input voltage range of the utility model is 12 - 100V DC, with a wide input voltage range. There are multiple start signal control circuits to make the circuit work, which can greatly increase the usage scenarios and has a wide application range. The output is controllable through the feedback adjustment module, saving power consumption. Description of the Drawings

[0017] Figure 1 It is a circuit diagram of a wide-voltage step-down circuit with multi-signal control. Detailed Embodiment

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1 , a wide-voltage step-down circuit with multi-signal control, comprising:

[0020] A voltage input module for inputting 12 - 100V direct current to provide the voltage to be converted for the voltage conversion module;

[0021] A start control module for inputting a start signal to supply the voltage conversion module and controlling the operation of the voltage conversion module;

[0022] A voltage conversion module for converting the voltage to be converted into an output voltage for output;

[0023] A feedback regulation module for detecting the output voltage of the voltage conversion module, obtaining a sampled voltage, and feeding it back to the voltage conversion module to ensure the stability of the output voltage;

[0024] The voltage input module is connected to the voltage conversion module, the start control module is connected to the voltage conversion module, and the feedback regulation module is connected to the voltage conversion module.

[0025] In this embodiment: Please refer to Figure 1 , the voltage input module includes capacitor C21, capacitor C22, and capacitor C23. One end of capacitor C21 is connected to one end of capacitor C22, one end of capacitor C23, voltage VIN++ (i.e., the input 12 - 100V direct current), and the voltage conversion module. The other end of capacitor C21 is grounded, the other end of capacitor C22 is grounded, and the other end of capacitor C23 is grounded.

[0026] The input 12 - 100V direct current is filtered and stabilized by capacitor C21, capacitor C22, and capacitor C23 to provide the voltage to be converted for the voltage conversion module.

[0027] In this embodiment: Please refer to Figure 1, the startup control module includes diode D12, diode D13, diode D6, resistor R39, resistor R65, resistor R64, and capacitor C27. The positive electrode of diode D12 is connected to the startup signal AUTO-STARTUP, the positive electrode of diode D13 is connected to the startup signal VCC, the positive electrode of diode D6 is connected to the startup signal POWER_ON / OFF. The negative electrode of diode D12 is connected to the negative electrode of diode D13 and one end of resistor R39. The negative electrode of diode D6 is connected to one end of resistor R65. The other end of resistor R65 is connected to the other end of resistor R39, one end of resistor R64, one end of capacitor C27, and the voltage conversion module. The other end of resistor R64 is grounded, and the other end of capacitor C27 is grounded.

[0028] When the voltages of the startup signals AUTO-STARTUP, VCC, and POWER_ON / OFF are greater than 1.2V, the voltage output to pin 7 of chip U8 is large enough to control the operation of chip U8. Diodes D12, D13, and D6 function to prevent other signals from being injected. Resistors R39, R65, R64, and capacitor C27 divide the voltage, limit the current, and filter for pin 7 of chip U8.

[0029] In this embodiment: Please refer to Figure 1 , the voltage conversion module includes chip U8, the model of chip U8 is LA1823. Pin 3 of chip U8 is connected to the voltage input module. Pin 7 of chip U8 is connected to the startup control module. Pin 6 of chip U8 is grounded through resistor R37. Pin 8 of chip U8 is grounded. Pin 1 of chip U8 is connected to the feedback adjustment module. Pin 4 of chip U8 is connected to one end of capacitor C24. Pin 5 of chip U8 is connected to the other end of capacitor C24, the negative electrode of diode D8, and one end of inductor L11. The positive electrode of diode D8 is grounded. The other end of inductor L11 is connected to the feedback adjustment module, one end of capacitor C20, and one end of capacitor C19. The other end of capacitor C19 is grounded, and the other end of capacitor C20 is grounded.

[0030] Chip U8 is a voltage conversion chip that steps down the input voltage and outputs it. Resistor R37 is a resistor for adjusting the operating frequency, 150kΩ corresponds to 240kHZ. Capacitor C24 is a 100nF bootstrap voltage input and high-side drive power supply. Diode D8 is an output freewheeling diode. Inductor L11 is an output inductor. Capacitors C20 and C19 are output filter capacitors.

[0031] In this embodiment: Please refer to Figure 1 , the feedback adjustment module includes resistors R35 and R38. One end of resistor R35 is connected to the other end of inductor L11. The other end of resistor R35 is connected to one end of resistor R38 and pin 1 of chip U8. The other end of resistor R38 is grounded.

[0032] The resistors R35 and R38 are output feedback voltage-dividing resistors. By adjusting the resistance ratio of these two resistors, the magnitude of the feedback voltage fed back to pin 1 of the chip U8 can be changed, so as to control the magnitude of the output voltage of the chip U8, in order to Figure 1 For the values of each capacitor, resistor, and inductor, the chip U8 finally outputs 12V DC power.

[0033] The working principle of the present utility model is as follows: The voltage input module is used to input 12 - 100V DC power to provide the voltage to be converted for the voltage conversion module; the start control module is used to input a start signal to supply the voltage conversion module to control the operation of the voltage conversion module; the voltage conversion module is used to convert the voltage to be converted into an output voltage for output; the feedback adjustment module is used to detect the output voltage of the voltage conversion module, obtain the sampled voltage, and feedback it to the voltage conversion module to ensure the stability of the output voltage.

[0034] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0035] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wide voltage step-down circuit controlled by multiple signals, characterized in that: The multi-signal controlled wide voltage step-down circuit comprises: The voltage input module is used to input 12-100V DC power and provide the voltage to be converted for the voltage conversion module; A start control module is used to input a start signal to supply the voltage conversion module and control the operation of the voltage conversion module; A voltage conversion module, used for converting the voltage to be converted into an output voltage output; The feedback regulation module is used to detect the output voltage of the voltage conversion module, obtain the sampled voltage, and feed it back to the voltage conversion module to ensure the stability of the output voltage; The voltage input module is connected to the voltage conversion module, the start control module is connected to the voltage conversion module, and the feedback regulation module is connected to the voltage conversion module.

2. The multi-signal controlled wide voltage step-down circuit according to claim 1, characterized in that: The voltage input module includes capacitor C21, capacitor C22, and capacitor C23. One end of capacitor C21 is connected to one end of capacitor C22, one end of capacitor C23, voltage VIN++, and a voltage conversion module. The other end of capacitor C21 is grounded, the other end of capacitor C22 is grounded, and the other end of capacitor C23 is grounded.

3. The multi-signal controlled wide voltage step-down circuit according to claim 1, characterized in that: The startup control module includes a diode D12, a diode D13, a diode D6, a resistor R39, a resistor R65, a resistor R64, and a capacitor C27. The positive electrode of the diode D12 is connected to the startup signal AUTO-STARTUP, the positive electrode of the diode D13 is connected to the startup signal VCC, the positive electrode of the diode D6 is connected to the startup signal POWER_ON / OFF, the negative electrode of the diode D12 is connected to the negative electrode of the diode D13 and one end of the resistor R39, the negative electrode of the diode D6 is connected to one end of the resistor R65, the other end of the resistor R65 is connected to the other end of the resistor R39, one end of the resistor R64, one end of the capacitor C27, and the voltage conversion module, the other end of the resistor R64 is grounded, and the other end of the capacitor C27 is grounded.

4. The multi-signal controlled wide voltage step-down circuit according to claim 1, characterized in that: The voltage conversion module includes chip U8, the model of chip U8 is LA1823, pin 3 of chip U8 is connected to the voltage input module, pin 7 of chip U8 is connected to the start control module, pin 6 of chip U8 is grounded through resistor R37, pin 8 of chip U8 is grounded, pin 1 of chip U8 is connected to the feedback regulation module, pin 4 of chip U8 is connected to one end of capacitor C24, pin 5 of chip U8 is connected to the other end of capacitor C24, the cathode of diode D8, and one end of inductor L11, the anode of diode D8 is grounded, the other end of inductor L11 is connected to the feedback regulation module, one end of capacitor C20, and one end of capacitor C19, the other end of capacitor C19 is grounded, and the other end of capacitor C20 is grounded.

5. The multi-signal controlled wide voltage step-down circuit according to claim 4, characterized in that: The feedback regulation module includes a resistor R35 and a resistor R38. One end of the resistor R35 is connected to the other end of the inductor L11. The other end of the resistor R35 is connected to one end of the resistor R38 and pin 1 of the chip U8. The other end of the resistor R38 is grounded.

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