DC-DC output adjustable power supply

Abstract

The utility model relates to the technical field of vehicle-mounted core board low-voltage power supplies, in particular to a DC-DC direct-current output adjustable power supply, which comprises a control chip, a high-level input circuit, a voltage input circuit, a power supply input circuit and a voltage adjusting circuit, the control chip is provided with an RUN pin, a GND pin, an SW pin, a VIN pin and a VFB / VOT pin, the RUN pin is connected with the high-level input circuit, the GND pin is connected with the SW pin, and the VFB / VOT pin is connected with the voltage input circuit. The GND pin is grounded, the SW pin is connected with the voltage input circuit, the VIN pin is connected with the power supply input circuit, the VFB / VOT pin is connected with the voltage regulation circuit, the VFB / VOT pin is externally connected with the I / O port of the MCU for voltage change regulation, when the base voltage of the triode Q23 is greater than 0.7 V, the triode Q23 is conducted, the collector is 0V voltage, the resistor R128 is connected in series to the ground, the divider resistor is equivalent to the parallel connection of the R128 and the R646, and the resistor R646 is connected with the voltage regulation circuit. By adjusting the resistance value of the R128 resistor, the size of the DC-DC output voltage can be changed, and the effects of changing the output load, saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage power supply technology for vehicle core boards, and in particular to a DC-DC adjustable power supply. Background Technology

[0002] A DC-DC converter is a common power conversion device that can convert between different DC power values. It has advantages such as high efficiency, large output current, and low quiescent current. With the improvement of integration, the number of external components required for DC-DC converters has been greatly reduced, and their performance in terms of power consumption and efficiency is also better.

[0003] However, existing DC-DC converters often suffer from problems such as non-adjustable output voltage, high failure rate, large quiescent current, and high power consumption when used in automotive applications. In particular, they cannot automatically adjust the output voltage when the load changes, resulting in energy waste. Utility Model Content

[0004] The purpose of this invention is to provide a DC-DC adjustable power supply to solve the problems that existing DC-DC converters often have when used in automotive applications, such as non-adjustable output voltage, high failure rate, large static current, and high power consumption. In particular, they cannot automatically adjust the output voltage when the load changes, resulting in energy waste.

[0005] To achieve the above objectives, this utility model provides a DC-DC adjustable power supply. The DC-DC adjustable power supply includes a control chip, a high-level input circuit, a voltage input circuit, a power input circuit, and a voltage adjustment circuit. The control chip is provided with a RUN pin, a GND pin, a SW pin, a VIN pin, and a VFB / VOT pin. The RUN pin is connected to the high-level input circuit, the GND pin is grounded, the SW pin is connected to the voltage input circuit, the VIN pin is connected to the power input circuit, and the VFB / VOT pin is connected to the voltage adjustment circuit.

[0006] The voltage adjustment circuit includes a transistor Q23, a resistor R128, and a resistor R646. Pin 1 of the transistor Q23 is grounded, and pin 2 of the transistor Q23 is connected to the DVFS1 terminal through a resistor R132. A resistor R130 and a resistor R128 are connected in series between pin 2 of the transistor Q23 and the VFB / VOT pin. A resistor R646 is connected between the VFB / VOT pin and pin 1 of the transistor Q23.

[0007] The high-level input circuit includes a resistor R258. The RUN pin is connected to the MCU_DVR_PWR_EN terminal through the resistor R258. The ground line of the GND pin is connected in parallel with the high-level input circuit, and a resistor R648 and a capacitor C575 are connected in parallel.

[0008] The voltage input circuit includes an inductor L107, a capacitor C578, and a capacitor C574. The SW pin is connected to the VDD terminal through the inductor L107. The end of the inductor L107 near the VDD terminal has a grounding loop in which the capacitors C578 and C574 are connected in parallel.

[0009] The power input circuit includes an inductor L106, a capacitor C576, a capacitor C577, and a capacitor C573. The VIN pin is connected to the DVR terminal through the inductor L106. A grounding loop is provided at the inductor L106, in which the capacitors C576, C577, and C573 are connected in parallel.

[0010] A resistor R129 is provided between the voltage input circuit and the voltage adjustment circuit.

[0011] A resistor R651 is provided between the power input circuit and the high-level input circuit.

[0012] This utility model discloses an adjustable DC-DC output power supply, comprising a control chip, a high-level input circuit, a voltage input circuit, a power input circuit, and a voltage adjustment circuit. The control chip is equipped with a RUN pin, a GND pin, a SW pin, a VIN pin, and a VFB / VOT pin. The RUN pin is connected to the high-level input circuit, the GND pin is grounded, the SW pin is connected to the voltage input circuit, the VIN pin is connected to the power input circuit, and the VFB / VOT pin is connected to the voltage adjustment circuit. The voltage is adjusted by changing the voltage of the MCU's I / O port connected to the VFB / VOT pin. When the base voltage of transistor Q23 is greater than 0.7V, transistor Q23 conducts, and the collector voltage is 0V. The series resistor R128 is connected to ground. At this time, the voltage divider resistor is equivalent to R128 and R646 connected in parallel. By adjusting the resistance value of R128, the DC-DC output voltage can be changed, thereby changing the output load and achieving energy saving and consumption reduction. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is the circuit diagram of the adjustable DC-DC output power supply provided by this utility model. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0016] Please see Figure 1 This utility model provides a DC-DC adjustable power supply, which includes a control chip, a high-level input circuit, a voltage input circuit, a power input circuit, and a voltage adjustment circuit. The control chip is provided with a RUN pin, a GND pin, a SW pin, a VIN pin, and a VFB / VOT pin. The RUN pin is connected to the high-level input circuit, the GND pin is grounded, the SW pin is connected to the voltage input circuit, the VIN pin is connected to the power input circuit, and the VFB / VOT pin is connected to the voltage adjustment circuit.

[0017] The voltage adjustment circuit includes a transistor Q23, a resistor R128, and a resistor R646. Pin 1 of the transistor Q23 is grounded, and pin 2 of the transistor Q23 is connected to the DVFS1 terminal through a resistor R132. A resistor R130 and a resistor R128 are connected in series between pin 2 of the transistor Q23 and the VFB / VOT pin. A resistor R646 is connected between the VFB / VOT pin and pin 1 of the transistor Q23.

[0018] In this embodiment, the voltage of the MCU's I / O port is adjusted by changing the voltage of the VFB / VOT pin. When the base voltage of the transistor Q23 is greater than 0.7V, the transistor Q23 is turned on, and the collector voltage is 0V. The resistor R128 is connected in series to ground. At this time, the voltage divider resistor is equivalent to R128 and R646 in parallel. By adjusting the resistance value of R128, the magnitude of the DC-DC output voltage can be changed, thereby changing the output load and achieving energy saving and consumption reduction.

[0019] The high-level input circuit includes a resistor R258. The RUN pin is connected to the MCU_DVR_PWR_EN terminal through the resistor R258. The ground line of the GND pin is connected in parallel with the high-level input circuit, and a resistor R648 and a capacitor C575 are connected in parallel.

[0020] The voltage input circuit includes an inductor L107, a capacitor C578, and a capacitor C574. The SW pin is connected to the VDD terminal through the inductor L107. The end of the inductor L107 near the VDD terminal has a grounding loop in which the capacitors C578 and C574 are connected in parallel.

[0021] The power input circuit includes an inductor L106, a capacitor C576, a capacitor C577, and a capacitor C573. The VIN pin is connected to the DVR terminal through the inductor L106. A grounding loop is provided at the inductor L106, in which the capacitors C576, C577, and C573 are connected in parallel.

[0022] A resistor R129 is provided between the voltage input circuit and the voltage adjustment circuit.

[0023] A resistor R651 is provided between the power input circuit and the high-level input circuit.

[0024] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A DC-DC adjustable power supply, characterized in that, It includes a control chip, a high-level input circuit, a voltage input circuit, a power input circuit, and a voltage adjustment circuit. The control chip is provided with a RUN pin, a GND pin, a SW pin, a VIN pin, and a VFB / VOT pin. The RUN pin is connected to the high-level input circuit, the GND pin is grounded, the SW pin is connected to the voltage input circuit, the VIN pin is connected to the power input circuit, and the VFB / VOT pin is connected to the voltage adjustment circuit. The voltage adjustment circuit includes a transistor Q23, a resistor R128, and a resistor R646. Pin 1 of the transistor Q23 is grounded, and pin 2 of the transistor Q23 is connected to the DVFS1 terminal through a resistor R132. A resistor R130 and a resistor R128 are connected in series between pin 2 of the transistor Q23 and the VFB / VOT pin. A resistor R646 is connected between the VFB / VOT pin and pin 1 of the transistor Q23.

2. The DC-DC adjustable power supply as described in claim 1, characterized in that, The high-level input circuit includes a resistor R258. The RUN pin is connected to the MCU_DVR_PWR_EN terminal through the resistor R258. A resistor R648 and a capacitor C575 are connected in parallel between the ground line of the GND pin and the high-level input circuit.

3. The DC-DC adjustable power supply as described in claim 2, characterized in that, The voltage input circuit includes an inductor L107, a capacitor C578, and a capacitor C574. The SW pin is connected to the VDD terminal through the inductor L107. The end of the inductor L107 near the VDD terminal has a grounding loop in which the capacitors C578 and C574 are connected in parallel.

4. The DC-DC adjustable power supply as described in claim 3, characterized in that, The power input circuit includes an inductor L106, a capacitor C576, a capacitor C577, and a capacitor C573. The VIN pin is connected to the DVR terminal through the inductor L106. A grounding loop is provided at the inductor L106, in which the capacitors C576, C577, and C573 are connected in parallel.

5. The DC-DC adjustable power supply as described in claim 4, characterized in that, A resistor R129 is provided between the voltage input circuit and the voltage adjustment circuit.

6. The DC-DC adjustable power supply as described in claim 5, characterized in that, A resistor R651 is provided between the power input circuit and the high-level input circuit.

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