A voltage step output DC to DC power supply circuit and electronic communication products

Abstract

The utility model relates to a kind of voltage step output DC to DC power supply circuit and electronic communication product, including DC to DC chip, the IN pin of DC to DC chip is connected power input end, the SW pin of DC to DC chip is connected power inductance, and the other end of power inductance is connected power output end and voltage division module;Voltage division module connects the FB pin of DC to DC chip and the S pole of NMOS tube, the D pole of NMOS tube is grounded, and the G pole of NMOS tube is connected with pull-up resistor and the IO port of external CPU;The switching characteristic of the cheap N-MOS tube in the application solves the conversion function of product CPU core voltage under different working conditions, ensures the stability of product, effectively controls the temperature of product, also reduces the material cost of product itself, and provides strong market competitiveness for enterprise.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology for electronic communication products, and more specifically, to a voltage step output DC to DC power supply circuit and an electronic communication product. Background Technology

[0002] In today's era of rapid technological development, the upgrading and replacement of electronic communication products and price competition are becoming increasingly fierce. Especially with the rise of smart home IoT and AI, various electrical appliances and terminal devices are realizing the Internet of Things, and wireless communication has become an indispensable part. Wireless Wi-Fi network devices are being upgraded rapidly, and major manufacturers are constantly launching Wi-Fi 7 devices based on IEEE 802.11be.

[0003] Wi-Fi 7 devices benefit from wider bandwidth, higher-order modulation (4K-QAM), and multi-link operation technology, resulting in higher wireless transmission rates. However, due to the high transmission rate of Wi-Fi 7, the requirements for the chip's core voltage are also higher. To meet user experience needs, the chip's core voltage needs to be appropriately increased when processing data or improving wireless speed, thereby enhancing the transmission rate. When the number of connected users is low or the transmission volume decreases, the CPU will need to appropriately reduce the core voltage to reduce CPU heat generation and ensure stable product operation.

[0004] In existing technologies, DC to DC power converters generally use a fixed voltage output type (such as...). Figure 1 As mentioned above, when a voltage sufficient for the chip's operation is input to the power chip's input terminal, the chip's feedback pin (FB) controls the SW pin to output a fixed voltage through a resistor divider. This output voltage provides a stable power supply for subsequent circuits. However, this type of circuit cannot adjust the output power level during normal operation. Therefore, some products use power chips with MCU and software editing capabilities, but these chips are expensive and difficult to implement. Additionally, some engineers use dual DC-to-DC power supply circuits (such as...). Figure 2(As mentioned above); The CPU I / O port of WiFi7 outputs high and low levels to the gate of the Q2 MOSFET. The conduction and cutoff of the MOSFET control the on and off of the two DC-to-DC converters, thereby achieving CPU core level switching. However, this circuit has drawbacks. Firstly, there is a delay of a few milliseconds during voltage switching. Secondly, the use of two DC-to-DC converters significantly increases costs and occupies PCB space, a common concern for engineers. Increased space requirements also lead to larger components, further increasing costs and ultimately hindering the manufacturer's price competitiveness. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a voltage step output DC to DC power supply circuit, and to provide an electronic communication product having the voltage step output DC to DC power supply circuit, in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A voltage step output DC-DC power supply circuit is constructed, comprising a DC-DC chip, wherein the IN pin of the DC-DC chip is connected to the power input terminal, the SW pin of the DC-DC chip is connected to a power inductor, the other end of the power inductor is connected to the power output terminal and a voltage divider module; the voltage divider module is connected to the FB pin of the DC-DC chip and the S terminal of an NMOS transistor, the D terminal of the NMOS transistor is grounded, and the G terminal of the NMOS transistor is connected to a pull-up resistor and an I / O port of an external CPU.

[0007] The voltage step output DC to DC power supply circuit of the present invention includes a voltage divider module comprising a first resistor, a second resistor, and a third resistor. One end of the first resistor is connected to the other end of the power inductor, and the other end of the first resistor is connected to the FB pin of the DC to DC chip and the second resistor; The other end of the second resistor is connected to the third resistor and the source (S) terminal of the NMOS transistor, and the other end of the third resistor is grounded.

[0008] The voltage step output DC to DC power supply circuit of the present invention includes a fourth resistor and a first capacitor connected to the IN pin of the DC to DC chip; the other end of the fourth resistor is connected to the EN pin of the DC to DC chip, and the other end of the first capacitor is grounded.

[0009] The voltage step output DC to DC power supply circuit of the present invention includes a power inductor whose other end is connected to a second capacitor, and the other end of the second capacitor is grounded.

[0010] An electronic communication product, wherein the electronic communication product is provided with a voltage step output DC to DC power supply circuit as described above.

[0011] The beneficial effects of this utility model are as follows: This application solves the problem of changing the CPU core voltage of the product under different working conditions by using the switching characteristics of the inexpensive N-MOS transistor, ensuring the stability of the product, effectively controlling the temperature of the product, reducing the material cost of the product itself, and providing the enterprise with strong market competitiveness. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. 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. Figure 1 This is a circuit diagram of an existing fixed voltage output type DC to DC power supply circuit; Figure 2 This is the circuit diagram of an existing two-way DC to DC power supply circuit; Figure 3 This is a circuit diagram of a voltage step output DC to DC power supply circuit according to a preferred embodiment of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] The preferred embodiment of this utility model is a voltage step output DC to DC power supply circuit, such as... Figure 3As shown, it includes a DC to DC chip U1. The IN pin of the DC to DC chip U1 is connected to the power input terminal. The SW pin of the DC to DC chip U1 is connected to the power inductor L1. The other end of the power inductor L1 is connected to the power output terminal and the voltage divider module. The voltage divider module is connected to the FB pin of the DC to DC chip U1 and the S terminal of the NMOS transistor Q1. The D terminal of the NMOS transistor Q1 is grounded. The G terminal of the NMOS transistor Q1 is connected to the pull-up resistor R5 and the I / O port of the external CPU. Preferably, the voltage divider module may include a first resistor R2, a second resistor R3, and a third resistor R4; One end of the first resistor R2 is connected to the other end of the power inductor L1, and the other end of the first resistor R2 is connected to the FB pin of the DC to DC chip U1 and the second resistor R3. The other end of the second resistor R3 is connected to the third resistor R4 and the source of the NMOS transistor Q1, and the other end of the third resistor R4 is grounded. It should be noted that the voltage divider module can also change the number of resistors and the series-parallel relationship according to the needs of voltage division. The scheme obtained by this conventional method is also within the scope of protection of this application.

[0015] Preferably, the IN pin of the DC to DC chip U1 is connected to a fourth resistor R1 and a first capacitor C1; the other end of the fourth resistor R1 is connected to the EN pin of the DC to DC chip U1, and the other end of the first capacitor C1 is grounded; the other end of the power inductor L1 is connected to a second capacitor C2, and the other end of the second capacitor C2 is grounded.

[0016] To avoid using expensive power supply chips with integrated MCUs and software editing, and to avoid using multi-channel DC-DC power conversion circuits, thereby reducing product costs and enhancing competitiveness in a fiercely competitive market, my invention uses an N-MOS transistor added to the FB circuit to achieve output voltage conversion to meet the CPU core voltage. The circuit diagram, principle, and examples are explained below: When the CPU needs to work under high load or transmit at high speed, and when the CPU switches to low load and low transmission speed, in order to reduce temperature and improve user experience, the CPU's dedicated I / O port will control the external power supply circuit to output high or low voltage (within the CPU core level range) by outputting high or low level. When a voltage sufficient for the normal operation of the U1 chip is input to the power input pin (IN), the SW pin outputs the power required by the product after passing through the L1 power inductor and through feedback from R2, R3, R4 and FB.

[0017] Assume the CPU core voltage is 0.85V (range: 0.83~0.93V); the DC to DC power chip FB reference voltage is 0.6V; R2 is 10KΩ, R3 is 18.7KΩ, R4 is 4.7KΩ, and R5 is a 10KΩ pull-up resistor with a pull-up voltage of 1.8V.

[0018] When the product is in standby, low-load operation, or low-speed transmission, the CPU's dedicated I / O port outputs a low level by default. At this time, Q1 is in the off state, and the output voltage is equal to 0.6×{1+R2÷(R3+R4)}≈0.856V.

[0019] When the product is operating under high load or high speed transmission, the CPU's dedicated IO port will output a high level. At this time, the gate of Q1 receives a high level, and the Q1 MOS transistor is in the conducting state. The resistance between the drain and source of the MOS is very small and can be regarded as a short circuit. Then the output voltage is equal to 0.6×(1+R2÷R3)≈0.921V.

[0020] This design utilizes the low-cost switching characteristics of N-MOS transistors to solve the problem of changing the CPU core voltage under different operating conditions, ensuring product stability, effectively controlling product temperature, reducing the product's material costs, and providing the company with strong market competitiveness.

[0021] An electronic communication product, wherein the electronic communication product is provided with a voltage step output DC to DC power supply circuit as described above.

[0022] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A DC to DC power supply circuit with voltage step output, characterized in that, The device includes a DC-to-DC chip, with its IN pin connected to the power input terminal and its SW pin connected to a power inductor. The other end of the power inductor is connected to the power output terminal and a voltage divider module. The voltage divider module is connected to the FB pin of the DC-to-DC chip and the S terminal of an NMOS transistor. The D terminal of the NMOS transistor is grounded, and the G terminal of the NMOS transistor is connected to a pull-up resistor and an external CPU I / O port.

2. The voltage step output DC to DC power supply circuit according to claim 1, characterized in that, The voltage divider module includes a first resistor, a second resistor, and a third resistor; One end of the first resistor is connected to the other end of the power inductor, and the other end of the first resistor is connected to the FB pin of the DCto DC chip and the second resistor; The other end of the second resistor is connected to the third resistor and the source (S) terminal of the NMOS transistor, and the other end of the third resistor is grounded.

3. The voltage step output DC to DC power supply circuit according to claim 1, characterized in that, The IN pin of the DC to DC chip is connected to a fourth resistor and a first capacitor; the other end of the fourth resistor is connected to the EN pin of the DC to DC chip, and the other end of the first capacitor is grounded.

4. The voltage step output DC to DC power supply circuit according to claim 1, characterized in that, The other end of the power inductor is connected to a second capacitor, and the other end of the second capacitor is grounded.

5. An electronic communication product, characterized in that, The electronic communication product is equipped with a voltage step output DC to DC power supply circuit as described in any one of claims 1-4.

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