PWM signal modulation voltage circuit

Abstract

The utility model relates to a PWM signal modulation voltage circuit. The PWM signal modulation voltage circuit comprises a PWM chip, a signal conversion module and a BUCK module, wherein a GPIO (General Purpose Input / Output) port is arranged on the PWM chip; the signal conversion module is electrically connected with the GPIO port; according to the scheme provided by the invention, the step of adjusting the output voltage can be simplified, and the method is more universal.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, in particular to a PWM signal modulation voltage circuit. Background Art

[0002] Currently, in circuit design, a power supply part and a BUCK circuit are independently provided to supply power to the main chip, wherein the BUCK circuit plays a role of voltage reduction.

[0003] In the related art, when the output voltage needs to be adjusted, a lot of time is needed to calculate the voltage divider resistor ratio in the BUCK circuit to achieve the purpose of adjusting the output voltage. However, by calculating the voltage divider resistor ratio, on the one hand, calculation errors are prone to occur, resulting in voltage deviations. On the other hand, when targeting different electronic products, the voltage divider resistor ratio needs to be readjusted. The calculation process is very cumbersome and not universal. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a PWM signal modulation voltage circuit, which can simplify the steps of adjusting the output voltage and is more universal.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a PWM signal modulation voltage circuit, comprising: a PWM chip, wherein the PWM chip is provided with a GPIO port; a signal conversion module, wherein the signal conversion module is electrically connected to the GPIO port; and a BUCK module, wherein the BUCK module is electrically connected to the signal conversion module.

[0007] The signal conversion module includes a resistor R3 and a capacitor C1. A first end of the resistor R3 is connected to the PWM chip, a second end of the resistor R3 is electrically connected to a first end of the capacitor C1, and a second end of the capacitor C1 is grounded.

[0008] The BUCK module includes a chip U2 , and the chip U2 is electrically connected to the first end of the capacitor C1 .

[0009] The BUCK module further includes a resistor R1 and a resistor R2. The resistor R1 is electrically connected to a first end of the resistor R2. The first end of the resistor R2 is also electrically connected to the chip U2. The second end of the resistor R2 is grounded.

[0010] The BUCK module further includes a capacitor C3 and an inductor L1 . A first end of the capacitor C3 is electrically connected to the chip U2 , and a second end of the capacitor C3 is electrically connected to the inductor L1 .

[0011] The BUCK module further includes a capacitor C4, a first end of the capacitor C4 is electrically connected to the chip U2, and a second end of the capacitor C4 is grounded.

[0012] The BUCK module further includes a capacitor C5 , a first end of the capacitor C5 is electrically connected to the chip U2 , and a second end of the capacitor C5 is grounded.

[0013] The BUCK module further includes an output interface, and the output interface is electrically connected to the inductor L1.

[0014] Compared with the prior art, the utility model has at least the following advantages:

[0015] This application uses the GPIO port on the PWM chip to modulate the signal through PWM pulses, and converts the AC signal into a DC signal through a signal conversion module, thereby changing the voltage output by the BUCK module. The above method can replace the traditional method of adjusting the voltage-dividing resistor ratio in the BUCK circuit, eliminating the complicated calculation steps. In addition, since the scale range in the PWM signal parameters is large, and the adjustable voltage range is large, it can adapt to the circuit design of more electronic products and has stronger universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0017] Figure 1 This is a functional module diagram of a PWM signal voltage modulation circuit in an embodiment of the utility model;

[0018] Figure 2 2 is a circuit diagram of a PWM signal voltage modulation circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0020] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0021] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In the related art, when the output voltage needs to be adjusted, a lot of time is needed to calculate the voltage divider resistor ratio in the BUCK circuit to achieve the purpose of adjusting the output voltage. However, by calculating the voltage divider resistor ratio, on the one hand, calculation errors are prone to occur, resulting in voltage deviations. On the other hand, when targeting different electronic products, the voltage divider resistor ratio needs to be readjusted. The calculation process is very cumbersome and not universal.

[0023] In view of the above problems, an embodiment of the present application provides a PWM signal voltage modulation circuit, which can simplify the steps of adjusting the output voltage and is more universal.

[0024] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0025] See also Figure 1 A PWM signal modulation voltage circuit includes: a PWM chip 100, a signal conversion module 200 and a BUCK module 300, wherein the PWM chip 100 is provided with a GPIO port; the signal conversion module 200 is electrically connected to the GPIO port; and the BUCK module 300 is electrically connected to the signal conversion module 200.

[0026] It should be noted that the present application utilizes the GPIO port on the PWM chip 100, through the PWM pulse modulation signal, and converts the AC signal into a DC signal through the signal conversion module 200, thereby changing the voltage output by the BUCK module 300. The above method can replace the traditional method of adjusting the voltage-dividing resistor ratio in the BUCK circuit, eliminating the complicated calculation steps. In addition, since the scale range in the PWM signal parameter is large, and the adjustable voltage range is large, it can adapt to the circuit design of more electronic products and has stronger universality.

[0027] It should also be noted that the PWM signal parameters are: voltage is +5V, CLK pin output is 13KHz, and duty cycle is 50%. Furthermore, the resolution of the entire PWM module is 10bit, so it can be divided into 1024 levels, so one cycle can be divided into 1024 scales, and the voltage corresponding to each scale can be 1 / 1024 of 5V, that is, about 4.88mV. Therefore, the voltage can be within the range of 0-5V, and a step of 4.88mV can be achieved. Therefore, this application has strong universality and can adapt to the circuit design of more electronic products. Among them, the above parameters are only one of the implementation methods, and the specific parameters can be set according to actual conditions.

[0028] See also Figure 2 Specifically, the signal conversion module 200 includes a resistor R3 and a capacitor C1, a first end of the resistor R3 is connected to the PWM chip, a second end of the resistor R3 is electrically connected to a first end of the capacitor C1, and a second end of the capacitor C1 is grounded.

[0029] It should be noted that, since the PWM modulation signal is an AC signal, but in the hardware circuit it is a DC power, a signal conversion module is provided to realize the conversion of the PWM signal into an equivalent DC signal. The principle is that the positive cycle of the PWM signal will charge the capacitor C1, while the negative cycle is the discharge of the capacitor C1. In this way, the capacitor C2 is charged and discharged with the PWM signal, so that the voltage of the capacitor C1 fluctuates around the DC signal equivalent to the PWM signal. However, since the capacitor C1 needs to be charged, and the charging time constant is R*C, the capacitor C1 cannot change with the high-frequency part of the input voltage, so that the high-frequency part will be filtered out, and finally the AC signal is converted into a DC signal.

[0030] See also Figure 2In one embodiment, the BUCK module 300 includes a chip U2, which is electrically connected to the first end of the capacitor C1. Specifically, the BUCK module 300 also includes a resistor R1 and a resistor R2, the resistor R1 is electrically connected to the first end of the resistor R2, the first end of the resistor R2 is also electrically connected to the chip U2, and the second end of the resistor R2 is grounded. Specifically, the BUCK module 300 also includes a capacitor C3 and an inductor L1, the first end of the capacitor C3 is electrically connected to the chip U2, and the second end of the capacitor C3 is electrically connected to the inductor L1. Specifically, the BUCK module 300 also includes a capacitor C4, the first end of the capacitor C4 is electrically connected to the chip U2, and the second end of the capacitor C4 is grounded. Specifically, the BUCK module 300 also includes a capacitor C5, the first end of the capacitor C5 is electrically connected to the chip U2, and the second end of the capacitor C5 is grounded. Specifically, the BUCK module 300 also includes an output interface, which is electrically connected to the inductor L1.

[0031] It should be noted that the resistors R1 and R2 are voltage divider resistors, and the capacitor C3, the inductor L1, the capacitor C4 and the capacitor C5 play a filtering role. The output interface is used to connect other circuit modules.

[0032] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0033] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A PWM signal modulation voltage circuit, characterized in that: include: A PWM chip, wherein the PWM chip is provided with a GPIO port; A signal conversion module, the signal conversion module is electrically connected to the GPIO port; A BUCK module is electrically connected to the signal conversion module.

2. The PWM signal modulation voltage circuit according to claim 1, characterized in that: The signal conversion module includes a resistor R3 and a capacitor C1. A first end of the resistor R3 is connected to the PWM chip, a second end of the resistor R3 is electrically connected to a first end of the capacitor C1, and a second end of the capacitor C1 is grounded.

3. The PWM signal modulation voltage circuit according to claim 2, characterized in that: The BUCK module includes a chip U2 , and the chip U2 is electrically connected to the first end of the capacitor C1 .

4. The PWM signal modulation voltage circuit according to claim 3, characterized in that: The BUCK module further includes a resistor R1 and a resistor R2. The resistor R1 is electrically connected to a first end of the resistor R2. The first end of the resistor R2 is also electrically connected to the chip U2. The second end of the resistor R2 is grounded.

5. The PWM signal modulation voltage circuit according to claim 3, characterized in that: The BUCK module further includes a capacitor C3 and an inductor L1 . A first end of the capacitor C3 is electrically connected to the chip U2 , and a second end of the capacitor C3 is electrically connected to the inductor L1 .

6. The PWM signal modulation voltage circuit according to claim 3, characterized in that: The BUCK module further includes a capacitor C4, a first end of the capacitor C4 is electrically connected to the chip U2, and a second end of the capacitor C4 is grounded.

7. The PWM signal modulation voltage circuit according to claim 3, characterized in that: The BUCK module further includes a capacitor C5 , a first end of the capacitor C5 is electrically connected to the chip U2 , and a second end of the capacitor C5 is grounded.

8. The PWM signal voltage modulation circuit according to claim 5, characterized in that: The BUCK module further includes an output interface, and the output interface is electrically connected to the inductor L1.

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