Voltage power conversion circuit and electronic equipment

Abstract

The utility model discloses a voltage power conversion circuit and electronic equipment, and the circuit comprises a rectification circuit which is used for carrying out the rectification of an input voltage, and obtaining a first voltage; the voltage conversion circuit is electrically connected with the rectifying circuit, and the voltage conversion circuit is used for receiving the first voltage, transforming the first voltage and then outputting a second voltage; and the power conversion circuit is electrically connected with the rectifying circuit and the voltage conversion circuit, and the power conversion circuit is used for receiving the first voltage or the second voltage and inverting the first voltage or the second voltage. Through the mode, power devices are reduced, and the cost is reduced; and miniaturization and high power density design are realized.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a voltage power conversion circuit and electronic device. Background Technology

[0002] With the widespread application of smart fast charging technology in consumer electronic devices such as smartphones and tablets, the continuous updates to the USB Power Delivery (USB PD) standard have driven the continuous improvement of fast charging power. However, when the power exceeds 75W, relevant regulations have become more stringent regarding current harmonics.

[0003] To meet these regulatory requirements, traditional fast charging solutions typically employ a two-stage power conversion architecture: a power factor correction (PFC) power stage and a direct current to direct current converter (DC / DC) isolated power stage. While traditional fast charging solutions meet the requirements for power factor correction and current harmonics to some extent, their complex hardware circuitry and large number of power devices result in high costs and make it difficult to achieve miniaturization and high power density designs. Utility Model Content

[0004] This application mainly provides a voltage-to-power conversion circuit and electronic device to solve the problem that traditional fast charging solutions are difficult to achieve in terms of miniaturization and high power density.

[0005] This application provides a voltage-to-power conversion circuit, including:

[0006] A rectifier circuit is used to rectify the input voltage to obtain a first voltage;

[0007] A voltage conversion circuit is electrically connected to the rectifier circuit. The voltage conversion circuit is used to receive the first voltage, transform the first voltage, and output the second voltage.

[0008] A power conversion circuit is electrically connected to the rectifier circuit and the voltage conversion circuit, respectively. The power conversion circuit is used to receive the first voltage or the second voltage and invert it.

[0009] Specifically, when the input voltage is less than the second voltage, the voltage conversion circuit is turned on, the rectifier bridge of the rectifier circuit is turned off, and the power conversion circuit receives the second voltage.

[0010] When the input voltage is greater than the second voltage, the voltage conversion circuit is turned off, the rectifier bridge of the rectifier circuit is turned on, the first voltage is equal to the input voltage, and the power conversion circuit receives the first voltage.

[0011] The voltage-power conversion circuit further includes a processor, which is used to obtain the maximum value of the second voltage, a first conduction angle corresponding to the maximum value of the second voltage, the minimum value of the second voltage, a second conduction angle corresponding to the minimum value of the second voltage, and to obtain the conduction angle of the rectifier bridge by subtracting the second conduction angle from the first conduction angle.

[0012] When the input voltage is less than the second voltage, the voltage conversion circuit is turned on. The voltage conversion circuit is used to process the first output power, which is the ratio of the conduction angle of the rectifier bridge to pi multiplied by the output power of the rectifier circuit.

[0013] Wherein, the first input terminal of the voltage conversion circuit is electrically connected to the first output terminal of the rectifier circuit, and the first input terminal of the power conversion circuit is electrically connected to both the first output terminal of the rectifier circuit and the first output terminal of the voltage conversion circuit;

[0014] The voltage conversion circuit includes a step-down circuit and a first diode. The first terminal of the step-down circuit is electrically connected to the first output terminal of the rectifier circuit, the second terminal of the step-down circuit is electrically connected to the positive terminal of the first diode, and the negative terminal of the first diode is electrically connected to the first input terminal of the power conversion circuit. The step-down circuit is used to step down the first voltage and output a second voltage.

[0015] Wherein, the first input terminal of the voltage conversion circuit is electrically connected to the first output terminal of the rectifier circuit, and the first input terminal of the power conversion circuit is electrically connected to both the first output terminal of the rectifier circuit and the first output terminal of the voltage conversion circuit;

[0016] The voltage conversion circuit includes a step-down circuit and a first diode. The first terminal of the step-down circuit is electrically connected to the first output terminal of the rectifier circuit, the second terminal of the step-down circuit is electrically connected to the first input terminal of the power conversion circuit, and the third terminal of the step-down circuit is electrically connected to the negative terminal of the first diode. The positive terminal of the first diode is grounded. The step-down circuit is used to step down the first voltage and output a second voltage.

[0017] When the first voltage is less than the second voltage, the first diode is turned on, and the power conversion circuit receives the second voltage from the first diode;

[0018] When the first voltage is greater than the second voltage, the first diode is turned off, and the power conversion circuit receives the first voltage from the rectifier circuit.

[0019] The second input terminal of the voltage conversion circuit is electrically connected to the second output terminal of the rectifier circuit, and the second input terminal of the power conversion circuit is electrically connected to the second output terminal of the voltage conversion circuit.

[0020] The step-down circuit includes a first switching transistor, a second diode, a first inductor, and a first capacitor. The first terminal of the first switching transistor is electrically connected to the controller, the second terminal of the first switching transistor is electrically connected to one end of the first capacitor, the third terminal of the first switching transistor is electrically connected to one end of the first inductor, the other end of the first inductor is electrically connected to the anode of the first diode, the cathode of the second diode is electrically connected between the first switching transistor and the first inductor, the anode of the second diode is grounded, one end of the first capacitor is electrically connected between the first inductor and the first diode, and the other end of the first capacitor is grounded.

[0021] The step-down circuit includes a first switching transistor, a second diode, a first inductor, and a first capacitor. The first terminal of the first switching transistor is electrically connected to the controller, the second terminal of the first switching transistor is electrically connected to the positive terminal of the second diode, the third terminal of the first switching transistor is grounded, the negative terminal of the second diode is electrically connected to one end of the first capacitor, one end of the first capacitor is electrically connected to the first input terminal of the power conversion circuit, the other end of the first capacitor is electrically connected to the negative terminal of the first diode, one end of the first inductor is electrically connected between the first switching transistor and the second diode, and the other end of the first inductor is electrically connected between the first diode and the first capacitor.

[0022] The voltage-to-power conversion circuit further includes a filter circuit. The first output terminal of the filter circuit is electrically connected to the first input terminal of the rectifier circuit, and the second output terminal of the filter circuit is electrically connected to the second input terminal of the rectifier circuit. The filter circuit is used to perform electromagnetic compatibility filtering on the input voltage.

[0023] The rectifier circuit includes a rectifier bridge and a second capacitor. The first end of the rectifier bridge is electrically connected to the first output terminal of the filter circuit, the second end of the rectifier bridge is electrically connected to the second output terminal of the filter circuit, the third end of the rectifier bridge is electrically connected to both the power conversion circuit and the first end of the second capacitor, the fourth end of the rectifier bridge is grounded, and the second end of the second capacitor is grounded. The ground terminal of the other end of the first capacitor is connected to the ground terminal of the power conversion circuit and the ground terminal of the fourth end of the rectifier bridge.

[0024] This application also provides an electronic device, including the voltage-power conversion circuit described above.

[0025] The beneficial effects of this application are as follows: The voltage-to-power conversion circuit of this application includes a rectifier circuit for rectifying the input voltage to obtain a first voltage; a voltage conversion circuit electrically connected to the rectifier circuit for receiving the first voltage, stepping down the first voltage, and outputting a second voltage; and a power conversion circuit electrically connected to both the rectifier circuit and the voltage conversion circuit for receiving either the first voltage or the second voltage and inverting it. By integrating the rectifier circuit, the power conversion circuit, and the voltage conversion circuit, the overall hardware circuit is simplified, power devices are reduced, and costs are lowered. Rectifying the input voltage by the rectifier circuit reduces the harmonic content of the input current, making the input current closer to a sine wave, thereby improving the power factor of the circuit. By placing the voltage conversion circuit between the rectifier circuit and the power conversion circuit, and with the output of the voltage conversion circuit connected in parallel with the output of the rectifier circuit to jointly power the power conversion circuit, the voltage conversion circuit only needs to process a portion of the output power, significantly reducing the size of the voltage conversion circuit and improving efficiency, thus achieving miniaturization and high power density design. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 This is a circuit diagram of one embodiment of the voltage-to-power conversion circuit provided in this application;

[0028] Figure 2 This is a circuit diagram of another embodiment of the voltage-power conversion circuit provided in this application;

[0029] Figure 3 This is a circuit diagram of another embodiment of the voltage-power conversion circuit provided in this application;

[0030] Figure 4 This is a waveform diagram of an embodiment of the input voltage, first voltage, second voltage, and current passing through the rectifier bridge provided in this application. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a connection between two components or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] Traditional fast charging solutions typically employ a two-stage power conversion architecture: a power factor correction (PFC) stage and a direct current to direct current converter (DC / DC) isolated power stage. While traditional fast charging solutions meet the requirements for power factor correction and current harmonics to some extent, their complex hardware circuitry and large number of power devices result in high costs and make it difficult to achieve miniaturization and high power density designs.

[0039] This application provides a voltage-to-power conversion circuit; please refer to [link / reference]. Figure 1 As shown, Figure 1 This is a circuit diagram of one embodiment of the voltage-to-power conversion circuit provided in this application. The voltage-to-power conversion circuit 10 of this embodiment includes a rectifier circuit 12, a power conversion circuit 13, and a voltage conversion circuit 14.

[0040] The rectifier circuit 12 is used to rectify the input voltage U to obtain the first voltage U1.

[0041] The input voltage U can be AC, with a voltage range of 85–265VAC. The rectifier circuit 12 includes, but is not limited to, a rectifier bridge.

[0042] The voltage conversion circuit 14 is electrically connected to the rectifier circuit 12. The voltage conversion circuit 14 is used to receive the first voltage U1, transform the first voltage U1 and output the second voltage U2.

[0043] In some embodiments, the first voltage U1 output by the rectifier circuit 12 is used as the input voltage of the voltage conversion circuit 14. The voltage conversion circuit 14 transforms the voltage based on the first voltage U1 and smoothly outputs the second voltage U2.

[0044] The voltage conversion circuit 14 includes, but is not limited to, a buck converter.

[0045] The power conversion circuit 13 is electrically connected to the rectifier circuit 12 and the voltage conversion circuit 14 respectively. The power conversion circuit 13 is used to receive the first voltage U1 or the second voltage U2 and invert it.

[0046] In some embodiments, both the voltage conversion circuit 14 and the rectifier circuit 12 are electrically connected to the power conversion circuit 13; when the power conversion circuit 13 receives a first voltage U1 from the rectifier circuit 12, the first voltage U1 serves as the input voltage of the power conversion circuit 13, and the power conversion circuit 13 performs inversion based on the first voltage U1; when the power conversion circuit 13 receives a second voltage U2 from the voltage conversion circuit 14, the second voltage U2 serves as the input voltage of the power conversion circuit 13, and the power conversion circuit 13 performs inversion based on the second voltage U2.

[0047] The power conversion circuit 13 includes, but is not limited to, conversion architectures such as flyback topology, forward topology, or resonant topology.

[0048] The voltage-to-power conversion circuit 10 of this embodiment integrates a rectifier circuit 12, a power conversion circuit 13, and a voltage conversion circuit 14, simplifying the overall hardware circuit, reducing power devices, and lowering costs. The rectifier circuit 12 rectifies the input voltage U, reducing the harmonic content of the input current and making the input current closer to a sine wave, thereby improving the circuit's power factor. By placing the voltage conversion circuit 14 between the rectifier circuit 12 and the power conversion circuit 13, and with the output of the voltage conversion circuit 14 connected in parallel with the output of the rectifier circuit 12 to jointly power the power conversion circuit 13, the voltage conversion circuit 14 only needs to process a portion of the output power, reducing its size and improving efficiency, thus achieving miniaturization and high power density design.

[0049] According to some embodiments of this application, such as Figure 2 and Figure 3 As shown, Figure 2 This is a circuit diagram of another embodiment of the voltage conversion circuit provided in this application; Figure 3 This is a circuit diagram of another embodiment of the voltage conversion circuit provided in this application. The voltage power conversion circuit 10 of this embodiment also includes a filter circuit 11.

[0050] The first output terminal 111 of the filter circuit 11 is electrically connected to the first input terminal 121 of the rectifier circuit 12, and the second output terminal 112 of the filter circuit 11 is electrically connected to the second input terminal 122 of the rectifier circuit 12. The filter circuit 11 is used to perform electromagnetic compatibility filtering on the input voltage U, that is, the filter circuit 11 receives the input voltage U, performs electromagnetic compatibility filtering on the input voltage U, and then outputs the result.

[0051] The filter circuit 11 includes, but is not limited to, common-mode inductors, differential-mode inductors, X capacitors, or Y capacitors.

[0052] In some embodiments, the first input terminal 121 and the second input terminal 122 of the rectifier circuit 12 are electrically connected to the first output terminal 111 and the second output terminal 112 of the filter circuit 11, respectively. The rectifier circuit 12 receives the input voltage U after electromagnetic compatibility filtering by the filter circuit 11 and rectifies the input voltage U to obtain the first voltage U1.

[0053] According to some embodiments of this application, such as Figure 2 and Figure 3As shown, the rectifier circuit 12 in this embodiment includes a rectifier bridge 125 and a second capacitor C2. The first end of the rectifier bridge 125 is electrically connected to the first output terminal 111 of the filter circuit 11, the second end of the rectifier bridge 125 is electrically connected to the second output terminal 112 of the filter circuit 11, the third end of the rectifier bridge 125 is electrically connected to the power conversion circuit 13 and the first end of the second capacitor C2, respectively, the fourth end of the rectifier bridge 125 is grounded, and the second end of the second capacitor C2 is grounded.

[0054] In this circuit, the first end of rectifier bridge 125 serves as the first input terminal 121 of rectifier circuit 12, the second end of rectifier bridge 125 serves as the first output terminal 123 of rectifier circuit 12, and the third end of rectifier bridge 125 serves as the second input terminal 122 of rectifier circuit 12. The second capacitor C2 serves as a filter capacitor.

[0055] In some embodiments, after the filter circuit 11 performs electromagnetic compatibility filtering on the input voltage U, the input voltage U is first rectified by the rectifier bridge 125 of the rectifier circuit 12, then filtered by the second capacitor C2, and finally the first voltage U1 is obtained.

[0056] According to some embodiments of this application, please refer to Figure 4 As shown, Figure 4 This is a waveform diagram of an embodiment of the input voltage, first voltage, second voltage, and current passing through the rectifier bridge provided in this application. In this embodiment, when the input voltage U is less than the second voltage U2, the voltage conversion circuit 14 is turned on, the rectifier bridge 125 of the rectifier circuit 12 is turned off, the first voltage U1 is equal to the second voltage U2, and the power conversion circuit 13 receives the second voltage U2.

[0057] like Figure 4 As shown, Figure 4 The horizontal axis represents the phase (angle), and the vertical axis represents the voltage and current values; the input voltage U takes the absolute value, i.e., |U|; the minimum value of the second voltage U2 is U2min, and the maximum value of the second voltage U2 is U2max; the current I passing through the rectifier bridge 125 takes the absolute value, i.e., |I|; the minimum value of the second voltage U2 U2 U2min corresponds to the phase angle θ1, also called the second conduction angle θ1, and the maximum value of the second voltage U2 U2 U2max corresponds to the phase angle θ2, also called the first conduction angle θ2.

[0058] During the phase angles 0 - θ1 and θ2 - π, |U| < U2 and |I| = 0, that is, the input voltage U is less than the second voltage U2, and no current flows through the rectifier bridge 125 of the rectification circuit 12. At this time, the voltage conversion circuit 14 is turned on so that the power conversion circuit 13 receives the second voltage U2, and the second voltage U2 maintains the first voltage U1, making the first voltage U1 equal to the second voltage U2. Therefore, the input voltage U is less than the first voltage U1. Due to the conduction characteristics of the rectifier bridge 125, the rectifier bridge of the rectification circuit 12 is cut off and no current flows through the rectifier bridge 125.

[0059] When the input voltage U is greater than the second voltage U2, the voltage conversion circuit 14 is cut off, the rectifier bridge 125 of the rectification circuit 12 is turned on, the first voltage U1 is equal to the input voltage U, and the power conversion circuit 13 receives the first voltage U1.

[0060] During the phase angle θ1 - θ2, |U| > U2 and |I| ≠ 0, that is, the input voltage U is greater than the second voltage U2, and current flows through the rectifier bridge 125 of the rectification circuit 12. At this time, the voltage conversion circuit 14 is cut off, the rectifier bridge 125 of the rectification circuit 12 is turned on, and the first voltage U1 rectified and output by the rectification circuit 12 follows the input voltage U, that is, the first voltage U1 is equal to the input voltage U, and the power conversion circuit 13 receives the first voltage U1.

[0061] According to some embodiments of the present application, as Figure 1 shown, the first input terminal 141 of the voltage conversion circuit 14 of this embodiment is electrically connected to the first output terminal 123 of the rectification circuit 12, the second input terminal 142 of the voltage conversion circuit 14 is electrically connected to the second output terminal 124 of the rectification circuit 12, the first input terminal 131 of the power conversion circuit 13 is respectively electrically connected to the first output terminal 123 of the rectification circuit 12 and the first output terminal 143 of the voltage conversion circuit 14, and the second input terminal 132 of the power conversion circuit 13 is electrically connected to the second output terminal 144 of the voltage conversion circuit 14.

[0062] Optionally, the first output terminal 123 of the rectification circuit 12 and the first output terminal 143 of the voltage conversion circuit 14 are also called the positive output terminals, and the second output terminal 124 of the rectification circuit 12 and the second output terminal 144 of the voltage conversion circuit 14 are also called the negative output terminals; the first input terminal 141 of the voltage conversion circuit 14 and the first input terminal 131 of the power conversion circuit 13 are also called the positive input terminals, and the second input terminal 142 of the voltage conversion circuit 14 and the second input terminal 132 of the power conversion circuit 13 are also called the negative input terminals.

[0063] In some embodiments, the positive input terminal of the voltage conversion circuit 14 is connected to the positive output terminal of the rectifier circuit 12, the negative input terminal of the voltage conversion circuit 14 is connected to the negative output terminal of the rectifier circuit 12, the positive input terminal of the power conversion circuit 13 is connected to both the positive output terminal of the rectifier circuit 12 and the positive output terminal of the voltage conversion circuit 14, and the negative input terminal of the power conversion circuit 13 is connected to the negative output terminal of the voltage conversion circuit 14, thereby realizing the loop of the voltage-power conversion circuit 10.

[0064] According to some embodiments of this application, such as Figure 2 As shown, the voltage conversion circuit 14 in this embodiment includes a step-down circuit 145 and a first diode D1. The first terminal of the step-down circuit 145 is electrically connected to the first output terminal 123 of the rectifier circuit 12, the second terminal of the step-down circuit 145 is electrically connected to the positive terminal of the first diode D1, and the negative terminal of the first diode D1 is electrically connected to the first input terminal 131 of the power conversion circuit 13. The step-down circuit 145 is used to step down the first voltage U1 and output the second voltage U2.

[0065] In some embodiments, the step-down circuit 145 of the voltage conversion circuit 14 receives the first voltage U1 and steps down the first voltage U1, and smoothly outputs the second voltage U2 through the first diode D1.

[0066] In other embodiments, the diode can be replaced by a switching transistor; the buck circuit 145 is used to boost the first voltage U1 and output the second voltage U2.

[0067] In some embodiments, the voltage-power conversion circuit 10 further includes a processor (not shown), which is used to obtain the maximum value U2max of the second voltage U2, the first conduction angle θ2 corresponding to the maximum value U2max of the second voltage U2, the minimum value U2min of the second voltage U2, and the second conduction angle θ1 corresponding to the minimum value U2min of the second voltage U2, and to obtain the conduction angle θ of the rectifier bridge by subtracting the second conduction angle θ1 from the first conduction angle θ2.

[0068] For example, such as Figure 4 As shown, within half an input AC cycle, i.e., the period from 0 to π, the time period during which current flows through the rectifier bridge 125 of the rectifier circuit 12 corresponds to the conduction angle θ. A small conduction angle θ indicates that current flows through the rectifier bridge 125 for a very short time, resulting in severe input current distortion, high input current harmonics exceeding the requirements for current harmonics, and a large effective current value, thus reducing the efficiency of the rectifier bridge 125. Therefore, increasing the conduction angle θ of the rectifier bridge 125 can improve the power factor and reduce the input current harmonics and effective value.

[0069] During the phase angle θ1-θ2, i.e., when the input voltage U is greater than the second voltage U2, current flows through the rectifier bridge 125 of the rectifier circuit 12. Figure 4 It can be seen that the conduction angle θ of rectifier bridge 125 is equal to the phase angle θ2 minus the phase angle θ1.

[0070] and The formula for calculating the conduction angle θ of rectifier bridge 125 is: Where Umax is the peak voltage of the input voltage U; that is, the conduction angle θ of the rectifier bridge is obtained by subtracting the second conduction angle θ1 from the first conduction angle θ2.

[0071] The peak voltage Umax of the input voltage U can be determined based on the peak value of the minimum input AC voltage. Therefore, by controlling the second voltage U2 output by the voltage conversion circuit 14, the conduction angle θ can be controlled, thereby reducing the input current harmonics and realizing the PFC function.

[0072] Specifically, during the phase angles 0-θ1 and θ2-π, i.e. when the input voltage U is less than the second voltage U2, the voltage conversion circuit 14 is turned on, the step-down circuit 145 receives the first voltage U1, and after stepping down the first voltage U1, it outputs the second voltage U2 through the first diode D1 so that the power conversion circuit 13 receives the second voltage U2; by controlling the maximum value U2max of the second voltage U2 output by the voltage conversion circuit 14, the minimum value U2min of the second voltage U2 can be obtained, i.e., by controlling the maximum value U2max of the second voltage U2 output by the voltage conversion circuit 14, the conduction angle θ can be controlled.

[0073] In some embodiments, during the phase angles 0-θ1 and θ2-π, i.e., when the input voltage U is less than the second voltage U2, the voltage conversion circuit 14 is turned on, and the power conversion circuit 13 receives the second voltage U2 output by the voltage conversion circuit 14. At this time, the voltage conversion circuit 14 processes the first output power P1, which is the ratio of the conduction angle θ of the rectifier bridge 125 to π multiplied by the output power P of the rectifier circuit 12. Therefore, the formula for calculating the first output power P1 that the voltage conversion circuit 14 needs to process is:

[0074] For example, such as Figure 4 As shown, the input voltage U ranges from 90VAC to 264VAC, and Umax is determined based on the peak value of the minimum input AC voltage of 90VAC. Umax is 127V; the minimum value U2min of the second voltage U2 output by the voltage conversion circuit 14 is set to 70V, and the maximum value U2max is set to 90V; the second conduction angle θ1 is calculated to be 33 degrees, the first conduction angle θ2 is 135 degrees, and the conduction angle θ of the rectifier bridge 125 is 102 degrees; at this time, the conduction angle θ is relatively large, which can significantly improve the harmonics of the input current. Furthermore, the voltage conversion circuit 14 needs to process the first output power P1 = 0.567P, and the voltage conversion circuit 14 only needs to process half of the output power P.

[0075] In other embodiments, the maximum value U2max of the second voltage U2 output by the voltage conversion circuit 14 can be set according to actual needs, for example by detecting the input voltage and the output voltage.

[0076] In this embodiment, the conduction angle θ can be controlled by controlling the maximum value U2max of the second voltage U2 output by the voltage conversion circuit 14. The circuit is simple, the control is simple, and the component cost is saved.

[0077] According to some embodiments of this application, such as Figure 3 As shown, the voltage conversion circuit 14 in this embodiment includes a step-down circuit 145 and a first diode D1. The first terminal of the step-down circuit 145 is electrically connected to the first output terminal 123 of the rectifier circuit 12. The second terminal of the step-down circuit 145 is electrically connected to the first input terminal 131 of the power conversion circuit 13. The third terminal of the step-down circuit 145 is electrically connected to the negative terminal of the first diode D1. The positive terminal of the first diode D1 is grounded.

[0078] In some embodiments, the step-down circuit 145 of the voltage conversion circuit 14 receives the first voltage U1 and smoothly outputs the second voltage U2 after stepping down the first voltage U1.

[0079] In other embodiments, the buck circuit 145 is used to boost the first voltage U1 and output the second voltage U2.

[0080] Optionally, the voltage conversion circuit 14 in this embodiment is the same as that in the previous embodiment. Figure 2 The voltage conversion circuit 14 operates on the same principle. During the phase angle θ1-θ2, that is, when the input voltage U is greater than the second voltage U2, current flows through the rectifier bridge 125 of the rectifier circuit 12. Figure 4The formula for calculating the conduction angle θ of the rectifier bridge 125 is obtained. According to this formula, the conduction angle θ can be controlled by controlling the second voltage U2 output by the voltage conversion circuit 14. During the phase angles 0-θ1 and θ2-π, that is, when the input voltage U is less than the second voltage U2, the voltage conversion circuit 14 is turned on, the buck circuit 145 receives the first voltage U1, and outputs the second voltage U2 after stepping down the first voltage U1. The power conversion circuit 13 receives the second voltage U2. By controlling the maximum value U2max of the second voltage U2 output by the voltage conversion circuit 14, the minimum value U2min of the second voltage U2 can be obtained. That is, the conduction angle θ can be controlled by controlling the maximum value U2max of the second voltage U2 output by the voltage conversion circuit 14.

[0081] Optionally, during the phase angles 0-θ1 and θ2-π, i.e. when the input voltage U is less than the second voltage U2, the voltage conversion circuit 14 is turned on, and the power conversion circuit 13 receives the second voltage U2 output by the voltage conversion circuit 14. At this time, the voltage conversion circuit 14 is used to process the first output power P1, which is the ratio of the conduction angle θ of the rectifier bridge 125 to π multiplied by the output power P of the rectifier circuit 12.

[0082] According to some embodiments of this application, see Figure 2 or Figure 3 As shown, in this embodiment, when the first voltage U1 is less than the second voltage U2, the first diode D1 is turned on, and the power conversion circuit 13 receives the second voltage U2 from the first diode D1; when the first voltage U1 is greater than the second voltage U2, the first diode D1 is turned off, and the power conversion circuit 13 receives the first voltage U1 from the rectifier circuit 12.

[0083] The second voltage U2 output by the voltage conversion circuit 14 is connected in parallel with the first voltage U1 output by the rectifier circuit 12 through the first diode D1. The first diode D1 is used to prevent the first voltage U1 from flowing back.

[0084] In some embodiments, when the first voltage U1 is less than the second voltage U2, the first diode D1 is turned on, and the second voltage U2 provides energy to the power conversion circuit 13 through the first diode D1, that is, the power conversion circuit 13 receives the second voltage U2 from the first diode D1; when the first voltage U1 is less than the second voltage U2, the first diode D1 is turned off, and the first voltage U1 provides energy to the power conversion circuit 13, that is, the power conversion circuit 13 receives the first voltage U1 from the rectifier circuit 12.

[0085] The voltage conversion circuit 14 in this embodiment includes a step-down circuit 145 and a first diode D1. By setting the first diode D1, dynamic voltage selection is achieved, the input voltage of the power conversion circuit 13 is optimized, and the efficiency and power factor are improved.

[0086] According to some embodiments of this application, see Figure 2 As shown, the step-down circuit 145 of this embodiment includes a first switch Q1, a second diode D2, a first inductor L1, and a first capacitor C1. The first terminal of the first switch Q1 is electrically connected to a controller (not shown), the second terminal of the first switch Q1 is electrically connected to one end of the first capacitor C1, the third terminal of the first switch Q1 is electrically connected to one end of the first inductor L1, the other end of the first inductor L1 is electrically connected to the anode of the first diode D1, the cathode of the second diode D2 is electrically connected between the first switch Q1 and the first inductor L1, the anode of the second diode D2 is grounded, one end of the first capacitor C1 is electrically connected between the first inductor L1 and the first diode D1, and the other end of the first capacitor C1 is grounded.

[0087] In this circuit, the second terminal of the first switching transistor Q1 serves as one end of the step-down circuit 145 and the first input terminal 141 of the voltage conversion circuit 14; one end of the first capacitor C1 serves as the other end of the step-down circuit 145; and the cathode of the first diode D1 serves as the first output terminal 143 of the voltage conversion circuit 14. The controller is used to control the conduction of the first switching transistor Q1.

[0088] In some embodiments, the step-down circuit 145 receives a first voltage U1, the controller controls the first switch Q1 to turn on, the first inductor L1 to charge, the first capacitor C1 to charge, and the second voltage U2 is less than the first voltage U1; the first inductor L1 and the first capacitor C1 are used for step-down.

[0089] In other embodiments, the first inductor L1 and the first capacitor C1 are used for boosting.

[0090] In some embodiments, the fourth terminal of the rectifier bridge 125 is grounded, and this ground terminal serves as the second output terminal 124 of the rectifier circuit 12; the other end of the first capacitor C1 is grounded, and this ground terminal serves as the second input terminal 142 and the second output terminal 144 of the voltage conversion circuit 14; the ground terminal of the other end of the first capacitor C1 is connected to the ground terminal of the power conversion circuit 13 and the ground terminal of the fourth terminal of the rectifier bridge 125, respectively, so that the voltage-power conversion circuit 10 forms a loop.

[0091] According to some embodiments of this application, see Figure 3As shown, the step-down circuit 145 of this embodiment includes a first switch Q1, a second diode D2, a first inductor L1, and a first capacitor C1. The first terminal of the first switch Q1 is electrically connected to the controller, the second terminal of the first switch Q1 is electrically connected to the positive terminal of the second diode D2, the third terminal of the first switch Q1 is grounded, the negative terminal of the second diode D2 is electrically connected to one end of the first capacitor C1, one end of the first capacitor C1 is electrically connected to the first input terminal 131 of the power conversion circuit 13, and the other end of the first capacitor C1 is electrically connected to the negative terminal of the first diode D1. One end of the first inductor L1 is electrically connected between the first switch Q1 and the second diode D2, and the other end of the first inductor L1 is electrically connected between the first diode D1 and the first capacitor C1.

[0092] In this circuit, the negative terminal of the second diode D2 serves as the first terminal of the step-down circuit 145 and the first input terminal 141 of the voltage conversion circuit 14, one end of the first capacitor C1 serves as the second terminal of the step-down circuit 145 and the first output terminal 143 of the voltage conversion circuit 14, and the other end of the first capacitor C1 serves as the third terminal of the step-down circuit 145.

[0093] In some embodiments, when the input voltage U is less than the second voltage U2, the voltage conversion circuit 14 stops working, and the energy of the first capacitor C1 is used to provide energy to the power conversion circuit 13 through the first diode D1; when the input voltage U is greater than the second voltage U2, the voltage conversion circuit 14 starts working, and the first capacitor C1 is charged.

[0094] In some embodiments, the positive terminal of the first diode D1 is grounded, and this ground terminal serves as the second input terminal 142 and the second output terminal 144 of the voltage conversion circuit 14. The ground terminal of the positive terminal of the first diode D1 is connected to the ground terminal of the power conversion circuit 13 and the ground terminal of the fourth terminal of the rectifier bridge 125, respectively, so that the voltage power conversion circuit 10 forms a loop.

[0095] Another embodiment of this application provides an electronic device including the voltage power conversion circuit 10 of the above embodiment.

[0096] In summary, the voltage-to-power conversion circuit 10 of this application integrates a rectifier circuit 12, a power conversion circuit 13, and a voltage conversion circuit 14, simplifying the overall hardware circuit, reducing power devices, and lowering costs. The rectifier circuit 12 rectifies the input voltage U, reducing the harmonic content of the input current and making the input current closer to a sine wave, thereby improving the circuit's power factor. By placing the voltage conversion circuit 14 between the rectifier circuit 12 and the power conversion circuit 13, and having the output of the voltage conversion circuit 14 connected in parallel with the output of the rectifier circuit 12 to jointly power the power conversion circuit 13, the voltage conversion circuit 14 only needs to process a portion of the output power, significantly reducing its size and improving efficiency, thus achieving miniaturization and high power density design.

[0097] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A voltage-to-power conversion circuit, characterized in that, include: A rectifier circuit is used to rectify the input voltage to obtain a first voltage; A voltage conversion circuit is electrically connected to the rectifier circuit. The voltage conversion circuit is used to receive the first voltage, transform the first voltage, and output the second voltage. A power conversion circuit is electrically connected to the rectifier circuit and the voltage conversion circuit, respectively. The power conversion circuit is used to receive the first voltage or the second voltage and invert it.

2. The voltage-to-power conversion circuit according to claim 1, characterized in that, When the input voltage is less than the second voltage, the voltage conversion circuit is turned on, the rectifier bridge of the rectifier circuit is turned off, and the power conversion circuit receives the second voltage. When the input voltage is greater than the second voltage, the voltage conversion circuit is turned off, the rectifier bridge of the rectifier circuit is turned on, the first voltage is equal to the input voltage, and the power conversion circuit receives the first voltage.

3. The voltage-to-power conversion circuit according to claim 2, characterized in that, The voltage-to-power conversion circuit further includes a processor, which is used to obtain the maximum value of the second voltage, a first conduction angle corresponding to the maximum value of the second voltage, the minimum value of the second voltage, a second conduction angle corresponding to the minimum value of the second voltage, and subtract the second conduction angle from the first conduction angle to obtain the conduction angle of the rectifier bridge.

4. The voltage-to-power conversion circuit according to claim 3, characterized in that, When the input voltage is less than the second voltage, the voltage conversion circuit is turned on. The voltage conversion circuit is used to process the first output power, which is the ratio of the conduction angle of the rectifier bridge to pi multiplied by the output power of the rectifier circuit.

5. The voltage-to-power conversion circuit according to claim 1, characterized in that, The first input terminal of the voltage conversion circuit is electrically connected to the first output terminal of the rectifier circuit, and the first input terminal of the power conversion circuit is electrically connected to both the first output terminal of the rectifier circuit and the first output terminal of the voltage conversion circuit. The voltage conversion circuit includes a step-down circuit and a first diode. The first terminal of the step-down circuit is electrically connected to the first output terminal of the rectifier circuit, the second terminal of the step-down circuit is electrically connected to the positive terminal of the first diode, and the negative terminal of the first diode is electrically connected to the first input terminal of the power conversion circuit. The step-down circuit is used to step down the first voltage and output a second voltage.

6. The voltage-to-power conversion circuit according to claim 1, characterized in that, The first input terminal of the voltage conversion circuit is electrically connected to the first output terminal of the rectifier circuit, and the first input terminal of the power conversion circuit is electrically connected to both the first output terminal of the rectifier circuit and the first output terminal of the voltage conversion circuit. The voltage conversion circuit includes a step-down circuit and a first diode. The first terminal of the step-down circuit is electrically connected to the first output terminal of the rectifier circuit, the second terminal of the step-down circuit is electrically connected to the first input terminal of the power conversion circuit, and the third terminal of the step-down circuit is electrically connected to the negative terminal of the first diode. The positive terminal of the first diode is grounded. The step-down circuit is used to step down the first voltage and output a second voltage.

7. The voltage-to-power conversion circuit according to claim 5 or 6, characterized in that, When the first voltage is less than the second voltage, the first diode is turned on, and the power conversion circuit receives the second voltage from the first diode; When the first voltage is greater than the second voltage, the first diode is turned off, and the power conversion circuit receives the first voltage from the rectifier circuit.

8. The voltage-to-power conversion circuit according to claim 5 or 6, characterized in that, The second input terminal of the voltage conversion circuit is electrically connected to the second output terminal of the rectifier circuit, and the second input terminal of the power conversion circuit is electrically connected to the second output terminal of the voltage conversion circuit.

9. The voltage-to-power conversion circuit according to claim 5, characterized in that, The step-down circuit includes a first switching transistor, a second diode, a first inductor, and a first capacitor. The first terminal of the first switching transistor is electrically connected to the controller, the second terminal of the first switching transistor is electrically connected to one end of the first capacitor, the third terminal of the first switching transistor is electrically connected to one end of the first inductor, the other end of the first inductor is electrically connected to the anode of the first diode, the cathode of the second diode is electrically connected between the first switching transistor and the first inductor, the anode of the second diode is grounded, one end of the first capacitor is electrically connected between the first inductor and the first diode, and the other end of the first capacitor is grounded.

10. The voltage-to-power conversion circuit according to claim 6, characterized in that, The step-down circuit includes a first switching transistor, a second diode, a first inductor, and a first capacitor. The first terminal of the first switching transistor is electrically connected to the controller, the second terminal of the first switching transistor is electrically connected to the positive terminal of the second diode, the third terminal of the first switching transistor is grounded, the negative terminal of the second diode is electrically connected to one end of the first capacitor, one end of the first capacitor is electrically connected to the first input terminal of the power conversion circuit, the other end of the first capacitor is electrically connected to the negative terminal of the first diode, one end of the first inductor is electrically connected between the first switching transistor and the second diode, and the other end of the first inductor is electrically connected between the first diode and the first capacitor.

11. The voltage-to-power conversion circuit according to claim 10, characterized in that, The voltage-to-power conversion circuit further includes a filter circuit. The first output terminal of the filter circuit is electrically connected to the first input terminal of the rectifier circuit, and the second output terminal of the filter circuit is electrically connected to the second input terminal of the rectifier circuit. The filter circuit is used to perform electromagnetic compatibility filtering on the input voltage.

12. The voltage-to-power conversion circuit according to claim 11, characterized in that, The rectifier circuit includes a rectifier bridge and a second capacitor. The first end of the rectifier bridge is electrically connected to the first output terminal of the filter circuit, the second end of the rectifier bridge is electrically connected to the second output terminal of the filter circuit, the third end of the rectifier bridge is electrically connected to the power conversion circuit and the first end of the second capacitor, the fourth end of the rectifier bridge is grounded, and the second end of the second capacitor is grounded. The ground terminal of the other end of the first capacitor is connected to the ground terminal of the power conversion circuit and the ground terminal of the fourth end of the rectifier bridge.

13. An electronic device, characterized in that, Includes the voltage-to-power conversion circuit as described in any one of claims 1-12.

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