Circuit for adjusting AC-DC output voltage based on DC-DC output voltage and PD power supply

Abstract

The utility model discloses a circuit for adjusting AC-DC output voltage based on DC-DC output voltage and a PD power supply. The circuit comprises an AC-DC conversion circuit, at least one DC-DC conversion circuit, an output module, a protocol circuit and a following voltage regulation module, the protocol circuit generates a voltage regulation signal according to the output of the output module, and each DC-DC conversion circuit regulates the output voltage according to the voltage regulation signal. The following voltage regulation module generates a following voltage regulation signal according to the maximum value of the regulated DC-DC output voltage, and the AC-DC conversion circuit regulates the AC-DC output voltage according to the following voltage regulation signal. Therefore, the DC / DC input voltage and the DC / DC output voltage maintain a small difference value, and the DC / DC conversion efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply circuits, and in particular to a circuit for adjusting an AC-DC output voltage based on a DC-DC output voltage and a PD power supply. Background Art

[0002] Traditional power supplies have long offered fixed output voltages. However, the proliferation of new technologies like 5G and the Internet of Things has spurred the emergence of new adjustable power supplies, such as PD power supplies and power electronics devices with automatic adjustment or protocol-based adjustment. PD power supplies offer advantages over traditional USB power supplies with self-regulation, including diverse output configurations (e.g., customization and combination options); wide dynamic range output voltage (e.g., continuously adjustable output voltage from 3.3V to 48V); and output currents up to 5A.

[0003] Since PD power supplies typically use an AC / DC+DC / DC topology, the DC / DC converter inevitably generates a certain amount of heat and energy efficiency loss during the power conversion process, especially at high power levels. To improve overall efficiency and reduce power loss, DC / DC converters can use a pass-through mode or other optimization methods in high-power applications to minimize unnecessary energy efficiency losses. However, conventional protocols do not support DC / DC pass-through. Individual customized chips may be able to achieve this, but these are bound to the DC / DC and the protocol, which is costly, difficult to supply, and inflexible in solution selection. The smaller the difference between the DC / DC input and output voltages, the higher the efficiency. Therefore, in the absence of pass-through, synchronously adjusting the AC / DC voltage to maintain a small difference with the DC / DC output voltage can greatly improve efficiency.

[0004] Based on this, a new solution is needed. Utility Model Content

[0005] The main purpose of the utility model is to provide a circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage, so that the DC-DC output voltage follows the AC-DC output voltage, so that the difference between the DC-DC input and output voltages is maintained at a relatively small level, thereby improving the DC-DC conversion efficiency.

[0006] To achieve the above-mentioned objectives, the present invention provides a circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage, comprising an AC-DC conversion circuit, at least one DC-DC conversion circuit, an output module, a protocol circuit and a following voltage regulation module, wherein the output end of the AC-DC conversion circuit is connected to the input end of each of the DC-DC conversion circuits, the output end of each of the DC-DC conversion circuits is connected to the input end of the output module and the input end of the following voltage regulation module, the output end of the following voltage regulation module is connected to the feedback end of the AC-DC conversion circuit, the output end of the output module is connected to the input end of the protocol circuit, and the protocol circuit is also connected to the feedback end of each of the DC-DC conversion circuits, the protocol circuit generates a voltage regulation signal according to the output of the output module, each of the DC-DC conversion circuits adjusts the output voltage according to the voltage regulation signal, the following voltage regulation module generates a following voltage regulation signal according to the maximum value of the adjusted DC-DC output voltage, and the AC-DC conversion circuit adjusts the AC-DC output voltage according to the following voltage regulation signal.

[0007] In the circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage provided by the present invention, the DC-DC conversion circuit includes a DC-DC chip and a diode D1, the positive electrode of the diode D1 is connected to the output end of the DC-DC chip, and the negative electrode of the diode D1 is connected to the follower voltage regulation module.

[0008] In the circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage provided by the present invention, the AC-DC conversion circuit includes an AC-DC chip, a first resistor R1 and a second resistor R2, the first end of the first resistor R1 is connected to the output end of the AC-DC chip, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the feedback end of the AC-DC chip, and the second end of the second resistor R2 is grounded.

[0009] In the circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage provided by the present invention, the follower voltage regulation module includes a field effect transistor Q1, a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The collector of the field effect transistor Q1 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the feedback end of the AC-DC chip. The emitter of the field effect transistor Q1 is connected to the first end of the first capacitor C1, the first end of the fourth resistor R4 and the output end of the AC-DC chip. The base of the field effect transistor Q1 is connected to the second end of the first capacitor C1, the second end of the fourth resistor R4 and the first end of the resistor R5. The second end of the resistor R5 is connected to the first end of the sixth resistor R6, the first end of the second capacitor C2 and the cathode of the diode D1. The second end of the resistor R5 is connected to the second end of the sixth resistor R6 and the second end of the second capacitor C2 and is grounded.

[0010] According to another aspect of the present invention, a PD power supply is provided, comprising the circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage as described above.

[0011] The circuit for adjusting AC-DC output voltage based on DC-DC output voltage provided by the utility model has the following beneficial effects: In the circuit for adjusting AC-DC output voltage based on DC-DC output voltage provided by the utility model, a protocol circuit generates a voltage regulation signal based on load demand and the output voltage of an output module, and a DC-DC conversion circuit adjusts the output voltage under the control of the voltage regulation signal; after the output voltage changes, the following voltage regulation module adjusts the AC-DC output voltage based on the maximum value of the adjusted DC-DC output voltage, thereby achieving the AC / DC output voltage following the change in the DC-DC output voltage, thereby maintaining a relatively small difference between the DC-DC input voltage and the output voltage. Thus, when the load demand voltage changes, high conversion efficiency is achieved by maintaining a small difference between the DC-DC input voltage and the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can obtain other drawings based on the provided drawings without inventive work.

[0013] Figure 1 FIG2 is a schematic diagram of a circuit for adjusting an AC-DC output voltage based on a DC-DC output voltage according to an embodiment of the present invention;

[0014] Figure 2 FIG2 is a circuit diagram of a circuit for adjusting AC-DC output voltage based on DC-DC output voltage provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0015] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0017] Figure 1 FIG. 1 is a schematic diagram of a circuit for adjusting AC-DC output voltage based on DC-DC output voltage according to an embodiment of the present invention. Figure 1 As shown, the circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage provided by the present invention includes an AC-DC conversion circuit 10, at least one DC-DC conversion circuit 20, an output module 30, a protocol circuit 40 and a follower voltage regulation module 50. The output of the AC-DC converter circuit 10 is connected to the input of each DC-DC converter circuit 20, and is used to convert the input AC voltage into a DC voltage and transmit it to the subsequent DC-DC converter circuit; the output of each DC-DC converter circuit 20 is connected to the input of the output module 30, and the feedback of each DC-DC converter circuit 20 is connected to the protocol circuit 40, and is used to convert the input DC voltage into the DC voltage required by the load under the control of the voltage regulation signal from the protocol circuit 40 and transmit it to the output module; the input of the follower voltage regulation module 50 is connected to the output of the DC-DC converter circuit 20, and the output of the follower voltage regulation module 50 is connected to the feedback of the AC-DC converter circuit 10. The protocol circuit 40 generates a voltage regulation signal based on the output of the output module 30, and each DC-DC converter circuit 20 adjusts the output voltage according to the voltage regulation signal. The follower voltage regulation module 50 generates a follower voltage regulation signal based on the maximum value of the adjusted DC-DC output voltage, and the AC-DC converter circuit 10 adjusts the AC-DC output voltage according to the follower voltage regulation signal. In this way, the difference between the DC / DC input and output voltages can be maintained relatively small, thereby improving the DC / DC conversion efficiency. It should be noted that Figure 1Only two DC-DC converter circuits are shown in this example. In practice, multiple DC-DC converter circuits can be combined and used. When there are multiple DC-DC converter circuits, the following voltage regulator module generates a following voltage regulator signal based on the maximum DC output voltage of the multiple DC-DC converter circuits.

[0018] In this embodiment, the protocol circuit generates a voltage regulation signal based on the load demand and the output voltage of the output module. The DC-DC converter circuit adjusts the output voltage under the control of the voltage regulation signal. After the output voltage changes, the follower voltage regulation module adjusts the AC-DC output voltage based on the maximum value of the adjusted DC-DC output voltage. This allows the AC / DC output voltage to follow changes in the DC-DC output voltage, thereby maintaining a relatively small difference between the DC-DC input and output voltages. Thus, when the load demand voltage changes, high conversion efficiency is achieved by maintaining a small difference between the DC-DC input and output voltages.

[0019] Figure 2 FIG. 1 is a circuit diagram of a circuit for adjusting AC-DC output voltage based on DC-DC output voltage according to an embodiment of the present invention. Figure 2 As shown, the DC-DC conversion circuit 20 includes a DC-DC chip and a diode D1, the AC-DC conversion circuit 10 includes an AC-DC chip, a first resistor R1 and a second resistor R2, and the follower voltage regulation module 50 includes a field effect transistor Q1, a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. Among them, the positive electrode of the diode D1 is connected to the output end of the DC-DC chip; the first end of the first resistor R1 is connected to the output end of the AC-DC chip, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the feedback end of the AC-DC chip, and the second end of the second resistor R2 is grounded; the collector of the field effect transistor Q1 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the feedback end of the AC-DC chip, the emitter of the field effect transistor Q1 is connected to the first end of the first capacitor C1, the first end of the fourth resistor R4 and the output end of the AC-DC chip, the base of the field effect transistor Q1 is connected to the second end of the first capacitor C1, the second end of the fourth resistor R4 and the first end of the resistor R5, the second end of the resistor R5 is connected to the first end of the sixth resistor R6, the first end of the second capacitor C2 and the negative electrode of the diode D1, and the second end of the resistor R5 is connected to the second end of the sixth resistor R6 and the second end of the second capacitor C2 is grounded. It should be noted that Figure 2 Only one DC-DC converter circuit is shown; in practice, multiple DC-DC converter circuits can be used in combination. When multiple DC-DC converter circuits are used, the output of each DC-DC converter circuit is connected to the anode of a diode D1, and the cathode of diode D1 is connected to the first end of a sixth resistor R6.

[0020] like Figure 2 As shown, diode D1, sixth resistor R6, and second capacitor C2 can extract the output voltage threshold V1 from the DC-DC converter circuit. Under the control of the voltage regulation signal from the protocol circuit, when the output voltage of the DC-DC converter circuit decreases, discharge through sixth resistor R6 causes threshold V1 to decrease synchronously. When the output voltage of the DC-DC converter circuit increases, threshold V1 increases synchronously through diode D1. Second capacitor C2 is used for synchronous anti-interference and prevents excessive fluctuations. The threshold voltages between the emitter and base of the field-effect transistor Q1 are fixed. Therefore, when the field-effect transistor Q1 is turned on, the current in the corresponding fourth resistor R4 is also fixed. This current flows through the fifth resistor R5 connected in series, so that when the voltage of the fourth resistor R4 and the fifth resistor R5 connected in series reaches a fixed voltage, the field-effect transistor Q1 will be turned on. That is, when the voltage difference between V0 and V1 is greater than a fixed preset value, the field-effect transistor Q1 will be turned on. When the field-effect transistor Q1 is turned on, the voltage of V0 will drop, thereby reaching an equilibrium state. The voltage difference between V0 and V1 maintains the set fixed difference, so that V0 is adjusted according to the voltage change of V1.

[0021] Furthermore, if Figure 2 As shown, when FET Q1 is off, the upper limit of the output voltage of the AC-DC converter circuit can be set by connecting first resistor R1 between the output terminal and the feedback terminal of the AC-DC chip and second resistor R2 between the feedback terminal of the AC-DC chip and ground. When FET Q1 is fully on, the lower limit of the output voltage of the AC-DC converter circuit can be set by connecting first resistor R1, third resistor R3, and second resistor R2.

[0022] Based on the same concept, the present invention also claims protection for a PD power supply, comprising a battery, a single-chip microcomputer, and a circuit for adjusting the AC-DC output voltage based on the DC-DC output voltage as described in the above embodiments, wherein the single-chip microcomputer is communicatively connected to the AC / DC and DC / DC chips, respectively. Conventional circuits such as battery temperature detection, indicator lights, and touch control, which are separately connected to the single-chip microcomputer, may also be included.

[0023] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0024] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various invention aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, invention aspects lie in less than all of the features of the individual embodiments disclosed above. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0025] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination.

[0026] It should be noted that the above embodiments illustrate rather than limit the present invention, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbols placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A circuit for adjusting an AC-DC output voltage based on a DC-DC output voltage, characterized in that: The invention comprises an AC-DC conversion circuit (10), at least one DC-DC conversion circuit (20), an output module (30), a protocol circuit (40) and a follower voltage regulation module (50), wherein the output end of the AC-DC conversion circuit (10) is connected to the input end of each DC-DC conversion circuit (20), the output end of each DC-DC conversion circuit (20) is connected to the input end of the output module (30) and the input end of the follower voltage regulation module (50), the output end of the follower voltage regulation module (50) is connected to the feedback end of the AC-DC conversion circuit (10), and the output end of the follower voltage regulation module (50) is connected to the feedback end of the AC-DC conversion circuit (10). The output end of the module (30) is connected to the input end of the protocol circuit (40), and the protocol circuit (40) is also connected to the feedback end of each DC-DC conversion circuit (20). The protocol circuit (40) generates a voltage regulation signal according to the output of the output module (30), and each DC-DC conversion circuit (20) adjusts the output voltage according to the voltage regulation signal. The following voltage regulation module (50) generates a following voltage regulation signal according to the maximum value of the adjusted DC-DC output voltage, and the AC-DC conversion circuit (10) adjusts the AC-DC output voltage according to the following voltage regulation signal.

2. The circuit for adjusting AC-DC output voltage based on DC-DC output voltage according to claim 1, wherein: The DC-DC conversion circuit (20) comprises a DC-DC chip and a diode D1, wherein the positive electrode of the diode D1 is connected to the output end of the DC-DC chip, and the negative electrode of the diode D1 is connected to the follower voltage regulation module (50).

3. The circuit for adjusting AC-DC output voltage based on DC-DC output voltage according to claim 2, wherein: The AC-DC conversion circuit (10) comprises an AC-DC chip, a first resistor R1 and a second resistor R2, wherein a first end of the first resistor R1 is connected to an output end of the AC-DC chip, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a feedback end of the AC-DC chip, and a second end of the second resistor R2 is grounded.

4. The circuit for adjusting AC-DC output voltage based on DC-DC output voltage according to claim 3, wherein: The follower voltage regulation module (50) comprises a field effect tube Q1, a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, wherein the collector of the field effect tube Q1 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the feedback end of the AC-DC chip, the emitter of the field effect tube Q1 is connected to the first end of the first capacitor C1, the first end of the fourth resistor R4 and the output end of the AC-DC chip, the base of the field effect tube Q1 is connected to the second end of the first capacitor C1, the second end of the fourth resistor R4 and the first end of the resistor R5, the second end of the resistor R5 is connected to the first end of the sixth resistor R6, the first end of the second capacitor C2 and the cathode of the diode D1, and the second end of the resistor R5 is connected to the second end of the sixth resistor R6 and the second end of the second capacitor C2 and is grounded.

5. A PD power supply, characterized in that: The invention comprises a circuit for adjusting an AC-DC output voltage based on a DC-DC output voltage as claimed in any one of claims 1 to 4.

Images