Output voltage adjusting circuit and power adapter

Abstract

The utility model provides an output voltage adjusting circuit and a power adapter. The output voltage adjusting circuit comprises a control module, a switch module and a voltage adjusting module. The switch module is connected with the control module and is used for outputting a switch signal to the control module; the voltage regulation module comprises a plurality of voltage regulation circuits, the input end of each voltage regulation circuit is connected with the control module, and the output end of each voltage regulation circuit is connected with a secondary circuit of the power adapter; wherein the control module is used for controlling one voltage regulating circuit in the voltage regulating module to be switched on according to the switching signal so as to regulate the output voltage of the power adapter. According to the utility model, the output voltage of the power adapter can be adjusted to meet the requirements of more electronic devices.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to an output voltage adjustment circuit and a power adapter. Background Art

[0002] Currently, most power adapters or the output voltage of power adapters are fixed to a certain voltage, for example, a fixed output voltage of 5V, which can only charge electronic devices of corresponding specifications. However, the specifications of different electronic devices are often different, resulting in the need for multiple power adapters, which reduces convenience. Utility Model Content

[0003] The utility model provides an output voltage adjustment circuit and a power adapter, aiming to solve the problem that the output voltage of the current power adapter is fixed and cannot be adjusted.

[0004] In a first aspect, the utility model provides an output voltage adjustment circuit, which includes a control module, a switch module and a voltage adjustment module; the switch module is connected to the control module and is used to output a switch signal to the control module; the voltage adjustment module includes multiple voltage regulation circuits, the input end of each voltage regulation circuit is connected to the control module, and the output end of each voltage regulation circuit is connected to the secondary circuit of the power adapter; wherein the control module controls one of the voltage regulation circuits in the voltage adjustment module to turn on according to the switch signal to adjust the output voltage of the power adapter.

[0005] Furthermore, the multiple voltage regulating circuits include a first voltage regulating circuit and multiple second voltage regulating circuits connected in parallel with the first voltage regulating circuit; the first voltage regulating circuit is connected to the secondary circuit; the input ends of all the second voltage regulating circuits are connected to the control module, and the output ends of all the second voltage regulating circuits are connected to the secondary circuit.

[0006] Furthermore, the first voltage regulating circuit includes a first resistor, one end of the first resistor is connected to the secondary circuit, and the other end of the first resistor is grounded.

[0007] Furthermore, the second voltage regulating circuit includes a switch circuit and a resistor circuit; the input end of the switch circuit is connected to the control module, the output end of the switch circuit is connected to one end of the resistor circuit, and the other end of the resistor circuit is connected to the secondary circuit.

[0008] Furthermore, the switch circuit includes a first switch tube, a controlled end of the first switch tube is connected to the control module, a first electrode of the first switch tube is connected to the resistance circuit, and a second electrode of the first switch tube is grounded.

[0009] Furthermore, the resistance circuit includes a second resistor, one end of the second resistor is connected to the first electrode of the first switch tube, and the other end of the second resistor is connected to the secondary circuit.

[0010] Furthermore, the voltage adjustment module also includes a minimum voltage setting module, one end of which is connected to the control module and the first resistor respectively, and the other end of which is connected to the secondary circuit and the primary circuit of the power adapter respectively.

[0011] Furthermore, the minimum voltage setting module includes a second switch tube and a photocoupler, the controlled end of the second switch tube is connected to the control module, the first pole of the second switch tube is connected to one end of the photocoupler, the second pole of the second switch tube is grounded, the other end of the photocoupler is connected to the primary circuit, and the photocoupler is also connected to the secondary circuit.

[0012] Further, the minimum voltage setting module includes a third resistor, one end of the third resistor is connected to the secondary circuit, and the other end of the third resistor is connected to the first resistor.

[0013] In a second aspect, the utility model further provides a power adapter, which includes a primary circuit, a secondary circuit and the output voltage adjustment circuit described in any one of the above items.

[0014] The power adapter disclosed in the utility model includes an output voltage adjustment circuit, which includes a control module, a switch module and a voltage adjustment module. The switch module is connected to the control module, and a user can adjust the output voltage of the power adapter through the switch module. When the user switches the switch module, the switch module outputs a switch signal to the control module, and the control module controls the voltage adjustment module according to the switch signal to turn on the voltage regulation circuit that matches the switch signal, thereby adjusting the output voltage to facilitate matching with different electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a block diagram of an output voltage adjustment circuit provided by an embodiment of the utility model;

[0017] Figure 2 is a block diagram of an output voltage adjustment circuit provided by another embodiment of the utility model;

[0018] Figure 3 It is a circuit diagram of an output voltage adjustment circuit provided by an embodiment of the utility model;

[0019] Figure 4 It is a circuit diagram of a primary circuit of a power adapter provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, operations, elements, components and / or groups thereof.

[0022] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, the singular forms of "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the utility model specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0023] In addition, the directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings and the use status of the product. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0024] See also Figures 1 to 4 , Figure 1 1 is a block diagram of an output voltage adjustment circuit 100 provided in one embodiment of the present utility model; Figure 2 is a block diagram of an output voltage adjustment circuit 100 provided in another embodiment of the present invention; Figure 3 is a circuit diagram of an output voltage adjustment circuit 100 provided in an embodiment of the utility model; Figure 4 FIG. 3 is a circuit diagram of a primary circuit 300 of a power adapter provided by an embodiment of the present utility model. Figure 1 As shown, the output voltage adjustment circuit 100 includes a control module 10, a switch module 20 and a voltage adjustment module 30; the switch module 20 is connected to the control module 10 and is used to output a switch signal to the control module 10; the voltage adjustment module 30 includes a plurality of voltage regulation circuits, the input end of each of the voltage regulation circuits is connected to the control module 10, and the output end of each of the voltage regulation circuits is connected to the secondary circuit 200 of the power adapter; wherein the control module 10 controls one of the voltage regulation circuits in the voltage adjustment module 30 to be turned on according to the switch signal to adjust the output voltage of the power adapter.

[0025] Specifically, the output voltage adjustment circuit 100 includes a control module 10, a switch module 20 and a voltage adjustment module 30. The control module 10 may include a control chip, which may be a power chip of a power adapter. The switch module 20 is connected to the control module 10, and may include a control switch S1. The user can adjust the output voltage of the power adapter through the control switch S1. For example, an algorithm related to the control switch S1 may be preset in the control module 10, and the number of times the user clicks the control switch S1 corresponds to different output modes of the power adapter. That is, multiple output modes may be preset in advance, and different output modes correspond to different output voltages. For example, clicking the control switch S1 once corresponds to the first output mode, and the first output mode corresponds to an output voltage of 5V. Clicking the control switch S1 twice corresponds to the second output mode, and the second output mode corresponds to an output voltage of 9V.

[0026] The voltage adjustment module 30 includes a plurality of voltage regulating circuits, the input ends of the plurality of voltage regulating circuits are connected to the control module 10, and the output ends of the plurality of voltage regulating circuits are connected to the secondary circuit 200 of the power adapter, and are used to divide the voltage of the secondary circuit 200 to adjust the output voltage. Each voltage regulating circuit is controlled by the control module 10, and the control module 10 can independently control the conduction and shutdown of any voltage regulating circuit, thereby adjusting the output voltage.

[0027] When in use, a voltage regulating circuit can be set to correspond to an output mode. For example, three voltage regulating circuits can be included, each voltage regulating circuit corresponds to an output mode, and at least three output modes can be set. The control module 10 controls the corresponding voltage regulating circuit to be turned on to switch to the output mode corresponding to the voltage regulating circuit.

[0028] See also Figure 2 and Figure 3As a further embodiment, the plurality of voltage regulating circuits include a first voltage regulating circuit 31 and a plurality of second voltage regulating circuits 32 connected in parallel with the first voltage regulating circuit 31; the first voltage regulating circuit 31 is connected to the secondary circuit 200; the input ends of all the second voltage regulating circuits 32 are connected to the control module 10, and the output ends of all the second voltage regulating circuits are connected to the secondary circuit 200. The first voltage regulating circuit 31 includes a first resistor R1, one end of the first resistor R1 is connected to the secondary circuit 200, and the other end of the first resistor R1 is grounded.

[0029] Among them, the first voltage regulating circuit 31 can also include a first resistor R1, the first resistor R1 is connected in parallel with all the second voltage regulating circuits 32, and the first resistor R1 is also connected to the secondary circuit 200. When any second voltage regulating circuit 32 is turned on, the turned-on second voltage regulating circuit 32 and the first resistor R1 form a loop, thereby changing the resistance, and then changing the feedback voltage, thereby adjusting the output voltage.

[0030] The number of the second voltage regulating circuits 32 may be determined by the specific type of the power adapter, that is, when more different types of output voltages are needed, the number of the second voltage regulating circuits 32 may be increased, otherwise the number of the second voltage regulating circuits 32 may be reduced accordingly.

[0031] See also Figure 3 As a further embodiment, the second voltage regulating circuit 32 includes a switch circuit and a resistor circuit; the input end of the switch circuit is connected to the control module 10, the output end of the switch circuit is connected to one end of the resistor circuit, and the other end of the resistor circuit is connected to the secondary circuit 200. Further, the switch circuit includes a first switch tube Q1, the controlled end of the first switch tube Q1 is connected to the control module 10, the first electrode of the first switch tube Q1 is connected to the resistor circuit, and the second electrode of the first switch tube Q1 is grounded. Further, the resistor circuit includes a second resistor R2, one end of the second resistor R2 is connected to the first electrode of the first switch tube Q1, and the other end of the second resistor R2 is connected to the secondary circuit 200.

[0032] Each second voltage regulating circuit 32 may include a switch circuit and a resistor circuit. The switch circuit may include a switch device for controlling the on and off of the second voltage regulating circuit 32 according to the control signal of the control module 10. The resistor circuit is used to be connected in parallel with the first resistor R1. It may include at least one resistor. When the resistor circuit includes multiple resistors, the multiple resistors are connected in series. Preferably, the switch circuit includes a first switch tube Q1, and the resistor circuit includes a second resistor R2. The controlled end of the first switch tube Q1 is connected to the control module 10, the first electrode of the first switch tube Q1 is connected to one end of the second resistor R2, the second electrode of the first switch tube Q1 is grounded, and the other end of the second resistor R2 is connected to the secondary circuit 200. When any first switch tube Q1 is turned on, the second resistor R2 connected to the turned-on first switch tube Q1 is connected in parallel with the first resistor R1 to change the feedback resistance.

[0033] A plurality of output modes may be built into the control module 10, for example, Figure 3 As shown, four second voltage regulating circuits 32 may be provided, each of which includes a first switch tube Q1 and a second resistor R2, and correspondingly four output modes may be provided, and the number of key presses of the switch module 20 corresponds to the four output modes, thereby achieving adjustment of the output voltage. Figure 3 For example, Figure 3 The four second voltage regulating circuits 32 from left to right correspond to the first output mode, the second output mode, the third output mode and the fourth output mode respectively. The output voltage of each output mode can be set by setting the specific resistance value of the second resistor R2 in each second voltage regulating circuit 32. If the output voltage of the first output mode is 9V, the output voltage of the second output mode is 15V, the output voltage of the third output mode is 20V, and the output voltage of the fourth output mode is 30V, then when the user presses the switch module 20 once continuously, it switches to the first output mode, that is, the leftmost second voltage regulating circuit 32 is turned on, when the user presses the switch module 20 twice continuously, it switches to the second output mode, that is, the second left second voltage regulating circuit 32 is turned on, when the user presses the switch module 20 three times continuously, it switches to the third output mode, that is, the third left second voltage regulating circuit 32 is turned on, when the user presses the switch module 20 four times continuously, it switches to the fourth output mode, that is, the fourth left second voltage regulating circuit 32 is turned on, it can be understood that the output mode is not limited to the above four output modes, and the output voltage of each output mode is not limited to the above four output voltages.

[0034] See also Figure 3 and Figure 4As a further embodiment, the voltage adjustment module 30 further includes a minimum voltage setting module 33, one end of which is respectively connected to the control module 10 and the first resistor R1, and the other end of which is respectively connected to the secondary circuit 200 and the primary circuit 300 of the power adapter. Further, the minimum voltage setting module 33 includes a second switch tube Q2 and a photocoupler U2, the controlled end of the second switch tube Q2 is connected to the control module 10, the first pole of the second switch tube Q2 is connected to one end of the photocoupler U2, the second pole of the second switch tube Q2 is grounded, the other end of the photocoupler U2 is connected to the primary circuit 300, and the photocoupler U2 is also connected to the secondary circuit 200. Further, the minimum voltage setting module 33 includes a third resistor R3, one end of which is connected to the secondary circuit 200, and the other end of which is connected to the first resistor R1.

[0035] The minimum voltage setting module 33 includes a second switch tube Q2 and a photocoupler U2. The controlled end of the second switch tube Q2 is connected to the control module 10. The first electrode of the second switch tube Q2 is connected to one end of the photocoupler U2. The other end of the photocoupler U2 is located in the primary circuit 300. Figure 4 As shown, the other end of the photocoupler U2 is connected to the control chip U3 of the primary circuit 300 , and the third resistor R3 is connected to the first resistor R1 for voltage division.

[0036] The minimum voltage setting module 33 can be used as an output mode, and its output voltage can be 5V. When the secondary output voltage is divided by the third resistor R3 and the first resistor R1, it is fed back to the control chip U3 of the primary circuit 300 through the photocoupler U2. The control chip U3 adjusts the duty cycle of the third switch tube Q3 so that the output voltage of the secondary circuit 200 is 5V.

[0037] When the minimum voltage setting module 33 cooperates with the first voltage regulating circuit and the second voltage regulating circuit, a fine adjustment mode can be added, that is, the user can enter the fine adjustment mode by double-clicking the switch module 20. In the fine adjustment mode, each time the user presses the switch module 20, the output voltage can increase by one gear. For example, each time the switch module 20 is pressed, the output voltage increases by 0.2V, thereby meeting the needs of more electronic devices, such as Figure 3As shown, the 9-pin of the control chip U1 of the control module 10 is connected to the secondary circuit 200 and the second switch tube Q2. In the fine-tuning mode, each time the user presses the switch module 20, the voltage of the 9-pin of U1 will rise, thereby changing the feedback voltage of the optocoupler U2. U3 adjusts the duty cycle of the third switch tube Q3 according to the feedback voltage regulation, thereby adjusting the output voltage. When it is necessary to exit the fine-tuning mode, double-click the switch module 20. In addition, a voice broadcast module can also be provided, which is used to prompt the user of the current gear position of the power adapter, so that the user can understand the output voltage. At the same time, in order to avoid accidental touch, the user can lock the output mode of the power adapter by long pressing.

[0038] The utility model also provides a power adapter, which includes a primary circuit 300, a secondary circuit 200 and an output voltage adjustment circuit 100 described in any one of the above embodiments; the output voltage adjustment circuit 100 includes a control module 10, a switch module 20 and a voltage adjustment module 30; the switch module 20 is connected to the control module 10 and is used to output a switch signal to the control module 10; the voltage adjustment module 30 includes a plurality of voltage regulation circuits, the input end of each of the voltage regulation circuits is connected to the control module 10, and the output end of each of the voltage regulation circuits is connected to the secondary circuit 200 of the power adapter; wherein the control module 10 controls one of the voltage regulation circuits in the voltage adjustment module 30 to be turned on according to the switch signal to adjust the output voltage of the power adapter.

[0039] Specifically, the output voltage adjustment circuit 100 includes a control module 10, a switch module 20 and a voltage adjustment module 30. The control module 10 may include a control chip, which may be a power chip of a power adapter. The switch module 20 is connected to the control module 10, and may include a control switch S1. The user can adjust the output voltage of the power adapter through the control switch S1. For example, an algorithm related to the control switch S1 may be preset in the control module 10, and the number of times the user clicks the control switch S1 corresponds to different output modes of the power adapter. That is, multiple output modes may be preset in advance, and different output modes correspond to different output voltages. For example, clicking the control switch S1 once corresponds to the first output mode, and the first output mode corresponds to an output voltage of 5V. Clicking the control switch S1 twice corresponds to the second output mode, and the second output mode corresponds to an output voltage of 9V.

[0040] The voltage adjustment module 30 includes a plurality of voltage regulating circuits, the input ends of the plurality of voltage regulating circuits are connected to the control module 10, and the output ends of the plurality of voltage regulating circuits are connected to the secondary circuit 200 of the power adapter, and are used to divide the voltage of the secondary circuit 200 to adjust the output voltage. Each voltage regulating circuit is controlled by the control module 10, and the control module 10 can independently control the conduction and shutdown of any voltage regulating circuit, thereby adjusting the output voltage.

[0041] When in use, a voltage regulating circuit can be set to correspond to an output mode. For example, three voltage regulating circuits can be included, each voltage regulating circuit corresponds to an output mode, and at least three output modes can be set. The control module 10 controls the corresponding voltage regulating circuit to be turned on to switch to the output mode corresponding to the voltage regulating circuit.

[0042] The output voltage adjustment circuit and the power adapter disclosed by the utility model can adjust the output voltage of the power adapter through the voltage adjustment module, thereby meeting the needs of more electronic devices and improving convenience.

[0043] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An output voltage adjustment circuit, characterized in that: Applicable to power adapters, including: Control module; A switch module, the switch module is connected to the control module and is used to output a switch signal to the control module; A voltage adjustment module, the voltage adjustment module comprising a plurality of voltage adjustment circuits, the input end of each of the voltage adjustment circuits being connected to the control module, and the output end of each of the voltage adjustment circuits being connected to the secondary circuit of the power adapter; The control module controls one of the voltage regulating circuits in the voltage regulating module to conduct according to the switch signal so as to adjust the output voltage of the power adapter.

2. The output voltage regulation circuit according to claim 1, wherein: The plurality of voltage regulating circuits include a first voltage regulating circuit and a plurality of second voltage regulating circuits connected in parallel with the first voltage regulating circuit; The first voltage regulating circuit is connected to the secondary circuit; The input ends of all the second voltage regulating circuits are connected to the control module, and the output ends of all the second voltage regulating circuits are connected to the secondary circuit.

3. The output voltage adjustment circuit according to claim 2, wherein: The first voltage regulating circuit includes a first resistor, one end of the first resistor is connected to the secondary circuit, and the other end of the first resistor is grounded.

4. The output voltage regulating circuit according to claim 3, wherein: The second voltage regulating circuit includes a switch circuit and a resistor circuit; The input end of the switch circuit is connected to the control module, the output end of the switch circuit is connected to one end of the resistance circuit, and the other end of the resistance circuit is connected to the secondary circuit.

5. The output voltage regulation circuit according to claim 4, wherein: The switch circuit includes a first switch tube, a controlled end of the first switch tube is connected to the control module, a first electrode of the first switch tube is connected to the resistance circuit, and a second electrode of the first switch tube is grounded.

6. The output voltage regulating circuit according to claim 5, wherein: The resistance circuit includes a second resistor, one end of the second resistor is connected to the first electrode of the first switch tube, and the other end of the second resistor is connected to the secondary circuit.

7. The output voltage regulating circuit according to claim 3, wherein: The voltage adjustment module also includes a minimum voltage setting module, one end of which is connected to the control module and the first resistor respectively, and the other end of which is connected to the secondary circuit and the primary circuit of the power adapter respectively.

8. The output voltage regulating circuit according to claim 7, wherein: The minimum voltage setting module includes a second switch tube and a photocoupler, the controlled end of the second switch tube is connected to the control module, the first pole of the second switch tube is connected to one end of the photocoupler, the second pole of the second switch tube is grounded, the other end of the photocoupler is connected to the primary circuit, and the photocoupler is also connected to the secondary circuit.

9. The output voltage regulating circuit according to claim 8, wherein: The minimum voltage setting module includes a third resistor, one end of the third resistor is connected to the secondary circuit, and the other end of the third resistor is connected to the first resistor.

10. A power adapter, characterized in that: The invention comprises a primary circuit, a secondary circuit and an output voltage adjustment circuit as claimed in any one of claims 1 to 9.

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