CN101483390A - Power supply device capable of adjusting output voltage - Google Patents

Abstract

A power supply device capable of adjusting output voltage receives an input voltage to generate at least one output voltage, and comprises at least one output transformer, at least two rectifying and filtering circuits and a voltage adjusting transformer. The output transformer comprises at least one group of input coils for receiving the input voltage and at least two groups of output coils for respectively carrying out voltage conversion on the input voltage. The two rectifying and filtering circuits respectively rectify and filter the voltages generated by the at least two groups of output coils to respectively generate an output voltage. The voltage regulating transformer comprises at least one group of primary side coils and at least one group of secondary side coils, wherein the primary side coils are connected with one group of output coils of the output transformer in parallel, and the secondary side coils are connected with the other group of output coils of the output transformer in series so as to regulate the output voltage of a rectifying and filtering circuit connected with the other group of output coils.

Description

Power supply device with adjustable output voltage

technical field

The invention relates to a power supply device, in particular to a power supply device with adjustable output voltage.

Background technique

Since the internal components of most electronic devices such as televisions, monitors, stereos, and computers use different DC voltages, in electronic devices, the input voltage is usually converted by a switching power supply that can input DC voltage. The DC voltage is converted into different output voltages for use by various internal components in the electronic device.

However, due to the output transformer used in the previous switching power supply, the induced voltage per turn of the output coil is too large (usually 1.5V-6V per turn, depending on the circuit structure and design parameters), so that the generated output voltage is different from There is a drop in the actual voltage required by the load circuit. Therefore, the conventional switching power supply, such as the LLC half-bridge power supply 1 shown in FIG. 1 , requires an additional DC-DC converter (DC-DC converter) 20, Or, for example, the LLC half-bridge power supply 2 shown in FIG. 2 needs to use a linear voltage regulator (Linear regulator) 30 to adjust its output voltage value so as to generate the voltage required by the internal components of the electronic device.

The detailed circuit of the previous DC-DC converter can be found in the controller specification of model LTC1624 produced by LINEAR TECHNOLOGY. In the past, the linear voltage regulator can refer to the voltage regulator of the model LM117QML produced by National Semiconductor.

However, the use of DC-DC converters is prone to radiation (RFI) issues in addition to high cost and circuit complexity. The linear rectifier can only be used to step down, and the power conversion efficiency is poor, especially when the gap between the output voltage and the input voltage is larger, because all the levels of the input voltage higher than the output voltage are dissipated in the form of heat, except that it cannot be used for the output circuit. In addition to the application, it is often necessary to connect an external heat sink to accelerate heat dissipation.

It can be seen that the above-mentioned existing power supply device obviously still has inconveniences and defects in structure and use, and needs to be further improved urgently. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general products have no suitable structure to solve the above-mentioned problems. This is obviously related. The problem that the industry is eager to solve. Therefore, how to create a new power supply device with adjustable output voltage is one of the current important research and development topics, and has also become a goal that the industry needs to improve.

In view of the defects existing in the above-mentioned existing power supply devices, the inventor, based on years of rich practical experience and professional knowledge engaged in the design and manufacture of such products, and in conjunction with the application of academic theories, actively researches and innovates in order to create a new possible The power supply device for adjusting the output voltage can improve the general existing power supply device and make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The main purpose of the present invention is to overcome the defects of the existing power supply device and provide a new power supply device with adjustable output voltage. The technical problems to be solved are to make it have high conversion efficiency, simple circuit structure and Low and the output voltage can be adjusted arbitrarily, which is more suitable for practical use.

Therefore, the power supply device with adjustable output voltage of the present invention receives an input voltage to generate at least one output voltage, and the power supply device includes at least one output transformer, at least two rectifying and filtering circuits and a voltage adjusting transformer.

The output transformer includes at least one set of input coils receiving the input voltage and at least two sets of output coils for voltage conversion of the input voltage respectively.

The two rectifying and filtering circuits respectively rectify and filter the voltages generated by the at least two groups of output coils to generate an output voltage respectively.

The voltage regulating transformer includes at least one set of primary side coils and at least one set of secondary side coils, the primary side coil is connected in parallel with one set of output coils of the output transformer, and the secondary side coil is connected with the other set of output transformers One set of output coils is connected in series to adjust the output voltage of the rectification filter circuit connected to the other set of output coils.

Preferably, the power supply device with adjustable output voltage is a flyback circuit, and the output transformer has a set of input coils.

Preferably, the power supply device is a forward circuit, and the output transformer has a set of input coils.

Preferably, the power supply device can be a half-bridge circuit, a full-bridge circuit, a half-bridge LLC series resonant circuit, a full-bridge LLC series resonant circuit or a push-pull circuit structure, and each set of output transformers The coil is center-tapped and divided into a first coil and a second coil, and the voltage adjusting transformer includes at least two sets of secondary side coils respectively corresponding to the first coil and the second coil.

Preferably, the power supply device adopts an LLC half-bridge circuit structure, which includes an output transformer with one set of input coils and two sets of output coils, and two first coils respectively connected to the two sets of output coils of the output transformer. A rectification filter circuit, a voltage adjustment transformer and a second rectification filter circuit; the voltage adjustment transformer includes a set of primary side coils and two sets of secondary side coils connected to the second rectification filter circuit, the primary side coil and the output transformer One of the output coils is connected in parallel to obtain the voltage on the output coil, and the two sets of secondary side coils respectively convert the voltage on the primary side coil and are respectively connected in series to the output coils receiving the adjusted voltage and undergo the second rectification and filtering The circuit is rectified and filtered to generate a first output voltage, and the voltage generated by another set of output coils of the output transformer is rectified and filtered by the first rectifier and filter circuit to generate a second output voltage, and the output voltage is the first output voltage summed with this second output voltage.

In addition, another power supply device with adjustable output voltage of the present invention accepts a DC input voltage to generate a DC output voltage. The power supply device includes an output transformer, a rectification filter circuit and a voltage adjustment transformer.

The output transformer includes a set of input coils for receiving the input voltage and a set of output coils for voltage conversion of the input voltage.

The rectifying and filtering circuit is used for rectifying and filtering the voltage generated by the output coil to generate the output voltage.

The voltage regulating transformer includes a set of primary side coils and at least one set of secondary side coils, the primary side coil is connected in parallel with the output coil of the output transformer, and the secondary side coil is connected in series with the output coil of the output transformer for Adjust the output voltage of the rectification filter circuit.

It can be seen from the above that the present invention is a power supply device with adjustable output voltage, which receives an input voltage to generate at least one output voltage, and the power supply device includes at least one output transformer, at least two rectifying and filtering circuits and a voltage adjusting transformer. The output transformer includes at least one set of input coils receiving the input voltage and at least two sets of output coils for voltage conversion of the input voltage respectively. The two rectifying and filtering circuits respectively rectify and filter the voltages generated by the at least two groups of output coils to generate an output voltage respectively. The voltage regulating transformer includes at least one set of primary side coils and at least one set of secondary side coils, the primary side coil is connected in parallel with one set of output coils of the output transformer, and the secondary side coil is connected with the other set of output transformers One set of output coils is connected in series to adjust the output voltage of the rectification filter circuit connected to the other set of output coils.

By means of the above-mentioned technical solution, the power supply device with adjustable output voltage of the present invention has at least the following advantages: the power supply device with adjustable output voltage of the present invention utilizes a voltage adjustment transformer to be properly connected to the output coil of the output transformer (for example, the dot terminal is forward connection or reverse connection), and properly design the turns ratio of the primary side coil of the voltage adjusting transformer to the secondary side coil so that the voltage generated on the secondary side coil is added to the voltage generated on the output coil of the output transformer or The output voltage of the power supply device is appropriately boosted or stepped down to a predetermined voltage value, so as to meet the output voltage demand of the load circuit at the output end.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic circuit diagram of a conventional LLC half-bridge power supply using a DC-DC converter.

FIG. 2 is a schematic circuit diagram of a conventional LLC half-bridge power supply using a linear voltage regulator.

FIG. 3 is a schematic circuit diagram of a first preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts a flyback circuit structure.

FIG. 4 is a schematic circuit diagram of a second preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts a forward circuit structure.

FIG. 5 is a schematic circuit diagram of a third preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts a forward circuit structure.

FIG. 6 is a schematic circuit diagram of a fourth preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts a half-bridge circuit structure.

FIG. 7 is a schematic circuit diagram of a fifth preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts an LLC half-bridge circuit structure.

FIG. 8 is a schematic circuit diagram of a sixth preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts an LLC half-bridge circuit structure.

FIG. 9 is a schematic circuit diagram of a seventh preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts an LLC half-bridge circuit structure.

FIG. 10 is a schematic circuit diagram of an eighth preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts a push-pull circuit structure.

FIG. 11 is a schematic circuit diagram of a ninth preferred embodiment of a power supply device with adjustable output voltage according to the present invention. This embodiment adopts an LLC half-bridge circuit structure.

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, Features and their functions are described in detail below.

Referring to Fig. 3, it is the first preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 3 of this embodiment adopts a flyback circuit structure, which mainly includes an output transformer 31, two rectifiers filter circuits 32 , 33 and a voltage regulating transformer 34 .

The output transformer 31 includes a set of input coils 311 and two sets of output coils 312 , 313 . The output coils 312, 313 have different turn ratios to the input coil 311, and the rectification and filter circuits 32, 33 are respectively connected to the output coils 312, 313 to rectify and filter the voltages generated on the output coils 312, 313 respectively, and Two different output voltages V _O1 and V _O2 are generated.

The non-dotted end of the input coil 311 is connected to a DC input voltage V _in , the dotted end (positive end) of the input coil 312 is connected to a transistor switch 35 , and the transistor switch 35 is controlled by a PWM controller 36 to timely make the input voltage V _in enters the input coil 311 .

The output coil 312 performs voltage conversion according to the turns ratio with the input coil 311, and the rectification filter circuit 32 is connected in parallel with the positive (dot end) and negative ends of the output coil 312, so as to rectify and filter the voltage on the output coil 312 produces an output voltage V _O1 .

However, since the voltage value of the output voltage V _O1 or V _O2 often does not meet the actual needs of the load circuit, in order to adjust the output voltage V _O2 to meet the actual needs of the load circuit, the voltage adjustment transformer 34 of this embodiment includes a set of primary A side coil 341 and a set of secondary side coils 342 . The primary side coil 341 is connected in parallel with the output coil 312 of the output transformer 31, and the secondary side coil 342 is connected in series between another group of output coils 313 of the output transformer 31 and the rectification filter circuit 33, and the output coils 312, 313, the primary side The dots of the coil 341 and the secondary side coil 342 are all at the same end (forward connection). Therefore, the output coil 313 converts the voltage according to the turns ratio of the input coil 311 to generate a voltage V _O21 , and at the same time, the primary side coil 341 obtains the voltage on the output coil 312 and transmits the voltage through the secondary side coil 342 and the primary side coil 341 . With a preset turns ratio, the voltage on the primary side coil 341 is converted into voltage, and the voltage V _O22 is generated on the secondary side coil 342, and is added to the voltage V _O2 generated on the output coil 313 (forward connection) , and then rectified and filtered by the rectifying and filtering circuit 33 to generate the output voltage V _O2 .

From the above description, it can be known that by virtue of the relationship between the voltage regulation transformer 34 and the output coils 312, 313 connected in the forward direction (connected at the same end) and the appropriate design of the turns ratio of the primary side coil 341 and the secondary side coil 342, the secondary side The voltage V _O22 generated on the coil 342 is added to the voltage V _O21 generated on the output coil 313, the output voltage V _O2 can be boosted to a predetermined voltage value, and the load circuit (not shown) at the output end can meet the requirements of the output voltage. need.

Referring again to FIG. 4 , it is the second preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 4 with adjustable output voltage in this embodiment adopts a forward circuit structure, which includes a An output transformer 41 with one set of input coils 411, one set of reset coils 412, two sets of output coils 413, 414, two rectification and filtering circuits 42, 43 respectively connected to the output coils 413, 414, and a voltage adjustment transformer 44 . The positive end (dot end) of the input coil 411 is connected to an input voltage V _in , and its negative end is connected to a transistor switch 45 , which is controlled by a PWM controller 46 to timely send the input voltage V _in to the input coil 411.

As in the first embodiment, the primary side coil 441 of the voltage regulating transformer 44 is connected in parallel with the output coil 413, and the secondary side coil 442 is connected in series between the output coil 414 and the rectification filter circuit 43. The only difference is that the secondary side coil 442 The dotted end of the output coil 414 is reversed (reversely connected), so the voltage V _O22 generated on the secondary side coil 442 will be subtracted from the voltage V _O21 on the output coil 414, so that the output voltage V _O2 drops pressure.

Therefore, it can be seen from the above description that if the output voltage V _O2 is to be boosted, the _dotted end of the secondary side coil 442 and the dotted end of the output coil 414 should be connected in the same direction (forward connection). voltage, then make the dotted end of the secondary side coil 442 and the dotted end of the output coil 414 reversed (reversely connected), and the purpose of stepping up/down voltage can be achieved.

Referring to Fig. 5, it is the third preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 5 of this embodiment adopts a forward circuit structure, and its circuit components are the same as those of the second preferred embodiment Same, the only difference is that the voltage regulating transformer 44 is connected to the output coil 414, that is, the primary side coil 441 is connected in parallel with the output coil 414 to obtain the voltage V _O21 on the output coil 414, while the secondary side coil 442 is connected in series to the output coil Between the dotted end of 414 and the rectifier filter circuit 43, and the dotted end of the secondary side coil 442 is in the same direction as the dotted end of the output coil 414 (forward connection), and the primary side coil is compared with the number of turns of the primary side coil The voltage on 441 is converted to generate a voltage V _O22 which is added to the voltage V _O21 on the output coil 414 and rectified and filtered by the rectifying and filtering circuit 43 to obtain an output voltage V _O2 .

It can be seen from the description of the above embodiments that the voltage regulating transformer 44 can not only connect the primary side coil 441 and the secondary side coil 442 to different output coils 413 and 414 respectively, so as to utilize the voltage on one set of output coils (such as the output coil 413) To adjust the output voltage V _O2 of the rectifier filter circuit 43 connected with another group of output coils (such as output coil 414), its primary side coil 441 and secondary side coil 442 can also be connected to the same output coil (such as output coil 414) at the same time 414), to adjust the output voltage V _O2 by taking the voltage of the same output coil 414 itself.

Referring to Fig. 6 again, it is the fourth preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 6 of this embodiment adopts a half-bridge circuit structure, which includes an output transformer 61, two Filter circuits 62 , 63 and a voltage adjusting transformer 64 .

The output transformer 61 has a set of input coils 611 and two sets of output coils 612 and 613 . The dot end of the input coil 611 is connected to two transistor switches 66 and 67 controlled on/off by a PWM controller 65 to send the input voltage V _in to the input coil 611 in good time.

The difference between this embodiment and the above-mentioned embodiment is that two sets of output coils 612, 613 of the output transformer 61 are center-tapped (grounded) and divided into a first coil 614, 615 and a second coil 616, 617, so this embodiment The example voltage regulating transformer 64 needs to include a set of primary side coils 641 and two sets of secondary side coils 642 , 643 . The primary side coil 641 is connected in parallel with one set of output coils, for example, both ends of the output coil 612 to obtain the voltage on the output coil 612, and one set of secondary side coils 642 is connected in series with the first coil 615 of the other set of output coils 613 Between the rectifier and filter circuit 63, another group of secondary side coils 643 is connected in series between the second coil 617 of the other group of output coils 613 and the rectifier filter circuit 63, and the secondary side coils 642, 643 The dot ends are all in the same direction (forward connection) with the first coil 615 and the second coil 617, so the secondary side coils 642, 643 respectively convert the voltage on the primary side coil 641, and respectively connect with the first coil 615 and the second coil The voltages on 617 are added to boost the output voltage V _O1 generated after being rectified and filtered by the rectifying and filtering circuit 63 , so as to achieve the function of adjusting the output voltage V _O1 .

Referring to Fig. 7, it is the fifth preferred embodiment of the power supply device with adjustable output voltage of the present invention. The difference between the power supply device 7 of this embodiment and the fourth embodiment above is that it adopts an LLC half-bridge circuit architecture. As for The operation mode of the voltage adjusting transformer 74 is exactly the same as that of the fourth embodiment, and will not be repeated here.

Referring to FIG. 8 , it is the sixth preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 7 of this embodiment, like the fifth embodiment, also adopts the LLC half-bridge circuit structure, and its only difference from the first The difference of the five preferred embodiments is that the primary side coil 741 of the voltage regulating transformer 74 is connected in parallel with the positive (dot end) and the ground end of the first coil 714 of one of the output coils 712 of the output transformer 71 to obtain the first The voltage on the coil 714 is used for voltage conversion by the secondary side coils 742 and 743 to adjust the output voltage V _O2 .

Referring to Fig. 9, it is the seventh preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 8 of this embodiment is a variation embodiment of the fifth embodiment, that is, this embodiment also adopts LLC Half-bridge circuit structure, but in addition to including an output transformer 81, two first rectification and filtering circuits 82, 83 connected to two sets of output coils 812, 813 of the output transformer 81, and a voltage adjustment transformer 84, and the second The difference of the fifth embodiment is that it further includes a second rectification and filtering circuit 85 connected to the voltage adjustment transformer 84 .

The voltage regulating transformer 84 includes a set of primary side coils 841 and two sets of secondary side coils 842, 843. The primary side coil 841 is connected in parallel with the output coil 812 of the output transformer 81 to obtain the voltage on the output coil 812. The secondary side coil 842 , 843 are used to respectively convert the voltage on the primary side coil 841 and rectify and filter through the second rectifying and filtering circuit 85 to generate a first output voltage V _O21 , and output the first coil 814 and the second output coil 813 of the transformer 81 at the same time The voltage generated by the coil 815 converting the voltage of the output coil 812 is rectified and filtered by the first rectifying and filtering circuit 83 to generate a second output voltage V _O22 , and the first output voltage V _O21 and the second output voltage V _O22 are superimposed to make the output voltage V _O2 is boosted.

Referring to Fig. 10 again, it is the eighth preferred embodiment of the power supply device with adjustable output voltage of the present invention. The power supply device 9 of this embodiment adopts a push-pull circuit structure, which includes an output transformer 91, two rectifiers Filter circuits 92, 93 and a voltage adjustment circuit 94, the output transformer 91 has a set of input coils 911 for inputting the input voltage V _in , and two sets of output coils 912, 913 for voltage conversion of the input voltage respectively, the output coils 912, 913 is the center tap (ground).

The input coil 911 includes a first input coil 914 and a second input coil 915. The two ends of the input coil 911 are respectively connected to two transistor switches 96 and 97 controlled by a PWM controller 95 to determine the input voltage V _in Input from the first input coil 914 or input from the second input coil 915 . The output coil 912 performs voltage conversion on the input voltage V _in according to the turns ratio between the output coil 912 and the input coil 914 , and then rectifies and filters the rectification and filtering circuit 92 to generate an output voltage V _O1 .

The voltage adjustment circuit 94 includes a group of primary side coils 941 and two groups of secondary side coils 942, 943. The primary side coil 941 is connected in parallel with the positive and negative ends of the output coil 912 to obtain the voltage on the output coil 912. The secondary side coil 942 It is connected in series between the first coil 916 of the output coil 913 and the rectification filter circuit 93, to convert the voltage on the primary side coil 941, and superimpose with the voltage on the first coil 914 (the dot end is in the same direction). The secondary side coil 943 is connected in series between the second coil 917 of the output coil 913 and the rectification filter circuit 93, in order to convert the voltage on the primary side coil 941 and superimpose with the voltage on the second coil 917 (the dot end is in the same direction ), and then rectified and filtered by the rectifying and filtering circuit 93 to obtain the output voltage V _O2 .

Referring also to FIG. 11 , it is the ninth preferred embodiment of the power supply device with adjustable output voltage according to the present invention. The power supply device 10 of this embodiment adopts the same LLC half-bridge circuit structure as the fifth embodiment above, wherein the main The difference is that the output transformer 11 of this embodiment has three sets of output coils 111, 112 and 113 with different numbers of coils, and three sets of rectifying and filtering circuits 12, 13, 14. The rectification and filtering circuits 12, 13, and 14 respectively rectify and filter the voltages generated on the output coils 111, 112, and 113 to generate three different DC output voltages V _O1 , V _O2 , and V _O3 . And the voltage regulating transformer 15 of the present embodiment includes a group of primary side coils 151 connected in parallel with the output coil 111, and four groups of secondary side coils 152, 153, 154, 155 (the number of turns of the coils depends on the actual demand, and is not limited. same).

And as described in the previous embodiment for the working principle of the voltage regulating transformer, the secondary side coils 152 and 153 are respectively connected in series between the first coil 114 and the second coil 115 of the output coil 112 and the rectification filter circuit 13, which can adjust the rectification The output voltage V _O2 of the filter circuit 13, and the secondary side coils 154, 155 are respectively connected in series between the first coil 116 and the second coil 117 of the output coil 113 and the rectification filter circuit 14, which can adjust the rectification filter circuit 14 output voltage V _O3 .

It can be seen from the above description that for the power supply device 10 with multiple output voltages, only one voltage adjustment transformer 15 with multiple sets of secondary coils can be used to simultaneously adjust two or more output voltages.

To sum up, in most of the above-mentioned embodiments, the output transformer has two sets of output coils to generate two output voltages V _O1 and V _O2 , and a voltage adjustment transformer is used to adjust the voltage value of one of the output voltages. This is the limit, such as the ninth embodiment. Therefore, it can be seen that the power supply device disclosed in the present invention can flexibly use more than one output transformer or use an output transformer with more than two sets of output coils to generate more than two different output voltages depending on the number of output voltages actually required, and can Flexible application of more than one voltage adjustment transformer to adjust the voltage generated by the output coil of the output transformer, so that the output voltage generated by the power supply can meet the needs of the output load circuit, and solve the problem that the voltage generated by the output transformer is limited by each coil Disadvantages of excessive voltage.

In addition, compared with the aforementioned conventional DC/DC converter 20 and linear voltage regulator 30, the cost of the voltage regulating transformer used in the present invention is low and the circuit is simple, and due to the loss of the voltage regulating transformer, there are only very small magnetic losses and copper losses. , so the conversion efficiency is extremely high, generally up to 98%.

To sum up, the power supply device with adjustable output voltage in the above embodiment uses a voltage adjustment transformer to properly connect (for example, forward connection or reverse connection) with the output coil of the output transformer, and properly designs the voltage adjustment transformer. The turns ratio of the primary side coil and the secondary side coil, so that the voltage generated on the secondary side coil and the voltage generated on the output coil of the output transformer can be added or subtracted, and the output voltage of the power supply device can be properly boosted or The voltage is lowered to a predetermined voltage value to meet the output voltage requirement of the load circuit (not shown) at the output end.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, the Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (11)

1. A power supply device with adjustable output voltage, which accepts an input voltage to generate at least one output voltage, characterized in that the power supply device includes: at least one output transformer, including at least one set of input coils for receiving the input voltage and at least two sets of output coils for respectively performing voltage conversion on the input voltage; At least two rectifying and filtering circuits, used to respectively rectify and filter the voltages generated by the at least two sets of output coils, so as to generate an output voltage respectively; and A voltage regulating transformer, which includes at least one set of primary side coils and at least one set of secondary side coils, the primary side coil is connected in parallel with one set of output coils of the output transformer, and the secondary side coil is connected with one of the output transformers Another set of output coils is connected in series to adjust the output voltage of the rectification filter circuit connected to the other set of output coils. 2. The power supply device with adjustable output voltage as claimed in claim 1, wherein the power supply device is a flyback circuit, and the output transformer has a set of input coils. 3. The power supply device with adjustable output voltage as claimed in claim 1, wherein the power supply device is a forward circuit, and the output transformer has a set of input coils. 4. The power supply device with adjustable output voltage as claimed in claim 1, characterized in that: the power supply device can be a half-bridge circuit, a full-bridge circuit, a half-bridge LLC series resonant circuit, a full-bridge LLC series Resonant circuit or push-pull circuit structure, and each set of output coils of the output transformer is center-tapped and divided into a first coil and a second coil, and the voltage adjustment transformer includes corresponding to each of the first coil and the second coil At least two sets of secondary side coils. 5. The power supply device with adjustable output voltage according to claim 1, characterized in that: the power supply device adopts an LLC half-bridge circuit structure, which includes an output transformer with one set of input coils and two sets of output coils , two first rectifying and filtering circuits respectively connected to two sets of output coils of the output transformer, a voltage adjusting transformer and a second rectifying and filtering circuit; the voltage adjusting transformer includes a set of primary side coils and two sets of connecting the second The secondary side coil of the rectification filter circuit, the primary side coil is connected in parallel with one of the output coils of the output transformer to obtain the voltage on the output coil, and the two sets of secondary side coils respectively convert the voltage on the primary side coil and They are respectively connected in series to the output coils receiving the adjusted voltage and are rectified and filtered by the second rectifying and filtering circuit to generate a first output voltage. The voltage generated by the other set of output coils of the output transformer is rectified and filtered by the first rectifying and filtering circuit to generate a second output voltage, so that the output voltage is the sum of the first output voltage and the second output voltage. 6. The power supply device with adjustable output voltage as claimed in claim 1, wherein the input voltage is a DC voltage. 7. A power supply device with adjustable output voltage, which accepts an input voltage to generate an output voltage, characterized in that: The power supply unit includes: An output transformer comprising a set of input coils for receiving the input voltage and a set of output coils for voltage conversion of the input voltage; A rectification and filtering circuit, used to rectify and filter the voltage generated by the output coil to generate the output voltage; and A voltage regulating transformer, comprising a set of primary side coils and at least one set of secondary side coils, the primary side coil is connected in parallel with the output coil of the output transformer, and the secondary side coil is connected in series with the output coil of the output transformer, for To adjust the output voltage of the rectification filter circuit. 8. The power supply device with adjustable output voltage as claimed in claim 7, wherein the power supply device is a flyback circuit in which the output transformer has a set of input coils. 9. The power supply device with adjustable output voltage as claimed in claim 7, wherein the power supply device is a forward circuit in which the output transformer has two sets of input coils. 10. The power supply device with adjustable output voltage according to claim 7, characterized in that: the power supply device can be half-bridge, full-bridge, half-bridge LLC series resonant, full-bridge LLC series resonant or push Pull-type circuit structure, and the output coil of the output transformer is center-tapped and divided into a first coil and a second coil, and the voltage adjustment transformer includes two sets of secondary side coils respectively corresponding to the first coil and the second coil . 11. The power supply device with adjustable output voltage as claimed in claim 7, wherein the input voltage is a DC voltage.

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