Electronic device providing multiple outputs and method of manufacturing the same

Abstract

The electronic device includes: a converter including a first transformer including a primary winding and a secondary winding; a first rectifier connected to a secondary winding of the first transformer and including a diode; and a second transformer including a primary winding and a secondary winding, where the secondary winding of the first transformer is a single winding, and the primary winding of the second transformer may be connected to the secondary winding of the first transformer and a diode included in the first rectifier.

Description

Technical Field

[0001] Devices and methods consistent with the present disclosure relate to an electronic device and a method of manufacturing the same, and more particularly, to an electronic device for providing a plurality of outputs and a method of manufacturing the same. Background Art

[0002] According to the development of electronic technology, various electronic devices have been developed. In particular, display devices such as televisions (TVs) have become slimmer in recent years.

[0003] As display devices such as TVs become slimmer, a power conversion stage included in the display devices needs to have a smaller size.

[0004] In particular, the power conversion stage is required to have a lower height, and there is a need to develop a technology for controlling multiple outputs of a transformer while reducing its height, which is one of the factors affecting the height of the power conversion stage. Summary of the invention

[0005] Aspects of embodiments of the present disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0006] According to an embodiment of the present disclosure, an electronic device includes: a converter, which includes a first transformer, the first transformer including a primary-side winding and a secondary-side winding; a first rectifier, which is connected to the secondary-side winding of the first transformer and includes a diode; and a second transformer, which includes a primary-side winding and a secondary-side winding, wherein the secondary-side winding of the first transformer is a single winding, and the primary-side winding of the second transformer is connected to the node to which the secondary-side winding of the first transformer and the diode included in the first rectifier are connected.

[0007] According to an embodiment of the present disclosure, the first transformer may be a reinforcement insulation transformer, and the second transformer may be a basic insulation transformer.

[0008] According to an embodiment of the present disclosure, the second transformer may be formed with an interleaved winding structure in which a primary side winding and a secondary side winding of the second transformer are alternately wound.

[0009] According to an embodiment of the present disclosure, the first transformer may include a first winding on the secondary side and a second winding on the secondary side, the diode of the first rectifier may include a first diode and a second diode, the first rectifier may include an output capacitor, the output capacitor having a first end connected to a first end of the first winding on the secondary side of the first transformer and a first end of the second winding on the secondary side of the first transformer, the first diode may have a cathode connected to the second end of the first winding on the secondary side of the first transformer and an anode connected to the second end of the output capacitor, the second diode may have a cathode connected to the second end of the second winding on the secondary side of the first transformer and an anode connected to the second end of the output capacitor, and the primary side winding of the second transformer may have a first end connected to the cathode of the first diode and a second end connected to the cathode of the second diode.

[0010] According to an embodiment of the present disclosure, the diodes of the first rectifier may include a first diode, a second diode, a third diode and a fourth diode, the first rectifier may include an output capacitor, the first diode may have a cathode connected to the first end of the output capacitor and an anode connected to the first end of the secondary side winding of the first transformer, the second diode may have a cathode connected to the first end of the output capacitor and an anode connected to the second end of the secondary side winding of the first transformer, the third diode may have a cathode connected to the first end of the secondary side winding of the first transformer and an anode connected to the second end of the output capacitor, the fourth diode may have a cathode connected to the second end of the secondary side winding of the first transformer and an anode connected to the second end of the output capacitor, and the primary side winding of the second transformer may have a first end connected to the first end of the secondary side winding of the first transformer, and a second end connected to the second end of the secondary side winding of the first transformer.

[0011] According to an embodiment of the present disclosure, the first rectifier may include a first capacitor, a second capacitor and an output capacitor, the diode of the first rectifier may include a first diode and a second diode, the first diode may have a cathode connected to the first end of the output capacitor and an anode connected to the first end of the secondary side winding of the first transformer, the first capacitor may have a first end connected to the first end of the output capacitor and a second end connected to the second end of the secondary side winding of the first transformer, the second diode may have a cathode connected to the first end of the secondary side winding of the first transformer and an anode connected to the second end of the output capacitor, the second capacitor may have a first end connected to the second end of the secondary side winding of the first transformer and a second end connected to the second end of the output capacitor, and the second transformer may have a first end connected to the first end of the secondary side winding of the first transformer and a second end connected to the second end of the secondary side winding of the first transformer.

[0012] According to an embodiment of the present disclosure, the electronic device may further include a second rectifier connected to the secondary side winding of the second transformer.

[0013] According to an embodiment of the present disclosure, the electronic device may further include a mainboard; a backlight driver; and a backlight, wherein the first rectifier may provide a first output power to the mainboard, the second rectifier may provide a second output power to the backlight driver and / or the backlight, and the first output power may be different from the second output power.

[0014] According to an embodiment of the present disclosure, the second rectifier may include an output capacitor; a first diode having a cathode connected to a first end of the output capacitor and an anode connected to a first end of a secondary side winding of a second transformer; a second diode having a cathode connected to a first end of the output capacitor and an anode connected to a second end of the secondary side winding of the second transformer; a third diode having a cathode connected to a first end of the secondary side winding of the second transformer and an anode connected to a second end of the output capacitor; and a fourth diode having a cathode connected to a second end of the secondary side winding of the second transformer and an anode connected to a second end of the output capacitor.

[0015] According to an embodiment of the present disclosure, the second rectifier may include a resonant capacitor provided between a node to which an anode of the second diode and a cathode of the fourth diode are connected and the second end of the secondary side winding of the second transformer.

[0016] According to an embodiment of the present disclosure, the second transformer may have a smaller leakage inductance than the first transformer.

[0017] According to an embodiment of the present disclosure, a method for manufacturing an electronic device includes: forming a converter, the converter including a first transformer having a primary side winding and a secondary side winding; forming a first rectifier connected to the secondary side winding of the first transformer and including a diode; and forming a second transformer including a primary side winding and a secondary side winding, wherein the secondary side winding of the first transformer is a single winding, and the primary side winding of the second transformer is connected to a node to which the secondary side winding of the first transformer and the diode included in the first rectifier are connected.

[0018] According to an embodiment of the present disclosure, the first transformer may be a reinforced insulation transformer, and the second transformer may be a basic insulation transformer.

[0019] According to an embodiment of the present disclosure, the second transformer may be formed with a staggered winding structure in which a primary side winding and a secondary side winding of the second transformer are alternately wound.

[0020] According to an embodiment of the present disclosure, forming a first transformer may include forming a first winding on the secondary side and a second winding on the secondary side, the diode of the first rectifier may include a first diode and a second diode, forming the first rectifier may include forming an output capacitor having a first end connected to a first end of the first winding on the secondary side of the first transformer and a first end of the second winding on the secondary side of the first transformer, forming a first diode to have a cathode connected to the second end of the first winding on the secondary side of the first transformer and an anode connected to the second end of the output capacitor, and forming a second diode to have a cathode connected to the second end of the second winding on the secondary side of the first transformer and an anode connected to the second end of the output capacitor, and when forming a second transformer, the primary side winding of the second transformer may be formed to have a first end connected to the cathode of the first diode and a second end connected to the cathode of the second diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] These and / or other embodiments of the present disclosure will become apparent and more easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1a to Figure 1d A diagram used to explain the height and performance of a power conversion stage implemented in various forms.

[0023] Figure 2 is a block diagram illustrating a configuration of an electronic device according to one or more embodiments of the present disclosure.

[0024] Figure 3 is a view for explaining a circuit configuration of an electronic device according to one or more embodiments of the present disclosure.

[0025] Figure 4 is a view showing main operation waveforms of an electronic device according to one or more embodiments of the present disclosure.

[0026] Figure 5 is a view for explaining the influence of the leakage inductance of the second transformer according to one or more embodiments of the present disclosure.

[0027] Figure 6 is a view for explaining a structure of a transformer based on whether a section bobbin is used according to one or more embodiments of the present disclosure.

[0028] Figure 7 and Figure 8 is a view for explaining a structure of a first rectifier according to one or more embodiments of the present disclosure.

[0029] Fig. 9is a flowchart illustrating a method of manufacturing an electronic device according to one or more embodiments of the present disclosure. DETAILED DESCRIPTION

[0030] Various modifications may be made to the exemplary embodiments of the present disclosure. Therefore, specific exemplary embodiments are shown in the drawings and are described in detail in the specific embodiments. However, it should be understood that the present disclosure is not limited to specific exemplary embodiments, but includes all modifications, equivalents and substitutes that do not depart from the scope and spirit of the present disclosure. In addition, well-known functions or structures are not described in detail because they will obscure the present disclosure with unnecessary details.

[0031] The present disclosure provides an electronic device for providing multiple outputs while reducing the height of a transformer and a method of manufacturing the same.

[0032] Hereinafter, the present disclosure is described in detail with reference to the accompanying drawings.

[0033] Considering their functions in the present disclosure, currently widely used general terms are selected as the terms used in the embodiments of the present disclosure, and may be changed based on the intention of those skilled in the art or the emergence of judicial precedents, new technologies, etc. In addition, in certain cases, there may be terms arbitrarily selected by the applicant. In this case, the meaning of such terms is mentioned in detail in the corresponding description of the present disclosure. Therefore, the terms used in the embodiments of the present disclosure need to be defined based on the meaning of the terms and content throughout the present disclosure rather than the simple names of the terms.

[0034] In the present disclosure, expressions “having”, “may have”, “including”, “may include”, etc. indicate the existence of corresponding features (e.g., values, functions, operations, or components such as parts), and do not exclude the existence of additional features.

[0035] The expression “at least one of A or / and B” may mean “A or B” or “both A and B”.

[0036] The expressions "first", "second", etc. used in the present disclosure may indicate various components regardless of the order or importance of the components. These expressions are only used to distinguish one component from another component and do not limit the corresponding components.

[0037] Unless otherwise clearly stated in the context, singular terms may include their plural forms. It should be understood that the terms "comprising", "formed by...", etc. used in this application specify the existence of features, numbers, steps, operations, components, parts, or combinations thereof mentioned in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0038] In the specification, a term such as “user” may refer to a person who uses an electronic device or a device (eg, an artificial intelligence electronic device) that uses the electronic device.

[0039] Hereinafter, various embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0040] Figure 1a to Figure 1d A diagram used to explain the height and performance of a power conversion stage implemented in various forms.

[0041] As electronic devices such as televisions (TVs) have recently become slimmer, it is necessary to reduce the height of a power conversion stage. The height of a power conversion stage may generally be determined by a transformer included in the power conversion stage. The transformer requires enhanced insulation between its primary side winding and secondary side winding, and therefore cannot allow the primary side winding and the secondary side winding to overlap each other, and needs to use a segmented bobbin, which results in a higher height thereof.

[0042] In order to solve this height problem, the transformer can be formed by a printed circuit board (PCB) winding method using a multilayer board. However, in the case of applying this multi-winding structure to obtain multiple outputs, the number of layers of the PCB may be increased to increase the price of the electronic device. Alternatively, the transformer can be formed by using a flat winding to manufacture the winding and using a planar core structure. However, it is difficult to reduce the height of the transformer because the stacking layers of the flat winding increase.

[0043] Figure 1a 1 is a diagram showing a circuit according to one or more embodiments, in which a DC-DC converter of a power conversion stage uses a multi-winding transformer to control multiple outputs. In the case of using a multi-winding transformer, the number of primary-side switches, resonant tanks, and transformers can be reduced, which is advantageous in terms of the size and price of the electronic device. However, as Figure 1b As shown in FIG. 1 , since the number of secondary-side windings of the transformer increases, the height of the transformer may increase. Therefore, it may be difficult to apply the transformer to a slim DC / DC converter.

[0044] Figure 1c 1 is a view showing a circuit according to one or more embodiments, wherein the circuit controls multiple outputs by using a single-winding transformer. In detail, the circuit uses a method of using two isolated DC / DC converters. However, this method also uses more than one isolated converter, which is disadvantageous in terms of the volume and price of the electronic device.

[0045] Figure 1d1 is a diagram showing a circuit according to one or more embodiments, wherein the circuit controls multiple outputs by using a single-winding transformer. In detail, the circuit uses a method of controlling each output by adding a separate DC / DC converter to an output stage. Here, Figure 1c However, for the backlight unit, it is necessary to boost the voltage to a high voltage, which significantly reduces the efficiency when the DC / DC converter is designed for this purpose.

[0046] Alternatively, a multi-winding transformer can be formed by reducing the height of the transformer core and widening its horizontal and vertical lengths. However, due to technical limitations, it is difficult to manufacture a transformer core with a lower height and wider horizontal and vertical lengths and thus weak strength. Even after implementation, the transformer may have a very large winding leakage inductance, which results in a very poor cross regulation characteristic.

[0047] Hereinafter, the specification describes a circuit that can more efficiently control multiple outputs while using a single-winding transformer.

[0048] Figure 2 is a block diagram illustrating a configuration of an electronic device 100 according to one or more embodiments of the present disclosure.

[0049] The electronic device 100 is a device that supplies power, and may be a component of a display device such as a TV, a monitor, or a digital signage. However, the present disclosure is not limited thereto, and the electronic device 100 may be any device as long as the device supplies power. For example, the electronic device 100 may be a component of a device that is not equipped with a display.

[0050] like Figure 2 As shown, the electronic device 100 may include a converter 110 , and the converter 110 includes a first transformer, a first rectifier 120 , and a second transformer 130 .

[0051] The converter 110 may include a first transformer. Here, the secondary side winding of the first transformer may be a single winding. The first transformer may have a single winding structure, and the height of the transformer may be lower than that of a multi-winding structure. The first transformer may be a reinforced insulation transformer.

[0052] The first rectifier 120 may be connected to the secondary side winding of the first transformer. The first rectifier 120 may be implemented as one of a center tap rectifier, a full bridge rectifier, and a voltage doubler rectifier. However, the present disclosure is not limited thereto, and the first rectifier may be implemented in various forms.

[0053] The second transformer 130 may have a primary side winding connected to the node to which the secondary side winding of the first transformer and the diode included in the first rectifier 120 are connected. Here, the second transformer 130 may be a basic insulation transformer that does not require enhanced insulation because the second transformer is connected to the secondary side of the first transformer. In addition, the second transformer 130 may not need to use a segmented bobbin and may be a transformer having an interleaved winding structure in which its primary side winding and secondary side winding are alternately wound. Therefore, the second transformer 130 may have a lower height and a lower leakage inductance. For example, the second transformer 130 may have a smaller leakage inductance than the first transformer. Therefore, the second transformer 130 may be less affected by the cross-regulation problem of the output.

[0054] The first rectifier 120 may be implemented as a center-tapped rectifier. For example, the first rectifier 120 may include: an output capacitor having one end connected to one end of the secondary-side first winding of the first transformer and one end of the secondary-side second winding of the first transformer; a first diode having a cathode connected to the other end of the secondary-side first winding of the first transformer and an anode connected to the other end of the output capacitor; and a second diode having a cathode connected to the other end of the secondary-side second winding of the first transformer and an anode connected to the other end of the output capacitor. In this case, the primary-side winding of the second transformer 130 may have one end connected to the cathode of the first diode and the other end connected to the cathode of the second diode.

[0055] The first rectifier 120 may be implemented as a full-bridge rectifier. For example, the first rectifier 120 may include: an output capacitor; a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary winding of the first transformer; a second diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary winding of the first transformer; a third diode having a cathode connected to one end of the secondary winding of the first transformer and an anode connected to the other end of the output capacitor; and a fourth diode having a cathode connected to the other end of the secondary winding of the first transformer and an anode connected to the other end of the output capacitor. In this case, the primary winding of the second transformer 130 may have one end connected to one end of the secondary winding of the first transformer, and the other end connected to the other end of the secondary winding of the first transformer.

[0056] The first rectifier 120 may be implemented as a voltage doubler rectifier. For example, the first rectifier 120 may include: an output capacitor; a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary winding of the first transformer; a first capacitor having one end connected to one end of the output capacitor and another end connected to the other end of the secondary winding of the first transformer; a second diode having a cathode connected to one end of the secondary winding of the first transformer and an anode connected to the other end of the output capacitor; and a second capacitor having one end connected to the other end of the secondary winding of the first transformer and another end connected to the other end of the output capacitor. In this case, the primary winding of the second transformer 130 may have one end connected to one end of the secondary winding of the first transformer, and another end connected to the other end of the secondary winding of the first transformer.

[0057] Meanwhile, the electronic device 100 may further include a second rectifier connected to the secondary side winding of the second transformer 130. For example, the second rectifier may include an output capacitor; a fifth diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the second transformer; a sixth diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary side winding of the second transformer; a seventh diode having a cathode connected to one end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor; and an eighth diode having a cathode connected to the other end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor.

[0058] Here, the second rectifier may further include a resonant capacitor provided between a node to which the anode of the sixth diode and the cathode of the eighth diode are connected and the other end of the secondary side winding of the second transformer 130. Therefore, a reverse recovery phenomenon of the diode included in the second rectifier may be prevented, which will be described below with reference to the accompanying drawings.

[0059] The electronic device 100 may further include: a mainboard; a backlight driver; and a backlight. In this case, the first rectifier 120 may provide a first output power to the mainboard, the second rectifier may provide a second output power to the backlight driver or the backlight, and the first output power may be different from the second output power.

[0060] In this way, the electronic device 100 can provide multiple outputs while being slimmer. In addition, the second transformer connected to the secondary side of the first transformer can have fewer turns by increasing the thickness of the core and have smaller leakage inductance by using an interleaved winding method, thereby improving cross-regulation characteristics.

[0061] In the following, the instructions refer to Figures 3 to 8 The operation of the electronic device 100 is described in more detail. Figures 3 to 8 Various embodiments are described. However, reference is made to Figures 3 to 8 The various embodiments described may be implemented in any combination thereof.

[0062] Figure 3 1 is a view for explaining a circuit configuration of the electronic device 100 according to one or more embodiments of the present disclosure.

[0063] like Figure 3 As shown, the electronic device 100 may include a converter 110, which includes a first transformer T1 or 110-1; a first rectifier 120, which is connected to the secondary side winding of the first transformer 110-1; and a second transformer T2 or 130, which has a primary side winding connected to the secondary side winding of the first transformer 110-1 and a node to which a diode included in the first rectifier 120 is connected.

[0064] Here, the first rectifier 120 may be implemented as a center-tapped rectifier. For example, the first rectifier 120 may include an output capacitor Co1 having one end connected to one end of the secondary side first winding of the first transformer 110-1 and one end of the secondary side second winding of the first transformer 110-1; a first diode D1 having a cathode connected to the other end of the secondary side first winding of the first transformer 110-1 and an anode connected to the other end of the output capacitor; and a second diode D2 having a cathode connected to the other end of the secondary side second winding of the first transformer 110-1 and an anode connected to the other end of the output capacitor. In this case, the primary side winding of the second transformer 130 may have one end connected to the cathode of the first diode, and the other end connected to the cathode of the second diode.

[0065] The first transformer 110-1 may provide the mainboard with a first output power delivered through the first rectifier 120. The second transformer 130 may provide the backlight driver or the backlight with a second output power delivered through the second rectifier. Here, the second rectifier may include: an output capacitor Co2; a fifth diode D5 having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the second transformer; a sixth diode D6 having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary side winding of the second transformer; a seventh diode D7 having a cathode connected to one end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor; and an eighth diode D8 having a cathode connected to the other end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor.

[0066] Since the secondary side is implemented as a single winding, the first transformer 110-1 can have a lower height. The second transformer 130 is a transformer provided on the secondary side of the first transformer 110-1, and can be implemented as a basic insulation transformer because the second transformer does not require enhanced insulation. In addition, the second transformer 130 does not require a segmented bobbin, and thus can have an interleaved winding structure in which the primary side winding and the secondary side winding are alternately wound. Therefore, the second transformer 130 can have a smaller leakage inductance, thereby improving the cross-regulation characteristics.

[0067] Figure 4 is a view showing main operation waveforms of the electronic device 100 according to one or more embodiments of the present disclosure.

[0068] like Figure 4 As shown, a voltage VD1 across the first diode D1 and a voltage VD2 across the second diode D2 included in the first rectifier 120 may be complementary to each other based on the switching frequency and have a value between zero and 2Vo1. For example, in the case where the first output power provided to the main board is 13V, VD1 and VD2 may operate between zero and 26V. Therefore, VT2 may operate between -26V and 26V based on the switching frequency.

[0069] When the turns ratio of the second transformer 130 is nT2, the second output power may be Vo2=2×nT2×Vo1. That is, the desired Vo2 may be obtained by adjusting nT2, regardless of Vo1.

[0070] I(D5) and I(D6) may reach zero more slowly than I(D1) and I(D2). In detail, in the case of the first transformer 110-1, Cr, Lr, and secondary-side leakage inductances Llks1 and Llks2 of the first transformer 110-1 may affect resonance. However, in the case of the second transformer 130, only the secondary-side leakage inductance Llksa of the second transformer 130 may affect resonance. Therefore, the resonant frequency may be lower to increase the resonant period, thereby slowing down the speed at which I(D5) and I(D6) reach zero.

[0071] Figure 5 2 is a view for explaining the influence of the leakage inductance of the second transformer 130 according to one or more embodiments of the present disclosure.

[0072] like Figure 5As shown, when the leakage inductance Llksa of the secondary side of the second transformer 130 increases, I(D5) and I(D6) may not reach zero before the primary side switch turns off. Here, when the primary side switch turns off, I(D5) and I(D6) may rapidly decrease, causing a reverse recovery phenomenon in the diodes included in the second rectifier connected to the secondary side of the second transformer 130, which may result in losses.

[0073] To solve this problem, a capacitor Ca can be added in series to the leakage inductance Llksa of the secondary side of the second transformer 130, which can reduce the resonant capacitance and thus increase the resonant frequency. Therefore, I(D5) and I(D6) can reach zero before the primary side switch turns off.

[0074] Figure 6 is a view for explaining the structure of a transformer based on whether a segmented spool is used according to one or more embodiments of the present disclosure.

[0075] Figure 6 The left side of shows a transformer using a segmented spool because the transformer needs enhanced insulation; and Figure 6 the right side of shows a transformer that does not use a segmented spool.

[0076] When the transformer is designed to have the same height, the transformer that does not use a segmented spool can not use any spool structure for insulation between the primary side and the secondary side, and thus has upper and lower layers of the magnetic core designed to be thicker (L1 < L2). Therefore, the area Ae through which the magnetic flux can flow in the transformer core can be increased. The maximum magnetic flux Bmax is inversely proportional to Ae and the number of turns. Therefore, the transformer can be designed to have the same Bmax and fewer turns as Ae increases. In addition, the transformer does not require enhanced insulation and thus can have an interleaved winding structure in which the primary side winding and the secondary winding are alternately wound.

[0077] The second transformer 130 can have fewer turns and an interleaved winding structure, thus having a lower leakage inductance.

[0078] The secondary side leakage inductance can participate in resonance to change the voltage gain of the LLC converter. Therefore, when the secondary side leakage inductance increases, the output voltage can be changed based on the load and input voltage variations.

[0079] In the case where the second transformer 130 ideally has a secondary-side leakage inductance of zero, Vo2=2*nT2*Vo1 can remain constant regardless of the load and input voltage conditions. However, as the secondary-side leakage inductance increases, the cross-regulation characteristics may be very poor, causing Vo2 to vary significantly. In particular, the load on the second transformer 130 may be zero, and the load on the first transformer 110-1 may be large. In this case, Vo2 may be greatly increased to increase the voltage stress of the diode included in the second rectifier, which may require an additional dummy load circuit. The second transformer 130 according to the present disclosure may have a smaller secondary-side leakage inductance, thereby improving the cross-regulation characteristics.

[0080] Figure 7 and Figure 8 1 is a view for explaining the structure of the first rectifier 120 according to one or more embodiments of the present disclosure.

[0081] For ease of description, Figure 3 It is assumed that the first rectifier 120 is a center-tapped rectifier. However, the first rectifier 120 may be implemented as a full-bridge rectifier or a voltage doubler rectifier.

[0082] For example, Figure 7 As shown, the first rectifier 120 may be implemented as a full-bridge rectifier including an output capacitor; a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary winding of the first transformer; a second diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary winding of the first transformer; a third diode having a cathode connected to one end of the secondary winding of the first transformer and an anode connected to the other end of the output capacitor; and a fourth diode having a cathode connected to the other end of the secondary winding of the first transformer and an anode connected to the other end of the output capacitor. In this case, VT2 may operate between -Vo1 and Vo1.

[0083] Alternatively, if Figure 8As shown, the first rectifier 120 may include an output capacitor; a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary winding of the first transformer; a first capacitor having one end connected to one end of the output capacitor and the other end connected to the other end of the secondary winding of the first transformer; a second diode having a cathode connected to one end of the secondary winding of the first transformer and an anode connected to the other end of the output capacitor; and a second capacitor having one end connected to the other end of the secondary winding of the first transformer and the other end connected to the other end of the output capacitor. In this case, VT2 can operate between -0.5Vo1 and 0.5Vo1.

[0084] At the same time, for the convenience of description, Figure 3 , Figure 7 and Figure 8 Assume that the second rectifier is a full-bridge rectifier. However, the present disclosure is not limited thereto. For example, the second rectifier can be implemented as a center-tapped rectifier or a voltage doubler rectifier.

[0085] Fig. 9 is a flowchart illustrating a method of manufacturing an electronic device according to one or more embodiments of the present disclosure.

[0086] First, the method may include forming a converter including a first transformer (S910). In addition, the method may include forming a first rectifier connected to the secondary side winding of the first transformer (S920). The method may include forming a second transformer having a primary side winding connected to a node to which the secondary side winding of the first transformer and a diode included in the first rectifier are connected (S930). Here, the secondary side winding of the first transformer may be a single winding.

[0087] Here, the first transformer may be a reinforced insulation transformer, and the second transformer may be a basic insulation transformer.

[0088] In addition, the second transformer may be a transformer having an interleaved winding structure in which a primary side winding and a secondary side winding thereof are alternately wound.

[0089] At the same time, forming a first rectifier (S920) may include: forming an output capacitor having one end connected to one end of a first winding on the secondary side of a first transformer and one end of a second winding on the secondary side of the first transformer; forming a first diode having a cathode connected to the other end of the first winding on the secondary side of the first transformer and an anode connected to the other end of the output capacitor; and forming a second diode having a cathode connected to the other end of the second winding on the secondary side of the first transformer and an anode connected to the other end of the output capacitor; and when forming a second transformer (S930), the primary side winding of the second transformer may have one end connected to the cathode of the first diode and the other end connected to the cathode of the second diode.

[0090] Alternatively, forming the first rectifier (S920) may include: forming an output capacitor; forming a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the first transformer; forming a second diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary side winding of the first transformer; forming a third diode having a cathode connected to one end of the secondary side winding of the first transformer and an anode connected to the other end of the output capacitor; and forming a fourth diode having a cathode connected to the other end of the secondary side winding of the first transformer and an anode connected to the other end of the output capacitor, and when forming the second transformer (S930), the primary side winding may have one end connected to one end of the secondary side winding of the first transformer, and another end connected to the other end of the secondary side winding of the first transformer.

[0091] Alternatively, forming a first rectifier (S920) may include: forming an output capacitor; forming a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the first transformer; forming a first capacitor having one end connected to one end of the output capacitor and another end connected to the other end of the secondary side winding of the first transformer; forming a second diode having a cathode connected to one end of the secondary side winding of the first transformer and an anode connected to the other end of the output capacitor; and forming a second capacitor having one end connected to the other end of the secondary side winding of the first transformer and another end connected to the other end of the output capacitor, and when forming a second transformer (S930), the primary side winding may have one end connected to one end of the secondary side winding of the first transformer, and the other end connected to the secondary side winding of the first transformer.

[0092] Meanwhile, the method may further include forming a second rectifier connected to the secondary side winding of the second transformer.

[0093] Here, the method may further include forming a mainboard, forming a backlight driver, and forming a backlight. In this case, the first rectifier may provide a first output power to the mainboard, the second rectifier may provide a second output power to the backlight driver or the backlight, and the first output power may be different from the second output power.

[0094] In addition, forming the second rectifier may include: forming an output capacitor; forming a fifth diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the second transformer; a sixth diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary side winding of the second transformer; a seventh diode having a cathode connected to one end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor; and an eighth diode having a cathode connected to the other end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor.

[0095] Here, forming the second rectifier may further include forming a resonant capacitor provided between a node to which the anode of the sixth diode and the cathode of the eighth diode are connected and the other end of the secondary side winding of the second transformer.

[0096] At the same time, the second transformer may have a smaller leakage inductance than the first transformer.

[0097] According to various embodiments of the present disclosure as described above, an electronic device can provide multiple outputs while being slimmer.

[0098] Furthermore, the second transformer connected to the secondary side of the first transformer may have fewer turns by increasing the thickness of the core and smaller leakage inductance by using an interleaved winding method, thereby improving cross-regulation characteristics.

[0099] An embodiment of the present disclosure may provide a method for manufacturing an electronic device, the method comprising: forming a converter, the converter comprising a first transformer; forming a first rectifier connected to a secondary side winding of the first transformer; and forming a second transformer, the second transformer having a primary side winding, the primary side winding being connected to a secondary side winding of the first transformer and a node to which a diode included in the first rectifier is connected, wherein the secondary side winding of the first transformer is a single winding.

[0100] The first transformer may be a reinforced insulation transformer and the second transformer may be a basic insulation transformer.

[0101] The second transformer may be a transformer having an interleaved winding structure in which a primary side winding and a secondary side winding thereof are alternately wound.

[0102] Forming a first rectifier may include forming an output capacitor having one end connected to one end of a first winding on the secondary side of a first transformer and one end of a second winding on the secondary side of the first transformer; forming a first diode having a cathode connected to the other end of the first winding on the secondary side of the first transformer and an anode connected to the other end of the output capacitor; and forming a second diode having a cathode connected to the other end of the second winding on the secondary side of the first transformer and an anode connected to the other end of the output capacitor, and when forming a second transformer, the primary side winding may have one end connected to the cathode of the first diode, and the other end connected to the cathode of the second diode.

[0103] Forming the first rectifier may include forming an output capacitor; forming a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the first transformer; forming a second diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary side winding of the first transformer; forming a third diode having a cathode connected to one end of the secondary side winding of the first transformer and an anode connected to the other end of the output capacitor; and forming a fourth diode having a cathode connected to the other end of the secondary side winding of the first transformer and an anode connected to the other end of the output capacitor, and when forming the second transformer, the primary side winding may have one end connected to one end of the secondary side winding of the first transformer, and the other end connected to the other end of the secondary side winding of the first transformer.

[0104] Forming the first rectifier may include forming an output capacitor; forming a first diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the first transformer; forming a first capacitor having one end connected to one end of the output capacitor and another end connected to the other end of the secondary side winding of the first transformer; forming a second diode having a cathode connected to one end of the secondary side winding of the first transformer and an anode connected to the other end of the output capacitor; and forming a second capacitor having one end connected to the other end of the secondary side winding of the first transformer and another end connected to the other end of the output capacitor, and when forming the second transformer, the primary side winding has one end connected to one end of the secondary side winding of the first transformer, and the other end connected to the secondary side winding of the first transformer.

[0105] The method may further include forming a second rectifier connected to the secondary side winding of the second transformer.

[0106] The method may also include forming a mainboard, forming a backlight driver, and forming a backlight. In this case, the first rectifier may provide a first output power to the mainboard, the second rectifier may provide a second output power to the backlight driver or the backlight, and the first output power may be different from the second output power.

[0107] Forming the second rectifier may include forming an output capacitor; forming a fifth diode having a cathode connected to one end of the output capacitor and an anode connected to one end of the secondary side winding of the second transformer; a sixth diode having a cathode connected to one end of the output capacitor and an anode connected to the other end of the secondary side winding of the second transformer; a seventh diode having a cathode connected to one end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor; and an eighth diode having a cathode connected to the other end of the secondary side winding of the second transformer and an anode connected to the other end of the output capacitor.

[0108] Forming the second rectifier may further include forming a resonant capacitor disposed between a node to which an anode of the sixth diode and a cathode of the eighth diode may be connected and the other end of the secondary side winding of the second transformer.

[0109] The second transformer may have a smaller leakage inductance than the first transformer.

[0110] At the same time, according to one or more embodiments of the present disclosure, the various embodiments described above may be implemented by software including instructions stored in a machine-readable storage medium (e.g., a computer-readable storage medium). A machine may be a device that calls stored instructions from a storage medium, may operate based on the called instructions, and may include an electronic device (e.g., electronic device 100) according to the disclosed embodiments. In the case where the instructions are executed by a processor, the processor may directly execute the functions corresponding to the instructions, or other components may execute the functions corresponding to the instructions under the control of the processor. The instructions may include code provided or executed by a compiler or interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory" indicates that the storage medium is tangible and does not include signals, and does not distinguish whether the data is stored semi-permanently or temporarily in the storage medium.

[0111] In addition, according to one or more embodiments of the present disclosure, the methods according to the various embodiments described above may be included and provided in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disc read-only memory (CD-ROM)) or distributed through an application store (e.g., PlayStore). TM ) Online distribution. In the case of online distribution, at least a part of the computer program product may be at least temporarily stored or temporarily provided in a storage medium, such as a memory of a manufacturer's server, an application store's server, or a relay server.

[0112] In addition, according to one or more embodiments of the present disclosure, the various embodiments described above can be implemented in a computer or a computer-readable recording medium using software, hardware, or a combination of software and hardware. In some cases, the embodiments described in the specification can be implemented by the processor itself. According to software implementation, embodiments such as the processes and functions described in the specification can be implemented by separate software modules. Each of the software modules can perform one or more functions and operations described in the specification.

[0113] Meanwhile, computer instructions for executing the processing operations of the machine according to the various embodiments of the present disclosure described above may be stored in a non-transitory computer-readable medium. Computer instructions stored in a non-transitory computer-readable medium allow a specific machine to perform processing operations in the machine according to the various embodiments described above when the instructions are executed by a processor of the specific machine. A non-transitory computer-readable medium is not a medium (such as a register, cache, or memory) in which data is stored for a period of time, and indicates a medium in which data is semi-permanently stored and can be read by a machine. Specific examples of non-transitory computer-readable media may include a compact disc (CD), a digital versatile disc (DVD), a hard disk, a Blu-ray disc, a universal serial bus (USB), a memory card, a read-only memory (ROM), and the like.

[0114] In addition, each of the components (e.g., modules or programs) according to the various embodiments described above may include a single entity or multiple entities, and some of the corresponding subcomponents described above may be omitted or other subcomponents may be further included in various embodiments. Alternatively or additionally, some components (e.g., modules or programs) may be integrated into one entity, and the functions performed by the corresponding corresponding components may be performed before being integrated in the same or similar manner. The operations performed by the modules, programs or other components according to the various embodiments may be performed in a sequential manner, in a parallel manner, in an iterative manner or in a heuristic manner, and at least some of the operations may be performed in a different order or omitted, or other operations may be added.

[0115] Although the embodiments of the present disclosure have been shown and described above, the present disclosure is not limited to the above specific embodiments, and various modifications may be made by those skilled in the art to which the present disclosure belongs without departing from the scope and spirit of the present disclosure disclosed in the appended claims. These modifications should also be understood to fall within the scope and spirit of the present disclosure.

Claims

1. An electronic device, comprising: A converter, the converter comprising a first transformer, the first transformer comprising a primary side winding and a secondary side winding; a first rectifier connected to the secondary side winding of the first transformer and including a diode; and a second transformer, the second transformer comprising a primary winding and a secondary winding, wherein the secondary winding of the first transformer is a single winding, and The primary side winding of the second transformer is connected to a node to which the secondary side winding of the first transformer and the diode included in the first rectifier are connected.

2. The electronic device according to claim 1, wherein: The first transformer is a reinforced insulation transformer, and The second transformer is a basic insulation transformer.

3. The electronic device according to claim 2, wherein: The second transformer is formed with an interleaved winding structure in which the primary side winding and the secondary side winding of the second transformer are alternately wound.

4. The electronic device according to claim 1, wherein: The first transformer comprises: The first winding on the secondary side, and Secondary side second winding, The diode of the first rectifier includes a first diode and a second diode, The first rectifier comprises: an output capacitor having a first end connected to a first end of the secondary side first winding of the first transformer and a first end of the secondary side second winding of the first transformer, The first diode has a cathode connected to the second end of the secondary side first winding of the first transformer and an anode connected to the second end of the output capacitor, The second diode has a cathode connected to the second end of the secondary side second winding of the first transformer and an anode connected to the second end of the output capacitor, and The primary side winding of the second transformer has a first end connected to the cathode of the first diode, and a second end connected to the cathode of the second diode.

5. The electronic device according to claim 1, wherein: The diodes of the first rectifier include a first diode, a second diode, a third diode and a fourth diode, The first rectifier includes an output capacitor, The first diode has a cathode connected to a first end of the output capacitor and an anode connected to a first end of the secondary side winding of the first transformer, the second diode having a cathode connected to the first end of the output capacitor and an anode connected to the second end of the secondary side winding of the first transformer, the third diode having a cathode connected to the first end of the secondary side winding of the first transformer and an anode connected to the second end of the output capacitor, The fourth diode has a cathode connected to the second end of the secondary side winding of the first transformer and an anode connected to the second end of the output capacitor, and The primary side winding of the second transformer has a first end connected to the first end of the secondary side winding of the first transformer, and a second end connected to the second end of the secondary side winding of the first transformer.

6. The electronic device according to claim 1, wherein: The first rectifier includes a first capacitor, a second capacitor and an output capacitor, The diode of the first rectifier includes a first diode and a second diode, The first diode has a cathode connected to a first end of the output capacitor and an anode connected to a first end of the secondary side winding of the first transformer, The first capacitor has a first end connected to the first end of the output capacitor and a second end connected to the second end of the secondary side winding of the first transformer, the second diode having a cathode connected to the first end of the secondary side winding of the first transformer and an anode connected to the second end of the output capacitor, The second capacitor has a first end connected to the second end of the secondary side winding of the first transformer and a second end connected to the second end of the output capacitor, and The primary side winding of the second transformer has a first end connected to the first end of the secondary side winding of the first transformer, and a second end connected to the second end of the secondary side winding of the first transformer.

7. The electronic device according to claim 1, further comprising: A second rectifier is connected to the secondary side winding of the second transformer.

8. The electronic device according to claim 7, further comprising: Motherboard; Backlight driver; and Backlight, Wherein, the first rectifier provides a first output power to the mainboard, The second rectifier provides a second output power for the backlight driver and / or the backlight, and The first output power is different from the second output power.

9. The electronic device according to claim 7, wherein: The second rectifier comprises: Output capacitor, a first diode having a cathode connected to a first end of the output capacitor and an anode connected to a first end of the secondary side winding of the second transformer, a second diode having a cathode connected to the first end of the output capacitor and an anode connected to a second end of the secondary side winding of the second transformer, a third diode having a cathode connected to the first end of the secondary side winding of the second transformer and an anode connected to a second end of the output capacitor, and A fourth diode has a cathode connected to the second end of the secondary side winding of the second transformer and an anode connected to the second end of the output capacitor.

10. The electronic device according to claim 9, wherein: The second rectifier comprises: A resonant capacitor is provided between a node to which the anode of the second diode and the cathode of the fourth diode are connected and the second end of the secondary side winding of the second transformer.

11. The electronic device according to claim 1, wherein: The second transformer has a smaller leakage inductance than the first transformer.

12. A method for manufacturing an electronic device, the method comprising: forming a converter, the converter comprising a first transformer having a primary side winding and a secondary side winding; forming a first rectifier connected to the secondary side winding of the first transformer and including a diode; and forming a second transformer, the second transformer comprising a primary winding and a secondary winding, wherein the secondary winding of the first transformer is a single winding, and The primary side winding of the second transformer is connected to a node to which the secondary side winding of the first transformer and the diode included in the first rectifier are connected.

13. The method according to claim 12, wherein: The first transformer is a reinforced insulation transformer, and The second transformer is a basic insulation transformer.

14. The method according to claim 13, wherein: The second transformer is formed with an interleaved winding structure in which the primary side winding and the secondary side winding of the second transformer are alternately wound.

15. The method according to claim 12, wherein: forming the first transformer includes forming a secondary-side first winding and a secondary-side second winding, The diode of the first rectifier includes a first diode and a second diode, Forming the first rectifier includes: forming an output capacitor having a first end connected to a first end of the secondary side first winding of the first transformer and a first end of the secondary side second winding of the first transformer, forming the first diode to have a cathode connected to the second end of the secondary side first winding of the first transformer and an anode connected to the second end of the output capacitor, and forming the second diode to have a cathode connected to the second end of the secondary side second winding of the first transformer and an anode connected to the second end of the output capacitor, and When forming the second transformer, the primary side winding of the second transformer is formed to have a first end connected to the cathode of the first diode, and a second end connected to the cathode of the second diode.

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