Voltage transformation circuit, charging circuit, power adapter, power module and electronic equipment

Abstract

The utility model relates to a voltage transformation circuit, a charging circuit, a power adapter, a power module and electronic equipment. The voltage transformation circuit comprises an input end; the voltage transformation module is connected with the input end, the voltage transformation module comprises a switching circuit, and the switching circuit is provided with a plurality of switching elements; one end of the conduction module is connected to the switching circuit, and when the switching circuit is in a disconnection period and the conduction module is conducted, the current of the input end flows through the conduction module to enable the switching element to discharge. According to the invention, the conduction module connected with the switching circuit of the voltage transformation module is arranged, so that the conduction module is conducted when the switching circuit is in the off period, a path is provided for discharging of the switching element, zero-voltage conduction of the voltage transformation conduction assembly is realized, the switching loss is reduced, and the charging efficiency of the charging circuit is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of power charging technology, and in particular to a voltage conversion circuit, a charging circuit, a power adapter, a power module and an electronic device. Background Art

[0002] With the development of fast charging technology, chargers are gradually developing towards high power and miniaturization. In order to achieve the purpose of high power and miniaturization, chargers often use charge pump circuits as voltage conversion circuits.

[0003] Since the voltage change of the charge pump requires the control of multiple switches to be frequently turned on and off, when the switch changes from the on state to the off state, the current and charge cannot be consumed immediately, and the charge or current will be stored. As the reverse bias in the transformer circuit increases, these stored charges and currents will be released and absorb energy inside the transformer circuit, resulting in switching losses. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a voltage conversion circuit, a charging circuit, a power adapter, a power module and an electronic device.

[0005] According to a first aspect of an embodiment of the present disclosure, a transformer circuit is provided, comprising: an input end; a transformer module connected to the input end, the transformer module comprising a switching circuit, the switching circuit being provided with a plurality of switching elements; a conduction module, one end of the conduction module being connected to the switching circuit, wherein when the switching circuit is in an off period and the conduction module is turned on, the current at the input end flows through the conduction module to discharge the switching element.

[0006] In some embodiments, when the switching circuit is in an off period and the conduction module is turned on, the input end charges a portion of the plurality of switching elements, and another portion of the plurality of switching elements is discharged through the conduction module so that the voltage on both sides of the discharged switching elements is zero.

[0007] In some embodiments, the output end, the other end of the conduction module is connected to the output end; the conduction module includes a first conduction element, one end of the first conduction element is connected to the switching circuit, and the first conduction element controls the conduction state of the conduction module.

[0008] In some embodiments, the conduction module includes a first inductor, the first inductor is connected to the first conduction element, and the other end of the first inductor is connected to the output end.

[0009] In some embodiments, the switching elements include a first group of switching elements and a second group of switching elements that are different from each other; the switching circuit has different states in different operating periods, and the operating period includes a first operating period connected to the disconnection period, during which each of the switching elements is disconnected; in the first operating period, the first group of switching elements is disconnected and the second group of switching elements is turned on, wherein, in the disconnection period before the first operating period, the conduction module is in a first state to discharge the second group of switching elements.

[0010] In some embodiments, the period in the first state includes a first conduction period; during the first conduction period, the first conduction element is turned on to discharge the second group of switching elements of the transformation module.

[0011] In some embodiments, the transformer module includes a first transformer module and a second transformer module, the first transformer module includes a first switching circuit, and the second transformer module includes a second switching circuit; one end of the conduction module is connected to the first switching circuit, and the other end of the conduction module is connected to the second switching circuit.

[0012] In some embodiments, the conduction module includes multiple conduction elements; when the switching circuit is in an off period and when the conduction module is in different states, different conduction elements in the conduction module are turned on to discharge the corresponding switching elements of different transformer modules.

[0013] In some embodiments, the conduction module includes a first conduction element, a second conduction element, a third conduction element and a fourth conduction element; the switching circuit of the first transformer module includes a first switch, a second switch and a third switch connected in sequence, and the switching circuit of the second transformer module includes a fifth switch, a sixth switch and a seventh switch connected in sequence; the first conduction element is connected to the third conduction element, and the second conduction element is connected to the fourth conduction element; one end of the first conduction element is connected between the first switch and the second switch; one end of the second conduction element is connected between the fifth switch and the sixth switch; one end of the third conduction element is connected between the second switch and the third switch; one end of the fourth conduction element is connected between the sixth switch and the seventh switch.

[0014] In some embodiments, the conduction module includes a first inductor, the first inductor is connected between the first conduction element and the third conduction element, and the other end of the first inductor is connected between the second conduction element and the fourth conduction element.

[0015] In some embodiments, the first operating period includes a continuous first conduction period and a second conduction period; during the first conduction period, the first conduction element and the fourth conduction element are turned on to discharge the second group of switching elements of the first transformer module; during the second conduction period, the second conduction element and the third conduction element are turned on to discharge the second group of switching elements of the second transformer module.

[0016] In some embodiments, the operating period also includes a second operating period, in which the second group of switching elements is disconnected and the first group of switching elements is turned on, and the first operating period is separated from the second operating period by the disconnection period, wherein in the disconnection period before the second operating period, the conduction module is in a second state to discharge the first group of switching elements.

[0017] In some embodiments, the time period of the second state of the conduction module includes a continuous third conduction period and a fourth conduction period. During the third conduction period, the second conduction element and the third conduction element are turned on to discharge the first group of switching elements of the second transformer module. During the fourth conduction period, the first conduction element and the fourth conduction element are turned on to discharge the first group of switching elements of the first transformer module.

[0018] In some embodiments, the first conductive element, the second conductive element, the third conductive element, and the fourth conductive element are switches or diodes.

[0019] In some embodiments, the voltage transformation circuit includes: a voltage transformation capacitor, including a first voltage transformation capacitor and a second voltage transformation capacitor; the first voltage transformation capacitor is arranged in a first voltage transformation module, and the second voltage transformation capacitor is arranged in the second voltage transformation module.

[0020] In some embodiments, the voltage conversion circuit includes: a voltage stabilizing capacitor, one end of which is grounded, and the other end of which is connected between the voltage conversion module and the output end.

[0021] In some embodiments, the inductance of the first inductor is 150 nanohenry to 250 nanohenry.

[0022] According to a second aspect of an embodiment of the present disclosure, a charging circuit is provided, and the charging circuit includes: the voltage transformation circuit described in any one of the first aspects.

[0023] According to a third aspect of an embodiment of the present disclosure, a power adapter is provided, and the power adapter comprises: the voltage conversion circuit described in any one of the first aspect, or the charging circuit described in the second aspect.

[0024] According to a fourth aspect of an embodiment of the present disclosure, a power supply module is provided, and the power supply module includes: the voltage conversion circuit described in any one of the first aspect, or the charging circuit described in the second aspect.

[0025] According to a fifth aspect of an embodiment of the present disclosure, an electronic device is provided, comprising: a charging module, wherein charging parameters used by the charging module to charge the electronic device match the charging parameters output by the charging circuit described in the second aspect.

[0026] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure sets a conduction module connected to the switching circuit of the transformer module, so that the conduction module is turned on when the switching circuit is in the off period, providing a discharge path for the switching element, thereby achieving zero-voltage turn-on of the transformer conduction component, thereby reducing switching losses and improving the charging efficiency of the charging circuit.

[0027] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0029] Figure 1 is a schematic diagram of a voltage transformation circuit according to an exemplary embodiment.

[0030] Figure 2 is a switching timing diagram of a switching circuit according to an exemplary embodiment.

[0031] Figure 3 is a schematic diagram showing a first switch driving voltage according to an exemplary embodiment.

[0032] Figure 4 is a schematic diagram showing a second switch driving voltage according to an exemplary embodiment.

[0033] Figure 5 is a schematic diagram showing a first switching voltage according to an exemplary embodiment.

[0034] Figure 6 is a schematic diagram showing a second switch driving voltage according to an exemplary embodiment.

[0035] Figure 7 is a schematic diagram showing a second switching voltage according to an exemplary embodiment.

[0036] Figure 8is a schematic diagram showing a second switching current according to an exemplary embodiment.

[0037] Fig. 9 is a schematic diagram of another voltage transformation circuit according to an exemplary embodiment.

[0038] Fig.10 is a switch timing diagram of another switching circuit according to an exemplary embodiment.

[0039] Fig.11 is a schematic diagram of another voltage transformation circuit according to an exemplary embodiment.

[0040] Fig.12 is a switch timing diagram of another switching circuit according to an exemplary embodiment. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0042] In the related art, the transformer circuit can add multiple switches, impedance resonant devices and current resonance detection modules, and adjust the switch conduction during the dead time, detect the current resonance frequency during the impedance resonance, and control the switch frequency to match the current resonance frequency of the impedance resonant device, so that the voltage of the switch when it is turned on corresponds to the zero voltage value of the resonant current, thereby reducing the switching loss.

[0043] However, this method requires an impedance device with a relatively large impedance value, which is not conducive to the miniaturization of the transformer circuit. In addition, the switch conduction state needs to be adjusted multiple times within the dead time, which has strict requirements on the accuracy of the timing control and high implementation cost.

[0044] In order to solve the above technical problems, according to an embodiment of the present disclosure, a transformer circuit, a charging circuit, a power adapter, a power module and an electronic device are provided, wherein the transformer circuit includes: an input end and an output end; a transformer module, wherein the transformer module includes a switching circuit, wherein the switching circuit is arranged between the input end and the output end; and a conduction module, wherein the conduction module is connected to the switching circuit, wherein when the conduction module is turned on, the current at the input end passes through the conduction module to charge the switching circuit.

[0045] The present disclosure provides a conduction module connected to the switching circuit of the transformer module, so that the conduction module is turned on when the switching circuit is in an off period, providing a discharge path for the switching element, thereby achieving zero-voltage switching of the transformer conduction component, thereby reducing switching losses and improving the charging efficiency of the charging circuit.

[0046] It can be understood that the voltage conversion circuit, charging circuit and power adapter involved in the present disclosure can be applicable to charging a device to be charged.

[0047] It is understandable that the device to be charged involved in the present disclosure is a device with a charging power supply. For example, the device to be charged may be a handheld device with a wireless connection function, a vehicle-mounted device, etc. At present, some examples of devices to be charged are: smart phones (Mobile Phone), pocket computers (Pocket Personal Computer, PPC), PDAs, personal digital assistants (Personal Digital Assistant, PDA), laptops, tablet computers, wearable devices, vehicle-mounted devices, or motor vehicles with charging power supplies, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device may also be a vehicle-mounted device. It should be understood that the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the charging device.

[0048] Figure 1 is a schematic diagram of a voltage transformation circuit according to an exemplary embodiment.

[0049] In some embodiments, Figure 1 As shown, the voltage conversion circuit may include: a voltage conversion module, an output terminal Vout, an input terminal Vin and a conduction module.

[0050] The transformer module can be connected to the input terminal Vin, and the transformer module can include a switching circuit. The switching circuit can be arranged between the input terminal Vin and the output terminal Vout. The switching circuit can be provided with a plurality of switching elements. By changing the state of the switching elements, the paths of different transformer circuits can be turned on, thereby changing the voltage of the output terminal Vout.

[0051] One end of the conduction module may be connected to the switching circuit, and the other end of the conduction module may be grounded.

[0052] When the switching circuit is in the off period and the conduction module is turned on, the conduction module can provide a current path for the switching circuit, so that when the switching circuit is in the off period and the conduction module is turned on, the current at the input terminal Vin can flow through the current path provided by the conduction module to discharge the switching element.

[0053] The disconnection period may be the dead time of the transformer circuit. The transformer circuit completes the transformer process by switching multiple switching elements alternately during the transformer process. In order to prevent the multiple switching elements of the transformer circuit from being turned on at the same time during the alternation process due to timing control errors, a disconnection period, i.e., dead time, is provided during the switching alternation process for buffering.

[0054] Exemplarily, when the conduction module is turned on, some switching elements can discharge through the conduction module, thereby changing the voltage distribution inside the switching circuit, thereby achieving zero-voltage turn-on of some switching elements in the switching circuit, reducing the loss when the switch is turned on, and then reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0055] Exemplarily, when the conduction module is turned on, the parasitic capacitor in the switching circuit can be charged, thereby changing the voltage distribution condition of the switch in the switching circuit, so that the switch in the switching circuit can be turned on with zero voltage.

[0056] When the switching element is a metal-oxide semiconductor field effect transistor, the parasitic capacitor may be a drain-source capacitor.

[0057] The present disclosure provides a conduction module connected to the switching circuit of the transformer module, so that the conduction module is turned on when the switching circuit is in the off period, providing a grounding path for the discharge of the switching element, thereby achieving zero-voltage switching of the transformer conduction component and preventing current from being retained in the conduction component, thereby reducing switching losses and improving the charging efficiency of the charging circuit.

[0058] In some embodiments, Figure 1 As shown, the switching circuit of the transformer module may include a plurality of switches.

[0059] Exemplarily, the transformer module may include a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4 connected in sequence.

[0060] When the conduction module is turned on, the input terminal Vin can charge a part of the multiple switches, and the other part of the multiple switches can be discharged through the conduction module, so that the multiple charged switches share the voltage of the input terminal Vin, thereby changing the voltage distribution inside the switching circuit and making the voltage on both sides of the discharged switching element zero.

[0061] The switching element with zero voltage on both sides can achieve zero voltage turn-on when it is turned on. By achieving zero voltage turn-on of some switching elements in the switching circuit, the loss when the switch is turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0062] In some embodiments, Figure 1As shown, the conduction module may include a first conduction element 11, one end of the first conduction element 11 is connected to the output end Vout, and the other end of the first conduction element 11 is connected to the switching circuit. By changing the conduction state of the first conduction element 11, the conduction state of the conduction module can be changed to control whether the conduction module charges the switching circuit.

[0063] When the first conduction element 11 is closed, the conduction module may be in a conduction state, and the conduction module may provide a new current path for the switching circuit, so that the current may be discharged through the conduction module to the switching element of the switching circuit.

[0064] When the first conducting element 11 is disconnected, the conducting module can be in a disconnected state, and the voltage conversion circuit can normally implement operations such as voltage conversion and current conversion through the switching circuit.

[0065] In some embodiments, Figure 1 As shown, the conduction module may include a first inductor L1, one end of the first inductor L1 is connected to the first conduction element 11, and the other end of the first inductor L1 is connected to the output terminal Vout. By controlling the inductance value of the first inductor L1, the charging and discharging speed of the conduction module for charging the switching circuit can be changed to prevent overcharging or undercharging of the parasitic capacitance in the switching circuit.

[0066] In some embodiments, the larger the inductance value of the first inductor L1, the faster the charging speed, and the inductance value of the first inductor L1 can be determined according to the charging speed of the switching circuit. Exemplarily, the inductance value of the first inductor L1 can be configured so that the current of the input terminal Vin can fully charge the drain-source capacitor of the first switch Q1 within the dead time of the transformer circuit, and the first switch Q1 can share the voltage of the input terminal Vin, so that the second switch Q2 can maintain a zero voltage state.

[0067] Exemplarily, the inductance of the first inductor L1 is 150 nanohenry to 250 nanohenry.

[0068] Figure 2 is a switching timing diagram of a switching circuit according to an exemplary embodiment.

[0069] In some embodiments, Figure 1 and Figure 2 As shown, the switching elements may include a first group of switching elements and a second group of switching elements that are different from each other.

[0070] Exemplarily, the first group of switching elements may include a first switch Q1 and a third switch Q3 , and the second group of switching elements may include a second switch Q2 and a fourth switch Q4 .

[0071] The switching circuit has different states in different operation periods, and the operation period may include a first operation period connected to an off period, wherein when the switching circuit is in the off period, all the switching elements are off.

[0072] For example, when the switching circuit is in the off period, the first switch Q1 , the second switch Q2 , the third switch Q3 , and the fourth switch Q4 may all be turned off.

[0073] In the first operation period T1 , the first group of switching elements are turned off, and the second group of switching elements are turned on.

[0074] For example, in the first operation period T1 , the first switch Q1 and the third switch Q3 may be turned off, and the second switch Q2 and the fourth switch Q4 may be turned on.

[0075] In the off period before the first operation period T1 , the conduction module may be in the first state to discharge the second group of switching elements.

[0076] By placing the conduction module in the first state, the second group of switching elements can be discharged through the conduction module, thereby changing the voltage distribution inside the switching circuit and making the voltages on both sides of the switching elements of the second group of switching elements zero.

[0077] The switching elements of the second group of switching elements with zero voltage on both sides can achieve zero voltage turn-on when turned on. By achieving zero voltage turn-on of the switching elements of the second group of switching elements, the loss of the switching elements of the second group of switching elements when turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0078] In some embodiments, Figure 1 and Figure 2 As shown, the first group of switching elements may include a first switch Q1 and a third switch Q3 , and the second group of switching elements may include a second switch Q2 and a fourth switch Q4 .

[0079] The period of the first state includes a first on-period t1.

[0080] The switching circuit has different states in different operation periods, and the operation period may include a first operation period connected to an off period, wherein when the switching circuit is in the off period, all the switching elements are off.

[0081] For example, when the switching circuit is in the off period, the first switch Q1 , the second switch Q2 , the third switch Q3 , and the fourth switch Q4 may all be turned off.

[0082] In the first operation period T1 , the first group of switching elements are turned off, and the second group of switching elements are turned on.

[0083] For example, in the first operation period T1 , the first switch Q1 and the third switch Q3 may be turned off, and the second switch Q2 and the fourth switch Q4 may be turned on.

[0084] When the conduction module is in the first conduction period t1 , the first conduction element 11 may be in a conduction state to discharge the second group of switching elements.

[0085] The charging current flowing through the first switch Q1 and the discharging current flowing through the second switch Q2 can flow to the output end via the first conductive element 11 and the first inductor L1, and the charging current flowing through the third switch Q3 and the discharging current flowing through the fourth switch Q4 can flow to the output end via the first variable capacitor C1, the first conductive element 11 and the first inductor L1.

[0086] As a result, the voltage across the discharged second switch Q2 and the fourth switch Q4 can be zero, and zero voltage switching can be achieved when turned on. The charged first switch Q1 and the third switch Q3 can share the voltage of the input terminal Vin, so that the voltage across the second switch Q2 and the fourth switch Q4 can be kept at zero.

[0087] By placing the conduction module in the first state, the second group of switching elements can be discharged through the conduction module, thereby changing the voltage distribution inside the switching circuit and making the voltages on both sides of the switching elements of the second group of switching elements zero.

[0088] The switching elements of the second group of switching elements with zero voltage on both sides can achieve zero voltage turn-on when turned on. By achieving zero voltage turn-on of the switching elements of the second group of switching elements, the loss of the switching elements of the second group of switching elements when turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0089] Figure 3 is a schematic diagram showing a first switch driving voltage according to an exemplary embodiment. Figure 4 is a schematic diagram showing a second switch driving voltage according to an exemplary embodiment. Figure 5 is a schematic diagram showing a first switching voltage according to an exemplary embodiment. Figure 6 is a schematic diagram showing a second switch driving voltage according to an exemplary embodiment. Figure 7 is a schematic diagram showing a second switching voltage according to an exemplary embodiment. Figure 8 is a schematic diagram showing a second switching current according to an exemplary embodiment.

[0090] like Figure 3-5As shown, the driving voltage of the first switch Q1 is reduced, the first switch Q1 is disconnected, and the parasitic capacitance of the first switch Q1 is charged through the conduction module. Therefore, when the driving voltage of the second switch Q2 rises to the conduction voltage, the voltage of the first switch Q1 has been raised to the input terminal Vin voltage. At this time, the voltage value across the two ends of the second switch Q2 is 0 volts, and the zero voltage turn-on of the second switch Q2 can be achieved.

[0091] like Figure 6-8 As shown, when the current of the second switch Q2 is turned on, the voltage value across the second switch Q2 is 0 volt, so the second switch Q2 is turned on at zero voltage.

[0092] Fig. 9 is a schematic diagram of another voltage transformation circuit according to an exemplary embodiment. Fig.11 is a schematic diagram of another voltage transformation circuit according to an exemplary embodiment.

[0093] In some embodiments, Fig. 9 and Fig.11 As shown, the transformer module may include a first transformer module and a second transformer module. The switch conduction states of the first transformer module and the second transformer module may be complementary.

[0094] Exemplarily, when the first switch Q1 and the third switch Q3 are turned on and the second switch Q2 and the fourth switch Q4 are turned off, the fifth switch Q5 and the seventh switch Q7 may be turned off, and the sixth switch Q6 and the eighth switch Q8 may be turned on.

[0095] When the first switch Q1 and the third switch Q3 are turned off and the second switch Q2 and the fourth switch Q4 are turned on, the fifth switch Q5 and the seventh switch Q7 may be turned on, and the sixth switch Q6 and the eighth switch Q8 may be turned off.

[0096] When the switching circuit is in the off period, the first switch Q1 , the second switch Q2 , the third switch Q3 , the fourth switch Q4 , the fifth switch Q5 , the sixth switch Q6 , the seventh switch Q7 , and the eighth switch Q8 may all be turned off.

[0097] One end of the conduction module can be connected to the first transformer module, and the other end of the conduction module can be connected to the second transformer module.

[0098] Since the conduction module has the first inductor L1 , when the first conduction element 11 is disconnected, charges will remain in the first inductor L1 of the conduction module, which will have an adverse effect on the circuit.

[0099] By configuring the switch conduction states of the first transformer module and the second transformer module to be complementary, and making the current used by the conduction module to charge the switching circuit of the first transformer module opposite to the current used to charge the switching circuit of the second transformer module, the residual charge in the first inductor L1 can be offset, thereby improving the stability of the transformer circuit.

[0100] In some embodiments, Fig. 9 As shown, the conduction module may include multiple conduction elements, and the conduction elements may include a first conduction element 11, a second conduction element 12, a third conduction element 13 and a fourth conduction element 14, wherein the first conduction element 11 may be connected to the third conduction element 13 and the fourth conduction element 14, and the second conduction element 12 may be connected to the third conduction element 13 and the fourth conduction element 14.

[0101] The plurality of transformation modules may include a first transformation module and a second transformation module, and the conduction module may connect the first transformation module and the second transformation module.

[0102] Exemplarily, the first conductive element 11 may be connected between the first switch Q1 and the second switch Q2 of the first transformer module, and the second conductive element 12 may be connected between the fifth switch Q5 and the sixth switch Q6 of the second transformer module.

[0103] When the switching circuit is in the off period and when the conduction module is in different states, different conduction elements in the conduction module are turned on to discharge or charge corresponding switching elements of different transformation modules.

[0104] When the switching circuit is in the off period and the conduction module is in different states, different conduction elements in the conduction module are turned on to discharge or charge corresponding switching elements of different transformer modules, thereby changing the voltage distribution inside the switching circuit and making the voltage on both sides of the corresponding switching element zero. The corresponding switching element may be a switching element that is about to be turned on in the timing control of the switching element.

[0105] The switching elements of the second group of switching elements with zero voltage on both sides can achieve zero voltage turn-on when turned on. By achieving zero voltage turn-on of the switching elements of the second group of switching elements, the loss of the switching elements of the second group of switching elements when turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0106] In some embodiments, Fig. 9 As shown, the conduction module may include a first conduction element 11 , a second conduction element 12 , a third conduction element 13 , and a fourth conduction element 14 .

[0107] The first conductive element 11 is connected to the third conductive element 13, and the first conductive element 11 is connected to the series point of the first switch Q1 and the second switch Q2 of the first transformation module, and the third conductive element 13 is connected to the series point of the second switch Q2 and the third switch Q3 of the first transformation module. The second conductive element 12 is connected to the fourth conductive element 14, and the second conductive element 12 is connected to the series point of the fifth switch Q5 and the sixth switch Q6 of the second transformation module, and the fourth conductive element 14 is connected to the series point of the sixth switch Q6 and the seventh switch Q7 of the second transformation module.

[0108] The third conductive element 13 and the fourth conductive element 14 are also connected to the output terminal Vout.

[0109] One end of the first inductor L1 is connected to a series connection point of the first conductive element 11 and the third conductive element 13 , and the other end of the first inductor L1 is connected to a series connection point of the second conductive element 12 and the fourth conductive element 14 .

[0110] The switching circuit of the first transformer module includes a first switch Q1, a second switch Q2 and a third switch Q3 connected in sequence, and the switching circuit of the second transformer module includes a fifth switch Q5, a sixth switch Q6 and a seventh switch Q7 connected in sequence.

[0111] The first conductive element 11 is connected to the third conductive element 13, and the second conductive element 12 is connected to the fourth conductive element 14; one end of the first conductive element 11 is connected between the first switch Q1 and the second switch Q2, one end of the second conductive element 12 is connected between the fifth switch Q5 and the sixth switch Q6, one end of the third conductive element 13 is connected between the second switch Q2 and the third switch Q3, and one end of the fourth conductive element 14 is connected between the sixth switch Q6 and the seventh switch Q7.

[0112] Fig.10 is a switch timing diagram of another switching circuit according to an exemplary embodiment.

[0113] In some embodiments, Fig.10 As shown, the period in the first state may include a consecutive first on period t1 and a second on period t2.

[0114] During the first conduction period t1 , the first conduction element 11 and the fourth conduction element 14 may be turned on to discharge the second group of switching elements of the first transformation module.

[0115] Exemplarily, during the first conduction period t1, the first conduction element 11 and the fourth conduction element 14 can be turned on, and the second switch Q2 and the fourth switch Q4 can be discharged through the first conduction element 11 and the fourth conduction element 14, so that the voltage across the second switch Q2 and the fourth switch Q4 can be zero, so that when the transformer circuit enters the first operation period T1 from the disconnection period, the second switch Q2 and the fourth switch Q4 can achieve zero voltage turn-on. By achieving zero voltage turn-on of the second switch Q2 and the fourth switch Q4, the loss when the second switch Q2 and the fourth switch Q4 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0116] During the second conduction period t2 , the second conduction element 12 and the third conduction element 13 may be turned on to discharge the second group of switching elements of the second transformation module.

[0117] Exemplarily, during the second conduction period t2, the second conduction element 12 and the third conduction element 13 can be turned on, and the fifth switch Q5 and the seventh switch Q7 can be discharged through the second conduction element 12 and the third conduction element 13, so that the voltage across the fifth switch Q5 and the seventh switch Q7 can be zero, so that when the transformer circuit enters the first operation period T1 from the disconnection period, the fifth switch Q5 and the seventh switch Q7 can achieve zero voltage turn-on. By achieving zero voltage turn-on of the fifth switch Q5 and the seventh switch Q7, the loss of the fifth switch Q5 and the seventh switch Q7 when they are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0118] In some embodiments, Fig.10 As shown, the operation period may further include a second operation period T2 , in which the second group of switching elements are turned off and the first group of switching elements are turned on.

[0119] Exemplarily, in the second operation period T2 , the first switch Q1 , the third switch Q3 , the sixth switch Q6 , and the eighth switch Q8 may be turned on, and the second switch Q2 , the fourth switch Q4 , the fifth switch Q5 , and the seventh switch Q7 may be turned off.

[0120] In the off period before the second operation period T2 , the conduction module may be in the second state to discharge the first group of switching elements.

[0121] By placing the conduction module in the second state, the first group of switching elements can be discharged through the conduction module, thereby changing the voltage distribution inside the switching circuit and making the voltages on both sides of the switching elements of the first group of switching elements zero.

[0122] The switching elements of the first group of switching elements with zero voltage on both sides can achieve zero voltage turn-on when turned on. By achieving zero voltage turn-on of the switching elements of the first group of switching elements, the loss of the switching elements of the first group of switching elements when turned on can be reduced, thereby reducing the power loss of the voltage conversion circuit and improving the charging efficiency of the charging circuit.

[0123] In some embodiments, Fig.10 As shown, the period of the second state of the conducting module may include a third conducting period and a fourth conducting period consecutively.

[0124] During the third conduction period, the second conduction element and the third conduction element are turned on to discharge the first group of switching elements of the second transformation module.

[0125] During the fourth conduction period, the first conduction element and the fourth conduction element are turned on to discharge the first group of switching elements of the first transformation module.

[0126] The period in the second state may include consecutive third and fourth conduction periods t3 and t4.

[0127] During the third conduction period t3 , the second conduction element 12 and the third conduction element 13 may be turned on to discharge the first group of switching elements of the second transformation module.

[0128] Exemplarily, during the third conduction period t3, the second conduction element 12 and the third conduction element 13 can be turned on, and the sixth switch Q6 and the eighth switch Q8 can be discharged through the second conduction element 12 and the third conduction element 13, so that the voltage across the sixth switch Q6 and the eighth switch Q8 can be zero, so that when the transformer circuit enters the second operation period T2 from the disconnection period, the sixth switch Q6 and the eighth switch Q8 can achieve zero voltage turn-on. By achieving zero voltage turn-on of the sixth switch Q6 and the eighth switch Q8, the loss when the sixth switch Q6 and the eighth switch Q8 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0129] During the fourth conduction period t4 , the first conduction element 11 and the fourth conduction element 14 may be turned on to discharge the first group of switching elements of the first transformation module.

[0130] Exemplarily, in the fourth conduction period t4, the first conduction element 11 and the fourth conduction element 14 can be turned on, and the first switch Q1 and the third switch Q3 can be discharged through the first conduction element 11 and the fourth conduction element 14, so that the voltage across the first switch Q1 and the third switch Q3 can be zero, so that when the transformer circuit enters the second operation period T2 from the disconnection period, the first switch Q1 and the third switch Q3 can achieve zero voltage turn-on. By achieving zero voltage turn-on of the first switch Q1 and the third switch Q3, the loss when the first switch Q1 and the third switch Q3 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0131] In some embodiments, Fig. 9 As shown, the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 are switches.

[0132] Exemplarily, the first conduction element 11 , the second conduction element 12 , the third conduction element 13 and the fourth conduction element 14 may be metal-oxide semiconductor field effect transistors.

[0133] By setting the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 as switches, the conductive module can have more switch state combinations to provide more conductive states, so that more switching elements can achieve zero voltage switching through the conductive module.

[0134] In some embodiments, Fig. 9 and 10 As shown, the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 are switches.

[0135] When the transformer circuit is in the first operation period T1, the first switch Q1, the third switch Q3, the sixth switch Q6 and the eighth switch Q8 can be disconnected, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the seventh switch Q7 can be turned on, and the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 can be disconnected.

[0136] When the transformer circuit is in the second operation period T2, the first switch Q1, the third switch Q3, the sixth switch Q6 and the eighth switch Q8 can be turned on, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the seventh switch Q7 can be turned off, and the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 can be turned off.

[0137] In the off period before the first operation period T1 , the conduction module may be in a first state, and the first state may include a consecutive first conduction period t1 and a second conduction period t2 .

[0138] During the first conduction period t1 , the first conduction element 11 and the fourth conduction element 14 may be turned on, and the second conduction element 12 and the third conduction element 13 may be turned off, so that the second switch Q2 and the fourth switch Q4 are discharged, and the first switch Q1 and the third switch Q3 are charged.

[0139] The charging current flowing through the first switch Q1 and the discharging current flowing through the second switch Q2 may flow into the second transformation module through the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0140] The charging current flowing through the third switch Q3 and the discharging current flowing through the fourth switch Q4 may flow into the second transformation module through the first transformation capacitor C1 , the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0141] After charging, the first switch Q1 and the third switch Q3 can share the voltage of the input terminal Vin, and the voltage across the second switch Q2 and the fourth switch Q4 can become zero after discharging, so that when the transformer circuit enters the first operation period T1 from the disconnection period, the second switch Q2 and the fourth switch Q4 can achieve zero voltage turn-on.

[0142] By realizing zero voltage turn-on of the second switch Q2 and the fourth switch Q4, the loss when the second switch Q2 and the fourth switch Q4 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0143] During the second conduction period t2, the first conduction element 11 and the fourth conduction element 14 may be turned off, and the second conduction element 12 and the third conduction element 13 may be turned on, so that the fifth switch Q5 and the seventh switch Q7 are discharged, and the sixth switch Q6 and the eighth switch Q8 are charged.

[0144] The current may flow into the second group of switching units via the third conductive element 13 , the first inductor L1 , and the second conductive element 12 , and flow through the fifth switch Q5 to discharge the fifth switch Q5 , and flow through the sixth switch Q6 to charge the sixth switch Q6 .

[0145] The current can also continue to flow through the second variable capacitor C1 ′, through the seventh switch Q7 and the eighth switch Q8 , to discharge the seventh switch Q7 and charge the eighth switch Q8 .

[0146] After charging, the sixth switch Q6 and the eighth switch Q8 can share the voltage of the input terminal Vin, and the voltage across the fifth switch Q5 and the seventh switch Q7 can become zero after discharging, so that when the transformer circuit enters the first operation period T1 from the disconnection period, the fifth switch Q5 and the seventh switch Q7 can achieve zero voltage turn-on.

[0147] By realizing zero voltage turn-on of the fifth switch Q5 and the seventh switch Q7, the loss when the fifth switch Q5 and the seventh switch Q7 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0148] In the off period before the second operation period T2 , the conduction module may be in the second state, and the second state may include consecutive third conduction period t3 and fourth conduction period t4 .

[0149] During the third conduction period t3, the first conduction element 11 and the fourth conduction element 14 may be turned off, and the second conduction element 12 and the third conduction element 13 may be turned on, so that the fifth switch Q5 and the seventh switch Q7 are charged, and the sixth switch Q6 and the eighth switch Q8 are discharged.

[0150] The current may flow into the second group of switching units via the third conductive element 13 , the first inductor L1 , and the second conductive element 12 , and flow through the fifth switch Q5 to charge the fifth switch Q5 , and flow through the sixth switch Q6 to discharge the sixth switch Q6 .

[0151] The current can also continue to flow through the second variable capacitor C1 ′, through the seventh switch Q7 and the eighth switch Q8 , to charge the seventh switch Q7 and discharge the eighth switch Q8 .

[0152] The charged fifth switch Q5 and the seventh switch Q7 can share the voltage of the input terminal Vin, and the voltage across the sixth switch Q6 and the eighth switch Q8 can become zero after discharge, so that when the transformer circuit enters the second operation period T2 from the disconnection period, the sixth switch Q6 and the eighth switch Q8 can achieve zero voltage turn-on.

[0153] By realizing zero voltage turn-on of the sixth switch Q6 and the eighth switch Q8, the loss when the sixth switch Q6 and the eighth switch Q8 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0154] In the fourth conduction period t4, the first conduction element 11 and the fourth conduction element 14 may be turned on, and the second conduction element 12 and the third conduction element 13 may be turned off, so that the second switch Q2 and the fourth switch Q4 are charged, and the first switch Q1 and the third switch Q3 are discharged.

[0155] The discharge current flowing through the first switch Q1 and the charge current flowing through the second switch Q2 may flow into the second transformation module through the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0156] The discharge current flowing through the third switch Q3 and the charge current flowing through the fourth switch Q4 may flow into the second transformation module through the first transformation capacitor C1 , the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0157] After being charged, the second switch Q2 and the fourth switch Q4 can share the voltage of the input terminal Vin, and the voltage across the first switch Q1 and the third switch Q3 can become zero after being discharged, so that when the transformer circuit enters the second operation period T2 from the disconnection period, the first switch Q1 and the third switch Q3 can achieve zero voltage turn-on.

[0158] By realizing zero voltage turn-on of the first switch Q1 and the third switch Q3, the loss when the first switch Q1 and the third switch Q3 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0159] In some embodiments, the conductive element may be a switch or a diode.

[0160] Exemplarily, the first conduction element 11 , the second conduction element 12 , the third conduction element 13 and the fourth conduction element 14 may be metal-oxide semiconductor field effect transistors.

[0161] By setting the conduction element as a switch, the conduction module can have more switch state combinations to provide more conduction states, so that more switching elements can achieve zero voltage switching through the conduction module.

[0162] Configuring the conduction element as a diode can reduce the production cost of the conduction module, and since the diode does not require timing control, the difficulty of designing the timing control signal for controlling the conduction module can be reduced.

[0163] Fig.12 is a switch timing diagram of another switching circuit according to an exemplary embodiment.

[0164] In some embodiments, Fig.11 and Fig.12 As shown, the third conductive element 13 and the fourth conductive element 14 may be grounded.

[0165] The first conductive element 11 , the second conductive element 12 , the third conductive element 13 and the fourth conductive element 14 are switches.

[0166] Exemplarily, the first conduction element 11 , the second conduction element 12 , the third conduction element 13 and the fourth conduction element 14 may be metal-oxide semiconductor field effect transistors.

[0167] By setting the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 as switches, the conductive module can have more switch state combinations to provide more conductive states, so that more switching elements can achieve zero voltage switching through the conductive module.

[0168] In some embodiments, Figure 2 and 4 As shown, the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 are switches.

[0169] When the transformer circuit is in the first operation period T1, the first switch Q1, the third switch Q3, the sixth switch Q6 and the eighth switch Q8 can be disconnected, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the seventh switch Q7 can be turned on, and the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 can be disconnected.

[0170] When the transformer circuit is in the second operation period T2, the first switch Q1, the third switch Q3, the sixth switch Q6 and the eighth switch Q8 can be turned on, the second switch Q2, the fourth switch Q4, the fifth switch Q5 and the seventh switch Q7 can be turned off, and the first conductive element 11, the second conductive element 12, the third conductive element 13 and the fourth conductive element 14 can be turned off.

[0171] In the off period before the first operation period T1 , the conduction module may be in a first state, and the first state may include a consecutive first conduction period t1 and a second conduction period t2 .

[0172] During the first conduction period t1 , the first conduction element 11 and the fourth conduction element 14 may be turned on, and the second conduction element 12 and the third conduction element 13 may be turned off, so that the second switch Q2 and the fourth switch Q4 are discharged, and the first switch Q1 and the third switch Q3 are charged.

[0173] The charging current flowing through the first switch Q1 and the discharging current flowing through the second switch Q2 may flow into the ground terminal through the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0174] The charging current flowing through the third switch Q3 and the discharging current flowing through the fourth switch Q4 may flow into the ground through the first variable capacitor C1 , the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0175] After charging, the first switch Q1 and the third switch Q3 can share the voltage of the input terminal Vin, and the voltage across the second switch Q2 and the fourth switch Q4 can become zero after discharging, so that when the transformer circuit enters the first operation period T1 from the disconnection period, the second switch Q2 and the fourth switch Q4 can achieve zero voltage turn-on.

[0176] By realizing zero voltage turn-on of the second switch Q2 and the fourth switch Q4, the loss when the second switch Q2 and the fourth switch Q4 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0177] During the second conduction period t2, the first conduction element 11 and the fourth conduction element 14 may be turned off, and the second conduction element 12 and the third conduction element 13 may be turned on, so that the fifth switch Q5 and the seventh switch Q7 are discharged, and the sixth switch Q6 and the eighth switch Q8 are charged.

[0178] The current may flow into the second group of switching units via the third conductive element 13 , the first inductor L1 , and the second conductive element 12 , and flow through the fifth switch Q5 to discharge the fifth switch Q5 , and flow through the sixth switch Q6 to charge the sixth switch Q6 .

[0179] The current can also continue to flow through the second variable capacitor C1 ′, through the seventh switch Q7 and the eighth switch Q8 , to discharge the seventh switch Q7 and charge the eighth switch Q8 .

[0180] After charging, the sixth switch Q6 and the eighth switch Q8 can share the voltage of the input terminal Vin, and the voltage across the fifth switch Q5 and the seventh switch Q7 can become zero after discharging, so that when the transformer circuit enters the first operation period T1 from the disconnection period, the fifth switch Q5 and the seventh switch Q7 can achieve zero voltage turn-on.

[0181] By realizing zero voltage turn-on of the fifth switch Q5 and the seventh switch Q7, the loss when the fifth switch Q5 and the seventh switch Q7 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0182] In the off period before the second operation period T2 , the conduction module may be in the second state, and the second state may include consecutive third conduction period t3 and fourth conduction period t4 .

[0183] During the third conduction period t3, the first conduction element 11 and the fourth conduction element 14 may be turned off, and the second conduction element 12 and the third conduction element 13 may be turned on, so that the fifth switch Q5 and the seventh switch Q7 are charged, and the sixth switch Q6 and the eighth switch Q8 are discharged.

[0184] The current may flow into the second group of switching units via the third conductive element 13 , the first inductor L1 , and the second conductive element 12 , and flow through the fifth switch Q5 to charge the fifth switch Q5 , and flow through the sixth switch Q6 to discharge the sixth switch Q6 .

[0185] The current can also continue to flow through the second variable capacitor C1 ′, through the seventh switch Q7 and the eighth switch Q8 , to charge the seventh switch Q7 and discharge the eighth switch Q8 .

[0186] After charging, the fifth switch Q5 and the seventh switch Q7 can share the voltage of the input terminal Vin, and the voltage across the sixth switch Q6 and the eighth switch Q8 can become zero after discharging, so that when the transformer circuit enters the second operation period T2 from the disconnection period, the sixth switch Q6 and the eighth switch Q8 can achieve zero voltage turn-on.

[0187] By realizing zero voltage turn-on of the sixth switch Q6 and the eighth switch Q8, the loss when the sixth switch Q6 and the eighth switch Q8 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0188] In the fourth conduction period t4, the first conduction element 11 and the fourth conduction element 14 may be turned on, and the second conduction element 12 and the third conduction element 13 may be turned off, so that the second switch Q2 and the fourth switch Q4 are charged, and the first switch Q1 and the third switch Q3 are discharged.

[0189] The discharge current flowing through the first switch Q1 and the charge current flowing through the second switch Q2 may flow into the ground through the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0190] The discharge current flowing through the third switch Q3 and the charge current flowing through the fourth switch Q4 may flow into the ground through the first variable capacitor C1 , the first conductive element 11 , the first inductor L1 and the fourth conductive element 14 .

[0191] After being charged, the second switch Q2 and the fourth switch Q4 can share the voltage of the input terminal Vin, and the voltage across the first switch Q1 and the third switch Q3 can become zero after being discharged, so that when the transformer circuit enters the second operation period T2 from the disconnection period, the first switch Q1 and the third switch Q3 can achieve zero voltage turn-on.

[0192] By realizing zero voltage turn-on of the first switch Q1 and the third switch Q3, the loss when the first switch Q1 and the third switch Q3 are turned on can be reduced, thereby reducing the power loss of the transformer circuit and improving the charging efficiency of the charging circuit.

[0193] In some embodiments, the voltage conversion circuit may include a voltage stabilizing capacitor C2, one end of which is grounded, and the other end of which is connected to the series connection point between the voltage conversion module and the output terminal Vout. The voltage stabilizing capacitor C2 may be used to stabilize the output voltage of the output terminal Vout of the voltage conversion circuit.

[0194] Based on the same concept, an embodiment of the present disclosure also provides a charging circuit.

[0195] In some embodiments, the charging circuit may include a voltage conversion circuit to change the voltage of the power supply to the charging voltage required by the device to be charged.

[0196] Based on the same concept, the embodiment of the present disclosure also provides a power adapter. The power adapter can be a device used to convert external power to meet the charging parameter requirements of the device to be charged.

[0197] The device to be charged may be a laptop computer, a desktop computer, a mobile phone, a digital broadcast terminal, a message transceiver, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, a translation machine, a watch, a bracelet, and a motor vehicle with a charging power source, etc. It may be any device to be charged with a charging power source. In the following description, a mobile phone is used as an example, but the present disclosure is not limited thereto.

[0198] In some embodiments, the power adapter may include a charging circuit, and the power adapter may convert the current and voltage of the external power supply into the current and voltage that meet the charging parameter requirements of the device to be charged. For example, the power adapter may convert 220V AC into 5V-28V DC.

[0199] In some embodiments, the power adapter may include only a voltage conversion circuit.

[0200] Based on the same concept, the embodiment of the present disclosure also provides a power supply module. The power supply module can be a device that converts other forms of energy into electrical energy and provides electrical energy.

[0201] The power module may be a mobile power source, a rechargeable battery built into an electronic device, a storage battery, a fixed charging pile, etc., and may be a device with a charging function. In the following description, a mobile power source is used as an example, but the present disclosure is not limited thereto.

[0202] In some embodiments, the power module may include a charging circuit, and the power module may convert the current and voltage of the external power source into the current and voltage that meet the charging parameter requirements of the power module. Exemplarily, the power module may convert 220V AC into 5V-28V DC.

[0203] In some embodiments, the power module may only include a voltage conversion circuit.

[0204] Based on the same concept, an embodiment of the present disclosure also provides an electronic device.

[0205] The electronic device may be a laptop computer, a desktop computer, a mobile phone, a digital broadcast terminal, a message transceiver device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, a translation machine, a watch, a bracelet, and a motor vehicle with a rechargeable power source, etc., and may be any electronic device with a rechargeable power source. In the following description, a mobile phone is used as an example for description, but the present disclosure is not limited thereto.

[0206] In some embodiments, the electronic device may include a charging module, and the charging circuit may charge the electronic device through the charging module. Exemplarily, the charging module may be a combination of a charging port of the electronic device and a charging-related circuit component.

[0207] The charging parameters of the electronic device provided by the charging module can match the charging parameters output by the charging circuit, so that the charging module can carry the current and voltage output by the charging circuit to achieve fast charging of the electronic device.

[0208] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0209] It is further understood that the terms "second", "secondary", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other and do not indicate a specific order or degree of importance. In fact, the expressions "secondary", "secondary", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the second information may also be referred to as the second information, and similarly, the second information may also be referred to as the second information.

[0210] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0211] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

[0212] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0213] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are considered to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0214] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A voltage conversion circuit, characterized in that: The voltage conversion circuit comprises: Input terminal; A voltage transformation module connected to the input end, wherein the voltage transformation module comprises a switching circuit, and the switching circuit is provided with a plurality of switching elements; A conduction module, one end of which is connected to the switching circuit, Wherein, when the switching circuit is in the off period and the conduction module is turned on, the current at the input end flows through the conduction module to discharge the switching element.

2. The voltage conversion circuit according to claim 1, characterized in that: When the switching circuit is in an off period and the conduction module is turned on, the input end charges a portion of the switching elements, and another portion of the switching elements is discharged through the conduction module to make the voltages on both sides of the discharged switching elements zero.

3. The voltage conversion circuit according to claim 1, characterized in that: The voltage conversion circuit comprises an output end, and the other end of the conduction module is connected to the output end; The conduction module includes a first conduction element, one end of which is connected to the switching circuit, and the first conduction element controls the conduction state of the conduction module.

4. The voltage conversion circuit according to claim 3, characterized in that: The conduction module includes a first inductor, the first inductor is connected to the first conduction element, and the other end of the first inductor is connected to the output end.

5. The voltage conversion circuit according to claim 3, characterized in that: The switching elements include a first group of switching elements and a second group of switching elements that are different from each other; The switching circuit has different states in different operation periods, the operation period including a first operation period connected to the disconnection period, in which each of the switching elements is disconnected; In the first operation period, the first group of switching elements is turned off, and the second group of switching elements is turned on, In the disconnection period before the first operation period, the conduction module is in a first state to discharge the second group of switching elements.

6. The voltage conversion circuit according to claim 5, characterized in that: The period in the first state includes a first on period; During the first conduction period, the first conduction element is turned on to discharge the second group of switching elements of the transformation module.

7. The voltage conversion circuit according to claim 5, characterized in that: The transformer module includes a first transformer module and a second transformer module, the first transformer module includes a first switching circuit, and the second transformer module includes a second switching circuit; One end of the conduction module is connected to the first switching circuit, and the other end of the conduction module is connected to the second switching circuit.

8. The voltage conversion circuit according to claim 7, characterized in that: The conduction module includes a plurality of conduction elements; When the switching circuit is in the off period and when the conduction module is in different states, different conduction elements in the conduction module are turned on to discharge the corresponding switching elements of different transformation modules.

9. The voltage conversion circuit according to claim 8, characterized in that: The conduction module includes a first conduction element, a second conduction element, a third conduction element and a fourth conduction element; The switching circuit of the first transformer module includes a first switch, a second switch and a third switch connected in sequence, and the switching circuit of the second transformer module includes a fifth switch, a sixth switch and a seventh switch connected in sequence; The first conductive element is connected to the third conductive element, and the second conductive element is connected to the fourth conductive element; One end of the first conductive element is connected between the first switch and the second switch; One end of the second conductive element is connected between the fifth switch and the sixth switch; One end of the third conductive element is connected between the second switch and the third switch; One end of the fourth conductive element is connected between the sixth switch and the seventh switch.

10. The voltage conversion circuit according to claim 9, characterized in that: The conduction module includes a first inductor, wherein the first inductor is connected between the first conduction element and the third conduction element, and the other end of the first inductor is connected between the second conduction element and the fourth conduction element.

11. The voltage conversion circuit according to claim 9, characterized in that: The first operation period includes a first conduction period and a second conduction period that are consecutive; During the first conduction period, the first conduction element and the fourth conduction element are turned on to discharge the second group of switching elements of the first transformation module; During the second conduction period, the second conduction element and the third conduction element are turned on to discharge the second group of switching elements of the second transformation module.

12. The voltage conversion circuit according to claim 9, characterized in that: The operation period further includes a second operation period, in which the second group of switching elements is turned off and the first group of switching elements is turned on, and the first operation period and the second operation period are separated by the off period. In the disconnection period before the second operation period, the conduction module is in a second state to discharge the first group of switching elements.

13. The voltage conversion circuit according to claim 12, characterized in that: The period of the second state of the conduction module includes a third conduction period and a fourth conduction period that are consecutive, During the third conduction period, the second conduction element and the third conduction element are turned on to discharge the first group of switching elements of the second transformation module. During the fourth conduction period, the first conduction element and the fourth conduction element are turned on to discharge the first group of switching elements of the first transformation module.

14. The voltage conversion circuit according to claim 9, characterized in that: The first conductive element, the second conductive element, the third conductive element and the fourth conductive element are switches or diodes.

15. The voltage conversion circuit according to claim 7, characterized in that: include: A voltage-changing capacitor, comprising a first voltage-changing capacitor and a second voltage-changing capacitor; The first transformer capacitor is arranged in the first transformer module, and the second transformer capacitor is arranged in the second transformer module.

16. The voltage conversion circuit according to claim 5, characterized in that: include: A voltage stabilizing capacitor, one end of which is grounded, and the other end of which is connected between the voltage transformation module and the output end.

17. The voltage conversion circuit according to claim 4, characterized in that: The inductance of the first inductor is 150 nanohenries to 250 nanohenries.

18. A charging circuit, characterized in that: include: A voltage conversion circuit as claimed in any one of claims 1 to 17.

19. A power adapter, characterized in that: include: The voltage conversion circuit according to any one of claims 1 to 17, or A charging circuit as claimed in claim 18.

20. A power module, characterized in that: include: A voltage transformer circuit as claimed in any one of claims 1 to 17, or A charging circuit as claimed in claim 18.

21. An electronic device, characterized in that: include: A charging module, wherein the charging parameters used by the charging module to charge the electronic device match the charging parameters output by the charging circuit as claimed in claim 18.

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