Voltage transformation circuit, charging circuit, power adapter, power module and electronic equipment
By using multiple resonant transformer modules to alternately input current into the voltage double rectifier module in mobile phone chargers, the problem that existing chargers cannot meet the needs of high power and high frequency is solved, and a wider voltage output range and higher output power are achieved.
Patent Information
- Application Number
- CN202311596703.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-27
- Publication Date
- 2025-05-27
AI Technical Summary
The flyback converter architecture of existing mobile phone chargers cannot meet the needs of high power and high frequency, especially in terms of the wide output range that meets the requirements of fast charging technology and port standards.
Multiple resonant transformer modules are used to input currents alternately into the voltage double-voltage rectifier module, so that the voltage double-voltage rectifier module exponentially amplifies the output range of the resonant transformer module, thereby expanding the voltage output range of the transformer circuit.
It realizes that the voltage range that can be output by the transformer circuit can meet the needs of a wide range of output, improves the output power and efficiency of the power adapter, and supports a wider charging voltage range.
Smart Images
Figure CN120049740A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of power charging, and particularly 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, mobile phone chargers are gradually developing towards high power and miniaturization. To achieve the purpose of high power and miniaturization, it is necessary to improve the power density of the charger through high frequency and high efficiency. However, the current mature flyback converter architecture of mobile phone chargers cannot meet the requirements of high power and high frequency. Therefore, the introduction of new technologies is needed.
[0003] Among the new technologies, the inductor-inductor-capacitor (LLC) architecture technology is relatively mature and is widely used in power supplies from hundreds of watts to several kilowatts. However, due to the influence of its circuit architecture and frequency modulation control, the LLC architecture has a small gain range and cannot meet the wide output range requirements of existing fast charging technology requirements and port standard requirements. Summary of the Invention
[0004] 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 the first aspect of the embodiments of the present disclosure, a voltage conversion circuit is provided. The voltage conversion circuit includes: a voltage conversion input source and a voltage conversion output source; a plurality of resonant voltage conversion modules, each of the resonant voltage conversion modules including a primary end and a secondary end, the primary end being electrically connected to the voltage conversion input source, and the secondary end being electrically connected to the voltage conversion output source; a voltage multiplier rectification module connected between the secondary end and the voltage conversion output source, wherein the plurality of resonant voltage conversion modules alternately input current to the voltage multiplier rectification module.
[0006] In some embodiments, a flying capacitor is provided within the voltage multiplier rectification module, and the number of the flying capacitors is N - 1, where N is the number of the resonant voltage conversion modules.
[0007] In some embodiments, the voltage conversion circuit includes: a first flying capacitor provided within the voltage multiplier rectification module, wherein the voltage conversion circuit includes a first state and a second state; when the voltage conversion circuit is in the first state, the first flying capacitor is charged; when the voltage conversion circuit is in the second state, the first flying capacitor discharges and outputs current to the voltage conversion output source.
[0008] In some embodiments, the resonant voltage transformation module includes: a first resonant voltage transformation module, which includes a first primary end and a first secondary end, the first primary end is electrically connected to the voltage transformation input source, and the first secondary end is electrically connected to the voltage transformation output source; a second resonant voltage transformation module, which includes a second primary end and a second secondary end, the second primary end is electrically connected to the voltage transformation input source, and the second secondary end is electrically connected to the voltage transformation output source. Wherein, when the voltage transformation circuit is in the first state, the voltage transformation input source outputs current to the voltage doubling rectification module through the first resonant voltage transformation module; when the voltage transformation circuit is in the second state, the voltage transformation input source outputs current to the voltage doubling rectification module through the second resonant voltage transformation module.
[0009] In some embodiments, the voltage transformation circuit includes: a switch group, which is arranged between the resonant voltage transformation module and the voltage transformation input source; the number of the switch groups is multiple, and the switch groups correspond to the resonant voltage transformation modules one by one. Wherein, the switch group controls the multiple resonant voltage transformation modules to alternately input current to the voltage doubling rectification module.
[0010] In some embodiments, the switch group includes: multiple high-side switches, which are connected between the primary end and the positive pole of the voltage transformation input source; multiple low-side switches, which are connected between the primary end and the negative pole of the voltage transformation input source. Wherein, when at least one of at least a part of the high-side switches is turned on, at least a part of the low-side switches are turned on.
[0011] In some embodiments, the high-side switch includes: a first high-side switch and a second high-side switch; the first high-side switch is connected between the first primary end and the positive pole of the voltage transformation input source; the second high-side switch is connected between the second primary end and the positive pole of the voltage transformation input source. Wherein, when the voltage transformation circuit is in the first state, the first high-side switch is turned on, the second high-side switch is turned off, and the voltage transformation input source inputs current to the first primary end; when the voltage transformation circuit is in the second state, the first high-side switch is turned off, the second high-side switch is turned on, and the voltage transformation input source inputs current to the second primary end.
[0012] In some embodiments, the low-side switch includes: a first low-side switch and a second low-side switch; the first low-side switch is connected between the first primary end and the negative pole of the transformer input source; the second low-side switch is connected between the second primary end and the negative pole of the transformer input source. Wherein, when the transformer circuit is in the first state, the first high-side switch and the second low-side switch are turned on, the first low-side switch and the second high-side switch are turned off, and the transformer input source inputs current to the first primary end; when the transformer circuit is in the second state, the first high-side switch and the second low-side switch are turned off, the first low-side switch and the second high-side switch are turned on, and the transformer input source inputs current to the second primary end.
[0013] In some embodiments, the switching frequencies of the first high-side switch, the first low-side switch, the second high-side switch, and the second low-side switch are equal; the duty cycles of the first high-side switch, the first low-side switch, the second high-side switch, and the second low-side switch are 1:1 respectively.
[0014] In some embodiments, the voltage-doubling rectification module includes: a boosting capacitor, one end of the boosting capacitor is electrically connected to the secondary end, and the other end of the boosting capacitor is electrically connected to one end of the flying capacitor.
[0015] In some embodiments, the voltage-doubling rectification module includes: a diode group, the diode group is arranged between the boosting capacitor and the transformer output source; the number of the diode groups is multiple, and the diode groups correspond to the boosting capacitor one by one.
[0016] In some embodiments, the diode group includes: a high-side diode group, the positive pole of the high-side diode group is electrically connected to the boosting capacitor or the flying capacitor, and the negative pole of the high-side diode group is electrically connected to the flying capacitor or the transformer output source; a low-side diode group, the positive pole of the low-side diode group is electrically connected to the secondary end, and the negative pole of the low-side diode group is electrically connected to the boosting capacitor.
[0017] In some embodiments, the boosting capacitor includes: a first boosting capacitor, one end of the first boosting capacitor is electrically connected to the first secondary end, and the other end of the first boosting capacitor is electrically connected to one end of the first flying capacitor; wherein, when the voltage conversion circuit is in the first state, the first boosting capacitor discharges and charges the first flying capacitor, and / or a second boosting capacitor, one end of the second boosting capacitor is electrically connected to the second secondary end, and the other end of the second boosting capacitor is electrically connected to the other end of the first flying capacitor. When the voltage conversion circuit is in the second state, the second boosting capacitor and the first flying capacitor discharge together to discharge to the voltage conversion output source.
[0018] In some embodiments, the high-side diode group includes: a first diode, the positive electrode of the first diode is electrically connected to the first boosting capacitor, and the negative electrode of the first diode is electrically connected to the first flying capacitor; a third diode, the positive electrode of the third diode is electrically connected to the first flying capacitor, and the negative electrode of the third diode is electrically connected to the voltage conversion output source.
[0019] In some embodiments, the low-side diode group includes: a second diode, the positive electrode of the second diode is electrically connected to the first secondary end, and the negative electrode of the second diode is electrically connected to the first boosting capacitor; a fourth diode, the positive electrode of the fourth diode is electrically connected to the second secondary end, and the negative electrode of the second diode is electrically connected to the second boosting capacitor.
[0020] In some embodiments, the voltage conversion output source includes an output capacitor and a voltage conversion output port. Wherein, when the voltage conversion circuit is in the first state, the output capacitor outputs current to the voltage conversion output port; when the voltage conversion circuit is in the second state, the secondary end charges the output capacitor through the voltage doubler rectification module.
[0021] In some embodiments, the resonant voltage conversion module includes: a transformer, the transformer includes an exciting inductor and a primary coil; a resonant inductor, one end of the resonant inductor is electrically connected to the exciting inductor and the primary coil, and the other end of the resonant inductor is electrically connected to the voltage conversion input end; a resonant capacitor, one end of the resonant capacitor is electrically connected to the resonant inductor, and the other end of the resonant capacitor is electrically connected to the voltage conversion input end. Wherein, the exciting inductor, the resonant inductor and the resonant capacitor form an inductor-inductor-capacitor resonant module.
[0022] In some embodiments, the voltage conversion input source includes a voltage stabilizing capacitor and a voltage conversion input port, and the voltage stabilizing capacitor is connected in parallel with the voltage conversion input port.
[0023] According to a second aspect of the embodiments of the present disclosure, a charging circuit is provided. The charging circuit includes: a rectification circuit; the voltage transformation circuit according to any one of the first aspect, the voltage transformation circuit being electrically connected to the rectification circuit, and the rectification circuit converting alternating current into direct current and inputting the direct current into the voltage transformation circuit.
[0024] According to a third aspect of the embodiments of the present disclosure, a power adapter is provided. The power adapter includes: the voltage transformation circuit according to any one of the first aspect, or the charging circuit according to any one of the second aspect.
[0025] According to a fourth aspect of the embodiments of the present disclosure, a power module is provided. The power module includes: the voltage transformation circuit according to any one of the first aspect, or the charging circuit according to any one of the second aspect.
[0026] According to a fifth aspect of the embodiments of the present disclosure, an electronic device is provided. The electronic device includes: a charging module, and the charging parameters for charging the electronic device by the charging module match the charging parameters output by the charging circuit according to the third aspect.
[0027] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: By enabling multiple resonant voltage transformation modules to alternately input current to the voltage multiplier rectification module, the present disclosure enables the voltage multiplier rectification module to multiply the output range of the resonant voltage transformation module, so that the voltage range that the voltage transformation circuit can output can cover the required range to meet the wide-range output.
[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.
[0030] Figure 1 is a circuit diagram of a voltage transformation circuit shown according to an exemplary embodiment.
[0031] Figure 2 is a circuit diagram of a voltage transformation circuit in a first state shown according to an exemplary embodiment.
[0032] Figure 3 is a circuit diagram of a voltage transformation circuit in a second state shown according to an exemplary embodiment.
[0033] Figure 4 is a circuit diagram of another voltage transformation circuit shown according to an exemplary embodiment.
[0034] Figure 5It is a schematic diagram of a current waveform shown according to an embodiment of a related technology.
[0035] Figure 6 It is a schematic diagram of a current waveform shown according to an exemplary embodiment.
[0036] Figure 7 It is a schematic diagram of a voltage output range shown according to an exemplary embodiment. Detailed implementation manners
[0037] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.
[0038] In the related technology, in order to enable the LLC circuit to have a wider output range, a buck conversion circuit (Buck circuit) can be connected to the output end of the LLC circuit. The LLC is used to achieve the purpose of high-frequency driving of the power adapter, thereby improving the efficiency of the power adapter, and the buck conversion circuit is used to achieve a wide range of voltage output.
[0039] However, the buck conversion circuit itself has certain losses. When achieving a wider output range, the voltage difference between the input end and the input-output is large, which will increase the losses of the buck conversion circuit, thereby reducing the overall efficiency of the power adapter.
[0040] To solve the above technical problems, according to an embodiment of the present disclosure, a voltage conversion circuit is provided, and the voltage conversion circuit includes: a voltage conversion input source and a voltage conversion output source; a plurality of resonant voltage conversion modules, the resonant voltage conversion module includes a primary end and a secondary end, the primary end is electrically connected to the voltage conversion input source, and the secondary end is electrically connected to the voltage conversion output source; a voltage multiplier rectification module, the voltage multiplier rectification module is connected between the secondary end and the voltage conversion output source, wherein the plurality of resonant voltage conversion modules alternately input current to the voltage multiplier rectification module.
[0041] The present disclosure enables the plurality of resonant voltage conversion modules to alternately input current to the voltage multiplier rectification module, so that the voltage multiplier rectification module multiplies the output interval of the resonant voltage conversion module, and the voltage interval that the voltage conversion circuit can output can cover the required range for wide-range output.
[0042] It can be understood that the LLC involved in the present disclosure is an inductor-inductor-capacitor resonant converter, and the inductor-inductor-capacitor resonant converter is a resonant converter that realizes a constant output voltage by controlling the switching frequency adjustment.
[0043] It is understandable that the power adapter involved in the present disclosure can be applicable to charge any one of the following listed devices to be charged.
[0044] It is understandable that the device to be charged involved in the present disclosure is a device with a charging power source. For example, the device to be charged can be a handheld device with wireless connection function, a vehicle-mounted device, etc. Currently, some examples of the device to be charged are: Mobile Phone, Pocket Personal Computer (PPC), palm computer, Personal Digital Assistant (PDA), notebook computer, tablet computer, wearable device, vehicle-mounted device, or a motor vehicle with a charging power source, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device can also be a vehicle-mounted device. It should be understood that the specific technologies and specific device forms adopted for the device to be charged in the embodiments of the present disclosure are not limited.
[0045] Figure 1 It is a circuit diagram of a voltage transformation circuit shown according to an exemplary embodiment.
[0046] In some embodiments, as Figure 1 shown, the voltage transformation circuit may include: a voltage transformation input source, a voltage transformation output source, a resonant voltage transformation module, and a voltage doubling rectification module.
[0047] Current can be input into the voltage transformation circuit from the voltage transformation input source, and the current after voltage transformation can leave the voltage transformation circuit from the voltage transformation output source.
[0048] The resonant voltage transformation module may include an LLC module and a transformer. The LLC module enables the voltage transformation circuit to output high-frequency current, thereby improving the output power of the voltage transformation circuit. The transformer can provide a certain degree of voltage change.
[0049] The resonant voltage transformation module may include a primary end and a secondary end. The primary end can be electrically connected to the voltage transformation input source, and the secondary end can be electrically connected to the voltage transformation output source. The current from the voltage transformation input source flows through the primary end, and an induced current can be generated at the secondary end, and the voltage generated at the secondary end is set according to the turns ratio of the primary end and the secondary end of the transformer.
[0050] One end of the voltage doubling rectification module can be electrically connected to the secondary end, and the other end of the voltage doubling rectification module can be electrically connected to the voltage transformation output source.
[0051] There can be multiple resonant voltage conversion modules, and the multiple resonant voltage conversion modules alternately input current to the voltage multiplier rectification module. The voltage multiplier rectification module can deliver the currents of different resonant voltage conversion modules to different capacitors for energy storage, and release the electrical energy in different capacitors, so that the current flowing into the voltage multiplier rectification module can be converted into high-frequency and high-voltage direct current.
[0052] The voltage range directly output by the resonant voltage conversion module is relatively narrow. Through the voltage multiplier rectification circuit to amplify the current voltage by multiples, the voltage range that the voltage conversion circuit can output can be amplified by multiples accordingly, and then the voltage range output by the power adapter can cover the required range to meet the wide-range output.
[0053] In some embodiments, as Figure 1 shown, the voltage conversion circuit may include: a flying capacitor, and the flying capacitor may be disposed in the voltage multiplier rectification module.
[0054] The flying capacitor can store and transfer electrical energy. After the flying capacitor is charged, it can be connected in series with other capacitors or the power input terminal, and then superimposed with other capacitors or the power supply to output a higher voltage to the voltage conversion output source, thereby further amplifying the voltage range that the voltage conversion circuit can output, so that the voltage range output by the power adapter can cover the required range to meet the wide-range output.
[0055] The flying capacitor can participate in the process of the voltage multiplier rectification module to amplify and output the current voltage throughout the process, that is, the currents of different resonant voltage conversion modules that alternately input current to the voltage multiplier rectification module all flow through the flying capacitor.
[0056] Since current = electric charge / time, based on the principle of conservation of electric charge, the flying capacitor that participates in the process of the voltage multiplier rectification module to amplify and output the current voltage throughout the process can make the currents flowing through different resonant voltage conversion modules equal, achieve current balance, and achieve the current sharing effect, thus avoiding the current concentrating on a certain resonant voltage conversion module and preventing the current of a certain resonant voltage conversion module from being too large, causing device damage.
[0057] At the same time, since the current does not concentrate on a certain resonant voltage conversion module and the magnitude of the current flowing through the resonant voltage conversion module is stable, the redundant value of the current that the resonant voltage conversion module can withstand can be reduced, thereby reducing the volume of the resonant voltage conversion module, which helps to miniaturize the power adapter.
[0058] The number of flying capacitors is N - 1, where N is the number of resonant voltage conversion modules. Exemplarily, as Figure 1 shown, when the number of resonant voltage conversion modules is 2, the number of flying capacitors can be 1; when the number of resonant voltage conversion modules is 4, the number of flying capacitors can be 3.
[0059] In some embodiments, it may include: a first flying capacitor C1, and the first flying capacitor C1 may be disposed within the voltage-doubling rectification module.
[0060] The voltage transformation circuit may be divided into a first state and a second state according to different resonant voltage transformation modules that deliver current to the voltage-doubling rectification module. Exemplarily, when the resonant voltage transformation module includes a first resonant voltage transformation module 1 and a second resonant voltage transformation module 2, the first resonant voltage transformation module 1 delivering current to the voltage-doubling rectification module is the first state of the voltage transformation circuit, and the second resonant voltage transformation module 2 delivering current to the voltage-doubling rectification module is the second state of the voltage transformation circuit.
[0061] When the voltage transformation circuit is in the first state, the resonant voltage transformation module may charge the first flying capacitor C1. The first flying capacitor C1 realizes the storage of electrical energy.
[0062] When the voltage transformation circuit is in the second state, the first flying capacitor C1 may discharge and jointly output current to the voltage transformation output source with the resonant voltage transformation module. The voltage of the resonant voltage transformation module and the voltage of the first flying capacitor C1 may be superimposed and output to the voltage transformation output source, thereby increasing the voltage output by the voltage transformation circuit and amplifying the voltage range that the voltage transformation circuit can output, so that the voltage range output by the power adapter can cover the required range to meet the wide-range output.
[0063] In some embodiments, as Figure 1 shown, the resonant voltage transformation module may include: a first resonant voltage transformation module 1 and a second resonant voltage transformation module 2.
[0064] The first resonant voltage transformation module 1 may include a first primary terminal and a first secondary terminal. The first primary terminal may be electrically connected to the voltage transformation input source, and the first secondary terminal may be electrically connected to the voltage transformation output source.
[0065] When the voltage transformation circuit is in the first state, the voltage transformation input source may output current to the voltage-doubling rectification module through the first resonant voltage transformation module 1. Exemplarily, the voltage transformation input source may input current to the voltage-doubling rectification module through the first secondary terminal of the first resonant voltage transformation module 1 and charge the first flying capacitor C1, so that the first flying capacitor C1 completes the storage of electrical energy.
[0066] The second resonant voltage transformation module 2 may include a second primary terminal and a second secondary terminal. The second primary terminal may be electrically connected to the voltage transformation input source, and the second secondary terminal may be electrically connected to the voltage transformation output source.
[0067] When the voltage conversion circuit is in the second state, the voltage conversion input source can output current to the voltage multiplier rectification module through the second resonant voltage conversion module 2. Exemplarily, the voltage conversion input element can input current to the voltage multiplier rectification module through the second secondary terminal of the second resonant voltage conversion module 2, and output current to the voltage conversion output source together with the first flying capacitor C1. The voltage of the second secondary terminal of the second resonant voltage conversion module 2 and the voltage of the first flying capacitor C1 can be superimposed and output to the voltage conversion output source, thereby increasing the voltage output by the voltage conversion circuit and amplifying the voltage range that the voltage conversion circuit can output, so that the voltage range output by the power adapter can cover the required range to meet the wide-range output requirement.
[0068] In some embodiments, as Figure 1 shown, the voltage conversion circuit may include: a switch group, which can be arranged between the resonant voltage conversion module and the voltage conversion input source. The switch group can control the connection relationship between the resonant voltage conversion module and the voltage conversion input source through its own on-off state, thereby changing the state of the voltage conversion circuit.
[0069] The number of switch groups can be multiple, and the number of switch groups can be the same as the number of resonant voltage conversion modules. Each switch group can correspondingly control one resonant voltage conversion module.
[0070] The switch group can control multiple resonant voltage conversion modules to alternately input current to the voltage multiplier rectification module, so that the voltage multiplier rectification module can alternately deliver the current of different resonant voltage conversion modules to different capacitors for energy storage, and release the electrical energy in different capacitors, so that the current flowing into the voltage multiplier rectification module can be converted into high-frequency and high-voltage direct current.
[0071] In some embodiments, the switch group may include: a plurality of high-side switches and a plurality of low-side switches.
[0072] The high-side switch can be connected between the primary terminal and the positive pole of the voltage conversion input source, and the low-side switch can be connected between the primary terminal and the negative pole of the voltage conversion input source.
[0073] . By making the on-off states of a part of the high-side switches and a part of the low-side switches opposite, a complete loop passing through multiple resonant voltage conversion modules can be formed in the circuit, so as to meet the design requirements of the current flow direction of the voltage multiplier rectification module, so that the voltage multiplier rectification module can amplify the current voltage and amplify the voltage range that the voltage conversion circuit can output.
[0074] In some embodiments, as Figure 1 shown, the high-side switch may include a first high-side switch Q1 and a second high-side switch Q3. The low-side switch may include a first low-side switch Q2 and a second low-side switch Q4.
[0075] The first high-side switch Q1 is connected between the first primary terminal and the positive pole of the transformer input source, and the first low-side switch Q2 is connected between the first primary terminal and the negative pole of the transformer input source.
[0076] The second high-side switch Q3 is connected between the second primary terminal and the positive pole of the transformer input source, and the second low-side switch Q4 is connected between the second primary terminal and the negative pole of the transformer input source.
[0077] When the transformer circuit is in the first state, the first high-side switch Q1 and the second low-side switch Q4 are turned on, and the first low-side switch Q2 and the second high-side switch Q3 are turned off. The transformer input source can input current to the voltage-doubling rectification module via the first primary terminal, and the second primary terminal can receive current from the voltage-doubling rectification module and return the current to the transformer input source, thereby forming a complete loop through the first resonant transformer module 1 and the second resonant transformer module 2, so that the voltage-doubling rectification module can amplify the current voltage and amplify the voltage range that the transformer circuit can output.
[0078] When the transformer circuit is in the second state, the first high-side switch Q1 and the second low-side switch Q4 are turned off, and the first low-side switch Q2 and the second high-side switch Q3 are turned on. The transformer input source can input current to the voltage-doubling rectification module via the second primary terminal, and the first primary terminal can receive current from the voltage-doubling rectification module and return the current to the transformer input source, thereby forming a complete loop through the first resonant transformer module 1 and the second resonant transformer module 2, so that the voltage-doubling rectification module can amplify the current voltage and amplify the voltage range that the transformer circuit can output.
[0079] In some embodiments, the switching frequencies of the first high-side switch Q1, the first low-side switch Q2, the second high-side switch Q3, and the second low-side switch Q4 can be equal, and the duty cycles of the first high-side switch Q1, the first low-side switch Q2, the second high-side switch Q3, and the second low-side switch Q4 can be 1:1. This can make the time for the transformer input source to input current to the voltage-doubling rectification module via the first resonant transformer module 1 the same as the time to input current to the voltage-doubling rectification module via the resonant transformer module, so that the charging and discharging times of the capacitors of the voltage-doubling rectification module and the flying capacitors are the same, avoiding time waste caused by not changing the state of the transformer circuit after the capacitor is fully charged or discharged, thereby increasing the current output frequency of the transformer circuit.
[0080] In some embodiments, as Figure 1 shown, the voltage-doubling rectification module may include: a boosting capacitor, one end of the boosting capacitor may be electrically connected to the secondary terminal, and the other end of the boosting capacitor may be electrically connected to one end of the flying capacitor. Exemplarily, the boosting capacitor may include a first boosting capacitor C10 and a second boosting capacitor C20.
[0081] When the boost capacitor is in a fully discharged state, the boost capacitor can charge itself through the secondary terminal;
[0082] When the boost capacitor is in a fully charged state, the boost capacitor can charge the flying capacitor together with the secondary terminal or supply power to the voltage transformation output source together with the flying capacitor.
[0083] Exemplarily, the voltage output by the secondary terminal can be U, and the voltage of the boost capacitor after charging can be U. When the fully charged boost capacitor and the secondary terminal charge the flying capacitor together, the voltage of the flying capacitor can be 2U.
[0084] When the fully charged boost capacitor and the flying capacitor supply power to the voltage transformation output source together, the voltages that the two can output can be superimposed on each other, that is, the voltage jointly output by the two is 3U, thereby increasing the voltage output by the voltage transformation circuit and amplifying the voltage range that the voltage transformation circuit can output, so that the voltage range output by the power adapter can cover the required range to meet the wide-range output.
[0085] In some embodiments, the voltage doubling rectification module may include: a diode group, and the diode group may be disposed between the boost capacitor and the voltage transformation output source. Due to the different positions where the resonant voltage transformation module is connected to the voltage doubling rectification module, through the arrangement of the diode group, when the voltage transformation input source inputs current to the voltage doubling rectification module through different resonant voltage transformation modules, the current can travel along a specific route under the constraints of the diode and the voltage difference, thereby forming different equivalent circuits. Thus, when the voltage transformation circuit is in different states, the same capacitor can be charged or discharged respectively, so as to meet the functional design of the voltage doubling rectification module.
[0086] The number of the diode groups can be multiple, and the diode groups can correspond to the boost capacitors one by one.
[0087] In some embodiments, the diode group may include a high-side diode group and a low-side diode group.
[0088] The positive electrode of the high-side diode group is electrically connected to the boost capacitor or the flying capacitor, and the negative electrode of the high-side diode group is electrically connected to the flying capacitor or the voltage transformation output source. The positive electrode of the low-side diode is electrically connected to the secondary terminal, and the negative electrode of the low-side diode is electrically connected to the boost capacitor.
[0089] Due to the different positions where the resonant voltage transformation module is connected to the voltage doubling rectification module, through the arrangement of the high-side diode group and the low-side diode group, when the voltage transformation input source inputs current to the voltage doubling rectification module through different resonant voltage transformation modules, the current can travel along a specific route under the constraints of the diode and the voltage difference, thereby forming different equivalent circuits. Thus, when the voltage transformation circuit is in different states, the same capacitor can be charged or discharged respectively, so as to meet the functional design of the voltage doubling rectification module.
[0090] In some embodiments, as Figure 1 shown, the boosting capacitor may include: a first boosting capacitor C10 and a second boosting capacitor C20.
[0091] One end of the first boosting capacitor C10 may be electrically connected to the first secondary end, and the other end of the first boosting capacitor C10 may be electrically connected to one end of the first flying capacitor C1;
[0092] One end of the second boosting capacitor C20 may be electrically connected to the second secondary end, and the other end of the second boosting capacitor C20 may be electrically connected to the other end of the first flying capacitor C1,
[0093] wherein, when the transformer circuit is in the first state, the first boosting capacitor C10 may discharge and charge the first flying capacitor C1, and the second boosting capacitor C20 may be charged through the second secondary end; when the transformer circuit is in the second state, the first boosting capacitor C10 may be charged through the first secondary end, and the second boosting capacitor C20 and the first flying capacitor C1 may jointly discharge to the transformer output source.
[0094] Exemplarily, the voltage output by the first secondary end and the voltage output by the second secondary end may be U. When the transformer circuit is in the first state, the second boosting capacitor C20 may be charged through the second secondary end, and the voltage of the second boosting capacitor C20 after charging may be U;
[0095] When the transformer circuit is in the second state, the first boosting capacitor C10 may be charged through the first secondary end, and the voltage of the first boosting capacitor C10 after charging may be U.
[0096] When the transformer circuit is in the first state, the first boosting capacitor C10 and the first secondary end may jointly charge the first flying capacitor C1, and the voltage of the first boosting capacitor C10 and the voltage of the first secondary end may be jointly superimposed on the first flying capacitor C1, and the voltage of the first flying capacitor C1 after charging may be 2U.
[0097] When the transformer circuit is in the second state, the second boosting capacitor C20, the first flying capacitor C1 and the second secondary end may jointly output current to the transformer output source, the voltage of the second boosting capacitor C20, the voltage of the first flying capacitor C1 and the voltage of the second secondary end may be jointly superimposed on the transformer output source, and the voltage jointly output by the second boosting capacitor C20, the first flying capacitor C1 and the second secondary end to the transformer output source may be 4U, which improves the voltage output by the transformer circuit and enlarges the voltage range that the transformer circuit can output, so that the voltage range output by the power adapter can cover the required range for wide-range output.
[0098] The present disclosure is not limited thereto. The voltage conversion circuit may also include only the first boosting capacitor C10 or the second boosting capacitor C20, or may include more boosting capacitors.
[0099] Figure 2 It is a circuit diagram of a voltage conversion circuit in a first state shown according to an exemplary embodiment. Figure 3 It is a circuit diagram of a voltage conversion circuit in a second state shown according to an exemplary embodiment.
[0100] In some embodiments, the voltage conversion output source may include an output capacitor Cout and a voltage conversion output port Vout. The output capacitor Cout can be used to store the current from the voltage doubling rectification module and then output the current to the output port.
[0101] When the voltage conversion circuit is in the first state, the output capacitor Cout outputs current to the voltage conversion output source port; when the voltage conversion circuit is in the second state, the secondary end charges the output capacitor Cout through the voltage doubling rectification module.
[0102] In some embodiments, as Figures 1 to 3 shown, the high-side diode group may include a first diode D1 and a third diode D3. The low-side diode group may include a second diode D2 and a fourth diode D4.
[0103] The positive electrode of the first diode D1 is electrically connected to the first boosting capacitor C10, and the negative electrode of the first diode D1 is electrically connected to the first flying capacitor C1; the positive electrode of the second diode D2 is electrically connected to the first secondary end, and the negative electrode of the second diode D2 is electrically connected to the first boosting capacitor C10; the positive electrode of the third diode D3 is electrically connected to the first flying capacitor C1, and the negative electrode of the third diode D3 is electrically connected to the voltage conversion output source; the positive electrode of the fourth diode D4 is electrically connected to the second secondary end, and the negative electrode of the second diode D2 is electrically connected to the second boosting capacitor C20.
[0104] When the voltage conversion circuit is in the first state, the first high-side switch Q1 and the second low-side switch Q4 may be turned on, and the second high-side switch Q3 and the first low-side switch Q2 may be turned off. The current flows from the voltage conversion input source through the first high-side switch Q1 to the first resonant voltage conversion module 1. After the current undergoes the first voltage conversion in the first resonant voltage conversion module 1, it flows from the first secondary end into the voltage doubling rectification module.
[0105] The current starts from the first secondary end, flows through the first boosting capacitor C10 in the fully charged state. The first secondary end and the first boosting capacitor C10 jointly charge the first flying capacitor C1, and then the current flows to the fourth diode D4.
[0106] And an induced current is generated at the second secondary terminal, and the induced current generated at the second secondary terminal can charge the second boost capacitor C20. The induced current can then return to the transformer input source via the second resonant transformer module 2 and the second low-side switch Q4.
[0107] The charged capacitor in the fully charged state can supply current to the transformer output port Vout.
[0108] When the transformer circuit is in the second state, the second high-side switch Q3 and the first low-side switch Q2 can be turned on, and the first high-side switch Q1 and the second low-side switch Q4 can be turned off. Current flows from the transformer input source through the second high-side switch Q3 to the second resonant transformer module 2. After the current undergoes the first transformation in the second resonant transformer module 2, it flows into the voltage multiplier rectifier module from the second secondary terminal.
[0109] The current starts from the second secondary terminal, flows through the second boost capacitor C20 in the fully charged state, and the second secondary terminal, the second boost capacitor C20 and the first flying capacitor C1 together charge the output capacitor Cout.
[0110] And an induced current is generated at the first secondary terminal, and the induced current can charge the first boost capacitor C10. The induced current can then return to the transformer input source via the first resonant transformer module 1 and the first low-side switch Q2.
[0111] Through the setting of the diode and the voltage difference, the current travels in the designed route in the voltage multiplier rectifier module, thereby increasing the voltage output by the transformer circuit and amplifying the voltage range that the transformer circuit can output, so that the voltage range output by the power adapter can cover the required range to meet the wide-range output demand.
[0112] In some embodiments, the resonant transformer module may include: a transformer, a resonant inductor, and a resonant capacitor.
[0113] The transformer may include an exciting inductor, a primary coil, and a secondary coil, and the transformer can be used to initially increase or decrease the voltage. And since the voltage multiplier rectifier module can multiply the current voltage, the turns ratio of the transformer coil can be reduced, thereby saving the volume of the transformer.
[0114] One end of the resonant inductor can be electrically connected to the exciting inductor and the primary coil, and the other end of the resonant inductor can be electrically connected to the transformer input terminal;
[0115] One end of the resonant capacitor can be electrically connected to the resonant inductor, and the other end of the resonant capacitor can be electrically connected to the transformer input terminal.
[0116] Wherein, the exciting inductor, the resonant inductor, and the resonant capacitor can form an inductor-inductor-capacitor resonant module.
[0117] Exemplarily, as Figure 1 shown, the first resonant transformer module 1 may include a first transformer TrA, a first resonant inductor LkgA, and a first resonant capacitor CrA. The first transformer TrA may include a first exciting inductor LmgA; the second resonant transformer module 2 may include a second transformer TrB, a second resonant inductor LkgB, and a second resonant capacitor CrB. The second transformer TrB may include a second exciting inductor LmgB.
[0118] The resonant inductor, resonant capacitor, and exciting inductor can form different resonant frequencies according to different working modes. Compared with a series resonant converter, the exciting inductor and leakage inductance of the resonant converter can be utilized, thus greatly reducing the occupied volume.
[0119] And due to the presence of the inductor-inductor-capacitor resonant module, the switch of the primary end circuit of the transformer circuit can perform zero-voltage switching on and zero-voltage switching off. On the other hand, the secondary end circuit of the transformer circuit can achieve zero-current switching on and zero-current switching off. Thereby, the loss during switch turn-on and turn-off is greatly reduced, and the efficiency of the power adapter is improved.
[0120] In some embodiments, the transformer input source may include a voltage stabilizing capacitor Cin and a transformer input port Vin, and the voltage stabilizing capacitor Cin is connected in parallel with the transformer input port Vin.
[0121] The transformer input port Vin may be the current input port of the transformer circuit, and the voltage stabilizing capacitor Cin can be used to filter out the clutter and pulses in the input current and stabilize the voltage.
[0122] Figure 4 is a circuit diagram of another transformer circuit shown according to an exemplary embodiment.
[0123] In some other embodiments, the resonant transformer module, diode group, switch group, boost capacitor, and flying capacitor can be provided in multiple numbers, thereby further doubling the current and voltage and expanding the voltage output of the transformer circuit.
[0124] Among them, the number of the resonant transformer module, diode group, switch group, and boost capacitor can be the same, and the number of the flying capacitor can be one less than the number of the resonant transformer module.
[0125] Exemplarily, as Figure 4As shown, the voltage conversion circuit may further include a third resonant voltage conversion module 3 and a second flying capacitor C2. The diode group may include a fifth diode D5 and a sixth diode D6. The switch group may include a third high-side switch Q5 and a third low-side switch Q6. The voltage multiplier rectification module may include a third boosting capacitor C30. The third resonant voltage conversion module 3 may include a third transformer TrC, a third resonant inductor LkgC, and a third resonant capacitor CrC. The third transformer TrC may include a third exciting inductor LmgC
[0126] Among them, the conduction state of the first high-side switch Q1 may be the same as that of the third low-side switch Q6. The conduction state of the first low-side switch Q2 may be the same as that of the second high-side switch Q3. The conduction state of the second low-side switch Q4 may be the same as the conduction state of the third high-side switch Q5
[0127] For the convenience of calculation and design, the switch group may also be set such that the conduction states of the first high-side switch Q1, the second low-side switch Q4, and the third high-side switch Q5 are the same, and the conduction states of the first low-side switch Q2, the second high-side switch Q3, and the third low-side switch Q6 are the same
[0128] The remaining principles are the same as those of the above embodiments and will not be elaborated here
[0129] Figure 5 is a schematic diagram of a current waveform shown according to an embodiment of a related technology Figure 6 is a schematic diagram of a current waveform shown according to an exemplary embodiment
[0130] Figure 5 is a schematic diagram of the current waveforms of the respective resonant voltage conversion modules of a voltage conversion circuit having three resonant voltage conversion modules in an embodiment of a related technology Figure 7 is a schematic diagram of the current waveforms of the respective resonant voltage conversion modules of a voltage conversion circuit having three resonant voltage conversion modules in an embodiment of the present disclosure
[0131] As Figure 5 shown, the currents of the three resonant voltage conversion modules are inconsistent, resulting in a phenomenon where the current is concentrated in a certain resonant voltage conversion module. As Figure 7 shown, the current distribution of the three resonant voltage conversion modules is uniform, and the current magnitudes borne by each resonant voltage conversion module are the same. Thus, the concentration of current in a certain resonant voltage conversion module is avoided, preventing excessive current in a certain resonant voltage conversion module and causing damage
[0132] Figure 7 is a comparison diagram of voltage output ranges shown according to an exemplary embodiment
[0133] As Figure 7As shown, curve A is the voltage output range curve of the voltage conversion circuit according to an embodiment of the present disclosure, and curve B is the voltage output range curve of the voltage conversion circuit according to an embodiment of the related art. Since the resonance frequency is fixed after the parameters of the resonance inductor, resonance capacitor, and excitation inductor are fixed, the output range of the voltage can be changed by changing the switching frequency.
[0134] The voltage output range of the voltage conversion circuit in the related art embodiment is small and difficult to meet the requirements of technologies such as fast charging. However, the voltage output range of the voltage conversion circuit in the embodiment of the present disclosure is large. Exemplarily, as Figure 7 shown, the voltage output range of the voltage conversion circuit in the embodiment of the present disclosure can cover 5V - 28V, thereby meeting the voltage output requirements for charging electronic devices.
[0135] Based on the same concept, the embodiment of the present disclosure further provides a charging circuit.
[0136] In some embodiments, the charging circuit may include a rectification circuit and a voltage conversion circuit. The output terminal of the rectification circuit may be connected to the voltage conversion input port Vin of the voltage conversion circuit. Exemplarily, the rectification circuit may convert 220V alternating current into direct current and input it into the voltage conversion circuit for voltage conversion processing.
[0137] Based on the same concept, the embodiment of the present disclosure further provides a power adapter. A power adapter may be a device for converting an external power source to meet the charging parameter requirements of a device to be charged.
[0138] Among them, the device to be charged may be a laptop computer, a desktop computer, a mobile phone, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, a translator, a watch, a bracelet, and a motor vehicle with a charging power source, etc., and may be any device to be charged with a charging power source. In the following description, a mobile phone is taken as an example for illustration, but the present disclosure is not limited thereto.
[0139] In some embodiments, the power adapter may include a charging circuit. The power adapter may convert the current and voltage of the external power source into the current and voltage that meet the charging parameter requirements of the device to be charged. Exemplarily, the power adapter may convert 220V alternating current into direct current of 5V - 28V.
[0140] In some embodiments, the power adapter may only include a voltage conversion circuit to adapt to a DC power source.
[0141] Based on the same concept, the embodiment of the present disclosure further provides a power module. A power module may be a device that converts other forms of energy into electrical energy and provides electrical energy.
[0142] Among them, the power supply module can be a mobile power supply, a rechargeable battery built in an electronic device, a storage battery, a fixed charging pile, etc., and can be a device with a charging function. In the following description, a mobile power supply is taken as an example for illustration, but the present disclosure is not limited thereto.
[0143] In some embodiments, the power supply module may include a charging circuit, and the power supply module can convert the current and voltage of an external power supply into the current and voltage that meet the charging parameter requirements of the power supply module. Exemplarily, the power supply module can convert 220V alternating current into 5V - 28V direct current.
[0144] In some embodiments, the power supply module may only include a voltage conversion circuit to adapt to a DC power supply.
[0145] Based on the same concept, an embodiment of the present disclosure also provides an electronic device.
[0146] Among them, the electronic device can be a laptop computer, a desktop computer, a mobile phone, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, a translator, a watch, a bracelet, and a motor vehicle with a charging power supply, etc., and can be any electronic device with a charging power supply. In the following description, a mobile phone is taken as an example for illustration, but the present disclosure is not limited thereto.
[0147] In some embodiments, the electronic device may include a charging module, and the charging circuit can charge the electronic device through the charging module. Exemplarily, the charging module can be a combination of a charging port of the electronic device and charging-related circuit components.
[0148] The charging parameters of the charging module for the electronic device 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, and realize fast charging of the electronic device.
[0149] In the embodiment of the present disclosure, by alternately inputting current from multiple resonant voltage conversion modules to the voltage multiplier rectification module, the voltage multiplier rectification module multiplies the output range of the resonant voltage conversion module, so that the voltage range that the voltage conversion circuit can output can cover the required range for wide-range output.
[0150] It can be understood that "multiple" in the present disclosure means two or more, and other quantifiers are similar. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The singular forms of "a", "the", and "said" also aim to include the plural forms unless the context clearly indicates otherwise.
[0151] It can be further understood that the terms "second", "second", 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, expressions such as "second", "second", etc. can be used interchangeably completely. For example, without departing from the scope of the present disclosure, the second information can also be referred to as the second information, and similarly, the second information can also be referred to as the second information.
[0152] It can be further understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.
[0153] It can be further understood that unless otherwise specified, "connection" includes direct connection without other components between the two, and also includes indirect connection with other elements between the two.
[0154] It can be 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 these operations to be performed in the specific order or serial order shown, or requiring all the operations shown to obtain the desired result. In a specific environment, multitasking and parallel processing may be advantageous.
[0155] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include well-known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.
[0156] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.
Claims
1. A voltage conversion circuit, characterized in that, the voltage conversion circuit includes: a voltage conversion input source and a voltage conversion output source; a plurality of resonant voltage conversion modules, each of the resonant voltage conversion modules includes a primary end and a secondary end, the primary end is electrically connected to the voltage conversion input source, and the secondary end is electrically connected to the voltage conversion output source; a voltage multiplier rectification module, the voltage multiplier rectification module is connected between the secondary end and the voltage conversion output source, wherein, the plurality of resonant voltage conversion modules alternately input current to the voltage multiplier rectification module.
2. The voltage conversion circuit according to claim 1, characterized in that, it includes: flying capacitors, the flying capacitors are arranged in the voltage multiplier rectification module, and the number of the flying capacitors is N - 1, wherein, N is the number of the resonant voltage conversion modules.
3. The voltage conversion circuit according to claim 2, characterized in that, it includes: a first flying capacitor, the first flying capacitor is arranged in the voltage multiplier rectification module, wherein, the voltage conversion circuit includes a first state and a second state; when the voltage conversion circuit is in the first state, the first flying capacitor is charged; when the voltage conversion circuit is in the second state, the first flying capacitor discharges and outputs current to the voltage conversion output source.
4. The voltage conversion circuit according to claim 3, characterized in that, the resonant voltage conversion module includes: a first resonant voltage conversion module, the first resonant voltage conversion module includes a first primary end and a first secondary end, the first primary end is electrically connected to the voltage conversion input source, and the first secondary end is electrically connected to the voltage conversion output source; a second resonant voltage conversion module, the second resonant voltage conversion module includes a second primary end and a second secondary end, the second primary end is electrically connected to the voltage conversion input source, and the second secondary end is electrically connected to the voltage conversion output source, wherein, when the voltage conversion circuit is in the first state, the voltage conversion input source outputs current to the voltage multiplier rectification module through the first resonant voltage conversion module; when the voltage conversion circuit is in the second state, the voltage conversion input source outputs current to the voltage multiplier rectification module through the second resonant voltage conversion module.
5. The voltage conversion circuit according to claim 4, characterized in that, it includes: a switch group, the switch group is arranged between the resonant voltage conversion module and the voltage conversion input source; the number of the switch groups is multiple, and the switch groups correspond to the resonant voltage conversion modules one by one, wherein, the switch group controls the plurality of resonant voltage conversion modules to alternately input current to the voltage multiplier rectification module.
6. The voltage conversion circuit according to claim 5, characterized in that, the switch group includes: a plurality of high-side switches, the high-side switches are connected between the primary end and the positive pole of the voltage conversion input source; a plurality of low-side switches, the low-side switches are connected between the primary end and the negative pole of the voltage conversion input source, wherein, when at least a part of the high-side switches are turned on, at least a part of the low-side switches are turned on.
7. The voltage conversion circuit according to claim 6, characterized in that, the high-side switch includes: a first high-side switch and a second high-side switch; The first high-side switch is connected between the first primary terminal and the positive electrode of the transformer input source; The second high-side switch is connected between the second primary terminal and the positive electrode of the transformer input source, wherein, when the transformer circuit is in the first state, the first high-side switch is turned on, the second high-side switch is turned off, and the transformer input source inputs current to the first primary terminal; when the transformer circuit is in the second state, the first high-side switch is turned off, the second high-side switch is turned on, and the transformer input source inputs current to the second primary terminal.
8. The transformer circuit according to claim 7, characterized in that, the low-side switch includes: a first low-side switch and a second low-side switch; A first low-side switch, the first low-side switch is connected between the first primary terminal and the negative electrode of the transformer input source; A second low-side switch, the second low-side switch is connected between the second primary terminal and the negative electrode of the transformer input source, wherein, when the transformer circuit is in the first state, the first high-side switch and the second low-side switch are turned on, the first low-side switch and the second high-side switch are turned off, and the transformer input source inputs current to the first primary terminal; when the transformer circuit is in the second state, the first high-side switch and the second low-side switch are turned off, the first low-side switch and the second high-side switch are turned on, and the transformer input source inputs current to the second primary terminal.
9. The transformer circuit according to claim 8, characterized in that, the switching frequencies of the first high-side switch, the first low-side switch, the second high-side switch and the second low-side switch are equal; the duty cycles of the first high-side switch, the first low-side switch, the second high-side switch and the second low-side switch are 1:1 respectively.
10. The transformer circuit according to claim 4, characterized in that, the voltage-doubling rectification module includes: A boosting capacitor, one end of the boosting capacitor is electrically connected to the secondary terminal, and the other end of the boosting capacitor is electrically connected to one end of the flying capacitor.
11. The transformer circuit according to claim 10, characterized in that, the voltage-doubling rectification module includes: A diode group, the diode group is arranged between the boosting capacitor and the transformer output source; the number of the diode groups is multiple, and the diode groups correspond to the boosting capacitors one by one.
12. The transformer circuit according to claim 11, characterized in that, the diode group includes: A high-side diode group, the positive electrode of the high-side diode group is electrically connected to the boosting capacitor or the flying capacitor, and the negative electrode of the high-side diode group is electrically connected to the flying capacitor or the transformer output source; A low-side diode group, the positive electrode of the low-side diode group is electrically connected to the secondary terminal, and the negative electrode group of the low-side diode group is electrically connected to the boosting capacitor.
13. The transformer circuit according to claim 12, characterized in that, the boosting capacitor includes: The first boosting capacitor, one end of the first boosting capacitor is electrically connected to the first secondary end, and the other end of the first boosting capacitor is electrically connected to one end of the first flying capacitor; wherein, when the voltage conversion circuit is in the first state, the first boosting capacitor discharges and charges the first flying capacitor, and / or The second boosting capacitor, one end of the second boosting capacitor is electrically connected to the second secondary end, and the other end of the second boosting capacitor is electrically connected to the other end of the first flying capacitor. When the voltage conversion circuit is in the second state, the second boosting capacitor and the first flying capacitor discharge together to discharge to the voltage conversion output source.
14. The voltage conversion circuit according to claim 13, characterized in that, The high-side diode group includes: The first diode, the positive electrode of the first diode is electrically connected to the first boosting capacitor, and the negative electrode of the first diode is electrically connected to the first flying capacitor; The third diode, the positive electrode of the third diode is electrically connected to the first flying capacitor, and the negative electrode of the third diode is electrically connected to the voltage conversion output source.
15. The voltage conversion circuit according to claim 14, characterized in that, The low-side diode group includes: The second diode, the positive electrode of the second diode is electrically connected to the first secondary end, and the negative electrode of the second diode is electrically connected to the first boosting capacitor; The fourth diode, the positive electrode of the fourth diode is electrically connected to the second secondary end, and the negative electrode of the second diode is electrically connected to the second boosting capacitor.
16. The voltage conversion circuit according to claim 3, characterized in that, The voltage conversion output source includes an output capacitor and a voltage conversion output port, wherein, when the voltage conversion circuit is in the first state, the output capacitor outputs current to the voltage conversion output source port; When the voltage conversion circuit is in the second state, the secondary end charges the output capacitor through the voltage multiplier rectification module.
17. The voltage conversion circuit according to claim 1, characterized in that, The resonant voltage conversion module includes: A transformer, the transformer includes an exciting inductor and a primary coil; A resonant inductor, one end of the resonant inductor is electrically connected to the exciting inductor and the primary coil, and the other end of the resonant inductor is electrically connected to the voltage conversion input end; A resonant capacitor, one end of the resonant capacitor is electrically connected to the resonant inductor, and the other end of the resonant capacitor is electrically connected to the voltage conversion input end, wherein, the exciting inductor, the resonant inductor and the resonant capacitor form an inductor-inductor-capacitor resonant module.
18. The voltage conversion circuit according to claim 1, characterized in that, The voltage conversion input source includes a voltage stabilizing capacitor and a voltage conversion input port, and the voltage stabilizing capacitor is connected in parallel with the voltage conversion input port.
19. A charging circuit, characterized in that, comprises: A rectifying circuit; The voltage conversion circuit according to any one of claims 1 to 18, the voltage conversion circuit is electrically connected to the rectifying circuit, and the rectifying circuit converts alternating current into direct current and inputs it into the voltage conversion circuit.
20. A power adapter, characterized in that, comprises: The voltage conversion circuit according to any one of claims 1 to 18, or The charging circuit according to claim 19.
21. A power supply module, characterized in that it includes: a voltage conversion circuit according to any one of claims 1 to 18, or the charging circuit according to claim 19.
22. An electronic device, characterized in that it includes: a charging module, and the charging parameters for charging the electronic device by the charging module match the charging parameters output by the charging circuit according to claim 19.