Voltage conversion circuit, signal function circuit and electronic equipment

Abstract

The utility model discloses a voltage conversion circuit, a signal function circuit and electronic equipment, and the voltage conversion circuit comprises a power switch circuit which comprises a first switch sub-circuit and a second switch sub-circuit, and the first switch sub-circuit is coupled with the second switch sub-circuit and is used for being coupled with a power circuit; the integrated inductance circuit comprises a first inductance sub-circuit and a second inductance sub-circuit, the first inductance sub-circuit is coupled with the first switch sub-circuit and the second switch sub-circuit and is coupled with the second inductance sub-circuit, and the second inductance sub-circuit is coupled with the first switch sub-circuit and the second switch sub-circuit; wherein the first inductance sub-circuit has first equivalent leakage inductance, and the second inductance sub-circuit has second equivalent leakage inductance; and the capacitance circuit is coupled with the first inductance sub-circuit and the second inductance sub-circuit and is used for being coupled with a rear working circuit. By means of the mode, the voltage conversion circuit effectively solves the direct current bias problem, a current sharing control circuit is omitted, and the product reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a voltage conversion circuit, a signal function circuit and an electronic device. BACKGROUND

[0002] Nowadays, with the upgrading and wide application of battery technology, energy storage devices are becoming more and more known to consumers and markets, and are being applied more and more. The mobile energy storage market is one branch, and for cost considerations, more and more manufacturers consider low-voltage battery solutions. The characteristics of low-voltage batteries determine that the charging current is usually tens of amperes or even hundreds of amperes, so that the conventional single-channel BUCK (electric energy transfer, conversion) circuit cannot meet the current stress requirements, and therefore an interleaved BUCK circuit solution is derived.

[0003] However, the interleaved BUCK circuit inevitably has defects such as layout differences and inductance differences, so that there is usually a direct current bias, and it is difficult to achieve current sharing or requires an additional detection control circuit to achieve current sharing, thereby increasing the difficulty of supply chain and quality control, having low reliability, and bringing some adverse effects to the tolerance design of the product. CONTENT OF THE INVENTION

[0004] The technical problem solved by the present application is to provide a voltage conversion circuit, a signal function circuit and an electronic device, which can solve the problem that the voltage conversion circuit in the prior art has a direct current bias, cannot achieve current sharing or requires an additional detection control circuit to achieve current sharing, thereby increasing the difficulty of supply chain and quality control, having low reliability, and bringing some adverse effects to the tolerance design of the product.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a voltage conversion circuit, wherein the voltage conversion circuit comprises: a power switch circuit comprising a first switch sub-circuit and a second switch sub-circuit, the first switch sub-circuit being coupled to the second switch sub-circuit and being used to be coupled to a power supply circuit; an integrated inductor circuit comprising a first inductor sub-circuit and a second inductor sub-circuit, the first inductor sub-circuit being coupled to the first switch sub-circuit and the second switch sub-circuit and being coupled to the second inductor sub-circuit, and the second inductor sub-circuit being coupled to the first switch sub-circuit and the second switch sub-circuit; wherein the first inductor sub-circuit has a first equivalent leakage inductance, and the second inductor sub-circuit has a second equivalent leakage inductance; and a capacitor circuit coupled to the first inductor sub-circuit and the second inductor sub-circuit and used to be coupled to a post-work circuit.

[0006] The first inductor sub-circuit comprises a first coil winding and a first inductor, and the second inductor sub-circuit comprises a second coil winding and a second inductor. A first end of the first coil winding is coupled to the first switch sub-circuit and the second switch sub-circuit. A second end of the first coil winding is coupled to a first end of the second inductor. A second end of the second inductor is coupled to a first end of the second coil winding and the capacitor circuit. A second end of the second coil winding is coupled to a first end of the second inductor. A second end of the second inductor is coupled to the first switch sub-circuit and the second switch sub-circuit. The first coil winding is coupled to the second coil winding.

[0007] The first switch sub-circuit comprises a first switch tube and a fourth switch tube, and the second switch sub-circuit comprises a second switch tube and a third switch tube. A second end of the first switch tube is coupled to a second end of the second switch tube and is configured to be coupled to a first end of the power supply circuit. A third end of the first switch tube is coupled to a second end of the third switch tube and a first end of the first coil winding. A third end of the second switch tube is coupled to a second end of the fourth switch tube and a second end of the second inductor. A third end of the third switch tube is coupled to a third end of the fourth switch tube and is configured to be coupled to a second end of the power supply circuit.

[0008] The voltage conversion circuit further comprises a control circuit coupled to a first end of each of the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube. The control circuit is configured to synchronously send a first driving control signal to the first switch tube and the fourth switch tube, and synchronously send a second driving control signal to the second switch tube and the third switch tube.

[0009] The first inductor has a first inductance value equal to or smaller than the first equivalent leakage inductance, and the second inductor has a second inductance value equal to or smaller than the second equivalent leakage inductance.

[0010] The number of the first switch sub-circuit, the second switch sub-circuit, the first inductor sub-circuit, and the second inductor sub-circuit is equal and is at least two. A second end of each first switch sub-circuit is configured to be coupled to a first end of the power supply circuit. A third end of each second switch sub-circuit is coupled to a second end of the capacitor circuit and is configured to be coupled to a second end of the power supply circuit. A third end of each first switch sub-circuit is coupled to a second end of one second switch sub-circuit and a first end of one first inductor sub-circuit. Each first inductor sub-circuit is coupled to one second inductor sub-circuit. A second end of each first inductor sub-circuit is coupled to a first end of each second inductor sub-circuit and a first end of the capacitor circuit. A second end of each second inductor sub-circuit is coupled to a first end of another first inductor sub-circuit which is not coupled to the second inductor sub-circuit. A first end of each first inductor sub-circuit is coupled to a second end of one second inductor sub-circuit.

[0011] The voltage conversion circuit further comprises a control circuit, the first switch sub-circuit comprises a fifth switch tube, and the second switch sub-circuit comprises a sixth switch tube.

[0012] The difference between the first equivalent leakage inductance and the second equivalent leakage inductance is not greater than the product of the first equivalent leakage inductance and the set proportionality coefficient.

[0013] To solve the above technical problems, the application adopts another technical solution: providing a signal function circuit, wherein the signal function circuit comprises a power supply circuit, a voltage conversion circuit and a post working circuit, the voltage conversion circuit is coupled to the power supply circuit and the post working circuit; wherein the voltage conversion circuit is any one of the above.

[0014] To solve the above technical problems, the application adopts another technical solution: providing an electronic device, wherein the electronic device comprises a function integrated circuit; wherein the function integrated circuit is any one of the above voltage conversion circuits, or the signal function circuit as described above.

[0015] The beneficial effects of the application are: different from the prior art, the first switch sub-circuit of the power switch circuit in the voltage conversion circuit provided by the application is coupled to the second switch sub-circuit and is coupled to the power supply circuit, the first inductor sub-circuit in the integrated inductor circuit is coupled to the first switch sub-circuit and the second switch sub-circuit, and is coupled to the second inductor sub-circuit, and the second inductor sub-circuit is coupled to the first switch sub-circuit and the second switch sub-circuit; the first inductor sub-circuit has a first equivalent leakage inductance, and the second inductor sub-circuit has a second equivalent leakage inductance; the capacitor circuit is coupled to the first inductor sub-circuit and the second inductor sub-circuit, and is coupled to the post working circuit, so as to effectively realize the transfer and conversion of electric energy by the cooperation of the first equivalent leakage inductance, the second equivalent leakage inductance and the capacitor circuit, and also effectively realize the transfer of electric energy from the high-voltage side to the low-voltage side by the mutual coupling of the first inductor sub-circuit and the second inductor sub-circuit, thereby effectively solving the direct current bias problem, and eliminating the current sharing control circuit, which reduces the difficulty of supply chain and quality control, improves the product reliability, facilitates the tolerance design of the product, and also adapts to lower voltage and larger current power supply applications, thereby simplifying the circuit architecture of the power conversion unit of the energy storage device, and improving the economy and reliability of the charging module integrated with the voltage conversion circuit. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description only are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 is a structural schematic diagram of a first embodiment of the voltage conversion circuit of the present application;

[0018] Figure 2 is a structural schematic diagram of a second embodiment of the voltage conversion circuit of the present application;

[0019] Figure 3 is Figure 2 the power switch circuit in the voltage conversion circuit in

[0020] Figure 4 is Figure 2 the power switch circuit in the voltage conversion circuit in

[0021] Figure 5 is Figure 2 the power switch circuit in the voltage conversion circuit in

[0022] Figure 6 is a structural schematic diagram of a third embodiment of the voltage conversion circuit of the present application;

[0023] Figure 7 is a structural schematic diagram of an embodiment of the signal function circuit of the present application;

[0024] Figure 8 is a structural schematic diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0026] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. All directional references, such as up, down, left, right, front, back, etc., used in the description of the present application are only used for the purpose of explanation and are not intended to limit the scope of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a list of steps or units is not limited to the listed steps or units, but can optionally include additional steps or units not listed or can optionally include other steps or units inherent to such processes, methods, products or devices.

[0027] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are combinable with each other.

[0028] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a first embodiment of a voltage conversion circuit of the present application. In the present embodiment, the voltage conversion circuit 10 includes a power switching circuit 11, an integrated inductor circuit 12, and a capacitor circuit 13.

[0030] Among them, the voltage conversion circuit 10 provided in the present application is specifically applied to electronic devices with voltage regulation and conversion requirements, such as photovoltaic charging devices and mobile energy storage devices, to receive input of external power supply and perform voltage conversion on the power supply input, thereby meeting the requirements of charging, energy storage and other signal functions. Of course, in other embodiments, the voltage conversion circuit 10 can also be specifically provided in servers, communication devices and other any reasonable electronic devices, and the present embodiment does not limit this.

[0031] Specifically, the power switch circuit 11 further comprises a first switch sub-circuit 111 and a second switch sub-circuit 112, the first switch sub-circuit 111 is coupled with the second switch sub-circuit 112, and is used to realize physical and electrical connection with the external power supply circuit 101, to receive the direct current signal or alternating current signal with constant current and / or voltage provided by the power supply circuit 101, and to adjust and convert the power input of the power supply circuit 101 by using the internal switching action mechanism, such as the switching mechanism of IGBT (Insulated Gate Bipolar Transistor), high-frequency transistor, MOS (Metal Oxide Semiconductor Field Effect Transistor), etc.

[0032] It is worth noting that the power supply circuit 101 can be any reasonable direct current or alternating current power supply, such as a direct current output battery, a direct current stabilizer, a photovoltaic power supply, an energy storage power supply, etc., or a power supply adjustment circuit that receives and converts and adjusts the power supply from the power grid, photovoltaic power supply, independent generator or other any reasonable upper power supply to obtain direct current or alternating current power supply output. The present embodiment does not limit this.

[0033] In addition, "coupled" in this article refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit in the text, it means that the first circuit can be directly connected to the second circuit through electrical connection or wireless transmission, optical transmission, etc. Signal connection method, or indirectly electrically connected or signal connected to the second circuit through other circuits or connection means.

[0034] The integrated inductor circuit 12 specifically further comprises a first inductor sub-circuit 121 and a second inductor sub-circuit 122, the first inductor sub-circuit 121 is coupled with the first switch sub-circuit 111 and the second switch sub-circuit 112, and the second inductor sub-circuit 122 is coupled with the first switch sub-circuit 111 and the second switch sub-circuit 112.

[0035] And the first inductor sub-circuit 121 is further coupled with the second inductor sub-circuit 122, that is, the first inductor sub-circuit 121 and the second inductor sub-circuit 122 are magnetically connected, so that when one of the first inductor sub-circuit 121 and the second inductor sub-circuit 122 flows through an electric signal, the other will induce a corresponding size of the electric signal, so as to realize energy transfer between different voltage sides.

[0036] Among them, the first inductor sub-circuit 121 further has a first equivalent leakage inductance, and the second inductor sub-circuit 122 has a second equivalent leakage inductance.

[0037] The capacitor circuit 13 is further coupled to the first inductor sub-circuit 121 and the second inductor sub-circuit 122, and is used to be coupled to the external post-working circuit 102, so as to effectively realize energy transfer and conversion through the cooperation of the first equivalent leakage inductance, the second equivalent leakage inductance and the capacitor circuit 13, and provide the converted voltage output to the post-working circuit 102 to drive the post-working circuit 102 to work or make it realize other arbitrary reasonable signal functions.

[0038] It is worth noting that the post-working circuit 102 can be a load circuit working by using the voltage output of the voltage conversion circuit 10, or a lower circuit realizing other arbitrary reasonable signal functions by using the voltage output of the voltage conversion circuit 10.

[0039] The above scheme can effectively realize energy transfer and conversion through the cooperation of the first equivalent leakage inductance, the second equivalent leakage inductance and the capacitor circuit 13, and can also effectively realize energy transfer from the high-voltage side to the low-voltage side through the mutual coupling of the first inductor sub-circuit 121 and the second inductor sub-circuit 122, thereby effectively solving the DC bias problem, eliminating the current sharing control circuit, reducing the difficulty of supply chain and quality control, improving the product reliability, facilitating the tolerance design of the product, and also adapting to lower voltage and larger current power supply applications, thereby simplifying the circuit architecture of the power conversion unit of the energy storage device and improving the economy and reliability of the charging module integrated with the voltage conversion circuit 10.

[0040] In some embodiments, the difference between the first equivalent leakage inductance and the second equivalent leakage inductance is not greater than the product of the first equivalent leakage inductance and a set proportionality coefficient; and the set proportionality coefficient can be (-0.5) to (+0.5), and is preferably 0, that is, the first equivalent leakage inductance is equal to the second equivalent leakage inductance, so as to reduce the voltage drop difference on both sides of the first inductor sub-circuit 121 and the second inductor sub-circuit 122 as much as possible, thereby facilitating the passive current sharing, which is not limited in the present application.

[0041] In some embodiments, the first inductor sub-circuit 121 and the second inductor sub-circuit 122 can constitute a differential common-mode integrated inductor, and the main inductance common-mode component is used for passive current sharing; the differential mode component is leakage inductance, which is used for excitation and plays a role in energy storage and release, thereby being able to realize current sharing while effectively reducing the inductance usage, reducing the layout difference, inductance difference, and reducing the manufacturing and implementation cost and the occupied volume, thereby improving the product reliability, facilitating the tolerance design of the product, and also adapting to lower voltage and larger current power supply applications, thereby simplifying the circuit architecture of the power conversion unit of the energy storage device and improving the economy and reliability of the charging module integrated with the voltage conversion circuit 10; in addition, the inductance magnetic flux is bidirectionally utilized, and the leakage inductance is used as excitation inductance, which also effectively solves the magnetic bias problem.

[0042] Reference is made to Figure 2 , Figure 2 is a structural schematic diagram of a second embodiment of the voltage conversion circuit of the present application. The voltage conversion circuit in the present embodiment is different from the first embodiment of the voltage conversion circuit provided by the present application in that the first inductor sub-circuit 221 in the voltage conversion circuit 20 further comprises a first coil winding N1 and a first inductor Lr1, and the second inductor sub-circuit 222 further comprises a second coil winding N2 and a second inductor Lr2.

[0043] Specifically, a first end of the first coil winding N1 is coupled to the first switch sub-circuit 211 and the second switch sub-circuit 212, a second end of the first coil winding N1 is coupled to a first end of the second inductor Lr2, a second end of the second inductor Lr2 is coupled to a first end of the second coil winding N2 and the capacitor circuit 23, and is used to be coupled to a first end BAT+ of the post-working circuit 102, a second end of the second coil winding N2 is coupled to a first end of the second inductor Lr2, and a second end of the second inductor Lr2 is coupled to the first switch sub-circuit 211 and the second switch sub-circuit 212.

[0044] And the first coil winding N1 is coupled to the second coil winding N2, so that when one of the first coil winding N1 and the second coil winding N2 flows through an electric signal, the other one will induce a corresponding size of the electric signal, so as to realize energy transfer between different voltage sides.

[0045] Further, in some embodiments, a first inductor Lr1 value of the first inductor Lr1 can be specifically less than the first equivalent leakage inductance, and a second inductor Lr2 value of the second inductor Lr2 is less than the second equivalent leakage inductance, that is, the first coil winding N1 and the second coil winding N2 can specifically constitute a differential common mode integrated inductor LS1, and by configuring the first inductor Lr1 and the second inductor Lr2 as a supplement for use of excitation inductance, it is convenient to better realize the functions of energy storage and release.

[0046] And in other embodiments, the first inductor Lr1 value of the first inductor Lr1 can also be equal to the first equivalent leakage inductance, and the second inductor Lr2 value of the second inductor Lr2 is equal to the second equivalent leakage inductance, that is, the first coil winding N1 and the second coil winding N2 do not exist leakage inductance, but actually correspond to an isolation transformer, so as to realize passive current sharing by using the first coil winding N1 and the second coil winding N2, and realize excitation by using the first inductor Lr1 and the second inductor Lr2, so as to play a role of energy storage and release.

[0047] Further, in some embodiments, the difference between the first inductance Lr1 value and the second inductance Lr2 value is not greater than the product of the first inductance Lr1 value and a set proportionality coefficient; and the set proportionality coefficient can be specifically (-0.5)~(+0.5), and is preferably 0, that is, the first inductance Lr1 value and the second inductance Lr2 value are equal, so as to reduce the voltage drop difference on both sides of the first inductance sub-circuit 221 and the second inductance sub-circuit 222 as much as possible, thereby facilitating the realization of passive current sharing, which is not limited in the present application.

[0048] In an embodiment, the first switch sub-circuit 211 in the power switch circuit 21 specifically further includes a first switch tube QS1 and a fourth switch tube QS4, and the second switch sub-circuit 212 specifically further includes a second switch tube QS2 and a third switch tube QS3, a second end of the first switch tube QS1 is coupled to a second end of the second switch tube QS2 and is used to be coupled to a first end PV+ of the power supply circuit 101, a third end of the first switch tube QS1 is coupled to a second end of the third switch tube QS3 and a first end of the first coil winding N1, a third end of the second switch tube QS2 is coupled to a second end of the fourth switch tube QS4 and a second end of the second inductance Lr2, and a third end of the third switch tube QS3 is coupled to a third end of the fourth switch tube QS4 and is used to be coupled to a second end PV- of the power supply circuit 101 and a second end BAT- of the post-working circuit 102.

[0049] Further, in an embodiment, the voltage conversion circuit 20 specifically further includes a control circuit (not shown in the figure), which is coupled to the first end of each of the first switch tube QS1, the second switch tube QS2, the third switch tube QS3 and the fourth switch tube QS4.

[0050] The control circuit is used to synchronously send a first driving control signal PWM1 to the first switch tube QS1 and the fourth switch tube QS4 to trigger the first switch tube QS1 and the fourth switch tube QS4 to synchronously conduct or turn off, and correspondingly synchronously send a second driving control signal PWM2 to the second switch tube QS2 and the third switch tube QS3 to trigger the second switch tube QS2 and the third switch tube QS3 to synchronously conduct or turn off, so as to perform voltage regulation and conversion on the power supply input of the power supply circuit 101.

[0051] In some embodiments, the first switch tube QS1, the second switch tube QS2, the third switch tube QS3, the fourth switch tube QS4, and each "switch tube" in the following can be specifically one or a combination of any reasonable switch device such as MOS tube, high-frequency transistor, triode, thyristor, IGBT, etc., which is not limited in the present application.

[0052] And the first end of each switch tube in the present application corresponds to the control end, so that when the corresponding driving signal is received at the first end of each switch tube, the first end and the second end of the switch tube will be triggered to turn on or turn off under the action of the first driving control signal PWM1 or the second driving control signal PWM2.

[0053] In some embodiments, the control circuit can specifically include one of any reasonable circuit unit with signal processing function, such as control chip, MCU (Micro Controller Unit), CPU (Central Processing Unit), single-chip microcomputer, field programmable gate array, programmable logic device, discrete gate or transistor logic device, discrete hardware, etc., and the present application does not make any limitation in this regard.

[0054] In some embodiments, the capacitance circuit 23 can specifically further include a capacitance EC1, or any reasonable capacitive circuit unit formed by at least one capacitance EC1 and a resistance, and the present application does not make any limitation in this regard.

[0055] Please continue to refer to Figure 3 , Figure 4 and Figure 5 , wherein, Figure 3 is the schematic diagram of the electric signal flow direction of the power switch circuit in the voltage conversion circuit in Figure 2 , Figure 4 is the schematic diagram of the electric signal flow direction of the power switch circuit in the voltage conversion circuit in Figure 2 , Figure 5 is the schematic diagram of the electric signal flow direction of the power switch circuit in the voltage conversion circuit in Figure 2 .

[0056] It can be understood that in the current voltage conversion circuit 20, the first switch tube QS1 and the second switch tube QS2 represent the BUCK main power tube, i.e. the switch tube circuit; the third switch tube QS3 and the fourth switch tube QS4 represent the freewheeling power tube, i.e. the freewheeling switch tube circuit.

[0057] The first coil winding N1 and the second coil winding N2, the first inductance Lr1 and the second inductance Lr2 jointly constitute an integrated inductance circuit 22; wherein the first coil winding N1 and the second coil winding N2 are common mode components, and the first inductance Lr1 and the second inductance Lr2 are leakage inductances on both sides of the winding; and the integrated inductance circuit 22 can be a differential common mode integrated inductance LS1, and the first inductance Lr1 and the second inductance Lr2 can be understood as equivalent leakage inductances of the differential common mode integrated inductance LS1, which are actually integrated in the differential common mode integrated inductance LS1; in addition, the first inductance Lr1 and the second inductance Lr2 can also be understood as auxiliary excitation inductances independent of the differential common mode integrated inductance LS1; and the first coil winding N1 and the second coil winding N2 can also constitute an isolation transformer (not marked in the figure).

[0058] Wherein, the first switch tube QS1, the second switch tube QS2, the third switch tube QS3 and the fourth switch tube QS4 are controlled by the control circuit to correspondingly send the first control signal PWMA, the second control signal PWMB, the third control signal PWMC and the fourth control signal PWMD, and the first control signal PWMA and the fourth control signal PWMD correspond to the first drive control signal PWM1, and the second control signal PWMB and the third control signal PWMC correspond to the second drive control signal PWM2, and each has a first control state, a second control state and a third control state.

[0059] In the first control state, the current flow is as shown in Figure 3 : the first switch tube QS1 is turned on, the third switch tube QS3 is turned off, and the first inductance Lr1 stores energy; the second switch tube QS2 is turned off, the fourth switch tube QS4 is turned on, and the second inductance Lr2 releases energy.

[0060] In the second control state, the current flow is as shown in Figure 4 : the first switch tube QS1 is turned off, the third switch tube QS3 is turned off, and the first inductance Lr1 stops storing energy; the second switch tube QS2 is turned off, the third switch tube QS3 is turned off, and the second inductance Lr2 stops releasing energy; at this time, the first switch tube QS1, the second switch tube QS2, the third switch tube QS3 and the fourth switch tube QS4 are in a dead time, and no energy flows.

[0061] In the third control state, the current flow is as shown in Figure 5 : the first switch tube QS1 is turned off, the third switch tube QS3 is turned on, and the first inductance Lr1 releases energy; the second switch tube QS2 is turned on, the third switch tube QS3 is turned off, and the current second inductance Lr2 stores energy.

[0062] The control of the control circuit on the power switch circuit 21 corresponds to the first control state, the second control state, the third control state, and the cyclic repetition of the second control state, so that the energy is sequentially transferred from the high-voltage side to the low-voltage side.

[0063] Therefore, through the above scheme, even if there is a slight difference in the Layout circuit of the voltage conversion circuit 20 and / or there is a tolerance in the inductance on both sides of the integrated inductor circuit 22, when the voltage conversion circuit 20 is working, the first inductor Lr1 and the second inductor Lr2 will share the voltage drop difference, and ultimately achieve the current sharing effect.

[0064] Please refer to Figure 6 , Figure 6 is a structural schematic diagram of a third embodiment of the voltage conversion circuit of the present application. The voltage conversion circuit in this embodiment is different from the second embodiment of the voltage conversion circuit provided by the present application in that the number of the first switch sub-circuit 311, the second switch sub-circuit 312, the first inductor sub-circuit 321, and the second inductor sub-circuit 322 in the voltage conversion circuit 30 is equal and at least two.

[0065] Specifically, the second end of each first switch sub-circuit 311 in the power switch circuit 31 is used to be coupled with the first end PV+ of the power supply circuit 101, the third end of each second switch sub-circuit 312 is coupled with the second end of the capacitor circuit 33 and used to be coupled with the second end PV- of the power supply circuit 101, and the third end of each first switch sub-circuit 311 is coupled with the second end of one second switch sub-circuit 312 and the first end of one first inductor sub-circuit 321.

[0066] And each first inductor sub-circuit 321 in the integrated inductor circuit 32 is coupled with one second inductor sub-circuit 322, the second end of each first inductor sub-circuit 321 is coupled with the first end of each second inductor sub-circuit 322 and the first end of the capacitor circuit 33 and used to be coupled with the first end BAT+ of the post-work circuit 102, the second end of each second inductor sub-circuit 322 is coupled with the first end of another first inductor sub-circuit 321 which is not coupled with it, which can be understood as being sequentially connected in a head-to-tail manner, and the first end of each first inductor sub-circuit 321 is coupled with the second end of one second inductor sub-circuit 322.

[0067] In some embodiments, the capacitor circuit 33 can specifically include a capacitor EC1, and the number of the capacitor EC1 is one or more, which can be specifically less than or equal to the number of the first switch sub-circuit 311, that is, one capacitor EC1 can be specifically provided for each first switch sub-circuit 311, second switch sub-circuit 312, first inductor sub-circuit 321, and second inductor sub-circuit 322, or one capacitor EC1 can be shared by multiple circuits, which is not limited in the present application.

[0068] In some embodiments, the voltage conversion circuit 30 further comprises a control circuit (not shown in the figure), the first switch sub-circuit 311 comprises a fifth switch tube QS5, and the second switch sub-circuit 312 comprises a sixth switch tube QS6. The second end of each fifth switch tube QS5 is configured to be coupled to the first end PV+ of the power supply circuit 101. The third end of each sixth switch tube QS6 is coupled to the second end of the capacitor circuit 33 and configured to be coupled to the second end PV- of the power supply circuit 101 and the second end BAT- of the post-working circuit 102. The third end of each fifth switch tube QS5 is coupled to the second end of one sixth switch tube QS6 and the first end of one first inductor sub-circuit 321.

[0069] The control circuit is coupled to the first end of the fifth switch tube QS5 and the first end of the sixth switch tube QS6, configured to send a first driving control signal PWM1 to the fifth switch tube QS5 to trigger the fifth switch tube QS5 to turn on or turn off, and correspondingly send a second driving control signal PWM2 to the sixth switch tube QS6 to trigger the sixth switch tube QS6 to turn on or turn off, so as to perform voltage regulation and conversion on the power input of the power supply circuit 101.

[0070] It can be understood that in the present embodiment, the first inductor sub-circuit 321 and the second inductor sub-circuit 322 are the same as the first inductor sub-circuit 221 and the second inductor sub-circuit 222 respectively, and specific details can be referred to in Figures 2-5 and related text contents, which will not be repeated here.

[0071] The present application also adopts a signal function circuit, please refer to Figure 7 , Figure 7 is a structural schematic diagram of an embodiment of the signal function circuit of the present application. In the present embodiment, the signal function circuit 40 comprises a power supply circuit 41, a voltage conversion circuit 42, and a post-working circuit 43. The voltage conversion circuit 42 is coupled to the power supply circuit 41 and the post-working circuit 43.

[0072] It should be noted that the voltage conversion circuit 42 described in the present embodiment is any one of the voltage conversion circuit 10, the voltage conversion circuit 20, or the voltage conversion circuit 30 described in the above embodiments. Specific details can be referred to in Figures 1-6 and related text contents, which will not be repeated here.

[0073] The present application also adopts an electronic device, please refer to Figure 8 , Figure 8 is a structural schematic diagram of an embodiment of the electronic device of the present application. In the present embodiment, the electronic device 50 comprises a function integrated circuit 51.

[0074] Optionally, the electronic device 50 can be any reasonable electronic mechanical device such as a photovoltaic charging device, a mobile energy storage device, a server, a smart communication device, etc., and the present application does not limit it.

[0075] It should be noted that the function integrated circuit 51 described in the embodiment is the voltage conversion circuit 10, the voltage conversion circuit 20 or the voltage conversion circuit 30 described in any of the above embodiments, or the signal function circuit 40, please refer to Figures 1-7 and related text content, which will not be repeated here.

[0076] The beneficial effects of the present application are: unlike the prior art, the first switch subcircuit of the power switch circuit in the voltage conversion circuit provided by the present application is coupled to the second switch subcircuit and is used to be coupled to the power supply circuit, the first inductor subcircuit in the integrated inductor circuit is coupled to the first switch subcircuit and the second switch subcircuit, and is coupled to the second inductor subcircuit, the second inductor subcircuit is coupled to the first switch subcircuit and the second switch subcircuit; the first inductor subcircuit has a first equivalent leakage inductance, and the second inductor subcircuit has a second equivalent leakage inductance; the capacitor circuit is coupled to the first inductor subcircuit and the second inductor subcircuit, and is used to be coupled to the post-working circuit, so as to effectively realize the transfer and conversion of electric energy by the cooperation of the first equivalent leakage inductance, the second equivalent leakage inductance and the capacitor circuit, and also effectively realize the transfer of electric energy from the high-voltage side to the low-voltage side by the mutual coupling of the first inductor subcircuit and the second inductor subcircuit, thereby effectively solving the problem of direct current bias, saving the current sharing control circuit, reducing the difficulty of supply chain and quality control, improving the product reliability, facilitating the tolerance design of the product, and also being able to adapt to lower voltage and larger current power supply applications, thereby simplifying the circuit architecture of the power conversion unit of the energy storage device, and improving the economy and reliability of the charging module integrated with the voltage conversion circuit.

[0077] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A voltage conversion circuit, characterized in that: The voltage conversion circuit includes: a power switching circuit, comprising a first switching subcircuit and a second switching subcircuit, wherein the first switching subcircuit is coupled to the second switching subcircuit and is configured to couple to a power supply circuit; An integrated inductor circuit includes a first inductor subcircuit and a second inductor subcircuit, wherein the first inductor subcircuit is coupled to the first switch subcircuit and the second switch subcircuit and is coupled to the second inductor subcircuit, and the second inductor subcircuit is coupled to the first switch subcircuit and the second switch subcircuit; wherein the first inductor subcircuit has a first equivalent leakage inductance, and the second inductor subcircuit has a second equivalent leakage inductance; The capacitor circuit is coupled to the first inductor sub-circuit and the second inductor sub-circuit and is used to couple to a subsequent working circuit.

2. The voltage conversion circuit according to claim 1, wherein: The first inductor subcircuit includes a first coil winding and a first inductor, and the second inductor subcircuit includes a second coil winding and a second inductor. The first end of the first coil winding is coupled to the first switch subcircuit and the second switch subcircuit, the second end of the first coil winding is coupled to the first end of the second inductor, the second end of the second inductor is coupled to the first end of the second coil winding and the capacitor circuit, the second end of the second coil winding is coupled to the first end of the second inductor, and the second end of the second inductor is coupled to the first switch subcircuit and the second switch subcircuit. The first coil winding is coupled to the second coil winding.

3. The voltage conversion circuit according to claim 2, wherein: The first switch sub-circuit includes a first switch tube and a fourth switch tube, and the second switch sub-circuit includes a second switch tube and a third switch tube. The second end of the first switch tube is coupled to the second end of the second switch tube and is used to couple to the first end of the power supply circuit. The third end of the first switch tube is coupled to the second end of the third switch tube and the first end of the first coil winding. The third end of the second switch tube is coupled to the second end of the fourth switch tube and the second end of the second inductor. The third end of the third switch tube is coupled to the third end of the fourth switch tube and is used to couple to the second end of the power supply circuit.

4. The voltage conversion circuit according to claim 3, wherein: The voltage conversion circuit further includes a control circuit coupled to a first terminal of each of the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube; The control circuit is configured to synchronously send a first driving control signal to the first switching transistor and the fourth switching transistor, and synchronously send a second driving control signal to the second switching transistor and the third switching transistor.

5. The voltage conversion circuit according to claim 2, wherein: A first inductance value of the first inductor is equal to or smaller than the first equivalent leakage inductance, and a second inductance value of the second inductor is equal to or smaller than the second equivalent leakage inductance.

6. The voltage conversion circuit according to claim 1, wherein: The number of the first switch sub-circuit, the second switch sub-circuit, the first inductor sub-circuit, and the second inductor sub-circuit is equal and is at least two; The second end of each first switch subcircuit is used to couple with the first end of the power supply circuit, the third end of each second switch subcircuit is coupled with the second end of the capacitor circuit and is used to couple with the second end of the power supply circuit, the third end of each first switch subcircuit is coupled with the second end of a second switch subcircuit and a first end of a first inductor subcircuit, each first inductor subcircuit is coupled with a second inductor subcircuit, the second end of each first inductor subcircuit is coupled with the first end of each second inductor subcircuit and the first end of the capacitor circuit, the second end of each second inductor subcircuit is coupled with the first end of another first inductor subcircuit that is not coupled with it, and the first end of each first inductor subcircuit is coupled with the second end of a second inductor subcircuit.

7. The voltage conversion circuit according to claim 6, wherein: The voltage conversion circuit also includes a control circuit. The first switch sub-circuit includes a fifth switch tube, and the second switch sub-circuit includes a sixth switch tube. The second end of each of the fifth switch tubes is used to couple to the first end of the power supply circuit. The third end of each of the sixth switch tubes is coupled to the second end of the capacitor circuit and is used to couple to the second end of the power supply circuit. The third end of each of the fifth switch tubes is coupled to the second end of one of the sixth switch tubes and the first end of the first inductor sub-circuit. The control circuit couples the first end of the fifth switch tube and the first end of the sixth switch tube.

8. The voltage conversion circuit according to any one of claims 1 to 7, characterized in that: A difference between the first equivalent leakage inductance and the second equivalent leakage inductance is not greater than a product of the first equivalent leakage inductance and a set proportional coefficient.

9. A signal function circuit, characterized in that: The signal function circuit includes a power supply circuit, a voltage conversion circuit and a post-operation circuit, wherein the voltage conversion circuit is coupled to the power supply circuit and the post-operation circuit; Wherein, the voltage conversion circuit is the voltage conversion circuit according to any one of claims 1-8.

10. An electronic device, characterized in that: The electronic device includes a functional integrated circuit; Wherein, the functional integrated circuit is the voltage conversion circuit according to any one of claims 1 to 8, or the signal function circuit according to claim 9.

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