Buck-boost circuit, charge pump and electronic equipment

Abstract

The embodiment of the present application provides a buck-boost circuit, a charge pump and an electronic device, wherein the controller obtains the output voltage of the voltage power supply and the load voltage required by the load circuit, generates a first drive signal when detecting that the output voltage is greater than the load voltage, and sends the first drive signal to the buck circuit to drive the buck circuit to buck the output voltage until the preset buck threshold is reached, and then the load circuit is charged with the bucked output voltage; when the controller detects that the output voltage is less than the load circuit, a second drive signal is generated, and the second drive signal is sent to the boost circuit to drive the boost circuit to boost the output voltage until the preset boost threshold is reached, and the load circuit is charged with the boosted output voltage. The present application can utilize the charging and discharging characteristics of the capacitor to prevent the overall buck-boost circuit from emitting wireless signals during the buck-boost process, and avoid adverse effects on the circuit or the electronic device used.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boost and buck, and in particular to a boost and buck circuit, a charge pump and an electronic device. Background Art

[0002] As circuit systems become more complex, there are various requirements for power supply voltage, including boosting and stepping down. Common existing boost-boost circuits often require an inductor to store and release energy, and inductive boost-boost circuits are relatively mature in the prior art.

[0003] However, there is an inherent flaw in using inductors to design buck-boost circuits. Since the inductor itself is an antenna and can emit wireless signals, this will cause wireless interference to the internal components of the circuit. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a buck-boost circuit, a charge pump and an electronic device, which utilize the charging and discharging characteristics of capacitors to perform buck-boost and boost, thereby alleviating the technical problem in the prior art that using inductors for buck-boost may cause wireless interference to internal components.

[0005] In a first aspect, an embodiment of the present invention provides a buck-boost circuit, wherein the buck-boost circuit comprises: a controller, and a boost circuit, a buck circuit, a load circuit and a voltage power supply connected to the controller; the controller is used to obtain the output voltage of the voltage power supply and the load voltage required by the load circuit, and detect whether the output voltage is greater than the load voltage. If it is detected that the output voltage is greater than the load voltage, a first drive signal is generated, and the first drive signal is sent to the buck circuit to drive the buck circuit to step down the output voltage until a preset step-down threshold is reached, and the load circuit is charged with the stepped-down output voltage; the controller is also used to detect that the output voltage is less than the load circuit, generate a second drive signal, and send the second drive signal to the boost circuit to drive the boost circuit to step up the output voltage until a preset boost threshold is reached, and the load circuit is charged with the stepped-up output voltage.

[0006] The above-mentioned step-down circuit includes a first voltage detector and a first charging circuit connected to the first voltage detector; the first voltage detector is connected to the controller, and is used to receive a first drive signal, connect the voltage power supply to the first charging circuit based on the first drive signal to charge the first charging circuit, and detect whether the circuit voltage of the first charging circuit reaches a preset step-down threshold. If so, cut off the connection between the voltage power supply and the first charging circuit, and connect the first charging circuit to the load circuit for charging.

[0007] The above-mentioned first charging circuit includes a first charging capacitor, and a first switch, a second switch, and a first grounding switch driven and connected to the first voltage detector; wherein the positive electrode of the first charging capacitor is connected to both the first switch and the second switch, the negative electrode of the first charging capacitor is connected to the first grounding switch, the first switch is also connected to the voltage power supply, and the second switch is also connected to the load circuit; the first voltage detector is used to receive a first drive signal, generate a first drive instruction based on the first drive signal, send the first drive instruction to the first switch and the first grounding switch respectively, drive the first switch and the first grounding switch to close, so that the voltage power supply charges the first charging capacitor; the first voltage detector is also used to detect that the capacitor voltage of the first charging capacitor reaches a preset voltage reduction threshold, generate a second drive instruction, send the second drive instruction to the first switch, the first grounding switch, and the second switch respectively, drive the first switch to open, and drive the first grounding switch and the second switch to close, so that the first charging capacitor charges the load circuit.

[0008] The above-mentioned first charging circuit includes a second charging capacitor, and a third switch, a fourth switch, a fifth switch and a second grounding switch driven and connected to the first voltage detector; wherein, the positive electrode of the second charging capacitor is connected to both the third switch and the fourth switch, the negative electrode of the second charging capacitor is connected to the second grounding switch, the third switch and the fourth switch are also connected to the voltage power supply, and the fifth switch is also connected to the load circuit; the first voltage detector is used to receive the first drive signal, generate a third drive instruction based on the first drive signal, send the third drive instruction to the third switch and the second grounding switch respectively, drive the third switch and the second grounding switch to close, so that the voltage power supply charges the second charging capacitor; the first voltage detector is also used to detect that the capacitor voltage of the second charging capacitor reaches a preset voltage reduction threshold, generate a fourth drive instruction, send the fourth drive instruction to the third switch, the second grounding switch, the fourth switch and the fifth switch respectively, drive the third switch and the second grounding switch to open, and drive the fourth switch and the fifth switch to close, so that the second charging capacitor charges the load circuit.

[0009] The above-mentioned boost circuit includes a second voltage detector and a second charging circuit connected to the second voltage detector; the second voltage detector is connected to the controller, and is used to receive a second drive signal, connect the voltage power supply to the second charging circuit based on the second drive signal to charge the second charging circuit, and detect whether the circuit voltage of the second charging circuit reaches a preset boost threshold. If so, cut off the connection between the voltage power supply and the second charging circuit, and connect the second charging circuit and the voltage power supply to the load circuit for charging.

[0010] The above-mentioned second charging circuit includes a third charging capacitor, and a sixth switch, a seventh switch, an eighth switch and a third grounding switch driven and connected to the second voltage detector; wherein, the positive electrode of the third charging capacitor is connected to both the sixth switch and the seventh switch, the negative electrode of the third charging capacitor is connected to the third grounding switch, the sixth switch and the eighth switch are also connected to the voltage power supply, and the seventh switch is also connected to the load circuit; the second voltage detector is used to receive the second drive signal, generate a fifth drive instruction based on the second drive signal, send the fifth drive instruction to the sixth switch and the third grounding switch respectively, drive the sixth switch and the third grounding switch to close, so that the voltage power supply charges the third charging capacitor; the second voltage detector is also used to detect that the capacitor voltage of the third charging capacitor reaches a preset boost threshold, generate a sixth drive instruction, send the sixth drive instruction to the sixth switch, the seventh switch, the eighth switch and the third grounding switch respectively, drive the sixth switch and the third grounding switch to open, and drive the seventh switch and the eighth switch to close, so that the third charging capacitor and the voltage power supply are connected to the load circuit for charging.

[0011] The above-mentioned load circuit includes a third voltage detector and a charging load connected to the third voltage detector, and the third voltage detector is also communicatively connected to the first voltage detector and the second voltage detector; the third voltage detector is used to detect whether the voltage of the charging load reaches the load voltage, and if so, sends a detection signal to the first voltage detector or the second voltage detector, so that the first voltage detector cuts off the connection between the first charging circuit and the load circuit based on the detection signal, and reconnects the voltage power supply to the first charging circuit for charging, or so that the second voltage detector cuts off the connection between the second charging circuit and the load circuit based on the detection signal, and reconnects the voltage power supply to the second charging circuit for charging.

[0012] The charging load includes a grounded load and a fourth charging capacitor connected in parallel with the grounded load.

[0013] In a second aspect, an embodiment of the present invention further provides a charge pump, wherein the charge pump includes the above-mentioned buck-boost circuit.

[0014] In a third aspect, an embodiment of the present invention further provides an electronic device, wherein the electronic device includes the above-mentioned charge pump.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The embodiment of the present application provides a buck-boost circuit, a charge pump and an electronic device, wherein the controller obtains the output voltage of the voltage power supply and the load voltage required by the load circuit, and detects whether the output voltage is greater than the load voltage. If the output voltage is detected to be greater than the load voltage, a first drive signal is generated, and the first drive signal is sent to the buck circuit to drive the buck circuit to buck the output voltage until a preset buck threshold is reached, and the load circuit is charged with the output voltage after the buck; when the controller detects that the output voltage is less than the load circuit, a second drive signal is generated, and the second drive signal is sent to the boost circuit to drive the boost circuit to boost the output voltage until a preset boost threshold is reached, and the load circuit is charged with the output voltage after the boost. The present application can utilize the charge and discharge characteristics of the capacitor to prevent the overall buck-boost circuit from emitting wireless signals during the buck-boost process, and avoid adverse effects on the circuit or the electronic device used.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a buck-boost circuit provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a voltage-reducing circuit provided by an embodiment of the present invention;

[0022] Figure 3 A circuit diagram of a step-down circuit provided by an embodiment of the present invention;

[0023] Figure 4 A circuit diagram of another step-down circuit provided by an embodiment of the present invention;

[0024] Figure 5 A circuit diagram of a boost circuit provided by an embodiment of the present invention;

[0025] Figure 6 A circuit diagram of a load circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] Considering that after the existing buck-boost circuit uses the characteristics of inductance and is added to the circuit, the buck-boost circuit will generate wireless signals, which may affect the circuit or the electronic device to which the circuit is applied, and is not conducive to the overall operational stability of the circuit; based on this, a buck-boost circuit, a charge pump and an electronic device provided in an embodiment of the present invention can utilize the charging and discharging characteristics of the capacitor to enable the circuit to achieve the function of regulating the voltage across the load circuit during the buck-boost period, while avoiding wireless interference, effectively reducing the instability of the existing buck-boost circuit, thereby improving the operating accuracy of the electronic device.

[0028] This embodiment provides a buck-boost circuit, wherein Figure 1 A structural schematic diagram of a buck-boost circuit is shown in FIG. Figure 1 The buck-boost circuit includes: a controller 100, and a boost circuit 102, a buck circuit 104, a load circuit 106 and a voltage source 108 connected to the controller 100; the controller is used to obtain whether the output voltage obtains the output voltage of the voltage source and the load voltage required by the load circuit, and detects whether the output voltage is greater than the load voltage. If it is detected that the output voltage is greater than the load voltage, a first drive signal is generated, and the first drive signal is sent to the buck circuit to drive the buck circuit to step down the output voltage until a preset step-down threshold is reached, and the load circuit is charged using the stepped-down output voltage.

[0029] Due to the characteristics of the capacitor, it takes time for the voltage across the capacitor to build up. Therefore, a range can be selected to determine the preset step-down threshold so that the output voltage reaches the required voltage range. In this embodiment, the preset step-down threshold can be set to the difference between the actual detected voltage across the load and the power supply input voltage.

[0030] For example, through the above steps, the input voltage value obtained by the controller is 3V, and the output voltage value obtained by the controller is in the range of 3.8-4.2V, so the preset voltage reduction threshold is determined to be 0.8V-1.2V.

[0031] The controller is also used to detect that the output voltage is less than the load circuit, generate a second drive signal, and send the second drive signal to the boost circuit to drive the boost circuit to boost the output voltage until a preset boost threshold is reached, and use the boosted output voltage to charge the load circuit.

[0032] The preset boost threshold may also be a range selected to determine as the preset boost threshold so that the output voltage reaches the required voltage range. In this embodiment, the difference between the actually detected power input voltage and the output voltage may also be used as the preset boost threshold.

[0033] For example, through the above steps, the input voltage value obtained by the controller is 3V, and the output voltage value obtained by the controller is in the range of 2.2V-2.4V, so the determined preset boost threshold is 0.6V-0.8V.

[0034] The above-mentioned preset boost threshold and preset buck threshold can be determined according to the values ​​of the boost and buck components, and are not limited here.

[0035] The embodiment of the present application provides a step-up / step-down circuit. Figure 1 On the basis of Figure 2 A schematic diagram of a step-down circuit is shown in FIG. Figure 2 As shown, the voltage reduction circuit includes: a first voltage detector 200, and a first charging circuit 202 connected to the first voltage detector 200. The first voltage detector 200 is connected to the controller 100, and is used to receive a first driving signal, connect the voltage power supply 108 to the first charging circuit based on the first driving signal to charge the first charging circuit 202, and detect whether the circuit voltage of the first charging circuit 202 reaches a preset voltage reduction threshold. If so, the connection between the voltage power supply 108 and the first charging circuit is cut off, and the first charging circuit is connected to the load circuit for charging.

[0036] When the circuit is turned on, the voltage power supply supplies power to the load circuit, so that an output voltage is obtained at both ends of the load. When the voltage provided by the voltage power supply is higher than the voltage required by the load, the controller receives the first drive signal sent by the first voltage detector, and controls the voltage power supply to be connected to the first charging circuit so that the charging circuit is charged, and detects whether the voltage of the first charging circuit reaches the above-mentioned preset voltage reduction threshold. When the preset voltage reduction threshold is not reached, the first charging circuit continues to be charged until the preset voltage reduction threshold is reached. During this period, the first voltage detector detects the first charging circuit. When the voltage of the first charging circuit reaches the preset voltage reduction threshold, the charging of the first charging circuit is stopped. At this time, the connection between the voltage power supply and the first charging circuit is cut off, and the first charging circuit is connected to the load circuit for charging, so as to achieve the voltage reduction effect.

[0037] For ease of understanding, Figure 3 The circuit diagram of the above-mentioned step-down circuit is shown in FIG. Figure 3 As shown, the first charging circuit includes a first charging capacitor C1, and a first switch L1, a second switch L2, and a first grounding switch S1 driven and connected to the first voltage detector V1; wherein, the positive electrode of the first charging capacitor C1 is connected to both the first switch L1 and the second switch L2, the negative electrode of the first charging capacitor C1 is connected to the first grounding switch S1, the first switch L1 is also connected to the voltage power supply 108, and the second switch L2 is also connected to the load circuit 106.

[0038] The first voltage detector is used to receive the first drive signal, generate a first drive instruction based on the first drive signal, send the first drive instruction to the first switch and the first grounding switch respectively, drive the first switch and the first grounding switch to close, so that the voltage power supply charges the first charging capacitor. When the first detector detects that the capacitor voltage of the first charging capacitor reaches the preset voltage reduction threshold, it generates a second drive instruction, sends the second drive instruction to the first switch, the first grounding switch and the second switch respectively, drives the first switch to open, drives the first grounding switch and the second switch to close, so that the first charging capacitor charges the load circuit.

[0039] It can be seen from the above circuit that when the first switch and the first grounding switch are closed, the voltage power supply only directly charges the first charging capacitor. When the first detector detects that the capacitor voltage of the first charging capacitor reaches the above-mentioned preset voltage reduction threshold, the first switch is opened, and the first grounding switch and the second switch are closed. At this time, the load circuit is only powered by the first charging capacitor. Therefore, when the first charging circuit is used to reduce the voltage of the load, according to the characteristics of the capacitor, the minimum voltage provided by this circuit to the load circuit can be 0V, and the maximum voltage cannot reach the voltage value of the voltage power supply.

[0040] For ease of understanding, Figure 4 Another circuit diagram of the above-mentioned step-down circuit is shown, as Figure 4 As shown, the first charging circuit includes a second charging capacitor C2, and a third switch L3, a fourth switch L4, a fifth switch L5 and a second grounding switch S2 driven and connected to the first voltage detector; wherein the positive electrode of the second charging capacitor C2 is connected to both the third switch L3 and the fourth switch L4, the negative electrode of the second charging capacitor C2 is connected to the second grounding switch S2, the third switch L3 and the fourth switch L4 are also connected to the voltage power supply 108, and the fifth switch L5 is also connected to the load circuit 106.

[0041] The first voltage detector is used to receive the first drive signal, generate a third drive instruction based on the first drive signal, and send the third drive instruction to the third switch and the second grounding switch respectively, drive the third switch and the second grounding switch to close, so that the voltage power supply charges the second charging capacitor; when it is detected that the capacitor voltage of the second charging capacitor reaches a preset voltage reduction threshold, generate a fourth drive instruction, and send the fourth drive instruction to the third switch, the second grounding switch, the fourth switch and the fifth switch respectively, drive the third switch and the second grounding switch to open, and drive the fourth switch and the fifth switch to close, so that the second charging capacitor charges the load circuit.

[0042] It can be seen from the above circuit that when the third switch and the second grounding switch are closed, the voltage power supply only directly charges the first charging capacitor. When the first detector detects that the capacitor voltage of the first charging capacitor reaches the above-mentioned preset voltage reduction threshold, the third switch and the second grounding switch are opened, and the fourth switch and the fifth switch are closed. At this time, it is equivalent to reversely connecting the charged first charging capacitor to the voltage power supply to power the load circuit. Therefore, when using this first charging circuit to reduce the voltage of the load, according to the characteristics of the capacitor, the minimum voltage provided by this circuit to the load circuit cannot be 0V, and the maximum voltage can be the voltage value of the voltage power supply.

[0043] An embodiment of the present application also provides a buck-boost circuit, including a second voltage detector and a second charging circuit connected to the second voltage detector, wherein the second voltage detector is connected to a controller for receiving a second drive signal, connecting a voltage power supply to a second charging circuit based on the second drive signal to charge the second charging circuit, and detecting whether the circuit voltage of the second charging circuit reaches a preset boost threshold, and if so, cutting off the connection between the voltage power supply and the second charging circuit, and connecting the second charging circuit and the voltage power supply to a load circuit for charging.

[0044] The boost circuit includes a second voltage detector and a second charging circuit connected to the second voltage detector. The second voltage detector is connected to the controller and is used to receive a second drive signal, connect the voltage power supply to the second charging circuit based on the second drive signal to charge the second charging circuit, and detect whether the circuit voltage of the second charging circuit reaches a preset boost threshold. If so, cut off the connection between the voltage power supply and the second charging circuit, and connect the second charging circuit and the voltage power supply to the load circuit for charging.

[0045] For ease of understanding, Figure 5 A circuit diagram of a boost circuit is shown, such as Figure 5As shown, the second charging circuit includes a third charging capacitor C3, and a sixth switch L6, a seventh switch L7, an eighth switch L8 and a third grounding switch S3 driven and connected to the second voltage detector U2; wherein, the positive electrode of the third charging capacitor C3 is connected to both the sixth switch L6 and the seventh switch L7, the negative electrode of the third charging capacitor C3 is connected to the third grounding switch S3, the sixth switch L7 and the eighth switch L8 are also connected to the voltage power supply 108, and the seventh switch L7 is also connected to the load circuit.

[0046] The second voltage detector is used to receive the second drive signal, generate a fifth drive instruction based on the second drive signal, send the fifth drive instruction to the sixth switch and the third grounding switch respectively, drive the sixth switch and the third grounding switch to close, so that the voltage power supply charges the third charging capacitor. When it is detected that the capacitor voltage of the third charging capacitor reaches the preset boost threshold, a sixth drive instruction is generated, and the sixth drive instruction is sent to the sixth switch, the seventh switch, the eighth switch and the third grounding switch respectively, drive the sixth switch and the third grounding switch to open, and drive the seventh switch and the eighth switch to close, so that the third charging capacitor and the voltage power supply are connected to the load circuit for charging.

[0047] It can be seen from the above circuit that when the sixth switch and the third grounding switch are closed, the voltage power supply only directly charges the first charging capacitor. When the first detector detects that the capacitor voltage of the first charging capacitor reaches the above-mentioned preset boost threshold, the sixth switch and the third grounding switch are opened, and the seventh switch and the eighth switch are closed. At this time, it is equivalent to connecting the charged third charging capacitor forward to the voltage power supply to power the load circuit. Therefore, when using this second charging circuit to boost the load, according to the characteristics of the capacitor, the minimum voltage provided by this circuit to the load circuit is not lower than the voltage of the voltage power supply, and the maximum voltage is below twice the voltage value of the voltage power supply.

[0048] The load circuit includes a third voltage detector and a charging load connected to the third voltage detector, and the third voltage detector is also communicatively connected to the first voltage detector and the second voltage detector; the third voltage detector is used to detect whether the voltage of the charging load reaches the load voltage, and if so, sends a detection signal to the first voltage detector or the second voltage detector, so that the first voltage detector cuts off the connection between the first charging circuit and the load circuit based on the detection signal, and reconnects the voltage power supply to the first charging circuit for charging, or so that the second voltage detector cuts off the connection between the second charging circuit and the load circuit based on the detection signal, and reconnects the voltage power supply to the second charging circuit for charging.

[0049] The charging load includes a grounded load and a fourth charging capacitor connected in parallel with the grounded load. Figure 6 A circuit diagram of a load circuit is shown, such as Figure 6 As shown, the grounded load R, the fourth charging capacitor C4 and the third voltage detector U3 are all connected in parallel.

[0050] Corresponding to the above-mentioned buck-boost circuit embodiment, an embodiment of the present invention provides a charge pump, including all the above-mentioned buck-boost circuits.

[0051] Corresponding to the above buck-boost circuit embodiment, the present invention provides an electronic device, which includes the above buck-boost circuit. The above electronic device can be any device that needs to boost or reduce voltage, and is not limited here.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The electronic device and charge pump provided in the embodiments of the present invention have the same technical features as the buck-boost circuit provided in the above embodiments, and therefore can solve the same technical problems and achieve the same technical effects.

[0054] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0056] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0057] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A step-up / step-down circuit, characterized in that: The buck-boost circuit comprises: a controller, and a boost circuit, a buck circuit, a load circuit and a voltage power supply connected to the controller; The controller is used to obtain the output voltage of the voltage power supply and the load voltage required by the load circuit, and detect whether the output voltage is greater than the load voltage. If it is detected that the output voltage is greater than the load voltage, a first drive signal is generated, and the first drive signal is sent to the step-down circuit to drive the step-down circuit to step down the output voltage until a preset step-down threshold is reached, and the load circuit is charged using the stepped-down output voltage; The controller is further configured to detect that the output voltage is lower than the load circuit, generate a second drive signal, and send the second drive signal to the boost circuit to drive the boost circuit to boost the output voltage until a preset boost threshold is reached, and charge the load circuit using the boosted output voltage; The boost circuit includes a second voltage detector, and a second charging circuit connected to the second voltage detector; The second voltage detector is connected to the controller and is used to receive the second drive signal, connect the voltage power supply to the second charging circuit based on the second drive signal to charge the second charging circuit, and detect whether the circuit voltage of the second charging circuit reaches the preset boost threshold. If yes, cut off the connection between the voltage power supply and the second charging circuit, and connect the second charging circuit and the voltage power supply to the load circuit for charging; The second charging circuit includes a third charging capacitor, and a sixth switch, a seventh switch, an eighth switch and a third grounding switch drivingly connected to the second voltage detector; wherein the positive electrode of the third charging capacitor is connected to both the sixth switch and the seventh switch, the negative electrode of the third charging capacitor is connected to the third grounding switch, the sixth switch and the eighth switch are also connected to the voltage power supply, and the seventh switch is also connected to the load circuit; The second voltage detector is used to receive the second drive signal, generate a fifth drive instruction based on the second drive signal, and send the fifth drive instruction to the sixth switch and the third grounding switch respectively to drive the sixth switch and the third grounding switch to close, so that the voltage power supply charges the third charging capacitor; The second voltage detector is also used to detect that the capacitor voltage of the third charging capacitor reaches the preset boost threshold, generate a sixth drive instruction, and send the sixth drive instruction to the sixth switch, the seventh switch, the eighth switch and the third grounding switch respectively, drive the sixth switch and the third grounding switch to open, and drive the seventh switch and the eighth switch to close, so that the third charging capacitor and the voltage power supply are connected to the load circuit for charging.

2. The step-up / down voltage circuit according to claim 1, characterized in that: The step-down circuit includes a first voltage detector, and a first charging circuit connected to the first voltage detector; The first voltage detector is connected to the controller and is used to receive the first drive signal, connect the voltage power supply to the first charging circuit based on the first drive signal to charge the first charging circuit, and detect whether the circuit voltage of the first charging circuit reaches the preset voltage reduction threshold. If so, cut off the connection between the voltage power supply and the first charging circuit, and connect the first charging circuit to the load circuit for charging.

3. The step-up / down voltage circuit according to claim 2, characterized in that: The first charging circuit includes a first charging capacitor, and a first switch, a second switch, and a first grounding switch drivingly connected to the first voltage detector; wherein the positive electrode of the first charging capacitor is connected to both the first switch and the second switch, the negative electrode of the first charging capacitor is connected to the first grounding switch, the first switch is also connected to the voltage power supply, and the second switch is also connected to the load circuit; The first voltage detector is used to receive the first drive signal, generate a first drive instruction based on the first drive signal, and send the first drive instruction to the first switch and the first grounding switch respectively to drive the first switch and the first grounding switch to close, so that the voltage power supply charges the first charging capacitor; The first voltage detector is further used to detect that the capacitor voltage of the first charging capacitor reaches the preset voltage reduction threshold, generate a second drive instruction, and send the second drive instruction to the first switch, the first grounding switch and the second switch respectively, drive the first switch to open, and drive the first grounding switch and the second switch to close, so that the first charging capacitor charges the load circuit.

4. The step-up / down voltage circuit according to claim 2, characterized in that: The first charging circuit includes a second charging capacitor, and a third switch, a fourth switch, a fifth switch, and a second grounding switch driven and connected to the first voltage detector; wherein the positive electrode of the second charging capacitor is connected to both the third switch and the fourth switch, the negative electrode of the second charging capacitor is connected to the second grounding switch, the third switch and the fourth switch are also connected to the voltage power supply, and the fifth switch is also connected to the load circuit; The first voltage detector is used to receive the first drive signal, generate a third drive instruction based on the first drive signal, and send the third drive instruction to the third switch and the second grounding switch respectively to drive the third switch and the second grounding switch to close, so that the voltage power supply charges the second charging capacitor; The first voltage detector is further used to detect that the capacitor voltage of the second charging capacitor reaches the preset voltage reduction threshold, generate a fourth driving instruction, and send the fourth driving instruction to the third switch, the second grounding switch, the fourth switch and the fifth switch respectively, drive the third switch and the second grounding switch to open, and drive the fourth switch and the fifth switch to close, so that the second charging capacitor charges the load circuit.

5. The step-up / down voltage circuit according to claim 2, characterized in that: The load circuit includes a third voltage detector and a charging load connected to the third voltage detector, and the third voltage detector is also communicatively connected to the first voltage detector and the second voltage detector; The third voltage detector is used to detect whether the voltage of the charging load reaches the load voltage. If so, a detection signal is sent to the first voltage detector or the second voltage detector, so that the first voltage detector cuts off the connection between the first charging circuit and the load circuit based on the detection signal, and reconnects the voltage power supply to the first charging circuit for charging, or so that the second voltage detector cuts off the connection between the second charging circuit and the load circuit based on the detection signal, and reconnects the voltage power supply to the second charging circuit for charging.

6. The step-up / down voltage circuit according to claim 5, characterized in that: The charging load includes a grounded load and a fourth charging capacitor connected in parallel with the grounded load.

7. A charge pump, characterized in that: The charge pump comprises the buck-boost circuit according to any one of claims 1 to 6.

8. An electronic device, characterized in that: The electronic device comprises the charge pump according to claim 7.

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