BUCK converter and electronic equipment

Abstract

The embodiment of the invention provides a BUCK converter and electronic equipment, and relates to the technical field of BUCK converters. The BUCK converter is used for the electronic equipment. The electronic equipment comprises a silicon negative electrode battery and a load, and the silicon negative electrode battery is electrically connected with the load through a BUCK converter. The BUCK converter comprises a first switch tube, a second switch tube and an energy storage element. The first end of the first switch tube is electrically connected with the silicon cathode battery, the second end of the first switch tube is electrically connected with the first end of the energy storage element and the first end of the second switch tube, and the second end of the energy storage element is electrically connected with the second end of the second switch tube. The first switch tube and the second switch tube are used for controlling charging or discharging of the energy storage element. Wherein the first switch tube and the second switch tube are both N-channel metal-oxide semiconductor field effect transistors. Through the arrangement, the conduction impedance of the first switch tube and the second switch tube can be reduced, so that the loss of the BUCK converter is reduced, and particularly, the loss of the BUCK converter when the output voltage of the silicon cathode battery is relatively low is reduced.

Description

BUCK converter and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 11, 2023, with application number 202322730781.7 and application name “BUCK converter and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the technical field of BUCK converters, and in particular to a BUCK converter and an electronic device. Background Art

[0003] In related art, electronic devices generally include a buck converter for implementing DC-DC step-down conversion. However, the buck converter suffers from high losses, which affects the performance of the buck converter.

[0004] Summary of the Invention

[0005] Embodiments of the present application provide a BUCK converter and an electronic device for reducing the on-resistance of a switch tube in the BUCK converter, thereby reducing the loss of the BUCK converter.

[0006] On the one hand, an embodiment of the present application provides a BUCK converter. The BUCK converter is used for an electronic device. The electronic device includes a silicon negative electrode battery and a load, the silicon negative electrode battery is electrically connected to the input end of the BUCK converter, and the output end of the BUCK converter is electrically connected to the load. The BUCK converter includes a first switching tube, a second switching tube and an energy storage element. The first end of the first switching tube is electrically connected to the silicon negative electrode battery, the second end of the first switching tube is electrically connected to the first end of the energy storage element and the first end of the second switching tube, and the second end of the energy storage element is electrically connected to the second end of the second switching tube. The energy storage element is electrically connected to the load, and the first switching tube and the second switching tube are used to control the charging or discharging of the energy storage element. Wherein, the first switching tube and the second switching tube are both N-channel metal-oxide semiconductor field effect transistors.

[0007] In the embodiments of the present application, both the first and second switching transistors are configured as N-channel metal-oxide semiconductor field-effect transistors. N-channel metal-oxide semiconductor field-effect transistors have a lower on-resistance. Compared to the prior art method in which the first switching transistor is configured as a P-channel metal-oxide semiconductor field-effect transistor, this reduces the losses and heat dissipation of the buck converter. This is particularly true when the output voltage of the silicon cathode battery is low and the current flowing through the buck converter is high, thereby reducing the losses and heat dissipation of the buck converter and improving the circuit efficiency of the buck converter. Furthermore, the higher switching efficiency of N-channel metal-oxide semiconductor field-effect transistors can improve the switching efficiency of the switching transistors (including the first and second switching transistors), thereby enhancing the performance of the buck converter.

[0008] In some possible implementations, the buck converter further includes a control device, wherein a first output terminal of the control device is electrically connected to the control terminal of the first switching transistor, and a second output terminal of the control device is electrically connected to the control terminal of the second switching transistor. This configuration enables the control device to control the on / off switching of the first switching transistor and the on / off switching of the second switching transistor, thereby enabling the first switching transistor and the second switching transistor to control the charging or discharging of the energy storage element.

[0009] In some possible implementations, the buck converter further includes a buck power supply electrically connected to a power input terminal of the control device. This configuration enables the buck power supply to power the control device, thereby enabling the control device to control the on / off switching of the first and second switching devices.

[0010] In some possible implementations, the buck converter further includes a drive circuit electrically connected to the buck power supply and a control device. The buck power supply provides a drive voltage to the control device via the drive circuit. This configuration enables the control device to provide a drive voltage to the control terminals of the switching transistors (including the first switching transistor and the second switching transistor) to control the switching transistors (including the first switching transistor and the second switching transistor) to conduct.

[0011] In some possible implementations, the output voltage of the buck power supply is greater than the output voltage of the silicon anode battery. This configuration enables the buck power supply to provide a high-level voltage to the control device, thereby enabling the control device to control the switching transistors (including the first switching transistor and the second switching transistor) to conduct.

[0012] In some possible implementations, the drive circuit includes a diode and a second capacitor. The anode of the diode is electrically connected to the BUCK power supply, the cathode of the diode is electrically connected to the drive input terminal of the control device and the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the second end of the first switch tube. This configuration enables the BUCK power supply to provide a high-level drive voltage to the control device, thereby enabling the control device to provide a high-level drive voltage to the control end of the switch tube (including the first switch tube and the second switch tube), so that the control device can control the switch tube (including the first switch tube and the second switch tube) to turn on. In addition, the risk of current flowing in the direction from the second capacitor to the diode is reduced, thereby improving the reliability of the BUCK converter.

[0013] In some possible implementations, the buck converter further includes a first capacitor. A first end of the first capacitor is electrically connected to the second end of the energy storage element and the first end of the load, and a second end of the first capacitor is electrically connected to the second end of the load and the second end of the second switching transistor. This arrangement enables the first capacitor to provide voltage stabilization, thereby improving the stability of the buck converter's output voltage.

[0014] In some possible implementations, the energy storage element includes an inductor. This configuration enables the silicon negative electrode battery to charge the inductor and the inductor to discharge to the load, resulting in a simple structure and reduced cost of the buck converter.

[0015] In another aspect, an embodiment of the present application provides an electronic device. The electronic device includes a silicon anode battery, a buck converter (BUCK) converter, and a load. The silicon anode battery is electrically connected to an input of the buck converter, and an output of the buck converter is electrically connected to the load.

[0016] The electronic device provided in the embodiment of the present application includes the BUCK converter as described above, and therefore has all the beneficial effects of the BUCK converter described above, which will not be described in detail here.

[0017] In some possible implementations, the minimum operating voltage of the silicon negative electrode battery is less than 3.2 V. Compared to setting the output voltage of the silicon negative electrode battery to be greater than or equal to 3.2 V, this configuration enables the silicon negative electrode battery to provide more power to the load, thereby extending the standby time of the electronic device and improving the performance of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of an electronic device provided in some embodiments of the present application.

[0019] FIG2 is a schematic diagram of the connection relationship of electronic devices provided in some embodiments of the present application.

[0020] FIG3 is a schematic diagram of a circuit topology of a BUCK converter provided in some embodiments of the present application.

[0021] FIG4 is a schematic diagram of a circuit topology of a BUCK converter provided in some other embodiments of the present application.

[0022] FIG5 is a schematic diagram of a circuit topology of a BUCK converter provided in some other embodiments of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present application. Obviously, the embodiments described are only some embodiments of the present application, not all embodiments. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0024] Unless the context requires otherwise, throughout the specification and claims, the term "including" and its other forms, such as the third person singular form "including" and the present participle form "including", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that the specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0025] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0026] Figure 1 is a schematic diagram of the structure of an electronic device provided in some embodiments of the present application. Figure 2 is a schematic diagram of the connection relationship of the electronic device provided in some embodiments of the present application.

[0027] As shown in FIG1 , an embodiment of the present application provides an electronic device 200. For example, the electronic device 200 may be a terminal device, such as a mobile phone, a tablet computer, a smart bracelet, etc. It is understandable that the embodiment of the present application does not further limit the type of the electronic device 200.

[0028] In some examples, as shown in FIG2 , electronic device 200 may include a silicon anode battery 210, a buck (buck circuit) converter 100, and a load 220. Specifically, buck converter 100 may be used in electronic device 200. Silicon anode battery 210 is electrically connected to input terminal 100a of buck converter 100. Output terminal 100b of buck converter 100 is electrically connected to load 220.

[0029] The silicon negative electrode battery 210 is a lithium battery whose negative electrode material is silicon. The silicon negative electrode battery 210 is electrically connected to the input terminal 100a of the buck converter 100, so that the silicon negative electrode battery 210 can output direct current (DC) to the buck converter 100. For example, the silicon negative electrode battery 210 can output DC power of approximately 4V (unit: volts) to the buck converter 100, or the silicon negative electrode battery 210 can also output DC power of other voltage values ​​to the buck converter 100. It is understandable that as the electrical energy stored in the silicon negative electrode battery 210 continues to decrease, the battery voltage (VBAT) of the silicon negative electrode battery 210 will gradually decrease.

[0030] The BUCK converter 100 is capable of performing direct current (DC) step-down conversion. That is, the BUCK converter 100 is capable of stepping down the DC voltage from the silicon negative electrode battery 210. The output terminal 100b of the BUCK converter 100 is electrically connected to the load 220, so that the BUCK converter 100 can provide the DC power after the voltage reduction process to the load 220 to meet the working requirements of the load 220. For example, the BUCK converter 100 can provide a DC power of about 3V to the load 220, or the BUCK converter 100 can also provide a DC power of other voltage values ​​to the load 220. It can be understood that the embodiments of the present application do not further limit the value of the output voltage of the silicon negative electrode battery 210 and the value of the DC voltage provided by the BUCK converter 100 to the load 220.

[0031] For example, when the power of the load 220 changes, the operating voltage of the load 220 will also change. The output voltage of the BUCK converter 100 can change with the change of the operating voltage of the load 220, so that the load 220 can operate normally.

[0032] In some examples, load 220 may include devices such as a display screen, audio, radio frequency, or system-on-chip (SOC). A system-on-chip may include chips such as a central processing unit (CPU), a graphics processing unit (GPU), or a memory chip. There may be multiple loads 220, and the types of the multiple loads 220 may be the same or different.

[0033] When there are multiple loads 220 , the operating voltages of the multiple loads 220 may be the same or different. When the operating voltages of the multiple loads 220 are different, there may be multiple buck converters 100 . One buck converter 100 may provide an operating voltage for one load 220 , or one buck converter 100 may provide an operating voltage for at least two loads 220 with the same operating voltage, thereby meeting the operating requirements of the multiple loads 220 .

[0034] In some examples, the lowest operating voltage of the silicon anode battery 210 is less than 3.2V.

[0035] It is understood that the minimum operating voltage of the silicon negative electrode battery 210 is also the minimum voltage at which the silicon negative electrode battery 210 can operate. When the battery voltage of the silicon negative electrode battery 210 is greater than or equal to the minimum operating voltage of the silicon negative electrode battery 210, the power provided by the silicon negative electrode battery 210 can meet the operating requirements of the load 220, and the electronic device 200 can operate normally. Conversely, when the battery voltage of the silicon negative electrode battery 210 is less than the minimum operating voltage of the silicon negative electrode battery 210, the power provided by the silicon negative electrode battery 210 cannot meet the operating requirements of the load 220, and the electronic device 200 is in a shutdown state.

[0036] In this way, setting the minimum operating voltage of the silicon negative electrode battery 210 to be less than 3.2V, compared to setting the output voltage of the silicon negative electrode battery 210 to be greater than or equal to 3.2V, enables the silicon negative electrode battery 210 to provide more power to the load 220, thereby extending the standby time of the electronic device 200 and improving the performance of the electronic device 200.

[0037] In some examples, other functional circuits (such as a boost circuit) may be added to reduce the minimum operating voltage of the silicon negative electrode battery 210 to less than 3.2V.

[0038] For example, the lowest operating voltage of the silicon negative electrode battery 210 may be 3.0V, 2.8V, 2.5V, or 2.3V.

[0039] Figure 3 is a schematic diagram of the circuit topology of a buck converter provided in some embodiments of the present application. Figure 4 is a schematic diagram of the circuit topology of a buck converter provided in other embodiments of the present application. The difference between Figures 3 and 4 is that different current flows are indicated by arrows in different directions. The following describes the circuit structure of a buck converter 100 in some implementations of the present application with reference to Figures 3 and 4.

[0040] In some examples, as shown in Figures 3 and 4, the buck converter 100 may include a first switching transistor Q1, a second switching transistor Q2, and an energy storage element 110. The first terminal Q11 of the first switching transistor Q1 is electrically connected to the silicon negative electrode battery 210, the second terminal Q12 of the first switching transistor Q1 is electrically connected to the first terminal Q21 of the energy storage element 110 and the first terminal Q22 of the second switching transistor Q2, and the second terminal Q22 of the energy storage element 110 is electrically connected to the second terminal Q22 of the second switching transistor Q2. For example, after the second terminal Q22 of the energy storage element 110 is electrically connected to the second terminal Q22 of the second switching transistor Q2, it can be electrically connected to the ground terminal GND. As shown in Figures 3 and 4, the energy storage element 110 is electrically connected to the load 220. It can be understood that the first switching transistor Q1 and the second switching transistor Q2 are used to control the charging or discharging of the energy storage element 110.

[0041] For example, the first switching transistor Q1 and the second switching transistor Q2 may be metal-oxide-semiconductor field-effect transistors (MOSFETs). One of the first end Q11 of the first switching transistor Q1 and the second end Q12 of the first switching transistor Q1 serves as the source of the MOSFET, and the other serves as the drain of the MOSFET. One of the first end Q21 of the second switching transistor Q2 and the second end Q22 of the second switching transistor Q2 serves as the source of the MOSFET, and the other serves as the drain of the MOSFET.

[0042] It is understood that the first switch Q1 and the second switch Q2 can be turned on alternately to charge or discharge the energy storage element 110. The energy storage element 110 is electrically connected to the load 220, so that the buck converter 100 can provide a stable DC voltage to the load 220.

[0043] For example, when the first switch Q1 is on and the second switch Q2 is off, as indicated by the direction of arrow g1 in FIG3 , current can flow along the silicon negative battery 210, the first switch Q1, the energy storage element 110, the load 220, and the ground terminal GND, allowing the silicon negative battery 210 to charge the energy storage element 110 via the first switch Q1 and to supply power to the load 220 via the first switch Q1. When the first switch Q1 is off and the second switch Q2 is on, as indicated by the direction of arrow g2 in FIG4 , current can flow along the energy storage element 110, the load 220, and the second switch Q2, discharging the energy storage element 110 and supplying power to the load 220.

[0044] It can be understood that by controlling the on-time of the first switch Q1, the output voltage of the buck converter 100 can be controlled. The longer the on-time of the first switch Q1, the higher the output voltage of the buck converter 100; the shorter the on-time of the first switch Q1, the lower the output voltage of the buck converter 100.

[0045] In some examples, as shown in Figures 3 and 4 , the buck converter 100 may further include a first capacitor C1. A first end C11 of the first capacitor C1 is electrically connected to the second end of the energy storage element 110 and the first end 220a of the load 220. A second end C12 of the first capacitor C1 is electrically connected to the second end 220b of the load 220 and the second end Q22 of the second switch Q2. In other words, the energy storage element 110 is electrically connected to the load 220 via the first capacitor C1, and the first capacitor C1 and the load 220 are connected in parallel.

[0046] For example, when the first switch tube Q1 is turned on, the silicon negative electrode battery 210 can supply power to the energy storage element 110, the first capacitor C1, and the load 220; when the first switch tube Q1 is turned off, the energy storage element 110 can charge the first capacitor C1. In this way, the voltage across the first capacitor C1 can remain stable or approximately stable. Since the first capacitor C1 is connected in parallel with the load 220, the BUCK converter 100 can provide a stable DC voltage to the load 220. It can be understood that the voltage across the first capacitor C1 is less than the output voltage of the silicon negative electrode battery 210, so that the BUCK converter 100 can achieve DC-DC step-down conversion.

[0047] That is, by adopting the above configuration, the first capacitor C1 can play a role in voltage stabilization, thereby improving the stability of the output voltage of the BUCK converter 100 .

[0048] In some examples, the first capacitor C1 may be a ceramic capacitor (full name: Multi-layer Ceramic Capacitors, English abbreviation: MLCC).

[0049] In some examples, as shown in FIG. 3 and FIG. 4 , the energy storage element 110 includes an inductor L.

[0050] Such an arrangement enables the silicon negative electrode battery 210 to charge the inductor L and enables the inductor L to discharge to the load 220 , which simplifies the structure and reduces the cost of the BUCK converter 100 .

[0051] In some implementations, the first switch tube Q1 is an N-channel MOSFET (abbreviated as N MOS), and the second switch tube Q2 is a P-channel MOSFET (abbreviated as P MOS).

[0052] The inventors of this application discovered that the relatively large on-resistance of the PMOS leads to high heat dissipation, resulting in high losses and heat generation in the buck converter 100. When the output voltage of the silicon cathode battery 210 is low, the input voltage of the buck converter 100 decreases. While the load 220 operating power remains unchanged, the current flowing through the buck converter 100 increases. This further increases the losses and heat dissipation of the PMOS, exacerbating the high losses and heat generation issues in the buck converter 100. Furthermore, the slow switching speed of the PMOS affects the performance of the buck converter 100.

[0053] FIG5 is a schematic diagram of a circuit topology of a BUCK converter provided in some other embodiments of the present application.

[0054] Based on this, as shown in FIG5 , an embodiment of the present application provides a buck converter 100. Buck converter 100 may include a first switching transistor Q1, a second switching transistor Q2, and an energy storage element 110. A first terminal Q11 of the first switching transistor Q1 is electrically connected to a silicon negative battery 210, a second terminal Q12 of the first switching transistor Q1 is electrically connected to a first terminal Q21 of the energy storage element 110, and a second terminal Q22 of the second switching transistor Q2. The second terminal Q22 of the energy storage element 110 is electrically connected to a second terminal Q22 of the second switching transistor Q2. The first switching transistor Q1 and the second switching transistor Q2 are used to control the charging or discharging of the energy storage element 110.

[0055] The embodiments corresponding to FIG. 3 and FIG. 4 of the present application have already provided examples for illustrating the first switch tube Q1 , the second switch tube Q2 , and the energy storage element 110 , and will not be repeated here.

[0056] In some examples, as shown in FIG5 , the first switch transistor Q1 and the second switch transistor Q2 are both N-channel metal-oxide semiconductor field-effect transistors.

[0057] As can be understood, configuring both the first switch Q1 and the second switch Q2 to be N-channel metal-oxide semiconductor field-effect transistors (MOSFETs), which have a lower on-resistance, can reduce losses and heat dissipation in the buck converter 100 compared to configuring the first switch Q1 to be a P-channel MOSFET in related art. This can particularly reduce losses and heat dissipation in the buck converter 100 when the output voltage of the silicon cathode battery 210 is low and the current flowing through the buck converter 100 is high, thereby improving the circuit efficiency of the buck converter 100. Furthermore, the higher switching efficiency of N-channel metal-oxide semiconductor field-effect transistors can improve the switching efficiency of the switches (including the first switch Q1 and the second switch Q2), thereby enhancing the performance of the buck converter 100.

[0058] In some examples, as shown in FIG5 , the buck converter 100 further includes a control device 120. For example, the control device 120 may include a control circuit or a drive circuit. A first output terminal 120 a of the control device 120 is electrically connected to a control terminal Q13 of the first switch Q1, and a second output terminal 120 b of the control device 120 is electrically connected to a control terminal Q23 of the second switch Q2.

[0059] For example, the first terminal Q11 of the first switch transistor Q1 can be the source of an N-channel MOSFET, the second terminal Q12 of the first switch transistor Q1 can be the drain of the N-channel MOSFET, and the control terminal Q13 of the first switch transistor Q1 can be the gate of the N-channel MOSFET. The first terminal Q21 of the second switch transistor Q2 can be the source of an N-channel MOSFET, the second terminal Q22 of the second switch transistor Q2 can be the drain of the N-channel MOSFET, and the control terminal Q23 of the second switch transistor Q2 can be the gate of the N-channel MOSFET.

[0060] As shown in Figure 5, the first output terminal 120a of the control device 120 is electrically connected to the control terminal Q13 of the first switch Q1, allowing the control device 120 to control the conduction or disconnection of the first switch Q1. The second output terminal 120b of the control device 120 is electrically connected to the control terminal Q23 of the second switch Q2, allowing the control device 120 to control the conduction or disconnection of the second switch Q2. In this way, the first switch Q1 and the second switch Q2 can control the charging or discharging of the energy storage element 110 (inductor L).

[0061] In some examples, the control device 120 can send a first control signal to the control terminal Q13 of the first switch transistor Q1 to control the conduction or disconnection of the first switch transistor Q1. Furthermore, the control device 120 can send a second control signal to the control terminal Q23 of the second switch transistor Q2 to control the conduction or disconnection of the second switch transistor Q2. For example, the first control signal and the second control signal can be pulse signals.

[0062] The following describes the control logic of the control device 120 on the first switch Q1 and the second switch Q2 in some implementations of the present application.

[0063] For example, the input voltage of the buck converter 100 (i.e., the output voltage of the silicon anode battery 210) is Vin, in V; the battery voltage of the silicon anode battery 210 is VBAT, in V; the maximum current flowing through the buck converter 100 is I, in A (amperes); the impedance of the buck converter 100 is R, in Ω (ohms); the reserved safety voltage is δV, in V; and the undervoltage point reserve voltage is βV, in V. The operating voltage of the load 220 in steady-state operation is Va, in V; and the minimum voltage at which the load 220 can operate normally is Va-Vb, where Vb is a positive number, in V.

[0064] It is understood that the reserved safety voltage δV is a positive number and can vary with the operating state of the load 220. For example, the reserved safety voltage δV can be equal to VBAT - IR - Va. That is, the reserved safety voltage is set based on the difference between VBAT and IR.

[0065] The undervoltage reserve voltage βV is a positive number and can change with the operating state of the load 220. For example, the undervoltage reserve voltage βV can be equal to VBAT-IR-δV-Vb. That is, the undervoltage reserve voltage βV is reserved based on VBAT-IR-δV.

[0066] It is understandable that the values ​​of the reserved safety voltage δV and the undervoltage point reserved voltage βV may be the same or different. The embodiments of the present application do not further limit the values ​​of the reserved safety voltage δV and the undervoltage point reserved voltage βV.

[0067] For example, when Vin < VBAT - IR - δV - βV, that is, the input voltage of the BUCK converter 100 is less than the minimum voltage at which the load 220 can operate normally, it can be determined that the BUCK converter 100 or the silicon anode battery 210 is in an abnormal state. At this time, the control device 120 can control the first switching transistor Q1 and the second switching transistor Q2 to turn off, so that the silicon anode battery 210 and the BUCK converter 100 can be disconnected from the load 220, playing a role in protecting the load 220 and reducing the risk of damage to the load 220.

[0068] When Vin ≥ VBAT - IR - δV - βV, that is, the input voltage of the BUCK converter 100 is greater than or equal to the minimum voltage at which the load 220 can operate normally, the load 220 is in a normal operating state. At this time, the control device 120 can control the first switching transistor Q1 and the second switching transistor Q2 to conduct alternately, so that the BUCK converter 100 can provide a stable DC voltage for the load 220.

[0069] It can be understood that by adopting the above control logic, a undervoltage point reserved voltage βV is reserved based on the difference between the battery voltage VBAT and the voltage drop (i.e., IR) of the BUCK converter 100 and the reserved safety voltage δV, reducing the risk that the first switching transistor Q1 and the second switching transistor Q2 turn off during the normal operation of the load 220 and improving the stability of the BUCK converter 100.

[0070] In some examples, as shown in FIG. 5, the BUCK converter 100 further includes a BUCK power supply 130, and the BUCK power supply 130 is electrically connected to the power input terminal 120c of the control device 120.

[0071] It can be understood that by setting the BUCK power supply 130 to be electrically connected to the power input terminal 120c of the control device 120, the BUCK power supply 130 can supply power to the control device 120, so that the control device 120 can control the conduction or disconnection of the first switching transistor Q1 and the second switching transistor Q2.

[0072] In some examples, as shown in FIG. 5, the BUCK converter 100 further includes a drive circuit 140. The drive circuit 140 is electrically connected to the BUCK power supply 130 and the control device 120, and the BUCK power supply 130 provides a drive voltage to the control device 120 through the drive circuit 140.

[0073] With such a setting, the BUCK power supply 130 can provide a drive voltage to the control device 120, so that the control device 120 can provide a drive voltage to the control terminals of the switching transistors (including the first switching transistor Q1 and the second switching transistor Q2) to control the switching transistors (including the first switching transistor Q1 and the second switching transistor Q2) to conduct.

[0074] In some examples, the output voltage of the BUCK power supply 130 is greater than the output voltage of the silicon anode battery 210 .

[0075] It can be understood that by setting the output voltage of the buck power supply 130 to be greater than the output voltage of the silicon anode battery 210, the buck power supply 130 can provide a high-level voltage to the control device 120, which in turn enables the control device 120 to provide a high-level voltage to the control terminals of the switches (including the first switch Q1 and the second switch Q2). This allows the gate voltage (the voltage at the control terminal) of the N-channel MOSFET (i.e., the first switch Q1 and the second switch Q2) to be greater than the source voltage (the voltage at the first terminal of the switch), thereby enabling the control device 120 to control the switches (including the first switch Q1 and the second switch Q2) to conduct.

[0076] That is, the output voltage of the BUCK power supply 130 is set to be greater than the output voltage of the silicon negative electrode battery 210, so that the BUCK power supply 130 can provide a high-level voltage to the control device 120, thereby enabling the control device 120 to control the switch tube (including the first switch tube Q1 and the second switch tube Q2) to turn on.

[0077] In some examples, as shown in FIG5 , the drive circuit 140 includes a diode D1 and a second capacitor C2. An anode D11 of the diode D1 is electrically connected to the buck power supply 130, a cathode D12 of the diode D1 is electrically connected to the drive input terminal 120 d of the control device 120 and a first terminal C21 of the second capacitor C2, and a second terminal C22 of the second capacitor C2 is electrically connected to the second terminal Q12 of the first switch transistor Q1.

[0078] It can be understood that diode D1 can act as a reverse cutoff, and second capacitor C2 can act as an energy storage device. With this configuration, the buck power supply 130 can provide a high-level voltage to the control device 120 via the drive circuit 140, thereby enabling the control device 120 to provide a high-level drive voltage to the control terminals of the switches (including the first switch Q1 and the second switch Q2), enabling the control device 120 to control the switches (including the first switch Q1 and the second switch Q2) to conduct. Furthermore, the risk of current flowing along the second capacitor C2 to the diode D1 is reduced, thereby improving the reliability of the buck converter 100.

[0079] In some examples, the buck converter 100 may include a printed circuit board (PCB). For example, the first switch Q1, the second switch Q2, the energy storage element 110, the control device 120, the buck power supply 130, and the drive circuit 140 may be disposed on the same PCB. Alternatively, at least two of the first switch Q1, the second switch Q2, the energy storage element 110, the control device 120, the buck power supply 130, and the drive circuit 140 may be disposed on different PCBs.

[0080] In summary, the embodiments of the present application have at least the following beneficial effects:

[0081] In the embodiment of the present application, both the first switch Q1 and the second switch Q2 are N-channel metal-oxide semiconductor field-effect transistors. N-channel metal-oxide semiconductor field-effect transistors have a lower on-resistance. Compared to the related art in which the first switch Q1 is a P-channel metal-oxide semiconductor field-effect transistor, this reduces losses and heat dissipation in the buck converter 100. This is particularly true when the output voltage of the silicon cathode battery 210 is low and the current flowing through the buck converter 100 is high, thereby reducing losses and heat dissipation in the buck converter 100 and improving the circuit efficiency of the buck converter 100. Furthermore, the higher switching efficiency of N-channel metal-oxide semiconductor field-effect transistors improves the switching efficiency of the switches (including the first switch Q1 and the second switch Q2), thereby enhancing the performance of the buck converter 100.

[0082] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in this application should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A BUCK converter, characterized in that: Used in electronic equipment; the electronic equipment comprises a silicon negative electrode battery and a load, the silicon negative electrode battery is electrically connected to the input end of the BUCK converter, and the output end of the BUCK converter is electrically connected to the load; The BUCK converter includes a first switch tube, a second switch tube and an energy storage element; the first end of the first switch tube is electrically connected to the silicon negative electrode battery, the second end of the first switch tube is electrically connected to the first end of the energy storage element and the first end of the second switch tube, and the second end of the energy storage element is electrically connected to the second end of the second switch tube; the energy storage element is electrically connected to the load, and the first switch tube and the second switch tube are used to control the charging or discharging of the energy storage element; Wherein, the first switch tube and the second switch tube are both N-channel metal-oxide semiconductor field effect transistors.

2. The BUCK converter according to claim 1, characterized in that: Also includes: A control device, wherein a first output end of the control device is electrically connected to a control end of the first switch tube, and a second output end of the control device is electrically connected to a control end of the second switch tube.

3. The BUCK converter according to claim 2, characterized in that: Also includes: A BUCK power supply is electrically connected to a power input terminal of the control device.

4. The BUCK converter according to claim 3, characterized in that: Also includes: A driving circuit is electrically connected to the BUCK power supply and the control device, and the BUCK power supply provides a driving voltage to the control device through the driving circuit.

5. The BUCK converter according to claim 4, characterized in that: The output voltage of the BUCK power supply is greater than the output voltage of the silicon negative electrode battery.

6. The BUCK converter according to claim 4 or 5, characterized in that: The driving circuit includes a diode and a second capacitor; the anode of the diode is electrically connected to the BUCK power supply, the cathode of the diode is electrically connected to the driving input end of the control device and the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the second end of the first switch tube.

7. The BUCK converter according to any one of claims 1 to 6, characterized in that: It also includes a first capacitor; the first end of the first capacitor is electrically connected to the second end of the energy storage element and the first end of the load, and the second end of the first capacitor is electrically connected to the second end of the load and the second end of the second switch tube.

8. The BUCK converter according to any one of claims 1 to 7, characterized in that: The energy storage element includes an inductor.

9. An electronic device, characterized in that: include: Silicon anode battery; The BUCK converter according to any one of claims 1 to 8; the silicon negative electrode battery is electrically connected to the input end of the BUCK converter; as well as, A load, an output end of the BUCK converter is electrically connected to the load.

10. The electronic device according to claim 9, characterized in that: The minimum operating voltage of the silicon negative electrode battery is less than 3.2V.

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