Three-level boost circuit, control method, device and electronic equipment

Abstract

This invention proposes a three-level boost circuit, control method, device, and electronic device. The circuit includes a first boost module, a second boost module, a first diode, and a second diode. The first boost module is connected between the neutral line of the circuit and the positive terminal of the power supply. The anode of the first diode is connected to the neutral line, and the cathode of the first diode is connected to the positive terminal of the power supply. The second boost module is connected between the neutral line and the negative terminal of the power supply. The anode of the second diode is connected to the negative terminal of the power supply, and the cathode of the second diode is connected to the neutral line. By setting the first and second diodes, current can be provided in the first and second sub-cycles respectively, maintaining a difference in the inductor currents in the two boost modules, thereby achieving adjustable output voltages for the two boost modules.

Description

Technical Field

[0001] This invention relates to the field of circuit design, and more particularly to a three-level boost circuit, control method, device, and electronic device. Background Technology

[0002] In existing high-frequency DC power supplies, the input of a three-level boost circuit needs to be connected to two DC power supplies simultaneously. However, when there is only a single DC power supply, the two outputs of the three-level boost circuit can only provide power supply voltages with the same parameters, and it is not possible to adjust one output voltage individually. Summary of the Invention

[0003] The main objective of this invention is to provide a three-level boost circuit, control method, device, and electronic device, aiming to solve the problem that existing three-level boost circuits cannot adjust one voltage level independently in a single DC power supply.

[0004] To achieve the above objectives, the present invention provides a three-level boost circuit, wherein the circuit is connected to a power supply; the circuit includes a first boost module, a second boost module, a first diode, and a second diode; the first boost module is connected between the neutral line of the circuit and the positive terminal of the power supply, the anode of the first diode is connected to the neutral line, and the cathode of the first diode is connected to the positive terminal of the power supply; the second boost module is connected between the neutral line and the negative terminal of the power supply, the anode of the second diode is connected to the negative terminal of the power supply, and the cathode of the second diode is connected to the neutral line; wherein:

[0005] The first boost module is used to adjust the first output voltage in the first sub-cycle and maintain the connection between the neutral line and the positive terminal of the power supply in the second sub-cycle, wherein the first output voltage is the voltage output by the first boost module, and the first sub-cycle and the second sub-cycle are each 1 / 2 control cycle;

[0006] The first diode is used to provide current in the second sub-cycle;

[0007] The second boost module is used to adjust the second output voltage in the second sub-cycle and maintain the connection between the neutral line and the negative terminal of the power supply in the first sub-cycle, wherein the second output voltage is the voltage output by the second boost module;

[0008] The second diode is used to provide current in the first sub-cycle.

[0009] Optionally, the first boost module includes a first switching transistor, a first inductor, a third diode, a first capacitor, and a first control unit; wherein:

[0010] The control terminal of the first switching transistor is connected to the first control unit; the input terminal of the first switching transistor is connected to the positive terminal of the power supply through the first inductor, and the input terminal of the first switching transistor is also connected to the positive terminal of the third diode, and the negative terminal of the third diode is connected to the neutral line through the first capacitor; the output terminal of the first switching transistor is connected to the neutral line.

[0011] A first control unit is configured to generate a first control signal and send the first control signal to the first switching transistor, so that the first switching transistor is turned on or off according to the first control signal.

[0012] Optionally, the second boost module includes a second switching transistor, a second inductor, a fourth diode, a second capacitor, and a second control unit; wherein:

[0013] The control terminal of the second switching transistor is connected to the second control unit; the input terminal of the second switching transistor is connected to the neutral line; the output terminal of the second switching transistor is connected to the negative terminal of the power supply through the second inductor, and the output terminal of the second switching transistor is also connected to the negative terminal of the fourth diode, and the positive terminal of the fourth diode is connected to the neutral line through the second capacitor;

[0014] The second control unit is used to generate a second control signal and send the second control signal to the second switching transistor so that the second switching transistor is turned on or off according to the second control signal.

[0015] Furthermore, to achieve the above objectives, the present invention also provides a three-level boost method, which is applied to the three-level boost circuit described above, and the method includes:

[0016] During the first sub-cycle, the second boost module is controlled to maintain the connection between the neutral line and the negative terminal of the power supply, and the first boost module is controlled to adjust the first output voltage.

[0017] During the second sub-cycle, the first boost module is controlled to maintain the connection between the neutral line and the positive terminal of the power supply, and the second boost module is controlled to adjust the second output voltage.

[0018] Optionally, the first boost module includes a first switching transistor, and the step of controlling the first boost module to adjust the first output voltage includes:

[0019] Obtain the first target output voltage and the input voltage of the power supply;

[0020] The first duty cycle is calculated based on the first target output voltage and the input voltage.

[0021] A first control signal is generated based on the first duty cycle, and the first control signal is sent to the first switching transistor.

[0022] Optionally, the second boost module includes a second switching transistor, and the step of controlling the second boost module to adjust the second output voltage includes:

[0023] Obtain the second target output voltage and the input voltage of the power supply;

[0024] The second duty cycle is calculated based on the second target output voltage and the input voltage.

[0025] A second control signal is generated based on the second duty cycle, and the second control signal is sent to the second switching transistor.

[0026] Optionally, the method further includes:

[0027] Obtain the power supply switching frequency of the power supply, and calculate the control cycle based on the power supply switching frequency;

[0028] The control cycle is divided into a first sub-cycle and a second sub-cycle.

[0029] Optionally, the step of obtaining the power supply switching frequency of the power supply includes:

[0030] Obtain the power supply frequency of the output load of the three-level boost circuit;

[0031] The power supply switching frequency is obtained after adjusting the power supply switching frequency to the power supply frequency.

[0032] In addition, to achieve the above objectives, the present invention also provides a three-level boost converter, the converter including a housing and a three-level boost circuit as described above, the three-level boost circuit being disposed within the housing.

[0033] Furthermore, to achieve the above objectives, the present invention also provides an electronic device, the electronic device comprising:

[0034] The first control module is used to control the second boost module to maintain the connection between the neutral line and the negative terminal of the power supply during the first sub-cycle, and to control the first boost module to adjust the first output voltage.

[0035] The second control module is used to control the first boost module to maintain the connection between the neutral line and the positive terminal of the power supply during the second sub-cycle, and to control the second boost module to adjust the second output voltage.

[0036] This invention proposes a three-level boost circuit, control method, device, and electronic device. The circuit is connected to a power supply. The circuit includes a first boost module, a second boost module, a first diode, and a second diode. The first boost module is connected between the neutral line of the circuit and the positive terminal of the power supply. The anode of the first diode is connected to the neutral line, and the cathode of the first diode is connected to the positive terminal of the power supply. The second boost module is connected between the neutral line and the negative terminal of the power supply. The anode of the second diode is connected to the negative terminal of the power supply, and the cathode of the second diode is connected to the neutral line. The first boost module... The first boost module is configured to adjust a first output voltage in a first sub-cycle and maintain the connection between the neutral line and the positive terminal of the power supply in a second sub-cycle. The first output voltage is the voltage output by the first boost module, and the first and second sub-cycles are each half a control cycle. A first diode is configured to provide current in the second sub-cycle. A second boost module is configured to adjust a second output voltage in the second sub-cycle and maintain the connection between the neutral line and the negative terminal of the power supply in the first sub-cycle. The second output voltage is the voltage output by the second boost module. A second diode is configured to provide current in the first sub-cycle. By setting the first and second diodes, current can be provided in the first and second sub-cycles respectively, maintaining a difference in the inductor currents in the two boost modules, thereby achieving adjustable output voltages for the two boost modules. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a functional block diagram of an embodiment of the three-level boost circuit of the present invention;

[0039] Figure 2 This is a functional block diagram of the three-level boost circuit with dual power supply of the present invention;

[0040] Figure 3 The three-level boost circuit of this invention is applied in... Figure 1 Circuit structure diagram in the embodiment;

[0041] Figure 4 This is a flowchart illustrating an embodiment of the three-level boost circuit control method of the present invention.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0043] Explanation of icon numbers:

[0044] label name label name 100 First boost module D1~D4 Diode 1 to Diode 4 200 Second boost module Q1~Q2 First switching transistor ~ Second switching transistor L1~L2 First inductor ~ Second inductor C1~C2 First capacitor ~ Second capacitor R1~R2 First load ~ Second load N midline Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0048] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0049] This invention provides a three-level boost circuit, applied in a three-level boost device. Please refer to [link / reference]. Figure 1 , Figure 1This is a functional block diagram of an embodiment of the three-level boost circuit of the present invention. In this embodiment, the circuit is connected to a power supply; the circuit includes a first boost module 100, a second boost module 200, a first diode D1, and a second diode D2; the first boost module 100 is connected between the neutral line N of the circuit and the positive terminal of the power supply, the anode of the first diode D1 is connected to the neutral line N, and the cathode of the first diode D1 is connected to the positive terminal of the power supply; the second boost module 200 is connected between the neutral line N and the negative terminal of the power supply, the anode of the second diode D2 is connected to the negative terminal of the power supply, and the cathode of the second diode D2 is connected to the neutral line N; wherein:

[0050] The first boost module 100 is used to adjust the first output voltage in the first sub-cycle and maintain the connection between the neutral line N and the positive terminal of the power supply in the second sub-cycle. The first output voltage is the voltage output by the first boost module 100, and the first sub-cycle and the second sub-cycle are each 1 / 2 control cycle.

[0051] The first diode D1 is used to provide current in the second sub-cycle;

[0052] The second boost module 200 is used to adjust the second output voltage in the second sub-cycle and maintain the connection between the neutral line N and the negative terminal of the power supply in the first sub-cycle, wherein the second output voltage is the voltage output by the second boost module 200;

[0053] The second diode D2 is used to provide current in the first sub-cycle.

[0054] During the first sub-cycle, the second boost module 200 maintains the connection between its neutral line N and the negative terminal of the power supply, and maintains voltage output. The second diode D2 is used to provide current, so that the inductor current in the first boost module 100 and the second boost module 200 is kept different, thus avoiding inductor saturation of the first boost module 100. At this time, the positive and negative terminals of the first boost module 100 are equivalent to being connected in parallel with the power supply. The output voltage of the first boost module 100 can be adjusted by controlling the switching frequency of the switching transistor in the first boost module 100.

[0055] During the second sub-cycle, the first boost module 100 maintains the connection between its neutral line N and the positive terminal of the power supply, and the first boost module 100 maintains voltage output. The first diode D1 is used to provide current, so that the inductor current in the first boost module 100 and the second boost module 200 is kept different, thus avoiding inductor saturation of the second boost module 200. At this time, the positive and negative terminals of the second boost module 200 are equivalent to being connected in parallel with the power supply. The output voltage of the second boost module 200 can be adjusted by controlling the switching frequency of the switching transistor in the second boost module 200.

[0056] It should be noted that, in addition to connecting a single power supply, this embodiment can also connect two power supplies in parallel with the first diode D1 and the second diode D2 respectively, to convert it into an existing three-level boost circuit; see [link to documentation]. Figure 2 When connected in parallel, the positive terminal of the power supply is connected to the negative terminal of the diode, and the negative terminal of the power supply is connected to the positive terminal of the diode. When the power supply is connected in parallel, the first diode D1 and the second diode D2 are cut off. At this time, the effective circuit structure is equivalent to the existing three-level boost circuit.

[0057] In this embodiment, by setting a first diode D1 and a second diode D2, current can be provided in the first sub-cycle and the second sub-cycle respectively, so that the inductor current in the two boost modules remains different, thereby realizing that the output voltage of the two boost modules is adjustable.

[0058] Further, see Figure 3 The first boost module 100 includes a first switching transistor Q1, a first inductor L1, a third diode D3, a first capacitor C1, and a first control unit; wherein:

[0059] The control terminal of the first switch Q1 is connected to the first control unit; the input terminal of the first switch Q1 is connected to the positive terminal of the power supply through the first inductor L1, and the input terminal of the first switch Q1 is also connected to the positive terminal of the third diode D3. The negative terminal of the third diode D3 is connected to the neutral line N through the first capacitor C1; the output terminal of the first switch Q1 is connected to the neutral line N; the first capacitor C1 is connected in parallel with the first load R1. G1 is the control terminal of the first switch Q1, used for connection to the first control unit.

[0060] During the first sub-cycle, the neutral line N is short-circuited with the negative terminal of the power supply. If the first switch Q1 is turned on, the power supply charges the first inductor L1, the third diode D3 is turned off, and the first capacitor C1 supplies power to the connected load. If the first switch Q1 is turned off, the third diode D3 is turned on, and the first inductor L1 charges the first capacitor C1 through the third diode D3. At this time, the output voltage of the first boost module 100 is the sum of the voltage of the first inductor L1 and the input voltage of the power supply.

[0061] During the second sub-cycle, the first switch Q1 remains on, the first inductor L1 is saturated with current, which is equivalent to a wire, causing the neutral line N to be short-circuited with the positive terminal of the power supply; the first capacitor C1 continues to supply power to the load.

[0062] A first control unit is configured to generate a first control signal and send the first control signal to the first switch Q1, so that the first switch Q1 is turned on or off according to the first control signal.

[0063] In this embodiment, the first switching transistor Q1 can be a power switching device such as a MOSFET or an IGBT, which can be selected according to the actual application scenario and needs, and is not limited here.

[0064] Furthermore, the second boost module 200 includes a second switch Q2, a second inductor L2, a fourth diode D4, a second capacitor C2, and a second control unit; wherein:

[0065] The control terminal of the second switch Q2 is connected to the second control unit; the input terminal of the second switch Q2 is connected to the neutral line N; the output terminal of the second switch Q2 is connected to the negative terminal of the power supply through the second inductor L2, and the output terminal of the second switch Q2 is also connected to the negative terminal of the fourth diode D4. The positive terminal of the fourth diode D4 is connected to the neutral line N through the second capacitor C2; the second capacitor C2 is connected in parallel with the second load R2. G2 is the control terminal of the second switch Q2, used for connection to the second control unit.

[0066] During the first sub-cycle, the second switch Q2 remains on, the second inductor L2 is saturated with current, which is equivalent to a wire, causing the neutral line N to be short-circuited with the negative terminal of the power supply; the second capacitor C2 continues to supply power to the load.

[0067] During the second sub-cycle, the neutral line N is short-circuited with the positive terminal of the power supply. If the second switch Q2 is turned on, the power supply charges the second inductor L2, the fourth diode D4 is turned off, and the second capacitor C2 supplies power to the connected load. If the second switch Q2 is turned off, the fourth diode D4 is turned on, and the second inductor L2 charges the second capacitor C2 through the fourth diode D4. At this time, the output voltage of the second boost module 200 is the sum of the voltage of the second inductor L2 and the input voltage of the power supply.

[0068] The second control unit is used to generate a second control signal and send the second control signal to the second switch Q2 so that the second switch Q2 is turned on or off according to the second control signal.

[0069] In this embodiment, the second switch Q2 can be a power switching device such as a MOSFET or an IGBT, which can be selected according to the actual application scenario and needs, and is not limited here.

[0070] It should be noted that the first control unit and the second control unit can be combined into one control unit, or they can be set up as two separate control units.

[0071] See you again Figure 2 The principle of the three-level boost circuit of the present invention will be explained in conjunction with the overall circuit structure of this embodiment:

[0072] During the first sub-cycle, the second switch Q2 is kept on, and the current in the second inductor L2 is saturated, maintaining its maximum current value, equivalent to a wire, with the neutral line N short-circuited to the negative terminal of the power supply. At this time, the second diode D2 acts as a freewheeling diode, providing current. The sum of the current provided by the second diode D2 and the current in the first inductor L1 equals the current in the second inductor L2, ensuring the difference between the currents in the first inductor L1 and the second inductor L2 and preventing the first inductor L1 from saturating. The fourth diode D4 is off, and the second capacitor C2 continues to supply power to the load. If the first switch Q1 is on, the power supply charges the first inductor L1, the third diode D3 is off, and the first capacitor C1 supplies power to the connected load. If the first switch Q1 is off, the third diode D3 is on, and the first inductor L1 charges the first capacitor C1 through the third diode D3. At this time, the output voltage of the first boost module 100 is the sum of the voltage of the first inductor L1 and the input voltage of the power supply.

[0073] During the second sub-cycle, the first switch Q1 is kept on, and the current in the first inductor L1 is saturated, maintaining its maximum current value, equivalent to a wire, with the neutral line N short-circuited to the positive terminal of the power supply. At this time, the first diode D1 acts as a freewheeling diode, providing current. The sum of the current provided by the first diode D1 and the current in the second inductor L2 equals the current in the first inductor L1, ensuring the difference in current between the first inductor L1 and the second inductor L2 and preventing the second inductor L2 from saturating. The first capacitor C1 continues to supply power to the load. If the second switch Q2 is on, the power supply charges the second inductor L2, the fourth diode D4 is off, and the second capacitor C2 supplies power to the connected load. If the second switch Q2 is off, the fourth diode D4 is on, and the second inductor L2 charges the second capacitor C2 through the fourth diode D4. At this time, the output voltage of the second boost module 200 is the sum of the voltage of the second inductor L2 and the input voltage of the power supply.

[0074] This embodiment enables independent control of the output voltage of two boost modules under a single power supply.

[0075] In addition, the present invention also protects a three-level boost method, which includes:

[0076] Step S10, within the first sub-cycle, control the second boost module to keep the midline connected to the negative pole of the power supply, and control the first boost module to adjust the first output voltage;

[0077] Step S20, within the second sub-cycle, control the first boost module to keep the midline connected to the positive pole of the power supply, and control the second boost module to adjust the second output voltage.

[0078] This method is applied to a three-level boost circuit. The structure of this three-level boost circuit can refer to the above embodiments and will not be elaborated here. Its implementation process is the same as that of the foregoing structural embodiments and can be referred to for execution.

[0079] Furthermore, the first boost module includes a first switching tube, and step S10 includes:

[0080] Step S11, obtain the first target output voltage and the input voltage of the power supply;

[0081] Step S12, calculate the first duty cycle according to the first target output voltage and the input voltage;

[0082] Step S13, generate a first control signal according to the first duty cycle and send the first control signal to the first switching tube.

[0083] The first target output voltage is the voltage set for the output of the first boost module.

[0084] Specifically, according to the volt-second balance principle, the volt-seconds of the switch-on time must be numerically equal to the volt-seconds of the switch-off time; it can be obtained that:

[0085]

[0086] Among them, V DC is the input voltage, V BUSP is the first target output voltage, d1 is the first duty cycle, and f is the switching frequency of the first switching tube;

[0087] Simplifying the above formula gives: [[ID=4,2]]

[0088]

[0089] As can be seen from the above formula, the first duty cycle can be calculated through the first target output voltage and the input voltage. It can be understood that 0 < d1 < 1. Taking the input voltage as 200V and the first target output voltage as 400V as an example, d1 = 0.5 can be calculated.

[0090] This embodiment can accurately calculate the first duty cycle so that the output voltage of the first boost module is the set first target output voltage.

[0091] Further, the second boost module includes a second switching tube, and the step S20 includes:

[0092] Step S21, obtaining the second target output voltage and the input voltage of the power supply;

[0093] Step S22, calculating the second duty cycle according to the second target output voltage and the input voltage;

[0094] Step S23, generating a second control signal according to the second duty cycle and sending the second control signal to the second switching tube.

[0095] The second target output voltage is the voltage set for the output of the second boost module.

[0096] Specifically, according to the volt-second balance principle, it can be obtained that:

[0097]

[0098] where V BUSN is the second target output voltage and d2 is the second duty cycle;

[0099] Simplifying the above formula gives:

[0100]

[0101] It can be seen from the above formula that the second duty cycle can be calculated through the second target output voltage and the input voltage. It can be understood that 0 < d2 < 1. Taking the input voltage as 200V and the second target output voltage as 300V as an example, d1 = 0.333 can be calculated.

[0102] It should be noted that when using traditional dual power supply, if the input voltages of the two power supplies are both 100V, at this time, if the first target output voltage is 400V and the second target output voltage is 300V, the required first duty cycle is 0.75 and the second duty cycle is 0.667; which is significantly higher than the duty cycle in single power supply. Therefore, the single power supply in this embodiment can control the output voltage with a smaller duty cycle, so as to reduce losses. The calculation method of the duty cycle in dual power supply can refer to the existing technology and will not be elaborated here.

[0103] It should be noted that when using a traditional dual power supply, the input current of the two power supplies differs significantly. For example, when the first target output voltage is 400V, the output power of the power supply corresponding to the first boost module is 4000W, and when the second target output voltage is 300V, the output power of the power supply corresponding to the second boost module is 600W. In this case, the input current of the power supply corresponding to the first boost module is 40A, and the input current of the power supply corresponding to the second boost module is 6A. However, in this embodiment, under the above conditions, the input current of the power supply is half of the input current of the dual power supply, i.e., 23A, which reduces losses.

[0104] This embodiment can accurately calculate the second duty cycle so that the output voltage of the second boost module is the set second target output voltage.

[0105] Furthermore, the method also includes:

[0106] Step S30: Obtain the power supply switching frequency of the power supply, and calculate the control cycle based on the power supply switching frequency;

[0107] Step S40: Divide the control cycle into the first sub-cycle and the second sub-cycle.

[0108] The power supply switching frequency depends on the current power supply frequency required by the load; the power supply switching frequency can be set by the corresponding software, or it can be automatically adjusted adaptively based on the connected load.

[0109] Once the power supply switching frequency is obtained based on the power supply frequency of the currently connected load, the reciprocal of the power supply switching frequency can be taken as the control cycle. For example, if the power supply switching frequency is fa, then the control cycle is 1 / fa. Specifically, if the power supply switching frequency is 50Hz, then the control cycle is 1 / 50Hz = 0.02s = 20ms; that is, 20ms is one control cycle.

[0110] The first sub-cycle and the second sub-cycle are each half of the control cycle. Taking a control cycle of 20ms as an example, the first 10ms can be used as the first sub-cycle and the last 10ms as the second sub-cycle, or the first 10ms can be used as the second sub-cycle and the last 10ms as the first sub-cycle.

[0111] This embodiment can reasonably set the control cycle, as well as the first sub-cycle and the second sub-cycle.

[0112] Step S30 includes:

[0113] Step S31: Obtain the power supply frequency of the output load of the three-level boost circuit;

[0114] Step S32: Adjust the power supply switching frequency to the power supply frequency and then obtain the power supply switching frequency.

[0115] By adjusting the power supply switching frequency to match the power supply frequency, the dynamic adjustment of output voltage and load can be better met. Specifically, when the input voltage is 200V, the three-level boost circuit is connected to a load with an unbalanced power supply frequency of 50Hz. At this time, the control cycle is 20ms. From 0 to 10ms, the first boost module needs to provide a voltage of 400V and a power of 4000W; from 10 to 20ms, the second boost module needs to provide a voltage of 300V and a power of 600W. When the power supply switching frequency is adjusted to match the power supply frequency of the load, i.e., 50Hz, the three-level boost circuit provides 400V to the positive side (i.e., the first boost module) and a power of 4000W within 0 to 10ms; and provides 300V to the negative side (i.e., the second boost module) and a power of 600W within 10 to 20ms.

[0116] This embodiment adapts the power supply switching frequency to match the power supply frequency, thereby meeting the power supply requirements of the load and possessing good dynamic adjustment performance.

[0117] This invention also protects a three-level boost converter, which includes a housing and a three-level boost circuit. The three-level boost circuit is disposed within the housing. The structure of the three-level boost circuit can be referred to in the above embodiment, and will not be repeated here. Accordingly, since the three-level boost converter of this embodiment adopts the above-described three-level boost circuit technical solution, it possesses all the beneficial effects of the above-described three-level boost circuit.

[0118] The present invention also protects an electronic device, the electronic device comprising:

[0119] The first control module is used to control the second boost module to maintain the connection between the neutral line and the negative terminal of the power supply during the first sub-cycle, and to control the first boost module to adjust the first output voltage.

[0120] The second control module is used to control the first boost module to maintain the connection between the neutral line and the positive terminal of the power supply during the second sub-cycle, and to control the second boost module to adjust the second output voltage.

[0121] This electronic device, by setting a first diode and a second diode, enables current to be provided in the first sub-cycle and the second sub-cycle respectively, so that the inductor current in the two boost modules remains different, thereby realizing the adjustable output voltage of the two boost modules.

[0122] It should be noted that the first control module in this embodiment can be used to execute step S10 in the embodiment of this application, and the second control module in this embodiment can be used to execute step S20 in the embodiment of this application.

[0123] Furthermore, the first control module includes:

[0124] The first acquisition unit is used to acquire the first target output voltage and the input voltage of the power supply.

[0125] The first calculation unit is used to calculate the first duty cycle based on the first target output voltage and the input voltage;

[0126] The first transmitting unit is configured to generate a first control signal according to the first duty cycle and send the first control signal to the first switching transistor.

[0127] Optionally, the second boost module includes a second switching transistor, and the second control module includes:

[0128] The second acquisition unit is used to acquire the second target output voltage and the input voltage of the power supply.

[0129] The second calculation unit is used to calculate the second duty cycle based on the second target output voltage and the input voltage;

[0130] The second transmitting unit is used to generate a second control signal according to the second duty cycle and send the second control signal to the second switching transistor.

[0131] Optionally, the electronic device further includes:

[0132] The first acquisition module is used to acquire the power supply switching frequency of the power supply and calculate the control cycle based on the power supply switching frequency;

[0133] The first execution module is used to divide the control cycle into the first sub-cycle and the second sub-cycle.

[0134] Optionally, the first acquisition module includes:

[0135] The third acquisition unit is used to acquire the power supply frequency of the output load of the three-level boost circuit;

[0136] The fourth acquisition unit is used to acquire the power supply switching frequency after adjusting the power supply switching frequency to the power supply frequency.

[0137] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element. The sequence numbers of the above-described embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0138] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A three-level boost circuit, characterized in that, The circuit is connected to a power supply; the circuit includes a first boost module, a second boost module, a first diode, and a second diode; the first boost module is connected between the neutral line of the circuit and the positive terminal of the power supply, the anode of the first diode is connected to the neutral line, and the cathode of the first diode is connected to the positive terminal of the power supply; the second boost module is connected between the neutral line and the negative terminal of the power supply, the anode of the second diode is connected to the negative terminal of the power supply, and the cathode of the second diode is connected to the neutral line; wherein: The first boost module is used to adjust the first output voltage in the first sub-cycle and maintain the connection between the neutral line and the positive terminal of the power supply in the second sub-cycle, wherein the first output voltage is the voltage output by the first boost module, and the first sub-cycle and the second sub-cycle are each 1 / 2 control cycle; The first diode is used to provide current in the second sub-cycle; The second boost module is used to adjust the second output voltage in the second sub-cycle and maintain the connection between the neutral line and the negative terminal of the power supply in the first sub-cycle, wherein the second output voltage is the voltage output by the second boost module; The second diode is used to provide current in the first sub-cycle.

2. The three-level boost circuit as described in claim 1, characterized in that, The first boost module includes a first switching transistor, a first inductor, a third diode, a first capacitor, and a first control unit; wherein: The control terminal of the first switching transistor is connected to the first control unit; the input terminal of the first switching transistor is connected to the positive terminal of the power supply through the first inductor, and the input terminal of the first switching transistor is also connected to the positive terminal of the third diode, and the negative terminal of the third diode is connected to the neutral line through the first capacitor; the output terminal of the first switching transistor is connected to the neutral line. A first control unit is configured to generate a first control signal and send the first control signal to the first switching transistor, so that the first switching transistor is turned on or off according to the first control signal.

3. The three-level boost circuit as described in claim 1, characterized in that, The second boost module includes a second switching transistor, a second inductor, a fourth diode, a second capacitor, and a second control unit; wherein: The control terminal of the second switching transistor is connected to the second control unit; the input terminal of the second switching transistor is connected to the neutral line; the output terminal of the second switching transistor is connected to the negative terminal of the power supply through the second inductor, and the output terminal of the second switching transistor is also connected to the negative terminal of the fourth diode, and the positive terminal of the fourth diode is connected to the neutral line through the second capacitor; The second control unit is used to generate a second control signal and send the second control signal to the second switching transistor so that the second switching transistor is turned on or off according to the second control signal.

4. A control method for a three-level boost circuit, characterized in that, The method is applied to a three-level boost circuit as described in any one of claims 1 to 3, and the method includes: During the first sub-cycle, the second boost module is controlled to maintain the connection between the neutral line and the negative terminal of the power supply, and the first boost module is controlled to adjust the first output voltage. During the second sub-cycle, the first boost module is controlled to maintain the connection between the neutral line and the positive terminal of the power supply, and the second boost module is controlled to adjust the second output voltage.

5. The three-level boost circuit control method as described in claim 4, characterized in that, The first boost module includes a first switching transistor, and the step of controlling the first boost module to adjust the first output voltage includes: Obtain the first target output voltage and the input voltage of the power supply; The first duty cycle is calculated based on the first target output voltage and the input voltage. A first control signal is generated based on the first duty cycle, and the first control signal is sent to the first switching transistor.

6. The three-level boost circuit control method as described in claim 4, characterized in that, The second boost module includes a second switching transistor, and the step of controlling the second boost module to adjust the second output voltage includes: Obtain the second target output voltage and the input voltage of the power supply; The second duty cycle is calculated based on the second target output voltage and the input voltage. A second control signal is generated based on the second duty cycle, and the second control signal is sent to the second switching transistor.

7. The three-level boost circuit control method as described in claim 4, characterized in that, The method further includes: Obtain the power supply switching frequency of the power supply, and calculate the control cycle based on the power supply switching frequency; The control cycle is divided into a first sub-cycle and a second sub-cycle.

8. The three-level boost circuit control method as described in claim 7, characterized in that, The step of obtaining the power supply switching frequency of the power supply includes: Obtain the power supply frequency of the output load of the three-level boost circuit; The power supply switching frequency is obtained after adjusting the power supply switching frequency to the power supply frequency.

9. A three-level boost converter, characterized in that, The device includes a housing and a three-level boost circuit as described in any one of claims 1 to 3, wherein the three-level boost circuit is disposed within the housing.

10. An electronic device, characterized in that, The electronic device includes a three-level boost circuit as described in any one of claims 1 to 3, the electronic device comprising: The first control module is used to control the second boost module to maintain the connection between the neutral line and the negative terminal of the power supply during the first sub-cycle, and to control the first boost module to adjust the first output voltage. The second control module is used to control the first boost module to maintain the connection between the neutral line and the positive terminal of the power supply during the second sub-cycle, and to control the second boost module to adjust the second output voltage.

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