Totem pole circuit control method, totem pole circuit and electronic device

Abstract

The present application discloses a control method of a totem pole circuit, a totem pole circuit and an electronic device, wherein the control method of the totem pole circuit includes: obtaining an input voltage in a power subcircuit; detecting whether the input voltage is within a set threshold range; if the input voltage is within the set threshold range, detecting whether the energy storage current in the power subcircuit is zero-crossing; if the energy storage current is zero-crossing, stopping sending a drive control signal to the switch subcircuit. Through the above-mentioned manner, the control method of the totem pole circuit of the present application can effectively control the turn-off moment of all switch tubes in the totem pole circuit at the zero-crossing point of the AC input voltage, thereby controlling the peak value of the energy storage current at the turn-off moment, and optimizing the LC oscillation of the turn-off energy storage current, thereby improving efficiency to a certain extent, and effectively suppressing the distortion of the energy storage current waveform, thereby reducing the THD of the energy storage current and improving the overall PF value of the totem pole circuit.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a control method of a totem pole circuit, a totem pole circuit and an electronic device. Background Art

[0002] Since the totem pole circuit working in TCM (Triangular Current Mode) mode has the advantages of high efficiency, simple structure and low industrial mode interference, the control technology related to the soft switching of totem pole circuit has gradually become a research hotspot of high-efficiency power supply in recent years.

[0003] However, in the control of the totem pole circuit, at the zero-crossing point of the AC input voltage, the inductor current in the totem pole circuit usually generates a spike, which causes the current waveform to be distorted, increases the THD (Total Harmonic Distortion) of the current, and reduces the PF (Power Factor) value.

[0004] And the zero-crossing signal of the AC input voltage may occur at any time in a switching cycle of the totem pole circuit. However, especially for the totem pole circuit working in the TCM mode, if all the switches in the totem pole circuit are turned off when the inductor current is large, severe current LC (Inductor Capacitance, inductor, capacitor resonant circuit) oscillation will be generated during shutdown, resulting in large losses. Summary of the invention

[0005] The main technical problem solved by the present application is to provide a control method for a totem pole circuit, a totem pole circuit and an electronic device, which can solve the problem that the control method of the totem pole circuit in the prior art cannot determine the turn-off time of all switch tubes in the totem pole circuit at the zero-crossing point of the AC input voltage, so that the oscillation amplitude of the inductor current has a certain randomness, and the current waveform distortion cannot be effectively suppressed, the THD of the inductor current is large, and the PF value is also low.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a control method for a totem pole circuit, the totem pole circuit includes a power sub-circuit and a switch sub-circuit, the power sub-circuit is coupled to the switch sub-circuit, and is used to couple with the power supply circuit, wherein the control method of the totem pole circuit includes: obtaining the input voltage in the power sub-circuit; detecting whether the input voltage is within a set threshold range; if the input voltage is within the set threshold range, detecting whether the energy storage current in the power sub-circuit passes through zero; if the energy storage current passes through zero, stopping sending a drive control signal to the switch sub-circuit.

[0007] Among them, the control method of the totem pole circuit also includes: if the input voltage exceeds the set threshold range, obtaining the output voltage in the switch subcircuit; using the output voltage to generate a drive control signal; sending the drive control signal to the switch subcircuit so that the switch subcircuit changes the switch state under the action of the drive control signal to adjust the energy storage current and the output voltage.

[0008] Among them, the step of detecting whether the energy storage current in the power sub-circuit passes through zero includes: obtaining the switching current signal sent by the switching sub-circuit; detecting whether the current direction of the switching current signal changes; if the energy storage current passes through zero, the step of stopping sending the drive control signal to the switching sub-circuit includes: if the current direction of the switching current signal changes, stopping sending the drive control signal to the switching sub-circuit.

[0009] Among them, if the current direction of the switching current signal changes, the step of stopping sending the drive control signal to the switching sub-circuit includes: responding to the number of times the current direction of the switching current signal changes being a first set number of times; or, within the first set time length when the current direction of the switching current signal changes again, stopping sending the drive control signal to the switching sub-circuit.

[0010] The first set time length is smaller than the arcsine function of the upper limit value of the set threshold range; the first set number of times is twice the product of the first set time length and the signal frequency of the drive control signal.

[0011] Among them, the step of detecting whether the energy storage current in the power sub-circuit passes through zero includes: detecting a first zero-crossing signal from negative to positive and / or a second zero-crossing signal from positive to negative in the energy storage current; if the energy storage current passes through zero, the step of stopping sending a drive control signal to the switch sub-circuit includes: if the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal, stopping sending a drive control signal to the switch sub-circuit.

[0012] Wherein, if the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal, the step of stopping sending the drive control signal to the switch sub-circuit includes: in response to detecting that the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal for a second set number of times; or, within the second set time length when the energy storage current is the first zero-crossing signal or the second zero-crossing signal, at any moment when the energy storage current is detected to be the first zero-crossing signal or the second zero-crossing signal again, stopping sending the drive control signal to the switch sub-circuit; wherein the second set time length is less than the inverse sine function of the upper limit value of the set threshold range; the second set number of times is the product of the second set time length and the signal frequency of the drive control signal.

[0013] Among them, if the energy storage current passes through zero, the step of stopping sending the drive control signal to the switch sub-circuit includes: if the energy storage current passes through zero, when the input voltage is lower than the product of the set threshold range and the set proportional coefficient, stopping sending the drive control signal to the switch sub-circuit.

[0014] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a totem pole circuit, wherein the totem pole circuit includes a power sub-circuit, a switch sub-circuit and a control sub-circuit, the power sub-circuit is coupled to the switch sub-circuit and is used to couple with the power supply circuit, and the control sub-circuit is coupled to the power sub-circuit and the switch sub-circuit; wherein the control sub-circuit is used to control the switch sub-circuit by adopting the control method of the totem pole circuit as described in any of the above items.

[0015] In order to solve the above technical problems, another technical solution adopted by the present application is: to provide an electronic device, wherein the electronic device includes a shell and a totem pole circuit connected to the shell; wherein the totem pole circuit is the totem pole circuit as described above.

[0016] The beneficial effect of the present application is as follows: Different from the prior art, the control method of the totem pole circuit provided by the present application obtains the input voltage in the power sub-circuit to detect whether the input voltage is within the set threshold range, and when the input voltage is within the set threshold range, detects whether the energy storage current in the power sub-circuit passes through zero, so as to stop sending the drive control signal to the switch sub-circuit when the energy storage current passes through zero, so that after the input voltage passes through zero, in response to the energy storage current passing through zero, the turn-off moment of all switch tubes in the totem pole circuit can be effectively controlled, thereby controlling the energy storage current peak value at the turn-off moment, and optimizing the LC oscillation of the turn-off energy storage current, thereby improving the efficiency to a certain extent, and effectively suppressing the distortion of the energy storage current waveform, thereby reducing the THD of the energy storage current and improving the overall PF value of the totem pole circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 It is a flowchart of a first implementation method of a control method of a totem pole circuit of the present application;

[0019] Figure 2 It is a structural schematic diagram of a first implementation mode of a totem pole circuit of the present application;

[0020] Figure 3It is a structural schematic diagram of a specific embodiment of the totem pole circuit of the present application;

[0021] Figure 4 It is a waveform timing diagram of each signal in the totem pole circuit under the triangular current mode;

[0022] Figure 5 yes Figure 1 A schematic diagram of the waveform timing of the control signal and the energy storage current corresponding to the control method of the totem pole circuit;

[0023] Figure 6 yes Figure 1 A schematic diagram of the waveform timing of the control signal and the input voltage corresponding to the control method of the totem pole circuit;

[0024] Figure 7 is a flow chart of a second implementation method of a totem pole circuit control method of the present application;

[0025] Figure 8 is a flow chart of a third implementation method of a totem pole circuit control method of the present application;

[0026] Fig. 9 It is a schematic structural diagram of an embodiment of an electronic device of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0029] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0031] Please refer to Figure 1 and Figure 2 ,in, Figure 1 is a flow chart of a first embodiment of a control method for a totem pole circuit of the present application, Figure 2 This is a schematic diagram of the structure of the first embodiment of the totem pole circuit of the present application. Specifically, it may include the following steps:

[0032] S11: Obtain the input voltage in the power subcircuit.

[0033] It is understandable that the control method of the totem pole circuit in this embodiment is specifically applied to the following Figure 2The first totem pole circuit 20 shown in the figure includes a first power sub-circuit 21, a first switch sub-circuit 22 and a first control sub-circuit 23. The first power sub-circuit 21 is coupled to the first switch sub-circuit 22 and is used to couple with the power supply circuit 101; wherein the first control sub-circuit 23 is coupled to the first power sub-circuit 21 and the first switch sub-circuit 22 so as to control the first switch sub-circuit 22 using any of the control methods of the totem pole circuit described in this document.

[0034] For easier understanding, please continue to refer to Figure 3 , Figure 3 It is a structural diagram of a specific embodiment of the totem pole circuit of the present application.

[0035] In which, taking the second totem pole circuit 30 as a totem pole PFC (Power Factor Correction) circuit as an example, the second power sub-circuit 31 in the second totem pole circuit 30 may specifically include an energy storage inductor Ln, the second switch sub-circuit 32 may specifically include a first switch tube Q1, a second switch tube Q2, a third switch tube S1 and a fourth switch tube S2, and the second totem pole circuit 30 may specifically further include an energy storage capacitor Cn; the first end of the energy storage inductor Ln is used to couple with the first end of the power supply circuit 101, the second end of the energy storage inductor Ln is coupled to the first end of the first switch tube Q1 and the second end of the second switch tube Q2, and the second end of the first switch tube Q1 is coupled to the third switch tube S1 and the fourth switch tube S2. The second end of the three switch tubes S1 and the first end of the energy storage capacitor Cn are connected and used to couple with the first end Vbus+ of the signal function circuit (not shown in the figure). The first end of the third switch tube S1 is connected to the second end of the fourth switch tube S2 and used to couple with the second end of the power supply circuit 101. The first end of the second switch tube Q2 is connected to the first end of the fourth switch tube S2 and the second end of the energy storage capacitor Cn and used to couple with the second end Vbus- of the signal function circuit. The third end of each of the switch tubes in the first switch tube Q1, the second switch tube Q2, the third switch tube S1 and the fourth switch tube S2 is connected to the control subcircuit (not shown in the figure).

[0036] It is worth noting that the first switch tube Q1 and the second switch tube Q2 are industrial frequency tubes, the third switch tube S1 and the fourth switch tube S2 are high frequency tubes, and when the input voltage Uin provided by the power supply circuit 101 is in the positive half cycle, that is, the input voltage Uin is greater than 0, the third switch tube S1 is an energy storage tube and the fourth switch tube S2 is a freewheeling tube; when the input voltage Uin is in the negative half cycle, that is, the input voltage Uin is less than 0, the fourth switch tube S2 is an energy storage tube and the third switch tube S1 is a freewheeling tube.

[0037] Among them, taking the positive half cycle of the input voltage Uin as an example, the control subcircuit generates the on-time of the third switch tube S1 through closed-loop control. After the third switch tube S1 is turned off, after a short dead time, the fourth switch tube S2 is turned on, and the turning off of the fourth switch tube S2 requires collecting the zero-crossing signal of the energy storage current Iac from positive to negative. When this zero-crossing signal is collected, the fourth switch tube S2 is turned off to complete a switching cycle.

[0038] The signal function circuit can be understood as a load circuit that uses the second totem pole circuit 30 to realize power supply, and can also be understood as a back-end function circuit of the second totem pole circuit 30, so as to realize any reasonable signal function.

[0039] In addition, the term "coupled" herein refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0040] In other embodiments, the second power subcircuit 31 may specifically include a larger number of inductors, and / or resistors, and / or capacitors to form an overall inductive energy storage unit; the second switch subcircuit 32 may specifically include only a third switch tube S1 and a fourth switch tube S2; the energy storage capacitor Cn may also be removed, that is, the second totem pole circuit 30 may specifically be any other reasonable totem pole PFC circuit topology, which is determined by the actual application scenario and is not limited in this application.

[0041] Specifically, the control subcircuit samples and obtains the input voltage Uin from the second power subcircuit 31 , that is, the input voltage Uin of the AC input signal provided by the power supply circuit 101 to the second power subcircuit 31 .

[0042] S12: Detect whether the input voltage is within a set threshold range.

[0043] The control subcircuit determines whether the currently acquired input voltage Uin is within a set threshold range through one or more of any reasonable signal processing methods such as operational amplification, signal comparison, analog-to-digital conversion, program setting, etc.

[0044] It is worth noting that the set threshold range can be specifically understood as the input voltage Uin near zero point, such as -30V (volts) ~ 30V, or -25V ~ 30V and any other reasonable voltage threshold, and this application does not limit this.

[0045] If the input voltage Uin is not within the set threshold range, S13 is executed; if the input voltage Uin is within the set threshold range, S16 is executed.

[0046] S13: Obtain the output voltage in the switch sub-circuit.

[0047] Specifically, the control subcircuit is used to sample from the second switch subcircuit 32 and obtain the output voltage Uo of the output signal which is output to the back-end signal function circuit for power supply.

[0048] S14: Generate a driving control signal using the output voltage.

[0049] Furthermore, the control subcircuit sets the voltage setpoint, i.e., the target output voltage VRef, outputted by the second switch subcircuit 32 to the signal function circuit according to the current power supply demand of the signal function circuit, and then obtains the error value Verr by subtracting the output voltage Uo from the target output voltage VRef, so as to implement feedback regulation control on the error value Verr by using a PI controller (proportional integral controller) to generate a corresponding phase drive control signal.

[0050] S15: Sending a driving control signal to the switch sub-circuit, so that the switch sub-circuit changes the switch state under the action of the driving control signal to adjust the energy storage current and the output voltage.

[0051] The control subcircuit is also used to send the currently generated drive control signal to the second switch subcircuit 32, so that the second switch subcircuit 32 is triggered to turn on or off under the action of the drive control signal, so as to adjust the energy storage current Iac output by the second power subcircuit 31 to the second switch subcircuit 32, and adjust the output voltage output by the second switch subcircuit 32 to the back-end signal function circuit.

[0052] S16: Detect whether the energy storage current in the power sub-circuit passes through zero.

[0053] The control subcircuit samples the energy storage current Iac from the second power subcircuit 31 and detects the zero-crossing point of the energy storage current Iac to determine whether the energy storage current Iac passes through zero, which can be specifically understood as detecting the zero-crossing signal of the energy storage tube current.

[0054] If the energy storage current Iac does not pass through zero, S13 is executed; if the energy storage current Iac passes through zero, S17 is executed.

[0055] S17: Stop sending the driving control signal to the switch sub-circuit.

[0056] Please continue to refer to Figure 4 , Figure 5 as well as Figure 6 ,in, Figure 4 This is a waveform timing diagram of each signal in the totem pole circuit under the triangular current mode. Figure 5 yes Figure 1 The waveform timing diagram of the control signal and the energy storage current corresponding to the control method of the totem pole circuit. Figure 6 yes Figure 1 Schematic diagram of the waveform timing of the control signal and the input voltage corresponding to the control method of the totem pole circuit.

[0057] It is understandable that when the AC input is near zero, that is, when the input voltage Uin passes through zero, in order to avoid peak current, the third switch tube S1 and the fourth switch tube S2 need to stop emitting waves and turn them on again in the next power frequency cycle.

[0058] Among them, Figure 4 As shown, since the zero-crossing point of the input voltage Uin will correspond to any moment of a switching cycle, if the third switch tube S1 and the fourth switch tube S2 are immediately turned off when the input voltage Uin crosses zero, the energy storage current Iac will produce a large oscillation, and since the turn-off moment cannot be determined, the oscillation amplitude of the energy storage current Iac will also have a certain degree of randomness.

[0059] Accordingly, if Figure 5 and Figure 6 As shown, the above scheme effectively controls the turn-off time of all the switch tubes in the totem pole circuit in response to the zero-crossing of the energy storage current Iac after the input voltage Uin passes through zero, that is, when it is detected that the input voltage Uin is too low, that is, the input voltage Uin is within the set threshold range, and the third switch tube S1 and the fourth switch tube S2 need to be turned off to avoid the current spike, the control sub-circuit does not immediately send an instruction to turn off the third switch tube S1 and the fourth switch tube S2, that is, it continues to send a drive control signal to the third switch tube S1 and the fourth switch tube S2, and in the next switching cycle, the zero-crossing signal of the energy storage current Iac is obtained through current detection, and when the energy storage current Iac passes through zero, that is, the zero-crossing signal of the energy storage tube current is detected, the drive control signal is stopped from being sent to the third switch tube S1 and the fourth switch tube S2, so as to trigger the third switch tube S1 and the fourth switch tube S2 to turn off.

[0060] That is to say, turning off the third switch tube S1 and the fourth switch tube S2 completely requires two conditions: one is to detect the zero-crossing signal of the input voltage Uin; the other is to obtain the zero-crossing signal of the energy storage current Iac; therefore, when these two conditions are met at the same time, it is possible to achieve the purpose of reducing the current peak during zero-crossing switching and control the oscillation of the peak current during shutdown. This is because the switch sub-circuit is in the energy storage stage before shutdown, that is, the third switch tube S1 is turned on, and the third switch tube S1 and the fourth switch tube S2 are turned off when the energy storage current Iac passes through zero. At this time, the energy storage current Iac is closer to zero, so the oscillation during shutdown will also be very small. At the same time, this solution has strong controllability, effectively reduces randomness, and only has small oscillations caused by hardware delays. That is, while controlling the peak value of the energy storage current Iac at the shutdown moment, it effectively optimizes the LC oscillation of the energy storage current Iac when it is turned off, improves efficiency to a certain extent, and effectively suppresses the waveform distortion of the energy storage current Iac, reduces the THD of the energy storage current Iac, and improves the overall PF value of the totem pole circuit.

[0061] Furthermore, in some embodiments, in the above S17, it may specifically include: in response to the energy storage current Iac crossing zero, when the input voltage Uin is lower than the product of the set threshold range and the set proportional coefficient, stopping sending the drive control signal to the switch sub-circuit.

[0062] It can be understood that since the signal period of the input voltage Uin is greater than the signal period of the energy storage current Iac, after determining that the input voltage Uin is within the set threshold range, such as lower than 30V, the input voltage Uin corresponding to the first zero crossing moment of the energy storage current Iac has not yet dropped to 0V, and therefore there is sufficient margin to respond to the energy storage current Iac zero crossing and stop sending a drive control signal to the switch sub-circuit; and when the input voltage Uin is closer to 0V, turning off each switch tube in the switch sub-circuit will more effectively suppress possible spike currents and current oscillations.

[0063] In some embodiments, the set proportional coefficient can be any reasonable proportional coefficient such as 0.7, 0.5, 0.2, -0.7, -0.5 or -0.2, and the reference voltage detection accuracy, trying to stop sending the drive control signal to the switch sub-circuit when the input voltage Uin may drop to 0V will more effectively suppress possible peak currents and current oscillations. The specific details are determined by the actual application scenario, and this application does not limit this.

[0064] See also Figure 7 , Figure 7 1 is a flow chart of a second embodiment of the control method of the totem pole circuit of the present application. The control method of the totem pole circuit of this embodiment is Figure 1 A flowchart of a detailed implementation of the control method of the totem pole circuit in the embodiment of the present invention specifically includes the following steps:

[0065] S41: Obtaining the input voltage in the power sub-circuit.

[0066] S42: Detect whether the input voltage is within a set threshold range.

[0067] S43: Obtain the output voltage in the switch sub-circuit.

[0068] S44: Generate a driving control signal using the output voltage.

[0069] S45: Sending the driving control signal to the switch sub-circuit, so that the switch sub-circuit changes the switch state under the action of the driving control signal to adjust the energy storage current and the output voltage.

[0070] Among them, S41, S42, S43, S44 and S45 are Figure 1 S11, S12, S13, S14 and S15 are the same, please refer to S11, S12, S13, S14 and S15 and their related text descriptions for details, which will not be repeated here.

[0071] S46: Acquire the switch current signal sent by the switch sub-circuit.

[0072] It is understandable that in the above control logic, the zero-crossing accuracy and driving delay of the energy storage current Iac are crucial. If the energy storage current Iac actually crosses zero, but it takes too long from generating the zero-crossing signal to transmitting it to the control sub-circuit, it will cause the energy storage tube to continue to be turned on during this period. At this time, the energy storage current Iac rises linearly. The greater the delay, the higher the energy storage current Iac, and the more unfavorable it is to suppress the oscillation of the energy storage current Iac.

[0073] Among them, by utilizing the current zero-crossing signal acquisition function of each switch tube in the switch subcircuit, unlike directly sampling and acquiring the energy storage current Iac, this method collects the current signal flowing through the switch tube. At this time, the zero-crossing signal of the energy storage current Iac becomes a signal of the change in the current direction flowing through the energy storage tube in the switch subcircuit. And because the current acquisition utilizes the internal components of each switch tube in the switch subcircuit, the delay is usually short, between 50ns (nanoseconds) and 100ns, and the low delay can further suppress the current oscillation during shutdown.

[0074] Specifically, taking the switch sub-circuit including the first switch tube Q1, the second switch tube Q2, the third switch tube S1 and the fourth switch tube S2 as an example, the fourth ends of the third switch tube S1 and the fourth switch tube S2 are both coupled to the control sub-circuit, and the fourth ends of the third switch tube S1 and the fourth switch tube S2 can be understood as the connection terminals on the freewheeling path in the switch tube.

[0075] The control sub-circuit is further used to receive the switch current signal sent from the inside of the switch sub-circuit, that is, the fourth end of the third switch tube S1 and the fourth switch tube S2.

[0076] S47: Detect whether the current direction of the switch current signal changes.

[0077] Furthermore, the control subcircuit is also used to detect whether the current direction of the currently received switching current signal changes.

[0078] If the current direction of the switch current signal does not change, S43 is executed; if the current direction of the switch current signal changes, S48 is executed.

[0079] S48: Stop sending the driving control signal to the switch sub-circuit.

[0080] It is understandable that when the control subcircuit determines that the current direction of the switching current signal changes, it corresponds to the energy storage current Iac crossing zero. At this time, it is necessary to stop sending the drive control signal to the switching subcircuit so that each switch tube in the switching subcircuit is triggered to shut down to suppress the peak current.

[0081] Furthermore, in some embodiments, in the above S48, it may specifically include: in response to the number of times that the current direction of the switch current signal changes is a first set number of times, stopping sending the drive control signal to the switch sub-circuit.

[0082] Further, in some embodiments, in the above S48, it may also specifically include: in response to any moment when the current direction of the switching current signal changes again within the first set time length when the current direction of the switching current signal changes, stopping sending the drive control signal to the switching sub-circuit.

[0083] It can be understood that since the signal period of the input voltage Uin is greater than the signal period of the energy storage current Iac, after determining that the input voltage Uin is within the set threshold range, such as lower than 30V, it is detected that the input voltage Uin corresponding to the moment when the current direction of the switching current signal changes for the first time has not yet dropped to 0V, and therefore sufficient margin is left to stop sending the drive control signal to the switching sub-circuit in response to the change in the current direction of the switching current signal; and turning off each switch tube in the switching sub-circuit when the input voltage Uin is closer to 0V will more effectively suppress possible spike currents and current oscillations.

[0084] In some embodiments, the first set time length is less than the arc sine function of the upper limit value of the set threshold range, which is specifically determined by the actual application scenario and is not limited in this application.

[0085] It is worth noting that the input voltage Uin can be understood as a sinusoidal function with time as the independent variable, that is, the input voltage Uin=sint. Taking the upper limit of the threshold range as Uy as an example, theoretically, the duration for Uy to drop to 0V is T1=arcsinUy; and the duration for Uy to drop to -Uy is T11=2*arcsinUy.

[0086] Therefore, within the first set time period when the current direction of the switching current signal changes, the input voltage Uin will still be within the set threshold range, so the drive control signal can be stopped from being sent to the switch sub-circuit at any time when the current direction of the switching current signal changes again; and in order to more effectively suppress possible peak currents and current oscillations, it is preferred to stop sending the drive control signal to the switch sub-circuit at time T1 after the current direction of the switching current signal changes for the first time.

[0087] There are two zero-crossing signals in one signal cycle of the drive control signal, which means that the current direction of the switching current signal will change twice. The first set number of times is twice the product of the first set duration and the signal frequency of the drive control signal.

[0088] See also Figure 8 , Figure 8 1 is a flow chart of a third embodiment of the control method of the totem pole circuit of the present application. The control method of the totem pole circuit of this embodiment is Figure 1 A flowchart of a detailed implementation of the control method of the totem pole circuit in the embodiment of the present invention specifically includes the following steps:

[0089] S51: Obtaining the input voltage in the power sub-circuit.

[0090] S52: Detect whether the input voltage is within a set threshold range.

[0091] S53: Obtain the output voltage in the switch sub-circuit.

[0092] S54: Generate a driving control signal using the output voltage.

[0093] S55: Sending the driving control signal to the switch sub-circuit, so that the switch sub-circuit changes the switch state under the action of the driving control signal to adjust the energy storage current and the output voltage.

[0094] Among them, S51, S52, S53, S54 and S55 are Figure 1 S11, S12, S13, S14 and S15 are the same, please refer to S11, S12, S13, S14 and S15 and their related text descriptions for details, which will not be repeated here.

[0095] S56: Detecting a first zero-crossing signal from negative to positive and / or a second zero-crossing signal from positive to negative in the energy storage current.

[0096] It is understandable that the control subcircuit can also directly sample the energy storage current Iac from the power subcircuit, and process the energy storage current Iac using any reasonable method such as operational amplifier, comparator, analog-to-digital conversion, program control, etc., to determine any one or both of the first zero-crossing signal from negative to positive in the energy storage current Iac and the second zero-crossing signal from positive to negative in the energy storage current Iac.

[0097] If the control subcircuit does not detect any one of the first zero-crossing signal and the second zero-crossing signal, S53 is executed; if the control subcircuit detects any one or both of the first zero-crossing signal and the second zero-crossing signal, S57 is executed.

[0098] S57: Stop sending the driving control signal to the switch sub-circuit.

[0099] It is understandable that the control subcircuit can stop sending the drive control signal to the switch subcircuit when the first zero-crossing signal is detected; or, stop sending the drive control signal to the switch subcircuit when the second zero-crossing signal is detected; or, stop sending the drive control signal to the switch subcircuit when the first zero-crossing signal and the second zero-crossing signal are detected, so that each switch tube in the switch subcircuit is triggered to turn off to suppress the peak current.

[0100] Further, in some embodiments, in the above S57, it may specifically include: in response to detecting that the number of times the energy storage current Iac is the first zero-crossing signal and / or the second zero-crossing signal is the second set number of times, stopping sending the drive control signal to the switch sub-circuit.

[0101] Further, in some embodiments, in the above S57, it can also specifically include: in response to detecting that the energy storage current Iac is the first zero-crossing signal or the second zero-crossing signal within a second set time length, stopping sending the drive control signal to the switch sub-circuit at any time when the energy storage current Iac is detected again as the first zero-crossing signal or the second zero-crossing signal.

[0102] In some embodiments, the second set time length is less than the arcsine function of the upper limit value of the set threshold range, which is specifically determined by the actual application scenario and is not limited in this application.

[0103] Similarly, the input voltage Uin can be understood as a sinusoidal function with time as the independent variable, that is, the input voltage Uin=sint. Taking the upper limit of the threshold range as Uy as an example, theoretically, the duration for Uy to drop to 0V is T2=arcsinUy; and the duration for Uy to drop to -Uy is T21=2*arcsinUy.

[0104] Therefore, within the second set time length when the energy storage current Iac is detected as the first zero-crossing signal or the second zero-crossing signal, the input voltage Uin will still be within the set threshold range. Therefore, the driving control signal can be stopped from being sent to the switch sub-circuit at any time when the energy storage current Iac is detected as the first zero-crossing signal or the second zero-crossing signal again; and in order to more effectively suppress possible peak currents and current oscillations, it is preferred to stop sending the driving control signal to the switch sub-circuit at time T2 after the energy storage current Iac is detected as the first zero-crossing signal or the second zero-crossing signal.

[0105] There are two zero-crossing signals in one signal cycle of the driving control signal, namely the first zero-crossing signal and the second zero-crossing signal, and the second set number of times is the product of the second set duration and the signal frequency of the driving control signal.

[0106] This application also provides an electronic device, see Fig. 9 , Fig. 9 1 is a schematic diagram of the structure of an electronic device of the present application. In this embodiment, the electronic device 60 includes a housing 61 and a totem pole circuit 62 connected to the housing 61 .

[0107] It should be noted that the totem pole circuit 62 described in this embodiment is the first totem pole circuit 20 or the second totem pole circuit 30 described in any one of the above embodiments. Figure 1-Figure 8 And the related text content will not be repeated here.

[0108] The beneficial effect of the present application is as follows: Different from the prior art, the control method of the totem pole circuit provided by the present application obtains the input voltage in the power sub-circuit to detect whether the input voltage is within the set threshold range, and when the input voltage is within the set threshold range, detects whether the energy storage current in the power sub-circuit passes through zero, so as to stop sending the drive control signal to the switch sub-circuit when the energy storage current passes through zero, so that after the input voltage passes through zero, in response to the energy storage current passing through zero, the turn-off moment of all switch tubes in the totem pole circuit can be effectively controlled, thereby controlling the peak value of the energy storage current at the turn-off moment, and optimizing the LC oscillation of the turn-off energy storage current, thereby improving the efficiency to a certain extent, and effectively suppressing the distortion of the energy storage current waveform, thereby reducing the THD of the energy storage current, and improving the overall PF value of the totem pole circuit.

[0109] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a totem pole circuit, wherein the totem pole circuit comprises a power subcircuit and a switch subcircuit, wherein the power subcircuit is coupled to the switch subcircuit and is used to couple with a power supply circuit, wherein: The control method of the totem pole circuit comprises: Acquiring an input voltage in the power subcircuit; Detecting whether the input voltage is within a set threshold range; If the input voltage is within the set threshold range, detecting whether the energy storage current in the power subcircuit passes through zero; If the energy storage current passes through zero, stop sending the drive control signal to the switch sub-circuit; the step of stopping sending the drive control signal to the switch sub-circuit if the energy storage current passes through zero includes: if the energy storage current passes through zero, when the input voltage is lower than the product of the set threshold range and the set proportional coefficient, stop sending the drive control signal to the switch sub-circuit.

2. The control method of the totem pole circuit according to claim 1, characterized in that: The control method of the totem pole circuit further includes: If the input voltage exceeds the set threshold range, obtaining the output voltage in the switch subcircuit; generating the driving control signal using the output voltage; The driving control signal is sent to the switch sub-circuit, so that the switch sub-circuit changes the switch state under the action of the driving control signal to adjust the energy storage current and the output voltage.

3. The control method of the totem pole circuit according to claim 1, characterized in that: The step of detecting whether the energy storage current in the power subcircuit passes through zero comprises: Acquiring a switching current signal sent by the switching sub-circuit; Detecting whether the current direction of the switching current signal changes; The step of stopping sending the drive control signal to the switch sub-circuit if the energy storage current passes through zero comprises: If the current direction of the switch current signal changes, the sending of the drive control signal to the switch sub-circuit is stopped.

4. The control method of the totem pole circuit according to claim 3, characterized in that: If the current direction of the switch current signal changes, the step of stopping sending the drive control signal to the switch sub-circuit comprises: In response to the current direction of the switching current signal changing a first set number of times; or, within the first set time period when the current direction of the switching current signal changes, at any time when the current direction of the switching current signal changes again, stop sending the drive control signal to the switching sub-circuit.

5. The control method of the totem pole circuit according to claim 4, characterized in that: The first set time duration is less than the arcsine function of the upper limit value of the set threshold range; The first set number of times is twice the product of the first set time length and the signal frequency of the driving control signal.

6. The control method of the totem pole circuit according to claim 1, characterized in that: The step of detecting whether the energy storage current in the power subcircuit passes through zero comprises: Detecting a first zero-crossing signal from negative to positive and / or a second zero-crossing signal from positive to negative in the energy storage current; The step of stopping sending the drive control signal to the switch sub-circuit if the energy storage current passes through zero comprises: If the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal, stop sending the drive control signal to the switch sub-circuit.

7. The control method of the totem pole circuit according to claim 6, characterized in that: If the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal, the step of stopping sending the drive control signal to the switch sub-circuit comprises: In response to detecting that the number of times that the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal is a second set number of times; or, within a second set time length when the energy storage current is the first zero-crossing signal and / or the second zero-crossing signal, at any time when the energy storage current is again detected to be the first zero-crossing signal and / or the second zero-crossing signal, stopping sending the drive control signal to the switch sub-circuit; Wherein, the second set time duration is less than the arcsine function of the upper limit value of the set threshold range; The second set number of times is the product of the second set time length and the signal frequency of the driving control signal.

8. A totem pole circuit, characterized in that: The totem pole circuit includes a power subcircuit, a switch subcircuit and a control subcircuit, wherein the power subcircuit is coupled to the switch subcircuit and is used to couple with a power supply circuit, and the control subcircuit is coupled to the power subcircuit and the switch subcircuit; The control subcircuit is used to control the switch subcircuit by adopting the control method of the totem pole circuit as described in any one of claims 1 to 7.

9. An electronic device, characterized in that: The electronic device comprises a housing and a totem pole circuit connected to the housing; Wherein, the totem pole circuit is the totem pole circuit as claimed in claim 8.

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