Phase-shifted full-bridge circuit and electronic equipment

Abstract

The invention provides a phase-shifted full-bridge circuit and electronic equipment, and is applied to the technical field of power efficiency. The circuit comprises a leading bridge arm, a lagging bridge arm and a suppression common-state conduction circuit. The leading bridge arm comprises two switching tubes which are connected in series, and the lagging bridge arm comprises two switching tubes which are connected in series; the first end of the suppression common-state conduction circuit is connected with the first end of the leading bridge arm, the first end of the lagging bridge arm and the positive electrode of a power supply, the second end of the suppression common-state conduction circuit is connected with the second end of the leading bridge arm, the second end of the lagging bridge arm and the negative electrode of the power supply, and the third end of the suppression common-state conduction circuit is connected with the third end of the leading bridge arm. And the fourth end of the common-state conduction suppression circuit is connected with the third end of the lagging bridge arm, and is used for suppressing the common-state conduction phenomenon of the phase-shifted full-bridge circuit. Therefore, in the phase-shifted full-bridge circuit provided by the invention, the phase-shifted control is realized by controlling the on or off of the plurality of switching tubes, the pulse width modulation is realized by controlling the duty ratio of the switching signals of the switching tubes, and the flexibility is relatively high.

Description

Technical Field

[0001] The invention relates to the technical field of power efficiency, and in particular to a phase-shifted full-bridge circuit and electronic equipment. Background Art

[0002] High-efficiency power supplies for electronic equipment (such as server power supplies) can minimize energy consumption. Compared with traditional low-efficiency power supplies, high-efficiency power supplies waste less energy when converting electrical energy into useful energy required by electronic equipment. This means that in the case of long-term operation, high-efficiency power supplies can significantly reduce the energy cost of electronic equipment and save a lot of operating expenses for enterprises.

[0003] Since the power module is used to power electronic equipment, the efficiency of the power module directly determines the power supply efficiency of the entire electronic equipment. In the power module, phase shift control technology and pulse width modulation technology (PWM) are generally used to adjust the efficiency of the power module. Its PWM technology is relatively mature, but when the PWM technology works in the hard switch start state of the power module, when the frequency in the circuit increases, the loss increases proportionally, and it will also bring serious electromagnetic interference problems. The phase shift control technology is suitable for high power, small size, and high efficiency occasions, but it is difficult to achieve soft switch start when no-load, resulting in greater losses under no-load conditions, and the control circuit design using phase shift control technology is complex, and improper control will produce DC bias tape to bring disastrous consequences.

[0004] It can be seen that how to realize the switching of phase shift control technology and pulse width modulation under different requirements in a circuit, so as to improve the power supply efficiency, is a problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a phase-shifted full-bridge circuit and an electronic device, which can solve the electromagnetic interference problem caused by pulse width modulation in the prior art, as well as the complex control circuit design caused by the phase-shift control technology, and the problem of easy generation of DC bias magnetism.

[0006] In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides a phase-shifted full-bridge circuit, including: an advanced bridge arm, a lagging bridge arm and a common-state conduction suppression circuit; the advanced bridge arm includes two switch tubes connected in series, and the lagging bridge arm includes two switch tubes connected in series;

[0007] The first end of the common-state conduction suppression circuit is connected to the first end of the leading bridge arm, the first end of the lagging bridge arm and the positive electrode of the power supply, the second end of the common-state conduction suppression circuit is connected to the second end of the leading bridge arm, the second end of the lagging bridge arm and the negative electrode of the power supply, the third end of the common-state conduction suppression circuit is connected to the third end of the leading bridge arm, and the fourth end of the common-state conduction suppression circuit is connected to the third end of the lagging bridge arm, so as to suppress the common-state conduction phenomenon in the phase-shifted full-bridge circuit;

[0008] The leading bridge arm and the lagging bridge arm constitute a full-bridge circuit.

[0009] In some embodiments, the leading bridge arm and the lagging bridge arm each further include: two filtering units, one filtering unit corresponding to one switch tube;

[0010] Wherein, the first end of each filter unit is connected to the first end of the corresponding switch tube;

[0011] The second end of each filter unit is connected to the second end of the corresponding switch tube.

[0012] In some embodiments, the filtering unit includes: a first power tube and a first capacitor;

[0013] The cathode of the first power tube is connected to the first end of the first capacitor, and together they serve as the first end of the filter unit and are connected to the first end of the corresponding switch tube;

[0014] The positive electrode of the first power tube is connected to the second end of the first capacitor, and together they serve as the second end of the filter unit and are connected to the second end of the corresponding switch tube.

[0015] In some embodiments, the common-state conduction suppression circuit includes: a first resonant inductor, a second resonant inductor, a second power tube, and a third power tube;

[0016] The cathode of the second power tube serves as the first end of the common-state conduction suppression circuit, and the cathode of the second power tube is connected to the first end of the leading bridge arm, the first end of the lagging bridge arm and the positive electrode of the power supply;

[0017] The positive electrode of the second power tube is connected to the negative electrode of the third power tube, the first end of the first resonant inductor and the first end of the second resonant inductor;

[0018] The positive electrode of the third power tube serves as the second end of the common-state conduction suppression circuit, and the positive electrode of the third power tube is connected to the second end of the leading bridge arm, the second end of the lagging bridge arm and the negative electrode of the power supply;

[0019] The second end of the first resonant inductor serves as the third end of the common-mode conduction suppression circuit, and the second end of the first resonant inductor is connected to the third end of the leading bridge arm;

[0020] The second end of the second resonant inductor serves as the fourth end of the common-mode conduction suppression circuit, and the second end of the second resonant inductor is connected to the third end of the lagging bridge arm.

[0021] In some embodiments, it also includes: a transformer secondary coil, a fourth voltage regulator tube, a fifth voltage regulator tube and a third resonant inductor; wherein the leading bridge arm, the lagging bridge arm and the suppression common-state conduction circuit serve as the transformer primary coil;

[0022] The first end of the transformer secondary coil is connected to the positive electrode of the fourth voltage regulator tube;

[0023] The second end of the transformer secondary coil is connected to the positive electrode of the fifth voltage regulator tube;

[0024] The third end of the transformer secondary coil is connected to the first end of the third resonant inductor;

[0025] The cathode of the fourth voltage regulator tube is connected to the cathode of the fifth voltage regulator tube and the second end of the third resonant inductor.

[0026] In some embodiments, the invention further includes: a second capacitor;

[0027] A first end of the second capacitor is connected to a third end of the transformer secondary coil and a first end of the third resonant inductor;

[0028] The second end of the second capacitor is connected to the negative electrode of the fourth voltage-stabilizing tube, the negative electrode of the fifth voltage-stabilizing tube and the second end of the third resonant inductor.

[0029] In some embodiments, it further includes: a fourth resonant inductor;

[0030] The first end of the fourth resonant inductor is connected to the negative electrode of the fourth voltage regulator tube and the negative electrode of the fifth voltage regulator tube;

[0031] The second end of the fourth resonant inductor is connected to the second end of the second capacitor and the second end of the third resonant inductor.

[0032] In some embodiments, the phase-shifted full-bridge circuit further includes: a first resistor and a third capacitor;

[0033] A first end of the third capacitor is connected to a first end of the secondary coil of the transformer and a positive electrode of the fourth voltage regulator tube;

[0034] The second end of the third capacitor is connected to the first end of the first resistor;

[0035] The second end of the first resistor is connected to the negative electrode of the fourth voltage regulator tube and the first end of the fourth resonant inductor.

[0036] In some embodiments, the phase-shifted full-bridge circuit further includes: a second resistor and a fourth capacitor;

[0037] A first end of the fourth capacitor is connected to the second end of the transformer secondary coil and the positive electrode of the fifth voltage regulator tube;

[0038] The second end of the fourth capacitor is connected to the first end of the second resistor;

[0039] The second end of the second resistor is connected to the negative electrode of the fifth voltage regulator tube and the first end of the fourth resonant inductor.

[0040] On the other hand, the present invention further provides an electronic device, comprising the above-mentioned phase-shifted full-bridge circuit.

[0041] It can be seen from the above technical scheme that the present invention provides a phase-shifted full-bridge circuit, including: an advanced bridge arm, a lagging bridge arm and a common-state conduction suppression circuit; the advanced bridge arm includes two switch tubes connected in series, and the lagging bridge arm includes two switch tubes connected in series; the first end of the common-state conduction suppression circuit is connected to the first end of the advanced bridge arm, the first end of the lagging bridge arm and the positive pole of the power supply, the second end of the common-state conduction suppression circuit is connected to the second end of the advanced bridge arm, the second end of the lagging bridge arm and the negative pole of the power supply, the third end of the common-state conduction suppression circuit is connected to the third end of the advanced bridge arm, and the fourth end of the common-state conduction suppression circuit is connected to the third end of the lagging bridge arm, which is used to suppress the common-state conduction phenomenon in the phase-shifted full-bridge circuit; the advanced bridge arm and the lagging bridge arm constitute a full-bridge circuit. It can be seen that the present invention realizes the switching of phase-shift control and pulse width modulation through the switch tubes in the circuit, thereby improving the power supply efficiency of the whole machine, and specifically realizes phase-shift control by controlling the conduction or shutdown of multiple switch tubes, and realizes pulse width modulation by controlling the duty cycle of the switch signal of the switch tube. Furthermore, the common-mode conduction suppression circuit in the phase-shift full-bridge circuit provided by the present invention is used to suppress the common-mode conduction phenomenon in the phase-shift full-bridge circuit to ensure the normal operation of the phase-shift full-bridge circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A circuit diagram of a phase-shifted full-bridge circuit provided by an embodiment of the present invention;

[0044] Figure 2 A complete circuit diagram of a phase-shifted full-bridge circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The terms "including" and "having" in the specification of the present invention and the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0047] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] Next, a phase-shifted full-bridge circuit provided by an embodiment of the present invention is described in detail. Figure 1 A circuit diagram of a phase-shifted full-bridge circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the phase-shifted full-bridge circuit includes: an advanced bridge arm 1, a lagging bridge arm 2 and a common-state conduction suppression circuit 3; the advanced bridge arm 1 includes two switch tubes connected in series, and the lagging bridge arm 2 includes two switch tubes connected in series. The connection relationship of the circuit is: the first end of the common-state conduction suppression circuit 3 is connected to the first end of the advanced bridge arm 1, the first end of the lagging bridge arm 2 and the positive pole of the power supply, the second end of the common-state conduction suppression circuit 3 is connected to the second end of the advanced bridge arm 1, the second end of the lagging bridge arm 2 and the negative pole of the power supply, the third end of the common-state conduction suppression circuit 3 is connected to the third end of the advanced bridge arm 1, and the fourth end of the common-state conduction suppression circuit 3 is connected to the third end of the lagging bridge arm 2, which is used to suppress the common-state conduction phenomenon in the phase-shifted full-bridge circuit; the advanced bridge arm 1 and the lagging bridge arm 2 constitute a full-bridge circuit.

[0049] In a specific embodiment, with the continuous development of server technology, the power consumption and performance requirements of servers are also constantly increasing. High-efficiency server power supplies can better adapt to this development trend and provide stable and reliable power supply for servers. In addition, high-efficiency power supplies also support advanced functions such as hot plugging and redundant design, further improving the availability and continuity of servers. High-efficiency server power supplies can minimize energy consumption. Compared with traditional low-efficiency power supplies, high-efficiency power supplies waste less power when converting electrical energy into useful energy required by servers. This means that in the case of long-term operation, high-efficiency power supplies can significantly reduce the energy cost of servers and save a lot of operating expenses for enterprises. Due to the reduction of energy waste and additional power consumption, data centers can operate more efficiently, that is, high-efficiency server power supplies can improve the overall efficiency of data centers and reduce maintenance costs and workload. In addition, high-efficiency power supplies can also reduce heat dissipation, reduce the temperature of data centers, and further reduce heat dissipation costs and carbon emissions. At the same time, high-efficiency power supplies are also more stable and reliable, which can reduce the risk of power failure and enhance the reliability of data centers.

[0050] Since the power module is used to power the server, the efficiency of the power module directly determines the power supply efficiency of the entire server. Phase shift control technology and pulse width modulation technology (PWM) are generally used in the power module to adjust the efficiency of the power module. Phase shift control refers to the control of the output signal by changing the phase of the input AC signal. In phase shift control, the phase of the input signal is adjusted while the amplitude remains unchanged. This changes the phase relationship of the signal without changing the signal amplitude, thereby realizing various processing and adjustments of the signal. In other words, the principle of phase shift control is based on the influence of phase difference on the properties of the signal. By adjusting the phase difference of the signal, the time relationship and phase position of the signal can be changed. However, as an important signal processing technology, phase shift control helps to adjust the stability of AC transmission lines, optimize power factor, and reduce energy waste in conventional power modules or DC / DC conversion circuits. Phase shift control can achieve precise control of signal phase and fine-tune it within the range of 0 to 360 degrees to meet the needs of different application scenarios. However, in some cases, phase shift control may cause duty cycle loss. In phase shift control, when the load is heavy, it is easy to achieve zero voltage conduction, but when the load is light, the capacitor discharges slowly, which increases the complexity of system design. The most important point is that phase shift control requires the use of high-quality phase shifters and related circuit components, which are relatively expensive. At the same time, in order to achieve high-precision phase adjustment and control, complex algorithms, filters and other technical means are also required, which further increases the implementation cost of the system.

[0051] Pulse width modulation (PWM) is an effective technology that uses the digital output of a microprocessor to control analog circuits. The basic principle of PWM is to control the output power of power equipment by changing the pulse width. Specifically, the PWM signal consists of a series of periodic pulses, the width of which varies according to the required analog signal amplitude. The larger the pulse width, the higher the signal amplitude. By adjusting the proportion of the pulse width to the entire period (i.e., the duty cycle), the required waveform (including shape and amplitude) can be equivalently obtained, thereby realizing the control of the analog signal. However, in pulse width modulation (PWM), high-performance digital circuits and microcontrollers are required to achieve precise pulse width control. Since the implementation of PWM control technology requires the use of complex digital circuits and microcontrollers, the technical complexity is high and requires developers to have deep electronic technology and programming capabilities to achieve precise control and optimization of PWM controllers; at the same time, PWM technology is sensitive to fluctuations in system parameters. For example, changes in parameters such as the inductance of the input inductor, the capacitance of the capacitor, and the switching characteristics of the switching device may affect the final control result of the PWM technology; and in order to meet the needs of different application scenarios, the PWM controller also needs to have multiple functions and interfaces, which further increases the cost.

[0052] Therefore, the present invention provides a phase-shifted full-bridge circuit, which can realize the switching of phase-shift control and pulse width modulation according to the needs of users, the current usage scenario, load requirements, etc. Its phase-shifted full-bridge circuit mainly includes: an advanced bridge arm 1, a lagging bridge arm 2 and a common-state conduction suppression circuit 3. Among them, since the advanced bridge arm 1 includes two switching tubes in series and the lagging bridge arm 2 includes two switching tubes in series, the advanced bridge arm 1 and the lagging bridge arm 2 constitute a full-bridge circuit. The working principle of the phase-shifted full-bridge circuit is:

[0053] For phase shift control, power transmission is achieved by controlling the on and off of the switch tube on the bridge arm. Constant frequency soft switch startup is achieved by using specific devices inside the suppression common mode conduction circuit 3. There are two main implementation methods: zero voltage switch startup (ZVS) and zero voltage zero current switch startup (ZVZCS). Among them, zero voltage switch (ZVS) is more commonly used. In the phase shift full bridge circuit, the switch tube is turned on at zero voltage, thereby reducing switching losses and improving circuit efficiency. Its specific implementation method is: adjust the on and off of the switch tube under the corresponding bridge arm to work.

[0054] As for pulse width modulation, the average output voltage is adjusted by changing the duty cycle of the switching signal corresponding to the switching tube, thereby reducing switching losses and improving circuit efficiency.

[0055] Among them, the switching point of phase shift control and pulse width modulation is determined as follows: since the losses of phase shift control include circulating loss, turn-on loss, turn-off loss, etc.; the losses of pulse width modulation include turn-on loss, turn-off loss, etc. Therefore, under light load conditions, the loss of pulse width modulation is slightly smaller than the loss of phase shift control. Since the circulating loss, turn-on loss, and turn-off loss are difficult to accurately extract, the switching point of pulse width modulation and phase shift control is determined by judging the efficiency of the whole machine. Among them, the switching point of phase shift control and pulse width modulation can be determined based on the actual test of the whole machine efficiency in the full range, and the value of the switching point is set to X. In order to avoid frequent switching between the two modes, a hysteresis of 1A can be left at the beginning of the design. The final software switching action is pulse width modulation when the load is less than X-0.5A, and phase shift control when the load is greater than X+0.5A.

[0056] It can be seen from the above technical scheme that the present invention provides a phase-shifted full-bridge circuit, including: an advanced bridge arm, a lagging bridge arm and a common-state conduction suppression circuit; the advanced bridge arm includes two switch tubes connected in series, and the lagging bridge arm includes two switch tubes connected in series; the first end of the common-state conduction suppression circuit is connected to the first end of the advanced bridge arm, the first end of the lagging bridge arm and the positive pole of the power supply, the second end of the common-state conduction suppression circuit is connected to the second end of the advanced bridge arm, the second end of the lagging bridge arm and the negative pole of the power supply, the third end of the common-state conduction suppression circuit is connected to the third end of the advanced bridge arm, and the fourth end of the common-state conduction suppression circuit is connected to the third end of the lagging bridge arm, which is used to suppress the common-state conduction phenomenon in the phase-shifted full-bridge circuit; the advanced bridge arm and the lagging bridge arm constitute a full-bridge circuit. It can be seen that the present invention realizes the switching of phase-shift control and pulse width modulation through the switch tubes in the circuit, thereby improving the power supply efficiency of the whole machine, and specifically realizes phase-shift control by controlling the conduction or shutdown of multiple switch tubes, and realizes pulse width modulation by controlling the duty cycle of the switch signal of the switch tube. Furthermore, the common-mode conduction suppression circuit in the phase-shift full-bridge circuit provided by the present invention is used to suppress the common-mode conduction phenomenon in the phase-shift full-bridge circuit to ensure the normal operation of the phase-shift full-bridge circuit.

[0057] In some embodiments, the leading bridge arm 1 and the lagging bridge arm 2 also include: two filter units, one filter unit corresponds to one switch tube. At this time, the connection relationship is: wherein the first end of each filter unit is connected to the first end of the corresponding switch tube; the second end of each filter unit is connected to the second end of the corresponding switch tube. Wherein, the filter unit includes: a first power tube and a first capacitor; the negative electrode of the first power tube is connected to the first end of the first capacitor, and together as the first end of the filter unit is connected to the first end of the corresponding switch tube; the positive electrode of the first power tube is connected to the second end of the first capacitor, and together as the second end of the filter unit is connected to the second end of the corresponding switch tube.

[0058] In a specific embodiment, it can be understood that: the leading bridge arm 1 includes two leading circuits with the same structure, each leading circuit includes a switching tube and a corresponding filtering unit, that is, each leading circuit includes a switching tube, a first power tube and a first capacitor.

[0059] Under this understanding, the connection relationship between the two leading circuits in the leading bridge arm 1 is: the first end of the first leading circuit is connected to the first end of the lagging bridge arm 2, the first end of the suppression common conduction circuit 3 and the positive pole of the power supply as the first end of the leading bridge arm 1; the second end of the first leading circuit is connected to the first end of the second leading circuit, and together as the third end of the leading bridge arm 1 and the third end of the suppression common conduction circuit 3; the second end of the second leading circuit is connected to the second end of the lagging bridge arm 2, the second end of the suppression common conduction circuit 3 and the negative pole of the power supply as the second end of the leading bridge arm 1. From this connection, it can be determined that the connection relationship between the first leading circuit and the second leading circuit is series connection.

[0060] like Figure 2 As shown, for the first leading circuit, the first leading circuit includes: a switch tube, a first power tube and a first capacitor; Q1 represents the switch tube, D1 represents the first power tube, and C1 represents the first capacitor. The connection relationship at this time is: the control end of the first switch tube Q1 is connected to the corresponding controller as the control end of the leading circuit; the first end of the switch tube Q1 is connected to the negative electrode of the first power tube D1 and the first end of the first capacitor C1, and together as the first end of the first leading circuit, it is connected to the first end of the lagging bridge arm 2, the first end of the suppression common-state conduction circuit 3 and the positive electrode of the power supply; the second end of the switch tube Q1 is connected to the positive electrode of the first power tube D1 and the second end of the first capacitor C1, and together as the third end of the first leading circuit, it is connected to the third end of the suppression common-state conduction circuit 3.

[0061] For the second leading circuit, the second leading circuit includes: a switch tube, a first power tube and a first capacitor; Q11 represents the switch tube, D11 represents the first power tube, and C11 represents the first capacitor. The connection relationship at this time is: the control end of the switch tube Q11 is connected to the corresponding controller as the control end of the leading circuit; the first end of the switch tube Q11 is connected to the negative electrode of the first power tube D11 and the first end of the first capacitor C11, and together as the first end of the second leading circuit is connected to the third end of the suppression common-state conduction circuit 3; the second end of the switch tube Q11 is connected to the positive electrode of the first power tube D11 and the second end of the first capacitor C11, and together as the second end of the second leading circuit is connected to the second end of the lagging bridge arm 2, the second end of the suppression common-state conduction circuit 3 and the negative electrode of the power supply.

[0062] Similarly, it can be understood that: the hysteresis bridge arm 2 includes two hysteresis circuits with the same structure, each hysteresis circuit includes a switch tube and a corresponding filter unit, that is, each hysteresis circuit includes a switch tube, a first power tube and a first capacitor.

[0063] With this understanding, the connection relationship between the two lag circuits in the lag bridge arm 2 is: the first end of the first lag circuit is connected to the first end of the lead bridge arm 1, the first end of the common-mode conduction suppression circuit 3 and the positive pole of the power supply as the first end of the lag bridge arm 2; the second end of the first lag circuit is connected to the first end of the second lag circuit, and together they are connected to the fourth end of the common-mode conduction suppression circuit 3 as the third end of the lag bridge arm 2; the second end of the second lag circuit is connected to the second end of the lead bridge arm 1, the second end of the common-mode conduction suppression circuit 3 and the negative pole of the power supply as the second end of the lag bridge arm 2.

[0064] like Figure 2 As shown, for the first hysteresis circuit, Q2 represents the switch tube, D2 represents the first power tube, and C2 represents the first capacitor. The connection relationship of the first hysteresis circuit is as follows: the control end of the switch tube Q2 is connected to the corresponding controller as the control end of the hysteresis circuit; the first end of the switch tube Q2 is connected to the negative electrode of the first power tube D2 and the first end of the first capacitor C2, and together as the first end of the first hysteresis circuit, it is connected to the first end of the leading bridge arm 1, the first end of the suppression common-state conduction circuit 3 and the positive electrode of the power supply; the second end of the switch tube Q2 is connected to the positive electrode of the first power tube D2 and the second end of the first capacitor C2, and together as the second end of the first hysteresis circuit, it is connected to the fourth end of the suppression common-state conduction circuit 3.

[0065] For the second hysteresis circuit, Q22 represents the switch tube, D22 represents the first power tube, and C22 represents the first capacitor. The connection relationship of the hysteresis circuit is as follows: the control end of the switch tube Q22 is connected to the corresponding controller as the control end of the hysteresis circuit; the first end of the switch tube Q22 is connected to the negative electrode of the first power tube D22 and the first end of the first capacitor C22, and together as the first end of the second hysteresis circuit is connected to the fourth end of the suppression common-state conduction circuit 3; the second end of the switch tube Q22 is connected to the positive electrode of the first power tube D22 and the second end of the first capacitor C22, and together as the second end of the second hysteresis circuit is connected to the second end of the leading bridge arm 1, the second end of the suppression common-state conduction circuit 3 and the negative electrode of the power supply.

[0066] In addition, under this structure, if Figure 2As shown, the suppression common-state conduction circuit 3 includes: a first resonant inductor L1, a second resonant inductor L2, a second power tube D3 and a third power tube D4. The connection relationship of the suppression common-state conduction circuit 3 is as follows: the cathode of the second power tube D3 is connected to the first end of the leading bridge arm 1, the first end of the lagging bridge arm 2 and the positive electrode of the power supply as the first end of the suppression common-state conduction circuit 3; the anode of the second power tube D3 is connected to the cathode of the third power tube D4, the first end of the first resonant inductor L1 and the first end of the second resonant inductor L2; the anode of the third power tube D4 is connected to the second end of the leading bridge arm 1, the second end of the lagging bridge arm 2 and the negative electrode of the power supply as the second end of the suppression common-state conduction circuit 3; the second end of the first resonant inductor L1 is connected to the third end of the leading bridge arm 1 as the third end of the suppression common-state conduction circuit 3; the second end of the second resonant inductor L2 is connected to the third end of the lagging bridge arm 2 as the fourth end of the suppression common-state conduction circuit 3.

[0067] It can be seen that the principle of the leading bridge arm 1, lagging bridge arm 2 and the common-state conduction suppression circuit 3 under the current structure is: the zero voltage switch start in the phase shift control uses the parasitic capacitance (first capacitor C1, C11, C2, C22) of the primary series resonant inductor (first resonant inductor L1 and second resonant inductor L2) and the power tube (first power tube D1, D11, D2, D22) to realize the zero voltage switch start of the switch tube (switch tube Q1, Q11, Q2, Q22), and the two power tubes of each bridge arm are complementary and turned on at 180 degrees. In order to avoid the common-state conduction phenomenon in the circuit, the phase shift full bridge circuit will increase the appropriate dead time. Since the conduction time of each power tube is fixed, and the conduction angles of the two bridge arms differ by a phase, that is, the phase shift angle, the duty cycle can be controlled by adjusting the size of the phase shift angle, and then the output voltage can be adjusted. Among them, Q1, Q11, D1, D11, C1 and C11 constitute a leading bridge arm; Q2, Q22, D2, D22, C2 and C22 constitute a lagging bridge arm; among them, when Q1 is turned on earlier than Q22, Q1 is turned off earlier than Q22; when Q11 is turned on earlier than Q2, Q11 is turned off earlier than Q2.

[0068] It should be noted that it can be understood that the leading bridge arm 1, the lagging bridge arm 2 and the common-mode conduction suppression circuit 3 constitute a primary circuit or a primary coil of a transformer.

[0069] In this structure, when Q1 and Q22, or Q11 and Q2 are turned on at the same time, there is a positive (or negative) square wave voltage in the primary circuit. It can be seen from the conventional inductance formula that the current in the primary circuit changes linearly. When Q1 is turned off early, the voltage between the drain and source of Q11 (DS voltage) will drop. At this time, the primary current needs to extract the charge of the capacitor (C11) corresponding to Q11, and charge the capacitor (C11) corresponding to Q1. When the voltage (DS voltage) between the drain and source of Q11 drops to a negative voltage, D11 is turned on. Since the voltage (DS voltage) between the drain and source of Q11 is clamped, the voltage (DS voltage) between the drain and source of Q11 is approximately zero at this time. If Q11 is driven at this time, zero voltage switching start (ZVS) can be achieved. At this time, it means that Q1 and Q22, or Q11 and Q2 are turned on at the same time, which meets the requirements of certain scenarios.

[0070] In addition, since the specific structures of the leading bridge arm 1, the lagging bridge arm 2 and the suppression common-mode conduction circuit 3 are relatively simple and uncomplicated, when the devices inside fail, it will also affect the control switching of the phase-shifted full-bridge circuit. Therefore, a monitoring circuit can be set up, and the monitoring circuit has three branches. The first branch is connected to the two ends of the leading bridge arm 1, which is used to obtain the signals at both ends of the leading bridge arm 1 at this time, and judge whether the electronic components in the leading bridge arm 1 are faulty according to the signals; the second branch of the monitoring circuit is connected to the two ends of the lagging bridge arm 2, which is used to obtain the signals at both ends of the lagging bridge arm 3 at this time, and judge whether the electronic components in the lagging bridge arm 2 are faulty according to the signals; the third branch of the monitoring circuit is connected to the suppression common-mode conduction circuit 3, which is used to obtain the signals at both ends of the suppression common-mode conduction circuit 3 at this time, and judge whether the electronic components in the suppression common-mode conduction circuit 3 are faulty according to the signals; no matter what the monitoring results of these three circuits are, they will be displayed on the display screen in the monitoring circuit.

[0071] Among them, the monitoring circuit can also be used as a controller to connect the control end of the switching tube. The usage conditions and usage scenarios are pre-set in the control unit in the monitoring circuit, and then the conduction or shutdown of each switching tube is automatically controlled according to the user's selection on the display screen. The usage conditions and usage scenarios set in the control unit are specifically set according to current needs.

[0072] However, in this structure, when Q11 and Q22 are turned on at the same time, the voltage on the connection circuit of the primary coil of the transformer is zero (the voltage on the primary circuit is zero), and no energy is transmitted. If the overall inductor current is to be kept unchanged at this time, the primary current is in a circulating state, and there is a large conduction loss overall, and the current drops again. At this time, it means that Q11 and Q22 are turned on at the same time and it does not meet the requirements of certain scenarios.

[0073] It should be noted that the embodiment provided by the present invention is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0074] The present invention provides a specific circuit structure of an advanced bridge arm, a lagging bridge arm, and a common-state conduction suppression circuit. Under this structure, the switching of phase-shift control and pulse width modulation is realized through the switch tube in the circuit, thereby improving the power supply efficiency of the whole machine. Specifically, the zero-voltage switch start in the phase-shift control is realized by controlling the switch tubes on different bridge arms to turn on or off according to certain requirements, and the pulse width modulation is realized by controlling the duty cycle of the switch signal of the switch tube. And the common-state conduction suppression circuit under this structure is used to suppress the common-state conduction phenomenon in the phase-shift full-bridge circuit, which is only to ensure the normal operation of the phase-shift full-bridge circuit.

[0075] In some embodiments, Figure 2 As shown, the phase-shifted full-bridge circuit 3 also includes: a transformer secondary coil T1, a fourth voltage-stabilizing tube D5, a fifth voltage-stabilizing tube D6, a third resonant inductor L3, a second capacitor C3 and a fourth resonant inductor L4. The connection relationship of the circuit is: the first end of the transformer secondary coil T1 is connected to the positive electrode of the fourth voltage-stabilizing tube D5, the second end of the transformer secondary coil T1 is connected to the positive electrode of the fifth voltage-stabilizing tube D6, the third end of the transformer secondary coil T1 is connected to the first end of the second capacitor C3 and the first end of the third resonant inductor L3; the negative electrode of the fourth voltage-stabilizing tube D5 is connected to the negative electrode of the fifth voltage-stabilizing tube D6 and the first end of the fourth resonant inductor L4; the second end of the fourth resonant inductor L4 is connected to the second end of the second capacitor C3 and the second end of the third resonant inductor L3. It should be noted that the leading bridge arm, the lagging bridge arm and the suppression common-state conduction circuit serve as the primary coil of the transformer.

[0076] besides, Figure 2 The phase-shifted full-bridge circuit 3 shown also includes: a first resistor R1, a third capacitor C4, a second resistor R2 and a fourth capacitor C5. The connection relationship of the circuit is: the first end of the third capacitor C4 is connected to the first end of the transformer secondary coil T1 and the positive electrode of the fourth voltage regulator D5; the second end of the third capacitor C4 is connected to the first end of the first resistor R1; the second end of the first resistor R1 is connected to the negative electrode of the fourth voltage regulator D5 and the first end of the fourth resonant inductor L4; the first end of the fourth capacitor C5 is connected to the second end of the transformer secondary coil T1 and the positive electrode of the fifth voltage regulator D6; the second end of the fourth capacitor C5 is connected to the first end of the second resistor R2; the second end of the second resistor R2 is connected to the negative electrode of the fifth voltage regulator D6 and the first end of the fourth resonant inductor L4.

[0077] according to Figure 2 The phase-shifted full-bridge circuit 3 shown in FIG. Figure 2The working principle of the secondary circuit composed of the leading bridge arm 1, lagging bridge arm 2 and common-state conduction suppression circuit 3, the transformer secondary coil T1, the fourth voltage regulator D5, the fifth voltage regulator D6, the third resonant inductor L3, the second capacitor C3, the fourth resonant inductor L4, the first resistor R1, the third capacitor C4, the second resistor R2 and the fourth capacitor C5 is as follows:

[0078] When Q2 and Q11 are turned on at the same time, the secondary circuit cannot fully provide the load current due to the reduction of the primary current in the primary circuit, and because the two secondary voltage regulators (the fourth voltage regulator D5 and the fifth voltage regulator D6) are in the on and freewheeling state at the same time, the secondary circuit is short-circuited at this time. For this reason, the square wave voltage in the primary circuit is fully applied to the resonant inductor (the first resonant inductor L1 and / or the second resonant inductor L2), and the secondary circuit has a duty cycle loss phenomenon at this time. At this time, the role of the secondary circuit can be understood as the duty cycle loss phenomenon in the current secondary circuit, and the shift control needs to be switched to pulse width modulation. At the same time, it also shows that the simultaneous conduction of Q2 and Q11 does not meet the requirements of certain scenarios.

[0079] It should be noted that the embodiment provided by the present invention is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0080] It can be seen from the above technical scheme that the present invention provides a phase-shifted full-bridge circuit, including: an advanced bridge arm, a lagging bridge arm and a common-state conduction suppression circuit; the advanced bridge arm includes two switch tubes connected in series, and the lagging bridge arm includes two switch tubes connected in series; the first end of the common-state conduction suppression circuit is connected to the first end of the advanced bridge arm, the first end of the lagging bridge arm and the positive pole of the power supply, the second end of the common-state conduction suppression circuit is connected to the second end of the advanced bridge arm, the second end of the lagging bridge arm and the negative pole of the power supply, the third end of the common-state conduction suppression circuit is connected to the third end of the advanced bridge arm, and the fourth end of the common-state conduction suppression circuit is connected to the third end of the lagging bridge arm, which is used to suppress the common-state conduction phenomenon in the phase-shifted full-bridge circuit; the advanced bridge arm and the lagging bridge arm constitute a full-bridge circuit. It can be seen that the present invention realizes the switching of phase-shift control and pulse width modulation through the switch tubes in the circuit, thereby improving the power supply efficiency of the whole machine, and specifically realizes phase-shift control by controlling the conduction or shutdown of multiple switch tubes, and realizes pulse width modulation by controlling the duty cycle of the switch signal of the switch tube. Furthermore, the common-mode conduction suppression circuit in the phase-shift full-bridge circuit provided by the present invention is used to suppress the common-mode conduction phenomenon in the phase-shift full-bridge circuit to ensure the normal operation of the phase-shift full-bridge circuit.

[0081] On the other hand, the present invention also provides an electronic device, comprising the above-mentioned phase-shifted full-bridge circuit, and having the same beneficial effects.

[0082] Among them, the embodiment of the electronic device provided by the present invention is the same as the embodiment of the above-mentioned phase-shifted full-bridge circuit, so the present invention will not be described in detail here.

[0083] The above is a detailed introduction to a phase-shifted full-bridge circuit and an electronic device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A phase-shifted full-bridge circuit, characterized in that: include: An advanced bridge arm, a lagging bridge arm and a common-state conduction suppression circuit; the advanced bridge arm includes two switch tubes connected in series, and the lagging bridge arm includes two switch tubes connected in series; The first end of the common-state conduction suppression circuit is connected to the first end of the leading bridge arm, the first end of the lagging bridge arm and the positive electrode of the power supply, the second end of the common-state conduction suppression circuit is connected to the second end of the leading bridge arm, the second end of the lagging bridge arm and the negative electrode of the power supply, the third end of the common-state conduction suppression circuit is connected to the third end of the leading bridge arm, and the fourth end of the common-state conduction suppression circuit is connected to the third end of the lagging bridge arm, for suppressing the common-state conduction phenomenon of the phase-shifted full-bridge circuit; The leading bridge arm and the lagging bridge arm form a full-bridge circuit.

2. The phase-shifted full-bridge circuit according to claim 1, characterized in that: The leading bridge arm and the lagging bridge arm each further include: two filtering units, one filtering unit corresponding to one switching tube; Wherein, the first end of each of the filter units is connected to the first end of the corresponding switch tube; The second end of each of the filter units is connected to the second end of the corresponding switch tube.

3. The phase-shifted full-bridge circuit according to claim 2, characterized in that: The filtering unit includes: a first power tube and a first capacitor; The cathode of the first power tube is connected to the first end of the first capacitor, and together they serve as the first end of the filter unit and are connected to the first end of the corresponding switch tube; The positive electrode of the first power tube is connected to the second end of the first capacitor, and together they serve as the second end of the filter unit and are connected to the second end of the corresponding switch tube.

4. The phase-shifted full-bridge circuit according to claim 1, characterized in that: The common-state conduction suppression circuit comprises: a first resonant inductor, a second resonant inductor, a second power tube and a third power tube; The cathode of the second power tube serves as the first end of the common-state conduction suppression circuit, and the cathode of the second power tube is connected to the first end of the leading bridge arm, the first end of the lagging bridge arm and the positive electrode of the power supply; The positive electrode of the second power tube is connected to the negative electrode of the third power tube, the first end of the first resonant inductor and the first end of the second resonant inductor; The positive electrode of the third power tube serves as the second end of the common-state conduction suppression circuit, and the positive electrode of the third power tube is connected to the second end of the leading bridge arm, the second end of the lagging bridge arm and the negative electrode of the power supply; The second end of the first resonant inductor serves as the third end of the common-state conduction suppression circuit, and the second end of the first resonant inductor is connected to the third end of the leading bridge arm; The second end of the second resonant inductor serves as the fourth end of the common-mode conduction suppression circuit, and the second end of the second resonant inductor is connected to the third end of the lagging bridge arm.

5. The phase-shifted full-bridge circuit according to any one of claims 1 to 4, characterized in that: Also includes: A transformer secondary coil, a fourth voltage regulator tube, a fifth voltage regulator tube and a third resonant inductor; wherein the leading bridge arm, the lagging bridge arm and the suppression common-state conduction circuit serve as a transformer primary coil; The first end of the secondary coil of the transformer is connected to the positive electrode of the fourth voltage regulator tube; The second end of the transformer secondary coil is connected to the positive electrode of the fifth voltage regulator tube; The third end of the transformer secondary coil is connected to the first end of the third resonant inductor; The cathode of the fourth voltage regulator tube is connected to the cathode of the fifth voltage regulator tube and the second end of the third resonant inductor.

6. The phase-shifted full-bridge circuit according to claim 5, characterized in that: Also includes: A second capacitor; The first end of the second capacitor is connected to the third end of the transformer secondary coil and the first end of the third resonant inductor; The second end of the second capacitor is connected to the negative electrode of the fourth voltage regulator tube, the negative electrode of the fifth voltage regulator tube and the second end of the third resonant inductor.

7. The phase-shifted full-bridge circuit according to claim 6, characterized in that: Also includes: a fourth resonant inductor; The first end of the fourth resonant inductor is connected to the negative electrode of the fourth voltage regulator tube and the negative electrode of the fifth voltage regulator tube; The second end of the fourth resonant inductor is connected to the second end of the second capacitor and the second end of the third resonant inductor.

8. The phase-shifted full-bridge circuit according to claim 7, characterized in that: Also includes: a first resistor and a third capacitor; The first end of the third capacitor is connected to the first end of the secondary coil of the transformer and the positive electrode of the fourth voltage regulator tube; The second end of the third capacitor is connected to the first end of the first resistor; The second end of the first resistor is connected to the cathode of the fourth voltage regulator tube and the first end of the fourth resonant inductor.

9. The phase-shifted full-bridge circuit according to claim 8, characterized in that: Also includes: a second resistor and a fourth capacitor; The first end of the fourth capacitor is connected to the second end of the transformer secondary coil and the positive electrode of the fifth voltage regulator tube; The second end of the fourth capacitor is connected to the first end of the second resistor; The second end of the second resistor is connected to the cathode of the fifth voltage regulator tube and the first end of the fourth resonant inductor.

10. An electronic device, characterized in that: The invention comprises the phase-shifted full-bridge circuit as described in any one of claims 1 to 9.

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