Push-pull inverter circuit and high-frequency power apparatus

Abstract

A push-pull inverter circuit and a high-frequency power apparatus. The circuit comprises: an input interface (VDC) and a transformer module (110); a first switch module (120), which is connected between a first end of a primary-side coil (111) and a grounding end, wherein a control end of the first switch module (120) is configured to input a first control signal; a second switch module (130), which is connected between a second end of the primary-side coil (111) and the grounding end, wherein a control end of the second switch module (130) is configured to input a second control signal; and a resonant network (140), which is connected to the primary-side coil (111), the first switch module (120) and the second switch module (130), wherein the resonant network (140) is configured to control the soft switching of the first switch module (120) on the basis of the first control signal, and control the soft switching of the second switch module (130) on the basis of the second control signal.

Description

Push-pull inverter circuit and high-frequency power supply device

[0001] This application claims priority to Chinese Patent Application No. 202411460531.9, filed with the Chinese Patent Office on October 18, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of circuit technology, for example to a push-pull inverter circuit and a high-frequency power supply device. Background Technology

[0003] High-frequency inverter circuits are widely used in information technology, industrial automation, medical equipment, aerospace, and other fields. Push-pull inverter circuits in related technologies use silicon-based switching transistors. However, the large gate charge of silicon devices limits their switching frequency, typically not exceeding 1MHz. Furthermore, the large junction capacitance between the drain and source of silicon devices causes high voltage spikes when the switching transistors switch states.

[0004] Therefore, push-pull inverter circuits in related technologies suffer from low frequency and voltage spikes during state switching, resulting in low efficiency and poor reliability. Summary of the Invention

[0005] This application provides a push-pull inverter circuit and a high-frequency power supply device to increase the operating frequency of the push-pull inverter circuit and reduce its size.

[0006] In a first aspect, embodiments of this application provide a push-pull inverter circuit, including:

[0007] The input interface is configured to input DC signals.

[0008] A transformer module, wherein the center tap of the primary winding of the transformer module is connected to the input interface, and the secondary winding of the transformer module is configured to connect to the load;

[0009] The first switch module is connected between the first end of the primary coil and the ground end, and the control end of the first switch module is set to input the first control signal.

[0010] The second switch module is connected between the second end of the primary coil and the ground end, and the control end of the second switch module is set to input a second control signal.

[0011] A resonant network is connected to the primary coil, the first switching module, and the second switching module. The resonant network is configured to control the soft switching of the first switching module according to the first control signal and to control the soft switching of the second switching module according to the second control signal.

[0012] Secondly, this embodiment provides a high-frequency power supply device, including: the push-pull inverter circuit proposed in any of the first aspects. Attached Figure Description

[0013] Figure 1 is a schematic diagram of a push-pull inverter circuit provided in an embodiment of this application;

[0014] Figure 2 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application;

[0015] Figure 3 is a temperature test result diagram of the push-pull inverter circuit provided in the embodiment of this application;

[0016] Figure 4 is a temperature test result diagram of the push-pull inverter circuit provided in the embodiment of this application;

[0017] Figure 5 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application;

[0018] Figure 6 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application;

[0019] Figure 7 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application;

[0020] Figure 8 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application. Detailed Implementation

[0021] The present application will now be described in detail with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application. For ease of description, only the parts relevant to the present application are shown in the drawings, not all of the structures.

[0022] Figure 1 is a schematic diagram of a push-pull inverter circuit provided in an embodiment of this application. As shown in Figure 1, the push-pull inverter circuit includes: an input interface V DC It is used to input DC signals; transformer module 110, the center tap 112 of the primary coil 111 of transformer module 110 is connected to the input interface V DCThe transformer module's secondary coil 113 is connected to the load 150. A first switching module 120 is connected between the first end of the primary coil 111 and the ground terminal, and its control terminal G1 is used to input a first control signal. A second switching module 130 is connected between the second end of the primary coil 111 and the ground terminal, and its control terminal G2 is used to input a second control signal. A resonant network 140 is connected to the primary coil 111, the first switching module 120, and the second switching module 130. The resonant network 140 is used to adjust the soft switching of the first switching module 120 according to the first control signal and to adjust the soft switching of the second switching module 130 according to the second control signal. In other words, the resonant network 140 is configured to control the soft switching of the first switching module 120 according to the first control signal and the soft switching of the second switching module 130 according to the second control signal.

[0023] Among them, the input interface V DC This refers to the DC voltage input of a push-pull inverter circuit, provided by a battery, DC power supply, or other DC power source. For example, the input interface V... DC The voltage provided can be 12V, 24V or 48V, etc.

[0024] Transformer module 110 refers to a device in a push-pull inverter circuit used for adjusting and converting voltage; it can be a step-up or step-down device. For example, transformer module 110 can be a transformer with a center tap. Primary coil 111 refers to the coil located at the input terminal of the transformer, responsible for receiving the input voltage and generating a magnetic field. Center tap 112 refers to a connection point located in the middle of the primary coil 111 or secondary coil 113. Through center tap 112, the voltage of the entire coil can be selected, or only the voltage of a portion of the coil from center tap 112 to either end of the coil can be used. Secondary coil 113 refers to the coil in the transformer opposite to the primary coil 111, responsible for inducing voltage from the magnetic field and outputting it to the load 150. Secondary coil 113 converts the magnetic energy generated by the primary coil 111 into electrical energy and outputs it to the connected load 150.

[0025] Load 150 refers to a device or component connected to the circuit output that consumes electrical energy to perform a specific function. For example, load 150 could be an electric motor, light, heater, electronic equipment, etc.

[0026] The first switching module 120 refers to the switching device responsible for controlling the current flow in the DC circuit section of a push-pull inverter circuit. The main function of the first switching module 120 is to adjust the output voltage and frequency of the circuit through rapid switching operations, thereby achieving efficient power conversion and output control. For example, the first switching module 120 can be a metal-oxide-semiconductor field-effect transistor (MOSFET) or an insulated-gate bipolar transistor (IGBT), etc.

[0027] The first end of the primary coil 111 refers to a connection point of the primary coil 111, which is connected to the first switch module 120 as the input power supply access point. The grounding terminal refers to the connection point where the primary coil 111 is connected to the ground wire 160, used to ensure the safety and stability of the transformer and prevent voltage drift or interference. The control terminal G1 refers to the interface on the first switch module 120 used to receive control signals to adjust the on and off states of the switch. Through the control signals received at the control terminal G1, the first switch module 120 can quickly switch between on and off states to adjust the current flow. The first control signal refers to the signal generated by the external control module and input to the control terminal G1 of the first switch module 120, used to control the state of the switch. For example, when the first control signal is high, the first switch module 120 is on; when the signal is low, the first switch module 120 is off, thereby realizing the control of the current.

[0028] The second switching module 130 refers to another switching device in the DC circuit section of a push-pull inverter circuit, responsible for controlling the flow of current. The main function of the second switching module 130 is to adjust the output voltage and frequency of the circuit through rapid switching operations, thereby achieving efficient power conversion and output control. For example, the second switching module 130 can be a MOSFET or an IGBT.

[0029] The second end of the primary coil 111 refers to another connection point of the primary coil 111, which is connected to the second switch module 130 as the input power supply access point. The control terminal G2 refers to the interface on the second switch module 130 used to receive control signals to adjust the on and off states of the switch. Through the control signals received at the control terminal G2, the second switch module 130 can quickly switch between on and off states, adjusting the current flow. The second control signal refers to the signal generated by the external control module and input to the control terminal G2 of the second switch module 130, used to control the state of the switch. For example, when the second control signal is high, the second switch module 130 is on; when the signal is low, the second switch module 130 is off, thereby achieving current control.

[0030] The resonant network 140 provided in this embodiment is a circuit in a push-pull inverter circuit used to improve energy conversion efficiency, reduce current waveform distortion, and ensure output voltage stability. Soft switching refers to a switching technology that reduces switching losses and electromagnetic interference by minimizing voltage and current spikes generated during the switching process. Soft switching uses a resonant circuit (such as an LC resonant circuit) to control the switching process of the switching device, making the voltage and current close to zero during switching to achieve a smooth transition, which helps reduce voltage and current fluctuations during switching transients.

[0031] In this embodiment of the application, when the first switch module 120 is turned on, the input interface V DC The input DC current flows through the center tap 112 of transformer module 110, passes through the first switching module 120, and flows into the ground wire 160. That is, the direction of current flow in the primary winding 111 of transformer module 110 is the same as the output terminal of the transformer winding, thus inducing a current flowing out of the same terminal of the transformer winding in the secondary winding 113 of transformer module 110. When the second switching module 130 is turned on, the input interface V... DC The input DC current flows through the center tap 112 of the transformer module 110, passes through the second switching module 130, and flows into the ground wire 160. That is, the current flows in the primary winding 111 of the transformer module 110 in the direction of flowing into the same-name terminal of the transformer coil, thus inducing a current flowing into the same-name terminal of the transformer coil in the secondary winding 113 of the transformer module 110. By controlling the first switching module 120 and the second switching module 130 to alternately conduct at a certain frequency, a current with a direction changing at a corresponding frequency is generated in the secondary winding 113 of the transformer module, thereby realizing the inversion from DC to AC. When the resonant network 140 operates at its resonant frequency, the energy exchange between the inductor and capacitor reaches its optimal state. At this time, using the first and second control signals to control the switching of the first switching module 120 and the second switching module 130 enables soft switching of the circuit.

[0032] In this embodiment, the inversion of the push-pull inverter circuit is achieved by controlling the switching frequencies of the first switching module 120 and the second switching module 130, and soft switching of the switching modules is achieved through the resonant network 140. Due to the use of soft-switching technology, this solution can reduce transient voltage and current spikes during the switching process of the switching modules. Secondly, soft switching reduces the switching losses of the devices. Therefore, this solution can significantly improve the overall energy conversion efficiency of the push-pull inverter circuit, enabling the push-pull inverter circuit to operate at ultra-high frequencies above 4MHz, effectively increasing the operating frequency of the push-pull inverter circuit. Furthermore, this embodiment facilitates the operation of the switching modules at lower temperatures, improving the reliability and lifespan of the circuit, and reducing the size of the push-pull inverter circuit.

[0033] Figure 2 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application. Optionally, based on the above embodiment, as shown in Figure 2, the first end of the resonant network 140 is connected to the input interface V. DC The resonant network 140 is connected as follows: its second end is connected to the center tap 112; its third end is connected to the first end of the first switch module 120; its fourth end is connected to the second end of the first switch module 120; its fifth end is connected to the first end of the second switch module 130; and its sixth end is connected to the second end of the second switch module 130. The resonant network 140 is used to adjust the first switch module 120 so that it is turned on according to a first control signal when the voltage between its second and first ends is zero; and to adjust the second switch module 130 so that it is turned on according to a second control signal when the voltage between its second and first ends is zero. In other words, the resonant network 140 is configured to control the first switch module 120 to turn on according to the first control signal when the voltage between its second and first ends is zero; and to control the second switch module 130 to turn on according to the second control signal when the voltage between its second and first ends is zero.

[0034] In some embodiments, the first end of the resonant network 140 is a connection point in the resonant network 140, which is connected to the input interface V. DCA connection is made to receive direct current. The second end of the resonant network 140 is another connection point in the resonant network 140, which is connected to the center tap 112. The third end of the resonant network 140 is another connection point in the resonant network 140, which is connected to the first end of the first switching module 120. The fourth end of the resonant network 140 is another connection point in the resonant network 140, which is connected to the second end of the first switching module 120. The fifth end of the resonant network 140 is another connection point in the resonant network 140, which is connected to the first end of the second switching module 130. The third end of the resonant network 140 is another connection point in the resonant network 140, which is connected to the second end of the second switching module 130.

[0035] In this embodiment, since the resonant network 140 has the structure of an LC resonant circuit, it can control the first switching module 120 and the second switching module 130 to switch when the voltage is almost zero, based on the phase relationship between the current and voltage in the push-pull inverter circuit, thus realizing soft switching.

[0036] Optionally, based on the above embodiments and continuing to refer to FIG2, the first switching module 120 may include a first gallium nitride (GaN) switch 121; the second switching module 130 may include a second GaN switch 131; the resonant network 140 is used to adjust the first GaN switch 121 to turn on according to a first control signal when the voltage between its drain and source is zero; and to adjust the second GaN switch 131 to turn on according to a second control signal when the voltage between its drain and source is zero. In other words, the resonant network 140 is configured to control the first GaN switch 121 to turn on according to the first control signal when the voltage between its drain and source is zero; and to control the second GaN switch 131 to turn on according to the second control signal when the voltage between its drain and source is zero.

[0037] In some embodiments, a gallium nitride (GaN) switch refers to a semiconductor switching device made of gallium nitride material, primarily used for efficient power conversion and signal processing. Compared to traditional silicon switches, GaN switches have higher electron mobility, lower on-resistance, and higher voltage withstand capability, thus enabling their application in higher frequency and higher power scenarios. The push-pull inverter circuit provided in this embodiment, by employing a GaN switch and utilizing the excellent properties of gallium nitride material, allows the switching device to perform rapid switching operations, enabling the circuit to be used in ultra-high frequency scenarios exceeding 4MHz.

[0038] The first gallium nitride switch 121 refers to the switching device in the first switching module 120. The second gallium nitride switch 131 refers to the switching device in the second switching module 130. The source refers to one pin of the gallium nitride switch, which is typically used to introduce current and provide a stable voltage reference for the device. The drain refers to the other pin of the gallium nitride switch, which is responsible for collecting the current flowing from the source and transferring it to the load or other components of the circuit.

[0039] In this embodiment, the gallium nitride (GaN) switch has a low gate charge and low drain-source junction capacitance, which reduces the drive and switching losses at high frequencies. Soft switching is achieved using the resonant network 140, controlling the first GaN switch 121 and the second GaN switch 131 to conduct when the voltage level is zero, enabling the push-pull inverter circuit to operate at ultra-high frequencies (above 4MHz). Furthermore, compared to push-pull inverter circuits provided by related technologies, the push-pull inverter circuit provided in this embodiment employs soft-switching technology, resulting in virtually no voltage spikes across the GaN devices. Therefore, an RC snubber network is unnecessary, and its board area is reduced by at least 30% compared to push-pull inverter circuits of related technologies.

[0040] In some embodiments, Figure 3 is a temperature test result diagram of the push-pull inverter circuit of the related technology provided in the embodiments of this application. Figure 4 is a temperature test result diagram of the push-pull inverter circuit provided in the embodiments of this application. As shown in Figures 3 and 4, the input interface V of the push-pull inverter circuit of the related technology and the embodiments of this application... DC All circuits are connected to a 12V DC voltage and have a switching frequency of 4MHz. The temperature of the push-pull inverter circuit provided in this embodiment is more than 50 degrees Celsius lower than that of traditional silicon device solutions. This is because the use of gallium nitride devices and resonant soft switching greatly reduces the losses of the push-pull inverter circuit at high frequencies, allowing the switching devices to operate at lower temperatures, thus improving the reliability and lifespan of the circuit.

[0041] In this embodiment, the resonant network 140 enables the switching devices of the push-pull inverter circuit to be turned off when the voltage is zero; by using gallium nitride (GaN) switches, the push-pull inverter circuit can be used in scenarios exceeding 4MHz. This solution reduces transient voltage and current spikes during the switching process of the switching module, improving the overall energy conversion efficiency of the push-pull inverter circuit; at the same time, it reduces the board area and transformer volume of the push-pull inverter circuit, increases the operating frequency of the push-pull inverter circuit, and enables the circuit to operate in scenarios above 4MHz.

[0042] Optionally, based on the above embodiments and continuing to refer to FIG2, the resonant network 140 may include: a first frequency modulation unit, the first frequency modulation unit being connected to the input interface V. DCBetween the center tap 112 of the primary coil 111; a first energy storage unit, the first energy storage unit being connected between the first end and the second end of the first switch module 120; a second energy storage unit, the second energy storage unit being connected between the first end and the second end of the second switch module 130.

[0043] The first frequency modulation unit refers to the unit in the resonant network 140 used to adjust the resonant frequency. When current flows through the first frequency modulation unit, a magnetic field is generated and energy is stored. This energy can be released when the current changes, thereby affecting the working state of the circuit.

[0044] In some embodiments, the first energy storage unit refers to a unit in the resonant network 140 used for storing energy. When current flows into the first energy storage unit, charge accumulates and an electric field is formed, thereby storing energy. The stored electrical energy is released when the current changes, affecting the behavior of the resonant network 140. The second energy storage unit refers to another unit in the resonant network 140 used for storing energy. When current flows into the second energy storage unit, charge accumulates and an electric field is formed, thereby storing energy. The stored electrical energy is released when the current changes, further affecting the behavior of the resonant network 140.

[0045] In this embodiment, the first frequency modulation unit, the first energy storage unit, and the second energy storage unit jointly determine the resonant frequency of the resonant network 140. By adjusting the parameters of the components in the first frequency modulation unit, the first energy storage unit, and the second energy storage unit, flexible control of the resonant frequency can be achieved.

[0046] Optionally, based on the above embodiments and referring to Figure 2, the first frequency modulation unit includes a first inductor L21, which is connected to the input interface V. DC Between the center tap 112 of the primary coil 111; the first energy storage unit includes a first capacitor C21, which is connected between the first and second terminals of the first switching module 120; the second energy storage unit includes a second capacitor C22, which is connected between the first and second terminals of the second switching module 130.

[0047] In some embodiments, the first inductor L21 refers to the inductor element in the first frequency modulation unit, responsible for storing and releasing energy when current flows, thereby affecting the frequency characteristics of the resonant network 140. When current flows through the first inductor L21, a magnetic field is generated around it. According to Faraday's law of electromagnetic induction, the inductor generates a reverse voltage to the change in current, affecting the flow of current. Interacting with the first capacitor C21 and the second capacitor C22, the alternating charging and discharging of the first inductor L21 and the capacitors form a resonance, enabling the circuit to operate efficiently at a specific frequency.

[0048] The first capacitor C21 refers to the capacitor element in the first energy storage unit, responsible for storing electrical energy in the electric field and releasing the stored energy when the current changes. When current flows through the first capacitor C21, the capacitor charges; when the circuit needs energy, the first capacitor C21 discharges, providing the required electrical energy. This process alternates with the energy storage and release of the first inductor L21, forming a resonance.

[0049] The second capacitor C22 refers to the capacitor element in the second energy storage unit, responsible for storing electrical energy in the electric field and releasing the stored energy when the current changes. When current flows through the second capacitor C22, the capacitor charges; when the circuit needs energy, the second capacitor C22 discharges to provide the required electrical energy. This process alternates with the energy storage and release of the first inductor L21, forming a resonance.

[0050] In this embodiment, the energy stored in the first inductor L21 forms a magnetic field within the inductor, while the first capacitor C21 and the second capacitor C22 store electrical energy in the electric field. Current and voltage alternate between the inductor and capacitor, forming a periodic oscillation. The resonant frequency is determined by the following formula:

[0051] Where f is the resonant frequency; L is the inductance of the first inductor L21; and C is the equivalent capacitance, which is the equivalent capacitance of the first capacitor C21 and the second capacitor C22.

[0052] In this embodiment, the resonant network 140 is formed by the alternating storage and release of energy in the inductor and capacitor, thereby realizing the soft switching of the push-pull inverter circuit. This enables the switching device to be turned off when the voltage is zero, effectively reducing transient voltage and current spikes during the switching process of the switching module and improving the overall energy conversion efficiency of the push-pull inverter circuit.

[0053] Figure 5 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application. Based on the above embodiment, as shown in Figure 5, optionally, the resonant network 140 may further include: a second frequency modulation unit, which is connected between the secondary coil 113 and the load 150, and is used to form resonance with the first frequency modulation unit, the first energy storage unit and the second energy storage unit.

[0054] The second frequency modulation unit refers to another unit in the resonant network 140 used to adjust the resonant frequency. When current flows through the second frequency modulation unit, a magnetic field is generated and energy is stored. This energy can be released when the current changes, thereby affecting the working state of the circuit.

[0055] Optionally, based on the above embodiments, referring to FIG5, the second frequency modulation unit may include: a second inductor L22, the second inductor L22 being connected between the secondary coil 113 and the load 150, and the second inductor L22 being used to form resonance with the first inductor L21, the first capacitor C21 and the second capacitor C22.

[0056] In some embodiments, the second inductor L22 refers to the inductor element in the second frequency modulation unit, responsible for storing and releasing energy when current flows, thereby affecting the frequency characteristics of the resonant network 140. When current flows through the second inductor L22, a magnetic field is generated around it. According to Faraday's law of electromagnetic induction, the inductor generates a reverse voltage to the change in current, affecting the flow of current. Interacting with the first capacitor C21 and the second capacitor C22, the alternating charging and discharging of the first inductor L21 and the second inductor L22 with the capacitors forms a resonance, enabling the circuit to operate efficiently at a specific frequency.

[0057] In this embodiment, adding a second inductor L22 to the secondary coil 113 can smooth the current flowing to the load 150, reduce current ripple, and protect the safety of the push-pull inverter circuit and the load 150.

[0058] The energy stored in the first inductor L21 and the second inductor L22 forms a magnetic field within the inductors, while the first capacitor C21 and the second capacitor C22 store electrical energy in the electric field. Current and voltage alternate between the inductors and capacitors, creating periodic oscillations. The resonant frequency is determined by the following formula:

[0059] Where f1 is the generated resonant frequency; L1 is the equivalent inductance, that is, the equivalent inductance of the first inductor L21 and the second inductor L22; C is the equivalent capacitance, that is, the equivalent capacitance of the first capacitor C21 and the second capacitor C22.

[0060] In this embodiment, the resonant network 140 is formed by the alternating storage and release of energy in the inductor and capacitor, thereby realizing the soft switching of the push-pull inverter circuit. This enables the switching device to be turned off when the voltage is zero, effectively reducing transient voltage and current spikes during the switching process of the switching module and improving the overall energy conversion efficiency of the push-pull inverter circuit.

[0061] Optionally, based on the above embodiments and referring to Figure 5, the push-pull inverter circuit further includes: a third energy storage module 170, which is connected to the input interface V. DC Between the ground terminal and the first switch module 120, the third energy storage module 170 is used to transfer the input interface V when the first switch module 120 and the second switch module 130 perform switching operations. DC The input DC signal is temporarily stored.

[0062] The third energy storage module 170 refers to an electronic component that stores electrical energy during the switching process of the switching module, ensuring the stability of the power supply when the switching state changes. The third energy storage module 170 can act as a buffer during switching operations, avoiding the impact of instantaneous current changes on the circuit and improving the reliability of the system.

[0063] Optionally, based on the above embodiments, referring to Figure 5, the third energy storage module 170 includes: a third capacitor C23, which is connected to the input interface V. DC Between the input interface V and the ground terminal, the third capacitor C23 is used to transfer the input interface V during each switching action of the first switching module 120 and the second switching module 130. DC The input DC signal is temporarily stored.

[0064] In some embodiments, the third capacitor C23 refers to the capacitor connected to the input interface V. DC The capacitor between the ground terminal and the first switch module 120 is mainly used to temporarily store the input interface V when the first switch module 120 and the second switch module 130 perform switching operations. DC The input DC signal. When the input interface V DC When a DC signal is provided, the third capacitor C23 charges, storing the input electrical energy, ready to be released when needed. When the first switch module 120 and the second switch module 130 perform switching operations, the third capacitor C23 releases the stored electrical energy to ensure that the voltage and current of the push-pull inverter circuit remain stable during the switching process.

[0065] In this embodiment, the third capacitor C23 smooths the fluctuations in the input voltage, reduces transient current changes during the switching process, thereby reducing switching losses and improving the overall system energy efficiency.

[0066] Figure 6 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application. Based on the above embodiments, as shown in Figure 6, optionally, the push-pull inverter circuit further includes: a drive module 180, which is connected to the control terminal of the first switch module 120 and the control terminal of the second switch module 130, and the drive module 180 is configured to drive the first switch module 120 and the second switch module 130 to conduct.

[0067] In some embodiments, the drive module 180 refers to the circuit component in the push-pull inverter circuit that controls and drives the conduction state of the switching module, thereby optimizing power conversion by providing appropriate drive signals to ensure the efficient and reliable operation of the switching module.

[0068] Figure 7 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application. Figure 8 is a schematic diagram of another push-pull inverter circuit provided in an embodiment of this application. Based on the above embodiments, optionally, referring to Figure 7, the drive module 180 may include a first drive unit 181 and a second drive unit 182; the first drive unit 181 is connected to the control terminal of the first switch module 120, and the first drive unit 181 is configured to drive the first switch module 120 to conduct according to a first control signal; the second drive unit 182 is connected to the control terminal of the second switch module 130, and the second drive unit 182 is configured to drive the second switch module 130 to conduct according to a second control signal. Alternatively, in another optional implementation, referring to Figure 8, the drive module 180 may include a third drive unit 183; the first end of the third drive unit 183 is connected to the control terminal of the first switch module 120, and the second end of the third drive unit 183 is connected to the control terminal of the second switch module 130, and the third drive unit 183 is configured to drive the first switch module 120 and the second switch module 130 to conduct according to the first control signal and the second control signal.

[0069] In some embodiments, the first driving unit 181 refers to a driving unit that controls the first switch module 120 to be turned on. The second driving unit 182 refers to a driving unit that controls the second switch module 130 to be turned on. The third driving unit 183 refers to a driving unit that can simultaneously control the first switch module 120 and the second switch module 130 to be turned on.

[0070] In this embodiment, the first driving unit 181 and the second driving unit 182 are each responsible for controlling the conduction of one switching module, which has the advantages of high accuracy and strong targeting. The third driving unit 183 can simultaneously drive the conduction state of the first switching module 120 and the second switching module 130 according to the first control signal and the second control signal. This design can simplify the circuit structure, reduce the number of components, and improve the system integration.

[0071] Based on the above embodiments, referring to Figures 7 and 8, optionally, when the drive module 180 includes two drive units, the first switch module 120 and the first drive unit 181 are packaged with multiple components or integrated on a single chip, and the second switch module 130 and the second drive unit 182 are packaged with multiple components or integrated on a single chip; when the drive module 180 includes a single drive unit, the first switch module 120, the second switch module 130 and the third drive unit 183 are packaged with multiple components or integrated on a single chip.

[0072] Optionally, multi-device co-packaging refers to a technology that encapsulates multiple independent devices onto a single substrate, and then packages this substrate into a single electronic assembly. These multiple independent devices can be multiple unpackaged bare dies, multiple packaged devices, or a hybrid of multiple unpackaged bare dies and multiple packaged devices. Compared to individual devices, multi-device co-packaging technology has lower parasitic parameters, smaller size, is easier to implement, and has lower cost. Single-chip integration refers to a technology that integrates multiple circuits onto the same substrate. Single-chip integration technology has the advantages of extremely high integration density, extremely low parasitic parameters, and extremely low power consumption.

[0073] In this embodiment, referring to FIG7, the first switch module 120 and the first drive unit 181 are packaged to form a first package layer IG1; the second switch module 130 and the second drive unit 182 are packaged to form a second package layer IG2. Alternatively, referring to FIG8, the first switch module 120, the second switch module 130, and the third drive unit 183 are packaged to form a third package layer IG3.

[0074] In this embodiment, the driving unit and the switching module are integrated and packaged by means of multi-device co-packaging or single-chip integration, which effectively reduces the gate parasitic parameters of the switching module, simplifies the layout of the circuit board, and thus suppresses the gate oscillation that may occur during fast switching.

[0075] Based on the above embodiments, referring to Figure 6, optionally, the push-pull inverter circuit may further include: a control module 190, which is connected to the drive module 180 and is configured to generate a first control signal and a second control signal according to drive requirements.

[0076] Optionally, control module 190 refers to the module that generates control signals in the push-pull inverter circuit. For example, control module 190 may be a PWM control module.

[0077] In this embodiment, the control module 190 can generate control signals according to the operating requirements of the push-pull inverter circuit to adjust the working state of the drive module 180 and the switching module.

[0078] This application also provides a high-frequency power supply device, including: the push-pull inverter circuit provided in any of the above embodiments, which can perform the functions of the corresponding push-pull inverter circuit and has the corresponding beneficial effects.

Claims

1. A push-pull inverter circuit, comprising: The input interface is configured to input DC signals. A transformer module, wherein the center tap of the primary winding of the transformer module is connected to the input interface, and the secondary winding of the transformer module is configured to connect to the load; The first switch module is connected between the first end of the primary coil and the ground end, and the control end of the first switch module is set to input the first control signal. The second switch module is connected between the second end of the primary coil and the ground end, and the control end of the second switch module is set to input a second control signal. A resonant network is connected to the primary coil, the first switching module, and the second switching module. The resonant network is configured to control the soft switching of the first switching module according to the first control signal and to control the soft switching of the second switching module according to the second control signal.

2. The push-pull inverter circuit according to claim 1, wherein, The first end of the resonant network is connected to the input interface, the second end of the resonant network is connected to the center tap, the third end of the resonant network is connected to the first end of the first switch module, the fourth end of the resonant network is connected to the second end of the first switch module, the fifth end of the resonant network is connected to the first end of the second switch module, and the sixth end of the resonant network is connected to the second end of the second switch module. The resonant network is configured to control the first switch module to turn on according to the first control signal when the voltage between the second terminal and the first terminal of the first switch module is zero; and to control the second switch module to turn on according to the second control signal when the voltage between the second terminal and the first terminal of the second switch module is zero.

3. The push-pull inverter circuit according to claim 1, wherein, The first switching module includes a first gallium nitride switching transistor; The second switching module includes a second gallium nitride switch; The resonant network is configured to control the first gallium nitride switch to turn on according to the first control signal when the voltage between the drain and source of the first gallium nitride switch is zero. When the voltage between the drain and source of the second gallium nitride switch is zero, the second gallium nitride switch is turned on according to the second control signal.

4. The push-pull inverter circuit according to any one of claims 1 to 3, wherein, The resonant network includes: A first frequency modulation unit is connected between the input interface and the center tap of the primary coil; The first energy storage unit is connected between the first terminal and the second terminal of the first switch module; The second energy storage unit is connected between the first end and the second end of the second switching module.

5. The push-pull inverter circuit according to claim 4, wherein, The first frequency modulation unit includes a first inductor, which is connected between the input interface and the center tap of the primary coil; The first energy storage unit includes a first capacitor, which is connected between the first terminal and the second terminal of the first switching module; The second energy storage unit includes a second capacitor, which is connected between the first terminal and the second terminal of the second switching module.

6. The push-pull inverter circuit according to claim 5, wherein, The resonant network further includes: The second frequency modulation unit is connected between the secondary coil and the load, and the second frequency modulation unit is configured to resonate with the first frequency modulation unit, the first energy storage unit and the second energy storage unit.

7. The push-pull inverter circuit according to claim 6, wherein, The second frequency modulation unit includes: The second inductor is connected between the secondary coil and the load, and the second inductor is configured to resonate with the first inductor, the first capacitor and the second capacitor.

8. The push-pull inverter circuit according to any one of claims 1 to 3, further comprising: The third energy storage module is connected between the input interface and the ground terminal. The third energy storage module is configured to temporarily store the DC signal input from the input interface when the first switch module and the second switch module perform switching actions.

9. The push-pull inverter circuit according to claim 8, wherein, The third energy storage module includes: The third capacitor is connected between the input interface and the ground terminal. The third capacitor is configured to temporarily store the DC signal input to the input interface each time the first switch module and the second switch module perform a switching action.

10. The push-pull inverter circuit according to claim 1, further comprising: A drive module is connected to the control terminal of the first switch module and the control terminal of the second switch module, and the drive module is configured to drive the first switch module and the second switch module to conduct.

11. The push-pull inverter circuit according to claim 10, wherein, The driving module includes a first driving unit and a second driving unit; the first driving unit is connected to the control terminal of the first switch module and is configured to drive the first switch module to conduct according to the first control signal; the second driving unit is connected to the control terminal of the second switch module and is configured to drive the second switch module to conduct according to the second control signal. Alternatively, the driving module includes a third driving unit; the first end of the third driving unit is connected to the control end of the first switch module, the second end of the third driving unit is connected to the control end of the second switch module, and the third driving unit is configured to drive the first switch module and the second switch module to conduct according to the first control signal and the second control signal.

12. The push-pull inverter circuit according to claim 11, wherein, When the drive module includes two drive units, the first switch module and the first drive unit are packaged with multiple components or integrated with a single chip, and the second switch module and the second drive unit are packaged with multiple components or integrated with a single chip. When the driving module includes a single driving unit, the first switch module, the second switch module, and the third driving unit are packaged as multiple devices or integrated on a single chip.

13. The push-pull inverter circuit according to any one of claims 10 to 12, further comprising: A control module is connected to the drive module, and the control module is configured to generate the first control signal and the second control signal according to the drive requirements.

14. A high-frequency power supply device, comprising: The push-pull inverter circuit according to any one of claims 1 to 13.

Images