Soft switching resonant conversion circuit without dead zone setting

Abstract

The invention provides a soft switching resonant conversion circuit without dead zone setting, belongs to the technical field of power electronic power conversion, and aims to solve the problem that a resonant conversion circuit in the prior art is difficult to meet high-frequency application due to the influence of dead zone setting. The circuit comprises an inversion unit, a resonance unit and a rectification unit which are connected in sequence. The input end of the inversion unit is connected with a power supply. The output end of the rectification unit is connected with a load. Dead time does not need to be set for the switch tube, and the method is more suitable for high-frequency application scenes; in addition, the invention has stronger boosting capability, and is more suitable for application scenarios requiring high step-up ratio.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic power conversion, and more particularly to a soft switching resonant conversion circuit without dead zone setting. Background Art

[0002] High-frequency design is an effective way to improve the power density of power electronic converters. To overcome the increased switching losses associated with high-frequency operation, soft-switching techniques are often employed simultaneously. Among various soft-switching techniques, resonant soft switching is the most common. However, existing resonant converter circuits are generally based on half-bridge or full-bridge structures, such as series resonant circuits, parallel resonant circuits, series-parallel resonant circuits, and LLC resonant circuits. To prevent simultaneous conduction of the upper and lower switches in a half-bridge or full-bridge resonant circuit, a dead-time is added to the control signals of the upper and lower switches. For applications with very high switching frequencies, a dead-time that is too long can severely impact converter performance, while a dead-time that is too short can create the risk of shoot-through. Overall, while existing soft-switching techniques help reduce switching losses in power electronic converters, the dead-time setting still restricts the development of higher-frequency converters. Summary of the Invention

[0003] In order to overcome the defect that the resonant conversion circuit in the above-mentioned prior art is affected by the dead zone setting and is difficult to meet high-frequency applications, the present invention provides a soft-switching resonant conversion circuit without dead zone setting, which does not require setting dead zone time for the switching tube and is more suitable for high-frequency application scenarios; in addition, the present invention has stronger boosting capability and is more suitable for application scenarios requiring a high boost ratio.

[0004] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0005] A soft-switching resonant conversion circuit without dead zone setting comprises: an inverter unit, a resonant unit and a rectifier unit connected in sequence; the input end of the inverter unit is connected to a power supply, and the output end of the rectifier unit is connected to a load.

[0006] Preferably, the inverter unit includes: a first inductor L1, a second inductor L2, a first switch tube S1 and a second switch tube S2;

[0007] One end of the first inductor L1 is connected to one end of the second inductor L2 and serves as the first input end of the inverter unit; the source of the first switching transistor S1 is connected to the source of the second switching transistor S1 and serves as the second input end of the inverter unit; the other end of the first inductor L1 is connected to the drain of the first switching transistor S1 and serves as the first output end of the inverter unit; the other end of the second inductor L2 is connected to the drain of the second switching transistor S2 and serves as the second output end of the inverter unit; the gate of the first switching transistor S1 and the gate of the second switching transistor S2 serve as input ends of a control signal, used to control the conduction and shutdown of the first switching transistor S1 and the second switching transistor S2;

[0008] The first input end and the second input end of the inverter unit are respectively connected to the two ends of the power supply; the first output end and the second output end of the inverter unit are respectively connected to the resonance unit.

[0009] Preferably, the first switch tube S1 and the second switch tube S2 in the inverter unit are both N-channel MOS tubes.

[0010] Preferably, the first switch S1 and the second switch S2 are alternately turned on with a duty cycle of 0.5, and no dead time is set between the control signals of the first switch S1 and the second switch S2.

[0011] Preferably, the voltage across the load is adjusted by changing the switching frequency of the first switch tube S1 and the second switch tube S2.

[0012] Preferably, the resonant unit includes: a capacitor Cs, a capacitor Cp and a resonant inductor Lr;

[0013] The two ends of the resonant inductor Lr are respectively connected to one end of the capacitor Cs and one end of the capacitor Cp, and the other end of the capacitor Cs is connected to the other end of the capacitor Cp; the two ends of the capacitor Cs serve as the first input end and the second input end of the resonant unit respectively; the two ends of the capacitor Cp serve as the first output end and the second output end of the resonant unit respectively;

[0014] The first output end and the second output end of the inversion unit are connected to the first input end and the second input end of the resonance unit respectively; the first output end and the second output end of the resonance unit are connected to the rectification unit respectively.

[0015] Preferably, the rectifier unit is a full-bridge rectifier circuit, comprising: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a filter capacitor Co;

[0016] The anode of the first diode D1 is connected to the cathode of the second diode D2 and serves as the first input terminal of the rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and serves as the second input terminal of the rectifier unit; the cathode of the first diode D1 is connected to the cathode of the third diode D3 and one end of the filter capacitor Co, respectively, and serves as the first output terminal of the rectifier unit; the anode of the second diode D2 is connected to the anode of the fourth diode D4 and the other end of the filter capacitor Co, respectively, and serves as the second output terminal of the rectifier unit;

[0017] The first input end and the second input end of the rectifier unit are respectively connected to the first output end and the second output end of the resonance unit; the first output end and the second output end of the rectifier unit are respectively connected to the two ends of the load.

[0018] Preferably, the rectifier unit is a half-bridge rectifier circuit, comprising: a fifth diode D5, a sixth diode D6, a filter capacitor Co1 and a filter capacitor Co2;

[0019] The anode of the fifth diode D5 and the cathode of the sixth diode D6 are connected and serve as the first input terminal of the rectifier unit, one end of the filter capacitor Co1 and one end of the filter capacitor Co2 are connected and serve as the second input terminal of the rectifier unit; the cathode of the fifth diode D5 and the other end of the filter capacitor Co1 are connected and serve as the first output terminal of the rectifier unit; the anode of the sixth diode D6 and the other end of the filter capacitor Co2 are connected and serve as the second output terminal of the rectifier unit;

[0020] The first input end and the second input end of the rectifier unit are respectively connected to the first output end and the second output end of the resonance unit; the first output end and the second output end of the rectifier unit are respectively connected to the two ends of the load.

[0021] Preferably, the circuit further comprises a high-frequency transformer;

[0022] The primary winding of the high-frequency transformer is connected to the output end of the resonant unit, and the secondary winding of the high-frequency transformer is connected to the input end of the rectifier unit.

[0023] Preferably, the power supply is a DC voltage source.

[0024] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0025] The present invention provides a soft-switching resonant conversion circuit without a dead-zone setting, comprising an inverter unit, a resonant unit, and a rectifier unit connected in sequence; the input end of the inverter unit is connected to a power supply, and the output end of the rectifier unit is connected to a load; the present invention does not require setting a dead-zone time for the switch tube, and is more suitable for high-frequency application scenarios; in addition, the present invention has a stronger boosting capability and is more suitable for application scenarios requiring a high boost ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a soft-switching resonant conversion circuit without dead zone setting provided in Example 1.

[0027] Figure 2 This is a structural diagram of the full-bridge rectifier circuit provided in Example 1.

[0028] Figure 3 This is a structural diagram of the half-bridge rectifier circuit provided in Example 1.

[0029] Figure 4 This is a specific structural diagram of a soft-switching resonant conversion circuit without dead-zone setting provided in Example 2.

[0030] Figure 5 This is a schematic diagram of the operating state of the soft-switching resonant conversion circuit without dead zone setting provided in Example 2.

[0031] Figure 6 This is a structural diagram of another soft-switching resonant conversion circuit without dead zone provided in Example 3. DETAILED DESCRIPTION

[0032] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting the present application;

[0033] In order to better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size;

[0034] It is understandable to those skilled in the art that some well-known structures and descriptions thereof may be omitted in the drawings.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a soft-switching resonant conversion circuit without a dead zone setting, comprising: an inverter unit, a resonant unit, and a rectifier unit connected in sequence; the input end of the inverter unit is connected to a power supply, and the output end of the rectifier unit is connected to a load;

[0038] The inverter unit includes: a first inductor L1, a second inductor L2, a first switch tube S1 and a second switch tube S2; the first switch tube S1 and the second switch tube S2 in the inverter unit are both N-channel MOS tubes;

[0039] One end of the first inductor L1 is connected to one end of the second inductor L2 and serves as the first input end of the inverter unit; the source of the first switching transistor S1 is connected to the source of the second switching transistor S1 and serves as the second input end of the inverter unit; the other end of the first inductor L1 is connected to the drain of the first switching transistor S1 and serves as the first output end of the inverter unit; the other end of the second inductor L2 is connected to the drain of the second switching transistor S2 and serves as the second output end of the inverter unit; the gate of the first switching transistor S1 and the gate of the second switching transistor S2 serve as input ends of a control signal, used to control the conduction and shutdown of the first switching transistor S1 and the second switching transistor S2;

[0040] The first input terminal and the second input terminal of the inverter unit are respectively connected to the two ends of the power supply; the first output terminal and the second output terminal of the inverter unit are respectively connected to the resonance unit;

[0041] The resonant unit includes: a capacitor Cs, a capacitor Cp and a resonant inductor Lr;

[0042] The two ends of the resonant inductor Lr are respectively connected to one end of the capacitor Cs and one end of the capacitor Cp, and the other end of the capacitor Cs is connected to the other end of the capacitor Cp; the two ends of the capacitor Cs serve as the first input end and the second input end of the resonant unit respectively; the two ends of the capacitor Cp serve as the first output end and the second output end of the resonant unit respectively;

[0043] The first output end and the second output end of the inverter unit are respectively connected to the first input end and the second input end of the resonance unit; the first output end and the second output end of the resonance unit are respectively connected to the rectification unit;

[0044] When the rectifier unit is a full-bridge rectifier circuit, it includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a filter capacitor Co;

[0045] The anode of the first diode D1 is connected to the cathode of the second diode D2 and serves as the first input terminal of the rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and serves as the second input terminal of the rectifier unit; the cathode of the first diode D1 is connected to the cathode of the third diode D3 and one end of the filter capacitor Co, respectively, and serves as the first output terminal of the rectifier unit; the anode of the second diode D2 is connected to the anode of the fourth diode D4 and the other end of the filter capacitor Co, respectively, and serves as the second output terminal of the rectifier unit;

[0046] The first input terminal and the second input terminal of the rectifier unit are respectively connected to the first output terminal and the second output terminal of the resonant unit; the first output terminal and the second output terminal of the rectifier unit are respectively connected to the two ends of the load;

[0047] When the rectifier unit is a half-bridge rectifier circuit, it includes: a fifth diode D5, a sixth diode D6, a filter capacitor Co1 and a filter capacitor Co2;

[0048] The anode of the fifth diode D5 and the cathode of the sixth diode D6 are connected and serve as the first input terminal of the rectifier unit, one end of the filter capacitor Co1 and one end of the filter capacitor Co2 are connected and serve as the second input terminal of the rectifier unit; the cathode of the fifth diode D5 and the other end of the filter capacitor Co1 are connected and serve as the first output terminal of the rectifier unit; the anode of the sixth diode D6 and the other end of the filter capacitor Co2 are connected and serve as the second output terminal of the rectifier unit;

[0049] The first input terminal and the second input terminal of the rectifier unit are respectively connected to the first output terminal and the second output terminal of the resonant unit; the first output terminal and the second output terminal of the rectifier unit are respectively connected to the two ends of the load;

[0050] The power supply is specifically a DC voltage source.

[0051] In the specific implementation process, the soft switching resonant conversion circuit proposed in this embodiment without dead zone setting is as follows: Figure 1 As shown, the circuit consists of an inverter unit, a resonant unit and a rectifier unit, which is used to convert the DC power supply voltage V in Converted into DC output voltage V o And supply power to the load Ro;

[0052] Specifically, the inverter unit includes: a first inductor L1, a second inductor L2, a first switch tube S1, and a second switch tube S2; the first switch tube S1 and the second switch tube S2 in the inverter unit are both N-channel MOS tubes; one end of the first inductor L1 is connected to one end of the second inductor L2 and serves as a first input end of the inverter unit; the source of the first switch tube S1 is connected to the source of the second switch tube S1 and serves as a second input end of the inverter unit; the other end of the first inductor L1 is connected to the drain of the first switch tube S1 and serves as a first output end of the inverter unit; the other end of the second inductor L2 is connected to the drain of the second switch tube S2 and serves as a second output end of the inverter unit; the gate of the first switch tube S1 and the gate of the second switch tube S2 serve as input ends of a control signal for controlling the on and off of the first switch tube S1 and the second switch tube S2; the first input end and the second input end of the inverter unit are respectively connected to two ends of a power supply; the first output end and the second output end of the inverter unit are respectively connected to the resonant unit;

[0053] The resonant unit includes: a capacitor Cs, a capacitor Cp, and a resonant inductor Lr; two ends of the resonant inductor Lr are respectively connected to one end of the capacitor Cs and one end of the capacitor Cp, and the other end of the capacitor Cs is connected to the other end of the capacitor Cp; two ends of the capacitor Cs serve as the first input end and the second input end of the resonant unit respectively; two ends of the capacitor Cp serve as the first output end and the second output end of the resonant unit respectively; the first output end and the second output end of the inverter unit are respectively connected to the first input end and the second input end of the resonant unit; the first output end and the second output end of the resonant unit are respectively connected to the rectifier unit;

[0054] In this embodiment, the rectifier unit can have two specific circuits, wherein the first is a full-bridge rectifier circuit, including a rectifier composed of four diodes and an output filter capacitor; the second is a half-bridge rectifier circuit, including a half-bridge composed of two diodes and two series output filter capacitors;

[0055] like Figure 2 As shown, when the rectifier unit is a full-bridge rectifier circuit, it includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a filter capacitor Co; the anode of the first diode D1 is connected to the cathode of the second diode D2 and serves as the first input terminal of the rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and serves as the second input terminal of the rectifier unit; the cathode of the first diode D1 is respectively connected to the cathode of the third diode D3 and one end of the filter capacitor Co, and serves as the first output terminal of the rectifier unit; the anode of the second diode D2 is respectively connected to the anode of the fourth diode D4 and the other end of the filter capacitor Co, and serves as the second output terminal of the rectifier unit;

[0056] like Figure 3 As shown, when the rectifier unit is a half-bridge rectifier circuit, it includes: a fifth diode D5, a sixth diode D6, a filter capacitor Co1 and a filter capacitor Co2; the anode of the fifth diode D5 and the cathode of the sixth diode D6 are connected and serve as the first input terminal of the rectifier unit, one end of the filter capacitor Co1 and one end of the filter capacitor Co2 are connected and serve as the second input terminal of the rectifier unit; the cathode of the fifth diode D5 and the other end of the filter capacitor Co1 are connected and serve as the first output terminal of the rectifier unit; the anode of the sixth diode D6 and the other end of the filter capacitor Co2 are connected and serve as the second output terminal of the rectifier unit;

[0057] The first input end and the second input end of the rectifier unit are respectively connected to the first output end and the second output end of the resonance unit; the first output end and the second output end of the rectifier unit are respectively connected to the two ends of the load;

[0058] Compared with the existing soft-switching resonant converter based on half-bridge or full-bridge structure, the soft-switching resonant converter proposed in this embodiment does not require setting a dead zone for the switching tube, so it is more suitable for high-frequency application scenarios; at the same time, this circuit has a stronger boost capability, so it is more suitable for application scenarios requiring a high boost ratio.

[0059] Example 2

[0060] like Figure 4 As shown, this embodiment provides a soft-switching resonant conversion circuit without a dead zone setting, comprising: an inverter unit, a resonant unit, and a rectifier unit connected in sequence; the input end of the inverter unit is connected to a power supply, and the output end of the rectifier unit is connected to a load;

[0061] The inverter unit includes: a first inductor L1, a second inductor L2, a first switch tube S1 and a second switch tube S2; the first switch tube S1 and the second switch tube S2 in the inverter unit are both N-channel MOS tubes;

[0062] The first switch S1 and the second switch S2 are alternately turned on at a duty cycle of 0.5, and no dead time is set between the control signals of the first switch S1 and the second switch S2; the voltage across the load is adjusted by changing the switching frequency of the first switch S1 and the second switch S2;

[0063] One end of the first inductor L1 is connected to one end of the second inductor L2 and serves as the first input end of the inverter unit; the source of the first switching transistor S1 is connected to the source of the second switching transistor S1 and serves as the second input end of the inverter unit; the other end of the first inductor L1 is connected to the drain of the first switching transistor S1 and serves as the first output end of the inverter unit; the other end of the second inductor L2 is connected to the drain of the second switching transistor S2 and serves as the second output end of the inverter unit; the gate of the first switching transistor S1 and the gate of the second switching transistor S2 serve as input ends of a control signal, used to control the conduction and shutdown of the first switching transistor S1 and the second switching transistor S2;

[0064] The first input terminal and the second input terminal of the inverter unit are respectively connected to the two ends of the power supply; the first output terminal and the second output terminal of the inverter unit are respectively connected to the resonance unit;

[0065] The resonant unit includes: a capacitor Cs, a capacitor Cp and a resonant inductor Lr;

[0066] The two ends of the resonant inductor Lr are respectively connected to one end of the capacitor Cs and one end of the capacitor Cp, and the other end of the capacitor Cs is connected to the other end of the capacitor Cp; the two ends of the capacitor Cs serve as the first input end and the second input end of the resonant unit respectively; the two ends of the capacitor Cp serve as the first output end and the second output end of the resonant unit respectively;

[0067] The first output end and the second output end of the inverter unit are respectively connected to the first input end and the second input end of the resonance unit; the first output end and the second output end of the resonance unit are respectively connected to the rectification unit;

[0068] The rectifier unit is a full-bridge rectifier circuit, including: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a filter capacitor Co;

[0069] The anode of the first diode D1 is connected to the cathode of the second diode D2 and serves as the first input terminal of the rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and serves as the second input terminal of the rectifier unit; the cathode of the first diode D1 is connected to the cathode of the third diode D3 and one end of the filter capacitor Co, respectively, and serves as the first output terminal of the rectifier unit; the anode of the second diode D2 is connected to the anode of the fourth diode D4 and the other end of the filter capacitor Co, respectively, and serves as the second output terminal of the rectifier unit;

[0070] The first input terminal and the second input terminal of the rectifier unit are respectively connected to the first output terminal and the second output terminal of the resonant unit; the first output terminal and the second output terminal of the rectifier unit are respectively connected to the two ends of the load;

[0071] The power supply is specifically a DC voltage source.

[0072] In the specific implementation process, Figure 5 As shown, when the circuit in this embodiment is working, the switch tubes S1 and S2 are alternately turned on at a duty cycle of 0.5, and no dead time is required between the control signals of the first switch tube S1 and the second switch tube S2. The operation state of the entire circuit is as follows: Figure 5 The sequence shown switches automatically;

[0073] When the switch tube S1 is turned on and S2 is turned off, the inductor L1 is charged by the input power supply voltage Vin, and the currents of the inductor L2 and the resonant inductor Lr flow into the capacitor Cs at the same time, causing its voltage to increase from 0; since Cs is connected in parallel across S2 when S1 is turned on, S2 is turned off at zero voltage; during this process, the current of the resonant inductor Lr also flows to Co and the load, and gradually decreases until it reaches 0; then it turns from positive to negative and increases in the reverse direction, and the reverse current of the inductor Lr flows through the capacitor Cp, causing the voltage of Cp to gradually decrease from the negative maximum; when the current of Lr increases in the reverse direction to the same as the current of the inductor L2 After that, the capacitor Cs is fully charged and begins to discharge, its voltage gradually decreases, and the reverse current of the inductor Lr continues to increase; the capacitor Cp continues to be charged by the current of Lr, causing its voltage to turn from negative to positive and then continue to increase. When its amplitude increases to the output voltage, the rectifier circuit works, the Cp voltage is clamped to the output voltage, and the current of Lr flows to Co and the load; the capacitor Cs continues to discharge, causing its voltage to decrease. When its voltage drops to 0, the parallel diode of the switch tube S2 is turned on to continue the current, so that the voltage of Cs and the switch tube S2 remains at 0 until the switch tube S2 is turned on and S1 is turned off; therefore, S2 is turned on at zero voltage;

[0074] When the switch tube S2 is turned on and S1 is turned off, the inductor L2 is charged by the input power supply voltage Vin, and the currents of the inductor L1 and the resonant inductor Lr flow into the capacitor Cs at the same time, causing its voltage to increase in the opposite direction from 0. Since Cs is connected in parallel across S1 when S2 is turned on, S1 is turned off at zero voltage. During this process, the current of the resonant inductor Lr also flows to Co and the load, and gradually decreases until it reaches 0. Then it turns from negative to positive and gradually increases. The current of the inductor Lr flows through the capacitor Cp, causing the voltage of Cp to gradually decrease from the positive maximum. When the current of Lr increases to the same as the current of the inductor L1, , capacitor Cs completes reverse charging and begins to discharge, its voltage gradually decreases, and the current of inductor Lr continues to increase; capacitor Cp continues to be charged by the current of Lr, causing its voltage to change from positive to negative and then continue to increase. When its amplitude increases to the output voltage, the rectifier circuit works, Cp voltage is clamped to the output voltage, and Lr current flows to Co and the load; capacitor Cs continues to discharge, causing its voltage to decrease. When its voltage drops to 0, the parallel diode of switch tube S1 turns on and continues to flow, so that the voltage of Cs and switch tube S1 remains at 0 until switch tube S1 turns on and S2 turns off; therefore, S1 is turned on at zero voltage;

[0075] When switches S1 and S2 operate alternately at high frequency, the currents in inductors L1 and L2 charge and discharge alternately, minimizing the current ripple of the input power supply. Furthermore, switches S1 and S2, along with inductors L1 and L2, form an interleaved boost circuit, thus providing a voltage boost. This makes the proposed resonant converter circuit more capable of boosting voltage than traditional resonant converters. Furthermore, the resonant inductor Lr and capacitors Cp and Cs form a resonant network, which provides zero-voltage switching conditions for switches S1 and S2 and supplies energy to the output capacitor Co and the load through the rectifier circuit, resulting in stable DC power across the load.

[0076] Like traditional resonant converters (LLC, LCC, series resonant, etc.), the output voltage can be adjusted by changing the switching frequency of the switches S1 and S2 in the proposed conversion circuit, thereby playing the role of maintaining the output voltage stable when the load or input voltage converter is low.

[0077] The soft-switching resonant converter proposed in this embodiment does not require a dead zone to be set for the switch tube, and is therefore more suitable for high-frequency application scenarios; at the same time, this circuit has a stronger boost capability, and is therefore more suitable for application scenarios requiring a high boost ratio.

[0078] Example 3

[0079] like Figure 6 As shown, this embodiment provides another soft-switching resonant conversion circuit without dead zone setting, comprising: an inverter unit, a resonant unit, a high-frequency transformer, and a rectifier unit connected in sequence; the input end of the inverter unit is connected to a power supply, and the output end of the rectifier unit is connected to a load;

[0080] The inverter unit includes: a first inductor L1, a second inductor L2, a first switch tube S1 and a second switch tube S2; the first switch tube S1 and the second switch tube S2 in the inverter unit are both N-channel MOS tubes;

[0081] One end of the first inductor L1 is connected to one end of the second inductor L2 and serves as the first input end of the inverter unit; the source of the first switching transistor S1 is connected to the source of the second switching transistor S1 and serves as the second input end of the inverter unit; the other end of the first inductor L1 is connected to the drain of the first switching transistor S1 and serves as the first output end of the inverter unit; the other end of the second inductor L2 is connected to the drain of the second switching transistor S2 and serves as the second output end of the inverter unit; the gate of the first switching transistor S1 and the gate of the second switching transistor S2 serve as input ends of a control signal, used to control the conduction and shutdown of the first switching transistor S1 and the second switching transistor S2;

[0082] The first input terminal and the second input terminal of the inverter unit are respectively connected to the two ends of the power supply; the first output terminal and the second output terminal of the inverter unit are respectively connected to the resonance unit;

[0083] The resonant unit includes: a capacitor Cs, a capacitor Cp and a resonant inductor Lr;

[0084] The two ends of the resonant inductor Lr are respectively connected to one end of the capacitor Cs and one end of the capacitor Cp, and the other end of the capacitor Cs is connected to the other end of the capacitor Cp; the two ends of the capacitor Cs serve as the first input end and the second input end of the resonant unit respectively; the two ends of the capacitor Cp serve as the first output end and the second output end of the resonant unit respectively;

[0085] The first output end and the second output end of the inverter unit are respectively connected to the first input end and the second input end of the resonance unit; the first output end and the second output end of the resonance unit are respectively connected to the rectification unit;

[0086] When the rectifier unit is a full-bridge rectifier circuit, it includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a filter capacitor Co;

[0087] The anode of the first diode D1 is connected to the cathode of the second diode D2 and serves as the first input terminal of the rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and serves as the second input terminal of the rectifier unit; the cathode of the first diode D1 is connected to the cathode of the third diode D3 and one end of the filter capacitor Co, respectively, and serves as the first output terminal of the rectifier unit; the anode of the second diode D2 is connected to the anode of the fourth diode D4 and the other end of the filter capacitor Co, respectively, and serves as the second output terminal of the rectifier unit;

[0088] The first input terminal and the second input terminal of the rectifier unit are respectively connected to the first output terminal and the second output terminal of the resonant unit; the first output terminal and the second output terminal of the rectifier unit are respectively connected to the two ends of the load;

[0089] When the rectifier unit is a half-bridge rectifier circuit, it includes: a fifth diode D5, a sixth diode D6, a filter capacitor Co1 and a filter capacitor Co2;

[0090] The anode of the fifth diode D5 and the cathode of the sixth diode D6 are connected and serve as the first input terminal of the rectifier unit, one end of the filter capacitor Co1 and one end of the filter capacitor Co2 are connected and serve as the second input terminal of the rectifier unit; the cathode of the fifth diode D5 and the other end of the filter capacitor Co1 are connected and serve as the first output terminal of the rectifier unit; the anode of the sixth diode D6 and the other end of the filter capacitor Co2 are connected and serve as the second output terminal of the rectifier unit;

[0091] The first input terminal and the second input terminal of the rectifier unit are respectively connected to the first output terminal and the second output terminal of the resonant unit; the first output terminal and the second output terminal of the rectifier unit are respectively connected to the two ends of the load;

[0092] The power supply is specifically a DC voltage source.

[0093] In the specific implementation process, the circuit structure in this embodiment is basically the same as the circuit structure in Example 1, the only difference is that the circuit in this embodiment further includes a high-frequency transformer, and the primary winding of the high-frequency transformer ( Figure 6 n in p ) are connected to the first output terminal and the second output terminal of the resonant unit, and the secondary winding of the high-frequency transformer ( Figure 6 n in s ) is connected to the first input terminal and the second input terminal of the rectifier unit;

[0094] The soft-switching resonant converter proposed in this embodiment does not require a dead zone to be set for the switch tube, and is therefore more suitable for high-frequency application scenarios; at the same time, this circuit has a stronger boost capability, and is therefore more suitable for application scenarios requiring a high boost ratio.

[0095] The same or similar reference numerals correspond to the same or similar components;

[0096] The terms used in the drawings to describe positional relationships are for illustrative purposes only and are not to be construed as limiting the present application.

[0097] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A soft-switching resonant converter circuit without dead zone setting, characterized in that: It comprises: an inverter unit, a resonant unit and a rectifier unit connected in sequence; the input end of the inverter unit is connected to a power supply, and the output end of the rectifier unit is connected to a load.

2. The soft-switching resonant converter circuit without dead zone setting according to claim 1, characterized in that: The inverter unit includes: a first inductor L1, a second inductor L2, a first switch tube S1 and a second switch tube S2; One end of the first inductor L1 is connected to one end of the second inductor L2 and serves as the first input end of the inverter unit; the source of the first switching transistor S1 is connected to the source of the second switching transistor S1 and serves as the second input end of the inverter unit; the other end of the first inductor L1 is connected to the drain of the first switching transistor S1 and serves as the first output end of the inverter unit; the other end of the second inductor L2 is connected to the drain of the second switching transistor S2 and serves as the second output end of the inverter unit; the gate of the first switching transistor S1 and the gate of the second switching transistor S2 serve as input ends of a control signal, used to control the conduction and shutdown of the first switching transistor S1 and the second switching transistor S2; The first input end and the second input end of the inverter unit are respectively connected to the two ends of the power supply; the first output end and the second output end of the inverter unit are respectively connected to the resonance unit.

3. The soft-switching resonant converter circuit without dead zone setting according to claim 2, characterized in that: The first switch tube S1 and the second switch tube S2 in the inverter unit are both N-channel MOS tubes.

4. The soft-switching resonant converter circuit without dead zone setting according to claim 2, characterized in that: The first switch S1 and the second switch S2 are both turned on alternately with a duty cycle of 0.5, and no dead time is set between the control signals of the first switch S1 and the second switch S2.

5. The soft-switching resonant converter circuit without dead zone setting according to claim 2, characterized in that: The voltage across the load is adjusted by changing the switching frequency of the first switch tube S1 and the second switch tube S2.

6. The soft-switching resonant converter circuit without dead zone setting according to claim 2, characterized in that: The resonant unit includes: a capacitor Cs, a capacitor Cp and a resonant inductor Lr; The two ends of the resonant inductor Lr are respectively connected to one end of the capacitor Cs and one end of the capacitor Cp, and the other end of the capacitor Cs is connected to the other end of the capacitor Cp; the two ends of the capacitor Cs serve as the first input end and the second input end of the resonant unit respectively; the two ends of the capacitor Cp serve as the first output end and the second output end of the resonant unit respectively; The first output end and the second output end of the inversion unit are connected to the first input end and the second input end of the resonance unit respectively; the first output end and the second output end of the resonance unit are connected to the rectification unit respectively.

7. The soft-switching resonant converter circuit without dead zone setting according to claim 6, characterized in that: The rectifier unit is a full-bridge rectifier circuit, including: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a filter capacitor Co; The anode of the first diode D1 is connected to the cathode of the second diode D2 and serves as the first input terminal of the rectifier unit; the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and serves as the second input terminal of the rectifier unit; the cathode of the first diode D1 is connected to the cathode of the third diode D3 and one end of the filter capacitor Co, respectively, and serves as the first output terminal of the rectifier unit; the anode of the second diode D2 is connected to the anode of the fourth diode D4 and the other end of the filter capacitor Co, respectively, and serves as the second output terminal of the rectifier unit; The first input end and the second input end of the rectifier unit are respectively connected to the first output end and the second output end of the resonance unit; the first output end and the second output end of the rectifier unit are respectively connected to the two ends of the load.

8. The soft-switching resonant converter circuit without dead zone setting according to claim 6, characterized in that: The rectifier unit is a half-bridge rectifier circuit, including: a fifth diode D5, a sixth diode D6, a filter capacitor Co1 and a filter capacitor Co2; The anode of the fifth diode D5 and the cathode of the sixth diode D6 are connected and serve as the first input terminal of the rectifier unit, one end of the filter capacitor Co1 and one end of the filter capacitor Co2 are connected and serve as the second input terminal of the rectifier unit; the cathode of the fifth diode D5 and the other end of the filter capacitor Co1 are connected and serve as the first output terminal of the rectifier unit; the anode of the sixth diode D6 and the other end of the filter capacitor Co2 are connected and serve as the second output terminal of the rectifier unit; The first input end and the second input end of the rectifier unit are respectively connected to the first output end and the second output end of the resonance unit; the first output end and the second output end of the rectifier unit are respectively connected to the two ends of the load.

9. The soft-switching resonant converter circuit without dead zone setting according to claim 1, characterized in that: The circuit further includes a high-frequency transformer; The primary winding of the high-frequency transformer is connected to the output end of the resonant unit, and the secondary winding of the high-frequency transformer is connected to the input end of the rectifier unit.

10. A soft-switching resonant converter circuit without dead zone setting according to any one of claims 1 to 9, characterized in that: The power supply is specifically a DC voltage source.

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