The boost discharge circuit of an outdoor electric flame stove
By employing a boost discharge circuit with complementary drive signals and dead time control in the electric flame stove, combined with hardware interlocking and an LC resonant network, the problem of voltage instability in outdoor environments has been solved, achieving efficient and stable high-voltage output and improved safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- YINENG ELECTRIC FLAME TECH (SHENZHEN) CO LTD
- Filing Date
- 2026-06-09
- Publication Date
- 2026-07-10
AI Technical Summary
Existing electric flame stoves are prone to voltage instability in outdoor environments due to electromagnetic interference, voltage fluctuations, and slight frequency fluctuations. This can easily lead to oscillations, drift, and even damage to MOSFETs, posing significant safety hazards and making them unable to adapt to load fluctuations.
The boost discharge circuit employs complementary drive signals and dead-time control. It prevents the upper and lower transistors of the bridge arm from conducting simultaneously through a hardware interlock circuit and discharges leakage energy during the dead time. Combined with an LC resonant network, it achieves soft switching, ensuring stable voltage and efficient output.
It achieves a monotonically decreasing voltage gain in the high-frequency band, stable high-voltage output, reduced switching losses, improved safety and stability of the electric flame stove, and adaptability to high-power load fluctuations.
Smart Images
Figure CN122371658A_ABST
Abstract
Description
Technical Field
[0001] This invention specifically relates to an electric flame stove. Background Technology
[0002] Electric flame stoves employ multiple high-voltage discharge devices (connected in parallel with positive and negative electrodes in a closed-circuit discharge configuration). Each device generates an electric field by blasting gas flow through high voltage. The gas flow collides with electrons in this electric field, ionizing the gas molecules and exciting plasma. This plasma, with a temperature exceeding 1000 degrees Celsius, is used to heat cookware. Currently, electric flame stoves on the market are also known as electric fire stoves, electric fire starter stoves, electric flame stoves, electric gas stoves, electric open flame stoves, plasma stoves, etc. All of these stoves utilize the working principle of high-voltage breakdown to excite plasma for heating cookware.
[0003] Electric flame stoves do not require gas and have the advantages of being environmentally friendly and convenient, so they are widely used in mobile catering for outdoor camping, field work, and other purposes.
[0004] Electric flame stoves generate plasma by high-voltage breakdown of air, achieving flameless heating with advantages such as safety, environmental friendliness, and high efficiency. Outdoor applications typically use 48V batteries for power, requiring a boost circuit to raise the 48V DC voltage to several thousand volts to maintain stable plasma discharge.
[0005] Existing related technologies mostly adopt an architecture of inverter → step-up transformer → active rectification. To achieve soft switching and zero-voltage turn-on, an LC resonant network is often configured on the output side. Although this can broaden the soft-switching operating range to some extent, it still has many drawbacks: Existing technologies rely solely on software timing control to turn on the switching transistors. However, outdoor environments present challenges such as strong electromagnetic interference, voltage fluctuations, and clock jitter, which can easily lead to the simultaneous conduction of transistors on the same bridge arm.
[0006] Existing technologies use LC resonance to ensure voltage stability, but the voltage gain of its circuit exhibits severe nonlinearity and non-monotonicity as it changes with frequency, resulting in multiple gain peaks and valleys within the operating frequency band. Even small frequency fluctuations can cause drastic jumps in output voltage, leading to high voltage runaway, arc instability, and frequent arcing failures. This makes it impossible for conventional PWM closed-loop control to stably lock the operating point, making it prone to oscillations, drift, and even entering the unstable region, which can damage the MOSFET.
[0007] The short-circuit current of a 48V battery is extremely high. Once a short circuit occurs, it can instantly burn out the switching transistor, transformer, or even the battery, posing a huge safety hazard and having extremely poor fault tolerance.
[0008] The existing technology lacks control logic, and there is no safety interval when the bridge arm switch is switched, which can easily lead to overlapping conduction of the upper and lower tubes. During the switching of the secondary switch, the leakage inductance energy cannot be effectively discharged, resulting in extremely high voltage spikes that can break down high-voltage devices. At the same time, the leakage inductance energy is dissipated as heat, leading to increased circuit temperature, high losses, and unstable arcing, making it unsuitable for outdoor load fluctuation conditions. Summary of the Invention
[0009] To overcome the shortcomings mentioned above, the present invention aims to provide a technical solution that can solve the above problems.
[0010] A boost discharge circuit for an outdoor electric flame stove, used in an outdoor electric flame stove, includes: a control circuit, a storage battery, a primary side first bridge arm, a primary side second bridge arm, a boost transformer, a secondary side third bridge arm, a secondary side fourth bridge arm, and a high voltage output terminal. The primary side first bridge arm is composed of a first MOSFET M1 and a second MOSFET M2 connected in series, and the primary side second bridge arm is composed of a fifth MOSFET M5 and a sixth MOSFET M6 connected in series. After the primary side first bridge arm and the primary side second bridge arm are connected in parallel, the connection points at both ends of the two bridge arms are respectively connected to the two ends of the battery. The midpoint of the primary side first bridge arm and the midpoint of the primary side second bridge arm are respectively connected to the two ends of the main winding of the step-up transformer. The third bridge arm of the secondary side is composed of the third MOSFET M3 and the fourth MOSFET M4 connected in series, and the fourth bridge arm of the secondary side is composed of the seventh MOSFET M7 and the eighth MOSFET M8 connected in series. After the third bridge arm and the fourth bridge arm of the secondary side are connected in parallel, the connection points at both ends of the two sides are respectively connected to the two-way electrodes of the high voltage output terminal. The midpoint of the third bridge arm and the midpoint of the fourth bridge arm of the secondary side are respectively connected to the two ends of the secondary winding of the step-up transformer. The control circuit is connected to the gates of the first MOS transistor M1, the second MOS transistor M2, the fifth MOS transistor M5, the sixth MOS transistor M6, the third MOS transistor M3, the fourth MOS transistor M4, the seventh MOS transistor M7, and the eighth MOS transistor M8, respectively. The control circuit outputs complementary drive signals to the primary side first bridge arm, the primary side second bridge arm, the secondary side third bridge arm, and the secondary side fourth bridge arm, and inserts dead time; Preferably, the control circuit integrates four independent hardware interlock circuits, and the four hardware interlock circuits correspond one-to-one with the first primary side bridge arm, the second primary side bridge arm, the third secondary side bridge arm, and the fourth secondary side bridge arm. Preferably, the boost discharge circuit of the outdoor electric flame stove further includes a set of LC resonant networks; the LC resonant network is composed of a resonant inductor L1 and a resonant capacitor C1, which are connected in series or in parallel between the secondary side of the boost transformer and the third bridge arm of the secondary side. Preferably, the control method of the boost discharge circuit is applied to the boost discharge circuit. The control circuit uses its built-in four independent hardware interlock circuits to interlock and protect the first primary side bridge arm, the second primary side bridge arm, the third secondary side bridge arm, and the fourth secondary side bridge arm respectively, prohibiting the upper and lower switching transistors of the same bridge arm from being turned on at the same time. Preferably, the four independent hardware interlock circuits include a first interlock circuit, a second interlock circuit, a third interlock circuit, and a fourth interlock circuit; the first interlock circuit is used to prevent the first MOSFET M1 and the second MOSFET M2 from conducting simultaneously; the second interlock circuit is used to prevent the fifth MOSFET M5 and the sixth MOSFET M6 from conducting simultaneously; the third interlock circuit is used to prevent the third MOSFET M3 and the fourth MOSFET M4 from conducting simultaneously; and the fourth interlock circuit is used to prevent the seventh MOSFET M7 and the eighth MOSFET M8 from conducting simultaneously. Preferably, the complementary drive signal operates as follows: when the first MOSFET M1 is turned on, the second MOSFET M2 is turned off; when the second MOSFET M2 is turned on, the first MOSFET M1 is turned off; when the fifth MOSFET M5 is turned on, the sixth MOSFET M6 is turned off; when the sixth MOSFET M6 is turned on, the fifth MOSFET M5 is turned off; when the third MOSFET M3 is turned on, the fourth MOSFET M4 is turned off; when the fourth MOSFET M4 is turned on, the third MOSFET M3 is turned off; when the seventh MOSFET M7 is turned on, the eighth MOSFET M8 is turned off; when the eighth MOSFET M8 is turned on, the seventh MOSFET M7 is turned off. Preferably, within the dead time window between the seventh MOS transistor M7 and the eighth MOS transistor M8 of the fourth bridge arm on the secondary side, the control circuit performs the following operations: keeping the third MOS transistor M3 of the third bridge arm on the secondary side and the eighth MOS transistor M8 of the fourth bridge arm on the secondary side in the off state, while controlling the second MOS transistor M2 of the first bridge arm on the primary side and the fifth MOS transistor M5 of the second bridge arm on the primary side to be turned on. Preferably, within the dead time window between the third MOS transistor M3 and the fourth MOS transistor M4 of the third bridge arm on the secondary side, the control circuit performs the following operations: keeping the seventh MOS transistor M7 of the fourth bridge arm on the secondary side and the fourth MOS transistor M4 of the third bridge arm on the secondary side in the off state, while controlling the sixth MOS transistor M6 of the second bridge arm on the primary side and the first MOS transistor M1 of the first bridge arm on the primary side to be turned on. Preferably, when an overvoltage or overcurrent fault occurs at the high-voltage output terminal, the control circuit immediately cuts off the drive signals of all bridge arm switching transistors, causing all switching transistors to turn off.
[0011] Compared with the prior art, the advantages of the present invention are: The interlocking protection and dead time insertion of each bridge arm form a coordinated control. The insertion of dead time ensures a safe interval when the primary and secondary sides switch. During the dead time, the leakage inductance energy can be safely discharged through resonance and coordinated control, reducing peak voltage and device stress. The complementary drive enables the MOSFET to operate in the soft switching / low loss range, reducing switching losses, reducing heat generation, and improving efficiency, making it suitable for long-term operation of high-power boost discharge circuits.
[0012] This invention performs forced locking of the diagonal switch of the secondary bridge arm to turn off and the other diagonal switch to turn on during the dead time, further enabling the voltage gain of the boost circuit to decrease monotonically with increasing frequency in the high frequency range of 20kHz to 200kHz, achieving a smooth gain curve without abrupt changes, stable high voltage output, and continuous and reliable arcing.
[0013] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a circuit diagram of the present invention. Detailed Implementation
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0018] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0019] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0020] Please see Figure 1 In this embodiment of the invention, a boost discharge circuit for an outdoor electric flame stove that is adapted to 48V outdoor battery power supply, has high power, high reliability, low loss, and a wide soft switching range, has the following overall structure: Figure 1 As shown, it mainly includes: control circuit 100, 48V battery 200, primary side first bridge arm 300, primary side second bridge arm 400, step-up transformer T1, LC resonant network 500, secondary side third bridge arm 600, secondary side fourth bridge arm 700, and high voltage output terminal 800.
[0021] The overall working logic of the circuit is as follows: The 48V battery 200 is inverted by the primary side double bridge arm and outputs high-frequency AC to the step-up transformer T1; a set of LC resonant network 500 is connected in series / parallel on the secondary side of the step-up transformer T1 and then connected to the secondary side double bridge arm; the secondary side double bridge arm outputs high-frequency high-voltage pulses to the two electrodes of the high-voltage output terminal 800, which breaks down the air to generate plasma flame; the control circuit 100 outputs a complementary drive signal with dead time and integrates four independent hardware interlocks to realize bridge arm shoot-through protection, dead time energy discharge, monotonic voltage gain, wide zero voltage turn-on, and fast fault shutdown.
[0022] The primary side first bridge arm 300 is composed of the first MOSFET M1 and the second MOSFET M2 connected in series, and the primary side second bridge arm 400 is composed of the fifth MOSFET M5 and the sixth MOSFET M6 connected in series. After the primary side first bridge arm 300 and the primary side second bridge arm 400 are connected in parallel, the connection points at both ends of the two are respectively connected to the two ends of the battery. The midpoint of the primary side first bridge arm 300 and the midpoint of the primary side second bridge arm 400 are respectively connected to the two ends of the main winding of the step-up transformer T1.
[0023] The third bridge arm 600 on the secondary side is composed of the third MOSFET M3 and the fourth MOSFET M4 connected in series, and the fourth bridge arm 700 on the secondary side is composed of the seventh MOSFET M7 and the eighth MOSFET M8 connected in series. After the third bridge arm 600 and the fourth bridge arm 700 on the secondary side are connected in parallel, the connection points at both ends of the two sides are respectively connected to the two-way electrodes of the high voltage output terminal 800. The midpoint of the third bridge arm 600 and the midpoint of the fourth bridge arm 700 on the secondary side are respectively connected to the two ends of the secondary winding of the step-up transformer T1.
[0024] The control circuit 100 is connected to the gates of the first MOSFET M1, the second MOSFET M2, the fifth MOSFET M5, the sixth MOSFET M6, the third MOSFET M3, the fourth MOSFET M4, the seventh MOSFET M7, and the eighth MOSFET M8, respectively.
[0025] In this embodiment of the invention, the control circuit 100 outputs complementary drive signals to the primary side first bridge arm 300, the primary side second bridge arm 400, the secondary side third bridge arm 600, and the secondary side fourth bridge arm 700 respectively, ensuring in terms of timing that no upper and lower switching transistors of the same bridge arm are simultaneously turned on, thereby preventing high-current short circuits.
[0026] Simultaneously, the control circuit 100 inserts fixed dead times into the primary side first bridge arm 300, the primary side second bridge arm 400, the secondary side third bridge arm 600, and the secondary side fourth bridge arm 700, respectively. During these dead times, the upper and lower switches on the same bridge arm are simultaneously turned off. The insertion of dead times ensures a safe interval between the switching times of the primary and secondary sides. The leakage inductance energy during the dead time can be safely discharged through resonance and coordinated control, reducing peak voltage and device stress. Complementary driving enables the MOSFETs to operate in the soft-switching / low-loss range, reducing switching losses, reducing heat generation, and improving efficiency, making it suitable for long-term operation of high-power boost discharge circuits.
[0027] The aforementioned complementary drive hardware consists of a control circuit 100 integrating four independent hardware interlock circuits, each corresponding to one of the primary side's first bridge arm 300, the primary side's second bridge arm 400, the secondary side's third bridge arm 600, and the secondary side's fourth bridge arm 700. The four independent hardware interlock circuits include a first interlock circuit, a second interlock circuit, a third interlock circuit, and a fourth interlock circuit. The first interlock circuit prevents the first MOSFET M1 and the second MOSFET M2 from conducting simultaneously; the second interlock circuit prevents the fifth MOSFET M5 and the sixth MOSFET M6 from conducting simultaneously; the third interlock circuit prevents the third MOSFET M3 and the fourth MOSFET M4 from conducting simultaneously; and the fourth interlock circuit prevents the seventh MOSFET M7 and the eighth MOSFET M8 from conducting simultaneously.
[0028] Complementary drive and dead time insertion provide the basic timing for hardware interlocking. The three form a multi-layered safety protection system, which works synergistically from three levels: timing constraints, logic interlocking, and hardware forced blocking. This completely avoids the short-circuit risk of simultaneous conduction of the upper and lower transistors of the bridge arm. It not only reduces switching losses, heat generation, and improves efficiency, but also achieves monotonically decreasing gain, smooth curve, and more reliable protection without random peaks.
[0029] In this embodiment of the invention, the boost discharge circuit of the outdoor electric flame stove further includes an LC resonant network 500. The LC resonant network 500 is composed of a resonant inductor L1 and a resonant capacitor C1, which are connected in series or in parallel between the secondary side of the boost transformer T1 and the third bridge arm 600 of the secondary side. The secondary side of the boost transformer T1 outputs high-frequency high-voltage AC power, which flows through the resonant network composed of the resonant inductor L1 and the resonant capacitor C1. Near the operating frequency (20kHz to 200kHz), the resonant inductor L1 and the resonant capacitor C1 resonate, and soft switching is achieved by utilizing the synergistic effect of the transformer leakage inductance and LC resonance.
[0030] In this embodiment of the invention, the control method for the boost discharge circuit is applied to the boost discharge circuit. The control circuit 100 uses its built-in four independent hardware interlock circuits to interlock and protect the primary side first bridge arm 300, primary side second bridge arm 400, secondary side third bridge arm 600, and secondary side fourth bridge arm 700, respectively, prohibiting the upper and lower switching transistors of the same bridge arm from conducting simultaneously. The hardware interlock is independent of the software and forcibly locks at the hardware level, avoiding serious accidents such as instantaneous high current, component burnout, transformer damage, and battery short circuit caused by shoot-through of the upper and lower transistors under the 48V battery 200 operating condition, significantly improving safety. The hardware interlock works in conjunction with complementary drive and dead time control to provide double protection, eliminating shoot-through from both timing and hardware aspects, greatly reducing the probability of failure and improving the overall stability of the machine.
[0031] The complementary drive signal operates as follows: when the first MOSFET M1 is turned on, the second MOSFET M2 is turned off; when the second MOSFET M2 is turned on, the first MOSFET M1 is turned off; when the fifth MOSFET M5 is turned on, the sixth MOSFET M6 is turned off; when the sixth MOSFET M6 is turned on, the fifth MOSFET M5 is turned off; when the third MOSFET M3 is turned on, the fourth MOSFET M4 is turned off; when the fourth MOSFET M4 is turned on, the third MOSFET M3 is turned off; when the seventh MOSFET M7 is turned on, the eighth MOSFET M8 is turned off; when the eighth MOSFET M8 is turned on, the seventh MOSFET M7 is turned off.
[0032] During the dead time window between the seventh MOSFET M7 and the eighth MOSFET M8 of the fourth bridge arm 700 on the secondary side, the control circuit 100 turns off the fifth MOSFET M5 of the third bridge arm 600 on the secondary side and the eighth MOSFET M8 of the second bridge arm 400 on the primary side, and turns on the second MOSFET M2 of the first bridge arm 300 on the primary side and the third MOSFET M3 of the second bridge arm 400 on the primary side.
[0033] In one embodiment of the present invention, within the dead time window between the seventh MOSFET M7 and the eighth MOSFET M8 of the fourth bridge arm 700 on the secondary side, the control circuit 100 performs the following operations: forcibly locking the third MOSFET M3 of the third bridge arm 600 and the eighth MOSFET M8 of the fourth bridge arm 700 on the secondary side to the off state, avoiding electromagnetic interference and timing errors that could cause the secondary side switching transistors to be falsely triggered, preventing the secondary bridge arm from being shot-through, and eliminating the risk of short circuit on the secondary side; simultaneously turning on the second MOSFET M2 of the first bridge arm 300 and the fifth MOSFET M5 of the second bridge arm 400 on the primary side, providing a stable and controllable primary side discharge path for the leakage inductance energy of the transformer, further enabling the voltage gain of the boost circuit to decrease monotonically with increasing frequency in the high frequency range of 20kHz to 200kHz, with a smooth gain curve and no abrupt changes, stable high voltage output, and reliable arcing, avoiding the accumulation of leakage inductance energy to generate high voltage spikes, protecting the high voltage MOSFETs and transformer, and reducing device stress.
[0034] In one embodiment of the present invention, within the dead time window between the third MOSFET M3 and the fourth MOSFET M4 of the third bridge arm 600 on the secondary side, the control circuit 100 performs the following operations: keeping the seventh MOSFET M7 of the fourth bridge arm 700 and the fourth MOSFET M4 of the third bridge arm 600 on the secondary side in the off state, while simultaneously controlling the sixth MOSFET M6 of the second bridge arm 400 and the first MOSFET M1 of the first bridge arm 300 on the primary side to be turned on. The principle is the same as in the previous embodiment and will not be repeated here.
[0035] In another embodiment, when an overvoltage or overcurrent fault occurs at the high voltage output terminal 800, the control circuit 100 immediately cuts off the drive signals of all bridge arm switching transistors, causing all switching transistors to turn off.
[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.
Claims
1. A boost discharge circuit for an outdoor electric flame stove, used in an outdoor electric flame stove, characterized in that, include: Control circuit, battery, primary side first bridge arm, primary side second bridge arm, step-up transformer, secondary side third bridge arm, secondary side fourth bridge arm, high voltage output terminal; The primary side first bridge arm is composed of a first MOSFET M1 and a second MOSFET M2 connected in series, and the primary side second bridge arm is composed of a fifth MOSFET M5 and a sixth MOSFET M6 connected in series. After the primary side first bridge arm and the primary side second bridge arm are connected in parallel, the connection points at both ends of the two bridge arms are respectively connected to the two ends of the battery. The midpoint of the primary side first bridge arm and the midpoint of the primary side second bridge arm are respectively connected to the two ends of the main winding of the step-up transformer. The third bridge arm of the secondary side is composed of the third MOSFET M3 and the fourth MOSFET M4 connected in series, and the fourth bridge arm of the secondary side is composed of the seventh MOSFET M7 and the eighth MOSFET M8 connected in series. After the third bridge arm and the fourth bridge arm of the secondary side are connected in parallel, the connection points at both ends of the two sides are respectively connected to the two-way electrodes of the high voltage output terminal. The midpoint of the third bridge arm and the midpoint of the fourth bridge arm of the secondary side are respectively connected to the two ends of the secondary winding of the step-up transformer. The control circuit is connected to the gates of the first MOS transistor M1, the second MOS transistor M2, the fifth MOS transistor M5, the sixth MOS transistor M6, the third MOS transistor M3, the fourth MOS transistor M4, the seventh MOS transistor M7, and the eighth MOS transistor M8, respectively. The control circuit outputs complementary drive signals to the primary side first bridge arm, the primary side second bridge arm, the secondary side third bridge arm, and the secondary side fourth bridge arm, and inserts dead time.
2. The boost discharge circuit of the outdoor electric flame stove according to claim 1, characterized in that, The control circuit integrates four independent hardware interlocking circuits, each corresponding to the first primary bridge arm, the second primary bridge arm, the third secondary bridge arm, and the fourth secondary bridge arm.
3. The boost discharge circuit of the outdoor electric flame stove according to claim 1, characterized in that, It also includes a set of LC resonant networks; the LC resonant network consists of a resonant inductor L1 and a resonant capacitor C1, which are connected in series or in parallel between the secondary side of the step-up transformer and the third bridge arm of the secondary side.
4. The boost discharge circuit of the outdoor electric flame stove according to claim 3, characterized in that, Applied to the aforementioned boost discharge circuit, the control circuit uses its built-in four independent hardware interlock circuits to interlock and protect the first primary bridge arm, the second primary bridge arm, the third secondary bridge arm, and the fourth secondary bridge arm, respectively, prohibiting the upper and lower switching transistors of the same bridge arm from being turned on simultaneously.
5. The boost discharge circuit of the outdoor electric flame stove according to claim 4, wherein the four independent hardware interlock circuits include a first interlock circuit, a second interlock circuit, a third interlock circuit, and a fourth interlock circuit; characterized in that, The control method for the boost discharge circuit is as follows: The first interlock circuit is used to prevent the first MOSFET M1 and the second MOSFET M2 from being turned on simultaneously; the second interlock circuit is used to prevent the fifth MOSFET M5 and the sixth MOSFET M6 from being turned on simultaneously; the third interlock circuit is used to prevent the third MOSFET M3 and the fourth MOSFET M4 from being turned on simultaneously; and the fourth interlock circuit is used to prevent the seventh MOSFET M7 and the eighth MOSFET M8 from being turned on simultaneously.
6. The boost discharge circuit of the outdoor electric flame stove according to claim 4, characterized in that, The complementary drive signal operates as follows: when the first MOSFET M1 is turned on, the second MOSFET M2 is turned off; when the second MOSFET M2 is turned on, the first MOSFET M1 is turned off; when the fifth MOSFET M5 is turned on, the sixth MOSFET M6 is turned off; when the sixth MOSFET M6 is turned on, the fifth MOSFET M5 is turned off; when the third MOSFET M3 is turned on, the fourth MOSFET M4 is turned off; when the fourth MOSFET M4 is turned on, the third MOSFET M3 is turned off; when the seventh MOSFET M7 is turned on, the eighth MOSFET M8 is turned off; when the eighth MOSFET M8 is turned on, the seventh MOSFET M7 is turned off.
7. The boost discharge circuit of the outdoor electric flame stove according to claim 4, characterized in that, During the dead-time window between the seventh MOSFET M7 and the eighth MOSFET M8 in the fourth bridge arm of the secondary side, the control circuit performs the following operations: Keep the third MOSFET M3 of the third bridge arm on the secondary side and the eighth MOSFET M8 of the fourth bridge arm on the secondary side in the off state, while controlling the second MOSFET M2 of the first bridge arm on the primary side and the fifth MOSFET M5 of the second bridge arm on the primary side to be turned on.
8. The boost discharge circuit of the outdoor electric flame stove according to claim 4, characterized in that, During the dead-time window between the third MOSFET M3 and the fourth MOSFET M4 in the third bridge arm of the secondary side, the control circuit performs the following operations: Keep the seventh MOSFET M7 of the fourth bridge arm on the secondary side and the fourth MOSFET M4 of the third bridge arm on the secondary side in the off state, while controlling the sixth MOSFET M6 of the second bridge arm on the primary side and the first MOSFET M1 of the first bridge arm on the primary side to be turned on.
9. The boost discharge circuit of the outdoor electric flame stove according to claim 4, characterized in that, When an overvoltage or overcurrent fault occurs at the high-voltage output terminal, the control circuit immediately cuts off the drive signals of all bridge arm switching transistors, causing all switching transistors to turn off.