CN-121283207-B - High-voltage discharge circuit suitable for storage battery power supply and electric flame stove

Abstract

The invention discloses a high-voltage discharge circuit suitable for a storage battery power supply and an electric flame stove, comprising: the system comprises an inversion driving module, a step-up transformer T1, at least three groups of active bridge rectifier modules and a discharging module corresponding to the active bridge rectifier modules. The invention eliminates the diode and the bleeder resistor of the resonant circuit in the voltage doubling rectifying circuit in the prior art, adopts the driving of the active bridge rectifying module, dynamically adjusts PWM signals through the low ESR characteristic and the closed-loop control of the capacitor C1, avoids extra power loss, controls the working temperature of the circuit below 85 ℃ and prolongs the continuous service life of components in the circuit.

Inventors

• Request for anonymity
• Request for anonymity

Assignees

• 益能电焰科技(深圳)有限公司

Dates

Publication Date

20260508

Application Date

20251209

Claims (4)

1. 1. The high-voltage discharge circuit suitable for the storage battery power supply is used for an electric flame stove and is characterized by comprising a group of inversion driving modules, a group of step-up transformers T1, at least three groups of active bridge rectifier modules connected in parallel and at least three groups of discharge modules corresponding to the active bridge rectifier modules; The discharging module consists of a discharging electrode and a reflux electrode, the positive electrode output end of the active bridge rectifier module is electrically connected with the corresponding discharging electrode, and the negative electrode output end of the active bridge rectifier module is electrically connected with the corresponding reflux electrode; The active bridge rectifier module is a bridge driving circuit formed by a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4, wherein the switching tube Q1/Q3 and the switching tube Q2/Q4 are alternately conducted; the PWM output pins of the control chip U1 are respectively connected with the gates of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4; Two ends of a secondary coil of the step-up transformer T1 are respectively connected with two voltage sampling pins of the control chip U1 through a transformer T2 and a transformer T3; The control method of the active bridge rectifier module comprises the steps of presetting a voltage threshold, a first current threshold and a second current threshold, collecting real-time voltage signals and current signals by a control chip U1 in real time, generating target PWM signals of the control chip U1 based on an initial duty ratio, driving a switching tube Q1 and a switching tube Q2 to work in an alternating conduction mode by adopting the target PWM signals according to sampling voltages of a mutual inductor T2 and a mutual inductor T3, and driving the switching tube Q3 and the switching tube Q4 to work in the alternating conduction mode to realize AC-DC conversion, adjusting the duty ratio of the PWM signals in real time according to sampling current of a resistor R2, and adapting to high-frequency fluctuation of load impedance; The method for adjusting the duty ratio of the PWM signal in real time comprises the steps of increasing current by reducing load impedance when gas is broken down to produce plasma, reducing the duty ratio of the target PWM signal from 40% to 35%, reducing the on time, reducing output power and inhibiting current overload, and increasing the duty ratio of the target PWM signal to increase the on time, compensating current shortage, improving the output power and maintaining flame stability by increasing the load impedance when the gas flows away from the plasma.
2. 2. The high-voltage discharging circuit for the battery power supply according to claim 1, wherein the inverter driving module comprises a switching tube Q5, a switching tube Q6, a switching tube Q7 and a switching tube Q8, and bridge connection is formed among the switching tube Q5, the switching tube Q6, the switching tube Q7 and the switching tube Q8.
3. 3. The high-voltage discharge circuit for a battery power supply according to claim 2, wherein a capacitor C1 is further connected in parallel between the positive output terminal and the negative output terminal of the active bridge rectifier module.
4. 4. An electric flame stove, characterized in that it comprises a high-voltage discharge circuit according to any one of claims 1 to 3, suitable for a battery power supply.

Description

High-voltage discharge circuit suitable for storage battery power supply and electric flame stove Technical Field The invention relates to an electric flame stove. Background The electric flame stove adopts a mode of connecting a plurality of high-voltage discharge devices (positive and negative electrodes are connected in a spaced and electric discharging way) in parallel, each high-voltage discharge device utilizes high-voltage breakdown airflow to generate an electric field, and the gas flows to collide electrons in the electric field, so that gas molecules are ionized to excite plasmas, and the plasmas have high temperature of thousands of DEG C and are used for heating cookware. The electric flame stoves appearing in the market at present are also called electric fire stoves, electric flame stoves, electric combustion stoves, electric open fire stoves, plasma stoves and the like, and all adopt the working principle that high-voltage breakdown excitation plasma is used for heating cookware. With the demands of users for outdoor cooking, electric flame ranges generally require direct current power from a battery or electric vehicle, and for this purpose, development of an electric flame range with a dedicated direct current power input is required. In the prior art (as shown in fig. 1), a high-voltage alternating current output by a transformer is generally adopted, the high-voltage alternating current is rectified into a direct current with twice high voltage by a bridge type voltage-multiplying rectifying circuit parallel group, and then the voltage-multiplying direct current is respectively transmitted to a plurality of groups of corresponding high-voltage discharging devices. The output voltage of bridge voltage-multiplying rectification depends on the upper limit of capacitor charging and unidirectional conductivity of diode, and in practical circuit, even if the capacitor or diode with the same parameter type is adopted completely, the element parameters of any two parallel branches still cannot be identical, such as small capacity deviation, small leakage resistance difference and small Equivalent Series Resistance (ESR) difference between the capacitors, small forward voltage drop deviation and small reverse leakage current difference between the diodes, but the load of the electric flame stove is essentially that air is broken through by high voltage, so that air is ionized into plasma, impedance of plasma (high conductivity) is far lower than that of air (insulator), and impedance of load still fluctuates along with the flow of plasma and gas after breakdown, so that current supply capability difference of each parallel branch is amplified infinitely due to high-frequency fluctuation of load impedance. The current of each branch circuit has great difference, for example, the branch circuit with fast response (fast capacitor discharge speed and small diode impedance) can be quickly adapted to state switching, the excessive current occurs to cause excessive power, and the branch circuit with slow response (slow capacitor discharge speed and large diode impedance) occurs to cause excessive power due to small current flow, but the branch circuit can not provide enough current, and the conduction of the load can not be maintained. Meanwhile, the cathodes of all the branches are connected to a common connection point or a common ground electrode, current can flow between all the branches to form 'circulation', reactive loss is large, and part of the branches can not break through insulating gas to realize ignition or maintain high-current 'combustion', so that the stability of the electric flame stove is affected. In another application, the invention with the application number 2024105774981 provides a boost circuit for an electric stove, which comprises a first electrode P2, a second electrode P4, an input terminal P1, an input terminal P3, a first rectifying module, a second rectifying module, a first boost module and a second boost module, wherein the first rectifying module and the second rectifying module are all of a plurality of capacitors with the same specification and are connected in series, the first boost module and the second boost module are all of a plurality of boost diodes with the same specification and are connected in series, and the protection module is a resistor and a capacitor which are connected in parallel. In the invention, the diodes have tiny impedance, and a plurality of diodes are connected in parallel to amplify the impedance, meanwhile, in order to prevent the overvoltage of a circuit and ensure the stability of the circuit, the resistor discharges the excessive voltage of the circuit, so that not only is the energy loss caused, but also the oscillation caused by the divergence of current control is easy to cause. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a technical scheme capable of solving the problems. The h