Operating method of an integrated half-bridge inverter electric range that can reduce combined noise at the time of operation

Abstract

The present invention relates to a method of operating an integrated half-bridge inverter electric range capable of reducing coupling noise at the time of operation, and more specifically, to a method of operating an integrated half-bridge inverter electric range capable of reducing coupling noise at the start of operation by using a discharge circuit. The operating method of an integrated half-bridge inverter electric range according to the present invention includes a rectifier capacitor monitoring step, a discharge step, an input voltage monitoring step, and an operating step. The rectifier capacitor monitoring step measures the voltage of the rectifier capacitor using a microcontroller of the integrated half-bridge inverter electric range. The discharge step discharges the rectifier capacitor if there is a charge voltage in the rectifier capacitor during the rectifier capacitor monitoring step. The input voltage monitoring step monitors the AC voltage input to the electric range when the rectifier capacitor is discharged during the discharge step. The operating step activates the output circuit when the input voltage passes 0 volts during the input voltage monitoring step.

Description

Technology Field

[0001] The present invention relates to a method of operating an integrated half-bridge inverter electric range capable of reducing coupling noise at the time of operation, and more specifically, to a method of operating an integrated half-bridge inverter electric range capable of reducing coupling noise at the start of operation by using a discharge circuit. Background Technology

[0002] Induction electric cooktops heat cookware using electromagnetic induction. When current is sent to the working coil located beneath the cooktop, a magnetic field is generated, and as this magnetic field passes through the cookware placed on the cooktop, it creates eddy currents. These eddy currents transfer heat to the cookware itself, thereby facilitating cooking.

[0003] When operating an induction electric range, if residual power remains in the rectifier capacitor before the output starts, a large voltage difference occurs during the inverter's switching process. This leads to increased stress on the switching elements and causes unnecessary current to flow, resulting in noise. Additionally, the unbalanced voltage between the inverter and the rectifier capacitor can induce resonance. There was a problem in that the high-frequency noise generated at this time could manifest as coupled noise. Prior art literature

[0004] Registered Patent No. 10-2418392 (Registration Date: July 4, 2022) Registered Patent No. 10-2453862 (Registration Date: October 6, 2022) Registered Patent No. 10-2525461 (Registration Date: April 20, 2023) The problem to be solved

[0005] The present invention aims to solve the above-mentioned problems. The present invention aims to provide an operating method capable of minimizing coupling noise during the operation of an integrated half-bridge inverter electric range. means of solving the problem

[0006] The operating method of an integrated half-bridge inverter electric range according to the present invention includes a rectifier capacitor monitoring step, a discharge step, an input voltage monitoring step, and an operating step. The rectifier capacitor monitoring step measures the voltage of the rectifier capacitor using a microcontroller of the integrated half-bridge inverter electric range. The discharge step discharges the rectifier capacitor if there is a charge voltage in the rectifier capacitor during the rectifier capacitor monitoring step. The input voltage monitoring step monitors the AC voltage input to the electric range when the rectifier capacitor is discharged during the discharge step. The operating step activates the output circuit when the input voltage passes 0 volts during the input voltage monitoring step.

[0007] In addition, in the method of operating the above-described integrated half-bridge inverter electric range, the discharge step is preferably performed by turning on a TRIAC element connected in parallel with the rectifier capacitor to discharge. Effects of the invention

[0008] According to the present invention, when operating an electric range, the voltage charged in the rectifier capacitor is discharged first, and then the electric range is operated at zero voltage of the AC voltage. Therefore, the generation of coupled noise during the operation of the electric range can be reduced. Brief explanation of the drawing

[0009] FIG. 1 is a conceptual diagram of one embodiment of the operation method of an integrated half-bridge inverter electric range according to the present invention. Figure 2 is a conceptual diagram of a discharge circuit applied to the operating method of Figure 1. Specific details for implementing the invention

[0010] An embodiment of the operation method of an integrated half-bridge inverter electric range according to the present invention will be described with reference to FIGS. 1 and 2.

[0011] The method of operating an electric range according to the present invention includes a rectifier capacitor monitoring step (S11), a discharge step (S13), an input voltage monitoring step (S15), and an operation step (S17).

[0012] The rectifier capacitor monitoring step (S11) measures the voltage of the rectifier capacitor using a microcontroller of the integrated half-bridge inverter electric range.

[0013] If there is residual voltage in the rectifier capacitor (11), it may appear as coupling noise during operation, so it is necessary to remove the residual voltage from the rectifier capacitor (11) before operating the electric range. To do this, in the rectifier capacitor monitoring step (S11), it is determined whether there is residual voltage in the rectifier capacitor (11).

[0014] The discharge step (S13) discharges the rectifier capacitor (11) when there is a charge voltage in the rectifier capacitor (11) during the rectifier capacitor monitoring step (S11). To discharge the rectifier capacitor (11), a triac element (13) and a discharge resistor element (15) are connected in parallel with the rectifier capacitor (11). The triac element (13) is a switching element capable of allowing current to flow in both directions. When it is turned on while connected in parallel with the rectifier capacitor (11), the residual voltage of the rectifier capacitor (11) flows through the discharge resistor element (15), thereby consuming energy. Thus, when the triac element (13) is turned on, current begins to flow through the discharge resistor element (15), and the charge stored in the rectifier capacitor (11) is removed.

[0015] The input voltage monitoring step (S15) monitors the AC voltage input to the electric range after the rectifier capacitor (11) is discharged in the discharge step (S11).

[0016] When the discharge from the rectifier capacitor (11) is completed, the triac element (13) is turned off, and the microcontroller monitors the waveform of the AC input voltage supplied to the electric range in real time. Since the AC voltage fluctuates in the form of a sine wave, the microcontroller detects the Zero Voltage Cross Point where the voltage passes through 0V.

[0017] The operation step (S17) activates the output circuit when the input voltage passes 0 volts in the input voltage monitoring step (S15). Thus, the electric range is operated at the lowest output state (ZVS, Zero Voltage Start) when induction heating begins. Accordingly, noise caused by rapid voltage changes occurring during initial output can be minimized.

[0018] If the residual voltage in the rectifier capacitor (11) is not discharged when the electric range is in operation, the voltage may rise suddenly at the start of output, causing combined noise. In the case of this embodiment, noise can be reduced by suppressing such sudden voltage changes through the discharge circuit by removing the residual power.

[0019] And since it starts in the region where the AC voltage approaches 0V, the changes in current and voltage generated in the working coil proceed more smoothly. As a result, noise generated from the electromagnetic coupling between the container and the coil can be reduced. Explanation of the symbols

[0020] 11: Rectifier capacitor 13: Triac element 15 : Discharge resistor element

Claims

Claim 1 A method of operating an integrated half-bridge inverter electric range, characterized by including: a rectifier capacitor monitoring step of measuring the voltage of a rectifier capacitor when the operation of the electric range starts using a microcontroller of the integrated half-bridge inverter electric range; a discharge step of discharging the rectifier capacitor when there is a charging voltage in the rectifier capacitor during the rectifier capacitor monitoring step; an input voltage monitoring step of monitoring the AC voltage input to the electric range when the rectifier capacitor is discharged during the discharge step; and an operation step of operating an output circuit when the input voltage passes 0 volts during the input voltage monitoring step. Claim 2 A method of operating an integrated half-bridge inverter electric range according to claim 1, wherein the discharge step is characterized by turning on a TRIAC element connected in parallel with the rectifier capacitor to discharge.

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