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High-frequency heater

A technology of high-frequency heating device and power supply device, which is applied in microwave heating and other directions, can solve the problems of device influence, current circuit breaker shutdown, and heating of components of high-frequency heating device.

Inactive Publication Date: 2003-01-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Although the cooling capacity of the cooling fan in the high-frequency heating unit will decrease due to the voltage drop, it will still cause the components of the high-frequency heating unit to heat up because the power consumption remains the same
[0020] The increase in input current caused by the voltage drop means that the cut-off current of the circuit breaker is approached, and the worst case may cause the circuit breaker to switch off. If other devices are powered by the output connected to the same circuit breaker, these devices will be affected. influences

Method used

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Embodiment Construction

[0042] Best Mode for Carrying Out the Invention

[0043] Hereinafter, specific implementation devices of the present invention will be described with reference to the accompanying drawings.

[0044] 1 and 2 show a high-frequency heating device according to an embodiment of the invention. Figure 1, with Figure 7 Like elements in the high-frequency heating device shown (as an example of a magnetron drive circuit) are marked with the same reference numerals. 3 and 4 are schematic diagrams illustrating the input current comparison scheme, FIG. 3 is a waveform diagram related to the input current detector 16, and FIG. 4 is a waveform diagram related to the control circuit 20.

[0045] As shown in Figure 1, the high-frequency heating device of the present embodiment comprises: a power supply unit 1 connected to a civilian power supply 4, an overcurrent circuit breaker 4a is arranged at its incoming line, and the overcurrent circuit breaker is obtained from the power supply 4 Civi...

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Abstract

A high-frequency heater ensures a constant breaking current, maximizes input current, and thus produces a maximum high-frequency output efficiently. In this high-frequency heater, a power supply (1) is connected in a supply line associated with an overcurrent relay (4a), and a power converter (2) converts the power from the power supply (1) to high-frequency power and supplies it to a magnetron (15). A control circuit (20) supplies a signal to an inverter controller (10) to control input current so that the input current characteristic of the high-frequency heater may become close to the current breaking characteristic with time of the overcurrent relay (4a).

Description

technical field [0001] The present invention relates to a high-frequency heating device which uses a semiconductor power converter for generating high-frequency power as a power supply unit. Background technique [0002] The circuit diagram of the traditional high-frequency heating device is in Figure 7 with Figure 9 is shown in , while its corresponding current control mode as Figure 8 with Figure 10 shown. [0003] That said, there are generally two types of input current control modes: The first is through Figure 7 The configuration is realized, at this time the current is according to the Figure 8 The control characteristics shown in (a) and 8(b) are controlled according to the primary current (see Japanese Patent Application Publication No. Hei 11 No. 283737); the second mode is through Figure 9 The configuration is realized, at this time the current is according to the Figure 10 The control characteristics shown are controlled according to the secondary cu...

Claims

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Application Information

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IPC IPC(8): H05B6/68H05B6/66
CPCH05B6/66
Inventor 高茂丰增田慎一植田浩司
Owner SHARP KK
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