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Household cooking device

A kind of cooking equipment and equipment technology, applied in cooking utensils, household utensils, applications, etc., can solve the problems of current fuse 12 damage, surge protection device 13 failure, etc.

Active Publication Date: 2012-01-11
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional structure described above, when a voltage surge or a current surge is applied to the power input unit 11, one surge protection device 13 is temporarily short-circuited so as not to apply a surge to the load circuit 14. Therefore, when When an excessive surge voltage or surge current that cannot be fully absorbed by the surge protection device 13 is applied, the surge protection device 13 may fail in a short-circuit state
[0005] When a short-circuit fault occurs in the surge protection device 13, it will be in a short-circuit state with the power supply. Therefore, when an excessive short-circuit current flows instantaneously and exceeds the cut-off capacity of the current fuse 12, it will be disconnected with a loud noise. Cause current fuse 12 damage
[0006] In addition, there is a problem that the circuit breaker installed in the household switchboard is turned off, and the power supply to other equipment connected to the circuit breaker is stopped.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] figure 1 The circuit diagram of the surge protection function part of the household cooking appliance (especially a rice cooker) in 1st Embodiment of this invention is shown. in addition, figure 2 It is an operation diagram when a surge voltage is applied to the surge protection function part of the household cooking appliance in the first embodiment of the present invention.

[0028] Such as figure 1 As shown, a closed circuit is formed by connecting the following parts in series: the power input part 1, which is connected to the household power socket connected to the circuit breaker of the switchboard, and provides commercial power to the equipment; a current fuse 2; and a load circuit 4 for controlling the device. In addition, the first surge protection device 3 a and the second surge protection device 3 b connected in series are connected in parallel to the series circuit of the power input unit 1 and the current fuse 2 .

[0029] In addition, the surge prot...

Embodiment approach 2

[0040] image 3 It is a circuit diagram of the surge protection part of the household cooking appliance in 2nd Embodiment of this invention. In addition, the same code|symbol is attached|subjected to the same component as Embodiment 1.

[0041] Such as image 3 As shown, in this embodiment, the auxiliary current fuse 8 is connected in series with the first surge protection device 3a and the second surge protection device 3b. The current capacity of the auxiliary current fuse 8 is set to be smaller than the current capacity of the current fuse 2 .

[0042] When an excessive surge voltage is applied, one of the first surge protection device 3a and the second surge protection device 3b is short-circuited and damaged in the same manner as described in Embodiment 1, and the current follows the power input unit 1 →Current fuse 2→First surge protection device 3a→Second surge protection device 3b→Auxiliary current fuse 8→Power input unit 1 flows.

[0043] Since the current capacit...

Embodiment approach 3

[0048] Figure 4 It is a circuit diagram of the surge protection part of the household cooking appliance in 3rd Embodiment of this invention. In addition, the same code|symbol is attached|subjected to the same component as Embodiment 1.

[0049] exist Figure 4 Among them, the surge protection voltage V1 of the first surge protection device 3a and the surge protection voltage V2 of the second surge protection device 3b are set as V1

[0050] When the detected voltage is higher than the predetermined voltage, the voltage detection unit 5 sends a surge protection device failure signal 6 to notify the load circuit 4 that the surge protection device has failed, and the load circuit 4 responds to receiving the surge protection device failure signal. 6 while stopping the work of the equipment.

[0051] Normally, a voltage near the middle of the power supply voltage is a...

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Abstract

Provided is a household cooking device. A power input part (1) connected with a commercial power source, a current fuse (2) and a load circuit (4) for controlling the cooking device are connected in series to form a closed circuit. A first surge protection device (3a) and a second surge protection device (3b) in serial connection are connected in parallel with a series circuit of the power input part (1) and the current fuse (2). The surge protection voltage of the first surge protection device (3a) and the surge protection voltage of the second surge protection device (3b) are respectively below the common maximum voltage inputted from the power input part (1).

Description

technical field [0001] The invention relates to household cooking equipment used in general households, in particular to a surge protection structure for electric rice cookers against power surges. Background technique [0002] Conventionally, such a surge protection structure against power surges is constituted, for example, as described in Japanese Patent Application Laid-Open No. 2004-320851: a surge protection device called a lightning arrester or a surge absorber is inserted into the equipment In the power supply input part of the device, the voltage surge or current surge applied from the power supply part is temporarily short-circuited, so that the surge is not applied to the circuit part connected after the surge protection device. [0003] Figure 6 An existing surge protection structure is shown. Such as Figure 6 As shown, the surge protection structure is composed of the following parts: a power input part 11, a current fuse 12, a surge protection device 13 comp...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H9/04H02H3/08A47J27/00
Inventor 武智充福田浩史两角英树高椋诚一
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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