JPH0626197U - Automotive microwave oven - Google Patents

Abstract

(57) [Summary] [Construction] Connected to an inverter circuit 4 that is connected to a DC power supply 1 to control the operation of the magnetron 7, and a voltage detection circuit 8 that detects the voltage of the DC power supply 1 applied to this inverter circuit 4. The control circuit 9 controls the operation of the inverter circuit 4 and prohibits the operation of the inverter circuit when the voltage detected by the voltage detection circuit 8 becomes equal to or lower than a specified value. A microwave oven is configured by the notifying means 10 that operates when the voltage detected by the detection circuit 8 becomes equal to or lower than a specified value. [Effect] The battery can be prevented from being over-discharged due to long-term use of the microwave oven, and cooking can be performed at any time without worrying about failure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle-mounted microwave oven mounted on an automobile.

[0002]

[Prior art]

 Recently, there has been a demand for a microwave oven that can be driven by a DC power supply provided in an automobile or the like.

FIG. 2 shows an example of a conventional microwave oven driven by a DC power supply of this type.

This microwave oven includes a microwave oven main body 21 including a control circuit 91, an inverter circuit 41, a high-voltage transformer 51, a half-wave voltage rectifier circuit 61, a magnetron 71, and the like, and a power source connected to the inverter circuit 41. A cord 21 is provided, and this power cord 21 is connected to the DC power source 11 (hereinafter, battery) of the automobile.

In the above configuration, the battery 11 supplies DC power to the inverter circuit 41 via the power cord 21.

The aforementioned inverter circuit 41 converts this DC power into high frequency AC power and supplies it to the primary winding of the high voltage transformer 51.

Therefore, a boosted voltage is generated in the secondary winding of the high-voltage transformer 51, a DC voltage is applied to the magnetron 71 via the half-wave voltage doubler circuit 61, and the magnetron 71 oscillates to generate microwaves. It is generated and heats the object to be heated. (See JP-A-4-56089 JP conventional example)

[0008]

[Problems to be solved by the device]

 By the way, it is thought that simple cooking (for example, warming of drinks and bento boxes) is the main conceivable application of microwave ovens in automobiles, but at least 200 to 300 W is required for heating. It seems that high frequency output is required.

Therefore, since the input power to the microwave oven is 400 to 600 W, the output current of the DC power supply needs to be 35 to 50 A.

However, since the electric capacity of a battery mounted in a normal automobile is about several tens of AH, there is a possibility that the battery may be discharged and partitioned when used for a long time.

[0011]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, when the voltage detected by the voltage detection circuit that detects the voltage supplied from the battery to the inverter circuit falls below the specified value, if the microwave oven is operating by the control circuit. It stops the operation, prohibits the operation when the electronic range is not in operation, and notifies the battery voltage drop by the notification means connected to the control circuit.

[0012]

[Action]

 Preventing the battery from over-discharging by preventing the microwave oven from operating when it detects that the voltage of the battery has dropped and by notifying that the battery voltage has dropped by the notification means. .

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 1 is an automobile battery, which is connected to a main body 3 of a microwave oven by a power cord 2.

Reference numeral 4 is an inverter circuit connected to the battery 1 described above, the output of which is applied to the primary winding of the high voltage transformer 5.

Reference numeral 6 is a half-wave voltage doubler rectifier circuit connected to the secondary winding of the high-voltage transformer 5, and a magnetron 7 is connected to this circuit 6.

Reference numeral 8 is a voltage detection circuit for detecting the DC voltage applied from the battery 1 to the inverter circuit 4 described above.

Reference numeral 9 is a control circuit for inputting the detection signal D of the DC voltage value detected by the voltage detection circuit 8 and controlling the operation of the inverter circuit 4 according to the detection signal D detected. Is.

Reference numeral 10 is a notification means such as a buzzer, which generates a notification sound according to the detection signal D from the control circuit 9 described above.

The main body 3 of the microwave oven is constituted by the inverter circuit 4, the high-voltage transformer 5, the half-wave voltage doubler rectifier circuit 6, the magnetron 7, the voltage detection circuit 8, the control circuit 9 and the notification means 10.

Next, the operation of this embodiment will be described.

First, in the use of a microwave oven, the object to be heated is housed in the heating chamber (not shown) of the main body 3 and the main body 3 is connected to the battery 1 via the power cord 2. .

Therefore, DC power is supplied from the battery 1 to the inverter circuit 4.

Therefore, the inverter circuit 4 converts this DC power into high-frequency AC power and supplies it to the primary winding of the high-voltage transformer 5.

As a result, a boosted voltage is generated in the secondary winding of the high-voltage transformer 5, and a DC voltage is applied to the magnetron 7 via the half-wave voltage doubler circuit 6 connected to this secondary winding. It

The magnetron 7 to which the DC voltage is applied starts oscillation and generates microwaves, and the microwave heats the object to be heated.

During the oscillation of the magnetron 7, the voltage of the battery 1 input via the power cord 2 is monitored by the voltage detection circuit 8.

When the microwave oven is used for a long time in such a state, the electric capacity of the battery 1 gradually decreases.

When the electric capacity of the battery 1 is extremely reduced, the voltage value of the battery 1 input to the microwave oven gradually decreases.

At this time, the voltage detection circuit 8 detects the falling voltage, and when it becomes equal to or lower than a specified voltage value, it transmits it as a detection signal D to the control circuit 9.

After receiving the detection signal D, the control circuit 9 immediately stops the operation of the inverter circuit 4 if the inverter circuit 4 is operating, and if the inverter circuit 4 is not operating, the user tries to operate the microwave oven. Even if it is operated, this is invalidated, and at the time when the voltage detection circuit 8 detects the voltage drop, the notification means 10 notifies the user of the low capacity of the battery 1.

Further, the user can be notified by replacing the notification means 10 with a light emitting element such as an LED and providing the light emitting element on a panel portion (not shown) of a microwave oven and turning on the light.

[0033]

[Effect of device]

 As described above, according to the present invention, the microwave oven is disabled when it is detected that the battery voltage has dropped due to long-term use of the microwave oven, and the battery voltage has dropped by the notification means. Since it is notified to the user, it is possible to prevent the battery from over-discharging in advance, and it is possible to provide an in-vehicle microwave oven that can perform simple cooking anytime with confidence and without failure. .

[Brief description of drawings]

FIG. 1 is a circuit diagram of a vehicle-mounted microwave oven according to an embodiment of the present invention.

FIG. 2 is an example of a circuit diagram of a conventional vehicle-mounted microwave oven.

[Explanation of symbols]

 1 DC power supply 4 Inverter circuit 7 Magnetron 8 Voltage detection circuit 9 Control circuit 10 Notification means

Claims (2)

[Scope of utility model registration request] 1. A DC power supply (1) and an inverter circuit connected to the DC power supply for controlling the operation of a magnetron (7).
(4), a voltage detection circuit (8) for detecting the voltage of the DC power supply applied to the inverter circuit, and a voltage detection circuit connected to the voltage detection circuit to control the operation of the inverter circuit and A vehicle-mounted microwave oven, comprising: a control circuit (9) for inhibiting the operation of the inverter circuit when the detected voltage becomes equal to or lower than a specified value. 2. The informing means (10), which is connected to the control circuit and operates when the voltage detected by the voltage detecting means becomes less than a specified value. Automotive microwave oven.