JPS5813956A - Foot warmer with wooden frame - Google Patents

Abstract

PURPOSE:To enable to operate a heating body in wireless and improve the handleability thereof by a method wherein a control circuit section is provided on the main frame of the foot warmer in the wooden frame and a series resonance device, operating the control circuit section, is provided on a table board put on the main frame. CONSTITUTION:The main body 16 of the wooden frame is provided with a first oscillator 1, a detector 2 detecting the signal of an operating section, an amplifier 3, a detector 4, a comparator 5 and the second oscillator 6. The second oscillator 6 is connected to a waveform shaper 8 through an integrator 7 and the signal therefrom is fed back to the first oscillator 1 to keep the frequency of oscillation in constant while it is impressed to a temperature detector 9 and inputted into the control circuit 10 for the heating body 11. On the other hand, the table board 17 is provided with an inductance 14 and a variable capacitance 15, which are constituting the series resonance device, to enable to control said control circuit unit. Both of the main frame 16 and the table board 17 are connected in wireless through a floating capacity component between respective electrode plates 12, 13.

Description

[Detailed description of the invention] According to the present invention, a control circuit for controlling the energization of the heating element of the Yagura Kotatsu main body can be wirelessly operated by an operation unit provided on a table board used by mounting the Yagura Kotatsu main body. This is about a yagura kotatsu.

Conventional Yagura Kotatsu, for example, a Yagura Kotatsu, in which a control circuit for controlling the electricity supply to the heating element of the Yagura Kotatsu body is mounted on the table board used in the Yagura Kotatsu body, is operated by the next operation part, The control circuit provided on the table board and the control circuit that controls the power supply to the heating element of the Yagura Kotatsu body are connected by lead wires (cords), and for this purpose a kotatsu futon is attached to the Yagura Kotatsu body. The lead wires get in the way when the table board is placed and used, and the table board cannot be placed in any direction because the lead wires get in the way.

The present invention relates to a yagura kotatsu that eliminates the above-mentioned drawbacks.

An embodiment of the tower kotatsu of the present invention will be described below with reference to the drawings.

The tower kotatsu of the present invention is constructed as shown in FIG. 1, and in FIG.
The oscillator 1 is formed by a so-called voltage controlled oscillator (hereinafter abbreviated as VC0), and the external voltage, that is, as shown in FIG. It is an amplifier that amplifies the signal of 4tri
A detector 5 detects the signal from the amplifier 8, a comparator 5 compares the signal from the detector 4 with a conductivity signal, and 6Fi is a second oscillator which is Formed into a serrated wave shape. The output signal from the comparator 5 is used to maintain a constant potential by the waveform shaper 8. The output signal (DC signal) is fed back to vCOl to keep the oscillation frequency of the VCOl constant. ``Also, the above DC signal is applied as a reference signal to the temperature detector 90, and the output signal of the temperature sensor 9 is applied to the control circuit 10 to control the energization of the heating element (load) 11 of the tower kotatsu main body 16. 12A to 12B are electrode plates provided on the main body 16 of the tower kotatsu, and 13A to 18B are electrode plates provided on the table plate 17.
The electrical circuit of the table board 17 and the tower kotatsu main body 1 are caused by the capacitance components of the stray capacitance CA between A and the electrode plate 18A and the stray capacitance CB between the electrode plate 12B and the electrode plate 18B.
6 electrical circuits are connected wirelessly by capacitor coupling. An inductance I4 and a variable capacitance 15 are connected between the electrode plate 18A and the electrode plate 18B.
are connected in series.

FIG. 2 (5) is an output waveform diagram of the VCOI, FIG. 2 (B) is an output waveform diagram of the integrator 7, FIG. In the input waveform diagram, the maximum current flows in at the frequency fO during series resonance, but at other non-resonant times, the inflow current becomes extremely small compared to the resonance state.

Next, the operating state of the tower kotatsu of the present invention constructed as described above will be explained.

First, when the variable capacitance 15 of the operating section provided on the table plate 17 is varied and set to an appropriate capacitance value, the set inductance 14. Capacitance 15 (stray capacitance cA as a capacitance component.

The resonant frequency fO is determined by the value of (which is also influenced by CB). Therefore, the oscillation frequency of the VCOl is varied between the frequency fl and the frequency f2 (however, f1≦fo≦f2), but the output of the VCOI is determined by the detector 2 via the interelectrode capacitance CB f: between the electrode 12A and the electrode 18A. The detected signal is only the signal component of the resonant frequency fO, as shown in FIG. The oscillation frequency fl to f2 of the VCO 1 changes in accordance with the sweep waveform of the second oscillator 6 and the integrator 7 in FIG.
Detector 2 detects the oscillation frequency of
The wave is amplified by the detector 4, and is compared with the reference signal by the comparator 5. However, if the resonant frequency foi of the VCOI is received, the output of the comparator 5 is at a low level and the frequency at non-resonance is detected. When received, the output of the comparator 5 is set to be at a high level. When there is no resonance, the above VC is
The oscillation frequency of the OI is changing, and when resonance occurs, the output of the waveform shaper 8 is held at a certain potential with the waveform of FIG. 2(B) as shown in FIG. 2(C). Then, since the constant holding potential is applied to the VCOI, the VCOI maintains the oscillation frequency (resonant frequency fo) corresponding to the potential constant and applies it to the resonance element (inductance 14 and capacitance 15). Ru. Therefore, at the time of resonance, the impedance becomes minimum, and the detector 2 continuously detects the highest current at the time of resonance. and amplifier 8. The voltage is applied to the comparator 5 via the detector 4, and since the output of the comparator 5 is at a low level during resonance, the potential of the integrator 7 is short-circuited, and the potential at point (C) in FIG. , the oscillation frequency of vCOl deviates from the resonance frequency fo. Then, the output of the comparator 5 becomes a high level, the potential of the integrator 7 sweeps, and by repeating this resonance and non-resonance, the output of the waveform shaper 8 (0
is held constant, and the oscillation frequency of the VCO 1 is also held constant near the resonance frequency fO. As shown in FIG. 1 (since the potential at the 0 point is constant, the reference potential of the temperature detector 9 is also constant, therefore, the reference potential is used to compare the temperature of the heating element 11 with the signal of the temperature sensor (omitted). It is output as the output of the temperature detector 9 and applied to the control circuit 10 to control the temperature of the heating element II, that is, the energization.

When the variable capacitance 15 is varied, the resonant frequency of the resonator changes, and the potential at point 0 in FIG. 1 is maintained at a potential corresponding to the frequency.

This means that the output of the VCOI maintains an oscillation frequency corresponding to the potential, that is, the capacitance χ of the variable capacitance 15, and as shown in Fig.
5, that is, the resonant frequency, changes the reference potential of the temperature detector 9 (FIG. 1 (potential of Q)), thereby making it possible to change the set temperature of the heating element II.

Since the tower kotatsu of the present invention has the above configuration,
The kotatsu futon can be placed on the main body of the Yagura Kotatsu very easily, the table board can be placed in any direction, and the operation part can be operated easily and reliably using the series resonator. can.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an embodiment of the tower kotatsu of the present invention, Figures 2 (5) to (Q are output waveform diagrams of each part in Figure 1, Figure 3 is the input of the detector in Figure 1). This is a characteristic diagram. In the drawing, 10 is the control circuit, IIH load, 14 is inductance, 15 is capacitance, 16 is the main body of the Yagura Kotatsu, and 17 is the table board. Agent: Aihiko Fuku, a patent attorney.

Claims (1)

[Claims] l. A control circuit installed on the main body of the Yagura Kotatsu that controls the power supply to the load, an operating section installed on the table board used on the main body of the Yagura Kotatsu that operates the control circuit, and all the controllers. 'In a tower kotatsu that is wirelessly connected by capacitor coupling, a series resonator made of inductance and capacitance is provided in the operating section, and by varying the inductance or capacitance of the series resonator, the control circuit is controlled and applied to the load. A Yagura Kotatsu characterized by controlling the electricity supply.