JPH0425451B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a floor heating device that is placed on the floor of a building to perform heating. Structure of a conventional example and its problems A conventional floor heating device of this kind is configured with a circuit as shown in FIG. 1 is the power switch,
2 is an AC power source, and 3 is a resistor. 4 is a temperature sensor whose impedance changes depending on the temperature of the main body A shown in FIG. 2; when the temperature of the main body A is high, the impedance is low, and when the temperature of the main body A is low, the impedance is high. 5 is a diode, 6 is an NPN transistor with a common base, and 7 is a pressurized conductive element whose conductivity increases and resistance value decreases when a physical quantity increases due to electrodes and pressure, and detects whether a human body is placed or not. It is something. 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18 are resistances, 1
9 is a variable resistor, 20 is an electrolytic capacitor, 21,2
2 is an NPN transistor with a grounded emitter, 23,
24 is a comparator, 25 is a relay, 26 is a heating element (hereinafter referred to as a heater), and 27 is applied with a DC voltage. To briefly explain the operation, when a human body is placed, the resistance value of the pressurized conductive element 7, which is the human body detection means, decreases, and the output 30 of the comparator 23 becomes Low.
Therefore, the transistor 21 is off, and the comparator 2 determines whether the heater 26 is energized or not.
31 temperature signal voltage V ₃₁ which is the input voltage of 4 and 3
It is determined by the magnitude of the temperature setting voltage V ₃₂ in step 2. _V31
If ≧V ₃₂ , the output signal 33 of 24 is High, so the transistor 22 is turned on and the heater 26 is energized. If V ₃₁ <V ₃₂ , 33 is low, so the heater 26 is not energized. When no human body is placed, the resistance value of the pressurized conductive element 7 does not change, so the output 30 of the comparator 23 is
becomes High and transistor 21 turns on, so
The transistor 22 remains OFF regardless of the input voltage of the comparator 24, and the heater 26 is not energized. Now, in a circuit like this, when a human body is not placed,
The heater 26 is always in a de-energized state, and unless a human body is placed on the body for a very short time, the main body A will get cold and the temperature will rise slowly when the human body is placed on it again, and it will take time to reach a comfortable temperature. The problem is that it takes a lot of time. Purpose of the Invention The present invention is intended to eliminate such conventional problems.When the human body is not placed on the body, the main body temperature is kept at a low temperature.When the human body is placed on the human body again, the main body temperature is quickly adjusted by the user. The temperature is changed to the desired temperature set by the heater, and a timer is started as soon as there is no human body placed on the heater.After the timer is up, the power to the heater is stopped.(If a human body is detected while the timer is running, the timer is cleared.) The purpose is to Structure of the Invention In order to achieve this object, the present invention controls the temperature of the main body according to the temperature set by the user when the body is placed on the human body, and starts a timer at the same time as detecting that the body is not placed on the human body. While the timer is operating (for a certain period of time), the temperature of the main body is controlled at a low temperature, and when the timer expires, the power to the heating element is stopped, and if a human body is detected while the timer is operating, the temperature is immediately set by the user. A new control unit is provided to control the body temperature according to the temperature. DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the circuit diagram shown in FIG. 3, the following Table 1 showing the truth table of the timer circuit shown in FIG. 3, and the time chart of the circuit diagram shown in FIG. 3. This will be explained using FIG. 4, which shows the following. In FIG. 3, the same parts as in FIG. 1 are given the same numbers. In Figure 3, 34, 35, 36 are resistances, 37, 38
is an emitter grounded NPN transistor, 39,4
0, 41, 42 are inverters, 43, 44, 45
is an AND circuit, 46 is a timer circuit, and 50 is a logic circuit. The circuit operation will be explained below. The voltage of 47 is the DC voltage of 27 V ₂₇ and the resistance 10
is divided by 11, and the voltage of 48 V ₄₈
is determined by the resistance of the pressurized conductive element 7 and the division of the resistors 8 and 9. When placed on a human body, V ₄₈ ≧ V ₄₇ and the comparator

[Table] FIG. 4 is a time chart of the output 49 signal of 23, the R terminal input signal, the output Q signal, and the S terminal input signal. State A is the state when the human body is placed, and 49 signals are present.
High, R terminal input signal Low, Q signal High, and S terminal input signal High. The body temperature is set by the user. In state B, the human body is no longer placed, and the signal 49 becomes low, so it is R.
The terminal input signal becomes High, and the S terminal input signal becomes
Since it remains High, the timer starts from Table 1 and the frequency divider starts counting. Keep the main body temperature low during the counting operation. After that, when the time-up occurs, the Q signal goes low, and the shorted S terminal input signal also goes low.
becomes Low. This state is a state in which the heater is not energized and is called the C state. After that, when the human body is placed again, the signal of 49 is High.
Therefore, the R terminal input signal becomes Low, the Q signal becomes High from Table 1 (which clears the frequency divider), and the S terminal input signal also becomes High. (Status A) After that, when no human body is placed, the signal 49 goes low.
Then, the R terminal input signal becomes High, so the timer starts and the frequency divider starts counting.
(State B) After that, when the human body placement state occurs before time-up, the signal 49 becomes High and the R terminal input signal becomes Low, so as shown in Table 1, the oscillator is stopped and the frequency divider is cleared. Q signal and S terminal input signal are
Remains High. (A state) After that, each signal is similarly generated based on the 49 output signals.
Change. Therefore, states A, B, and C can be determined from the output signal of 49 and the output Q signal of timer circuit 46. A is 49 signal High, Q signal High, B is 49
Signal Low, Q signal High, C is 49 signal Low,
The Q signal is low. Based on this, logic circuit 5
Configure 0. If the 49 signal is High and the Q signal is High (A state), only the output of the AND circuit 43 becomes High, so the transistor 37 turns on and the temperature setting voltage of 32
V ₃₂ is a voltage obtained by dividing the DC voltage V ₂₇ of 27 by resistors 15 and 16 and variable resistor 19. If the 49 signal is low and the Q signal is high (B state), only the output of the AND circuit 44 becomes high, so the transistor 38 turns on and V ₃₂ connects V ₂₇ to resistor 3.
The voltage will be divided by 4 and 35. (V ₃₂ in B state
(Determine the resistance so that it is sufficiently smaller than V ₃₂ in the A state) If the 49 signal is low and the Q signal is low (C state), only the output of the AND circuit 45 becomes High, so the transistor 21 turns on. . By the way, during the negative cycle of the AC power supply V ₂ in No. 2, the transistor 6 turns on, and the current flows from the DC power supply V ₂₁ through the parallel circuit of the resistor 14 and the capacitor 20 (the capacitor 20 is charged) to the transistor 6.
The current flows through the path of the temperature sensor 4 and the resistor 3. 2 is in a positive cycle, the charge stored in the capacitor 20 is discharged via the resistor 14. By the way, the temperature signal voltage V ₃₁ of 31 is changed by the temperature sensor 4. As the temperature of the main body increases, the impedance of the capacitor 4 decreases, the current increases, and the charge charged in the capacitor 20 increases, so the voltage of _V31 decreases. When the main body temperature decreases, the impedance of capacitor 4 increases, the current decreases, and capacitor 2
Since less charge is charged to 0, the voltage at V ₃₁ increases. Therefore, in states A and B, 31 temperature signal voltages
If the temperature setting voltage V ₃₂ is V ₃₁ ≧ 32, the signal of the output 33 of the comparator 24 becomes High, and the transistor 22 turns on, so the relay 25 turns on.
The heater 26 is energized. If V ₃₁ <V ₃₂ , the heater 26 is not energized. In state C, the transistor 21 is turned on, so the transistor 22 remains off regardless of the magnitude of the input voltage to the comparator 24, and the heater 26 is not energized. Effects of the Invention By providing a new control circuit as described above, the user can control the temperature of the main body according to his/her preference when the device is placed on a human body. When no human body is placed on the device, the main body is controlled at a low temperature, which saves energy, and the main body temperature can be set without depending on the user's settings, so there is no need for human intervention. In addition, the timer is started at the same time as the detection that no human body is placed, and when the timer expires (while the timer is running, the main unit is kept at a low temperature), the power to the heater is stopped, which prevents the user from forgetting to turn it off and also saves energy. Become. If a human body is detected while the timer is operating when no human body is placed, the timer is immediately cleared and the body temperature can be changed to the user's set temperature in a short time. This is because the main unit was left on standby at a low temperature. As described above, the user can always feel more comfortable than the main body.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a perspective view of a main body of a floor heating apparatus, FIG. 3 is a circuit diagram showing an embodiment of the present invention, and FIG. 4 is a time chart of the circuit shown in FIG. 7... Pressurized conductive element (human body detection means), 26... Heating element (heater), 46... Timer circuit.

Claims (1)

[Claims] 1. A human body detection means whose physical quantity changes when a human body is placed, a heating element, and detecting whether a human body is placed or not based on the change in the physical quantity of the human body detection means,
When placed, the first control mode controls the temperature of the heating element according to the temperature set by the user, and when not placed, a timer is started at the same time as non-placement is detected and the timer is operating (for a certain period of time). a second control mode in which the temperature of the heating element is controlled at a low temperature;
It has a third control mode that stops energizing the heating element when the timer times up when the body is not placed, and when a human body is detected during the second control mode and the third control mode. , and a control section that performs control to shift to the first control mode.