JPS62290085A - Floor warming apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a floor heating device that is placed on the floor of a building to provide heating.

BACKGROUND OF THE INVENTION Recently, there has been a demand for floor heating systems to have multiple functions, and to meet this demand, microcomputers (hereinafter referred to as microcomputers) have begun to be installed. FIG. 6 shows a general circuit block diagram of a floor heating system that is equipped with a microcomputer, divides the main body of the floor heating system into two parts, and controls each part independently.

Since a detailed explanation of the circuit will be given using FIG. 7, the operation will be briefly described here. First, to control the temperature of the first part of the main body, the signal from the first temperature setting part 9 of the main body is taken in from the input port PI3, the signal from the first temperature detection part 13 is taken in from R11, and the signal is taken in, compared, and set. If the temperature is higher than the detected temperature, a Hi multiple signal is output to the first energization control section 61 to energize the first heating element. If the set temperature is lower than the detected temperature and goes to 3, a Lo output is output and no current is applied. The temperature control of the second part of the body is also similar to the temperature control of the first part.

The temperature over-rise detection voltage setting section 57 sets a voltage for detecting an abnormal temperature rise of the main body, and is configured to set a voltage for detecting an abnormal temperature rise of the main body, and output voltages from the first temperature detection section 13 and the second temperature detection section 14 respectively. If an abnormal temperature rise of the main body is detected, the first thyristor 43 and the second thyristor 63 are turned on, respectively, and the temperature fuse 2 is blown. Also P. 8 outputs a LO output when no signal is output to the first energization control section 61 (Lo output), outputs a gate trigger signal to the first thyristor, and if the first energization control section 61 has a short-circuit failure. If so, blow out temperature fuse 2. Similarly, Po9 outputs LO when no signal is output to the second energization control section 62, and the second thyristor melts down the temperature heater 2 in the event of a short-circuit failure in the second energization control section 62. As mentioned above, the detection of abnormal temperature rise of the main body and the detection of short-circuit failure in the energization control section are the main functions of the main body.

The second part is done separately.

Next, the operation will be described in detail using FIG. 7, which replaces the block diagram of FIG. 6 described above with an actual circuit.

1 is an AC power supply voltage, 2 is a temperature fuse, and 3 is a power supply circuit that has a DC power supply voltage v1. Make v2. 4 is a microcomputer, 6 is a reset circuit for the microcomputer 4, 6 is a clock generation circuit, 7 is an AC synchronization signal generation circuit, 8 is a display section, 9 is a temperature setting section of the first part of the main body, 10 is a temperature setting section of the second part 11 is a switch section, 12 is a D/A conversion section, 13 is a first part temperature detection part of the main body, 14 is a second part temperature detection part of the main body, 16
．． 16 is a resistor, 17 is a comparator for detecting the temperature of the first part, 18 is a comparator for detecting the temperature of the second part, and 19 is for detecting an abnormal temperature rise in the first part. Comparator for
, 2o is a comparator for detecting an abnormal temperature rise in the second part, 21.22 is a diode, 23.
24 is a resistor, 25 is a PNP transistor, 26.27 is a resistor, 28 is a PNP transistor, 29 to 32 are resistors,
33, 34 is an NPN) transistor, 36 is a first power side 6-bay 7 control element (hereinafter referred to as a relay), 36 is a heating element in the first part, 37 is an abnormal overheat detection element for the heating element 36 in the first part, 3
8 is an electrode wire of the heating element 36 of the first part, 39.40 is a resistor, 41.42 is a diode, 43 is a thyristor, 44 is a resistor, 46 is a second power control element (hereinafter referred to as a relay)
46 is a heating element in the second part of the main body, 47 is a heating element abnormal overheat detection element in the second part, 48 is a heating element electrode wire in the second part,
49゜5 old resistor, 51.52 is a diode, 63 is a thyristor, 54 is a resistor, 65.56 is a resistor, 67 is a temperature over-rise detection voltage setting section, 68 is a beam iodine failure,
Rage iodine failure and overtemperature rise detection unit that detects abnormal temperature rise of the main body, 59 is a part of the buzzer, 6o is a switch, 61
62 is a first energization control section, and 62 is a second energization control section.

To each input/output terminal of the microcomputer 4, connect the voltage ■2 generated by the power supply circuit 3 to the terminal vDD, and connect GND to the terminal VSS (G N
D) -,, -The output of the reset circuit 5 is sent to the RESET terminal, the output of the clock generation circuit 6 is sent to the CLOCK terminal, the output of the AC synchronization signal generation circuit 7 is sent to the INT terminal, the display section 8
is to the 6 beno Po1o terminal, and the temperature setting part 9 of the first part is P work. The temperature setting section 10 of the second part is connected to the PI4 terminal, the switch section 11 is connected to the PI5I5 terminal, and the D/A conversion section 12 is connected to the P terminal. 1~
The output of the comparator 17 goes to the PIt terminal, the output of the comparator 18 goes to the PI2 terminal, and the cathode of the diode 21 goes to the Po7 terminal. 9 terminal, the cathode of diode 22 is P. 8 terminal, the base of NPN transistor 330 is connected to P through resistor 31. 12 terminal, the pace of the NPN transistor 34 is connected to the P terminal through the resistor 32, and the buzzer part 69 is connected to the P terminal. Connect to 11 terminals respectively.

Now, let's look at the flowchart of temperature signal processing by microcomputer 4.
As shown in the figure. After initial processing (step S1),
Input port PI3 for signal from temperature setting section 9 of first part
The temperature setting value DI3 of the first portion is taken from the temperature set value DI3 (step S2). Next, the signal from the temperature setting unit 10 of the second part is input from the input port P, and the temperature setting value D of the second part is input.
I. Step 4 (Step Ss). Next, the A/D conversion value of the temperature signal voltage vT from the temperature detection unit 9 of the first part is input from the input port P11 and set as DIt (step S4).
.

Subsequently, the temperature signal voltage v from the temperature detection section 10 of the second part
Input the A/D conversion value of T2 from input port PI2 and
2 (step S6). In the next step S6, DI
. and Dlh, and if DI3≧D11, then P.

12, timer 1 is started (step S7) and the process proceeds to step S9. Timer 1 counts up every second.

DI3〈If Dll, output port P. 9. Po12kH
1 signal is output (step SS), and the process proceeds to S9.

Output port P. If 12 is Hi, the NPN transistor 33 turns on, drives the relay 36, and turns on the heating element 36.
energize. In step S9, DI4 and DI3 are compared (step S9), DI. >P for DI3. L on 12
Start timer 2 (when the heating element is de-energized so that the O ratio output is output).
Step 510), proceed to A.

Timer 2 also counts up every second. If it is D14 j3, it is output port P. 8. In order to output a Hi-fold signal to Po13, the process proceeds to step 511) and A (step 512). A(
In step 512), it is determined whether or not timer 1 has started, and if it has started, the process advances to step S13. In step S13, it is determined whether or not the timer 1 has counted up. If the timer 1 has not counted up, the timer counts up until the timer has counted up. If it has counted up, the process advances to step 814, and the output port P is output. 9, the LO ratio output is outputted (step 814), and the process proceeds to step 815. Stats 7
``If timer 1 is not activated in S12, step S
Proceed to step 15. In step S15, it is determined whether or not timer 2 has started, and if it has not started, the process proceeds to B. If the timer 2 is activated, the process advances to step S16 and it is determined whether the timer 2 has counted up. If the count is not up, the timer counts up until the count is up, and if it is, the process advances to step 817 and the output is performed. Output the LO ratio output to 8, and B (step 2)
go to The microcomputer processes the temperature signal as described above.

In FIG. 8, a detection circuit for detecting a failure of the 68 beam and an excessive temperature rise of the main body is shown. First, to explain the temperature over-rise detection method on page 9, the DC voltage v1 generated by the power supply circuit 3 is divided by a resistor 56.56 to obtain the temperature over-rise detection voltage VRF. When the temperature signal voltage vT1 of the first portion becomes smaller than the temperature over-rise detection voltage RF (the temperature has risen abnormally), the output of the comparator 19 becomes Lo. Therefore, the transistor 28 turns on and outputs a signal to the gate of the thyristor 43, and the relay 36 turns on.If the heating element is energized, a large current flows through the resistor 39, causing the resistor 39 to generate heat and cause the temperature fuse 2 to rise. fuse. Similarly, when the temperature of the second part rises abnormally, the temperature signal voltage vT2 becomes smaller than the temperature over-rise detection voltage ■RF, the output of the comparator 2o becomes LO, and the transistor 25 turns on.
Then, the thyristor turns on, the resistor 49 generates heat, and the temperature fuse 2 is blown.

Next, a contact welding detection method will be explained. To explain the method for detecting a fault in the first part of the trench, as explained in the microcomputer's signal processing flowchart, if the A/D conversion value DIt of the temperature signal voltage vT1 of the first part is smaller than the temperature set value DI3 of the first part, the voltage will change to 1o. 1/ (The main body temperature is higher than the set temperature), Po12.

Outputs a signal, simultaneously activates timer 1 and starts timer counting. At this time, the transistor 33 is 0FFI. Timer 1 counts up in 1 second and goes to Po9.
A specific output is output, and the transistor 28 is turned on to output a gate signal to the thyristor 43. Transistor 33 is OF
F, so if it is normal, the relay contact 36 is open and the resistor 39 is de-energized, so it does not generate heat, but if a short circuit occurs, the relay contact 3
6 is in a short-circuited state, so the resistor 39 generates heat and blows out the temperature fuse 2. The second part glue iodine fault detection method is similar, and if DI2 is smaller than DI4, P. L on 13
Outputs an O times signal, simultaneously activates timer 2 and starts timer counting. At this time, the transistor 34 is turned off. Timer 2 counts up in 1 second and goes to Po8.
A specific output is output, and the transistor 26 is turned on to output a gate signal to the thyristor 63. Transistor 34 is OF
Since it is F, the contact point of relay 46 is 1 in normal condition.
1. The resistor 49 does not generate heat when the vane is open, but if a short circuit occurs, the resistor 49 generates heat and blows the temperature fuse 2. The reason for providing timers 1 and 2 that count up every second is to ensure a delay time for the relay contact to transition from a short state to an open state (Po12).
and PO2" cannot output an output signal to 013 and P08 at the same time).

As described above, short-circuit failures and overheating of the main body are detected.

Problems to be Solved by the Invention In this type of floor heating system, the first and second parts of the main body are separately and independently detected for failure of the adhesive and temperature rise, which increases costs due to the large number of parts. Signal processing is 2
There was a serious problem of an increase in program memory due to the partial requirement. In addition, when detecting overtemperature rise, even if the AC power supply voltage fluctuates and the temperature of the main unit fluctuates accordingly, the DC power supply voltage remains constant, so the temperature overrise voltage value also remains constant. There was also the problem that excessive temperature rises could not be detected accurately.

A foolproof way to solve problems In order to solve the above problems, the present invention has a first aspect.

First and second rectifying elements are connected to each contact of the second power control element, and each output is connected to a third power control element via a resistor, and the first and second rectifying elements The short-circuit failure detection section of the power control element controls the supply of electricity to each of the power control elements.

The configuration is such that an OR output of the output to the second switching element is output, and the temperature over-rise detection section outputs a temperature-over-rise detection voltage output signal that outputs a correction output according to AC power supply voltage fluctuations, and the first,
The temperature signal voltages of the second part are each compared and AND outputted, and the third power control element is triggered by the AND output of the power control element short failure detection section output and the temperature over-rise detection section output. It is structured as follows.

Operation According to the above configuration, the OR output of the short circuit failure detection section of the first and second power control elements of the current-carrying section of the first and second parts of the main body, and the detection of each temperature rise of the first and second parts. Equipped with an abnormality detection section that detects abnormalities at 13 bases per inch by AND output with the AND output of the section, it is possible to significantly reduce costs by reducing the number of parts, and it is also possible to use program memory efficiently. Become.

Further, since the temperature overrise detection section is provided with a correction section so that the temperature overrise detection voltage value becomes a value corresponding to AC power supply voltage fluctuations, it is possible to always accurately detect a temperature overrise.

EXAMPLE An example of the present invention is shown in FIGS. 1, 2, 3, and 4.
This will be explained using FIG. In FIG. 2, parts that are the same as those in FIG. 7 are given the same numbers. FIG. 1 is a schematic block diagram of the present invention, FIG. 2 is a circuit diagram of the present invention,
Figure 3 is a block diagram of temperature control of the main body using a microcomputer, Figure 4 is a flowchart of temperature signal processing by the microcomputer,
FIG. 6 is a top view of the main body of the floor heating device. FIG. 1 is a schematic block diagram of the present invention. For details on the operation, please refer to the second
This will be explained in the following figures, so I will briefly explain it here. First, regarding the temperature control of the first part of the main body, a correction signal obtained by correcting the signal of the first temperature detection section 14A-7' based on the output of the power supply voltage fluctuation detection circuit is compared with the signal of the first temperature setting section 9. If the set temperature is higher than the detected temperature (corrected temperature), a Hi times signal is output to the first energization control section 61 to energize the first heating element. If the set temperature is lower than the detected temperature (corrected), a Lo times signal is output to 61 and no current is applied. The temperature control of the second part of the body is also similar to the temperature control of the first part. The temperature over-rise detection correction voltage setting section 64 sets a voltage for detecting an abnormal temperature rise of the main body according to the output of the power supply voltage fluctuation detection circuit 63, and the first temperature detection section 13
and the output voltage from the second temperature detection section 14, and the AND output and the thyristor 43 are connected. When either the first or second part detects an abnormal temperature rise, a gate signal is output to the thyristor 43.
3 turns on and melts the temperature fuse 2. Po8 outputs an OR output of a signal to the first energization control section 61 and a signal to the second energization control section 62. In other words, if the outputs to the first and second energization control sections are both Lo, a gate trigger signal is output to the thyristor 43, and if the first or second 15 base/current energization control section is short-circuited, the temperature Fuse fuse 2. In the above state, output a high signal to either the first or second energization control unit (temporarily set to 61),
If the other one has a short-circuit failure (let's say 62), it cannot be detected immediately, but the output to 61 will output a Lo times signal when the temperature of the main body reaches the set temperature, so it can be detected at that time. The time it takes for the main body temperature to reach an abnormal temperature in the event of a short-circuit failure is much longer than the time it takes for the signal 61 to change from Hi to Lo, so it is highly unlikely that an abnormal state will occur.

In the unlikely event that an abnormal temperature is reached, the overtemperature rise detection section is activated.

Therefore, there is no problem in detecting a short circuit failure in the energization control section using the above method.

The thyristor 43 is configured to output an AND output of the OR output of the short-circuit failure detection section of each energization control section described above and the AND output of each overtemperature rise detection section.

Now, the operation will be described in detail using FIG. 2, in which the above-mentioned block diagram is replaced with an actual circuit.

In FIG. 2, 63 is an AC power supply rectified voltage vA generation circuit;
64 is a temperature over-rise detection correction voltage RFG setting section that outputs a correction output according to AC power supply voltage fluctuations, 66 is an abnormal temperature detection section in the controller of the main body, 66 is a comparator for detecting abnormal temperature rise, and 67 is a Comparator for detecting AC power rectified voltage value, 68 to 69 are resistors, 7o
is a diode, 71 to 73 are resistors, 74 is a PNP) transistor, 75.76 is a diode, 77 is a temperature sensor of the first part, 78 is a temperature sensor of the second part, 79 is a power element short-circuit failure, common detection of temperature rise It shows the part.

Other circuit parts are the same as the conventional example.

To the input/output terminals of the microcomputer 4, the output of the comparator 66 is connected to the PI7 terminal, the output of the comparator 67 is connected to the PI6 terminal, and the cathode of the diode 21 is connected to the P terminal. Connect to each of the 8 terminals. Connections of other parts to the microcomputer input/output terminals are the same as in the conventional example.

Figure 3 is a block diagram of the microcomputer control of the temperature of the main body, and shows the A/D conversion of the AC power supply rectified voltage vA, which is the converted value converted by the 17 Beno A/D converter connected to the same DC power supply voltage 2. (DI), the A/D conversion value (DI, ) of the temperature signal voltage vT1 of the first part, and the A/D conversion value (DI2) of the temperature signal voltage vT2 of the second part are input to the correction section. The correction section uses DIl and DI2 based on DIs.
Then, the correction value D11c of Dll and the correction value DI2C of DI2 are calculated. In the first part, the correction value D11c of the A/D conversion value of this first part and the temperature set value DI of the first part. is compared, and the comparison signal output controls the heating element drive section of the first part, thereby controlling the energization of the first heating element. Similarly, in the second part, D12c and DI4 are compared, and energization of the second heating element is controlled based on the comparison signal output. Also, OR the outputs of each comparison section and output the output port P of the microcontroller. Output to 8. FIG. 4 is a flowchart of temperature signal processing by the microcomputer, and although some parts overlap with the explanations in FIGS. 3 and 9, they will be explained in order of steps.

After initial processing (step S1), a signal from the first temperature setting section 9 is taken in from the input port PIa and set as the temperature set value DI3 for the first portion (step 818). Next, the signal from the second temperature setting section 1° is taken in from the input port PI4 to obtain the temperature set value DI of the second section. (Step 519).

Next, vA generated by the AC power supply rectified voltage vA generation circuit 63
The A/D converted value of is inputted from the input port PI6 and set as DI6 (step 320). Next, input the A/D conversion value of the temperature signal voltage vT1 of the first part from the input port PIt, and
ll (step 521).

Next, the A/D conversion value of the temperature signal voltage vT2 of the second portion is inputted from the input port PI2 and set as DI2 (step 5
22). In the next step S23, Dl corresponding to DI6
A correction value DItC of l is calculated (step 523). In the next step 824, a correction value DI2C of DI2 corresponding to DI6 is calculated (step 524).

In the next step S2s, DI. Compare and Dllc, if DI3>DI, c then P. In step 12, the Lo ratio output (heating element 36 is de-energized) is selected (step 526), and the process proceeds to A (step 828). DI3 <P for DIIC. 8
゜Output a high signal to P012 Step 527), A
Proceed to (step 28). 19 if Po12 is Hi
The transistor 33 is ONI and energizes the heating element 36. A (step 828) compares D■4 and DI2c, and if DIa <DI2C, then P. 8. Hi to Po12
In order to output the double signal (step 529), the process goes to step 818. If Po13 is Hi, transistor 34 is ON
Then, the heating element 46 is energized. If DI4≧DI2c, P
. , 3, the LO high output is outputted (step 530), a timer is started (step 31), and the process proceeds to step S32.

In step S32, it is determined whether the timer has counted up. If the timer has not counted up, the timer counts up until the timer counts up. If the timer counts up, the process advances to step S33. P in step S33. 8, the LO high output is outputted, and the process goes to B (step 818). The timer is 1
It is assumed that the count is increased in seconds (1S).

The microcomputer processes the temperature signal as described above.

Now, FIG. 2 79 shows an abnormality detection section that detects a short-circuit failure of a power control element (hereinafter referred to as a relay) and an excessive rise in temperature of the main body, and this detection section will be explained below.

First, I will explain how to detect excessive temperature rise of the main unit.
64 is a temperature over-rise detection correction voltage vRFc setting unit that outputs a correction output according to AC power supply voltage fluctuations, and the temperature signal voltage of the first part ■T1-1. When the temperature signal voltage vT2 of the second portion becomes smaller than vRFc (the temperature of the main body has increased abnormally), the common output of the comparators 19 and 20 becomes LO. (In other words, AND of comparators 19 and 20
output to the cathode of diode 7o). Then, the transistor 28 turns on and outputs a gate signal to the thyristor 43, and if the relay 35 or 45 turns on and the heating element 36 or 46 is energized, a large current flows through the resistor 39, causing the resistor 39 to turn on. It generates heat and blows out the temperature fuse 2.

The resistors 71, 73 and ) Syndistaff 4 form a negative feedback hysteresis circuit, and the transistor 74 turns ON at the same time that the common output of the comparators 19, 20 becomes Lo.
, Raise the RFc voltage a little and comparator 19
, 20 so that the output is stable.

Next, a relay short failure detection method will be explained. As explained in the flowchart of temperature signal processing of the microcomputer in FIG. The correction value DI2c of the A/D conversion value of the temperature signal voltage vT2 is the temperature set value DI of the second portion. (Both first and second partial temperatures are above the set temperature)
If so, start the timer and start counting. At this time P. 12°Po13 has a Lo ratio output, and both transistors 33 and 34 are OFF. The timer counts up in one second, outputs a high LO output to Po8, turns on the transistor 28, and outputs a gate signal to the thyristor 43. In other words, P. 12 and P. The OR output of 13 outputs is P. It will be output to 8. (The reason why the timer is set to 1 second is to ensure the delay time of the relay as explained in the conventional example.) Since the transistors 33 and 34 are 0FFI, the relay of 35 and 45 is in a normal state. The contact point is O22/
Although it is in an open state, if either of the contacts 35 or 45 is short-circuited, the relay contacts are short-circuited, so the resistor 39 generates heat and blows out the temperature fuse 2.

As described above, relay short failure and temperature over-rise detection are configured to trigger the thyristor by AND output of the output signals of the two detection sections (the thyristor is triggered when the AND output is a high LO output).

In the diode 76 in Fig. 2, only the first part is energized f7)
This is to prevent erroneous energization in which the heating element in the second part would also be energized in the relay 36-diode 75-heating element 46 path if the diode 76 were not present when the relay 35 was OFF.

Diode 76 is also used for a similar purpose.

Effects of the Invention As described above, according to the floor heating apparatus of the present invention, the OR output of the short failure detection part of the first and second power control elements of the energization control part of the first and second parts of the main body and the 23・A with the AND output of each temperature over-rise detection section of the first and second parts
Since an abnormality is detected by ND output, costs can be significantly reduced due to the large number of parts. Furthermore, the program processing method becomes simpler, and program memory can be used more efficiently. In addition, since a correction section is provided in the temperature over-rise detection section so that the temperature over-rise detection voltage value becomes a value corresponding to AC power supply voltage fluctuations, an over-temperature rise in the main body can always be accurately detected.

[Brief explanation of drawings]

Figure 1 is a schematic block diagram of a floor heating system that is an embodiment of the present invention, Figure 2 is a circuit diagram of the same, Figure 3 is a block diagram of temperature control, and Figure 4 is a temperature signal processing diagram of the microcomputer. Flowchart, Figure 6 is a top view of the main body of the floor heating system, Figure 6 is a circuit block diagram of the floor heating system equipped with a general microcomputer, Figure 7 is the circuit diagram, and Figure 8 is the temperature of the microcomputer. It is a flowchart of signal processing. 9... First temperature setting section, 10... Second temperature setting section, 13... First temperature detection section, 14...
・Second temperature detection section, 17...first comparison section, 1
8... Second comparison section, 35... First power control element, 36... First heating element, 46...
Second power control element, 46... Second heating element, 6
1...First energization control section, 62...Second energization control section, 77...First temperature sensor, 78
... Second temperature sensor, 79 ... Abnormality detection section.

Claims (2)

[Claims] (1) A first heating element that heats the first part of the main body, a second heating element that heats the second part, and first and second temperature detection that detects the temperatures of the first and second parts. and the said first;
a temperature setting part for setting the temperature of the second part; a comparison part for comparing the respective signals; and a temperature setting part for setting the temperature of the second part;
first and second energization control units that control energization to the second heating element; a short-circuit failure detection unit that detects a short-circuit failure in the first and second energization control units; an over-temperature rise detection section that detects an abnormal temperature rise in the second portion; and an abnormality detection section that detects an abnormality by AND output of the OR output of each of the short-circuit failure detection sections and the AND output of each of the above-mentioned over-temperature rise detection sections; A floor heating system comprising: (2) The floor heating apparatus according to claim 1, wherein the temperature overrise detection section is configured to perform correction according to AC power supply voltage fluctuations.