JPS598003A - Make-break controller of load - Google Patents

Abstract

PURPOSE:To avoid danger with a device which controls the make/break of the heater load of an electric blanket, etc., by turning off a switching element if a control circuit has a fault. CONSTITUTION:The temperature detecting voltage Vd is supplied to sampling circuits 96 and 97 for sampling. An operational amplifier 46 compares the sampling result signal Vd1 with the 1st reference voltage Vr1. At the same time, an operational amplifier 51 compares the sampling result signal Vd2 with the 2nd reference voltage Vr2. Then a thyristor is driven by the output of the amplifier 51. Thus it is possible to turn immediatey off a switching element which controls the load even in case not only a safety circuit and a maintenance device but a comparison control circuit that monitors the fault of said safety circuit and maintenance device has a fault precedently.

Description

[Detailed description of the invention]

[Technical Field of the Invention] In this section, a switching element C is controlled by a control signal synchronized with an AC power source to control loads such as an electric blanket or an electric carveler 1 to a power generator. The power on/off control of the loaded load is fully controlled. [Technical background of the invention] Conventionally, in the case of this type of heater, etc., which generally electrically control the load m'+-r, the control amount 1 path and the temperature IU Renley rlQ
In order to deal with the risk of the humidity of the load such as the heater being controlled rising to a high level in the event of a failure, or the control element breaking down, we have installed a disconnection detection circuit for the temperature at a low temperature, a field lightning detection circuit for the control switching element, etc. Incorporate a safety circuit into the 11 control circuit or install a temperature control circuit in a separate system from the 11 control circuit.
In order to avoid these dangers, safety devices such as In the event that a circuit or safety device fails, it is possible to avoid the dangers described above. [Objective of the Invention] The present invention has been made in view of the above circumstances, and A first comparator controller is installed that constantly monitors whether the safety circuit and safety device are in operation or not. Even if the first comparison control circuit to be monitored fails first, the switching element that controls the load is immediately set to the OFF state in the event of a failure in the control circuit, thereby preventing any danger from being energized to the load. (Summary of the Invention) The present invention provides a circuit for outputting a synchronized pulse in which a detected voltage and a first reference voltage are synchronized with an AC power supply. C is compared to the first comparison control circuit 11 while ringing, and when the first comparison control circuit outputs an output signal synchronized with the synchronization circuit, the detected voltage F' and the second base i1 voltage 11-
While ringing the output signal, it is compared to the second comparison control circuit, and the switching element is energized only when the output signal from the second comparison control circuit is synchronized with the synchronization circuit. η, so that when the circuit fails, the output of the second comparison control circuit becomes DC. (Embodiment of explanation) The first embodiment of the present invention will be explained below with reference to Figs. In other words, FIG. 2 is a diagram showing the overheat sensing heating wire 2, in which a heating wire 21), which serves as a heating element, is wound around the core yarn 2a, and a predetermined There is a type C which is coated with a nylon layer 2C that melts at temperature, and further has an overheat sensing wire 2 (1) wound around it and an electrically insulating coating 2e applied to the outside. One conductor 3b is wound around the core thread 3a, and a heat-sensitive layer 3C having an impedance characteristic of a negative temperature coefficient is provided on it.

), and then the other conductor 3 (1) is wound around J-, and electrical insulating liquid 13e is poured on the outside of C. On the other hand, 4 and 5 are a pair of AC power terminals, and between them A series circuit is connected between the heating wire 2h, a switching element such as a switch, and a temperature regulator as a safety device. 8 is a variable resistor for temperature setting, 9 is a fixed resistor, and these are heat-sensitive. The impedance of the heat sensitive layer 3C of the body 3. It is connected between the C AC power supply terminal 4゜5〕 via the sensing wire 2d, the heater 10 that heats the Takido Hikoze 7, and the temperature Hikoze 7, and the conductors 3b and 3d have resistors. 11.12.13
and ] A voltage dividing circuit 15 consisting of a capacitor 14 is connected. On the other hand, 16 is a DC power supply circuit, and resistor 17. Tsunadai A-do 18°tiode 19 and 20. It consists of capacitors 21 and 22. 23 is a synchronous circuit, which is a full-wave rectifier 2 consisting of four tie motors 2/Ia to 2/Id.
4. Resistance 25 to 29. It consists of transistors 3o and 31. 32 is a detection voltage generation circuit, and C temperature detection 1] 1 circuit includes Tsuebugui 71-1, 33 and 317+Beambu 35. Dia 1-1・30. Resistance 37. Con-in-li-3
Consists of 8. 39 (Y4 non-bringing goo 1-circuit, the first reference voltage generation circuit /11 consisting of seven ties 7t-1' /IO and resistors /12 to /I/1.l.
4T from Runsistor/I5. /I6 is an open director type A pair as a first comparison control circuit. /17 is the goo 1-circuit C for limp ring, the second reference voltage generating circuit 48 consisting of 13 ties, t-1, 48a to 48c, and the resistor '19. ! It consists of '+O. Reference numeral 51 designates an A pair of amplifiers as a second comparison control circuit. 52 is an ignition control transistor,! 53 to 5) 0 is resistance. 56 is the direct current a, 15 is the ignition cone acting as a noilter, and 5) 7 is the resistor 1i'Lr.
be. 58 and 59 are resistances and -1 for Kanonbo IJ-
There are 4 C's. 60 is a detection circuit that detects and covers the Δn and A of the relay register 6;
A full-wave rectifier circuit 61 consisting of 6i d, and resistors 62 to 68,1-rangistoro 9 to 733 yen. Guioto 74
and 75. 76 is a failure detection circuit that detects a failure of the relay register 6, and a resistor 77 PJ to 83, = 1 ndenri 8/I, two ties 71-1 to '85) and 86.14
Penumbu 87. i to transistor 88. 89 is a heater that heats the temperature hikose 7, 90 is a diode, 9
1 prevents the heater 89 from being energized! II Ru Illista,
92 is an ignition resistor, and 93 is a resistor. In addition, the DC power supply circuit 16. which is located within a3 (dashed line)-) in FIG. Detection voltage generation circuit 3ε3. Goo 1-Circuit 3
9. Openo 7 Enzo 46. Circuit to goo 1/I7. A Peno 7
Nbu 51. Detection circuit 60. The components of the failure detection circuit 7 (3, etc.) are integrated circuits (housed in one IC battery, and each component outside the broken line P is connected externally (-). Next, the above configuration is The action of the following will be explained. When the AC power supply vAC is applied between the AC power supply terminals 4 and 5, the impedance of the variable resistor 8, the fixed resistor 9, and the heat-sensitive layer 3C, the conductive holes 2d and I suddenly change to the west of 10. Current flows through the column circuit C, conductor 3b,
AC detection voltage TE with heat sensitive layer 3ctJC minj1 between 3i
If fl V s is formed, the voltage is further divided by resistor 11.12 and resistor 13.1 by 1/IU (-15>
The detected voltage If Vi is output to the output terminal r of the jE l path 15, and is input to the non-inverting input terminal of the A pair 35. 15 (a) and (C)]. Therefore, the impedance of the heat-sensitive layer 3C changes in accordance with the temperature of the electric blanket body 1. AC detection voltage VS generated between 3i and minute n-circuit 15
The detected voltage V1 outputted from the electric blanket body 1 follows the temperature of the electric blanket body 1. The detection voltage V1 inputted to the temperature detection circuit 32 via the C1 voltage dividing circuit 15 is buffered and amplified by the A amplifier 35, and this is the tie;
The DC current is rectified by the converter 38, and the DC current is smoothed by the compensator 38, and the DC current is detected by the DC detection claw.
Reference 1o -) (, Target current detection voltage 1.:lVd is a voltage that depends on the temperature of the electric blanket body 1 by jβ. -1j, 2■
An alternating current voltage with a constant maximum value is generated across the busbars 0/l and 9 F), and is rectified by a diode 20 and electrolyzed = 1 ndenry-2.
1 (smoothed low voltage DC voltage (V CC-vee)
is applied. Since the voltage Va shown in FIG. 5(b) converted to DC is applied to the IJ full-wave rectifier 24 between the base and emitter of the transistor 30 of the synchronous circuit 23, the transistors 1 to 30 are connected to the AC power source. Terminal 4. ! When the AC power supply applied during the interval is near zero voltage, the AC power supply is shut off synchronously, and the transistor 31 conducts when the transistor 30 is conductive, and the C collector becomes LO level (Vee), and when the transistor 30 is shut off, the The voltage is cut off to 11 levels (VCC), and the waveform Vp shown in Fig. 6(C)
is output. -h, t- The transistor 45 becomes conductive when the T2 level is applied to the base, and the C collector becomes 1. ．．
0, and at this time, the first reference voltage generation circuit 4
1 is enabled and the common connection point of the diode 40 and the resistor 43, which is the output terminal of the gate [j+l path 39, is equal to the forward voltage IF drop of the seven diodes 40 (approximately 0.7V x 7
), the voltage VCC of bus 9/I is approximately 4.9
This results in a low first reference voltage -Vrl. In addition, this 1-run transistor 45 is cut off when the LO level is applied to the base, and connects the output terminals of the circuits 39 to 1-1 (V).
CC). Then, since the output of the synchronous circuit 2J3 is given to the base of the transistor 45, the reference voltage -vrl of 7t11 is rimmed by the synchronous circuit 23 and applied to the output terminal of the gate circuit 39 as shown in FIG. 5(C). A sampling result signal v1 is output. Then, the DC detection voltage Vd output from the temperature detection circuit 32 is inputted to the non-inverting input terminal of the operational amplifier/I6,
The ring link result signal V1 of the circuit 39 is input to the inverting input terminal of the operational amplifier/16, and both signals C1 and C1 are compared by the operational amplifier/16. Therefore, the DC detection voltage Vd output from the C1 temperature detection circuit 32 is the same as the first standard 1ff when the circuit operates normally and the warm stone of the electric blanket body 1 is wet in the room. It is designed to output a value higher than -Vrl, so v1=-Vl<4
Then, when Vd is higher than -Vr1, A)7/
I6 becomes A, and when the other Vd is lower than -Vrl, A')7'I6 turns on. Then, the common connection point of the diode /18c and the resistor /'I9 of the gate circuit 47 becomes f due to the forward voltage drop (approximately 0.7V (The second reference voltage f [-V C2 is about 2.1 V lower than the voltage VCC of the j line 9/I. The common connection point between the output terminal door, the resistor 50, and the inverting input terminal of the A bare amplifier 51 is connected to the output of the A bare amplifier 46, and a non-bringing result signal V2 is shown in FIG. 5(d).
1, when this signal V2LL is near the zero voltage of the AC power supply, it becomes -Vr2, and at other times it becomes vee. Then, the signal v2 is input to the inverting input terminal of the operational amplifier 5)1, and the DC detection voltage LIV d is input to the non-inverting input terminal QM1 of the amplifier I51. Preferably, when the temperature of the electric blanket body 1 is 1°C higher than the set temperature, the electric UVd is d5C during the period 11 when the peak voltage (voltage VrO) of the signal v2 is low, J.
is the output voltage V of the operational amplifier 51. is a waveform that decreases from Sγ to voltage Vce near the zero voltage of the AC voltage, and the electrician 1j wooden body 1's tuning fa is higher than the set temperature J- (and the voltage Vd is higher than the lamp Vro for a period [2 In 13, the output voltage v of Apeno7inzo37 is
01 becomes a constant electric ff waveform equal to electric F-CC [5th
See figure (e)]. Since this output voltage VO] is manually applied to the base of the I non-transistor 52 via the resistor 5]3, in the period 11 there is a voltage d3 (the voltage l1-VO+ is l +,, 0,
Transistor 5
2 or continuity C-J rectifier Vc or l! 7/L, [5th
Diagram [see >], Figure (1
) shows J, sea urchin AC power supply:? The electric charge F1j is nearby and the stored charge is the gate current 1.
The current flows in /υC1 at g doji /υC1 The relay resistor 6 conducts during the positive half cycle of the AC power supply, so that AC voltage Vl+ is applied to both ends of the photothermal line 2jT as shown in FIG. 5(h)C. , Bennetsusen 2 Rika Hikari Netsu Riruru J, Uninari, also period 2
At , the re-lister 6 is blocked U+i. Therefore, in the above configuration, when the electric current J-i', Vs, which is distributed between the C conductors 3b and 3d via the impedance shown in the heat-sensitive diagram 3C of the C1 heat-sensitive body 3, is about 50 V, the electric blanket main body 1 What is the temperature setting, and the electric blanket body 1 is 69
When the voltage is lower than the constant voltage, the voltage -Vs is 5i 0 V or higher.
I have set it up like this. And Lee Ilista (3
When j is quickly turned off, the relay resistor 6 is connected in parallel between the j' node and the cathode through a resistor 62, and the 1c full-wave rectifier 6 is connected during the period shown in Fig. 3 (a). Since an AC power source (not shown in 1a) is applied, a full-wave rectifier (electrical lamp 0 converted to DC at 51) is applied between 1 of the detection circuit 60 and the base/nimitter of the Lancistro 9.
The transistor 60 is turned on and off in synchronization with the AC power supply at the same timing as the transistor ζ30, and the collector voltage v1 of the transistor 71 becomes as shown in FIG. The output voltage vp and voltage ffV+ of the synchronous circuit 23 are combined via the OR gate circuit 72 and the transistor 73
The detection voltage Va is output to the collector of , and when the detection voltage Va is at the LO level, the converter 1 node 84 is charged, and the voltage V
When 01 is at the LO level, the transistor 78 is turned on and the charge stored in the capacitor 18/l is discharged, and the period 1-
At a, the voltage Vca at the non-inverting input terminal of the A dominant ε3f becomes qJ, as shown in FIG. 6([)C. On the other hand, the inverting input terminal of the operational amplifier 87 receives the limbling result signal V.
Voltage V3 that increases tt I- is input in synchronization with J5.
Then, the voltages Vca and V3 are compared with the operational amplifier 87C. Then, when LJ3 is in period ``a'', charging and discharging of capacitor υ84 is performed periodically.
Figure (1)) shows (J: sea urchin l' HI J level C1 ~
The Runsistor 88 is cut off, and the Noiristor 91 is cut off. However, when the four Noiristors 6 fail and the withstand voltage in the forward/) direction decreases, the operational amplifier 51 output voltage J', V01 is r +-
Is there an ignition signal to the gate of relay register 6 at the 11J level?
Even though the voltage Vscr between the 1st node and the cathode of the Noiristor 6 exceeds the withstand voltage, it becomes conductive [see Figure 3 (a)]. When the C thyristor 6 becomes conductive in a faulty state, the heat generation 1 m 2 b becomes conductive, but the full-wave rectifier 61 of the detection circuit 60 no longer produces an output, and the circuits 1 to 9 are cut off when the thyristor 6 becomes conductive. Transistor stuff 1 conducts, and the electric current Hg V I becomes l' 1. O
J Rehe) Lt (Vcc) Tol, rV), Electric uVa
is l' L Oj level (Ve
e) Since the battery is charged, the voltage LFV ca becomes lower than the peak value of the voltage v3 at low FI, 11). Then, the voltage VO213 at the output terminal of the operational amplifier 87 increases in synchronization with the peak value of the voltage v3.
- As shown in Figure 6 (1) near zero voltage of AC power supply. 0] level, and the relay register 91 becomes conductive and C
J-989 is energized and the temperature heater is heated FJII
fI, and the current supply to the heating wire 2b is cut off. In addition, when the withstand voltage in the reverse direction of the relay resistor 6 decreases, power is applied to C-98 [) through tie A-F90, and the heat 1-sphere is heated and melted to 'C light beam 21). The power is cut off. According to the above configuration, the sensing line 2d + 'R body 3d, the resistor 10. Resistor 12, connecting wire 4j゛14, etc. are disconnected, and the absolute value of voltage V i is always noticeable.'<E-3 114
is countercurrent detection %t-E V d KaPi 'I (1)
M'P-Electric IJ-V rlJ,') (L(<<f
Since the A and 4f rerinsoring result signal v2 is equal to Vee and <r, the U71 pair 46 is
1's output V (14 is always at 1-111 J level, the = lucta of transistor 52 is l L OJ level,
The relay register 6 is cut off. Also, when the voltage tr v r becomes lower than 1i, the voltage V(l becomes higher and Vcc
If the difference is greater than or equal to Vr2, the electrician's 4i main body 1 will be in the same state as when it is in a high state, so the relay lister 0 will be shut off. On the other hand, ll-1] period circuit 2), guru circuit J39.
Δbenonone 146. Circuit/17 to Goo 1 and Abe 1 No.;) 1 are connected in series to jl? Be (FQ Rirare l' d3
When the output of 1 (in the operational amplifier) has a so-called pulse-like waveform C, only then (Neurister 6 becomes conductive and Ca
Therefore, for example, when the pulse-like waveform becomes louder, the circuit 231) to the circuit 39) drops by -19.
The output after Δpage/'IO becomes a constant bell of l'l-11J or I't, -OJ.
In case of failure of +6 and goo 1~circuit/17! The output of the operational amplifier 1) 1 is 1-11N, and the output of the pulse-like waveform is 1-11N.
0, it becomes a constant level, and even when the operational amplifier 5) 1 or 1-run raster 552 itself fails, the output of the people is still constant. With the lightness of (ko(t(l)・rLOJ
Since no change occurs, the relay register 6 is continuously set to 'aIlli'. Circuit 39゜A to Goo 1 arranged in series with Soru and Goo 1
Beno7inzo/16. If one of the circuits 1 to 17 and the operational amplifier 51 fails, Illistero will be shut off and power to the heater 2 will be cut off in either case, so it is assumed that a circuit failure has occurred. I and C are also electricians.
In the unlikely event that the lumber body 1 does not overheat, the first comparison control circuit/I6, which monitors whether the safety devices etc. are operating normally, will Even if there is a failure, these safety circuits or safety devices will prevent
It is possible to cut off the power supply to the heater 2b, and
It is possible to improve safety even further. Figures 7 to 9 show a second embodiment of the present invention, which is different from the first embodiment! j'+! I'll explain only the parts. That is, in the first embodiment, the first reference voltage vr1 and the second reference voltage jJ-V r2 are input to the circuit J30 and the circuit /I7, and the temperature detection voltage Vd is
In this second embodiment, one of the input terminals of the Bearshifts 46 and 51 is connected manually.
d to the limp ring circuit 9 (3 and 5) 7 (this person performs C limp ring, and outputs the limp ring ending signal Vd1 and the limp ring circuit 9 (3 and 5) 7).
Compare the standard electric box VR1 with A amplifier/I (
The lean-pulling result signal vd2 and the second substrate wall voltage V1'2 are used to drive the output C relay register 6 of the operational amplifier 51, and the first The effect is similar to that of the embodiment. In this case, the rimbling circuit (6.97) is the transistor 9B to 100. The resistors 101 to 105 are configured as C, and the temperature detection voltage V (-1 is manually inputted via a buffer circuit consisting of an operational amplifier 106.Instead of the relay resistor 6, a switching element as shown in FIG. 10 is used. 1~Use Liatsuk 107 and power 1
""V C may be inverted by the transistor 108 and the resistor 109 and transferred to the groups 1 to 1 of the triac 107, and the relay 6C may be driven, and the relay contact may be used to disconnect the heating wire 2b. (Effects of the Invention) As is clear from the description below, the present invention is capable of monitoring whether the safety circuit and the safety device are operating normally. A first comparison controller is provided to monitor not only the failure of the safety circuit and the safety device but also the failure of the safety circuit and safety HM.Even if the first comparison control circuit fails first, the control circuit will not fail. An object of the present invention is to provide a zero-load power supply/disconnection control device which can immediately turn a switching element that controls a load into an A-off state to cut off current to the load and avoid danger.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is an electric circuit diagram, FIG. 2 is a perspective view of a heat-sensing heating element, and FIG. 3 is a perspective view of a heat-sensitive element. Figure 4 is the main part 10
Figures 5) and 6 are diagrams showing the electric current waveforms in the electric circuit, and Figures 7 to 9 are the diagrams shown in Section 2 of this 5th page.
Figure 7 is a diagram corresponding to Figure 1, Figure ε3 is a diagram showing the specific circuit of the main part, Figure 9 is a diagram showing voltage or current waveforms, and Figure 10 shows an example of the rim. 1 is an electrical circuit diagram of a different embodiment of the present invention; FIG. In the drawing, 1 is the main body of the armature, 2 is the heat sensing bulb and the hot wire, 2b is the light and heat (m<load), 3 is the heat sensitive body, 6 is the switching element), 15 is the component I circuit, and 16 is the DC A power supply circuit, 23 is a Kaimei circuit, 32 is a temperature detection circuit (detection voltage IT generating circuit), 35) is a gate circuit, 41 is a first reference voltage generation circuit, /I61;L: A pair of amplifiers (first Comparison control circuit〉, /I≦) is the second reference voltage generation circuit, 51 is Apeanno (second comparison control circuit), !56
= 1 inch (filter), 60 is the detection circuit, 74
is a failure detection circuit.

Claims (1)

[Scope of Claims] 1. In a switching element that controls a load such as a heater by a control signal synchronized with an AC power supply, the switching element outputs a synchronized pulse signal periodically with the AC power supply. 1111 circuit, a first reference voltage generation circuit, a second reference voltage generation circuit, a detection voltage generation circuit that always changes between the first reference voltage and the second reference voltage, and the first reference voltage generation circuit. Standards of? a first comparison control circuit which non-brings one of Ei LT- and the detection voltage by the synchronous circuit and compares the υ sampling result signal with the first reference voltage J and the detection voltage; When the first comparison control circuit outputs an output signal synchronized with the synchronization circuit, the first comparison control circuit outputs one of the second reference voltage and the detection voltage by one non-shilling, and outputs one of the second reference voltage and the detection voltage to the other signal. It is characterized by comprising a second comparison control circuit for comparing a second reference voltage and a detection voltage, and the output of the second comparison control circuit is used as a control signal for the switching element. This is a single current control device for the load. 2. The load power on/off control device according to claim 11+''!, wherein the output of the second comparison control circuit is supplied to the C switching element via a DC signal blocking filter.