JPH08315959A - Heater circuit - Google Patents

Abstract

PURPOSE: To provide a heater circuit in which the maximum value of peak power supplied to the heater circuit can be minimized even when primary power source voltage is fluctuated by providing a specified composition in a heater circuit with a prescribed structure. CONSTITUTION: This heater circuit is formed of an input terminal 1 to which a primary power source is inputted, a switch element 2 connected thereto to turn on and off the supply of the primary power; a heater 3 connected in series thereto; a temperature sensor 6 for detecting the heater temperature; and an ON/OFF control circuit 9 for turning on/off line switch 2 according to the signal from the temperature sensor 6. This circuit is also provided with a plurality of power regulating heaters 5a-5n connected in series to the heater 3; N- pieces of power regulating switch elements 4a-4n connected in parallel thereto one by one, respectively; an input voltage detecting circuit 7 for detecting the voltage applied to the input terminal 1; and a control circuit 8 for turning on/off the power regulating switch elements 4a-4n according to the signal from the circuit 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater circuit mounted on a satellite, for example.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional heater circuit.
Reference numeral 1 is an input terminal, 2 is a temperature adjustment switch element, 3 is a heater, 6 is a temperature sensor, and 9 is a switch element 2 which is conductive when the temperature detected by the temperature sensor 6 is low, and which is cut off when the temperature is high. The / off control circuit 10 is a heater unit.

The operating principle of FIG. 5 will be described below. When the temperature control switch element 2 is in a conductive state by the primary power source connected to the input terminal 1, current is supplied to the heater 3,
The heater 3 generates heat and the temperature of the heater section 10 rises. When the temperature of the heater unit 10 rises, the on / off control circuit 9 turns off the temperature adjustment switch element 2 by the temperature detection signal of the heater unit 10 from the temperature sensor 6. When the temperature control switch element 2 is cut off, the heater 3
Does not generate heat, the temperature of the heater unit 10 decreases, and
The / off control circuit 9 brings the temperature adjusting switch element 2 into the conductive state again. By repeating the above operation, FIG.
As shown in, the temperature of the heater unit 10 maintains a certain threshold level.

[0004]

Since the conventional heater circuit is constructed as described above, the primary power source connected to the input terminal 1 supplies the heater circuit with the temperature adjusting switch element 2 when it is in the conductive state. Since the peak power generated is proportional to the square of the primary power supply voltage, the peak power greatly fluctuates when the primary power supply voltage changes. Therefore, when the fluctuation of the primary power supply voltage is large, the maximum value of the peak power supplied from the primary power supply becomes much larger than the steady peak power, and there is a problem that a primary power supply having a large capacity is required.

The present invention has been made to solve the above problems, and provides a heater circuit capable of reducing the maximum value of the peak power supplied to the heater circuit even when the primary power supply voltage fluctuates. It is a thing.

[0006]

A heater circuit according to a first embodiment of the present invention includes a plurality of peak power adjusting heaters connected in series to the heater and one peak power adjusting heater in parallel. By providing a plurality of connected peak power adjustment switch elements and turning on / off the peak power adjustment switch elements, the power consumption of the heater circuit can be adjusted, and at the same time, the input voltage detection circuit and this peak power adjustment are provided. Switch element on / o
An ff control circuit is provided.

The heater circuit according to the second embodiment of the present invention is
A plurality of peak power adjusting heaters connected in parallel to the heater and a plurality of peak power adjusting switch elements connected in series to each of the peak power adjusting heaters are provided. Element on /
The power consumption of the heater circuit can be adjusted by turning it off, and at the same time, an input voltage detection circuit and an on / off control circuit for the peak power adjustment switch element are provided.

A heater circuit according to a third embodiment of the present invention is
A plurality of switch elements connected in parallel to the input terminal and a plurality of heaters connected in series to each switch element are provided, and at the same time, a temperature sensor, an input voltage detection circuit, and an on / off control circuit are provided. The peak power is adjusted by controlling the on / off of a plurality of switch elements according to the detected temperature and the input voltage.

The heater circuit according to the fourth embodiment of the present invention is
A plurality of heaters connected in series to the input terminals, the same number of switch elements as the heaters connected to all of the heater connection points and one end of the heater, and a temperature sensor and an input voltage detection circuit are provided. An on / off control circuit is provided to control the on / off of a plurality of switch elements according to the detected temperature and the input voltage to adjust the peak power.

[0010]

In the heater circuit according to the first embodiment of the present invention, the peak power adjusting switch element is turned off when the input voltage is high, so that the maximum peak power supplied when the temperature adjusting switch element is conductive. The value can be reduced.

The heater circuit according to the second embodiment of the present invention is
By turning off the peak power adjustment switch element when the input voltage is high, it is possible to reduce the maximum value of the peak power that is supplied when the temperature adjustment switch element is in the conductive state. Since the electric power is supplied to the heater and the power consumption per heater can be suppressed, the reliability is improved.

The heater circuit according to the third embodiment of the present invention is
Switch element that becomes conductive when the detected temperature is low,
By determining that the resistance value of the heater circuit increases as the input voltage increases, the maximum value of the peak power supplied when the switch element is in the conductive state can be reduced, and the temperature control switch element By eliminating the distinction between the peak power adjusting switch elements, it is possible to finely adjust the peak power.

The heater circuit according to the fourth embodiment of the present invention is
Switch element that becomes conductive when the detected temperature is low,
By selecting such that the resistance value of the heater circuit increases as the input voltage increases, the maximum value of the peak power supplied when the switch element is in the conductive state can be reduced.

[0014]

【Example】

Example 1. 1 is a block diagram of a heater circuit according to a first embodiment of the present invention, in which 1 is an input terminal and 2
Is a temperature adjustment switch element, 3 is a heater, 4a to 4n are peak power adjustment switches, 5a to 5n are peak power adjustment heaters, 6 is a temperature sensor, 7 is an input voltage detection circuit,
Reference numeral 8 is an on / off control circuit for adjusting peak power, 9 is an on / off control circuit for adjusting temperature, and 10 is a heater section.

Next, the operation will be described. The on / off control circuit 9 turns on / off the temperature adjustment switch element 2 based on a signal from the temperature sensor 6 that detects the temperature of the heater section 10.
/ Off control is performed to keep the temperature of the heater unit 10 at a certain threshold level. At the same time, the peak power adjusting switch elements 4a to 4n and the peak power adjusting on / off control circuit 8 and the input voltage detecting circuit 7 for performing on / off control of the peak power adjusting switch elements 4a to 4n are used to adjust the temperature. The maximum value of the peak power when the switch element 2 for conduction is in the conductive state is reduced. The peak power adjustment on / off control circuit 8 detects the input voltage by the input voltage detection circuit 7, and when the input voltage is in a steady state, all the peak power adjustment switch elements 3 and 4 are made conductive to adjust the temperature. When the switch element 2 is in the conductive state, the current is supplied only to the heater 3. The on / off control circuit 8 is
When the input voltage increases, some of the peak power adjusting switch elements 4a to 4n are turned off, and current is supplied to some of the peak power adjusting heaters 5a to 5b. , The combined resistance value of the circuit is increased, and when the input voltage is maximum, all the peak power adjusting switch elements 4a to 4n are cut off,
A current is supplied to all of the peak power adjusting heaters 5a to 5n to maximize the combined resistance value of the circuit, thereby suppressing an increase in peak power.

Example 2. 2 is a block diagram of a heater circuit according to a second embodiment of the present invention.
3, 6 to 10 are the same as those in FIG. 1, and 11a to 11n
Is a peak power adjustment switch, and 12a to 12n are peak power adjustment heaters.

According to the same principle as that of the embodiment shown in FIG. 1, the heater circuit maintains the temperature of the heater section 10 at a certain threshold level, and at the same time, the peak power adjusting switch elements 11a to 11n and the peak power adjusting switch. An on / off control circuit 8 for peak power adjustment for performing on / off control of the elements 11a to 11n and an input voltage detection circuit 7
Thus, the maximum value of the peak power when the temperature control switch element 2 is in the conductive state is reduced. On for peak power adjustment
The / off control circuit 8 detects the input voltage by the input voltage detection circuit 7, and when the input voltage is in a steady state, all the peak power adjusting switch elements 11a to 11n are turned on, and the temperature adjusting switch element 2 is turned on. In the state, current is supplied to the heater 3 and all the peak power adjusting heaters 12a to 12n. The peak power adjusting on / off control circuit 8 turns off some of the peak power adjusting switch elements 11a to 11n when the input voltage becomes high, and turns off some of the peak power adjusting heaters 12a to 12b. No electric current is supplied to the peak power adjusting heater, the combined resistance value of the circuit is increased, and when the input voltage is maximum, all the peak power adjusting switch elements 11a to 11n are turned off, and all the peak power adjusting switch elements are turned off. An electric current is not supplied to the power adjustment heaters 12a to 12n, and the combined resistance value of the circuit is maximized to suppress an increase in peak power. In this heater circuit, power is supplied to all the heaters in the steady state, and the power consumption per heater can be suppressed, so that the reliability is improved.

Example 3. 3 is a block diagram of a heater circuit according to a third embodiment of the present invention.
Reference numerals 7 and 10 are the same as those in FIG. 2, 13a to 13n are switch elements, 14a to 14n are heaters, and 15 is on / o.
ff control circuit.

The heater circuit detects the temperature of the heater section 10 by the temperature sensor 6 and the input voltage by the input voltage detection circuit 7, and the on / off control circuit 15 switches the switch elements 13a to 13n when the detected temperature is high. Is turned off, and when the detected temperature is low, some or all of the switch elements 13a to 13n are turned on according to the input voltage to keep the temperature of the heater unit 10 at a certain threshold level. , Suppress the rise of peak power. When the input voltage is in a steady state, all the switch elements 13a to 13n are turned on when the detected temperature is low, and when the input voltage becomes high, the increase of the peak power becomes small. Thirteen
One or a plurality of switch elements that are brought into a conductive state when the detected temperature is low are selected from n, and when the input voltage is maximum, the switch elements 13a to 13a are selected when the detected temperature is low.
Among n, the maximum value of peak power can be made small by making only the switch element connected to the heater having the maximum resistance value among the heaters 14a to 14n conductive.

In this circuit, reliability is improved for the same reason as in the second embodiment, and at the same time, when the number of switch elements and heaters is the same, the circuit at the time of heat generation is higher than in the first and second embodiments. Since a large number of types of combined resistance values can be set, the peak power can be adjusted more finely.

Example 4. 4 is a block diagram of a heater circuit according to a fourth embodiment of the present invention.
Reference numerals 7, 10 and 15 are the same as those in FIG.
Are switch elements, and 17a to 17n are heaters.

The heater circuit detects the temperature of the heater section 10 by the temperature sensor 6 and the input voltage by the input voltage detection circuit 7, and the on / off control circuit 15 switches elements 16a to 16n when the detected temperature is high. Is cut off, and when the detected temperature is low, one of the switch elements 16a to 16n is made conductive in accordance with the input voltage, thereby keeping the temperature of the heater unit 10 at a certain threshold level and at the peak. Suppress the rise in power.

When the input voltage is in a steady state, when the detected temperature is low, the switch element 16a is turned on so that the current is supplied only to the heater 17a, and when the input voltage is high, the increase of the peak power is small. As described above, one switch element is selected from the switch elements 16a to 16n to be brought into a conductive state when the detected temperature is low according to the input voltage. When the input voltage is maximum, the switch element is selected when the detected temperature is low. Only the heater 16a is made conductive with only 16n.
By supplying current to all 17n,
The maximum value of peak power can be reduced.

[0024]

Since the present invention is constructed as described above, it has the following effects.

According to the first embodiment of the present invention, the maximum value of the peak power can be reduced by adjusting the electric resistance value of the circuit according to the input voltage.

According to the second embodiment of the present invention, in addition to the effect of the first embodiment, electric power is supplied to all the heaters in the steady state, and the power consumption per heater can be suppressed, so that reliability is improved. improves.

According to the third embodiment of the present invention, in addition to the effect of the second embodiment, by eliminating the distinction between the temperature adjusting switch element and the peak power adjusting switch element, the combined resistance value of the circuit during heat generation can be improved. Since many types can be set, the peak power can be adjusted more finely.

According to the fourth embodiment of the present invention, the maximum value of the peak power can be reduced similarly to the first embodiment.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a heater circuit according to the present invention.

FIG. 2 is a diagram showing a second embodiment of a heater circuit according to the present invention.

FIG. 3 is a diagram showing a third embodiment of the heater circuit according to the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the heater circuit according to the present invention.

FIG. 5 is a diagram showing an example of a conventional heater circuit.

FIG. 6 is a diagram showing an operating state of a conventional heater circuit.

[Explanation of symbols]

1 input terminal, 2 temperature control switch element, 3 heater, 4a first peak power control switch element, 4n
Nth peak power adjustment switch element, 5a First peak power adjustment heater, 5n Nth peak power adjustment heater, 6 Temperature sensor, 7 Input voltage detection circuit, 8 Peak power adjustment on / off control circuit, 9 temperature control on / off control circuit, 10 heater section, 11a first peak power control switch element, 11n Nth peak power control switch element, 12a first peak power control heater, 12n Nth switch Peak power adjusting heater, 13a first switch element, 13b second switch element, 13n Nth switch element, 14a first heater, 14b second heater, 14n Nth heater, 15 on / off control Circuit, 16a 1st switch element, 16b 2nd switch element, 16n Nth switch element, 17a 1st heater, 17b 2nd Heater, 17n heater of the N.

Claims (4)

[Claims] 1. An input terminal to which a primary power source is input, and an on terminal for supplying power from the primary power source, which is connected to the input terminal.
/ Off, a heater connected in series to the switch element, a temperature sensor for detecting the temperature of the heater, and a first on / off switch for turning on / off the switch based on a signal from the temperature sensor. In a heater circuit including an on / off control circuit, a plurality of power adjustment heaters connected in series to the heater, and N power adjustments connected in parallel to the plurality of power adjustment heaters, respectively. A switching element for power supply, and an input voltage detection circuit for detecting a primary power supply voltage applied to the input terminal, and a signal from the input voltage detection circuit for turning on / off the plurality of power adjustment switching elements. A heater circuit provided with a second on / off control circuit. 2. An input terminal to which a primary power source is input, and an on terminal for supplying power from the primary power source, which is connected to the input terminal.
A switch element for performing on / off, a heater connected in series to the switch element, a temperature sensor for detecting the temperature of the heater, and a first for performing on / off of the switch element based on a signal from the temperature sensor. In a heater circuit including an on / off control circuit, a plurality of power adjustment heaters connected in parallel to the heater and a plurality of powers connected in series to the plurality of power adjustment heaters, respectively. An adjustment switch element is provided, and an input voltage detection circuit that detects a primary power supply voltage applied to the input terminal, and a signal from the input voltage detection circuit, turn on / off the plurality of power adjustment switch elements. A heater circuit provided with a second on / off control circuit for performing. 3. An input terminal to which a primary power source is input, and a plurality of switch elements connected in parallel to the input terminal,
A plurality of heaters, one each connected in series to the plurality of switch elements, a temperature sensor for detecting the temperature of the heater, and an input voltage detection circuit for detecting a primary power supply voltage applied to the input terminal. And a heater circuit including an on / off control circuit that turns on / off the plurality of switch elements according to a signal from the temperature sensor and a signal from the input voltage detection circuit. 4. An input terminal to which a primary power source is input, a plurality of heaters connected in series to the input terminal, all the connecting points of the heaters to the plurality of heaters, and the final end of the heater. N switch elements connected one by one and having the other end connected to the return of the primary power source, a temperature sensor, an input voltage detection circuit for detecting a primary power source voltage applied to the input terminal, and ON / OFF for turning on / off the plurality of switch elements by a signal from a temperature sensor and a signal from the input voltage detection circuit.
A heater circuit including an f control circuit.