JPH03114166A - Heater control device - 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] [Object of the Invention] (Industrial Application Field) The present invention is used, for example, to control a thermal control heater of an artificial satellite equipped with an unregistered power source that has relatively limited power generation. The present invention relates to a heater control device that performs well-balanced thermal control in terms of both electric power and heat.

(Conventional technology) In conventional satellites, the generated power is relatively stable;
Since the power supply regulation has a small fluctuation range between sunshine and other times, all heaters are controlled simultaneously for the entire satellite. On the other hand, artificial satellites are becoming larger, and the increase in the amount of electricity used is forcing power sources to become larger and heavier. For this reason, an enregion power source is used to reduce the weight of the satellite, but in order to ensure a unique heat capacity, a large-capacity heater must be used for thermal control. Therefore, heaters for thermal control used in artificial satellites are required to perform thermal control with a good balance between electric power and thermal power.

(Problems to be Solved by the Invention) As described above, in conventional heater control devices, if an unregid type power source is used, which has a relatively limited amount of generated power, It is required to perform well-balanced thermal control.

This invention was made in order to solve the above-mentioned problems, and provides a heater control device that can perform thermal control using an unregid power source in a well-balanced state in both electric power and thermal power. The purpose is to

[Configuration of the Invention (Means for Solving the Problems) To achieve the above object, a heater control device according to the present invention includes a plurality of heater circuits configured by grouping a plurality of heaters, and each heater circuit. It detects the temperature within the temperature control area of the heater that constitutes each heater circuit, compares the detected value with a reference value, and if the detected value does not reach the reference value, the corresponding heater circuit is Connect to power,
A plurality of temperature control means control the temperature of the temperature control region by disconnecting the heater circuit from the power supply when the temperature exceeds a reference value, and a plurality of temperature control means are set to be switched to an operating state in order in a time-sharing manner. and a power control means for limiting the power supply state of the heater circuit.

Specifically, the power control means is characterized in that it sequentially switches and sets each reference value of the plurality of temperature control means to a ground level. Furthermore, when there are two systems of the plurality of heater circuits and the plurality of temperature control means, one pulse signal is divided into two, one is supplied as is, the other is inverted and supplied to each temperature control means, and the operating state is alternately changed. It is characterized in that it is made to be.

(Function) In the heater control device having the above configuration, each heater circuit is controlled to the optimum temperature by the corresponding temperature control means, and the heater circuits are alternately switched to the power supply state in a time-sharing manner by the power control means. Temperature control and power control can be performed at the same time in a well-balanced manner, and even if an unregistered power source with a relatively limited amount of power generation is used as a power source, it can be used satisfactorily.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows its configuration, and 11.1□ is a heater circuit. Each of the heater circuits 10, 1□ includes one or more heaters, and in the case of a plurality of heaters, each heater is connected in parallel. Each heater circuit 14,1
Temperature control circuits 21 and 22 are provided for □, respectively. Each temperature control circuit 21, 2□ is a temperature detection circuit 2 +
1+ 221, base 41 voltage generation circuit 2 +2+ 2
22, Comparator 2I3゜221, Switch circuit 2
Consists of +4+224.

Each temperature detection circuit 2z, 2□ includes a thermistor S I In 821 for temperature detection and a resistor R, , R2,
are connected in series, and both ends thereof are connected to a 10B power supply, and a detection voltage vD1. This is for taking out VD2.

Each thermistor S I In s21 has a resistance value that changes depending on the temperature (here, it is assumed that the resistance value decreases as the temperature rises).The corresponding heater circuit 1□, 1
It is installed within the temperature controlled area of 2. That is, the detection voltage VDI+VO2 changes in accordance with the temperature change within the temperature control region of the heater circuit 1°1□. This detection voltage v
Dlr v D2 is each comparator 2+3.2
□, is supplied to the (-) input terminal of. The reference voltage generation circuit 2 +2+ 222 has resistors R22 and R, respectively.
, R2□ and R2, divides the 10B power supply voltage to generate reference voltages vRI, VR□, and these reference voltages V R, , V R2 are connected to comparators 2+3.2□, is supplied to the (+) input terminal of.

Each comparator 2, 2□3 sets its output to high level when the detected voltage v Dl+ v D2 from the (-) input terminal does not reach the reference voltage VR1+ VH2 from the (+) input terminal, and sets the output to the reference voltage V RI+ When the voltage exceeds VR2, it becomes low level, and each output is supplied to a switch circuit 2+4+ 224, respectively.

Each switch circuit 2.4.2□4 is a bias circuit formed by resistors R34 and R, , R2, and R2, respectively, and a switching transistor Q1□, Q2. When the output of comparator 2 + 3 + 223 is at high level, transistors Q1□, Q2 . Turn on heater circuit 1□,
Connect 1□ to the bus power supply, and when it is low level, QII+
Q 2+ is turned off and heater circuit 1. ．． 1□ is disconnected from the bus power supply.

The above temperature control circuit 2 + + 22 is the power control circuit 3
Its operating state is controlled by The power control circuit 3 transmits the pulse signal generated by the pulse generator 3□ to the distributor 3□
The pulse signal is divided into two by the temperature control circuit 2. After the other pulse signal is inverted by an inverting circuit 33, it is supplied to the base of a switching transistor Q22 provided in the heater power supply circuit 2□. . Each switching transistor QI2. Q2□ is turned on when the base input is at high level, and comparator 21.
.

The (+) input terminal of 2□ is short-circuited.

The operation of the above configuration will be explained below.

First, temperature control circuit 2. In, transistor QI2
is in the off state, the temperature detection voltage VD+ output from the temperature detection circuit 2.1 changes depending on the surrounding temperature due to a change in the resistance value of the thermistor Sl+ installed in the temperature control area of the heater circuit 11. Change. Therefore, this detected voltage VDI is compared with the reference voltage VRI from the reference voltage generation circuit 212 by the comparator 2+3. Here, V
If Dl<VH1, a high level signal is output from the comparator 213, the transistor Q++ of the switch circuit 2□4 is turned on, and the heater circuit 1. bus power is connected to. Therefore, the heater enters a heating state and the temperature within the temperature control area increases.

After that, if VDI≧VR□, comparator 20.
A low level signal is output from switch circuit 2+4.
(The DI' transistor Q 11 is turned off, and the bus power is disconnected from the heater circuit 1. Therefore, heater heating is interrupted and the temperature in the temperature control area decreases. In other words, the reference voltage generation circuit If the resistors R1□ and R13 are selected so that the reference voltage VR outputted from 21□ matches VD at the optimum temperature, the temperature control region of the heater circuit 1 can be maintained at the optimum temperature. .

Similarly, in temperature control circuit 2□, transistor Q2
When □ is in the off state, the temperature detection voltage VD2 output from the temperature detection circuit 2□1 is applied to the comparator 23. It is compared with the reference voltage VR2 from the reference voltage generation circuit 2□2, and if V D2<V 112, the comparator 2□
3. A bus power source is connected to the heater circuit 12 through the switch circuit 2□4, and the heater enters a heating state, causing the temperature in the temperature control area to rise. After that, ■D2≧VR
2, the bus power supply is disconnected from the heater circuit 12, heater heating is interrupted, and the temperature within the temperature control area drops. In other words, if the resistors R22 and R23 are selected so that the reference voltage VR2 output from the reference voltage generation circuit 2□2 matches VD2 at the optimum temperature, the temperature control region of the heater circuit 1□ can be maintained at the optimum temperature. can do.

In contrast to the temperature control circuit 21.2□ above, the power control circuit 3
, the pulse signal generated by the pulse generator 31 is divided into two by the distributor 3□, one of which is supplied to the base of the switching transistor Q12 provided in the temperature control circuit 21, and the other pulse signal is supplied to the inverting circuit 3. After being inverted at , it is supplied to the base of a switching transistor Q22 provided in the heater power supply circuit 22. Therefore, the switching transistors Q121022 are alternately turned on, short-circuiting the (+) input terminal of the comparator 213+2□3, and supplying the reference voltage V to the (+) input terminal.
Let R1+VR□ be the ground level. In this way VR
If □+”R□ becomes the ground level, thermistor S l
No matter what the resistance value of the transistor Q22. Q2□ is always off and no power is supplied to heater circuits 11 and 12.

Therefore, in the heater control device having the above configuration, the heater circuits II and 1□ are connected to the corresponding temperature control circuit 21.
．． Since the heater circuits 11 and 12 are connected to the bus power supply alternately in a time-sharing manner by the power control circuit 3 while controlling the temperature to the optimum temperature using the power control circuit 22, temperature control and power control can be performed at the same time in a well-balanced manner. Even if an unregistered power supply with a limited amount of electric power generation is used, it can be sufficiently handled.

In the above embodiment, the (+) of the comparator 2□3゜2□3 of each temperature control circuit 2I, 2□ serves as the power control means.
Although the input end is short-circuited to interrupt the power supply, the present invention is not limited to this, and for example, comparator 2+3+
Of course, the operation of 223 itself may be stopped or the transistors QI4IQ24 may be directly turned off. In addition, even if there are not only two systems but three or more heater circuits, a temperature control circuit is provided for each,
If each temperature control circuit is controlled to operate in sequence in a time-sharing manner,
The same can be done.

[Effects of the Invention] As described above, the present invention provides a heater control device that can perform thermal control using an unregid power source in a well-balanced state in terms of both electric power and heat. be able to.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing an embodiment of a heater power supply control device according to the present invention. II, 12... Heater circuit, 212□... Temperature control circuit, 2++, 2□1... Temperature detection circuit, 2.2゜2
□2... Reference voltage generation circuit, 213+2□,... Comparator, 2 +4+ 224"' switch circuit, VD,. VD2... Detection voltage, VR,, VR2... Reference voltage, 3... Power control circuit, 3. Pulse generator, 3
2...Distributor, 33...Inverting circuit.

Claims (3)

[Claims] (1) A plurality of heater circuits are formed by grouping a plurality of heaters, and each heater circuit is provided to detect the temperature within the temperature control area of the heater that constitutes each heater circuit, and to record the detected value. Compare the detected value with the standard value, and if the detected value does not reach the standard value, connect the corresponding heater circuit to the power supply.
a plurality of temperature control means for controlling the temperature in the temperature control region by disconnecting the heater circuit from the power supply when the temperature exceeds a reference value; A heater control device comprising: power control means for limiting the power supply state of a heater circuit. (2) The heater control device according to claim 1, wherein the power control means sequentially switches and sets each reference value of the plurality of temperature control means to a ground level. (3) When there are two systems of the plurality of heater circuits and the plurality of temperature control means, the power control means distributes one pulse signal into two, and one pulse signal is sent as is and the other is inverted to each temperature control means. 2. The heater control device according to claim 1, wherein the heater control device is configured to alternately supply and put the heater into an operating state.