JP3191347B2 - Bus voltage controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus voltage control device used for a power supply of a spacecraft such as an artificial satellite.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, this type of bus voltage control device is supplied to a solar cell array 1 mounted on a spacecraft, a load 2 such as mounted equipment, and a load 2. A voltage controller 3 for detecting the surplus power of the solar cell array 1 from the voltage, and a shunt circuit 4 having a transistor control function for shunting the surplus power under the control of the voltage controller 3
And a floating type battery 22 for storing the power of the solar cell array 1. Here, the bus voltage is controlled by the shunt circuit 4 to control the power generated by the solar cell, and the upper limit value of the bus voltage is controlled to a preset single voltage.

[0003]

In the conventional bus voltage control device described above, the upper limit value of the bus voltage is always fixed to a single value, so that various mounted devices use the same bus voltage. Become. Since the voltage value is determined by the mounting device using the component having the minimum withstand voltage, when mounting a device that consumes large power, the device can withstand a high input voltage, and, Even with a constant power consumption type, a low bus voltage must be used, and there is a disadvantage that a high-output solar cell array is required.

[0004]

SUMMARY OF THE INVENTION A bus voltage control device according to the present invention is a voltage detecting device for detecting surplus power of a solar cell array from a voltage value of a bus line for supplying generated power of a solar cell array to a load of a device mounted on a satellite. a controller, the bus voltage controller having a shunt circuit for shunting the generator power by control of the voltage controller, said bus to said load
Supply a high bus voltage higher than the steady bus voltage of the line
A shunt resistor of the bus voltage regulating said connected in parallel with the load in order, the high-high efficiency the solar cell array
Wherein possess a switch for turning off the shunt circuit for use in the bus voltage, the summer solstice the shunt resistor power Oyo
Early Equinox Mission Life and Summer Solstice Mission Life
Switching at least three types of shunt resistors between the end
To have a Ete function to be used. The bus voltage control of the present invention
The control device uses the power generated by the solar cell array
From the voltage value of the bus line supplied to the load
A voltage controller that detects the surplus power of the array and this voltage controller
A shunt circuit that shunts the generated power under the control of a controller
And a battery for storing the power generated by the solar cell array.
A bus voltage control device comprising:
Bus voltage load using the
High using Sline steady bus voltage / high bus voltage
A load separating switch for separating a bus voltage load,
For adjusting the bus voltage connected in parallel with the high bus voltage load
Using a shunt resistor and the solar cell array with high efficiency
A switch for turning off the shunt circuit,
Supplying discharge power of a battery to the steady-state bus voltage load
And a battery changeover switch.

[0005]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. The bus voltage control device of this embodiment has two functions roughly classified. First, as a conventional bus voltage control function, a solar cell array 1 for converting light energy into electric energy
The voltage controller 3 supplies the output power of the solar cell array 1 to the load 2 of the on-board equipment as a load at a stable voltage.
A surplus state of the output is detected, and a signal corresponding to the surplus state is sent to the shunt circuit 4, and the shunt circuit 4 stabilizes a bus line voltage which is power consumed by the surplus of the solar cell array and supplied to the on-board equipment. . At this time, the shunt circuit 4 is connected to the bus line 5 by a switch 6 for connection and disconnection. Next, another function of supplying power at a higher voltage than a voltage controlled by a shunt circuit called a steady bus voltage in order to use the output of the solar cell array 1 with high efficiency will be described. First, one or a plurality of bus voltage adjusting resistors 7 are provided in parallel with the load 2 of the mounted device serving as the load of the solar cell array 1. When it is desired to supply a voltage higher than the steady bus voltage to the load 2, an adjusting resistor 7 corresponding to the output of the solar cell array 1 is selected and connected to the load 2 in parallel. The output of the solar cell changes due to the seasonal change of the year and the secular change due to radiation exposure and the like. FIG. 5 shows an example of the relationship between the output characteristics of the solar cell array and the load. In FIG. 5, 8 is an array output characteristic at the summer solstice at the beginning of the mission life (BOL), 9 is an array output characteristic at the vernal equinox of the BOL, 10 is an output characteristic at the summer solstice at the end of the mission life (EOL), and 11 and 12 are for adjustment. 13 is a curve of the power consumption characteristic of the load 2,
4 is a power consumption curve obtained by adding 13 and 11, and 15 is 13
12 is a power consumption curve obtained by adding 1 and 12. 16 indicates the position of the steady bus voltage, and 17 indicates the high bus voltage line. a, b, and c are the intersections of the array output characteristics of 8, 9, and 10 and the steady bus voltage 16. First, in the steady state, even if the array output characteristic or the load changes as in the case of 8 to 10, the shunt circuit 4 sets 16 steady-state bus voltages, and supplies power to the equipment mounted on the load 2 at a stable voltage. . The supplied power at this time is a value obtained by multiplying the X-axis current values a, b, and c by the Y-axis voltage value. Next, in order to set the high bus voltage 17 for the purpose of using the output of the solar cell array with high efficiency (to increase the supply power), the power consumption 13 of the mounted device and the power consumption 11 and 12 by the adjustment resistor 7 are reduced. The load of the combination solar cell array 1 is used. In the example of FIG. 5, the combination of the load power 13 and the adjusting resistor 12 is used for the summer solstice of the BOL, the combination of 13 and 11 is used for the spring equinox of the BOL, and the EOL is used.
At the summer solstice there will be only 13. The power supply at this time is d,
It becomes a value obtained by multiplying the X-axis current value of e and f by the Y-axis voltage value, and the supplied power is larger than in the case where the stationary bus voltage 16 is used. Since the output of the solar cell array 1 changes every moment, the point of the high bus voltage 17 is not constant but moves on the array output characteristic, and the voltage becomes the intersection of the current array output characteristic and the power consumption curve of the combined load.
FIGS. 2 and 3 show an application example of the embodiment of FIG. 1 in which there are a plurality of on-board devices which are loads, a load 18 uses a steady bus voltage, and a load 19 is a solar battery at one time or all times during a mission life. The case where a high bus voltage is used for the purpose of using the array output with high efficiency will be described. FIG. 2 shows a case in which the switch 20 is turned off and the array output is temporarily supplied to the load 19 at a high bus voltage by turning off the switch 20. Supplies the discharge power of the battery 22. 3 (a) and 3 (b) show the load 18 and the load 19 completely separated, respectively. A steady bus voltage stabilized by the shunt circuit 4 is supplied to the load 18 shown in FIG. 3 (a). . To the load 19 shown in FIG. 3B, the switch 21 is operated as necessary to supply power at a steady bus voltage or a high bus voltage. FIG. 6 shows the power that can be supplied to the solar cell array when a constant and stable bus voltage is used at all times and when the bus is used on a high bus. If the bus voltage is fixed at CV, B
In order to obtain W power, the voltage-current (VI) characteristic 2
3. A solar cell array having a voltage-power (VP) characteristic 25 is required, but when an array output is used with high efficiency, a VI characteristic 22 and a VP characteristic are required to obtain a BW output. A solar cell array having 23 is good. In the former case, the power between B and A is consumed by the shunt circuit as surplus power.

[0006]

As described above, the present invention provides a stable bus voltage by providing a switch for turning on / off the bus voltage control function by the conventional shunt circuit and one or more resistors for adjusting the bus voltage. There is an effect that the mode and the high bus voltage mode for the purpose of using the output of the solar cell array with high efficiency can be appropriately used.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram illustrating an application example of the embodiment.

FIG. 3 is a block diagram showing another application example of the embodiment.

FIG. 4 is a block diagram of a conventional bus voltage control device.

FIG. 5 is a characteristic diagram illustrating the present embodiment.

FIG. 6 is an explanatory diagram of power supply for explaining the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 solar cell array 2 load 3 voltage controller 4 shunt circuit 5 bus line 6, 20, 21 switch 7 adjustment resistor 8 array output characteristic at BOL summer solstice 9 array output characteristic at BOL vernal equinox 10 array output characteristic at EOL summer solstice 11, 12 Power consumption of resistor 7 13 Load power consumption curve 14, 15 Power consumption curve added 16 Regular bus voltage line 17 High bus voltage line 18, 19 Load 22 Battery

Claims (2)

(57) [Claims] A voltage controller that detects surplus power of the solar cell array from a voltage value of a bus line that supplies power generated by the solar cell array to a load of an onboard satellite device, and that the voltage controller controls the surplus power. in bus voltage controller having a shunt circuit for shunting the generated power, the negative
High bus voltage higher than the steady bus voltage of the bus line
A shunt resistor for adjusting a bus voltage connected in parallel with the load to supply a voltage, and a high efficiency of the solar cell array.
Wherein possess a switch for turning off the shunt circuit for use in Haibasu voltage, the shunt resistor power
Early summer solstice and equinox mission life
At least three types of shunt resistance at the end of the service life
Bus voltage control device, characterized in that have a function to use switched vessel. 2. The power generated by the solar cell array is transmitted to a satellite
From the voltage value of the bus line supplied to the load of the
A voltage controller for detecting the surplus power of the solar cell array;
A shunt for dividing the generated power under the control of a voltage controller.
And a power supply circuit for storing power generated by the solar cell array.
A bus voltage control device comprising a battery;
A steady bus voltage load that uses the steady bus voltage
The steady bus voltage / high bus voltage of the bus line is used.
Switch for separating high bus voltage load
And a bus voltage connected in parallel with the high bus voltage load
A shunt resistor for adjustment and the solar cell array with high efficiency
A switch that turns off the shunt circuit for use
And the discharging power of the battery to the steady-state bus voltage load.
A battery changeover switch for supplying
A bus voltage control device, characterized in that: