JPH02105213A - Power control circuit - Google Patents

Abstract

PURPOSE:To eliminate noise due to the change of a current and power consumption by power switching by selecting an operating voltage and an operating frequency based on whether the level of ambient temperature is high or low and increasing or decreasing the processing speed of a computer. CONSTITUTION:A computer system 1 is always monitored by a temperature monitor 5, and the monitor 5 outputs an analog voltage proportional to a temperature to a voltage adjusting circuit 9 as temperature data 8. The circuit 9 outputs the operating voltage vS complying with an inversely proportional graph corresponding to the data to the system 1 and an A/D conversion circuit 10, and outputs the operating frequency fs corresponding to the operating voltage vS to the system 1. Thereby, the voltage vS is decreased when the data 8 is increased, and the frequency fs is decreased when the voltage vS is decreased. Therefore, since the power consumption of a CMOS circuit is decreased in proportion to fsXvS<2>, which decreases the temperature of the system 1 as a result. Adversely, temperature allowance is generated when the data 8 is decreased, which increases the voltage vS and the frequency fs, and processing capacity can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applied to a computer system using CMOS parts used in an environment where the circumferential basis changes greatly, such as an artificial satellite in outer space. .

The present invention relates to a power control circuit that effectively controls generated power according to changes in ambient temperature.

[Conventional technology]

Conventionally, there has been a power switching method shown in FIG. 6 as a method for controlling the power generated by one circuit.

o+#Li computer system, (2) is a power switching circuit, and (3) is a strobe signal that turns on and off the power switching circuit (2). This strobe signal (
Power switching circuit (2) K only when 3) occurs
Therefore, power is supplied to the computer system (1).

(4) power switching prohibition gate), (51 is a temperature monitor, and (6) is a switching enable signal.

Next, let's talk about the movement. The temperature of the computer system (1) is monitored by a temperature monitor (5).

If the temperature is within the set range, the switching enable signal (6) holds the L level.

Power switching circuit (21 to computer system (1)
) is continuously supplied with power.

If the temperature exceeds the set value, the switching enable signal (6) will not go to H level and the strobe signal (3
), the power switching inhibition gate (4) is controlled on and off, and power is supplied from the power switching circuit (2) to the computer system (1) in a switching state. From this K, the generated power is averaged to 0
It is possible to suppress the rise in circuit temperature to a low level.

[Problem to be solved by the invention]

Conventional power switching systems were configured as 9 or more, so when turning on and off the power supply, the current changes were large, causing noise, and the power loss of the power switching circuit (2) itself. There were issues such as the large amount of

This invention was made to solve the above-mentioned problems, and it is a method for turning on and off the power supply.
By adopting a method of changing the operating frequency and operating voltage supplied to the S circuit, the power switching circuit (
2) to eliminate noise caused by current changes and power loss in the power switching circuit (2) itself.

[Means for solving Vs-] The power control circuit according to the present invention measures the circuit temperature by disposing a temperature monitor in the circuit of a computer system composed of CMOS circuits, and uses the measured value of the temperature to determine the DC/ The reference output voltage output from the DC converter is proportionally controlled by a voltage adjustment circuit to become the operating voltage of the computer, and this operating voltage is digitized by an A/D conversion circuit and output from the reference clock generation circuit. The reference frequency is changed in proportion to the digital value to become the operating frequency of the computer, depending on the circuit temperature.

While controlling the operating voltage and operating frequency of the calculator.

This is to keep the circuit temperature within an allowable range.

[Effect]

When the temperature of the computer system is low, the power control circuit in this invention selects a high operating frequency and a high operating voltage to increase processing speed; Select to reduce the processing speed. With this, 0M
Adjust the power generated by O8 = (load capacity) x (operating frequency) x (operating voltage) 2.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1) is the computer system, (5) is the temperature monitor of the computer system (1), and (7) is the D C/D.
C converter, VB is reference output voltage, (8) is temperature data.

(9) is a voltage adjustment circuit that controls the reference output voltage VB using the temperature data (8), VB is the operating voltage, and a. is an A/D conversion circuit that converts the operating voltage VS into a digital value.
dll base clock generation circuit, fB base frequency, 0
h is the clock control circuit, and fs is the operating frequency.

+13 holds the digital value output from the A/D converter circuit α every time at the rising edge of the operating frequency fs.

This is a frequency dividing circuit that changes the cycle of the operating frequency fs while decrementing this value.

FIG. 2 shows how the operating voltage vs changes in inverse proportion to the change in temperature data (8). In this case, 0MO8 was in the range of +5v to +15V.

FIG. 3 shows the operating frequency f corresponding to the change in the operating voltage VS.
It shows how s changes, and the computer system (
The maximum frequency in 1) is the fundamental frequency fB. When the computer system (1) is at an average temperature, the computer is operated within the range of operating frequency fs shown in FIG. In the figure, the operating frequency f3 is shown in a stepwise manner because the fundamental frequency fB is divided by the frequency dividing circuit a3.

FIG. 4 shows the relationship between the fundamental frequency fB, temperature data (8), and operating frequency fs by the frequency dividing circuit α3. The figure shows that the resolution of the operating frequency fs corresponds to one clock of the fundamental frequency fB.

FIG. 5 is an example showing how the operating frequency fs changes continuously in response to changes in the warming data (8). Note that the dot in FIG. 9 indicates the rising edge of the operating frequency fs, indicating that the digital output value from the A/D conversion circuit ON is held in the frequency dividing circuit 01 at this point.

Next, the operation will be explained.

The computer system 10 is constantly monitored by a temperature monitor (5). The temperature monitor (5) uses an analog voltage proportional to the temperature as temperature data (8) to control the voltage adjustment circuit (
9). The voltage adjustment circuit (9) receives temperature data (
Corresponding to 8), the operating voltage VS along the inverse proportionality graph shown in the second factor is output to the computer system (!) and the A/D conversion circuit aα. The A/D conversion circuit α1 outputs an operating frequency fs corresponding to the operating voltage vsK shown in FIG. 3 to the computer system (1).

As a result, when the m degree data (8) becomes high.

The operating voltage vs becomes lower, and when the operating voltage Vs becomes lower, the operating frequency fs becomes lower. This is from K.

The power consumption of the 0M08 circuit decreases in proportion to fsxvs2, and as a result, it works to lower the temperature of the computer system. Conversely, when the temperature data (8) becomes low, a temperature margin occurs. Therefore, the operating voltage v
s and the operating frequency f5 to improve the processing capacity.

In addition, in the above embodiment, a method of controlling the temperature of the computer system while controlling the measurement data of the temperature monitor using hardware such as a voltage adjustment circuit was shown. Alternatively, the operating voltage and operating frequency may be controlled by a program.

Further, in the embodiment, only the application to a computer system is shown, but the same effect can be obtained even if the invention is applied to all circuits using the 0M08 circuit.

〔Effect of the invention〕

As described above, according to the present invention, the temperature of the computer system is detected by the temperature monitor, and the operating voltage and operating frequency are changed based on the temperature data.
It is possible to prevent the generation of noise, which has been a problem in conventional power switching circuits, and the power switching circuit can be omitted, which has the effect of reducing power loss.

[Brief explanation of the drawing]

1 to 5' and 6 are diagrams showing an embodiment of the present invention, and FIG. 6 is a diagram showing a conventional system. (11 is the computer system, (5) is the temperature monitor, (9)
is a voltage adjustment circuit, aS is an A/D conversion circuit, α is a clock control circuit, and +13 is a frequency division circuit. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] CMO whose power generation varies depending on operating frequency and operating voltage
A temperature monitor that measures the circuit temperature of a computer system composed of S components, a DC/DC converter that supplies power to the computer, and a reference output voltage of this DC/DC converter.
a voltage adjustment circuit that supplies an operating voltage to the calculator by adjusting it in inverse proportion to the rise and fall of the temperature measured by the temperature monitor;
An A/D conversion circuit that converts the operating voltage to the computer outputted from this voltage adjustment circuit into a digital value, a reference clock generation circuit that generates the fundamental frequency that becomes the fundamental frequency of the computer, and this fundamental frequency that is converted into the above-mentioned A/D conversion circuit. It consists of a clock control circuit that supplies the operating frequency to the computer while controlling it proportionally based on the subsequent digital value.When the temperature is low, it selects a high operating voltage and operating frequency to increase the processing speed of the computer. , a power control circuit characterized in that when the temperature is high, a low operating voltage and operating frequency are selected to reduce the processing speed of the computer, and the circuit temperature is controlled within an allowable range while controlling the generated power.