JP2002016445A - Warm-up judjing circuit, judjing method used therefor and amplifier mounting device mounted with the same circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a warm-up judging circuit capable of surely judging the completion of warming-up in a short time. SOLUTION: A power on/reset judging circuit 14 supplies a voltage Va after power source on or reset, a primary low-pass filter composed of a resistor R and a capacitor C is connected to a terminal, which becomes voltage zero during power source off or reset, and a time constant to be determined by these resistor R and capacitor C is previously selected to become almost equal with warm-up time at the time of measurement. When a CPU 13 is started by power source on or reset, that voltage is read through an A/D converter 12 and compared with a predetermined voltage value from the power source on/reset judging circuit 14 and when a sample value is low, it is judged as power source being on during the non-completion of warming-up, namely, at the time of cold start, and when the sample value is high, it is judged as reset after the completion of warming-up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm-up judging circuit, a judging method used therefor, and an amplifier mounting apparatus having the same, and more particularly to a warm-up judging circuit for judging a warmed-up state of an amplifier.

[0002]

2. Description of the Related Art Among high-frequency amplifiers, especially high-power amplifiers for transmission and the like have the characteristic that their amplification characteristics are susceptible to temperature, input level and the like due to the characteristics of the constituent elements.

In recent years, in addition to simply amplifying an RF signal, a type in which a specific signal component of an input signal is controlled in advance and then input to an amplifier to control noise such as a harmonic component after amplification to a low level. Extracts a part of the output signal of the main amplifier or main amplifier, extracts the noise component from the difference from the input signal, amplifies the extracted signal with the sub-amplifier, and superimposes the noise component on the output signal of the main amplifier so as to cancel the noise component By doing so, an amplifier or the like called a feed-forward control amplifier that constitutes an amplifier with low noise can provide power efficiency,
It has been put into practical use from the viewpoint of miniaturization of the device.

In a general amplifier, since the characteristics change due to heat generation or the like after the power is turned on, a warm-up lamp or the like is prepared until the output characteristics are stabilized, and an operator is notified that the output is in an unstable state. In many cases, a warm-up determination circuit is provided.

In particular, in an amplifier of the type which cancels noise or the like by controlling a certain signal component as described above, the amplifier output fluctuates more because of initial setting immediately after power-on or the like. The need for a warm-up determination circuit is increasing. Therefore, it is certain that the warm-up is completed after the initial start-up of the control data set and the like of the apparatus has been completed and the heat of the amplifier itself has reached an equilibrium point and stabilized.

[0006]

As a method of making the above determination, for example, a method of previously measuring a warm-up time until a thermal equilibrium state is maintained, and fixedly setting the value as the warm-up time. However, this method has a problem that the warm-up time is fixedly secured even when the warm-up is not required when the device is reset.

Also, two temperature sensors are prepared, one is arranged at the outside air temperature and the other is arranged near the amplifier, and the temperature sensor near the amplifier utilizes the fact that the heat generated by the amplifier is large, and there is a difference between the temperatures. There is also a method of judging that the warm-up is completed when it exceeds a certain level.

However, in the method of comparing the two, if the ambient temperature differs due to factors such as the installation location and the season, or if the same device is used side by side, the ambient environment (for example, air volume) of each device is different. Influencing the ambient temperature and the temperature characteristics near the amplifier, and judging only by the temperature difference between them, it may be erroneously judged that the warm-up is completed even though the thermal equilibrium state has not been reached yet, or In some cases, it is necessary to reset the parameters of individual amplifiers during the installation work of the device, and there is a problem that the work becomes complicated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to make it possible to reliably determine the completion of warm-up in a short time, a warm-up determining circuit, a determining method used therefor, and an amplifier mounting apparatus using the same. Is to provide.

[0010]

A warm-up judgment circuit according to the present invention is a warm-up judgment circuit for judging whether or not the warm-up of an amplifier is completed, wherein the temperature of a device mounting the amplifier is close to the outside air temperature. Power on / reset determining means for determining in a short time whether a cold start in which the power is turned on in a state where the power is turned on and a reset after the amplifier has sufficiently warmed up;
Judging means for judging completion of warm-up at the time of the cold start by comparing an output of a temperature sensor provided near the amplifier with an output of the power on / reset judging means; The warm-up completion determination is performed by reliably monitoring the thermal equilibrium state of the amplifier, and a warm-up completion report is made in a short time when the amplifier is reset after the warm-up.

The warm-up judgment method according to the present invention comprises:
A warm-up judging method for judging whether or not warm-up of an amplifier is completed, wherein a cold start in which power is turned on in a state where a temperature of a device mounting the amplifier is near an outside air temperature is performed, and The output of the power on / reset determination means for determining in a short time whether the amplifier has been reset after the amplifier has sufficiently warmed up is compared with the output of a temperature sensor installed near the amplifier, and the output during the cold start is determined. A step of judging warm-up completion, performing a warm-up completion judgment by reliably monitoring the thermal equilibrium state of the amplifier at the time of the cold start, and providing a warm-up completion report in a short time at the time of reset after the warm-up of the amplifier. I'm trying to do it.

An amplifier mounting apparatus according to the present invention is an amplifier mounting apparatus in which an amplifier is mounted, and a cold start is performed in which power is turned on in a state where the temperature of the apparatus in which the amplifier is mounted is near the outside air temperature. Power-on / reset determination means for determining in a short time whether the amplifier has been reset after the amplifier has sufficiently warmed up, and an output of a temperature sensor installed near the amplifier and the power-on / reset determination means.
A determination unit for determining the completion of warm-up at the time of the cold start by comparing the output of the amplifier with a reset determination unit, wherein the warm-up determination circuit includes a thermal equilibrium state of the amplifier at the time of the cold start. Is surely monitored to determine the warm-up completion, and a warm-up completion report is made in a short time when the amplifier is reset after the warm-up.

That is, in the warm-up determination circuit of the present invention, the power of the apparatus is turned on (hereinafter referred to as a cold start) in a state where the temperature of the apparatus is near the outside air temperature without being turned on. A power-on / reset determination circuit for determining in a short time whether the amplifier has been reset after the amplifier has sufficiently warmed up, and a temperature sensor installed near the amplifier and a temperature characteristic change of the amplifier itself (temperature characteristic curve) And a judgment circuit for judging whether the temperature has reached an equilibrium state and judging the warm-up completion at the time of a cold start, and reliably monitoring the thermal equilibrium state of the amplifier at the time of a cold start to complete the warm-up. It is characterized in that a judgment is made or a warm-up completion report is made in a short time at the time of reset after warm-up.

In the warm-up determination circuit according to the present invention, a power-on / reset determination circuit for determining in a short time whether the amplifier is reset after the amplifier has sufficiently warmed up, and a temperature sensor. It is installed near the amplifier and has a level detection function to detect the input level of the amplifier, and corrects the heat value of the amplifier that changes according to the input level, that is, the deviation of the temperature equilibrium point, and based on the data after the correction. A determination circuit for evaluating the temperature characteristic change (temperature characteristic curve) to determine whether or not an equilibrium state has been reached, so as to more reliably determine the warm-up completion at the time of a cold start; Determine the warm-up completion by monitoring the status more reliably, or warm up in a short time when resetting after warm-up. It is characterized in that it has to perform a completion report.

As described above, it is determined in a short time whether the apparatus has been started up in the cold start state when the apparatus is started up or reset after the amplifier has sufficiently warmed up, and the temperature characteristic change of the amplifier itself during the cold start. By monitoring the (temperature characteristic curve) and confirming whether the temperature has reached an equilibrium state, it is possible to determine the warm-up completion in a short time and reliably.

In this type of warm-up determination, an image reading device described in Japanese Patent Application Laid-Open No. Sho 62-117644 samples an image density signal at a certain time interval to stabilize light output, There is a method in which the warm-up is completed when the change amount decreases.

If the above method is applied to an amplifier, it is only necessary to directly monitor the amplifier output and determine its stability. However, since the input of the amplifier always fluctuates, the output characteristics also change. And its realization is very difficult.

[0018]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a warm-up determination circuit according to one embodiment of the present invention. In FIG. 1, a warm-up determination circuit 1 includes a buffer 11 and an A / D (analog / digital) converter 12.
, A CPU (Central Processing Unit) 13, a power on / reset determination circuit 14, a memory 15, and a clock circuit 16, and warms up from the output of the temperature sensor 2 disposed near the amplifier 3. Make a decision.

The buffer 11 outputs the output of the temperature sensor 2 to A /
The conversion is performed to a level that can be taken into the D converter 12. The A / D converter 12 converts an analog signal such as temperature information from the buffer 11 into a digital signal. The CPU 13 is connected to the A / D converter 12 and performs arithmetic processing.

The power-on / reset determination circuit 14 supplies a voltage Va after power-on or reset, and a primary low-pass composed of a resistor R and a capacitor C at a terminal where the voltage becomes zero during power-off or reset. A filter is connected, and a time constant determined by the resistor R and the capacitor C is previously selected so as to be substantially the same as the warm-up time at the time of measurement.
When the PU 13 rises, its voltage is converted to the A / D converter 12
Read through and compare with a predetermined voltage value, and if the sample value is low, while warm-up is not completed,
That is, it is determined that the power is turned on at the time of a cold start, and if the sample value is high, it is determined that the power is reset after the warm-up is completed.

The memory 15 includes a nonvolatile memory for storing a judgment value necessary for the judgment of the power-on / reset judgment circuit 14 and a parameter for judging a temperature rise tendency, and a RAM (random access memory) necessary for the operation. . The clock circuit 16 is used for the operation of the CPU 13 and
This is a circuit that is a clock source for various timers.

FIG. 2 is a diagram showing a temperature rise curve detected by the temperature sensor 2 of FIG. The temperature rise curve detected by the temperature sensor 2 installed near the amplifier 3 will be described with reference to FIG.

First, when the power is not turned on, the temperature of the entire apparatus becomes close to the outside air temperature (point a in FIG. 2). When the power is turned on to the device, the amplifier 3 generates heat as the power is consumed, and the temperature gradually rises (point b in FIG. 2). Thereafter, the inside of the device also reaches a thermal equilibrium state due to the heat transfer characteristics with the surrounding environment, and reaches the point c in FIG.

Here, the value of the temperature sensor 2 is sampled every fixed period (measurement period t in FIG. 2), and the temperature change amount (Temp in FIG. 2) for each period is obtained. , And becomes almost zero at the time of saturation.

At the time of a cold start, the output voltage of the primary low-pass filter of the power-on / reset determination circuit 14 is low. If a reset is performed at this time, the power-on / reset determination circuit 14 determines that the power is on without determining a reset. However, at this time, since the amplifier 3 itself is not warmed up, a warm-up operation is required, and it may be determined that the cold start power is on.

Conversely, consider a case where the power is turned off after a lapse of time after the power is turned on and the output voltage of the primary low-pass filter of the power on / reset determination circuit 14 is increased. At this time, when the power is turned off, the voltage charged in the primary low-pass filter of the power-on / reset determination circuit 14 is gradually discharged since the power input Va becomes zero, and the output voltage gradually decreases.

Therefore, when the power is turned off and on instantaneously, the power-on / reset determination circuit 14 determines that the discharge is small and reset after warm-up, but the amplifier 3 is sufficiently warmed up. , May be determined to be reset after warm-up. If a long time has elapsed after the power is turned off, a normal cold start is performed.

FIG. 3 is a flowchart showing the operation of the warm-up determination circuit 1 of FIG. The operation of the warm-up determination circuit 1 according to one embodiment of the present invention will be described with reference to FIGS.

When the CPU 13 is activated by turning on or resetting the power, the CPU 13 initializes parameters (step S1 in FIG. 3) and determines a judgment value of the power on / reset judgment circuit 14 and a unit time for judging a temperature equilibrium state. Is loaded from the memory 15.

Thereafter, the CPU 13 takes in the voltage of the power-on / reset determination circuit 14 through the A / D converter 12 and compares it with the determination value set by the initialization of the above-mentioned parameters, and performs a cold start or after a warm-up. It is determined whether it is rising (step S2 in FIG. 3).

When the CPU 13 determines that a cold start has occurred, the CPU 13 reads the value of the temperature sensor 2 and stores
It is stored as a (step S3 in FIG. 3), and a temperature monitoring timer (not shown) is counted (step S4 in FIG. 3).

The CPU 13 monitors the elapse of the timer of the temperature monitoring timer, and when the timer elapses (when a timeout occurs) (step S5 in FIG. 3), reads the value of the temperature sensor 2 and stores it in the memory 15 as Tb (latest value). Store (Fig. 3
Step S6). If the timer has not elapsed, the CPU 13 repeats the counting operation again in step S4.

The CPU 13 stores the value of the temperature sensor 2 in the memory 1
5, the temperature difference Temp is calculated as Temp = Tb−T
The value is calculated by a, the value of Ta is updated to Tb (the latest value) for the next measurement, and the temperature monitoring timer is initialized (step S7 in FIG. 3).

The CPU 13 compares the value of the temperature difference Temp with the temperature change amount comparison value Tth previously stored in the memory 15 (step S8 in FIG. 3). If the temperature difference Temp is larger, the value per unit time is used. It is determined that the temperature change rate is large and the thermal equilibrium state has not yet been reached, and the process returns to step S4.

If the temperature difference Temp <the temperature change amount comparison value Tth, the CPU 13 reports that warm-up has been completed assuming that a thermal equilibrium state has been reached (step S9 in FIG. 3), and ends the processing.

On the other hand, if the CPU 13 determines in the step S2 that the startup is after the warm-up, the CPU 13 makes a transition to the process in the step S9, reports the completion of the warm-up, and ends the process.

As described above, when the power is turned on after power-on or reset, the power-on / reset determination circuit 14 determines whether or not warm-up is necessary, that is, whether or not a cold start is performed, without being affected by the outside air temperature. In the case of a cold start, the value of the actual temperature sensor 2 is monitored only in the case of a cold start, and the temperature equilibrium is determined from the temperature characteristic curve. A warm-up completion report can be made when this is reliably detected.

Regarding the temperature sensor 2 used in the present invention, especially in recent amplifiers such as an amplifier of a type that cancels noise by controlling a certain signal component, the amplifier is used for the purpose of ensuring the reliability of the device. It often has a function of constantly monitoring the temperature, outputting an alarm when the temperature is abnormal, or interrupting the transmission output. The output of the monitoring temperature sensor can be used in the present invention.

A / A in the warm-up determination circuit 1
It goes without saying that the D converter 12, the CPU 13, the memory 15, and the like can also be shared with assets for detecting the state of the device (such as an alarm) and controlling the device.

FIG. 4 is a block diagram showing a configuration of a warm-up determination circuit according to another embodiment of the present invention. 4, a warm-up determination circuit 4 according to another embodiment of the present invention has the same configuration as the warm-up determination circuit 1 according to one embodiment of the present invention shown in FIG. 1 except that a level detector 41 is provided. The same components are denoted by the same reference numerals. The operation of the same component is the same as that of the embodiment of the present invention.

The warm-up determination circuit 4 according to another embodiment of the present invention is provided with the level detector 41, so that it is possible to accurately perform the warm-up determination at the time of a cold start. The level detector 41 detects the input level to the amplifier 3, and the detection result is taken into the CPU 13 through the A / D converter 12.

FIG. 5 is a diagram showing a temperature rise curve for each input level detected by the temperature sensor 2 of FIG. With reference to FIG. 5, the heat value according to the input level will be described.

For example, when the input level is near the rated level, the heat generated by the amplifier 3 is almost at the maximum. When the input level is low or in an extreme case, when the input is zero, the amount of power amplification is small. Few.

Therefore, as shown in FIG. 5, the temperature equilibrium point due to the self-heating changes according to the input level, such as the characteristic indicated by a at the time of rated input and the characteristic indicated by b at zero input.

Therefore, the amount of temperature change per unit time is
Since the change rate increases as the input level increases, the temperature change comparison value Tth for determining the warm-up completion for each input level is set in advance in the memory 15 in several steps so as to increase as the input level increases. By using the temperature change amount comparison value Tth according to the input level,
Accurate warm-up completion determination can be performed regardless of the input level.

With respect to the input level detector used in the present invention, in recent amplifiers, the input is constantly monitored to secure the reliability of the device, and an excessive input state is detected, and an alarm is output when an abnormality occurs. In many cases, the function of cutting off the transmission output is provided, and the input level detector signal can be used in the present invention.

If the selection of the temperature change amount comparison value Tth fluctuates due to a short-period change in the input level, the temperature change is relatively slow (on the order of seconds). Change amount comparison value Tth
Needless to say, it is sufficient to select.

[0048]

As described above, according to the present invention, in a warm-up judging circuit for judging whether or not warm-up of an amplifier is completed, a power supply is provided in a state where the temperature of a device in which the amplifier is mounted is close to the outside air temperature. The output of the power-on / reset determining means for determining in a short time whether a cold start in which the amplifier is turned on and resetting after the amplifier has sufficiently warmed up, and the temperature sensor installed near the amplifier. The output is compared with the output to determine the warm-up completion at the time of a cold start.At the time of a cold start, the thermal equilibrium state of the amplifier is securely monitored to determine the warm-up completion. By reporting the warm-up completion, the warm-up completion can be determined quickly and reliably. There is an effect that.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a warm-up determination circuit according to one embodiment of the present invention.

FIG. 2 is a diagram showing a temperature rise curve detected by the temperature sensor of FIG. 1;

FIG. 3 is a flowchart illustrating an operation of the warm-up determination circuit of FIG. 1;

FIG. 4 is a block diagram showing a configuration of a warm-up determination circuit according to another embodiment of the present invention.

5 is a diagram showing a temperature rise curve for each input level detected by the temperature sensor of FIG. 4;

[Explanation of symbols]

 1,4 Warm-up determination circuit 2 Temperature sensor 3 Amplifier 11 Buffer 12 A / D converter 13 CPU 14 Power on / reset determination circuit 15 Memory 16 Clock circuit 41 Level detector

Continued on the front page F term (reference) 5J090 AA01 AA41 CA02 FA00 FN00 HA25 HA29 HA43 HN08 HN20 KA32 KA34 KA42 KA55 SA14 TA01 TA07 5J091 AA01 AA41 CA02 FA00 HA25 HA29 HA43 KA32 KA34 KA42 KA55 SA14 TA01 TA07

Claims (15)

[Claims] 1. A warm-up judging circuit for judging whether or not warm-up of an amplifier is completed, comprising: performing a cold start in which power is turned on in a state in which a temperature of an apparatus mounting the amplifier is near an outside air temperature. Power-on / reset determination means for determining in a short time whether the amplifier has been warmed and reset after the amplifier has sufficiently warmed up, an output of a temperature sensor installed near the amplifier, and the power-on / reset. Determining means for determining the completion of warm-up at the time of the cold start by comparing the output of the determination means, and performing the warm-up completion determination by reliably monitoring the thermal equilibrium state of the amplifier at the time of the cold start, A warm-up completion report in a short time upon reset after a warm-up of the amplifier. Up judgment circuit. 2. The apparatus according to claim 1, wherein said power-on / reset determination means outputs a low voltage at the time of said cold start, and outputs a high voltage when a lapse of time has elapsed after power-on. Warm-up determination circuit. 3. The warm-up completion at the time of the cold start by monitoring the output of a temperature sensor installed near the amplifier to determine whether the temperature has reached an equilibrium state. 3. The warm-up determination circuit according to claim 1, wherein the warm-up determination circuit is configured to perform the following. 4. The warm-up determination according to claim 1, wherein said determination means monitors a change in a temperature characteristic of said amplifier itself detected by said temperature sensor. circuit. 5. The apparatus according to claim 1, further comprising a level detecting means for detecting an input level of said amplifier, wherein a shift of a temperature equilibrium point of said amplifier, which varies according to an input level detected by said level detecting means, is corrected to perform said cold start. And determining whether or not the warm-up is completed.
The warm-up determination circuit according to any one of claims 1 to 4. 6. A warm-up judging method for judging whether or not warm-up of an amplifier is completed, wherein a cold start is performed in which power is turned on in a state in which a temperature of an apparatus in which the amplifier is mounted is near an outside air temperature. The output of the power on / reset determination means for determining in a short time whether the amplifier has been reset after the amplifier has sufficiently warmed up is compared with the output of a temperature sensor installed near the amplifier. A step of determining warm-up completion at the time of the cold start, performing a warm-up completion determination by reliably monitoring the thermal equilibrium state of the amplifier at the time of the cold start, and a short time at the reset after the warm-up of the amplifier. A warm-up completion report. 7. The power supply on / reset determination unit according to claim 6, wherein a low voltage is output at the time of the cold start, and a high voltage is output after a lapse of time after the power is turned on. Warm-up determination method. 8. The step of judging completion of warm-up includes monitoring an output of a temperature sensor installed near the amplifier to judge whether or not the temperature has reached an equilibrium state. 8. The warm-up determination method according to claim 6, wherein the determination of warm-up completion is performed. 9. The method according to claim 6, wherein the step of determining whether the warm-up is completed monitors a change in a temperature characteristic of the amplifier itself detected by the temperature sensor. The warm-up determination method described in the above. 10. A step of detecting an input level of the amplifier, and correcting a shift of a temperature equilibrium point of the amplifier, which varies according to the detected input level, to determine completion of warm-up at the time of the cold start. The warm-up determination method according to any one of claims 6 to 9, wherein: 11. An amplifier mounting device having an amplifier mounted thereon, wherein a cold start for turning on a power supply in a state where the temperature of the device mounting the amplifier is close to the outside air temperature is performed, and the amplifier is sufficiently mounted. Power on / reset determination means for determining in a short time whether or not the power supply has been reset, and comparing the output of a temperature sensor provided near the amplifier with the output of the power on / reset determination means. A warm-up judgment circuit including a judgment means for judging warm-up completion at the time of the cold start, wherein the warm-up judgment circuit reliably monitors the thermal equilibrium state of the amplifier at the time of the cold start and warms up. Completion determination is made, and a warm-up completion report is made in a short time when the amplifier is reset after warm-up. Amplifier mounting device, characterized in that. 12. The power-on / reset determination means,
The amplifier mounting apparatus according to claim 11, wherein a low voltage is output at the time of the cold start, and a high voltage is output when a time elapses after the power is turned on. 13. The completion of the warm-up at the time of the cold start by monitoring the output of a temperature sensor installed near the amplifier to determine whether or not the temperature has reached an equilibrium state. 13. The amplifier mounting apparatus according to claim 11, wherein the apparatus is configured to perform the following. 14. The amplifier mounting apparatus according to claim 11, wherein said judging means monitors a temperature characteristic change of said amplifier itself detected by said temperature sensor. . 15. The method according to claim 15, further comprising a level detecting means for detecting an input level of said amplifier, wherein a shift of a temperature equilibrium point of said amplifier, which varies according to an input level detected by said level detecting means, is corrected to perform said cold start. The amplifier mounting apparatus according to any one of claims 11 to 14, wherein it is determined whether warm-up is completed.