JP2003008270A - Acoustic amplifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an acoustic amplifying device compact and restrict low noises as a whole from a fan motor, by raising the cooling efficiency of an output step transistor by the fan motor, thereby reducing the adverse influences on an acoustic amplifying action in the device provided with the output step transistor and the fan motor for cooling the output step transistor. SOLUTION: A cylindrical body 17, through which a cooling air from a fan motor 16 passes is constituted by a mount part member 26 for holding an output step transistor 15, and a guide member 18 for guiding the cool air from the fan motor 16 to the mount member 26, is provided within the cylindrical body 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic amplification apparatus having an output stage transistor for amplifying and processing an input signal, and particularly when the output stage transistor generates heat during operation to cause a temperature rise. , An improvement in means for suppressing the temperature rise so that the output stage transistor is not damaged by the temperature rise.

[0002]

2. Description of the Related Art An output-stage transistor emits heat and becomes high in temperature as it operates, but is damaged when the temperature exceeds a certain level. Therefore, in order to avoid such damage, it is necessary to cool the output stage transistor during operation of the output stage transistor or to suppress the output of the output stage transistor itself before use. In an acoustic amplification device including an output stage transistor, conventionally, as a means for suppressing a temperature rise of the output stage transistor, a substrate that holds the output stage transistor or one in which several heat radiation fins are provided in the vicinity thereof, It is known that a fan motor is arranged in the vicinity of the output stage transistor to apply cooling air to the output stage transistor, and a device configured to absorb the air heated by heat generation.

However, in an acoustic amplification device in which several radiation fins are provided on the substrate that holds the output stage transistors, the cooling action cannot be said to be sufficient with the radiation fins alone and the output stage transistors will be damaged. On the other hand, on the other hand, there is a problem in that the radiation fins must be large enough to surely obtain a large cooling action, resulting in an increase in size of the entire apparatus.

On the other hand, in an acoustic amplification device having a fan motor disposed near the output stage transistor,
Since the cooling air from the motor directly hits the output stage transistor, a certain cooling effect can be obtained. However, since the cooling air from the fan motor is sent to other than the output stage transistor, there is a problem that the efficiency of the blowing cooling is poor as a result.

As a method of solving this problem and reliably cooling the output stage transistor, it is possible to use a fan motor having a large output. It should be noted that the use of the output-stage transistor with suppressed output results in the use of the output-stage transistor having a sufficient margin, and the output-stage transistor is not used up to that extent, resulting in waste.

In order to solve such a problem, a fan motor and a cylinder through which cooling air from the fan motor passes are provided, and a part of the cylinder is formed by a mount member for an output stage transistor. The following sound amplification device is conceivable.

In the acoustic amplification device having such a configuration, the fan
Since the cooling air from the motor passes near the mount member of the output stage transistor, the cooling heat is surely given near the mount member of the output stage transistor, and the fan motor is installed near the conventional output stage transistor. The cooling effect is higher than that of the acoustic amplification device having the above configuration, and damage due to high heat of the output stage transistor can be more reliably avoided.
In addition, it is possible to use the output stage transistors with their full potential.

Further, even if the output of the fan motor used is small, no problem occurs due to the high cooling efficiency. Therefore, the noise amplification caused by the fan motor is caused by the sound amplification which is the function of the apparatus. It is also possible to suppress adverse effects. In addition, since there is no cooling fin, the size of the entire apparatus is not increased.

[0009]

However, in the acoustic amplifying apparatus having such a structure, the cooling air from the fan / motor does not contact the mounting member of the cylindrical body or passes through the vicinity of the mounting member. As a result, a large amount of cooling air cannot be said to contribute strongly to the cooling heat supply to the output stage transistor, that is, to the heat removal from the output stage transistor, resulting in efficient heat removal from the output stage transistor. Therefore, a fan motor having a large output is required to obtain more reliable cooling of the output stage transistor, and this causes a problem that noise accompanying the operation of the fan motor increases.

The present invention has been made in view of the above circumstances, and even in the case of a fan motor having a small output, the cooling heat is supplied to the output stage transistor more efficiently, and as a result, the output stage transistor is supplied. Is sufficiently cooled without damage due to temperature rise, and by using a fan motor with a small output, the device body can be made even more compact. Provided is an acoustic amplification device capable of further suppressing the adverse effect of noise on the sound.

[0011]

SUMMARY OF THE INVENTION The present invention comprises a member for guiding the direction of the cooling air so that the cooling air blows on the mount member of the output stage transistor, which is the heat generating portion of the cylindrical body through which the cooling air passes. The sound amplification device is configured as follows.

The detailed structure is such that, in an acoustic amplifier having an output stage transistor and amplifying and processing an input signal and outputting the same, a mount member for holding the output stage transistor, a fan motor for outputting cooling air, A tubular body configured to include the mount member is provided to allow cooling air from the fan motor to pass therethrough, and the flow of the cooling air from the fan motor to the mount member is provided inside the tubular body. The acoustic amplification device is provided with a guide member for guiding.

In the sound amplification device having such a configuration, the fan
When the cooling air from the motor is sent into the cylinder, the cooling air is guided by the guide member toward the mount member.

In the present invention, the guide member may be, for example, a semi-cylindrical member formed by bending it in a wave shape in the traveling direction of the cooling air. Further, the present invention can add means for controlling the output of the fan motor based on the measurement result of the temperature of the output stage transistor or the vicinity thereof and / or corresponding to the output of the output stage transistor. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to this embodiment.

As shown in FIGS. 1 to 4, the sound amplifying device 1 comprises a main body casing 2, a sound amplifying means 3, and a cooling means 4.

The body casing 2 is, as shown in FIG.
It mainly comprises a front plate 5, a bottom plate 6, a rear plate 7, and a cover body 8. An operation unit 9 and a display unit 10 are arranged on the front plate 5. The operation unit 9 is for performing ON / OFF of the main power source, operation of output, etc., and the display unit 10 displays the ON state of the main power source, input of an excessive signal, temperature of the cylindrical body 17, etc. To do.

The sound amplification means 3 is a power supply means (not shown).
And an amplifier circuit means 11 for amplifying and processing a signal relating to the input sound. The power supply means includes a transformer 12, a rectifying diode 13 and the like, and converts an AC power supply into a desired voltage and rectifies it. The amplifier circuit means 11 includes a circuit board 14, an output stage transistor 15, a resistor (not shown),
It is configured to include a capacitor (not shown) and the like, and substantially amplifies an input signal relating to sound.

The acoustic amplification device 1 is provided with a cooling means 4 for preventing the rectifying diode 13 and the output stage transistor 15 from being damaged due to high temperature. Cooling means 4
Is a fan motor 16, a cylinder body 17, and a guide member 1.
8 and control means 19.

The fan motor 16 sends out cooling air. The fan motor 16 has an amplifier circuit means 11
Although it is arranged below the circuit board 14, the air is taken in through the louver 20 provided on the front plate 5 to blow air. The fan motor 16 is mainly composed of a sirocco fan (not shown), a rotary drive motor (not shown) and a casing 21, and discharges cooling air in a direction perpendicular to the rotation axis of the sirocco fan. It is configured.

The cylindrical body 17 takes in the cooling air from the fan motor 16 and allows it to pass therethrough, and then discharges the cooling air. The cylindrical body 17 has a rectangular cross section,
It is made of aluminum and has a mirror-finished surface of alumite. The cylindrical body 17 extends in the left-right direction with respect to the front-rear direction of the main body casing 2, is further bent and extends in the rearward direction perpendicular to the main body casing 2, and both ends thereof are formed in the exhaust port 22. The exhaust port 22 fits into an opening (not shown) formed in the rear plate 7 of the main body casing 2 and is substantially flush with the rear face of the rear plate 7.

Further, the cylindrical body 17 is provided with an intake port 23 for taking in the cooling air from the fan motor 16 at the center of the portion extending in the horizontal left-right direction. fan·
The cooling air outlet 24, which is formed in a rectangular shape in the casing 21 of the motor 16, has a cylindrical body 17 through a frame member 25.
Is connected to the intake port 23 in an airtight state.

The top surface of the cylindrical body 17 serves as a mount member 26 for holding the output stage transistor 15 and the rectifying diode 13. That is, the output stage transistor 15 and the rectifying diode 13 are held by the mount member 26, which is the top surface portion of the tubular body 17, via an insulating heat transfer sheet (not shown).

A cooling air splitting member 27 for splitting the cooling air from the fan motor 16 into the left and right directions is disposed inside the intake port 23 of the cylindrical body 17 which faces the intake port 23. A guide member 18 for guiding the cooling air from the fan motor 16 to the bottom surface of the mount member 26 after the cooling air from the fan / motor 16 flows into the cylinder body 17 is provided and screwed. . The guide member 18 has a semi-cylindrical shape with an arcuate cross section, and is formed by bending in a wavy shape in the guide traveling direction of the cooling air.

The cooling means 4 is provided with control means 19 for controlling the output of the fan motor 16. That is, as shown in FIG. 4, the control means 19 has the temperature sensor 2 disposed in contact with the cylindrical body 17 which is substantially the same as the output stage transistor 15 and the rectifier diode 13 in terms of temperature measurement.
8, an output detection unit 29 that electrically detects the output of the output stage transistor 17, an amount of cooling air to be sent into the cylindrical body 17 based on information from the temperature sensor 28, and an output detection unit 29. The predetermined amount of cooling air is determined in accordance with the detection result from the fan motor 16, the noise to the acoustic amplification means 3 of the fan motor 16 is smaller, and an appropriate output amount of the fan motor 16 is calculated to output the control signal to the fan. -It is comprised including the microcomputer 30 sending to the motor 16.

In the acoustic amplification device 1 having the control means 19 having such a configuration, the microcomputer 30 receives two detection results, that is, the temperature of the output stage transistor 15 and the output of the output stage transistor 15, and the fan motor 16 outputs the detection result. The cooling means 4 is configured to operate so that the output of the fan motor 16 is controlled to be as small as possible so that noise does not hinder the sound amplification function, which is the function of the apparatus.

The acoustic amplification device 1 is constructed as described above. The operation of the acoustic amplification device 1 will be described below. The operator operates the operation unit 9 of the acoustic amplification device 1 to turn on the main power source, and then sets a desired amplification amount to operate the acoustic amplification device 1. Here, the sound amplification means 3 is
An attempt is made to amplify and process a signal related to the input sound.

At this time, in the acoustic amplification device 1, the rectifying diode 13 forming the power supply means and the output stage transistor 15 forming the amplification processing means 11 generate heat as they operate. Here, in the acoustic amplification device 1, the cooling means 4 operates. That is, the microcomputer 30 detects the temperature detected values of the rectifying diode 13 and the output stage transistor 15 from the temperature sensor 28, and outputs the output stage transistor 15 from the output detection unit 29.
In the range in which the rectifier diode 13 and the output stage transistor 15 are not heated and damaged due to the output value of the noise, the noise from the fan motor 16 is amplified and processed by the amplification processing means 11.
The control signal is sent to the fan motor 16 such that the output that has the least adverse effect on

Here, the fan motor 16 is the microcomputer 3
0 based on a control signal of 0, the rotary drive motor is rotationally driven to output by the sirocco fan, intake is made from the louver 20 of the front plate 5, and the cylindrical body 1 is made to come out from the outlet 23.
Cooling air is blown into the cylindrical body 17 through the intake port 23 of 7. The cooling air sent into the cylindrical body 17 is divided by the dividing member 27.
Is divided into left and right parts, and then sent to the guide member 18.

Here, the cooling air sent to the guide member 18 is guided in the guide direction of the guide member 18. In other words, the guide member 18 has a semi-cylindrical shape, is formed by being bent in a wave shape with respect to the traveling direction of the cooling air, and is in a posture of guiding the mount member 26. As a result, the cooling air has a substantially cylindrical cross section and is sent to the mount member 26 while undulating. Therefore,
The cooling air hits the bottom surface of the mount member 26, undulates the bottom surface of the mount member 26, chills, and gives cooling cold heat (heat absorption) while traveling, and is exhausted from the exhaust port 22.

That is, since the cooling air strikes the bottom surface of the mount member 26 and takes heat to be exhausted from the exhaust port 22, the heat taken by the cooling air from the rectifying diode 13 and the output stage transistor 15 is exhausted from the exhaust port 22 to the main body casing 2. Will be exhausted to the outside.

As a matter of course, from the rectifying diode 13 and the output stage transistor 15 to the mount member 2 of the cylindrical body 17,
The heat conducted to parts other than 6 is also exhausted from the exhaust port 22 to the outside of the main body casing 2 by the cooling air. However, since the mount member 26 holds the rectifying diode 13 which is a heating element and the output stage transistor 15, the mounting member 26 is cooled (heat taken) largely as compared with the other portions of the cylindrical body.

Therefore, in the acoustic amplification device 1, the cooling means 4
As compared with the case where the cooling air from the fan motor 16 of FIG. 1 simply passes through the inside of the cylindrical body 17, by strongly acting on the mount member 26 which is the heat generating portion of the cylindrical body 17, the cooling effect, that is, the heat removal effect is correspondingly produced. It will be big.

That is, in the acoustic amplification device 1, the cooling effect of the cooling means 4 is high, and accordingly, the cooling means 4 itself can be made compact and the overall size of the device can be reduced. Further, since the output of the fan motor 16 can be suppressed to a low level, the noise to the sound amplification means 3 can be suppressed to a corresponding extent, and the adverse effect on the amplification effect can be reduced. There is.

In the acoustic amplification device 1, the rectifying diode 13
The output-stage transistor 15 and the output-stage transistor 15 are provided on the top surface of the mount member 26, that is, on the outer surface of the tubular body 17, but may be provided inside the tubular body 17. In such a configuration, the cooling air from the fan motor 16 directly gives cold heat to the rectifier diode 13 and the output stage transistor 15, and also gives cold heat to the mount member 26 holding the rectifier diode 13 and the output stage transistor 15. This will greatly contribute to heat loss.

In the acoustic amplification device 1, the fan motor 16
Is configured with sirocco fans, but other types of fans may be used.

In the sound amplifying apparatus 1, the temperature sensor 28 of the control means 19 is arranged in contact with the cylindrical body 17 which is substantially the same as the output stage transistor 15 and the rectifying diode 13 in temperature measurement. As long as it is possible to send an appropriate temperature detection result to the microcomputer 30, it may be arranged near the output stage transistor 15 and the rectifying diode 13 in accordance with the arrangement of members.

The output of the fan motor 16 is controlled by detecting the temperature of the output stage transistor 15 and the rectifying diode 13 and the output stage transistor 1 in the acoustic amplifier 1.
Although it is performed based on the output detection value of No. 5, the configuration may be performed based on only the detection value of the temperature of the output stage transistor 15 or only the output detection value of the output stage transistor 15.

In the sound amplifying apparatus 1, in the control means 19, the temperature sensor 28 detects the temperature of the output stage transistor 15, the output detecting section 29 detects the output of the output stage transistor 15, and the microcomputer 30 detects them. The output of the fan motor 16 is controlled based on the detection result. The thermistor as a temperature sensor, a comparator (op-amp) that compares the voltage from the thermistor with a reference voltage, and a switch of the fan motor 16 A fan for supplying cooling air to the output stage transistor 15 and the rectifying diode 13 by providing one set (analog control) or a plurality of sets (digital control) of the transistors.
A configuration for controlling the output of the motor 16, that is, a configuration for control by a logic circuit may be used. In the above digital control, the output of the fan motor 16 is controlled in stages.

On the other hand, the output detection of the output stage transistor 15 without using the microcomputer 30 is performed by the output stage transistor 15
There is a configuration in which the detected value of the current is combined with an operational amplifier.

In the sound amplifying apparatus 1, the guide member 18 has a semi-cylindrical shape with an arcuate cross section and is formed by bending it in a wave shape in the direction of guide of the cooling air. It is desirable to make an appropriate selection based on the cross-sectional shape of the cylindrical body 17, the difficulty of manufacturing due to the material of the guide member 18, etc., the method of attachment and fixation to the cylindrical body 17, the degree of expansion of the cooling air, etc. Further, it is preferable that the disposition position of the guide member 18 is appropriately set based on the shape of the cylindrical body 17, the workability of attaching the guide member 18, and the like.

In the acoustic amplification device 1, the cylindrical body 17 is U-shaped, but the total area and heat generation amount of the holding surface of the rectifying diode 13 and the output stage transistor 15 to be cooled, the size and shape of the entire device, and the cylindrical shape. It is desirable to select as appropriate based on the thermal conductivity of the body 17 and the degree of heat radiation.

[0043]

According to the present invention, in an acoustic amplification apparatus comprising an output stage transistor and a means for cooling the output stage transistor, a cylindrical body for supplying cooling air to the output stage transistor is held by the output stage transistor. And the guide member for guiding the cooling air to the mount member are provided in the cylindrical body, the cooling effect of the output stage transistor is high, and the cooling device is accordingly compact. By doing so, it is possible to downsize the entire device, and by suppressing the output of the fan motor that sends out cooling air, it is possible to reduce the adverse effects of noise on the sound amplification effect. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main configuration of a cooling unit according to an embodiment of the present invention including a partial cutout.

FIG. 2 is a perspective view illustrating a configuration of a main part of a cooling unit according to the embodiment of the present invention.

FIG. 3 is a perspective view showing the overall configuration of an embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of control means according to an embodiment of the present invention.

[Explanation of symbols]

1: Acoustic amplifier 2: Body casing 3: Sound amplification means 4: Cooling means 13: Rectifying diode 15: Output stage transistor 16: Fan motor 17: Cylindrical body 18: Guide member 19: Control means 26: Mount member

Claims (3)

[Claims] 1. An acoustic amplification device comprising an output stage transistor for amplifying an input signal and outputting the amplified signal, a mount member for holding the output stage transistor, a fan motor for outputting cooling air, and a fan motor for the same. And a guide member that guides the flow of the cooling air from the fan / motor toward the mount member. An acoustic amplification device in which is provided. 2. The acoustic amplification according to claim 1, wherein the guide member has a semi-cylindrical shape with an arcuate cross section, and is formed by bending in a wavy shape with respect to a guide traveling direction of the cooling air. apparatus. 3. A temperature sensor arranged in contact with or in the vicinity of an output stage transistor, and based on information from the temperature sensor, the amount of cooling air to be sent into the cylinder is judged to determine the fan motor. 3. A device for controlling the output, and / or a device for detecting the output of the output stage transistor, determining the amount of cooling air corresponding to the detection result, and controlling the output of the fan motor. Item 2. The sound amplification device according to item 2.