JPH04330506A - Temperature abnormality controller - Google Patents

Abstract

PURPOSE:To prevent heat generation in an electronic equipment by providing a power interrpting mechanism on the halfway of an AC input power line connected to a power supply. CONSTITUTION:When a cooling fan 4 in the electronic equipment 1a is failed, its internal temperature is increased. When the temperature reaches a certain specified temperature, a temperature sensor 7 detects the temperature abnormality of the equipment 1a. When a temperature abnormality control part 6a receives an abnormality detecting signal, the power interrupting mechanism 9 sends an interruption commanding signal. At the time of receiving the interruption commanding signal, the mechanism 9 interrupts an AC power supply line from the power supply device 3. Since AC power supply to the device 3 is stopped, the output of DC power is also stopped. Thereby DC power supply to a DC output load 5 to be a heating body is stopped, the rise of the internal temperature of the equipment 1a is stopped and then the temperature is lowered.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature abnormality control device, and more particularly to a temperature abnormality control device that is incorporated into an electronic device and is activated when a temperature abnormality occurs in the electronic device.

0002

2. Description of the Related Art FIG. 4 is a block diagram showing an example of the configuration of a conventional electronic device equipped with a temperature abnormality control device. As illustrated, the electronic device 1 includes a switch 2, a power supply device 3, a cooling fan 4, a DC output load 5, a temperature abnormality control section 6, and a temperature sensor 7.

[0003] The power supply device 3 has a function of converting AC power into DC output, and the switch 2 determines whether or not to transmit the AC power input to the electronic device 1 via the AC cord 8 to the power supply device 3. This is a switching device.

[0004] Furthermore, the temperature sensor 7 detects temperature abnormalities within the electronic device 1. The DC output load 5 is a load device that performs the intended work of the electronic device 1, and the DC output load 5 and the temperature abnormality control section 6 are operated by supplying DC power from a power supply device.

[0005] When the temperature abnormality control section 6 receives a temperature abnormality detection signal from the temperature sensor 7, it has a function of sounding an internal buzzer (not shown) to notify a maintenance person of an abnormality in the equipment. Further, the cooling fan 4 is supplied with DC power from the power supply device 3 to cool the electronic device 1 .

[0006] Electronic equipment that pursues miniaturization and low cost as shown in FIG. 4 needs to reduce the cost of each component. As a result, a built-in power supply device 3 is often used that has the minimum necessary functions. Therefore, many of these power supply devices generally do not have on/off control terminals, and may not be able to turn off the power even in an emergency, for example.

[0007] In the conventional example shown in FIG. 4, the operation in an emergency such as occurrence of temperature abnormality will be explained below.

[0008] Now, let us consider a case where the cooling fan 4 fails. Since DC power is supplied to the DC output load 5 and the temperature abnormality control unit 6, heat generation continues regardless of the failure of the cooling fan 4.

[0009] The internal temperature of the electronic device 1 increases with the passage of time. When the temperature reaches a certain predetermined value (specified value), the temperature sensor 7 is activated and sends an abnormality detection signal to the temperature abnormality control section 6.
Send to.

[0010] The temperature abnormality control section 6 recognizes a temperature abnormality in the equipment and sounds a built-in buzzer to alert the maintenance personnel of the equipment.

However, at this stage, since DC power is being output, the DC output load 5 and temperature abnormality control section 6 continue to generate heat until they reach the saturation temperature. Therefore, a maintenance person who recognizes the abnormality must manually turn off the switch 2 to cut off the supply of AC power.

0012

[Problems to be Solved by the Invention] In the conventional temperature abnormality control device as described above, the abnormal value input from the temperature sensor simply sounds an alarm buzzer to notify the maintenance personnel. There are challenges.

(1) If a maintenance person for the equipment is not nearby, it is impossible to correct the abnormality in the equipment. For this reason, a permanent maintenance person is required.

(2) Since the temperature continues to rise until the saturation temperature is reached, there is a possibility that the absolute temperature rating of the semiconductor or other element used in the device will be exceeded.

[0015] In this case, the equipment will be damaged, making it impossible to reuse the equipment. Therefore, the equipment will have to be repurchased.

(3) Depending on the value of the saturation temperature, the medium used may be ignited.

The present invention has been made to solve the above-mentioned problems, and aims to provide a highly safe temperature abnormality control device by adding means for cutting off AC input to equipment when a temperature abnormality occurs. This is the purpose.

[0018]

[Means for Solving the Problems] A temperature abnormality control device according to the present invention is incorporated into an electronic device having a built-in power supply device having no on/off control terminal, and outputs an abnormality detection signal when the temperature inside the device reaches a specified value. A temperature sensor that outputs
It has a temperature abnormality control section that outputs a power cutoff instruction signal in response to this abnormality detection signal, and a power cutoff mechanism that stops power supply to the power supply device in response to this power cutoff instruction signal, and this power cutoff mechanism has an overcurrent detection type. It uses a fuse.

[0019]

[Operation] In the present invention, since a power cut-off mechanism is provided in the middle of the AC input power line that is supplied to the built-in power supply device, when the temperature is abnormal, the power cut-off mechanism is activated by the power cut-off instruction signal, causing an overcurrent. The detection type fuse is blown. Therefore, the supply of AC power to the power supply device is stopped, and control is performed to stop the temperature rise due to the power inside the device.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an electronic device incorporating an embodiment of the temperature abnormality control device according to the present invention. In the electronic device 1a, a switch 2, a power supply device 3, a cooling fan 4
, the DC output load 5, and the temperature sensor 7 are the same as those in the conventional example shown in FIG. 4, so their explanations will be omitted.

The electronic device 1a shown in the embodiment of FIG.
It is constructed by adding a temperature abnormality control section 6a according to the present invention and a power cutoff mechanism 9 provided in the AC line between the switch 2 and the power supply device 3 to the conventional example.

When the temperature abnormality control section 6a receives the abnormality detection signal from the temperature sensor 7, it sends a disconnection instruction signal to the power disconnection mechanism 9. Further, the power cutoff mechanism 9 has a function of cutting off the AC line supplied to the power supply device 3 upon receiving a cutoff instruction signal from the temperature abnormality control section 6a.

FIG. 2 is a block diagram illustrating the configuration of the power cutoff mechanism. As seen in FIG. 2, the power disconnection mechanism 9
are a fuse 91, a protective resistor 92, and a cut signal receiving circuit 93.
and a display section 94.

The fuse 91 has the function of relaying the AC line from the switch 2 to the power supply device 3, and the function of blowing itself when an overcurrent flows through the AC line. Replacement is easy if you use socket mounting.

The disconnection signal receiving circuit 93 has terminals (3), (
4) It has the function of shorting between terminals (1) and (2) when current flows between them. Further, the protective resistor 92 is a current limiting resistor for preventing excessive current from flowing into the circuit. It is assumed that this resistance value is selected to be a value that can blow the fuse 91 but does not damage the cut signal receiving circuit 93.

In FIG. 2, the temperature abnormality control section 6a
When the disconnection instruction signal is received from the disconnection signal receiving circuit 93, the disconnection signal receiving circuit 93
Terminals (1) and (2) are short-circuited, so an excessive current flows through the AC line via the protective resistor 92 and terminals (1) and (2). When an excessive current flows through the AC line, the fuse 91 blows out and the AC line to the power supply device 3 is cut off. As a result of this cutting, the display section 94 ceases to emit light. Note that the display section 94 emits light and displays when power is supplied to the AC line.

Further, FIG. 3 is a block diagram showing the circuit configuration of the temperature abnormality control section. As shown in the figure, when an abnormality detection signal from the temperature sensor 7 is input to the left terminal, the temperature abnormality control section 6a sends a disconnection instruction signal to the power disconnection mechanism 9 from the right terminal. .

Next, the operation of the electronic device shown in the embodiment shown in FIG. 1 when an abnormal temperature occurs will be explained.

[0029] When the cooling fan 4 of the electronic device 1a breaks down, the internal temperature rises. When a certain specified temperature is reached, the temperature sensor 7 detects an abnormal temperature of the device.

When the temperature abnormality control section 6a receives the abnormality detection signal, the power cutoff mechanism 9 sends out a cutoff instruction signal. Upon receiving the disconnection instruction signal, the power disconnection mechanism 9 disconnects the power supply device 3.
Disconnect the AC power supply line to the In this way, the AC power supply to the power supply device 3 is stopped, so the output of DC power is stopped.

[0031] Since the DC power supply to the DC output load 5, which is a heating element, is stopped, the internal temperature of the device stops rising, and the temperature eventually decreases, making it possible to control temperature abnormalities without manual intervention. . In addition to performing such automatic control, it is also possible to notify a maintenance person of the equipment of an abnormality by turning off the display section 94 that was lit during AC power supply.

Furthermore, if the temperature regulation value of the equipment is set below the absolute maximum temperature of the semiconductor elements, etc., the power will be cut off below this temperature, so there will be no damage to the entire equipment, and the circuit parts will not catch fire. Accidents like this are no longer possible.

[0033]

As described above, according to the present invention, when a temperature abnormality occurs in an electronic device incorporating a power supply device that does not have an on/off control terminal, a temperature abnormality control device is installed that cuts off the power supply to the power supply device. As a result, the effects shown in A to C below can be obtained.

[0034]B. When an abnormality occurs, there is no need for maintenance personnel to operate the system, making it easy to handle unmanned systems.

B. Since the absolute maximum temperature of elements such as semiconductors used in the device is never reached, damage to the entire device can be prevented.

Compared to damage to the entire device, destruction of the fuse used in the present invention is extremely minor in terms of cost.

C. Since extremely high temperatures are not reached, ignition of the medium used does not occur.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic device incorporating an embodiment of a temperature abnormality control device according to the present invention.

FIG. 2 is a block diagram showing a configuration of the power cutoff mechanism shown in the embodiment of FIG. 1;

FIG. 3 is a block diagram showing a circuit configuration of a temperature abnormality control section of the present invention.

FIG. 4 is a block diagram showing a configuration example of a conventional electronic device equipped with a temperature abnormality control device.

[Explanation of symbols]

1a Electronic equipment 2 Switch 3 Power supply device 4 Cooling fan 5 DC output load 6a　Temperature abnormality control section 7 Temperature sensor 8 AC code 9 Power disconnection mechanism 91 Fuse 92 Protective resistance 93 Cutting signal receiving circuit 94 Display section

Claims (1)

[Claims] [Claim 1] A temperature abnormality control device built into an electronic device incorporating a power supply device that does not have an on/off control terminal, which measures the temperature inside the device and sends an abnormality detection signal when the temperature reaches a specified value. a temperature sensor that outputs a temperature sensor, a temperature abnormality control unit that outputs a power cutoff instruction signal when receiving the above abnormality detection signal, and a power cutoff mechanism that stops power supply to the power supply device when the power cutoff instruction signal is received. A temperature abnormality control device characterized in that the power cutoff mechanism uses an overcurrent detection type fuse.