JP2007074872A - Power supply device and bathroom ventilation dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device that reduces the heat generation of a switching element by making variable the switching duty of the switching element for switching electric power. <P>SOLUTION: An AC/DC converter that converts AC electric power to DC electric power is provided with a switching element 2 that switches electric power to the AC/DC converter 1, and with a heat sink 3 as a cooling means in contact with this switching element 2 for radiating heat generated by the switching element. This heat generation by the switching element can be reduced by providing a thermistor 4 which is a temperature detection means for detecting the temperature of the switching element 2 between the switching element 2 and the cooling means 3, and a heat loss reduction means 5A that makes variable the switching duty of the switching element 2 according to temperature information of the temperature detection means 4. Accordingly, the power supply device can be obtained as reducible in heat generation of the switching element. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device that uses a semiconductor to convert AC power into DC power.

  Conventionally, this type of power supply device is known to use a cooling device using a cooling fan (see, for example, Patent Document 1).

  Hereinafter, the power supply apparatus will be described with reference to FIG.

As shown in the figure, the switch element 102 disposed on the cooling plate 101, the switch element control circuit 103 that controls the switch element 102, the temperature detecting means 104 disposed near the switch element 102, and the cooling plate 101 A cooling pump 105 for cooling the cooling fan 106, a cooling fan 106, and a cooling control circuit 107 for controlling the cooling capacity.
JP-A-7-245363

  In such a power supply device, the heat generation of the semiconductor element is not reduced, but the cooling is performed by the cooling device, and thus there is a problem in miniaturization and cost of the power supply device.

  The present invention solves the above-described problems, and an object thereof is to provide a power supply device that reduces heat generation of a semiconductor element by controlling power conversion efficiency to an optimum state.

  In order to achieve the above object, a power supply device of an invention is an AC / DC converter that converts AC power into DC power, a switch element that switches power provided in the AC / DC converter, and dissipates the switch element. An AC / DC power supply including a cooling unit includes a temperature detection unit that detects a temperature of the cooling unit, and a heat loss reduction unit that changes switching so as to reduce heat generation of the switch element from the temperature detected by the temperature detection unit. It is a thing.

  By this means, it is possible to obtain a power supply device that can efficiently switch the switch element and reduce heat generation.

  Another means is that the cooling means is a heat sink.

  By this means, a power supply device that can dissipate heat generated from the switch element at a relatively low cost can be obtained.

  Another means is that the temperature detection of the cooling means is a thermistor.

  By this means, a power supply device capable of detecting the temperature detection of the cooling means at a relatively low cost can be obtained.

  Another means is that the temperature detecting means is installed between the switch element and the cooling means.

  By this means, a power supply device capable of more accurately detecting the heat generation temperature of the switch element can be obtained.

  Another means is that the heat loss reducing means changes the switching duty.

  By this means, it is possible to obtain a power supply device that can reduce heat generation due to variations in characteristics of the switch elements.

  Another means is that the heat loss reducing means intermittently drives the switch element when the temperature of the cooling means exceeds a predetermined value.

  By this means, it is possible to obtain a power supply device that can prevent switching and prevent switching due to heat generation.

  As another means, the heat loss reducing means includes a feedforward control means for increasing or decreasing the duty in accordance with an input current of the switch element, and a feedback control means for controlling the temperature detection value to decrease. It is characterized by that.

  By this means, it is possible to obtain a power supply device that can perform switching efficiently according to the input current.

  The other means is that the heat loss reducing means is a second feedforward control means for increasing or decreasing the duty according to the output current of the switch element, and a feedback control means for controlling the temperature detection value to be lowered. It is characterized by having.

  By this means, it is possible to obtain a power supply device that can perform switching efficiently according to the output current.

  Another means is that the heat loss reducing means is a third feedforward control means for increasing or decreasing the duty according to the current and duty of the switch element and the voltage across the switch element, and temperature detection. A feedback control means for controlling the value to decrease is provided.

  By this means, it is possible to obtain a power supply device that can perform efficient switching according to the current flowing through the switch element and the terminal voltage.

  Another means is that the heat loss reducing means stops the switch element when the temperature of the cooling means exceeds a predetermined abnormality threshold.

  By this means, it is possible to obtain a power supply device that can prevent the switch element from being destroyed by heat generation.

  In addition, the other means is characterized by comprising a notifying means for notifying an abnormality when the temperature of the cooling means exceeds a predetermined abnormality threshold.

  By this means, it is possible to obtain a power supply device that can confirm that the switch element has stopped due to heat generation.

  Another means is that the notification means is light or sound.

  By this means, it is possible to obtain a power supply device that can easily confirm that the switch element has stopped due to heat generation.

  In addition, the other means uses a DC drive motor, and includes the power supply device according to any one of claims 1 to 12, and is characterized by performing 24-hour regular ventilation, circulation heating in the bathroom, and sauna operation. It is.

  By this means, the heat generated from the bathroom ventilation dryer control means can be reduced, and a bathroom ventilation dryer that operates without performing control means protection operation due to heat generation can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the switch element can be switched efficiently and the power supply device which can reduce heat_generation | fever of the switch element which is a semiconductor element can be provided.

  Further, it is possible to provide a power supply device that can dissipate heat generated from the switch element at a relatively low cost.

  Further, it is possible to provide a power supply device that can be configured to detect the temperature of the cooling means at a relatively low cost.

  Further, it is possible to provide a power supply device that can more accurately detect the heat generation temperature of the switch element.

  In addition, it is possible to provide a power supply device that can reduce heat generation due to variations in characteristics of switch elements.

  Further, it is possible to provide a power supply device that can prevent switching of the switch element due to heat generation and perform switching.

  Further, it is possible to provide a power supply device that can perform switching efficiently according to the input current.

  Further, it is possible to provide a power supply device that can perform switching efficiently according to the output current.

  In addition, it is possible to provide a power supply device that can perform efficient switching according to the current flowing through the switch element and the terminal voltage.

  Further, it is possible to provide a power supply device that can prevent the switch element from being destroyed by heat generation.

  Further, it is possible to provide a power supply device that can confirm that the switch element has stopped due to heat generation.

  Further, it is possible to obtain a power supply device that can easily confirm that the switch element has stopped due to heat generation.

  Further, it is possible to provide a bathroom ventilation dryer that reduces heat generation from the bathroom ventilation dryer control means and operates without performing control means protection operation due to heat generation.

  The invention according to claim 1 of the present invention includes an AC / DC converter that converts AC power into DC power, a switch element that switches power provided in the AC / DC converter, and a cooling means that radiates heat from the switch element. The AC / DC power supply includes temperature detecting means for detecting the temperature of the cooling means, and heat loss reducing means for changing switching so as to reduce heat generation of the switch element from the detected temperature of the temperature detecting means. There is an effect that the switch element can be efficiently switched and heat generation of the switch element can be reduced.

  Further, the invention according to claim 2 is such that the cooling means is a heat sink, and has an effect that heat generated from the switch element can be dissipated relatively inexpensively.

  According to the third aspect of the present invention, the temperature detection of the cooling means is a thermistor, and the temperature detection of the cooling means can be detected relatively inexpensively.

  The temperature detecting means is installed between the switch element and the cooling means, and has an effect that the heat generation temperature of the switch element can be detected more accurately.

  The invention according to claim 5 is characterized in that the heat loss reducing means changes the duty of switching and has the effect of reducing heat generation due to variations in characteristics of the switch elements.

  According to a sixth aspect of the present invention, the heat loss reducing means intermittently drives the switch element when the temperature of the cooling means exceeds a predetermined value, thereby preventing the switch element from being destroyed by heat generation and performing switching. It has the action.

  According to a seventh aspect of the present invention, the heat loss reducing means includes a feedforward control means for increasing or decreasing the duty according to the input current of the switch element, and a feedback control means for controlling the temperature detection value to be reduced. And has the effect of enabling efficient switching according to the input current.

  In the invention according to claim 8, the heat loss reducing means controls the second feedforward control means for increasing or decreasing the duty according to the output current of the switching element so that the temperature detection value decreases. It is provided with a feedback control means, and has an effect that switching can be performed efficiently according to the output current.

  The invention according to claim 9 is characterized in that the heat loss reducing means includes third feedforward control means for increasing or decreasing the duty according to the current flow and duty of the switch element and the voltage across the switch element. The feedback control means for controlling the temperature detection value to be lowered has an effect that the switching can be efficiently performed according to the current flowing through the switch element and the terminal voltage.

  In the invention according to claim 10, the heat loss reducing means stops the switch element when the temperature of the cooling means exceeds a predetermined abnormality threshold, and can prevent destruction of the switch element due to heat generation. Has a tingling effect.

  Further, the invention according to claim 11 is provided with notifying means for notifying abnormality when the temperature of the cooling means exceeds a predetermined abnormality threshold, and it is possible to confirm that the switch element has been stopped due to heat generation. Have.

  In the invention according to claim 12, the notifying means is light or sound, and has an effect that it can be easily confirmed that the switch element has stopped due to heat generation.

  The invention described in claim 13 includes the power supply device according to any one of claims 1 to 12, and is characterized by performing 24-hour continuous ventilation, circulation heating in the bathroom, and sauna operation, The heat generated from the bathroom ventilation dryer control means is reduced, and the operation can be performed without performing the control means protection operation due to the heat generation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 2, a switching element 2 that switches power to the AC / DC converter 1 and a cooling means 3 that uses the heat sink to contact the switching element 2 and dissipate the heat generated by the switching element 2. And a temperature detection means 4 using a thermistor for detecting the temperature of the switch element 2 is provided between the switch element 2 and the cooling means 3, and the temperature information of the temperature detection means 4 indicates that the switch element 2 is switched off. The thermal loss reducing means 5A for changing the timing of the voltage fall at both ends and the current rise timing when switching is ON and applying switching duty to the switch element 2 is provided.

  Although a heat sink is used as the cooling means 3, it may not be a heat sink as long as the heat generated from the switch element 2 can be efficiently dissipated.

  Although the thermistor is used as the temperature detecting means 4, it may not be a thermistor as long as it detects the heat generation of the switch element 2 and can extract the information as an electrical signal.

  The variable of the heat loss reducing means 5A may be changed manually using a variable resistor or automatically using a microcomputer or the like based on the information of the temperature detecting means 4.

  When the AC input is converted into the DC output by the above configuration, when the switching element 2 is switched with a duty (Duty *) determined in advance by the DC current, the switching element 2 may vary in manufacturing process or the AC / DC converter 1 The temperature Tc of the cooling means detected by the temperature detection means 4 by the switch element 2 according to the ambient temperature condition or the like is compared with a preset temperature Tc *, and when Tc> Tc *, the switching of the switch element 2 is lowered. As described above, the heat loss reducing means 5A provides duty so that the switching element 2 is switched at Duty−. In the case of Tc <Tc *, the heat loss reducing means 5A provides duty so that the switching element 2 is switched at Duty + so as to increase the switching of the switching element 2. When Tc≈Tc *, switching is continued with the current duty. By doing so, switching can be performed without damaging the switch element 2 due to heat generation at the time of switching due to variations in the switch element 2 or reducing the switching efficiency.

(Embodiment 2)
As shown in FIGS. 3 to 4, there is provided a heat loss reducing means 5 </ b> B that intermittently outputs a duty given to the switch element 2 when the temperature of the cooling means 3 exceeds a predetermined value.

  When Tc> Tc * with the above configuration, the heat loss reducing means 5B provides duty so that the switching element 2 is switched at Duty− so as to lower the switching of the switching element 2, but the heat loss reducing means When Tc> Tc * is continued even if the duty (min) duty set in 5B is applied to the switch element 2, the heat loss reducing means 5B intermittently applies the duty given to the switch element 2 in the state of Duty−. Output. By doing so, it is possible to prevent the switch element 2 from being destroyed by heat generation.

(Embodiment 3)
As shown in FIG. 5 to FIG. 6, the current value input to the switch element 2 is detected and compared with an input current value set in advance to reduce the heat generation of the switch element 2, and then to the heat loss reducing means 5 </ b> C. The heat generation information of the switch element 2 detected by the feedforward control means 6 and the temperature detection means 4 for transmitting the switching duty variable signal is compared with the heat generation value set in advance to reduce the heat generation of the switch element 2. The feedback control means 7 is provided for transmitting a switching duty variable signal to the heat loss reducing means 5C.

  The feedforward control means 6 only needs to compare a current value input to the switch element 2 with a preset current value and output a duty variable signal according to the difference. The voltage at both ends thereof is detected by using a microcomputer, and the current value is compared with a set value stored in the microcomputer using a microcomputer to generate a variable variable signal by the microcomputer.

  As the feedback control means 7, it is only necessary to compare the heat generation information of the switch element 2 detected by the temperature detection means 4 and the preset heat generation value information. For example, the heat generation converted into a voltage value by the temperature detection means 4. There is a method in which information is compared with a set value stored in a microcomputer using a microcomputer to generate a duty variable signal by the microcomputer.

  The current value (Iin) input to the switch element 2 detected by the feedforward control means 6 with the above configuration is compared with a preset input current value (Iin *). If Iin> Iin *, It is sent to the heat loss reducing means 5C so as to lower the switching duty, and when Iin <Iin *, the switching duty is raised. Further, the heating value (Swhh) of the switch element 2 detected by the temperature detecting means 4 is sent to the feedback control means 7 and compared with a preset heating value (Swhh *). Is sent to the heat loss reducing means 5C so as to lower the switching duty.

  Then, the heat loss reducing means 5C switches the switching element 2 so as to have an optimum switching duty based on two pieces of duty information determined from the force current value and the heat generation value. By doing so, efficient switching can be performed in accordance with the input current.

(Embodiment 4)
As shown in FIGS. 7 to 8, the current value output from the switch element 2 is detected, compared with an output current value set in advance to reduce the heat generation of the switch element 2, and sent to the heat loss reducing means 5 </ b> D. The second feedforward control means 8 for transmitting the switching duty variable signal and the heat generation information of the switch element 2 detected by the temperature detection means 4 and the heat generation value set in advance to reduce the heat generation of the switch element 2 are obtained. In comparison, a feedback control means 7 for transmitting a switching duty variable signal to the heat loss reducing means 5D is provided.

  With the above configuration, the current value (Iout) output from the switch element 2 detected by the second feedforward control means 8 is compared with the preset output current value (Iout *), and Iout> Iout * Is sent to the heat loss reducing means 5D so as to lower the switching duty, and if Iout <Iout *, the switching duty is raised. Further, the heating value (Swhh) of the switch element 2 detected by the temperature detecting means 4 is sent to the feedback control means 7 and compared with a preset heating value (Swhh *). Is sent to the heat loss reducing means 5D so as to reduce the switching duty. In the case of Swth <Swhh *, the switching duty is reduced.

  Then, the heat loss reducing means 5D switches the switch element 2 so as to have an optimum switching duty based on two pieces of duty information determined from the output current value and the heat generation value. By doing so, efficient switching can be performed in accordance with the output current.

(Embodiment 5)
As shown in FIGS. 9 to 10, the current value flowing through the switch element 2, the switching duty, the output power of the switch element 2 obtained by detecting the voltage across the switch element 2, The switch element detected by the third feedforward control means 9 and the temperature detection means 4 for transmitting a switching duty variable signal to the heat loss reduction means 5E in comparison with the preset output power value in order to reduce the heat generation. The feedback control means 7 is provided for comparing the heat generation information 2 and the heat generation value set in advance to reduce the heat generation of the switch element 2 and transmitting a switching duty variable signal to the heat loss reduction means 5E.

  When the power value (Pout) output from the switch element 2 detected by the third feedforward control means 9 with the above configuration is compared with a preset output power value (Pout *), Pout> Pout * Is sent to the heat loss reducing means 5E so as to lower the switching duty, and if Pout <Pout *, the switching duty is raised. Further, the heating value (Swhh) of the switch element 2 detected by the temperature detecting means 4 is sent to the feedback control means 7 and compared with a preset heating value (Swhh *). Is sent to the heat loss reducing means 5E so that the switching duty is reduced. In the case of Swth <Swhh *, the switching duty is lowered.

  Then, the heat loss reducing means 5E switches the switching element 2 so as to have an optimum switching duty based on two pieces of duty information determined from the output power value and the heat generation value. In this way, efficient switching can be performed in accordance with the output power.

(Embodiment 6)
As shown in FIG. 11, when the temperature (Swhh) of the cooling means 3 detected by the temperature detection means 4 exceeds a preset threshold value (Swhh *), the switching of the switch element 2 is stopped as an abnormality. The heat loss reducing means 5F is provided.

  When the switching element 2 is switched by the above configuration and the AC input is converted into the DC output, the temperature of the cooling means 3 detected by the temperature detecting means 4, that is, the heat generation of the switching element 2 is compared by the heat loss reducing means 5F. In the case of Swth <Swhh *, the heat loss reducing means 5F gives the switch element 2 a duty and continues switching. However, if Swth> Swhh *, the heat loss reducing means 5F gives the switch element 2 a duty. To stop. By doing so, it is possible to prevent destruction of the switch element due to heat generation.

(Embodiment 7)
As shown in FIG. 12, notification means for notifying abnormality by light or sound when the temperature (Swhh) of the cooling means 3 detected by the temperature detection means 4 exceeds a preset threshold value (Swhh *). 10 is connected to the heat loss reducing means 5G.

  With the above configuration, when Swth> Swhh *, the heat loss reducing unit 5G stops the duty output to the switch element 2, stops switching of the switch element 2, and transmits abnormality information to the notification unit 10. And the alerting | reporting means 10 which received abnormality information alert | reports abnormality by light or a sound. By doing so, it can be easily confirmed that the switch element has stopped due to heat generation.

(Embodiment 8)
As shown in FIG. 13, a DC drive motor 13 that rotates a fan 12 for blowing air during at least one operation of 24-hour continuous ventilation in the bathroom ventilation dryer 11, circulation heating in the bathroom, and sauna operation; A power supply device 14 for driving the DC drive motor 13 is provided in the bathroom ventilation dryer main body control means 15.

  Although the power supply device 14 is provided in the bathroom ventilation dryer main body control means 15, it may not be provided in the bathroom ventilation dryer main body control means 15 as long as it can be driven by a control signal from the bathroom ventilation dryer main body control means 15.

  The bathroom dryer main body control means 15 includes a heater circuit necessary for the bathroom dryer main body, a drive circuit for operating an actuator such as an air path switching damper, a fan motor and the like, a circuit portion for receiving information signals such as bathroom temperature, bathroom drying It is a control means which comprises a remote control unit for stopping the operation of the machine and a microcomputer, and operates the actuator of the bathroom dryer in response to an operation signal from the remote control unit. For example, if the signal from the remote control unit is a 24-hour constant ventilation operation signal, the fan motor and actuator that perform ventilation, the fan motor and actuator that performs circulation in the bathroom in the bathroom circulation heating, and the sauna In operation, the fan motor that performs sauna operation and its actuator operate.

  The number of the fan 12, the DC drive motor 13, and the power supply device 14 is one for the explanation of the configuration, but a plurality of them may be configured.

  With the above configuration, when performing 24-hour continuous ventilation, circulation heating in the bathroom, sauna operation, etc., the power supply device 14 is driven by the operation signal from the bathroom dryer main body control means 15, the DC drive motor 13 rotates, and the fan However, since the switching duty of the switch element is varied according to the heat generation of the switch element in the power supply device 14 at this time, the heat generation of the power supply device 14 is reduced. You can drive. By doing so, it is possible to operate without performing the power supply device due to heat generation of the power supply device or the control means protection operation of the bathroom dryer main body control means.

  Heat loss of the switch element can be easily reduced by using the heat loss reducing means attached to the power supply device. By attaching the heat loss reducing means to the control means for driving the switch element, the direct current with large heat loss can be changed to alternating current. The present invention can also be applied to a DC / AC converter to be converted, for example, a compressor driving application of an air conditioner.

The block diagram which shows the structure of the power supply device of Embodiment 1 of this invention. Flow chart showing duty variable operation of the power supply device The block diagram which shows the structure of the power supply device of Embodiment 2 of this invention. Flow chart showing duty variable operation of the power supply device The block diagram which shows the structure of the power supply device of Embodiment 3 of this invention. Flow chart showing duty variable operation of the power supply device The block diagram which shows the structure of the power supply device of Embodiment 4 of this invention. Flow chart showing duty variable operation of the power supply device The block diagram which shows the structure of the power supply device of Embodiment 5 of this invention. Flow chart showing duty variable operation of the power supply device The block diagram which shows the structure of the power supply device of Embodiment 6 of this invention. The block diagram which shows the structure of the power supply device of Embodiment 7 of this invention. The block diagram which shows the structure of the bathroom ventilation dryer of Embodiment 8 of this invention. The figure which shows the structure of the conventional power supply device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC / DC converter 2 Switch element 3 Cooling means 4 Temperature detection means 5A Thermal loss reduction means 5B Thermal loss reduction means 5C Thermal loss reduction means 5D Thermal loss reduction means 5E Thermal loss reduction means 5F Thermal loss reduction means 5G Thermal loss reduction means 6 Feedforward Control Unit 7 Feedback Control Unit 8 Second Feedforward Control Unit 9 Third Feedforward Control Unit 10 Notification Unit 11 Bathroom Ventilation Dryer 12 Fan 13 DC Drive Motor 14 Power Supply Device 15 Bathroom Dryer Body Control Unit

Claims (13)

In an AC / DC power supply comprising an AC / DC converter for converting AC power to DC power, a switch element for switching the power provided in the AC / DC converter, and a cooling means for radiating heat from the switch element, the cooling means A power supply apparatus comprising: temperature detection means for detecting temperature; and heat loss reduction means for changing switching so as to reduce heat generation of the switch element from the temperature detected by the temperature detection means. The power supply apparatus according to claim 1, wherein the cooling means is a heat sink. 2. The power supply device according to claim 1, wherein the temperature detection of the cooling means is a thermistor. 2. The power supply device according to claim 1, wherein the temperature detecting means is installed between the switch element and the cooling means. 2. The power supply apparatus according to claim 1, wherein the heat loss reducing means changes a switching duty. 2. The power supply device according to claim 1, wherein the heat loss reducing means intermittently drives the switch element when the temperature of the cooling means exceeds a predetermined value. The heat loss reducing means includes a feedforward control means for increasing or decreasing the duty according to an input current of the switch element, and a feedback control means for controlling the temperature detection value to decrease. The power supply device according to 1. The heat loss reducing means includes a second feedforward control means for increasing or decreasing the duty according to an output current of the switch element, and a feedback control means for controlling the temperature detection value to decrease. The power supply device according to claim 1. The heat loss reducing means controls the third feedforward control means for increasing or decreasing the duty according to the flow current and duty of the switch element and the voltage across the switch element so that the temperature detection value decreases. The power supply apparatus according to claim 1, further comprising feedback control means for performing the operation. 2. The power supply apparatus according to claim 1, wherein the heat loss reducing means stops the switch element when the temperature of the cooling means exceeds a predetermined abnormality threshold value. The power supply apparatus according to claim 10, further comprising an informing unit for informing an abnormality when the temperature of the cooling unit exceeds a predetermined abnormality threshold. The power supply apparatus according to claim 11, wherein the notification means is light or sound. A bathroom ventilation drying using a DC drive motor, comprising the power supply device according to any one of claims 1 to 12, and performing at least one of 24-hour continuous ventilation, circulation heating in the bathroom, and sauna operation. Machine.

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