JPH054582U - Air conditioner inverter device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an inverter device of an air conditioner for protecting an element in an inverter part and a power circuit part driving the inverter part when the inverter is operated in accordance with the operation of the air conditioner. . [Composition] An inverter temperature detector 9 for detecting the temperature of the inverter unit 4, an inverter unit 4 for providing an air conditioner ambient temperature detector 11 for detecting the ambient temperature of the air conditioner, and a cooling / ventilation for the power circuit unit 6, respectively. Install fan 10. [Effect] In addition to the temperature detection of the inverter unit, the ambient temperature of the air conditioner, which is mainly used for operation control of the air conditioner, is diverted according to the operation demand of the inverter, and even when the temperature is high, the inverter unit is also operated. By controlling the cooling / ventilation fan regardless of the temperature, it is possible to prevent deterioration and damage of the elements in the inverter and power circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inverter device for an air conditioner that controls the operation of a cooling / ventilation fan provided in the inverter part and the power circuit part by detecting the ambient temperature of the air conditioner and the temperature of the inverter part. is there.

[0002]

[Prior Art]

 FIG. 5 is a block diagram of an inverter device of a conventional air conditioner shown in, for example, Japanese Utility Model Laid-Open No. 2-9745, and FIGS. 6 and 7 are flowcharts showing the operation of the control unit. From FIG. 5, 2 is a converter unit for converting the commercial AC power supply 1 into DC, 3 is a smoothing capacitor for smoothing it, 4 is an inverter unit (power transistor) for converting the smoothed DC into AC of variable voltage / frequency, 5 Is a compressor of the air conditioner connected to the inverter section, 6 is a power circuit section (base amplifier section) that drives the inverter section according to a command from the control circuit section 7, and 9 is a variable resistance temperature type whose resistance value decreases due to temperature rise. A temperature detector that detects the temperature of the inverter unit by a sensor, 10 is a cooling / ventilation fan that cools the surroundings of the inverter unit and the power circuit unit, and 7 is the temperature that is detected, and the operation and cooling of the air conditioner / inverter A control circuit unit for controlling the ventilation fan, and 8 are microcomputers for actually calculating and processing in the control circuit unit.

Next, the operation will be described. From Fig. 5, Fig. 6, and Fig. 7, if there is a request for the inverter control mode (step 17) along with the normal control of the air conditioner (step 16), first the operation command (step 18) and stop (step 27). , Determine the process during operation. First, at the time of an operation command (step 18), the microcomputer 8 in the control circuit section 7 detects the temperature of the inverter section by the temperature detector 9 (step 19), and the detected temperature (Xa ) Judge whether the temperature is above the preset temperature (Y1) ℃ (step 20), and if it is higher than this, operate the cooling / ventilation fan (step 21) and set the temperature below (Y1-a) ℃. Continue to drive until (step 22). When the temperature falls below the set temperature (Y1-a) ° C, the cooling / ventilation fan is stopped (step 24) and the inverter starts operating (step 26). Next, when stopped (step 27), it is first judged whether the cooling / ventilation fan is in operation (step 28). If it is in operation, the temperature of the inverter section is detected by the temperature detector 9 (step 29). ), It is determined whether the temperature is below the set temperature (Y2-b) ° C (step 30), and the cooling / ventilation fan continues to operate until it falls below that temperature, but if it falls below that temperature, the cooling / ventilation fan stops. (Step 31). Furthermore, as the process during operation, first, the temperature of the inverter is detected by the temperature detector 9 (step 32) and it is judged whether it is the set temperature (Y2) ℃ or more (step 33). Operate the fan (step 34) and continue the operation until the temperature falls below the set temperature (Y2-b) ° C (step 36). If the temperature is below the set temperature (Y2) ° C, it is judged whether the cooling / ventilation fan is in operation (step 35). If it is in operation, go to step 36 above. Otherwise, turn on the cooling / ventilation fan. Stop (step 39).

[0004]

[Problems to be solved by the device]

 Since the conventional air conditioner inverter device is configured as described above, only the inverter temperature is detected and the cooling / ventilation fan operation is controlled in response to the inverter operation request. When the ambient temperature of the air conditioner is high, the ambient temperature of the power circuit is high even if the temperature of the inverter is low.Therefore, when the inverter is operated, the temperature rises quickly and the deterioration and damage of the elements are accelerated. There was a problem.

The present invention has been made in order to solve the above-mentioned problems, and in addition to the temperature detection of the inverter unit in accordance with the operation request of the inverter, the cooling / ventilation is performed by the ambient temperature of the air conditioner. An object of the present invention is to obtain an inverter device for an air conditioner that protects the elements in the inverter section and the power circuit section by controlling the fan.

[0006]

[Means for Solving the Problems]

 The air conditioner inverter device according to the present invention uses the ambient temperature of the air conditioner mainly used for the operation control of the air conditioner in addition to the temperature detection of the inverter part in accordance with the operation request of the inverter, Even when the temperature is high, a means for controlling the cooling / ventilation fan is provided regardless of the temperature of the inverter section.

[0007]

[Action]

 The air conditioner inverter device according to the present invention uses the ambient temperature of the air conditioner, which is mainly used for the operation control of the air conditioner, in addition to the temperature detection of the inverter part in response to the operation request of the inverter. Even when the temperature is high, the cooling / ventilation fan can be controlled regardless of the temperature of the inverter section, and the deterioration and damage of the elements in the inverter section and the power circuit section can be prevented.

[0008]

【Example】

 Example 1. FIG. 1 is a schematic diagram of an inverter device for an air conditioner according to the present invention, FIG. 2 is a temperature detection circuit in a control circuit section, and FIGS. 4 and 5 are flowcharts showing this operation. In the figure, the same reference numerals as those of the conventional device indicate the same or corresponding parts. With the operation of the inverter, the cooling / ventilation fan is controlled by the ambient temperature of the inverter and the air conditioner.

Next, the above-described embodiment will be described. In the normal control of the air conditioner, the ambient temperature of the air conditioner is detected (Xb) ° C by the air conditioner ambient temperature detector 11 (step 16), and if there is a request for the inverter control mode (step 16). 17) First, the operation command (step 18), stop (step 27), and processing during operation are judged. First, at the time of an operation command (step 18), the temperature of the inverter section in the control circuit section 7 is detected by the inverter section temperature detector 9 (step 19), and the detected temperature (Xa) ° C detected is preset. It is judged whether or not it is above the set temperature (Y1) ℃ (step 20), and if it is above that, the cooling / ventilation fan is operated (step 21), and the operation is continued until it becomes below the set temperature (Y1-a) ℃. (Step 22). When the temperature is below the set temperature (Y1-a) ℃ or below the set temperature (Y1) ℃, if the ambient temperature (Xb) ℃ of the air conditioner is above the set temperature (Y3) ℃ (Step 23) The ventilation fan is operated (step 24), and if it is less than that, it is stopped (step 25) and the operation of the inverter is started (step 26). Next, when stopped (step 27), it is first judged whether the cooling / ventilation fan is in operation (step 28). If it is in operation, the inverter temperature is detected by the inverter temperature detector 9. (Step 29), it is judged whether it is below the set temperature (Y2-b) ℃ (Step 30), and the cooling / ventilation fan continues to operate until it becomes below that temperature. The fan stops (step 31). Further, as the process during operation, first, the temperature of the inverter section is detected by the inverter section temperature detector 9 (step 32), it is judged whether or not it is the set temperature (Y2) ° C or higher (step 33), and if it is higher than that, cooling is performed. • Operate the ventilation fan (step 34) and continue the operation until the temperature falls below the set temperature (Y2-b) ° C (step 36). If the temperature is below the set temperature (Y2) ° C, it is judged whether the cooling / ventilation fan is in operation (step 35). If it is in operation, go to step 36 above and stop or set the temperature (Y2-b). When the ambient temperature (Xb) ℃ of the air conditioner is higher than the set temperature (Y3) ℃ when the temperature is below ℃ (Step 37), the cooling / ventilation fan is operated (Step 39). (Step 38). In FIG. 2, as the temperature detecting method, the inverter temperature detector 9 and the air conditioner ambient temperature detector 11 are taken into the microcomputer 8 via the connector 15, the capacitor 14 and the resistor 12 in the control circuit unit 7. I'm out.

In the above example, the cooling / recirculation fan is controlled according to the ambient temperature of the air conditioner and the temperature of the inverter unit. However, the ambient temperature of the air conditioner is changed to the representative point ( It is also possible to control the cooling / ventilation fan by detecting the temperature at the highest point.

[0011]

[Effect of the device]

 As described above, according to the present invention, in response to the operation request of the inverter, in addition to the temperature detection of the inverter unit, the ambient temperature of the air conditioner mainly used for the operation control of the air conditioner is diverted and the temperature is changed. Even when the temperature is high, the cooling / ventilation fan can be controlled regardless of the temperature of the inverter section, and deterioration and damage of the elements in the inverter section and the power circuit section can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an inverter device of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a temperature detection circuit in a control circuit unit according to an embodiment of the present invention.

FIG. 3 is a flowchart showing an operation according to an embodiment of the present invention.

FIG. 4 is a continuation of the flowchart of FIG.

FIG. 5 is a schematic diagram of an inverter device of a conventional air conditioner.

FIG. 6 is a flowchart showing an operation of a control circuit in an inverter device of a conventional air conditioner.

FIG. 7 is a continuation of the flowchart of FIG.

[Explanation of symbols]

 1 Commercial AC power supply 2 Converter section 3 Smoothing capacitor 4 Inverter section 5 Load 6 Power circuit section 7 Control circuit section 8 Microcomputer 9 Inverter section temperature detector 10 Cooling / ventilation fan 11 Air conditioner ambient temperature detector

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02M 7/48 Z 9181-5H

Claims (1)

[Claims for utility model registration] 1. A converter unit for converting an input AC into a DC, a smoothing capacitor for smoothing the same, and an inverter unit for converting the smoothed DC into an AC of a variable voltage / frequency.
In an air conditioner equipped with an inverter that includes a power circuit unit that controls it and a control circuit unit that combines the control of the inverter unit and the control of the air conditioner, there is a request to operate the inverter along with the operation of the air conditioner. In this case, the first temperature detecting means for detecting the temperature of the inverter section is mainly used to operate the cooling / ventilating fan provided in the inverter section and the power circuit section if the temperature is equal to or higher than the first set temperature. By the second temperature detecting means used for controlling the operation of the air conditioner and detecting the ambient temperature of the air conditioner, if the temperature is equal to or higher than the second set temperature, the temperature of the first temperature detecting means is the first set temperature. An inverter device for an air conditioner, which is provided with means for operating a cooling / ventilation fan even in the following cases.