JPH054220U - Air conditioner power reset means - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to be able to promptly reset the control circuit when the power is turned off in an air conditioner that produces the control circuit power from the DC part of the inverter. [Structure] AC power failure detecting means, timer counting means for counting the power failure time, and means for resetting the control circuit when the timer count value exceeds a certain time. [Effects] According to the present invention, the operation can be continued without being stopped due to an instantaneous power failure or the like, and when the operation is to be stopped, the state is reset, and the setting is cleared, the power is stopped for a short time. Since it can be done only by itself, there is an effect that the clearing of the set state and the reset work of the abnormal state can be performed promptly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply resetting means for an air conditioner which uses an inverter and generates a control circuit power supply from a DC voltage of the inverter by a DC-DC converter.

[0002]

[Prior Art]

 FIG. 2 is a block diagram of an example of a power supply device for a conventional air conditioner disclosed in, for example, Japanese Utility Model Publication No. 64-54783. In FIG. 2, 1 is an AC power supply, 2 is a converter that converts this AC power supply into a direct current, 3 is a capacitor that smoothes the direct current, and 4 is that the smoothed direct current is converted into an alternating current of an arbitrary frequency and voltage. An inverter, 5 is a compressor driven by the alternating current, and 6 is a DC-DC converter for producing a low voltage direct current from the direct current and supplying a direct current power source to a control circuit. Reference numeral 7 is a control circuit of the air conditioner.

Next, the operation will be described. When the AC power supply 1 is energized, it is rectified into a direct current by the converter 2 and further smoothed by the capacitor 3 to become a substantially constant direct current. The inverter 4 switches the direct current to generate alternating current having an arbitrary frequency and voltage. The DC-DC converter 6 generates a low-voltage direct current required for the control circuit 7 of the air conditioner from the direct current and supplies it.

[0004]

[Problems to be solved by the device]

 Since the conventional inverter air conditioner is configured as described above, even if the power is turned off when the inverter is stopped, the DC-DC converter converts the direct current stored in the large-capacity capacitor of the inverter main circuit into the control circuit power supply. The control circuit keeps the previous state for a long time in order to supply. Therefore, when resetting an abnormal state or clearing the set contents by power supply reset, it is necessary to turn off the power supply for a long time and wait, and there is a problem that work cannot be performed promptly.

The present invention has been made to solve the above problems, and an object thereof is to be able to promptly reset the control circuit when the power is turned off in an air conditioner that produces the control circuit power from the direct current part of the inverter. As

[0006]

[Means for Solving the Problems]

 In this invention, a means for detecting a power failure of the AC power supply is provided, and the duration of the power failure is judged, and the control circuit is reset when the power failure occurs for a certain time or longer.

[0007]

[Action]

 In this invention, resetting is not performed after a power failure for a certain period of time, so the operation can be continued even if the power supply is momentarily interrupted. On the other hand, when clearing settings, etc. Since it can be done simply by turning off the power, work can be done quickly.

[0008]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an AC power source, 2 is a converter that converts this AC power source into DC, 3 is a capacitor that smoothes the DC, and 4 is an inverter that converts the smoothed DC into an AC of an arbitrary frequency and voltage. A barter, 5 is a compressor driven by the alternating current, 6 is a DC-DC converter for producing a low voltage direct current from the direct current and supplying direct current power to a control circuit, 7 is a control section for controlling an air conditioner, 8 Is a power failure detection unit that detects the turning off of the AC power supply, 9 is a timer unit that counts the power failure time detected by the power failure detection unit, and 10 is the control unit if the count time of the timer unit is a certain value or more. It is a reset unit for resetting.

Next, the operation will be described. When the AC power supply 1 is energized, it is rectified to DC by the converter 2 and further smoothed by the capacitor 3 to become DC with a substantially constant voltage. The inverter 4 switches the direct current to generate alternating current having an arbitrary frequency and voltage. The DC-DC converter 6 produces a low-voltage direct current required for the control unit 7 from the direct current and supplies it. Next, when the AC power supply 1 fails, the DC-DC converter 6 uses the electric charge charged in the capacitor 3 as a power supply source to generate a power supply for the control unit, and the control unit continues to operate. At the same time, the power failure detection unit 8 detects a power failure and outputs a power failure signal. The timer unit 9 detects the power failure signal and counts the timer. The reset unit 10 detects the count of the timer unit 9. First, when the count value is equal to or less than a certain value and the power source 1 recovers power, the reset unit 10 does not output a reset signal to the control unit 7, and the control unit 7 continuously operates as it is. Next, when the count value exceeds a certain value, the reset unit 10 outputs a reset signal to the control unit 7 to reset the control unit 7. After that, when the AC power supply 1 is turned on again, the power failure detection unit 8 turns off the power failure signal, clears the count value of the timer 9, and the reset unit 10 turns off the reset signal and the control unit 7 returns to the initial state. Restart from.

[0010]

[Effect of the device]

 As described above, according to the present invention, it is possible to continue the operation without stopping in the event of an instantaneous power failure, etc. In addition, when it is desired to stop the operation, reset the status, or clear the setting, the power supply for a short time. Since it is possible only by stopping the operation, clearing the set status and resetting the abnormal status can be done promptly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a control system of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a control system of a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Converter 3 Capacitor 4 Inverter 5 Compressor 6 DC-DC converter 7 Control part 8 Blackout detection means 9 Timer counting means 10 Reset means

Claims (1)

[Claims for utility model registration] [Claim 1] It has a refrigeration cycle consisting of a compressor, a condenser, an expansion valve, and a cooler, and converts the AC power supply into DC and converts it again into an arbitrary frequency and voltage. In an air conditioner that drives the compressor and steps down the direct current with a DC-DC converter to use as a direct current power source for a control circuit,
A power resetting means for an air conditioner, comprising: an AC power failure detecting means, a timer counting means for counting a power failure time, and a resetting means for resetting a control circuit when the timer count value exceeds a certain time.