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air conditioner

A technology for air conditioners and outdoor units, which is applied in mechanical equipment, space heating and ventilation, heating methods, etc., and can solve problems such as voltage drop and contact cut-off

Active Publication Date: 2021-03-26
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned prior art, when the voltage applied to the relay coil is a holding voltage, when the voltage of the AC power source drops due to, for example, a momentary power failure, the voltage applied to the relay coil also drops correspondingly. Therefore the contact will break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] figure 1 It is a figure which shows the structure of the air conditioner 1 which concerns on Embodiment 1. Such as figure 1 As shown, the air conditioner 1 has an indoor unit 2, an outdoor unit 3, a relay circuit 4 including a contact 4a and a relay coil 4b, a first transistor 5 connected to the relay circuit 4, a resistor 6 connected to the relay circuit 4, and The second transistor 7 connected to the resistor 6.

[0019] The indoor unit 2 has a control unit 21, and the control unit 21 applies a first voltage or a second voltage to the relay coil 4b, the first voltage is equal to or higher than the operating voltage for turning on the contact 4a, the second voltage is lower than the operating voltage, and It is equal to or higher than a holding voltage for keeping the contact 4a in a closed state. The first voltage and the second voltage are DC voltages. The control unit 21 has a first control port 21A connected to the first transistor 5 and a second control port 2...

Embodiment approach 2

[0054] Figure 6 It is a figure which shows the structure of 1 A of air conditioners concerning Embodiment 2. Compared Figure 6 and figure 1 It is clear that the air conditioner 1A includes an indoor unit 2A including a monitoring unit 24 for monitoring the voltage of the AC power supply 10 instead of the indoor unit 2 . The monitoring unit 24 monitors the voltage of the AC power supply 10 by, for example, converting the AC power from the AC power supply 10 into DC power and dividing the voltage by resistors.

[0055] The indoor unit 2A has a control unit 21C instead of the control unit 21 included in the indoor unit 2 . The control unit 21C has a first control port 21A and a second control port 21B. The air conditioner 1A further includes the outdoor unit 3 , the relay circuit 4 , the first transistor 5 , the resistor 6 , and the second transistor 7 that the air conditioner 1 according to Embodiment 1 has. The control unit 21C applies the first voltage to the relay coil...

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PUM

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Abstract

The air conditioner (1) has: an outdoor unit (3); a relay circuit (4) having contacts (4a) and a relay coil (4b); A second voltage equal to or higher than the holding voltage at the operating voltage is applied to the relay coil (4b). One end (4p) of the two ends of the contact point (4a) is connected to the AC power supply (10), and the other end (4q) of the two ends of the contact point (4a) is connected to the outdoor unit (3) . One end (4x) of the two ends of the relay coil (4b) is connected to a power source (11) for driving the relay circuit (4). The control unit (21) applies the first voltage to the relay coil (4b) when the contact (4a) is turned on, applies the second voltage to the relay coil (4b) after the contact (4a) is turned on, and uses The first voltage is applied to the relay coil (4b) at a predetermined constant cycle.

Description

technical field [0001] The present invention relates to an air conditioner for air conditioning. Background technique [0002] In electrical products, relay circuits are used to drive other circuits. Also in an air conditioner, a relay circuit is used to switch between a state in which electric power is supplied to the outdoor unit and a state in which electric power is not supplied to the outdoor unit. In the past, in order to drive the relay circuit with low power consumption and suppress the temperature rise of the relay circuit, it was proposed to apply a DC voltage higher than the operating voltage to the relay coil at the beginning of the contact, and apply a low voltage to the relay coil after a certain period of time. The technology of DC voltage above the operating voltage and above the holding voltage (for example, refer to Patent Document 1). In addition, a technique has been proposed that does not disconnect the contacts even if the actuator is driven and the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/32F24F11/88F24F11/89
CPCF24F11/37F24F11/46F24F11/88H01H47/002H01H47/10H01H47/32H01H2047/006H01H47/04H01H2047/008
Inventor 三上信弘
Owner MITSUBISHI ELECTRIC CORP