JPH04120553U - Air conditioner control device - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a heat pump air conditioner with a built-in semiconductor heater, to suppress the increase in rush current when the semiconductor heater is energized, and to prevent the total current rush from exceeding the limit current value of the overload protection device. The purpose of the present invention is to provide a control device for an air conditioner. [Configuration] Multiple semiconductor heaters are arranged in the air guide path, and the
After energizing the first semiconductor heater, the second semiconductor heater is energized for a predetermined time, and if the total current including the compressor operating current exceeds a preset limit value during this period, the compressor operating frequency is reduced. At the same time, the rotational speed of the indoor blower is lowered to suppress an increase in the rush current of the semiconductor heater, so that the overall current surge does not exceed the limit current value of the overload protection device.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a heat pump air conditioner with a built-in semiconductor heater. is a control that prevents a sudden increase in the total input current when starting heating operation and suppresses the operation of protective functions. It is related to the device.

0002

[Conventional technology]

Conventionally, when operating a heat pump air conditioner for heating, there is a It takes time for the indoor heat exchanger to warm up, especially when the indoor or outdoor temperature is low. The longer the time, the longer the period, and during that time, cold air circulates indoors, creating a chilly condition. Was. For this reason, a timer installed in the control unit gradually increases the operating frequency of the compressor. Accelerate the start-up of the indoor heat exchanger and place a semiconductor heater in the air guide path of the indoor unit However, a method is used to heat the air flowing through the air guide by turning on electricity at the same time as heating operation starts. However, in general, semiconductor heaters do not reach high temperatures when energized, and do not allow inflowing air to reach a high temperature. It took a long time to reach the heating temperature. There is a PTC semiconductor heater as a heater that starts up quickly, but this heater is The current changes greatly from the start until it stabilizes, and the current changes depending on the circulating wind speed. During this time, the inrush current of the PTC semiconductor heater is adjusted as shown in Figure 6. The total current consumption of the air conditioner exceeds the power outlet capacity or overload relay capacity. If the temperature exceeds the limit, divide the PTC semiconductor heater into two and wait until the first heater stabilizes. Either shift the start of energization so that the second heater is energized, or change the operating frequency of the compressor. It is necessary to take measures such as lowering the temperature in advance and operating the compressor at low capacity until it stabilizes. The heating was even slower and the heating was not comfortable.

0003

[Problem that the idea aims to solve]

This invention was devised in view of the above-mentioned conventional problems. The overload condition caused by the inrush current of the heater can be reduced by low capacity operation of the compressor and circulating indoor air. By lowering the wind speed, the operation of the overload protection device is suppressed, and the semiconductor heater By increasing the operating frequency of the compressor in stages as the inrush current decreases, We provide air conditioner control devices that accelerate temperature rise and create comfortable heating conditions. The purpose is to try.

0004

[Means to solve the problem]

In order to achieve the above purpose, the first semiconductor heater is energized and the rush current is stabilized. After lowering the rotation speed of the blower, the second semiconductor heater is energized to ensure that the total current is too high. The current was controlled so as not to exceed the limit current value of the load protection device.

[0005]

[Effect]

According to the above configuration, the first heater enters a stable state and energizes the second heater. In the meantime, lower the rotation speed of the indoor fan that circulates indoor air to make the first heater safer. Overload protection is achieved by lowering the peak value due to constant current and second heater rush current. The operation of the protection device is suppressed, and the blowout temperature rises due to the decrease in the inrush current of the semiconductor heater. This will speed up the heating process and create comfortable heating conditions.

[0006]

【Example】

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 shows a partially omitted side cross-section of an indoor unit incorporating a plurality of semiconductor heaters 1 of the present invention. In the figure, indoor air is sucked in through the suction port 2 on the front of the indoor unit's housing, and is compressed and heated. In the process of passing through the indoor heat exchanger 3 through which the refrigerant gas is flowing, heat is exchanged and the gas is warmed. The air is further heated by the semiconductor heater 1 disposed in the air guide path 4, and the air is blown into the room. The cycle of hot air being blown into the room from the air outlet 6 by the machine 5 is repeated. This is used to heat the room. Immediately after the start of operation, the temperature of the refrigerant gas flowing through the indoor heat exchanger 3 is low and almost Since the semiconductor heater 1 is used for heating, the semiconductor heater 1 has a fast rise time. A new PTC semiconductor heater is used.

[0007] FIG. 2 is a block diagram showing the configuration of the present invention, in which the control section 7 has a setting input circuit 8. , indoor temperature settings, heating operation on/off timer time settings, and air volume of the indoor fan 5 etc. and the preset total current limit value are input, and the control unit 7's menu is inputted. room temperature detection means for detecting the room temperature by the room temperature sensor 10; An input device that changes the operating frequency of the compressor 11 in accordance with changes in the internal temperature and controls the compression force. a converter control circuit 12; and an energization control circuit 13 that controls energization of the plurality of semiconductor heaters 1; , a blower control circuit 16 that controls the operation of the indoor blower 5, a semiconductor heater 1, and a compressor. The input current detection circuit 14 detects the total current of 11, and the semiconductor heater 1 is energized and The operation of the indoor blower 5 and the compressor 11 are controlled. The limit value of the total current is determined by calculating the contract current from the peak value after the rush of multiple semiconductor heaters 1. set within a range that does not exceed the current value or the operating current value of the overcurrent relay.

[0008] When the heating operation starts, the control unit starts the operation of the compressor 11 and changes the operating frequency of the compressor 11. Increase the number in stages at a certain rate (for example, 0.4 Sec/Hz) and gradually introduce warm air into the room. Speech out. If it is necessary to blow out high-temperature air in this state, the control unit 7 operates the compressor 11. The frequency is lowered to a preset range and the inverter control circuit 12 turns on the compressor 11. The power current is lowered, the first semiconductor heater A is energized, and after a certain period of time, the second semiconductor heater A is turned on. The heater B is energized to warm the indoor air flowing through the air guide path 4 and blow it into the room. At this time, the total current is detected by the input current detection circuit 14 and set in the memory 9 in advance. If the set limit value is not exceeded, heating operation continues and the preset room temperature is When the internal temperature is reached, the semiconductor heater 1 is turned off, the operating frequency of the compressor 11 is increased, and the room temperature is set. Shifts to controlled operation by sensor 10. If the total current is due to the breakthrough current of the first semiconductor heater A or the second semiconductor heater B, When the limit value is exceeded, the control unit 7 causes the blower control circuit 16 to control the rotation of the indoor blower 5. From the wind speed-power characteristics of semiconductor heater 1, as shown in Figure 3, , by lowering the input current value of the semiconductor heater 1 to reduce the surge current when the semiconductor heater 1 is energized. Suppresses the increase in total current and controls it so that it does not exceed the limit value (protection operating current). Figure 4 shows the heater A current, heater B current, compressor current and total The hatched part in the figure shows the change in the combined current over time, and the hatched part shows the change in the rotation speed of the indoor fan 5. This indicates that the input current value of the semiconductor heater 1 has decreased, and the input current value of the second semiconductor heater 1 has decreased. Even when heater B is energized, the limit value (protection operating current) is not exceeded.

[0009] Figure 5 is a flowchart showing the details of this invention. If it does not rise, it is determined that the operating conditions for semiconductor heater 1 have been reached (21), and the compression is performed. The operating frequency of heater 11 is lowered by a predetermined frequency range (22), and the first semiconductor heater A is power (23), simultaneously starts timer 15 (60Sec) (24), and after a predetermined time elapses. (25), and energize the second semiconductor heater B (26). In this state, the total current is detected by the input current detection circuit 14 and the limit is set in advance. value (e.g. 19A) (27) and if the total current does not exceed the limit value, then The heating operation continues (28), and if the limit value is exceeded, the rotation speed of the indoor fan 5 is changed. (29), suppresses the increase in the input current of semiconductor heater 1, and in this state the total current increases. If the limit value is not exceeded (30), heating operation continues (28), and if the limit value is exceeded, the heating operation continues (28). The semiconductor heater 1 is turned off (31), and the operating frequency of the compressor 11 is again set within the specified frequency range. (22) and repeating this flow to ensure that the total current does not exceed the limit value. I'm doing it.

0010

[Effect of the idea]

As described above, in this invention, when transitioning to heating operation, multiple When several semiconductor heaters are energized to warm circulating indoor air, the total current increases. The current should not exceed the current or overcurrent capacity of the circuit breaker. It is possible to prevent unexpected power outages and maintain a comfortable heating environment.

[Brief explanation of drawings]

FIG. 1 is a partially omitted side sectional view of an indoor unit of the present invention.

FIG. 2 is a block diagram showing the configuration of the present invention.

FIG. 3 is a wind speed-power characteristic diagram of a semiconductor heater.

FIG. 4 is a diagram showing temporal changes in heater A current, heater B current, compressor current, and total current.

FIG. 5 is a flowchart of the present invention.

FIG. 6 is a diagram showing temporal changes in conventional heater A current, heater B current, compressor current, and total current.

[Explanation of symbols]

1 Semiconductor heater 2 Suction port 3 Indoor heat exchanger 4 Air guide path 5 Indoor blower 6 Air outlet 7 Control section 8 Setting input circuit 9 Memory 10 room temperature sensor 11 Compressor 12 Inverter control circuit 13 Energization control circuit 14 Input current detection circuit 15 Timer

Claims (1)

[Scope of utility model registration request] 1. A plurality of semiconductor heaters are provided, and at the start of heating operation, the semiconductor heaters are sequentially energized to heat the indoor air that has passed through the indoor heat exchanger and blown into the room, and at the same time, the controller is instructed to energize the semiconductor heaters. an input current detection circuit that detects the total current including the compressor operating current, an air blower control circuit, a room temperature detection means that detects the room temperature, and an inverter control circuit that controls the compressor function. In an air conditioner control device that controls a compressor to operate at a low capacity in response to changes in indoor temperature and an increase in inrush current of a semiconductor heater, the first semiconductor heater is energized and the inrush current is increased. After the rotation speed of the fan is stabilized and the rotation speed of the blower is lowered, the second semiconductor heater is energized and the total current is controlled so as not to exceed the limit current value of the overload protection device. Machine control device.