阅读说明：本技术 变频控制装置 (Frequency conversion control device ) 是由 江村泰明 于 2018-02-06 设计创作，主要内容包括：本发明的变频控制装置(100)具备：转换器部(31),其将作为从交流电源供给的交流电流的第一交流电流转换为直流电流；第一电流检测部(11),其检测作为第一交流电流的电流值的第一电流值；逆变器部(32),其将直流电流转换为第二交流电流,并将第二交流电流外加于压缩制冷剂的压缩机；第二电流检测部(33),其检测作为第二交流电流的电流值的第二电流值；以及控制部(35),其控制逆变器部(32)。控制部(35)使用第一电流值、第二电流值、压缩机的运转频率以及表示压缩机为运转中或者停止中的压缩机运转信息,进行判定在第一电流值的检测过程中是否发生有异常的异常判定处理。(The frequency conversion control device (100) of the present invention is provided with: a converter unit (31) that converts a first alternating current, which is an alternating current supplied from an alternating current power supply, into a direct current; a first current detection unit (11) that detects a first current value that is a current value of the first alternating current; an inverter unit (32) that converts the direct current into a second alternating current and applies the second alternating current to a compressor that compresses the refrigerant; a second current detection unit (33) that detects a second current value that is the current value of the second alternating current; and a control unit (35) that controls the inverter unit (32). The control unit (35) performs an abnormality determination process for determining whether or not an abnormality has occurred during the detection of the first current value, using the first current value, the second current value, the operating frequency of the compressor, and compressor operating information indicating that the compressor is operating or stopped.)

1. A variable frequency control device is characterized by comprising:

a converter unit that converts a first alternating current, which is an alternating current supplied from an alternating current power supply, into a direct current;

a first current detection unit that detects a first current value that is a current value of the first alternating current;

an inverter unit that converts the direct current into a second alternating current and applies the second alternating current to a compressor that compresses a refrigerant;

a second current detection unit that detects a second current value that is a current value of the second alternating current; and

a control unit that controls the inverter unit,

the control unit performs an abnormality determination process for determining whether or not an abnormality has occurred during detection of the first current value, using the first current value, the second current value, the operating frequency of the compressor, and compressor operation information indicating that the compressor is operating or stopped.

2. The variable frequency control device according to claim 1,

the control unit determines that an abnormality has occurred during detection of the first current value when the first current value is equal to or less than a first current threshold value, the second current value is equal to or more than a compressor current threshold value, the operating frequency of the compressor is equal to or more than an operating frequency threshold value, and the compressor is in operation.

3. The variable frequency control device according to claim 1 or 2,

the control unit performs a state transition process after the abnormality determination process,

the state transition processing is processing for making a transition to any one of a normal state which is a state in which no abnormality has occurred during the detection of the first current value, an abnormality determination state in which it is determined that an abnormality has occurred during the detection of the first current value, and an abnormality hesitation state in which it is not determined that an abnormality has occurred during the detection of the first current value.

4. The variable frequency control device according to claim 3,

after the state transition processing by the control section,

in the normal state, normal processing is performed to perform the abnormality determination processing again,

in the abnormality determination state, performing an abnormality determination process that stops the compressor and does not restart the compressor,

in the abnormality-hesitant state, an abnormality-hesitant process is performed in which the compressor is stopped, the compressor is restarted, and the abnormality determination process is performed again.

5. The variable frequency control device according to claim 4,

in the abnormality determination process, the normal process, the abnormality hesitation process, and the abnormality specification process, the control unit performs a timing process of determining whether or not an abnormality has occurred during the detection of the first current value using a timing.

6. The variable frequency control device according to any one of claims 1 to 5, comprising:

a first connector that passes the first current value;

a second connector which obtains the first current value from the first connector and transmits the first current value to the control unit; and

a connecting wire connecting the first connector with the second connector,

the first substrate is provided with the first current detection unit and the first connector,

the second substrate is provided with the inverter unit, the control unit, and the second connector.

Technical Field

The present invention relates to an inverter control device for driving a compressor of an air conditioner.

Background

An inverter control device of an air conditioner drives a compressor by using three-phase alternating current supplied from an alternating current power supply. In the inverter control device, when there is a phase loss in the ac power supplied from the ac power supply, the ac power is not accurately calculated, and the compressor is not accurately boosted, and the compressor is determined to be abnormal and needs to be stopped because, for example, a step-out or an overcurrent shutdown of the compressor occurs. Patent document 1 discloses an inverter control device that detects a phase loss of ac power input from a three-phase ac power supply.

Patent document 1: japanese laid-open patent publication No. 2008-101860

However, in the conventional frequency conversion control device, if an abnormality occurs during the detection of the primary current, the primary current may not be detected correctly. If the control unit continues to control the compressor in a state where the primary current detection process is abnormal, there is a possibility that the compressor will be out of order or in an overcurrent shutdown. Therefore, the inverter control device is preferably capable of detecting an abnormality during the detection of the primary current.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide an inverter control device capable of detecting an abnormality in the detection of a primary current.

In order to solve the above problems and achieve the object, an inverter control device according to the present invention includes: a converter unit that converts a first alternating current, which is an alternating current supplied from an alternating current power supply, into a direct current; a first current detection unit that detects a first current value that is a current value of the first alternating current; an inverter unit that converts the direct current into a second alternating current and applies the second alternating current to a compressor that compresses a refrigerant; a second current detection unit that detects a second current value that is a current value of the second alternating current; and a control unit that controls the inverter unit. The control unit performs an abnormality determination process for determining whether or not an abnormality has occurred during detection of the first current value, using the first current value, the second current value, the operating frequency of the compressor, and compressor operation information indicating whether the compressor is operating or stopped.

The frequency conversion control device of the present invention has an effect of being able to detect an abnormality in the detection process of the primary current.

Drawings

Fig. 1 is a diagram showing an inverter control device according to an embodiment.

Fig. 2 is a diagram showing functional blocks of a control unit in the embodiment.

Fig. 3 is a diagram showing a configuration example of a control circuit according to the embodiment.

Fig. 4 is a diagram showing a transition of a state of the control process in the embodiment.

Fig. 5 is a flowchart schematically showing the flow of control processing in the embodiment.

Fig. 6 is a diagram showing a timer operation in a normal state in the embodiment.

Fig. 7 is a diagram showing a timer operation in an abnormality determination state and an abnormality hesitation state in the embodiment.

Fig. 8 is a flowchart showing the flow of the control process in the embodiment in detail.

Detailed Description

Hereinafter, an inverter control device according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.