POWER CIRCUIT, AND COMPUTER-READABLE RECORDING MEDIUM STORING A CONTROL PROGRAM FOR POWER CIRCUITS
First Claim
1. A power circuit (1) for an air conditioner in which a refrigeration cycle is executed by circulating a refrigerant in a refrigerant circuit where a compressor, a heat-source-side heat exchanger, an expansion valve, and a utility-side heat exchanger are connected by piping,the power circuit comprising:
- a rectifier circuit (RC) that rectifies alternating current power supplied from an external power source;
a smoothing unit (C) that smoothes output power of the rectifier circuit (RC);
a main relay (10) provided on a current path between the rectifier circuit (RC) and the smoothing unit (C);
an inverter circuit (30) connected between the smoothing unit (C) and an inverter motor (M) which is a load and generating alternating current power to be supplied to the inverter motor (M);
a microcomputer (100) having a main relay opening/closing control unit (120) that outputs an opening/closing control signal which provides opening/closing direction to the main relay (10), an inverter circuit control unit (110) outputting a drive signal to the inverter circuit (30), a waveform forced cut-off unit (130) that receives input of an abnormality signal outputted when an abnormality detection unit (200), which detects an abnormality of the air conditioner, detects the abnormality, and electrically cuts off the inverter circuit control unit (110) when the abnormality signal is inputted, and a cut-off signal output unit (140) that outputs a cut-off signal that is a control signal setting the main relay (10) to an open state to the main relay (10) when the abnormality signal is inputted to the waveform forced cut-off unit (130), and moreover the microcomputer (100) controlling opening/closing operation of the main relay (10) and operation of the inverter circuit (30); and
a delay circuit (40) that receives input of the cut-off signal and outputs the cut-off signal to the main relay (10) after a predetermined time elapses since the input, whereinwhen the main relay (10) is in a closed state and the abnormality signal has been inputted to the waveform forced cut-off unit (130), the waveform forced cut-off unit (130) electrically cuts off the inverter circuit control unit (110), the cut-off signal outputted from the cut-off signal output unit (140) is inputted to the main relay (10) via the delay circuit (40), and the main relay (10) is set to an open state by the input of the cut-off signal.
1 Assignment
0 Petitions
Accused Products
Abstract
When an abnormality occurs in a refrigeration cycle, the inverter motor provided in the air conditioner is stopped reliably and contacts of the main relay are prevented from degradation and fusion. A power circuit 1 of the air conditioner includes a rectifier circuit RC, a capacitor C (smoothing unit), a main relay 10 provided on a current path between the rectifier circuit RC and the capacitor C, an inverter circuit 30, a microcomputer 100, and a delay circuit 40. The microcomputer 100 has an inverter circuit control unit 110, a main relay opening/closing control unit 120, a waveform forced cut-off unit 130, and a cut-off signal output unit 140. Where a high-pressure switch 200 (abnormality detection unit) detects a high-pressure abnormality and outputs a high-pressure abnormality signal to the waveform forced cut-off unit 130 when the main relay 10 is in a closed state, the waveform forced cut-off unit 130 electrically cuts off the inverter circuit control unit 110, and the cut-off signal output unit 140 outputs a cut-off signal, which sets the main relay 10 to the open state, to the main relay 10 via the delay circuit 40.
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Citations
11 Claims
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1. A power circuit (1) for an air conditioner in which a refrigeration cycle is executed by circulating a refrigerant in a refrigerant circuit where a compressor, a heat-source-side heat exchanger, an expansion valve, and a utility-side heat exchanger are connected by piping,
the power circuit comprising: -
a rectifier circuit (RC) that rectifies alternating current power supplied from an external power source; a smoothing unit (C) that smoothes output power of the rectifier circuit (RC); a main relay (10) provided on a current path between the rectifier circuit (RC) and the smoothing unit (C); an inverter circuit (30) connected between the smoothing unit (C) and an inverter motor (M) which is a load and generating alternating current power to be supplied to the inverter motor (M); a microcomputer (100) having a main relay opening/closing control unit (120) that outputs an opening/closing control signal which provides opening/closing direction to the main relay (10), an inverter circuit control unit (110) outputting a drive signal to the inverter circuit (30), a waveform forced cut-off unit (130) that receives input of an abnormality signal outputted when an abnormality detection unit (200), which detects an abnormality of the air conditioner, detects the abnormality, and electrically cuts off the inverter circuit control unit (110) when the abnormality signal is inputted, and a cut-off signal output unit (140) that outputs a cut-off signal that is a control signal setting the main relay (10) to an open state to the main relay (10) when the abnormality signal is inputted to the waveform forced cut-off unit (130), and moreover the microcomputer (100) controlling opening/closing operation of the main relay (10) and operation of the inverter circuit (30); and a delay circuit (40) that receives input of the cut-off signal and outputs the cut-off signal to the main relay (10) after a predetermined time elapses since the input, wherein when the main relay (10) is in a closed state and the abnormality signal has been inputted to the waveform forced cut-off unit (130), the waveform forced cut-off unit (130) electrically cuts off the inverter circuit control unit (110), the cut-off signal outputted from the cut-off signal output unit (140) is inputted to the main relay (10) via the delay circuit (40), and the main relay (10) is set to an open state by the input of the cut-off signal. - View Dependent Claims (2, 3)
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4. A power circuit (2) for an air conditioner in which a refrigeration cycle is executed by circulating a refrigerant in a refrigerant circuit where a compressor, a heat-source-side heat exchanger, an expansion valve, and a utility-side heat exchanger are connected by piping,
the power circuit comprising: -
a rectifier circuit (RC) that rectifies alternating current power supplied from an external power source; a smoothing unit (C) that smoothes output power of the rectifier circuit (RC); a main relay (10) provided on a current path between the rectifier circuit (RC) and the smoothing unit (C); an inverter circuit (30) connected between the smoothing unit (C) and an inverter motor (M) which is a load and generating alternating current power to be supplied to the inverter motor (M); and a microcomputer (100A) that controls opening/closing operation of the main relay (10) and operation of the inverter circuit (30), wherein the microcomputer (100A) has; a main relay opening/closing control unit (120) that outputs an opening/closing control signal which provides opening/closing direction to the main relay (10); an inverter circuit control unit (110) outputting a drive signal to the inverter circuit (30); and a waveform forced cut-off unit (130) that receives input of an abnormality signal outputted when an abnormality detection unit (200), which detects an abnormality of the air conditioner, detects the abnormality, and electrically cuts off the inverter circuit control unit (110) when the abnormality signal is inputted, and when the main relay (10) is in a closed state and the abnormality signal has been inputted to the waveform forced cut-off unit (130), the waveform forced cut-off unit (130) electrically cuts off the inverter circuit control unit (110), and the main relay opening/closing unit (120) maintains the closed state of the main relay (10).
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5. A power circuit (3) for an air conditioner in which a refrigeration cycle is executed by circulating a refrigerant in a refrigerant circuit where a compressor, a heat-source-side heat exchanger, an expansion valve, and a utility-side heat exchanger are connected by piping,
the power circuit comprising: -
a rectifier circuit (RC) that rectifies alternating current power supplied from an external power source (E); a smoothing unit (C) that smoothes output power of the rectifier circuit (RC); a main relay (10) provided on a current path between the rectifier circuit (RC) and the smoothing unit (C); an inverter circuit (30B) connected between the smoothing unit (C) and an inverter motor (M) which is a load and generating alternating current power to be supplied to the inverter motor (M); a gate IC (101) that drives the inverter circuit (30B); and a microcomputer (100B) that controls opening/closing operation of the main relay (10) and operation of the gate IC (101), wherein the gate IC (101) has; a control signal input unit (160) that receives input of a control signal outputted from the microcomputer (100B); a drive signal output unit (170) that outputs a drive signal to the inverter circuit (30B) in response to the control signal; and a waveform forced cut-off unit (130) that receives inputs of an abnormality signal outputted when an abnormality detection unit (200), which detects an abnormality of the air conditioner, detects the abnormality, and electrically cuts off the drive signal output unit (170) when the abnormality signal is inputted, and when the main relay (10) is in a closed state and the abnormality signal has been inputted to the waveform forced cut-off unit (130), the waveform forced cut-off unit (130) electrically cuts off the drive signal output unit (170), and the microcomputer (100B) maintains the closed state of the main relay (10). - View Dependent Claims (6)
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7. A power circuit (4) for an air conditioner in which a refrigeration cycle is executed by circulating a refrigerant in a refrigerant circuit where a compressor, a heat-source-side heat exchanger, an expansion valve, and a utility-side heat exchanger are connected by piping,
the power circuit comprising: -
a rectifier circuit (RC) that rectifies alternating current power supplied from an external power source (E); a smoothing unit (C) that smoothes output power of the rectifier circuit (RC); a main relay (10) provided on a current path between the rectifier circuit (RC) and the smoothing unit (C); an inverter circuit (30) connected between the smoothing unit (C) and an inverter motor (M) which is a load and generating alternating current power to be supplied to the inverter motor (M); and a control unit (100C) that controls opening/closing operation of the main relay and operation of the inverter circuit, wherein the control unit (100C) is provided with; a main relay opening/closing control unit (120) that outputs a control signal which provides an opening/closing direction to the main relay (10); an inverter circuit control unit (110) that outputs a drive signal to the inverter circuit (30); and an abnormality signal reception unit (180) that receives an abnormality signal outputted when an abnormality detection unit (500), which detects an abnormality of the air conditioner, detects the abnormality, and when the abnormality signal reception unit (180) receives the abnormality signal, the inverter circuit control unit (110) outputs a drive signal that stops the inverter circuit (30) and, after a predetermined first delay time elapses since the output, the main relay opening/closing control unit (120) outputs a control signal that sets the main relay (10) to an open state. - View Dependent Claims (8, 9, 11)
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10. A computer-readable recording medium storing a control program of a power circuit that is provided in an air conditioner in which a refrigeration cycle is executed by circulating a refrigerant in a refrigerant circuit where a compressor, a heat-source-side heat exchanger, an expansion valve, and a utility-side heat exchanger are connected by piping, and includes a rectifier circuit that rectifies alternating current power supplied from an external power source;
- a smoothing unit that smoothes output power of the rectifier circuit;
a main relay provided on a current path between the rectifier circuit and the smoothing unit;
an inverter circuit connected between the smoothing unit and an inverter motor which is a load and generating alternating current power to be supplied to the inverter motor; and
a microcomputer that controls opening/closing operation of the main relay and operation of the inverter circuit,the control program causing the microcomputer to execute; a first step of receiving an abnormality signal informing about an abnormality of the air conditioner; a second step of stopping the inverter circuit when the abnormality signal is received; and a third step of opening the main relay after a predetermined time elapses since the execution of the second step.
- a smoothing unit that smoothes output power of the rectifier circuit;
Specification