JPH11101541A - Controller for refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rush current upon re-starting a compressor and reduce electric power consumption upon stopping the compressor without providing any rush current preventing circuit by a method wherein the charge of electrolytic capacitor of input of inverter power supply is not charged and the input of AC-DC converter, which is necessitated for the control of the inverter, is intercepted upon stopping the compressor. SOLUTION: A temperature sensitive switch 11, put off when a temperature detected by an inside sensor 6 is lower than a given temperature, is provided and arranged at a position in one side line of input side of the AC-DC converter 7 and not intercepting the supply of an AC power supply for a rectifying circuit upon putting a switch OFF. According to this constitution, the temperature sensitive switch 11 is positioned at a position, not depending on the input of an AC power supply for a rectifying circuit 2 and, therefore, the charged condition of the electrolytic capacitor 3 is continued. Accordingly, big rush current is not conducted when the compressor is re-started at the next time. On the other hand, the input of the AC-DC converter 7 is intercepted upon stopping the compressor whereby the power consumption upon stopping the compressor can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter-controlled refrigerator controller.

[0002]

2. Description of the Related Art In recent years, competition in energy saving has been intensifying in refrigeration systems such as refrigerators and air conditioners, and inverter control has been attracting attention as a means thereof.

In the inverter control, a large electrolytic capacitor is used because a capacitor input type rectifier circuit is used, and an AC-DC converter or a DC-DC converter is used to supply drive power for the inverter and power for the control circuit. I have. Therefore, when the inside of the refrigerator is cooled and the compressor stops, the AC-DC converter or the DC-
The power of the DC converter was supplied, and power loss occurred when the compressor was stopped. In addition, if the inverter is turned off when the compressor is stopped to eliminate power loss when the compressor is stopped, an inrush current prevention circuit must be provided because an inrush current flows through the smoothing electrolytic capacitor of the rectifier circuit when the compressor is restarted. there were.

For example, conventionally, Japanese Utility Model Laid-Open Publication No. 63-127288
Japanese Patent Application Laid-Open Publication No. HEI 9-26131 describes a method for preventing an inrush current. FIG. 6 is a circuit diagram of a conventional inrush current prevention circuit.

In FIG. 6, reference numeral 61 denotes a commercial power supply, which is, for example, a 100 V 50 Hz AC power supply in a general household. Reference numeral 62 denotes a rectifier circuit such as a bridge diode for rectifying the commercial power supply 1.

Reference numeral 63 denotes an electrolytic capacitor for smoothing the output voltage of the rectifier circuit 62. Reference numeral 64 denotes an inverter which uses the voltage between both ends of the output of the electrolytic capacitor 93 as a current.
Is a compressor operated by the inverter 64. 6
Reference numeral 6 denotes a microcomputer for controlling the operation of the compressor. Reference numeral 67 denotes a resistor connected to the input side of the rectifier circuit 62, and a relay contact 68 is connected in parallel with the resistor 67. Reference numeral 69 denotes a switch for turning on / off the commercial power supply.

The inrush current preventing circuit configured as described above will be described below. By delaying the closing operation of the relay contact 68 by the microcomputer 66 when the commercial power supply 61 is turned on, the rectifier circuit 62 and the electrolytic capacitor 6
3 can be reduced in size.

[0008]

However, the conventional configuration has the following problems.

In the case of the conventional example, an inrush current prevention circuit using a resistor and a relay is required to prevent an inrush current. Also, the operation of the compressor 65 is turned on by the microcomputer 66.
/ OFF, it is necessary to supply power to the microcomputer when the compressor 65 is stopped. Therefore, there is a problem that power consumption occurs even when the compressor is stopped.
In recent years, in which the competition for energy saving is intense, the influence of power consumption when the compressor is stopped is increasing.

The present invention provides a control device for a refrigerator having both an inrush current prevention when the compressor is restarted and a reduction in power consumption when the compressor is stopped without providing an inrush current prevention circuit using a resistor or a relay. The purpose is to:

Further, the present invention provides a refrigerator control apparatus which does not have an inrush current prevention circuit using a resistor or a relay and has both an inrush current prevention when the compressor is restarted and a further reduction in power consumption when the compressor is stopped. The purpose is to provide.

Further, the present invention has both an inrush current prevention circuit when the compressor is restarted and a reduction in power consumption when the compressor is stopped without providing an inrush current prevention circuit using a resistor or a relay. An object of the present invention is to provide a control device for a refrigerator that can be used.

Further, the present invention has both an inrush current prevention circuit when the compressor is restarted and a reduction in power consumption when the compressor is stopped without providing an inrush current prevention circuit using a resistor or a relay. An object of the present invention is to provide a control device for a refrigerator capable of discharging electric charge of an electrolytic capacitor output from a rectifier circuit so that a worker can work safely without electric shock when touching a circuit.

[0014]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention prevents the inrush current at the time of restart by preventing the electric charge of the electrolytic capacitor input to the inverter power supply from being discharged when the compressor is stopped. The power consumption can be reduced by shutting off the input of the AC-DC converter necessary for the inverter control during the stop.

Also, by preventing the electric charge of the electrolytic capacitor input to the inverter power supply from being discharged when the compressor is stopped, an inrush current at the time of restart is prevented, and a DC-DC converter input and an inverter power supply required for inverter control when the compressor is stopped. By cutting off the input, power consumption can be further reduced.

Further, since the user can perform the forced operation of the compressor, the user can cool without depending on the internal temperature.

Further, since the electric charge of the electrolytic capacitor output from the rectifier circuit can be discharged, when the service person touches the circuit due to a failure or the like, the operation can be performed safely without electric shock.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides an AC power supply, a rectifier circuit for rectifying an AC output generated from the AC power supply, and an electrolytic capacitor for smoothing an output voltage of the rectifier circuit. An inverter powered by the voltage across the output of the smoothing circuit; a compressor operated by the inverter; a refrigerator internal temperature detector for detecting the refrigerator internal temperature; A DC converter, an inverter control means for controlling the operation of the compressor using the output of the AC-DC converter as a power supply, and an AC-DC
The switching means for turning off the input of the converter and arranging it at a position where the supply of the AC power to the rectifier circuit is not cut off does not discharge the electrolytic capacitor of the inverter power input when the compressor is stopped. Thus, an inrush current at the time of restart is prevented, and an AC-DC converter input required for inverter control is interrupted when the compressor is stopped, thereby reducing power consumption.

According to a second aspect of the present invention, there is provided an AC power supply, a rectifier circuit for rectifying an AC output generated from the AC power supply, an electrolytic capacitor for smoothing an output voltage of the rectifier circuit, and an output of the smoothing circuit. , A compressor operated by the inverter, a refrigerator internal temperature detecting means for detecting the refrigerator internal temperature, and a DC-D receiving the voltage across the electrolytic capacitor output as an input.
C converter, inverter control means for controlling the operation of the compressor using the output of the DC-DC converter as a power supply,
And a second switching means connected to the input side of the DC-DC converter and the inverter and to the output line of the electrolytic capacitor. By not discharging the electric charge, it is possible to prevent an inrush current at the time of restart, and to further reduce power consumption by cutting off a DC-DC converter input and an inverter power supply input necessary for inverter control when the compressor is stopped. Have.

According to a third aspect of the present invention, there is provided the refrigerator according to the first or second aspect, further comprising forced cooling means capable of forcibly operating the compressor without depending on the temperature in the refrigerator. It is a control device, and has an effect that cooling can be performed without depending on the internal temperature in accordance with a user's request by enabling the user to forcibly operate the compressor.

According to a fourth aspect of the present invention, there is provided a control device for a refrigerator according to the first or second aspect, further comprising discharge means capable of forcibly discharging the electric charge of the electrolytic capacitor. Since the output of the electrolytic capacitor can be discharged, when a service person touches the circuit due to a failure or the like, an operation can be performed safely without electric shock.

(Embodiment 1) FIG. 1 is a circuit diagram of a control device of a refrigerator according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a commercial power supply, for example, a 100 V 50 Hz AC power supply in a general household. Reference numeral 2 denotes a rectifier circuit such as a diode bridge for rectifying the commercial power supply 1. Reference numeral 3 denotes an electrolytic capacitor for smoothing the output voltage from the rectifier circuit 2.

An inverter 4 controls the operation of the compressor 5. Reference numeral 6 denotes a contact-type temperature sensor, such as a bimetal, which is disposed in the refrigerator and detects the temperature in the refrigerator.

Reference numeral 7 denotes an AC-DC converter which inputs both ends of an AC power supply line on the input side of the rectifier circuit, and is constituted by a transformer or the like. Reference numeral 8 denotes a control circuit, which outputs a drive signal of a compressor operation command using an output of the AC-DC converter as a power input. 9 is a drive circuit, AC-
The output voltage of the DC converter is used as a power source, and receives a drive signal of a compressor operation command to control the inverter 4.

Reference numeral 10 denotes an inverter control means, which comprises a control circuit 8 and a drive circuit 9.

Reference numeral 11 denotes a temperature-sensitive switch which is turned off when the temperature detected by the internal temperature sensor 6 is equal to or lower than a predetermined temperature T (° C.). It is arranged at a position where the supply of AC power to the rectifier circuit 2 is not interrupted. In this embodiment, the constant temperature T is 4 (° C.).

The operation of the control device for a refrigerator configured as described above will be described below with reference to FIGS. FIG. 2 is a flowchart illustrating the operation.

After the power is turned on, if the temperature t in the refrigerator is t> T in STEP 21, the temperature-sensitive switch 10 is turned on in STEP 22, and the AC-DC converter 7 is operated.
Power is supplied to the drive circuit 8 and the control circuit 9. Next, an operation command is output from the control circuit 9 in STEP23,
The compressor is operated by the inverter 4.

In STEP 21, the temperature inside the refrigerator is t <T.
, The temperature switch 11 is turned off in STEP24.
Then, the input to the AC-DC converter 7 is cut off. Next, in STEP 25, the power supply to the drive circuit 8 and the control circuit 9 is also cut off, and the compressor stops. In this way, the refrigerator is controlled by the operation in which the compressor is repeatedly turned ON / OFF according to the temperature in the refrigerator.

With the above operation, when the compressor is stopped, the temperature-sensitive switch 11 is at a position that does not depend on the input of AC power to the rectifier circuit, so that the electrolytic capacitor 3 remains charged. Next, when the compressor is restarted, a large inrush current does not flow because the electric charge of the electrolytic capacitor 3 is in a charged state.

As described above, since the electrolytic capacitor 3 is charged when the compressor is restarted and a large rush current does not flow, there is no need to provide a rush current prevention circuit. When the compressor is stopped, the input of the AC-DC converter is stopped. So that
It is possible to provide a refrigerator control device capable of reducing power consumption when the compressor is stopped.

(Embodiment 2) FIG. 3 is a circuit diagram of a control device of a refrigerator according to a second embodiment of the present invention. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 12 denotes a DC-DC converter which receives the voltage between both ends of the output of the electrolytic capacitor, and comprises a SW power supply and the like. Reference numeral 13 denotes a second temperature-sensitive switch that is turned off when the temperature detected by the internal temperature sensor 6 is equal to or lower than a predetermined temperature T (° C.), and includes a DC-DC converter 12 and an inverter 4.
And the output line of the electrolytic capacitor 3.

As described above, since the electrolytic capacitor 3 is charged when the compressor is restarted and a large inrush current does not flow, there is no need to provide an inrush current prevention circuit. When the compressor is stopped, the DC-DC converter and the inverter are not used. , The power consumption when the compressor is stopped can be further reduced, thereby providing a refrigerator control device.

The operation of the control device for a refrigerator configured as described above will be described below with reference to FIG. Note that the operation of the second temperature-sensitive switch 13 is the same as that of the temperature-sensitive switch 11 of the first embodiment, and the only difference is the arrangement position. Therefore, the flowchart is the same as that of FIG.

In the operation shown in FIG. 2, when the compressor is stopped, the second temperature sensing switch 13 is at a position independent of the power input to the electrolytic capacitor 3, so that the charged state of the electrolytic capacitor 3 continues. . Next, when the internal temperature rises and the compressor is restarted, a large inrush current does not flow because the electric charge of the electrolytic capacitor 3 is in a charged state.

(Embodiment 3) FIG. 4 is a circuit diagram of a control device of a refrigerator according to a third embodiment of the present invention. 4, components having the same configuration as in FIG. 1 are given the same reference numerals, and description thereof is omitted.

A cooling switch 14 is connected in parallel with the temperature-sensitive switch 11, and uses a push switch or the like.
The cooling switch 14 can be turned on by the user,
The compressor can be forcibly operated without depending on the temperature in the refrigerator.

(Embodiment 4) FIG. 5 is a circuit diagram of a control device of a refrigerator according to a fourth embodiment of the present invention. 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 15 denotes a discharging means, which is a series circuit of a resistor 16 and a discharging switch 17 connected in parallel with the electrolytic capacitor 3. When the service person touches the substrate, the discharge switch 17 turns on the discharge switch 17 to discharge the electric charge stored in the electrolytic capacitor 3, so that the operation can be performed without worry of electric shock.

[0042]

As described above, the refrigerator control device of the present invention does not provide an inrush current prevention circuit using a resistor or a relay and does not discharge the electric charge of the electrolytic capacitor input to the inverter power supply when the compressor is stopped. Inrush current when the compressor is restarted can be prevented, and power consumption can be reduced by cutting off the input of the AC-DC converter required for inverter control when the compressor is stopped.

Also, no rush current prevention circuit using a resistor or a relay is provided, and the charge of the electrolytic capacitor input to the inverter power supply is not discharged when the compressor is stopped, thereby preventing the rush current when the compressor is restarted. In addition, the power consumption can be further reduced by shutting off the input of the DC-DC converter and the input of the inverter power supply necessary for the inverter control when the compressor is stopped.

Further, since the user can perform the forced operation of the compressor, the user can cool without depending on the internal temperature.

Further, since the electric charge of the electrolytic capacitor output from the rectifier circuit can be discharged, when the service person touches the circuit due to a failure or the like, the operation can be performed safely without electric shock.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a control device of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation in the first embodiment.

FIG. 3 is a circuit diagram of a refrigerator control device according to a second embodiment.

FIG. 4 is a circuit diagram of a refrigerator control device according to a third embodiment.

FIG. 5 is a circuit diagram of a refrigerator control device according to a fourth embodiment.

FIG. 6 is a circuit diagram of a conventional refrigerator control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier circuit 3 Electrolytic capacitor 4 Inverter 5 Compressor 6 Internal temperature detection means 7 AC-DC converter 10 Inverter control means 11 Switching means 12 DC-DC converter 13 Second switching means 14 Forced cooling means 15 Discharge means

Claims (4)

[Claims] An AC power supply; a rectifier circuit for rectifying an AC output generated from the AC power supply; an electrolytic capacitor for smoothing an output voltage of the rectifier circuit; Inverter, a compressor operated by the inverter, a refrigerator internal temperature detecting means for detecting the refrigerator internal temperature,
The C-DC converter, the inverter control means for controlling the operation of the compressor using the output of the AC-DC converter as a power supply, and the input of the AC-DC converter are turned off when the internal temperature detection means drops below a certain temperature. And a switching means disposed at a position where the supply of the AC power to the rectifier circuit is not interrupted. 2. An AC power supply, a rectifier circuit for rectifying an AC output generated from the AC power supply, an electrolytic capacitor for smoothing an output voltage of the rectifier circuit, and a power supply for both ends of an output of the smoothing circuit. An inverter, a compressor operated by the inverter, an internal temperature detecting means for detecting an internal temperature of the refrigerator, a DC-DC converter having a voltage between both ends of the electrolytic capacitor output, and a DC-DC converter.
An inverter control means for controlling the operation of the compressor using the output of the DC converter as a power source, and turning off the temperature when the temperature inside the refrigerator becomes lower than a predetermined temperature, at the input side of the DC-DC converter and the inverter, and A refrigerator control device comprising: a second switching unit connected to an output line of the electrolytic capacitor. 3. A forced cooling means capable of forcibly operating the compressor without depending on the temperature in the refrigerator.
The control device for a refrigerator according to claim 2 or 3. 4. The refrigerator control device according to claim 1, further comprising discharge means capable of forcibly discharging the electric charge of the electrolytic capacitor.