JP2011200044A - Power supply device for vibration compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a power supply device for a vibration compressor that has a preferential automatic switching function, without going via a configuration of diode OR connection and a DC/DC converter in a current path, when supplying input-side DC power supply of an inverter, driving a vibration compressor, from power supplies of two systems of battery input and AC/DC input.SOLUTION: The power supply device for a vibration compressor is configured, such that a power supply of battery input conduction-controls a current path by first/second MOS-FETs connected in series so that source terminals are connected to each other and gate terminals are driven by a common gate voltage. A power supply of AC/DC input conduction-controls a current path by a third MOS-FET in a control part. The power supply of the battery input is directly supplied to an inverter. When the power supply of the AC/DC input is connected, the third MOS-FET is made conductive so as to supply power to the inverter, preferentially to the power supply of the battery input. Furthermore, the first/second MOS-FETs prevent supply from the power supply of the battery input and charging to the power supply of the battery input.

Description

  The present invention relates to a power supply device for a vibration compressor configured to supply power by an inverter, and in particular, a commercial AC power supply, a 12V system (mainly a normal passenger car) battery, and a 24V system (mainly a large vehicle such as a bus or a truck). The present invention relates to a power supply device for a vibration type compressor that can be switched automatically corresponding to a battery.

  A vibration type compressor is known as a compressor for compressing refrigerant such as a vehicle-mounted or portable refrigerator, and a power supply device as shown in FIG. 2001-178149). As a DC power source, a power source obtained by boosting a battery 101 such as a vehicle by a DC / DC converter 102 and a power source obtained by converting an AC commercial power source 103 into a DC voltage by an AC / DC converter 104 are diode-ORed (diodes 105 and 106). The vibration type compressor 107 is driven by the inverter 108.

  The power supply from the AC / DC converter 104 includes means for stopping the power supply output from the battery 101 of the vehicle or the like via the DC / DC converter control unit when the voltage is detected by the connection of the AC commercial power supply 103. ing.

  However, when voltage is supplied from the power source boosted by the DC / DC converter 102 to the battery 101 such as the vehicle, a current flows to the inverter 108 via the diode 106, and the AC commercial power source 103 is connected to the DC voltage by the AC / DC converter 104. When a voltage is supplied from the power source converted to, current flows to the inverter 108 via the diode 105, so that a diode (105 or 106) always exists in the current path, and a forward voltage drop due to the diode is lost (for example, current is lost). This is a loss of about 2 watts at 4 amps), which hinders efficiency improvement as a power supply. Since this loss is generated as heat in the diode (105 or 106), a heat sink may be necessary to dissipate the heat.

  Further, the power source obtained by boosting the battery 101 of the vehicle or the like by the DC / DC converter 102 requires a relatively large DC / DC converter 102 for boosting the voltage of the battery 101 to a desired voltage, including its peripheral circuits. Therefore, it is desired to reduce the size and weight of the power supply device.

JP 2001-178149 A

  In order to solve such a problem, the present invention makes a power input system obtained by converting an AC commercial power source into DC and a DC power source input system to which batteries of different voltages (12 V and 24 V) can be connected, and has a diode OR in its current path. It is an object of the present invention to obtain a power supply device that can drive a vibration type compressor without connection and the configuration of a DC / DC converter.

  The present invention employs a MOS-FET as a power source switching element in a current path, and a DC power source input system to which batteries of different voltages (12 V and 24 V) can be connected is connected in series with a source terminal connected to each other. A configuration having a MOS-FET circuit is the most important feature.

  The power supply apparatus for the vibration type compressor of the present invention reduces the loss by utilizing the low on-resistance when the MOS-FET is on, so that the vibration type compressor does not go through the diode OR connection and the DC / DC converter. Therefore, there is an advantage that the power consumption of the power supply device can be improved and the size and weight can be reduced.

FIG. 1 is a schematic block diagram showing an example of a power supply device of a vibration type compressor to which the present invention is applied. FIG. 2 is a flowchart of switching control of the power supply device of the vibration type compressor to which the present invention is applied. FIG. 3 is an explanatory diagram (timing chart) showing a control method of the vibration type compressor using the power supply device of the present invention. FIG. 4 is an explanatory view showing a method of controlling a vibration type compressor using the power supply device of the present invention. FIG. 5 is a flowchart of a method for controlling a vibration type compressor using the power supply device of the present invention. FIG. 6 is an explanatory diagram showing an example of the structure of a vibration type compressor driven by the power supply device of the present invention. FIG. 7 is a schematic block diagram of a power supply device for a conventional vibration type compressor.

  A power supply device for driving a vibration type compressor has a battery input power source and an AC / DC input power source. The battery input power sources are connected to each other at their source terminals, and the gate terminals are driven by a common gate voltage. The conduction path of the current path is controlled by the first and second MOS-FETs connected in series, and the current path of the AC / DC input power source is controlled by the third MOS-FET in the control unit. The battery input power is directly supplied as the input DC power supply of the inverter that drives the vibration compressor. When the AC / DC input power supply is connected, the battery input power is given priority to the inverter. As a result, the third MOS-FET is turned on. In addition, the supply of the battery input power supply and the charging to the battery input power supply are blocked by the first and second MOS-FETs, so that the diode OR connection in the current path and the DC / DC converter are used. A power supply unit for a vibration compressor was realized.

  FIG. 1 is a schematic block diagram showing an example of a power supply device of a vibration type compressor to which the present invention is applied. The structure of the vibration type compressor will be described later. Reference numeral 1 denotes an electromagnetic coil of the vibration type compressor, and 2a and 2b support a piston 34 substantially integrated with the electromagnetic coil as a mechanical vibration system so as to be capable of vibration. A pair of springs. 3 is a control circuit unit for driving the electromagnetic coil 1, 4 is a battery input of a 12V system (mainly a normal passenger car) or a 24V system (mainly a large vehicle such as a bus or truck), and 5 is an AC commercial power source of 100V or 200V. AC / DC input that is a DC converted power supply.

  The internal configuration of the control circuit unit 3 will be described. 6 is a microprocessor unit (MPU), 7 to 10 are switching elements, and these are arranged in an H-shaped full bridge type to constitute an inverter 3a. Drive electrically. The switching elements 7 to 10 are desirably enhancement-type MOS-FETs, but may be bipolar transistors or IGBTs. Reference numeral 11 denotes a capacitor that holds the input DC voltage of the inverter 3a.

  Reference numerals 12 and 13 denote enhancement-type MOS-FETs as first and second power supply switching elements (12D and 13D are diodes inside the elements) for controlling conduction of the battery input 4 as a first power supply. The first MOS-FET 12 and the second MOS-FET 13 are connected to each other at their source terminals, and the gate terminal 14 and the second MOS transistor of the first MOS-FET 12 are driven by a common gate voltage. The gate resistor 15 of the FET 13 is connected to the connection point of the resistor 16 and the gate voltage generation series constant voltage circuit of the Zener diode 17.

  18a and 18b are known ones in which the light-emitting diode portion 18a and the light-receiving transistor portion 18b are integrated to form one photocoupler. Also, 19a and 19b are one similar photocoupler. 20 is a current limiting resistor for input signals of the photocouplers 18a and 19a, 21 is a load resistor of the light receiving transistor portion 19b of the photocoupler, and 22 is a capacitor.

  23 is a comparator for detecting a voltage induced in the electromagnetic coil 1 of the vibration compressor, 24 is an output of the comparator 23 and an output terminal (M) of the microprocessor unit (MPU) 6 and inputs a logical AND output to the micro. An AND circuit that outputs to the output terminal (S) of the processor unit (MPU) 6.

  Reference numeral 25 denotes an enhancement type MOS-FET as a third switching element (25D is a diode inside the element) that controls conduction of the AC / DC input 5 as the second power source. 26 is a gate resistance of the third MOS-FET 25, and 27 and 28 are gate voltage dividing resistors for turning on and off the third MOS-FET 25 in response to a signal from the output port G of the microprocessor unit (MPU) 6. .

  The input side of the inverter 3a in which the switching elements 7 to 10 are arranged in an H shape to form a full bridge type is a DC voltage stored at both ends of the capacitor 11. This DC voltage value, that is, the voltage value at both ends of the capacitor 11 is taken in from the input terminal (R) of the microprocessor unit (MPU) 6 and detected as a DC voltage value.

  A temperature detection element 29 is connected to the input terminal (Q) of the microprocessor unit (MPU) 6. Specifically, the temperature detecting element 29 is a thermistor, thermocouple or the like whose resistance, voltage or other physical quantity changes depending on the temperature.

  The automatic switching operation of the battery input 4 as the first power source and the AC / DC input 5 as the second power source will be described. In order to selectively use the battery input 4 and the AC / DC input 5, the battery input 4 operates the first MOS-FET 12 and the second MOS-FET 13 with the resistor 16, the Zener diode 17, and the gate resistors 14 and 15. Control is performed by the photocoupler (18a, 18b). The AC / DC input 5 receives signals from the resistor 20 and the photocouplers (19a, 19b) and is transmitted to the input port P of the microprocessor unit (MPU) 6 connected to the resistor 21 and the capacitor 22, and is according to a flowchart described later. The determined result is controlled by the gate resistor 26 and the gate voltage dividing resistors 27 and 28 in response to the signal of the output port G of the microprocessor unit (MPU) 6 for the third MOS-FET 25.

  First, the battery input 4 is connected to a 12V system (mainly a normal passenger car) battery or a 24V system (mainly a large vehicle such as a bus or truck), and no voltage is generated at the AC / DC input 5 ( In other words, the operation will be described for a case where a power source obtained by converting 100V or 200V commercial alternating current into direct current is not connected). The voltage of the battery input 4 is applied to the series circuit of the resistor 16 and the Zener diode 17, and the constant voltage generated at both ends of the Zener diode 17 is gated between the gate and the source of the first MOS-FET 12 via the gate resistor 14. The voltage is applied to turn on the first MOS-FET 12, and similarly, the gate voltage is applied between the gate and the source of the second MOS-FET 13 through the gate resistor 15 to apply the second MOS-FET 12. The FET 13 is turned on.

  The current from the positive terminal of the battery input 4 flows between the drain and source of the second MOS-FET 13 and between the source and drain of the first MOS-FET 12 while charging the capacitor 11. To. The voltage charged in the capacitor 11 serves as a DC voltage source for the inverter 3a and electrically drives the electromagnetic coil 1 of the vibration compressor. The resistance (on resistance) between the source and drain of the first MOS-FET 12 in the on state and the drain and source of the second MOS-FET 13 is several milliohms to several tens of milliohms. The loss is much smaller than the power loss due to a general diode forward voltage drop.

  Next, a DC voltage is generated at the AC / DC input 5 (that is, when a DC power source converted from 100V or 200V commercial AC is connected) and no voltage is generated at the battery input 4. The operation will be described for the case (that means when the battery is not connected). When the voltage of the AC / DC input 5 is applied to the series circuit of the resistor 20 and the light emitting diode portion (18a, 19a) of the photocoupler, the light receiving transistor portion of the photocoupler 19b is turned on, and the microprocessor unit (MPU) 6 The input port P is set to low level. The microprocessor unit (MPU) 6 sets the output port G to the high level in accordance with a switching control flowchart described later. This high level voltage is adjusted to a desired voltage value by the gate voltage dividing resistors 27 and 28, and the third MOS-FET 25 is turned on via the gate resistor 26.

  The current from the positive terminal of the AC / DC input 5 flows between the source and drain of the third MOS-FET 25 while charging the capacitor 11, and reaches the negative terminal of the AC / DC input 5. The voltage charged in the capacitor 11 serves as a DC voltage source for the inverter 3a and electrically drives the electromagnetic coil 1 of the vibration compressor. The resistance (on resistance) between the source and drain of the third MOS-FET 25 in the on state is the same as that of the first and second MOS-FETs (12, 13) described above, and the power loss is small.

  Further, the operation will be described in the case where voltages are generated in both the battery input 4 and the AC / DC input 5. In this case, the AC / DC input 5 (a power source obtained by converting a 100V or 200V AC commercial power source into a direct current) is selected in preference to the battery input 4 (a battery power source (not shown)). For this reason, the voltage of the AC / DC input 5 turns on the third MOS-FET 25 and charges the capacitor 11 so that it becomes a DC voltage source of the inverter 3a to electrically drive the electromagnetic coil 1 of the vibration compressor. This is as described above. However, the following operation is performed so as to avoid charging of a battery (not shown) connected to the battery input 4 and collision between the voltage of the battery input 4 and the AC / DC input 5. When the voltage of the AC / DC input 5 is applied to the light-emitting diode portion 18a of the photocoupler, the light-receiving transistor portion 18b of the photocoupler is turned on, and the constant voltage generated at both ends of the Zener diode 17 is applied to the first MOS-FET 12 and the second MOS-FET 12. 2 to the gate voltage value at which the MOS-FET 13 is turned off. Accordingly, both the first MOS-FET 12 and the second MOS-FET 13 are simultaneously turned off. As a result, the voltage at the AC / DC input 5 prevents charging of the battery with the first MOS-FET 12 connected to the battery input 4. Further, when the voltage of the battery input 4 is higher than the voltage of the AC / DC input 5, the second MOS-FET 13 blocks the current path to prevent voltage collision.

  Further, even when a battery (not shown) is connected in reverse to the battery input 4 and a voltage in which + − is reversed appears, the voltage generated at both ends of the Zener diode 17 is a forward low voltage, and the first MOS− The FET 12 and the second MOS-FET 13 are not turned on, and the reverse circuit is blocked by the first MOS-FET 12. For this reason, when the power supply device of the present invention is used in a refrigerator mounted on an automobile or the like, even if the polarity of the battery of the automobile is +/- reversed and connected to the power supply device, the power supply device and the battery Both can operate without reversing damage or damage and reconnecting to the correct polarity.

  The operation of the microprocessor unit (MPU) 6 will be described with reference to the flowchart of switching control in FIG. When the operation starts (step 1), in order to detect the presence or absence of the voltage of the AC / DC input 5, the level of the input port P is captured (step 2). If the level of the input port P is low level “L”, AC / DC It is determined that there is a voltage from the DC input 5 and it is determined to jump to step 4 (step 3), and the output port G is set to the high level “H” in order to turn on the gate signal of the third MOS-FET 25 ( Step 4), or if the level of the input port P is high level “H”, it is determined that there is no voltage and a determination is made to jump to Step 5 (Step 3), and the gate signal of the third MOS-FET 25 is turned off. Therefore, the output port G is set to the low level “L” (step 5), and both of steps 4 and 5 perform return processing to return to the start (step 6).

  Next, control of the vibration type compressor will be described. Referring to FIG. 1, the microprocessor unit (MPU) 6 has output ports a, b, c and d, and gates of the switching elements 7, 8, 9, and 10 through a drive unit (not shown). It is connected to terminals a, b, c, d. The output ports a, b, c, and d of the microprocessor unit (MPU) 6 output H (high level) or L (low level), and the switching elements 7, 8, 9, and 10 are turned on according to the signal. Or it is made to turn off.

  Referring also to FIG. 3, the voltage V applied to the electromagnetic coil 1 of the vibration compressor is an alternating voltage having a repetition period T, which is a positive PWM energization period T1, from positive to negative. Of the idle period T2, the negative PWM energization period T3, and the idle period T4 from negative to positive. PWM is pulse width modulation, and within the energization period of T1, the repetition period T is turned on and off in the positive direction with a period divided into, for example, 256, and the width of the on is bordered by the center of T1. It gradually increases from the beginning of T1, and gradually decreases from the center toward T2.

  Similarly, within the energization period of T3, the repetition period T is turned on and off in the negative direction with a period divided by 256, which is the same as T1, and the width of the ON is gradually increased from the initial stage of T3 with the center of T3 as a boundary. It increases and gradually decreases from the center toward T4. During the period T2, the switching elements 7, 8, and 9 are controlled to be off and only the switching element 10 is on. In the period T4, the switching elements 7, 9, and 10 are controlled to be off and only the switching element 8 is on. Since an induced voltage is generated in the electromagnetic coil 1 within the period of T2 and T4 as described later, comparators 23 for detecting the induced voltage are connected to both ends of the electromagnetic coil 1. The comparator 23 is set so as to make a state transition from L (low level) to H (high level) by capturing a zero cross point where the induced voltage of the electromagnetic coil 1 switches from positive to negative, and one input of the AND circuit 24. A signal is transmitted to the terminal.

  From the output terminal (M) of the microprocessor unit (MPU) 6 so that the control is not affected even if the comparator 23 is affected by the on / off of the voltage V within the period of T1 and T3 which are the PWM energization periods. , H (high level) is output only during the periods T2 and T4 (see the transition state of M in FIG. 3), and a signal is given to the other input terminal of the AND circuit 24. The AND circuit 24 determines the one input level and the other input level, and transmits the logical output result to the input port S of the microprocessor unit (MPU) 6 (see the transition state of S in FIG. 3).

  The mechanism by which the induced voltage is generated in the electromagnetic coil 1 will be described with reference to FIGS.

  First, in the period of T1, the switching elements 7 and 10 are turned off, the switching element 8 is turned on, and the switching element 9 is turned on / off by the aforementioned PWM signal. The current flows in the direction i1 in FIG. 4, and the electromagnetic coil 1 moves in the direction F1 due to the electromagnetic force. As the electromagnetic coil 1 moves, the spring 2a is compressed, and at the same time, the spring 2b expands and accumulates a force, whereby the force acts in the direction of F2 and the voltage width in the positive direction of the PWM signal of the switching element 9 is increased. If it decreases gradually, F1 and F2 will equilibrate soon and the movement of the electromagnetic coil 1 will stop.

  Next, in the period T2, the switching elements 7, 8, and 9 are controlled to be off, and only the switching element 10 is controlled to be on. The electromagnetic coil 1 whose current is cut off from the inverter 3a and has lost the electromagnetic force moves in the F2 direction by the energy stored in the spring 2a and the spring 2b. As a result, an induced voltage in which the arrow side of V0 is positive is generated in the electromagnetic coil 1 due to the magnetic flux density, and the current is present in the switching element 10 and the switching element 8 in the i2 direction due to the generated voltage. Since the current flows through the diode, the direction of the voltage indicated by V0 is switched from positive to negative voltage.

  Further, in the period T3, when the switching elements 8 and 9 are turned off, the switching element 10 is turned on, and the switching element 7 is turned on / off by the aforementioned PWM signal, the electromagnetic coil 1 is moved in the direction F2 opposite to the period T1. Start moving. The spring 2a is compressed from extension to extension, and at the same time, the spring 2b is compressed from extension to accumulate the force. As a result, when a force is applied in the direction of F1 and the voltage width in the negative direction of the PWM signal is gradually reduced, F2 and F1 are eventually balanced and the movement of the electromagnetic coil 1 is stopped.

  Finally, in the period T4, the switching elements 7, 9, 10 are controlled to be off, and only the switching element 8 is controlled to be on. The electromagnetic coil 1 whose current is cut off from the inverter 3a and has lost the electromagnetic force moves in the F1 direction by the energy stored in the spring 2a and the spring 2b. As a result, an induced voltage in which the arrow side of V0 is negative is generated in the electromagnetic coil 1 due to the magnetic flux density, and the current is present in the switching element 8 and the switching element 10 in the i1 direction due to the generated voltage. Since the current flows through the diode, the direction of the voltage indicated by V0 is switched from negative to positive voltage. A continuous period of T1, T2, T3, and T4 becomes one repetition period T and shifts to the next repetition period T.

  Next, a control method of the vibration type compressor will be described with reference to the flowchart of FIG. Various software is incorporated in the microprocessor unit (MPU) 6. Here, only the flow of the control method of the vibration type compressor is shown.

  When this control is started, the reference timing K is read from a map preset in a storage device (including a storage area inside the software). The elements of the reference timing K include the repetition period T shown in FIG. 3, the positive PWM energization period T1, the positive to negative idle period T2, the negative PWM energization period T3, the negative to positive idle period T4, PWM Each pulse width within the energization period and a basic frequency is generated (step S0, basic waveform generation step).

  Each pulse width within the PWM energization period is the DC voltage value on the input side of the inverter 3a read from the input terminal (R) and the ambient detected by the temperature detection element 29 read from the input terminal (Q). Calculation is performed based on two conditions of temperature, and the reference timing K is set in the internal memory as a parameter (step S1, PWM pulse width calculation step). The DC voltage on the input side of the inverter 3a is calculated so that the pulse width is widened when the DC voltage value is low, and is narrowed when the DC voltage value is high, and the ambient temperature is calculated to widen the pulse width as the temperature is high. This is because when the vibration type compressor is mounted on the refrigerator, it is desired to control the temperature inside the refrigerator to be a desired temperature earlier by applying electric power to the vibration type compressor as the outside air temperature is higher.

  A zero crossing point at which the voltage induced in the electromagnetic coil 1 from positive to negative within the period T2 is set so that the electromagnetic coil 1 follows the resonance frequency combined with the springs 2a and 2b and the suction / discharge conditions as a compressor. To detect. This uses the clock signal of the microprocessor unit (MPU) 6 during the period from the start point of the repeat cycle T shown in FIG. 3 to the point when the input port S changes state from L (low level) to H (high level). Then, this parameter is set in the internal memory as the detection signal timing A (step S2, zero cross point detection step).

  The internal memory value at the detection signal timing A and the internal memory value at the reference timing K are compared to determine the magnitude of the value (step S3, timing determination step).

  In the case of A <K, the value of the repetition period T is decreased, and the repetition period T is shortened in the next cycle. If the relationship of A <K is not established, the value of the repetition period T is increased and the next period is lengthened (step S4, frequency correction step).

  This completes one cycle of the control loop and returns to “Z” (return). By repeating this cycle, the magnitude and frequency of the alternating voltage supplied to the electromagnetic coil 1 of the vibration type compressor are controlled. Therefore, even if the DC voltage value of the input side capacitor 11 of the inverter 3a is changed between the battery input 4 as the first power source and the AC / DC input 5 as the second power source, the vibration compressor The electromagnetic coil 1 can be controlled in a desired state.

  The structure of the vibration type compressor will be described with reference to FIG. A closed-bottomed cylindrical outer iron core 31 in an airtight container 30, an inner iron core 32 (core pole) that forms a magnetic path together with the outer iron core 31, a permanent magnet 33 disposed on the inner iron core 32 of the magnetic path, and a permanent magnet An electromagnetic coil 1 disposed in an annular gap formed by the outer core 31 and the external iron core 31 and supported by a mechanical vibration system so as to be able to vibrate, a piston 34 connected to the electromagnetic coil 1, and a cylinder block for housing the piston 34 35, which supplies an alternating current to the electromagnetic coil 1 to vibrate the piston 34 connected to the electromagnetic coil 1, flows a low-pressure refrigerant into the sealed container 30, and discharges a compressed high-pressure refrigerant. It is applied to refrigerators mounted on automobiles and portable types.

  As described above, since the MOS-FET is used for the configuration of the power supply device of such a vibration type compressor, particularly the first, second, and third power switching elements, the MOS-FET is in the ON state. By using a low on-resistance, it is possible to realize a power supply device for a vibration compressor with reduced loss due to a conventional diode. Further, without using a conventional DC / DC converter, the vibration type compressor can be driven by directly inputting the voltage of the battery input 4 as the first power source or the AC / DC input 5 as the second power source into the inverter. .

  As a power supply device for a vibration type compressor, it can be automatically switched to a commercial AC power source, a 12V system (mainly ordinary passenger car) battery, and a 24V system (mainly large vehicles such as buses and trucks). Since it is useful as high efficiency and small size and light weight, it can be mounted on a vehicle-mounted or portable refrigerator.

DESCRIPTION OF SYMBOLS 1 Electromagnetic coil 2a, 2b Spring 3 Control circuit part 3a Inverter 4 Battery input 5 AC / DC input 6 Microprocessor unit (MPU)
7 to 10 Switching element 11 Capacitor 12 MOS-FET as first power source switching element
13 MOS-FET as second power switching element
14, 15 Gate resistance 16 Resistance 17 Zener diodes 18a, 18b Light emitting diode part and light receiving transistor part 19a, 19b of the first photocoupler Light emitting diode part of the second photocoupler, light receiving transistor part 20 Resistance 21 Load resistance 22 Capacitor 23 Comparator 24 AND circuit 25 MOS-FET as third power switching element
26 Gate resistance 27, 28 Gate voltage dividing resistance 29 Temperature detection element 30 Sealed container 31 External iron core 32 Internal iron core 33 Permanent magnet 34 Piston 35 Cylinder block S0 Basic waveform generation step S1 PWM pulse width calculation step S2 Zero cross point detection step S3 Timing Determination step S4 Frequency correction step 101 Battery 102 DC / DC converter 103 AC commercial power supply 104 AC / DC converter 105, 106 Diode 107 Vibrating compressor 108 Inverter 109 First transistor 110 Second transistor 111 Inverter control unit 112 Frequency tracking Circuit 113 Oscillation circuit 114 Drive control circuit 115 Capacitor 116 DC fan motor

Claims (1)

  An inverter that drives a vibration type compressor having a hermetic container containing a refrigerant, a piston that reciprocates in the hermetic container to compress the refrigerant, and an electromagnetic coil that drives the piston, and controls the inverter In the power supply device of the vibration type compressor including a control unit and an input side DC power source unit of the inverter, the input side DC power source unit includes a battery input power source and an AC / DC input power source, and the battery input The power source is connected to the source terminal and the gate terminal is driven by a common gate voltage, the current path is controlled by the first and second MOS-FETs connected in series, and the AC / DC input is connected. The power source is configured such that the current path is controlled by the third MOS-FET in the control unit, and the battery input power source can be supplied as the input side DC power source unit. When an AC / DC input power source is connected, the third MOS-FET is turned on so that the power is supplied to the inverter in preference to the battery input power source. A power supply device for a vibration type compressor, wherein charging to a power source of a battery input is blocked by the first and second MOS-FETs.