JP2000152692A - Compressor-drive device for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the compressor-drive device for an air-conditioner that can suppress leakage current due to the rapid change in a grounding voltage waveform due to high power factor pulse to a low level. SOLUTION: A compressor-drive device is provided with a first power conversion means for converting an AC voltage from an AC power supply 1 into a DC voltage, a second power conversion means for converting a DC voltage that is converted by the first power conversion means and for supplying it into an electric motor 10 for driving a compressor, a high power factor means that includes a reactor which is connected in series between the AC power supply 1 and the first power conversion means and short-circuits the AC power supply 1 for one or a plurality of periods, after an AC voltage passes a zero point via the reactor, and a zero-phase current detection means for detecting the zero-phase current of a main circuit system where a drive power is supplied to the electric motor 10. The compressor-drive device is also provided with a leaking current compensation means for reducing the current that leaks from the electric motor 10 to a grounding point, based on the detection value of the zero-phase current detection means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high power factor circuit for improving a power factor in a main circuit system for supplying electric power to a motor for driving a compressor (hereinafter simply referred to as a compressor). To a compressor driving device for an air conditioner.

[0002]

2. Description of the Related Art To extract more effective power from a power supply device, it is effective to improve the power supply power factor. For this purpose, a method for simply improving the power supply power factor has been proposed. In addition, by improving the power supply power factor, it is often possible to reduce the harmonic current of the power supply, which has recently become a problem, and it is possible to comply with domestic and foreign harmonic current regulations. As a conventional method for improving the power supply power factor, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. 10-80139.
In this disclosure, by turning on the switching element only for an appropriate short period after the AC input voltage has passed through the zero point, and short-circuiting the AC power supply via the reactor,
The conduction period of the power supply current is extended, and the power supply power factor is improved.

FIG. 7 is a circuit diagram showing a configuration of a conventional compressor driving device for an air conditioner provided with such a power supply device.
In FIG. 1, one end of a reactor 2 is connected to one end of an AC power supply 1. The other end of the reactor 2 has diodes 3a to 3
d is connected to the AC voltage input terminal of the full-wave rectifier circuit. The other end of the AC power supply 1 is grounded and connected to an AC voltage input terminal of a full-wave rectifier circuit in which diodes 3a to 3d are bridge-connected.

In this case, the full-wave rectifier circuit is a diode 3a
And a series connection circuit of a diode 3b and a diode 3c
And a series connection circuit of the diode 3d are connected in parallel,
The other end of the reactor 2 is connected to the interconnection point of the diodes 3a and 3b,
The other end of the AC power supply 1 is connected to the interconnection point d.

The anode of the diode 4a is connected to the junction of the diodes 3a and 3b, the anode of the diode 4b is connected to the junction of the diodes 3c and 3d, and the cathodes of these diodes are connected to each other. It is connected. The collector of a transistor 5 as a switching element is connected to the mutually connected cathodes, and the emitter of the transistor 5 is connected to the negative DC voltage output terminal of the full-wave rectifier circuit. Then, although a detailed description is omitted, a high power factor pulse for turning on the transistor 5 for a short period is applied to the base of the transistor 5. These diodes 4a, 4
b and the transistor 5 together with the reactor 2 constitute a high power factor circuit.

On the other hand, a smoothing capacitor 8 is connected between the positive and negative DC voltage output terminals of the full-wave rectifier circuit composed of the diodes 3 a to 3 d, and the smoothed DC voltage is applied to the inverter device 9. Although the inverter device 9 is not described in detail, the inverter device 9 is, for example, a device in which six transistors are bridge-connected, and by turning on and off these transistors in a predetermined order by an inverter control pulse, direct current is converted into a pseudo three-phase alternating current. And supplied to the compressor 10.

[0007] Here, from the AC power supply 1, as shown in FIG. 8 (a), the AC voltage V _in of 200V diode 3a~
When supplied to the full-wave rectifying circuit made of 3d, the voltage V _in
Is full-wave rectified, and a current for charging the smoothing capacitor 8 flows for each half-wave. Further, the short period of time immediately after the AC voltage V _in exceeds the zero point, as shown in FIG. 8 (b), the addition of two high power factor pulse to the base of transistor 5, the ground (herein In a positive voltage section viewed from the ground point), a circuit of AC power supply 1 → reactor 2 → diode 4a → transistor 5 → diode 3d → AC power supply 1 is formed. In a negative voltage section viewed from the ground point, A circuit of AC power supply 1 → diode 4b → transistor 5 → diode 3b → reactor 2 → AC power supply 1 is formed, and AC power supply 1 is short-circuited via reactor 2 respectively. As a result, the charging time of each of the smoothing capacitors 8 is extended to the zero point side of the AC voltage by the energy stored in the reactor 2, and the power supply power factor is improved.

It is to be noted that the point that an inverter control pulse is applied to the inverter device 9 to convert a DC voltage into a pseudo three-phase AC voltage and supply it to the compressor 10 is described in detail in literatures and publications. Description is omitted.

[0009]

[SUMMARY OF THE INVENTION In the compressor driving device of a conventional air conditioner described above, the voltage V ₁ of the negative side of the DC voltage with respect to ground point, as shown in FIG. 8 (c), the AC voltage the rapidly changing waveform for each half cycle of V _in. Therefore, the stator of the compressor 10 according to the time rate of change of the voltage _{V 1 (dV 1 / dt)} , through the stray capacitance, leakage current i ₁ of the high frequency flows. This high frequency leakage current i ₁
Is inductively transmitted to the AC power supply 1 side, and the inverter device 9
There is a fear that the drive control of the device may be adversely affected, or a malfunction of other home electric appliances or breakers may occur.

The present invention has been made in view of the above circumstances, and has a compressor driving apparatus for an air conditioner capable of suppressing a leakage current caused by a rapid change of a ground voltage waveform due to a high power factor pulse. The purpose is to provide.

[0011]

The invention according to claim 1 is
A first power converter for converting an AC voltage from an AC power supply into a DC voltage; and a second power converter for converting the DC voltage converted by the first power converter into an AC voltage and supplying the AC voltage to a motor for driving the compressor. Power conversion means, including a reactor connected in series between the AC power supply and the first power conversion means, one or more predetermined periods after the AC voltage has passed the zero point,
A high power factor means for short-circuiting an AC power supply via a reactor, and a zero-phase current detection means for detecting a zero-phase current of a main circuit system to which drive electric power is supplied to the motor; And a leakage current compensating means for reducing a leakage current leaking from the electric motor to the ground point based on the above.

According to a second aspect of the present invention, in the compressor driving device for an air conditioner according to the first aspect, the first power conversion means performs full-wave rectification of an AC voltage from an AC power supply. And a smoothing capacitor for smoothing the output of the full-wave rectifier circuit.

According to a third aspect of the present invention, in the compressor driving device for an air conditioner according to the first aspect, the first power conversion means doubles the voltage of the AC voltage from the AC power supply. It is provided with.

According to the first to third aspects of the present invention, the leakage current caused by the rapid change of the ground voltage waveform due to the high power factor pulse can be suppressed low.

According to a fourth aspect of the present invention, in the air conditioner compressor driving apparatus according to any one of the first to third aspects, the leakage current compensating means converts an AC voltage from an AC power supply into a DC voltage. And a push-pull amplifier that uses the DC voltage converted by the third power converting means as an operating power supply and causes the amplified current of the detection value of the zero-phase current detecting means to flow to a ground point. . The invention according to claim 5 is the compressor drive device for an air conditioner according to claim 4, wherein the third power conversion means includes a full-wave rectifier circuit for performing full-wave rectification of an AC voltage from an AC power supply. And a smoothing capacitor for smoothing the output of the full-wave rectifier circuit.

According to the present invention, since the leakage current compensating means is driven by a power source different from the compressor driving power source, the leakage current can be stably compensated.

According to a sixth aspect of the present invention, in the compressor driving device for an air conditioner according to the fifth aspect, the third power conversion means uses a high-speed diode as a rectifying element.

According to the sixth aspect, even when the ground voltage of the DC power supply fluctuates rapidly, there is also an effect that a compensating current that follows the sudden fluctuation can be reliably supplied. The invention according to claim 7 is the compressor drive device for an air conditioner according to claim 4, wherein the third power conversion means includes:
It is provided with a voltage doubler rectifier circuit that doubles voltage rectifies an AC voltage from an AC power supply.

According to a seventh aspect of the present invention,
Since the neutral point of the DC power supply can be fixed with respect to the ground point, more stable leakage current compensation becomes possible.

According to an eighth aspect of the present invention, in the compressor driving device for an air conditioner according to the fourth aspect, the third power conversion means performs a half-wave rectification of an AC voltage from an AC power supply. It is provided with.

According to the eighth aspect of the present invention,
There is also an advantage that the number of parts can be reduced and leakage current can be compensated with an inexpensive configuration.

According to a ninth aspect of the present invention, in the compressor driving device for an air conditioner according to any one of the first to eighth aspects, the zero-phase current detecting means is provided on the AC power supply side of the leakage current compensating means. Things.

According to the ninth aspect, the current compensated by the leakage current compensating means is not detected as a zero-phase current, and an effect of preventing an oscillation phenomenon can be obtained.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings. FIG. 1 is a circuit diagram showing a configuration of a first embodiment of a compressor driving device for an air conditioner according to the present invention. In the figure, the same elements as those in FIG. 7 showing the conventional device are denoted by the same reference numerals, and the description thereof will be omitted. Here, a low-pass filter 7 is newly provided between the full-wave rectifier circuit composed of the diodes 3 a to 3 d and the smoothing capacitor 8.

The low-pass filter 7 has a coil 7a, a coil 7b, and a coil 7c wound around an annular iron core. Among these, the coil 7a and the coil 7b are made of a copper wire wound synchronously. If the load side is considered to be a noise source than the low-pass filter 7, a noise current flows through the coil 7a on one side. And the opposite coil 7
The magnetic flux generated by the noise current returning through b cancels each other, thereby removing high-frequency noise components. However, the compressor 10
When the current leaks from the ground to the ground point, the magnetic fluxes of the coils 7a and 7b are not canceled each other, and a voltage corresponding to the zero-phase current is generated in the coil 7c. Therefore, the coil 7c wound around the iron core of the low-pass filter 7 corresponds to the zero-phase current detecting means of the present invention.

In order to compensate for the leakage current by the output of the coil 7c, a full-wave rectifier circuit composed of diodes 11a to 11d, a smoothing capacitor 12, an NPN transistor 14, a PNP transistor 15, a diode 16,
17 and a push-pull amplifier circuit comprising
The output voltage, via a resistor 18, in addition to the push-pull amplifier circuit, the output of resistor 19 as a load, so that through the capacitor 20 supplying a current i ₂ to the ground. These form a leakage current compensation circuit.

In this case, a series connection circuit of the diode 11c and the diode 11d is connected in parallel to a series connection circuit of the diode 11a and the diode 11b, and an interconnection point of the diode 11a and the diode 11b is connected to the other end of the AC power supply 1. , And an interconnection point of the diodes 11c and 11d is connected to an AC power supply line on the load side of the reactor 2.

Further, a smoothing capacitor 12 is connected to both ends of the diode series connection circuit, thereby forming a DC power supply circuit independent of the main circuit system. The NPN transistor 14 and the PNP transistor 15 connect the emitters together to form a series connection circuit, and both ends are connected to both ends of the smoothing capacitor 12. And
The NPN transistor 14 includes a reflux diode 16.
However, the PNP transistor 15 has a diode 1 for circulation.
7 are connected in anti-parallel. The bases of the NPN transistor 14 and the PNP transistor 15 are connected to each other. The coil 7 is connected between the interconnected base and the emitter via the resistor 18.
c is connected. As a result, a push-pull amplifier circuit having an emitter connected to each other as an output terminal is formed.
₂ flows to the ground point.

In the first embodiment shown in FIG. 1, the diodes 3a to 3d and the smoothing capacitor 8 correspond to the first power converter of the present invention, and the inverter 9 corresponds to the second power converter. It corresponds to. Further, the diodes 11a to 11d and the smoothing capacitor 12 constituting the leakage current compensating circuit correspond to the third power converter of the present invention.

The operation of the first embodiment configured as described above will be described below, particularly focusing on parts different from the conventional apparatus. Diodes 11a to 11d
The output of the full-wave rectifier circuit constituted by the above is smoothed by the smoothing capacitor 12, and the DC voltage is supplied as the operating power of the push-pull amplifier including the NPN transistor 14 and the PNP transistor 15. And
When a zero-phase current caused by leakage current i ₁ leaked from compressor 10 to the ground point flows, a current corresponding to the current value becomes N
It is provided as an input to a push-pull amplifier comprising a PN transistor 14 and a PNP transistor 15. Then, the amplified current i ₂ flows to the ground through the resistor 19 and the capacitor 20. Together with the current i ₂ is the leakage current i ₁ and magnitude of the compressor 10 is substantially connected coil 7c is such that the polarity of the same opposite, the value of resistor 19 is chosen appropriately.

Thus, according to the first embodiment, it is possible to suppress the leakage current caused by the rapid change of the ground voltage waveform due to the high power factor pulse of the high power factor circuit. Further, since the leakage current compensating circuit includes the independent DC power supply circuit, the leakage current can be compensated stably.

FIG. 2 is a circuit diagram showing the configuration of a second embodiment of the compressor driving device for an air conditioner according to the present invention. In the figure, the same elements as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. This differs from the configuration in FIG. 1 in that a voltage doubler rectifier circuit is used instead of the full-wave rectifier circuit constituting the main circuit system. Here, a series connection circuit of the capacitors 6a and 6b is connected in parallel to a series connection circuit of the diodes 3a and 3b. One end of the AC power supply 1 is connected via a reactor 2 to an interconnection point of the diodes 3a and 3b, and the other end of the AC power supply 1 is connected to an interconnection point of the capacitors 6a and 6b. Also,
Both ends of the series connection circuit of the capacitors 6 a and 6 b are connected to the inverter device 9 via the low-pass filter 7.

The second embodiment shown in FIG. 2 is based on the assumption that drive power is obtained from a 100 V AC power supply.
The capacitor 6a and the capacitor 6b are charged alternately every half cycle of the AC power supply 1, and the sum of the charged voltages of these capacitors is supplied to the inverter device 9. Therefore, it is assumed that the first embodiment shown in FIG. 1 uses a full-wave rectifier circuit and has an inverter device 9 corresponding to the output voltage on the premise that drive power is obtained from a 200 V AC power supply. For example, there is an advantage that the inverter device 9 can be commonly used by using the voltage doubler rectifier circuit shown in FIG.

Thus, also in the second embodiment shown in FIG. 2, the leakage current caused by the rapid change of the ground voltage waveform due to the high power factor pulse of the high power factor circuit can be suppressed low. Further, since the leakage current compensating circuit includes the independent DC power supply circuit, the leakage current can be compensated stably.

FIG. 3 is a partial circuit diagram showing the configuration of a third embodiment of the compressor driving device for an air conditioner according to the present invention. In this configuration, a portion surrounded by a broken line in the second embodiment shown in FIG. 2 is replaced with a leakage current compensation circuit. FIG. 3 shows a diode 11a and a diode 11b.
13a and 13
The series connection circuit b is connected in parallel to form a voltage doubler rectifier circuit in the same manner as the main circuit system, and the output thereof drives the push-pull amplifier circuit. According to this configuration, since the neutral point of the DC power supply of the leakage current compensation circuit is fixed with respect to the ground point, more stable compensation of the leakage current becomes possible.

In the embodiments shown in FIGS. 1 and 2, when all of the diodes 11a to 11d constituting the DC power supply circuit of the leakage current compensating circuit are in the off state,
That is, the DC power supply circuit is in a high impedance state with respect to the ground point while the charging of the smoothing capacitor 12 is not performed. When the leakage current compensating circuit operates in this state, the ground impedance of the DC power supply is in a low impedance state, and rapidly changes to a certain voltage according to the state of the AC power supply voltage. When the leakage current compensating circuit stops its operation, the impedance of the DC power supply to the ground returns to the high impedance state. Therefore, the operation of the leakage current compensation circuit,
The non-operation may cause a sudden change in the ground voltage of the DC power supply. Therefore, when low-speed diodes are used as the diodes 11a to 11d, a state may occur in which the compensation current cannot follow the leakage current. Therefore, by using high-speed diodes as the diodes 11a to 11d, leakage current can be more reliably compensated.

The high-speed diode (diode having a high response speed) has a sufficiently short reverse recovery time with respect to one cycle period of the output frequency of the inverter device 9.
For example, when the output frequency of the inverter device 9 is 20 kHz, one having a frequency of 50 μsec or less, generally 0.5 μsec or less is used. On the other hand, a slow diode (a diode having a slow response speed) corresponds to a diode having a reverse recovery time longer than 50 μsec.

FIG. 4 is a circuit diagram showing the configuration of a fourth embodiment of the compressor driving device for an air conditioner according to the present invention. In the figure, the same elements as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In the first embodiment shown in FIG. 1, the low-pass filter 7 is provided between the full-wave rectifier circuit composed of the diodes 3a to 3d and the smoothing capacitor 8 for smoothing the output voltage. Oscillation occurs when the compensation current of the circuit flows in the power supply path before the low-pass filter 7, the current component is detected by the coil 7 c of the low-pass filter 7, and the compensation current flows according to the detected value. May cause.

In the embodiment shown in FIG. 4, a low-pass filter 7 is connected between the AC power supply 1 and the reactor 2 in order to prevent this oscillation phenomenon. With this configuration, it is possible to prevent a situation in which the zero-phase current detection unit detects the compensation current again, and thus it is possible to surely compensate for the leakage current.

FIG. 4 shows a state in which the compressor 10 is fixed to the housing 21, a leakage current compensation circuit supplies a compensation current to the housing 21, and the housing 21 is grounded. here,
The leakage current flowing from the compressor 10 to the housing 21 is i ₁ , the compensation current flowing to the housing 21 via the resistor 19 and the capacitor 20 is i ₂ , and the current flowing from the housing 21 to the ground is i ₃
Then, between these currents, FIG. 5 (a), (b),
There is a relationship shown in FIG. That is, the leakage current i ₁ and the compensation current i ₂ are offset and the current flowing from the housing 21 to the ground point, that is, the leakage current i caused by the rapid change of the ground voltage waveform due to the high power factor pulse of the high power factor circuit. It can be seen that ₃ is substantially suppressed to zero.

FIG. 6 is a circuit diagram showing the configuration of a fifth embodiment of the compressor driving device for an air conditioner according to the present invention. In the figure, the same elements as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In the first embodiment shown in FIG. 1, a full-wave rectifier circuit is used as a DC power supply circuit for operating a leakage current compensation circuit. However, in this embodiment, a half-wave rectifier circuit is used instead of a full-wave rectifier circuit. The configuration is different from FIG.

That is, the anode of the diode 11a is connected to the load side of the reactor 2 connected to one end of the AC power supply 1, and the cathode of the diode 11b is connected to the other end of the AC power supply 1. Further, a smoothing capacitor 12 is connected between the cathode of the diode 11a and the anode of the diode 11b, and the operating voltage of the push-pull amplifier circuit is supplied from the smoothing capacitor 12. In this case, the charging of the smoothing capacitor 12 is performed only in a half cycle in which one end of the AC power supply 1 becomes positive, so that the compensable current is reduced as compared with the case of using the full-wave rectifier circuit, but the number of parts is reduced. There is an advantage that the leakage current can be compensated with a cheap and inexpensive configuration.

[0043]

As is apparent from the above description, according to the present invention, a compressor of an air conditioner capable of suppressing a leakage current caused by a rapid change of a ground voltage waveform due to a high power factor pulse can be suppressed. A drive is obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a first embodiment of a compressor driving device for an air conditioner according to the present invention.

FIG. 2 is a circuit diagram showing a configuration of a second embodiment of a compressor driving device for an air conditioner according to the present invention.

FIG. 3 is a partial circuit diagram illustrating a configuration of a third embodiment of a compressor driving device for an air conditioner according to the present invention.

FIG. 4 is a circuit diagram showing a configuration of a fourth embodiment of a compressor driving device for an air conditioner according to the present invention.

FIG. 5 is a current waveform diagram for explaining a leakage current compensation operation according to the fourth embodiment shown in FIG. 4;

FIG. 6 is a circuit diagram showing a configuration of a fifth embodiment of a compressor driving device for an air conditioner according to the present invention.

FIG. 7 is a circuit diagram showing a configuration of a conventional compressor driving device for an air conditioner.

FIG. 8 is a voltage waveform diagram for explaining the operation of the compressor driving device of the air conditioner shown in FIG. 7 and the reason why a leakage current flows.

[Explanation of symbols]

1 AC power supply 2 Reactor 3a-3d, 4a, 4b, 11a-11d, 16, 17
Diode 5 Transistor 6a, 6b, 13a, 13b, 20 Capacitor 7 Low-pass filter 7a, 7b, 7c Coil 8, 12 Smoothing capacitor 9 Inverter device 10 Compressor driving motor 14 NPN transistor 15 PNP transistor 18, 19 Resistor 21 Housing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) H02M 7/48 H02M 7/48 M (72) Inventor Tetsuji Yamashita 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation Inside the Fuji Plant (72) Inventor Yui Igarashi, 336 Tatehara, Fuji, Shizuoka Prefecture Inside the Toshiba Fuji Plant (72) Inventor Hidetoshi Kanazawa 336 Tatehara, Fuji City, Shizuoka Prefecture Inside the Toshiba Fuji Plant (72) Inventor Mori Hiroyoshi Moto 3-3-9, Shimbashi, Minato-ku, Tokyo F-term in Toshiba Abu E Co., Ltd. 3H045 AA09 AA27 BA28 BA30 BA41 CA21 CA29 DA07 EA34 5H007 AA01 AA07 BB06 CA02 CB02 CB05 CC12 DA05 DC02 EA02 HA02 5H576 AA10 BB05 CC05 DD02 DD04 EE11 HA02 HA03 HA10 HB01 HB10 LL22

Claims (9)

[Claims] 1. A first power conversion means for converting an AC voltage from an AC power supply into a DC voltage, and a DC voltage converted by the first power conversion means into an AC voltage to convert the DC voltage into an AC voltage. A second power conversion means for supplying an electric motor; and a reactor connected in series between the AC power supply and the first power conversion means, wherein one or more of the AC power supply after passing a zero point A predetermined period, a high power factor means for short-circuiting the AC power supply via the reactor, and a zero-phase current detecting means for detecting a zero-phase current of a main circuit system to which drive power is supplied to the electric motor; Leak current compensating means for flowing a current having substantially the same magnitude and opposite polarity as the leakage current leaking from the electric motor to the ground point based on the detection value of the current detecting means to the ground point. Machine drive. 2. The full-wave rectifier circuit for full-wave rectifying an AC voltage from the AC power supply, and a smoothing capacitor for smoothing an output of the full-wave rectifier circuit. 2. The compressor driving device for an air conditioner according to 1. 3. The air conditioner compressor drive apparatus according to claim 1, wherein said first power conversion means includes a voltage doubler rectifier circuit for voltage doubler rectifying an AC voltage from said AC power supply. 4. The leakage current compensating means includes: third power converting means for converting an AC voltage from an AC power supply into a DC voltage; and the DC voltage converted by the third power converting means as an operating power supply. 2. A push-pull amplifier for flowing an amplified current of a detection value of the phase current detection means to a ground point.
4. The compressor drive device for an air conditioner according to any one of claims 3 to 3. 5. A full-wave rectifier circuit for full-wave rectifying an AC voltage from the AC power supply, and a smoothing capacitor for smoothing an output of the full-wave rectifier circuit. 5. The compressor driving device for an air conditioner according to 4. 6. A compressor driving device for an air conditioner according to claim 5, wherein said third power conversion means uses a high-speed diode as a rectifying element. 7. The air conditioner compressor drive device according to claim 4, wherein said third power conversion means includes a voltage doubler rectifier circuit for voltage doubler rectifying an AC voltage from said AC power supply. 8. The air conditioner compressor drive apparatus according to claim 4, wherein said third power conversion means includes a half-wave rectifier circuit for half-wave rectifying an AC voltage from said AC power supply. 9. The compressor drive device for an air conditioner according to claim 1, wherein said zero-phase current detection means is provided on said AC power supply side relative to said leakage current compensation means.