JP3151130B2 - Step-up chopper circuit of ± 2 DC power supply of half-bridge type inverter sharing battery power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step-up chopper circuit of ± 2 DC power supplies of a half-bridge type inverter constituting a UPS.

[0002]

2. Description of the Related Art As means for supplying ± 2 DC power from a battery to a boost chopper circuit of a half-bridge type inverter, the methods shown in FIGS. 3, 4 and 5 are used. FIG. 3 shows an example in which a polarity inversion chopper circuit is used. A single battery 101 is disposed in a positive power supply of a step-up chopper circuit of a half-bridge type inverter, and the battery 101 is operated by operating the polarity inversion chopper circuit 100. Is supplied to the minus power supply. That is, when the switching element 104 is turned on, the energy stored in the reactor 105 becomes smaller when the switching element 104 is turned off.
Since the light is discharged through the capacitor 107 to the diode 106, the output voltage from the battery 101 is inverted. At this time, when the switching element 113 is switched at a high frequency, the energy stored in the capacitor 107 and the reactor 111 is supplied to the minus power supply. Further, since the switching element 112 is always connected to the positive power supply of the battery 101, the high frequency switching can supply the stored energy of the battery 101 and the reactor 110 to the positive power supply.

FIG. 4 shows an example in which a step-up / step-down chopper circuit is used. When a switching element 125 is turned on, energy from a battery 120 is supplied to a reactor 12.
3 and 124. When the switching element 125 is turned off, the stored energy of the reactor 123 is released through the diode 127 to the capacitor 129 to supply a positive power to the inverter, while the stored energy of the reactor 124 is changed to the capacitor 130 to the diode 128
And supply negative power to the inverter.

FIG. 5 shows an example in which a battery is divided and dedicated batteries are provided for a positive power supply and a negative power supply, respectively. Two sets of batteries each having an overdischarge prevention switch and a fuse are provided. . The positive power is supplied from the battery 150 by switching the switching element 158 at a high frequency, and the switching element 159 is switched at a high frequency to the battery 151.
To supply minus power.

[0005]

The above-mentioned conventional method of supplying two ± DC power supplies from a battery has the following disadvantages. In the method shown in FIG. 3, it is necessary to install a polarity inversion chopper circuit, and in the method shown in FIG. 4, since the limit of the boosting degree in the step-up / step-down chopper circuit is low, the number of series-connected batteries is increased to increase the battery voltage. It is necessary to use a switching element having a high withstand voltage. Further, in the method shown in FIG. 5, it is necessary to provide a battery overdischarge prevention switch and a protection fuse for each battery.
In order to divide the battery into two, it is necessary to increase the boosting degree in the boosting chopper circuit. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a step-up chopper circuit of ± DC 2 power supply using a single battery which is small and lightweight and can use an inexpensive switching element. It is assumed that.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a battery for a half-bridge type inverter sharing a battery power source is provided.
The step-up chopper circuit of the DC two power supply is configured to connect a series circuit including a first semiconductor switch and a second semiconductor switch in parallel between both pole terminals of a single battery power supply, and to connect the first semiconductor switch and the second semiconductor switch to each other. A half-bridge is connected by connecting a series connection point with a semiconductor switch to a neutral line of the boost chopper circuit, and further connecting both bipolar terminals of the single battery power supply to power supply lines of the same polarity in the boost chopper circuit. Type inverter ± DC2
A power supply boost chopper circuit is configured, and the first and second semiconductor switches are alternately turned on and off every half cycle to supply a single battery power supply alternately to a ± DC2 power supply boost chopper circuit, The present invention is adapted to cope with a change in the polarity of the AC voltage waveform output from the inverter.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a circuit configuration of a step-up chopper circuit of ± DC 2 power supply of a half-bridge type inverter sharing a battery power supply. In FIG. 1, an overdischarge prevention switch 6 and a protection fuse 7 are connected to the positive pole side of a single battery 5, and a connection point between a diode 13 and a protection fuse and a connection point between a negative pole of the battery 5 and a diode 14. Between them, a series circuit of the first semiconductor switch 1 and the second semiconductor switch 2 is connected in parallel. Each of the first semiconductor switch 1 and the second semiconductor switch 2 is constituted by an FET having a diode bypass circuit. The series connection point of the two semiconductor switches 1 and 2 is connected to the neutral line of the inverter 10. Connected.

A series circuit of the reactor 8 and the diode 15 is connected between the diode 13 and the positive power supply terminal of the inverter 10, and a series circuit of the reactor 9 and the diode 16 is connected between the diode 14 and the negative power supply terminal of the inverter 10. Connected. Also, the reactor 8
A third switching element 3 is connected in parallel between the connection point of the diode 15 and the neutral line, and a fourth switching element 4 is connected between the connection point of the reactor 9 and the diode 16 and the neutral line. Are connected in parallel. In addition, inverter 1
At 0, a capacitor 11 is connected between the positive power supply terminal and the neutral power supply terminal, and a capacitor 12 is connected between the neutral power supply terminal and the negative power supply terminal in parallel to form a step-up chopper circuit of a half-bridge type inverter. I have.

When the AC voltage waveform output from the inverter 10 has a positive half-wave, it is necessary to supply a positive power from the step-up chopper circuit to the inverter 10, and when it has a negative half-wave, it is necessary to supply a negative power. Therefore, when the second semiconductor switch 2 is turned on and the first semiconductor switch 1 is turned off, the positive pole of the battery 5 is connected to the overdischarge prevention switch 6, the protection fuse 7, the diode 13, the reactor 8,
The diode 15 is connected to the positive power supply terminal of the inverter 10, and the negative pole of the battery 5 is connected to the neutral line of the inverter 10 via the second semiconductor switch 2. When the first semiconductor switch 1 is turned on and the second semiconductor switch 2 is turned off, the negative pole of the battery 5 is connected to the diode 14, the reactor 9, the diode 16
Is connected to the negative power supply terminal of the inverter 10, and the positive pole of the battery 5 is connected to the neutral wire of the inverter 10 via the overdischarge switch 6, the protective fuse, and the first semiconductor switch 1.

FIG. 2 is a waveform diagram showing the operating characteristics of the switching elements constituting the boost chopper circuit described above. FIG. 2A shows an output voltage waveform of the inverter 10, and FIG.
2 (b) and FIG. 2 (c) show the operating characteristics of the second semiconductor switch 2 and the first semiconductor switch 1, and FIGS. 2 (d) and 2 (e) show the third switching element 3 and the third semiconductor switch 2. 4 shows the operating characteristics of the switching element 4. When the output voltage waveform of the inverter is a positive half wave, the second semiconductor switch 2
Is ON, the first semiconductor switch 1 is OFF, and the ON and OFF of the first semiconductor switch 1 and the second semiconductor switch 2 are reversed during the period when the output voltage waveform of the inverter is a negative half-wave. Therefore, when the third switching element 3 is switched at a high frequency while the second semiconductor switch 2 is on, + DC power is supplied to the inverter 10, and the inverter 10 outputs a positive voltage waveform. When the high frequency switching of the fourth switching element 4 is performed while the first semiconductor switch 1 is on, the inverter 10
The negative DC power is supplied, and the inverter 10 outputs a negative voltage waveform. That is, the first semiconductor switch 1 and the second semiconductor switch 2 are alternately turned on and off by half waves in accordance with the output voltage waveform of the inverter 10 so that the power supply of the single battery 5 is changed to two ± DC power supplies. To the boost chopper circuit.

[0011]

As described above, according to the present invention, the step-up chopper circuit of ± DC 2 power supply of the half-bridge type inverter sharing the battery power supply has the same polarity to the positive power supply terminal and the negative power supply terminal in the booster chopper circuit, respectively. A series circuit composed of first and second semiconductor switches is connected in parallel to a single battery power supply to which the terminals of the boost chopper circuit are connected.
And a second semiconductor switch connected in series. Since the above-mentioned first and second semiconductor switches are alternately turned on and off, ± DC2 power can be supplied from a single battery power supply to the step-up chopper circuit of the half-bridge inverter, so that a simple circuit configuration is provided. Inexpensive boost chopper circuit can be realized. In addition, since the switching elements used in the boost chopper circuit operate only during a half-wave period, an inexpensive switching element that consumes half the output power may be used. That is, the step-up chopper circuit of ± 2 DC power supplies according to the present invention has a small number of component parts and can use an inexpensive switching element. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a step-up chopper circuit of ± DC2 power supply according to the present invention.

FIG. 2 is a waveform diagram.

FIG. 3 is a block diagram showing a configuration of a step-up chopper circuit having two ± DC power supplies according to the related art.

FIG. 4 is a block diagram showing a configuration of a step-up chopper circuit having two ± DC power supplies according to the related art.

FIG. 5 is a block diagram showing the configuration of a conventional DC / DC dual power supply step-up chopper circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st semiconductor switch (FET) 2 2nd semiconductor switch (FET) 3 3rd switching element 4 4th switching element 5 Battery 6 Overdischarge prevention switch 7 Protection fuse 8, 9 Reactor 10 Inverter 11, 12 Capacitor 13,14,15,16 Diode

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-7-303337 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02M 7/48 H02M 3/155

Claims (2)

(57) [Claims] 1. A step-up chopper circuit of ± 2 DC power supplies constituting an input power supply circuit of a half-bridge type inverter, comprising: a series circuit comprising a first semiconductor switch and a second semiconductor switch; And a series connection point of the first semiconductor switch and the second semiconductor switch is connected to a neutral wire in the boost chopper circuit, and furthermore, a bipolar terminal of the single battery power supply is connected to the A step-up chopper circuit of ± 2 DC power supplies of a half-bridge type inverter is formed by connecting to a power supply line of the same polarity in the step-up chopper circuit, and the first semiconductor switch and the second semiconductor switch are connected to an output voltage waveform of the inverter. ON / OFF control alternately for each half cycle of the single battery power source to increase the Is supplied to the path circuit, ± DC 2 power boost chopper circuit of the half-bridge type inverter shares the battery power, characterized in that so as to correspond to the change in the output voltage waveform of the inverter. 2. A step-up chopper circuit comprising: a third switching element connected in parallel between a positive power supply line and a neutral line in a step-up chopper circuit for high-frequency switching in synchronization with an ON period of a second semiconductor switch; The fourth connected in parallel between the neutral wire and the negative power wire in
2. The step-up of ± 2 DC power supplies of a half-bridge type inverter sharing a battery power supply according to claim 1, wherein the high-frequency switching is performed in synchronization with the ON period of the first semiconductor switch. Chopper circuit.