JPH0614600A - Engine type generator - Google Patents

Abstract

PURPOSE:To provide an engine type generator wherein the cost of its engine starter part is reduced. CONSTITUTION:An engine type generator 2 has a main winding and an auxiliary winding for taking out power for auxiliary devices, and its output is charged in a battery 9. At the time of starting an engine, the battery 9 supplies power to the generator 2 which, in turn, operates as a motor. The voltage of the battery 9 is converted into AC power by a converter 13A to supply the AC power to the auxiliary winding at the time of starting the engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-type power generator in which a generator is a generator having a main winding and an auxiliary winding for extracting electric power for auxiliary machinery.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional engine-type power generator. In the figure, 1 is an engine,
Reference numeral 2 is a magnet-type three-phase synchronous generator (hereinafter, simply referred to as generator) SG, 3 is a power converter having a forward converter 4, an electrolytic capacitor 5 and a reverse converter 6, and its AC output. Are supplied to the load 7. Reference numeral 8 denotes a boost chopper circuit that boosts the voltage of the battery 9, and includes a chopper element 10, a diode 11 and a reactor 12.

As shown in FIG. 4, the generator 4 has a main winding P on the high voltage side and an auxiliary winding S on the low voltage side, and the main winding P is connected to the power converter 3. The voltage Vs generated by the auxiliary winding S is converted into a direct current by the diode rectifier 13 and then supplied to the auxiliary device 14. The voltage ratio between the voltages Vp and Vs is, for example, about 7: 1.

As shown in FIG. 5, the forward conversion section 4 has six transistors Q _{1 to} Q ₆ which are bridge-connected and diodes D _{1 to} D ₆ which are respectively connected in anti-parallel to each other. In addition, as shown in FIG. 4, the inverse conversion unit 6 has four transistors T _{r1 to} T _r4 connected in a bridge and four diodes D _{7 to} D ₁₀ connected in anti-parallel to each of them. There is. Lo is a reactor, Co is a capacitor,
Both form a filter circuit.

In this apparatus, when the engine 1 is started, the boost chopper circuit 8 is driven to boost the voltage of the battery 9 and the transistor Q _{1 of the} forward converter 4 is also used.
To Q ₆ is reversely converting operation the driving motor generator 2.

After the engine 1 reaches a predetermined speed, the reverse conversion operation of the forward conversion unit 4 is stopped and the generated voltage V of the generator 2 is stopped.
After rectifying p by the diode bridge of the forward conversion unit 4, the inverse conversion unit 6 converts it into alternating current.

The battery 9 is charged from the generator 2 by a charging circuit (not shown).

[0008]

An engine-type power generator,
In particular, the portable type is required to have a fixed price as much as possible, so it is designed to reduce the number of parts as much as possible and to use inexpensive parts. At this time, since a voltage is applied to the main winding P of the generator 2 to operate the generator 2 as a motor, a boost chopper circuit 8 for boosting the battery voltage V _B is required.

The present invention has been made to solve this problem, and an object of the present invention is to provide an engine-type power generator which can reduce the cost of the engine starter portion.

[0010]

In order to achieve the above object, the present invention is directed to a generator having a main winding and an auxiliary winding for extracting electric power for auxiliary machinery. In an engine-type power generation device that includes a battery that is charged by using the battery, and uses the battery as a power source to drive the generator as a motor when the engine is started, the voltage of the battery is AC-converted by a converter when the engine is started. It is configured to supply to the winding.

[0011]

According to the present invention, when the engine is started, the converter connected to the auxiliary winding converts the voltage of the battery to AC and supplies the AC voltage to the auxiliary winding.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the forward conversion unit 4A of the power conversion device 3 is a diode rectifier which is a bridge circuit of six diodes, and which converts the voltage Vs generated by the auxiliary winding S into DC, the diode rectifier 13 of FIG. instead, are used as Q ₁₁ to Q ₆₆ was transistors of the bridge-connected 6箇, a forward converter 13A comprises a diode D ₁₁ to D ₆₆ which are connected in antiparallel, respectively. Battery 9 is switch 15
Is connected between the DC side terminals of the forward converter 13A via. Reference numeral 16 is a switch for connecting and disconnecting the auxiliary machine 14.

In this device, when the engine 1 is started, the switch 15 is closed and the battery voltage V _B is directly applied to the forward converter 13A, and the forward converter 13A is applied.
The transistors Q _{11 to} Q ₆₆ are driven by an inverter by PWM control.

Therefore, in this embodiment, the battery voltage V _B
Need not be boosted and need not be boosted.

In this embodiment, since the low voltage AC voltage output from the forward converter 13A is applied to the auxiliary winding S of the generator 2, a large current is supplied to the auxiliary winding S, but the loss is lost. There is no problem because a switching element (FET or the like) for a large current with less power consumption is commercially available.

[0017]

As described above, according to the present invention, when the generator is operated by the electric motor and the engine is started, electric power is supplied not to the main winding of the generator but to the auxiliary winding. Therefore, it is necessary to boost the battery voltage. Since there is no need for a booster circuit, which is conventionally required, the cost required for the engine starter portion can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of a forward converter in the above embodiment.

FIG. 3 is a configuration diagram of a conventional engine-type power generator.

FIG. 4 is a diagram showing a winding structure of a generator in the conventional engine-type power generator.

FIG. 5 is a circuit diagram of a forward conversion unit and an inverse conversion unit in the above conventional engine-type power generator.

[Explanation of Codes] 1 gas turbine engine 2 generator 3 power converter 4A forward converter 5 electrolytic capacitor 6 inverse converter 9 battery 13A forward converter 15, 16 switch P main winding S auxiliary winding

Claims (1)

[Claims] 1. A generator is a generator having a main winding and an auxiliary winding for extracting electric power for auxiliary machinery, and includes a battery charged using the electric power of the generator, and at the time of engine start,
In an engine-type power generator that uses the battery as a power source to drive the generator as an electric motor, when the engine is started, the voltage of the battery is AC-converted by a converter and supplied to the auxiliary winding. apparatus.