JPH07177676A - Charging emthod for battery - Google Patents

Abstract

PURPOSE:To provide a charging method for battery in which the price can be lowered significantly by simplifying the charging circuit. CONSTITUTION:When a battery is charged by a power generating unit comprising a power converter for converting the output from a generator into a desired AC power and taking out an output from the power converter through a smoothing circuit, charging power is taken out through a controllable rectifying circuit 31 inserted into the output circuit of the power converter 5 and a the variable control circuit is driven with the ON/OFF signal of one arbitrary phase for driving the power converter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a power converter for converting the output of a generator into desired AC power, and charging the battery from a power generator that takes out the output of the power converter through a filter circuit. Regarding the method.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional portable engine-type power generator. In the figure, 1
Is a fuel tank, 2 is a fuel supply device (injector), 3
Is a gas turbine engine (hereinafter, simply referred to as engine) E, 4 is a magnet type three-phase synchronous generator (hereinafter, simply referred to as generator) SG, and 5 is a power converter. The AC output of this power converter 5 is the reactor Lo and the capacitor C.
It is output through a filter circuit consisting of o. The power conversion device 5 includes a forward conversion unit 6, a capacitor 7, and an inverse conversion unit 8. The output terminals 9u and 9w are connected to a 100-volt or 200-volt outlet.

The generator 4 has a main winding 4P on the high voltage side and an auxiliary winding 4S on the low voltage side, and the main winding 4P is connected to the power converter 5. The electric power generated by the auxiliary winding 4S is used as electric power for auxiliary equipment such as the fan and the fuel supply device 2. Main winding 4
The generated voltage of P is Vp. Further, the voltage Vs generated by the auxiliary winding S is taken into the rotation speed detector 20 and is used to detect the rotation speed of the generator 4. The detected rotation speed N is compared with the rotation speed command N ^*, and the deviation is detected by the deviation amplifier 21.
Is supplied to the fuel supply device 2 through the control unit and the fuel supply device 2 is controlled so that the above deviation is eliminated.

As shown in FIG. 4, the forward conversion section 6 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. As shown in FIG. 4, the inverse converter 8 has four bridge-connected transistors T _{r1 to} T _r4 and four anti-parallel connected diodes D _{7 to} D ₁₀ , respectively. There is.

Reference numeral 10 is a battery for an engine starter having a nominal voltage of 12 volts or 24 volts, which is connected via a step-down circuit (step-down chopper circuit) 11 between the positive and negative electrodes of the DC circuit of the power converter 5. There is. 10A indicates the internal resistance r of the battery, and 10B indicates the battery voltage V _B. The step-down chopper circuit 11 includes a chopper element 12, a reactor 13, and a diode 14. Reference numeral 15 denotes a charge control circuit, which compares a charging current I _B detected by the current sensor DCCT 16 with a charging current command value I _B ^* and amplifies the deviation, a deviation amplifier 17, and a PWM signal generator 18 for generating a PWM signal. The chopper element 12 is controlled by applying this PWM signal to the base of the chopper element 12 via the switch 19A. This switch 19A is opened except when charging.

In this apparatus, when the engine 3 is started, the switch SW is closed, the battery 10 is connected to the main circuit, and one of the transistors and one of the diodes forming the inverse converter 8 and the reactor L of the filter circuit are connected.
By using o, a booster circuit is formed, the voltage of the battery 10 is boosted, and the forward conversion unit 6 is operated in reverse conversion to drive the generator 4 as a motor.

After the start of the engine 3 is completed, the battery 10 charges the battery 10 by opening the switch SW and operating the step-down circuit (step-down chopper circuit) 11.

[0008]

Since this type of portable engine-type power generator is required to be as inexpensive as possible, the number of parts can be reduced as much as possible and inexpensive parts can be used. However, in the case where the charging power is obtained from the power conversion device 5 as described above, an expensive step-down circuit (step-down chopper circuit) 11 is naturally used, which occupies the cost of the entire circuit device. The proportion of the charging circuit became large, which was a bottleneck for cost reduction.

The present invention has been made to solve this problem, and an object of the present invention is to provide a battery charging method in which the charging circuit can be simplified and the price thereof can be significantly reduced as compared with the conventional case. And

[0010]

In order to achieve the above object, the present invention provides a power converter for converting the output of a generator into desired AC power, and filters the output of the power converter according to claim 1. When the battery is charged by using the power generation device taken out through the circuit as the battery charging power source, the charging power is taken out through the controllable rectification circuit inserted in the output circuit of the power conversion device, and the controllable rectification circuit is The power converter is driven by an ON / OFF signal of any one phase of the ON / OFF signal for driving.

In the second aspect, the charging current is controlled by controlling the rotation speed of the generator.

According to a third aspect of the present invention, the generator is a gas turbine engine as a prime mover, the generator is a motor driven when the engine is started, and the battery is a starter battery that serves as a power source at the start.

According to a fourth aspect of the present invention, a charging speed command is given when the battery is charged.

[0014]

In the present invention, the controllable rectifier circuit inserted in the output circuit of the power converter performs a step-down action, and the drive of this controllable rectifier circuit is turned on / off to the power converter.
Since the signal is used, a control circuit dedicated to charging is unnecessary.

[0015]

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

In FIG. 1, reference numeral 30 is a control circuit for supplying an ON / OFF signal to the inverse converter 8 of the power converter 5. 31 is a thyristor or another semiconductor switching element, constitute a half-wave rectifier circuit, the anode side is connected to one end of the capacitor C _o. Battery 1
The positive electrode side of 0 is connected to the semiconductor switching element 31 via the reactor 32. In the present embodiment, the control circuit 30 supplies a PWM signal (ON / OFF signal, FIG. 2B) to the transistor T _r1 through a driver (not shown).
Are also supplied to the gate of the semiconductor switching element 31. 33 is a diode. Also, switch S
W is connected in parallel to the series circuit of the semiconductor switching element 31 and the reactor 32. Also, the switch SW1
Is inserted between the gate and the control circuit 30 in order to turn on / off the gate signal input to the semiconductor switching element 31.

The charging current I _B detected by the current sensor DCCT16 is compared with the charging current command value I _B ^* ,
The output of the deviation amplifier 17 for amplifying the deviation is the adder 34.
Is added to the charging speed command value N _B ^* . The deviation amplifier 21 calculates the deviation between the output N of the rotation speed detector 20 and the output of the adder 34. Since other configurations are the same as those of the conventional one, they are denoted by the same reference numerals. Note that the reference symbols P,
N indicates the positive electrode and the negative electrode of the capacitor 7, and the symbol O indicates the connection point between the reactor Lo of the filter circuit and the capacitor Co.

In this apparatus, when the engine 3 is started, the switch SW is closed, the switch SW1 is opened, the battery 10 is connected to the main circuit, and one of the transistors and one of the diodes constituting the inverse conversion unit 8 and one of the diodes are connected. The reactor Lo of the filter circuit is used to form a booster circuit, which boosts the voltage of the battery 10 and causes the forward conversion unit 6 to perform a reverse conversion operation to operate the generator 4 as a motor.

After the start of the engine 3 is completed, the switch SW is opened, the switch SW1 is closed, and the power conversion device 5 is driven.

That is, after the start of the engine 3 is completed,
The forward conversion unit 6 of the power conversion device 5 is operated for forward conversion to rectify the output of the generator 4, and the inverse conversion unit 8 is operated as an inverter (P
(By WM control), the voltage v _vu shown in FIG. 2C is extracted from the power conversion device 5. At the base of the transistor T _r1 or T _r3 , P shown in FIG.
The WM signal or its inverted signal is supplied through a driver (not shown), and the PWM signal shown in FIG. 2A is supplied through a driver (not shown) to the bases of the transistors T _r2 and T _r4 . The filter circuit including the reactor Lo and the capacitor Co attenuates the harmonic component contained in the voltage v _vu and outputs the voltage v _C shown in (D) of FIG. The applied voltage v _LO of the reactor L _O is shown in FIG.

At this time, since the ON / OFF signal shown in FIG. 2B is supplied to the gate of the semiconductor switching element 31, the semiconductor switching element 31 turns ON / OFF in synchronization with the transistors T _r1 and T _r4. And reactor 32
A voltage v _BN obtained by half-wave rectifying the A portion of the _ON -N voltage v _ON shown in (F) of FIG. 2 is applied to the series circuit (between B and N) of the battery 10. If the battery voltage is v _B and the inductance value of the reactor 32 is L, And will, on average, becomes the following equation.

[0022]

The magnitude of this charging current I _B is can be controlled by adjusting the size of the half-wave rectified voltage v _BN, in the present embodiment, given a rotational speed for when the charge instruction N _B ^*,
During charging, controls the fuel supply device 2 such that the rotational speed N = N _B of the generator 4 ^*, adjusted to adjust the size of the half-wave rectified voltage v _BN the rectified voltage v _Dc forward converter 6 To do.

As described above, in the present embodiment, the controllable rectifier circuit connected to the output circuit of the power conversion device 5 steps down the voltage and extracts it, and the drive of the controllable rectification circuit is given to the power conversion device 5. Since the / OFF signal is used, a circuit for voltage reduction control dedicated to charging is unnecessary.

Further, since the charging current I _B is also controlled by controlling the rotation speed of the generator 4, a dedicated circuit for controlling the charging current becomes unnecessary.

[0026]

As described above, the present invention extracts the charging voltage from the output circuit of the power converter through the controllable rectifier circuit, and controls the controllable rectifier circuit by sharing the ON / OFF signal of the power converter. Therefore, it is possible to omit the circuit for step-down control dedicated to charging, and correspondingly reduce the number of parts and the cost.

[Brief description of drawings]

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

FIG. 2 is a waveform diagram for explaining the operation of the above embodiment.

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

FIG. 4 is a circuit diagram of a forward conversion unit and an inverse conversion unit in the above conventional engine-type power generator.

[Explanation of symbols]

 1 Fuel Tank 2 Fuel Supply Device 3 Gas Turbine Engine 5 Power Converter 6 Forward Converter 7 Capacitor 8 Inverse Converter 10 Battery 15 Charging Control Circuit 17 Deviation Amplifier 30 Control Circuit 31 Controllable Rectifier Circuit 32 Reactor 34 Adder

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[Procedure amendment]

[Submission date] March 6, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional portable engine-type power generator. In the figure, 1
Is a fuel tank, 2 is a fuel supply device (injector), 3
Is a gas turbine engine (hereinafter, simply referred to as engine) E, 4 is a magnet type three-phase synchronous generator (hereinafter, simply referred to as generator) SG, and 5 is a power converter. The AC output of this power converter 5 is the reactor Lo and the capacitor C.
It is output through a filter circuit consisting of o. The power conversion device 5 includes a forward conversion unit 6, a capacitor 7, and an inverse conversion unit 8. 9u and 9 v is an output terminal which is connected to a 100 volt or 200 volt outlet.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

The generator 4 has a main winding 4P on the high voltage side and an auxiliary winding 4S on the low voltage side, and the main winding 4P is connected to the power conversion device 5. The electric power generated by the auxiliary winding 4S is used as electric power for auxiliary equipment such as the fan and the fuel supply device 2. The generated voltage of the main winding 4P is Vp. Further, the voltage Vs generated by the auxiliary winding S is taken into the rotation speed detector 20 and is used to detect the rotation speed of the generator 4. Detected rotation speed N
Is compared with the rotation speed command N ^*, and the deviation is detected by the deviation amplifier 2
1 to the fuel supply device 2 and controls the fuel supply device 2 so that the above deviation is eliminated.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The charging current IB detected by the current sensor DCCT16 is compared with the charging current command value IB ^* ,
The output of the deviation amplifier 17 for amplifying the deviation is the adder 34.
Is added to the rotation speed command value N ^* . The deviation amplifier 21 calculates the deviation between the output N of the rotation speed detector 20 and the output of the adder 34. Since other configurations are the same as those of the conventional one, they are denoted by the same reference numerals. The symbols P and N indicate the positive and negative electrodes of the capacitor 7, and the symbol O indicates the connection point between the reactor Lo of the filter circuit and the capacitor Co.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

At this time, since the ON / OFF signal shown in FIG. 2B is supplied to the gate of the semiconductor switching element 31, the semiconductor switching element 31 is turned ON / OFF in synchronization with the transistors T _r1 and T _r4. Then, in the series circuit (between B and N) of the reactor 32 and the battery 10, a voltage v _B-N obtained by half-wave rectifying the A portion of the _O-N voltage v _O-N shown in (F) of FIG. Is applied. Battery voltage is V
_B, and the inductance value of the reactor 32 and _{L, v B-N = L} · d / dt · I B + r B · I B + v B ········· (1) , and the On average , Becomes like the following formula.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

[0022]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (4)

[Claims] 1. When charging a battery using a power conversion device that converts an output of a power generator into a desired AC power, and a power generation device that takes out the output of the power conversion device through a filter circuit as a battery charging power supply, The charging power is taken out through a controllable rectifier circuit inserted in the output circuit of the power converter, and the controllable rectifier circuit turns on / off any one phase of an ON / OFF signal that drives the power converter. A battery charging method characterized by being driven by a signal. 2. The method for charging a battery according to claim 1, wherein the charging current is controlled by controlling the rotation speed of the generator. 3. The generator is a gas turbine engine as a prime mover, is a generator driven by an electric motor when the engine is started, and the battery is a starter battery that serves as a power source at the start. Alternatively, the battery charging method described in 2. 4. The method for charging a battery according to claim 1, wherein a charging speed command is given when charging the battery.