JPS59123433A - Battery charger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a Q-terry charging device, and in particular, to a power supply for 1) 5 in a device that supplies power from a battery to a load through a ξ-bridge circuit, such as a ζ-terry car. The chopper bridge circuit is then used to supply the battery charging device that charges the battery.

[Background of the invention]

In recent years, from the perspective of energy saving, the development of electric vehicles using Patch +) YG has been progressing. The current battery is 1
It is necessary to charge the battery after approximately 100km of use, and after using the streetcar, it is necessary to always leave the light on in the container.

In the past, charging was done using a separate battery power source that was left unused, or using a photoelectric device attached to an electric vehicle. Figure 1 shows an example of a conventional photoelectric system. show.

PWM (,ξ/l/s1iy,i
Modulation)', the IAJ valve rotates the DC motor 3 in four quadrants. If this transistor bridge method is used, regeneration from the DC motor 3 to the Passiteri power source 1 can be performed continuously from the drive mode, so the Pap rear 17
It is well known that driving an electric motor using a power source is useful from the viewpoint of energy saving.

A torque coefficient is outputted by the accelerator 4 and inputted to the current nog turn generator 5. The speed detector 6 connected to the DC motor 3 detects the speed of the motor, inputs the current/''l turn to the turn generator 5, changes the current nomiturn depending on the speed, and sets the current reference Id* of the DC motor 3. For example, if the current reference Id* is output with a chisel turn that makes it zero at a certain speed or higher, the speed will not increase above that speed and the speed will be under speed limit control.

The current reference Id is compared with the current Id detected by the current detector 7 of the DC motor 30', which is converted into a PWM signal by the comparator 8 having hysteresis, and the drive circuit 9 turns on and off the transistors of the transistor bridge 2. These circuits are well-known as DC power single-motor combination circuits.

When this DC motor drive circuit is applied to an electric vehicle,
・It is necessary to recharge the battery. In this case, when using a household commercial power supply 10, 110v or 220v
v is the standard, and the output current whose phase is controlled by the mixed bridge 11 of silis and diodes is passed through the smooth sliding accelerator 1.
2 to photoelectrically charge the battery 1.

A charging current reference circuit 13 which receives the voltage of the battery 1 as an input outputs a charging current reference.The charging current is detected by a current detector 14, and this current is compared with the current reference voltage, and an amplifier 15 This amplifies the error, and the phase circuit 16 controls the firing phase of the thyristor to control the charging current.

However, with these conventional methods, there is a limit between the commercial power supply voltage and the rechargeable battery voltage, for example, 220
There was a drawback that the commercial power source described in (2) could only charge batteries with a voltage of approximately 200 V DC or less. This is because the DC average voltage due to phase control is insufficient. Furthermore, an equal voltage transformer is required in order to charge a battery exceeding DC100■ with an AC power supply of 110V.

Further, in order to charge the battery, it is necessary to flow a current of several tens of amperes, and it is undesirable to draw a large current containing a large amount of harmonic current 7 whose phase is delayed from the commercial power supply because of the generation of power supply distortion.

Moreover, the battery charging circuitry shown in FIG. 1 has become quite large, and from the viewpoint of automobile space and energy conservation, it has been desired to reduce the weight and space.

[Structure of the invention]

The present invention was made in order to improve the drawbacks of the above-mentioned prior art, and it is possible to control the commercial power supply electrically (using a transistor bridge for residual operation) using cis-width modulation (PWM) to boost the voltage and photoelectrically charge the battery. It is characterized by:

This makes it possible to charge a 1M, EE battery, which is higher than a commercial power supply, resulting in space and energy savings.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings. Second
The figure is the circuit diagram, and the same parts as in Figure 1 are the same.
is numbered 2, and its explanation will be omitted.

During operation of the DC motor, the contactor 20 remains on, and the switch for the current reference Id* is closed to the lower side, forming the same circuit as in Figure 1.

When charging the battery, the contactor 20 is turned off, the switch is closed upward, and the charging alternating current reference IAc* is input to the comparator 8. The AC power source 10 is connected to one end of the load 1i111 of the transistor bridge 2 and the current detector 7 through the filter circuit 21 and the AC reactor 22.
Connect between the load sides of the

On the other hand, as a battery charging circuit,
The charging current reference ■1 outputted by the charging AC current reference circuit 13 as the E-input is the tH current and father current el' of the AC power supply 10.
t: Create AC charging 11 current reference IAc* using the current reference circuit.

For example, please use an AC current reference circuit.7. ) can be easily achieved.

Comparing the AC light and lightning current IAc detected by the current detector 7 with the commercial standard IAc* of the father current charging, the transistor bridge 2 is compared with the pulse width, 1. '、l to operate / Matsuteri Mitsushige.

An example of this current waveform is shown in FIG. Father 7ha1. light'l
The ij current IAc flows upward and downward within the broken line determined by the hysteresis width Δ of the comparator 8 above and below the AC charging current reference IAc*.

FIG. 4 shows the characteristics of the charging current reference circuit 13.
2 shows the relationship between the voltage V and the charging current standard 9. When the voltage is low, constant current charging is performed, and when the voltage rises when charging is complete, the charging current is reduced.

Since the alternating current charging current includes a high harmonic component as shown in FIG. 3, the filter 21 reduces the high harmonic component of the current flowing from the commercial power source 10.

Note that although the case of the DC motor 3 has been described above, the present invention can be applied in exactly the same manner to the case of driving an AC motor 3a as shown in FIG.

To explain this using Fig. 5, the transistor voltage
2a is a 3-phase bridge so that it can output 3-phase AC output, and the current IU of the U-phase and W-phase of the AC motor.

■T are detected by current detectors 7a and 7b, respectively, and V
The phase current is determined by the summing amplifier 5 from 1v=-(iU+).

The iIE style z-turn generator 5a generates motor current references IU*, IV*, Iw* heat output, motor currents IU, I from the accelerator 4 torque signal and the AC motor speed signal.
V, IW and comparators Ba, 8b, 8CIC respectively
, J: are compared, and the transistor is driven by the drive circuit 9 as an A pulse width modulation signal.

In this circuit as well, the nototeri charging circuit is exactly the same as that shown in FIG.

Needless to say, the AC power supply for charging is the same in a three-phase circuit, and in Fig. 5, the second phase of the load motor is also turned on by the contactor, and the AC photoelectric current standard is output in three phases.
Needless to say, this can be realized by comparing with three-phase currents. In addition, as shown in FIG. 5, the calculation and output of the charging current for the three-phase AC photoelectric current reference and the notary voltage can be configured in an extremely compact manner by applying a microcomputer.

〔Effect of the invention〕

As explained above, according to the present invention, the raw chopper circuit for battery charging uses an electric motor and a trunk bridge for driving, and uses ξ pulse width modulation to supply a commercial power supply with a current having a good power factor close to a sine wave. flows, so even if a large current flows, the commercial power supply will not be distorted, and other equipment will not be adversely affected. In addition, by switching the main circuit of the motor in one or two places, a transistor bridge can be used for charging, making it an extremely compact, economical, and lightweight device, making it ideal for electric vehicles, etc., and from the point of view of energy saving. It also has favorable effects.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional charging device, Fig. 2 is a circuit diagram of an embodiment of the present invention, Figs. 3 and 4 are operation explanatory diagrams, and Fig. 5 is a circuit diagram of another embodiment of the present invention. FIG. ■...Battery, 2 and 2a...Transistor bridge: 3 and 3a...Electric motor, 4...Accelerator, 5...
...N flow/' Turn generator, 6...Speed detector, 7
', , 7a, 7b...Current (starting number, 8,
8a, 8b, 8c...Comparator, 9...Drive circuit (1i1.1r.>:, if power supply, 13...Charging current reference circuit, 14...Current detector, 15...・Amplifier, 16... Phase circuit, Addition... Contactor, 21...
- Filter, 22...Reactor, %...AC charging current reference circuit, 24...Selector switch, 5...Addition circuit. Applicant's agent Kiyoshi Inomata Figure 1 Figure 2 Figure 3 Figure 4 K Figure S

Claims (1)

[Claims] 1. In a battery charging device in a device that supplies power from a battery power source to a load using a bridge circuit that combines a plurality of arms each consisting of an electric valve and diodes connected in parallel to the electric valve, A battery charging device characterized in that it has an AC power supply connected to the load end of the bridge circuit through a reactor 7 during sleep, and a device for controlling the pulse width of the bridge and controlling the charging current. 2. The battery charging device according to claim 1, further comprising a switch for disconnecting at least one load end of the bridge circuit from the load during battery charging. 3. Photoelectric current (1) The battery charging device according to claim 1, wherein the controlling device also serves as a control circuit of a device that supplies power to a load.