JP3060455B2 - Voltage supply device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a voltage supply device that compensates for a decrease in supply voltage from a battery, and more particularly to a voltage supply device that compensates for a temporary voltage decrease at the time of starting a high-output motor or the like. .

(Prior Art) In recent years, a vehicle is equipped with a turbocharger that performs a supercharging operation by mounting a compressor that compresses air on a turbine driven by exhaust energy of the engine to send air to the engine and perform a supercharging operation. The increase in output is measured.

In addition, there has been proposed a turbocharger for an internal combustion engine in which a rotating electric machine serving as an electric-generator is mounted on a turbine shaft of this kind of turbocharger and the rotating electric machine is controlled in accordance with a signal from a means for detecting an engine load and the number of revolutions. JP-A-62-
No. 48931.

When the engine is running at a low load, the electric power is supplied from the battery to the rotating electrical machine attached to the turbocharger, and the rotating electric machine is operated as an electric motor.The turbocharger assists the supercharging operation, thereby improving the torque at low engine speeds. I'm measuring.

(Problems to be Solved by the Invention) At the initial stage of driving the rotating electric machine mounted on the turbocharger as described above as an electric motor, a large amount of electric power flows from the battery through the driving device of the rotating electric machine. Therefore, there is a problem that functions of the on-vehicle devices such as a headlight are deteriorated.

As a device powered by a battery, the starter of the engine consumes a large amount of current.However, in this case, since the vehicle is stopped when the engine is started, there is little problem even if the voltage to other in-vehicle devices drops. become.

Therefore, the present invention has been made in view of the above-described problems, and has as its object to reduce the voltage to other devices when the supply voltage from the battery temporarily drops, such as when starting a rotating electric machine. It is an object of the present invention to provide a voltage supply device for reducing the influence of the voltage supply.

(Means for Solving the Problems) According to the present invention, in a power supply device in which a plurality of devices including a rotating electric machine that supports a supercharging activity of a turbocharger share a single battery as needed, a power supply reduction is prevented. An inverter means provided between the device requiring the power supply and the battery serving as a power supply; a control circuit provided between the inverter means and the equipment requiring the power-supply reduction prevention; Control means for detecting the voltage of the battery, reducing the reactance of the control circuit in response to the voltage drop generated by the assistance of the supercharging activity, and keeping the supply voltage to the device requiring the power supply voltage drop prevention constant. Are proposed.

(Operation) In the above-defined voltage supply device of the present invention, the power supply circuit for the vehicle-mounted electric device includes a switching circuit serving as power conversion means for converting DC to AC, and an iron core type reactor having a secondary winding. It is provided in series, and has the effect of reducing the reactance value of the reactor in response to the decrease in the supply voltage, facilitating the passage of AC power, and compensating for the decrease in the supply voltage.

(Example) Next, an example of the voltage supply device of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of an example of a rotating electric machine attached to a turbocharger.

In FIG. 2, reference numeral 10 denotes an engine, which is operated by the combustion energy of air supplied through an intake pipe 1a and supplied fuel, and exhaust gas after combustion is discharged through an exhaust pipe 1b.

Reference numeral 1 denotes a turbocharger, which is connected to an exhaust pipe 1b and an intake pipe 1a, and is driven by exhaust gas energy.
1C, a compressor 1d attached to the rotating shaft of the turbine 1C and compresses air, and sends compressed air generated by rotation of the compressor 1d to the engine 10 through the intake pipe 1a,
The output of the engine 10 is increased, and the turbine 1c
A rotary electric machine 2 serving as a motor-generator is mounted between the compressor and the compressor 1d.

When the engine 10 is at a low rotation speed and a heavy load, the electric power is supplied from a battery (not shown) to the rotating electric machine to rotate the rotating electric machine, thereby energizing the compressor 1d to assist the supercharging operation of the turbocharger 1. .

In FIG. 1, a rotary electric machine 2 provided in a turbocharger 1 is supplied with power via a booster 4a and an inverter 4b using a battery 3 as a power source.
4a is a DC input that uses a switching element to make a pulsating electric power, which is boosted by a transformer and then rectified into a high-voltage DC electric power, and the inverter 4b is turned on / off using a semiconductor control element. Thus, the DC power is converted into AC power of a predetermined frequency, and the booster 4a and the inverter 4b
Are configured to be controlled by a command from a controller 5 described later.

Reference numeral 6 denotes an on-vehicle electric load, for example, an electric device required for running the vehicle, such as a headlight, whose function becomes insufficient when the supply voltage is reduced, so that a predetermined voltage needs to be supplied.

Therefore, in this embodiment, the switching circuit 7, the control circuit 8, and the rectifying circuit 9 are provided to supply electric power to the electric load 6 without directly applying the DC power from the battery 3 to the electric load 6. Is what you do.

The switching circuit 7 includes a semiconductor control element 7a, a pulse generator 7b, and a transformer 7c. The power supplied from the battery 3 to the switching circuit 7 is controlled by a circuit according to a pulse signal from the pulse generator 7b. This is a so-called inverter means, which forms a pulsating flow by the semiconductor control element 7a which opens and closes, and is boosted by the transformer 7c.

Further, the control circuit 8 includes a reactor 8a and a secondary power supply 8b, and supplies power from the secondary power supply 8b to a secondary winding of the reactor 8a to control the magnetic saturation of the core of the reactor 8a. The rectifier circuit 9 includes a rectifier 9a and a smoothing capacitor 9b. The rectifier circuit 9 includes a rectifier 9a and a smoothing capacitor 9b. The rectifier circuit 9a rectifies and smoothes the AC power passing through the control circuit 8. Is converted into DC power.

The pulse generator 8a of the switching circuit 7 described above
And the secondary power supply 8b of the control circuit 8 is connected to the controller 5
, And controls the frequency of the pulse signal and the power supplied to the secondary winding of the reactor 8a.

The controller 5 is composed of a microcomputer and includes a processor, various memories, input / output circuits, and the like. When a reduced terminal voltage value of the electric load 6 is input, the controller 5 issues a command to the pulse generator 7a and the secondary power supply 8b. The control is performed so as to obtain an appropriate predetermined voltage value. In addition, when the rotating electric machine 2 is started, a control command is issued from the controller 5 to the booster 4a and the inverter 4b.

The operation of the present embodiment having such a configuration will be described. When the rotating electric machine 2 is not operating the electric motor, the power supplied to the electric load 6 is boosted by the transformer 7c of the switching circuit 7, but the secondary power of the reactor 8a The DC output from the rectifier circuit 9 is maintained at an appropriate voltage of the electric load 6 by controlling the current from the power supply 8b to the iron core with a small amount and controlling the current with a large reactance.

Next, a command is issued from the controller 5 to the booster 4a and the inverter 4b to supply driving power from the battery 3 to assist in supercharging the intake air to the engine. Is large, the terminal voltage of the battery 3 decreases due to the internal resistance of the battery 3 and the like.

Therefore, the voltage that reaches the electric load 6 via the switching circuit 7, the control circuit 8, and the rectifier circuit 9 changes and decreases. The controller 5 detects this voltage change and A command is issued to the secondary power supply 8b to instruct the secondary winding of the reactor 8a to increase and saturate the magnetic flux of the iron core by passing a current through the secondary winding. This allows reactor 8a
Of the transformer 7c, the AC power on the secondary side of the transformer 7c reaches the rectifier circuit 9 without being controlled by the reactor 8a, and becomes a predetermined supply voltage to be applied to the electric load 6. . Therefore, as described above, the controller 5 reduces the reactance value of the reactor 8a according to the reduced voltage, so that the supply voltage to the electric load 6 is compensated, and the function of the electric load 6 is maintained without deterioration. Is what is done.

As described above, the present invention has been described with reference to one embodiment.
Various modifications are possible within the scope of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) The present invention includes a switching circuit and a control circuit using a reactor in a power supply circuit of an in-vehicle electric device. When the supply voltage to the electric device decreases, the reactor responds to the decrease in the supply voltage. Is changed, and the voltage drop due to the reactor is reduced to compensate for the drop in the supply voltage, so that the effect of the voltage drop on the electric equipment is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
The figure is an explanatory view of an example of a rotating electric machine attached to a turbocharger. DESCRIPTION OF SYMBOLS 1 ... turbocharger, 2 ... rotating electric machine, 3 ... battery, 5 ... controller, 6 ... electric load, 7 ... switching circuit, 8 ... control circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-106875 (JP, A) JP-A-56-115179 (JP, A) JP-A-52-35038 (JP, A) 30689 (JP, U) Fully open 1979-85308 (JP, U) Fully open, 58-57241 (JP, U) Fully open, 61-89915 (JP, U) Fully open, 62-21783 (JP, U) 58-15893 (JP, U) 43-29692 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 16/02 F02B 37/10

Claims (3)

(57) [Claims] 1. A power supply apparatus in which a plurality of devices including a rotating electric machine for assisting a supercharging activity of a turbocharger share a single battery as required. An inverter means provided between the inverter means and the device which requires prevention of power supply drop, a control circuit capable of changing the reactance by an external signal, and detecting a voltage of the battery, Control means for reducing the reactance of the control circuit in response to the voltage drop generated by the assistance of (1) to maintain a constant supply voltage to a device requiring a power supply voltage drop prevention. 2. The voltage supply device according to claim 1, wherein said inverter means includes a switching circuit for converting DC to AC, and means for boosting the converted AC. 3. The voltage supply device according to claim 1, wherein the control circuit controls a magnetic saturation amount of the iron core to make the reactance variable.