Circuit arrangement for cyclic supply

Details Circuit arrangement for cyclic supply Circuit arrangement for cyclic supply

1990-09-06

1994-05-17

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323222, 361152, 361154, G05B 1100, G05F 1613

Patent

active

053131533

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention relates to a circuit configuration for the synchronized supply of an electromagnetic user with regulation which is acted upon by a control signal representing the difference between the instantaneous signal at the user and a predeterminable reference signal. This type of a circuit configuration is known e.g. from the U.S. Pat. No. 4,452,210 and comprises a driver circuit for an injection valve of an internal-combustion engine. In the case of the known driver circuit, the field current is determined while the injection valve is open and a signal is derived from this. A control signal, which serves as the basis of a pulse-duration-modifying signal, is generated from the difference between this instantaneous signal and a predeterminable reference signal. The field current for the injection valve is therefore controlled by influencing the pulse duration of the field current signal and is thus modulated according to pulse duration.
However, this type of regulation with the aid of pulse duration modulation has the result that, due to the changing duration of the electric power pulses for the field current of the injection valve during the regulating process, harmonic waves occur.


ADVANTAGES OF THE INVENTION

The circuit configuration according to the invention for the synchronized supply of an electromagnetic user with regulation which is acted upon by a control signal representing the difference between the instantaneous signal at the user and a predeterminable reference signal, whereby a synchronized current regulator is provided whose clock frequency is able to be readjusted, has in regulator are available, namely a compensation for the counter electromotive force of the electromagnetic user and an idle time of zero for a step response. According to the invention, these advantages are combined with the advantageous property that a fixed, constant frequency for clocking is achieved in the stationary state.
In order to readjust the clock frequency, preferably a circuit element is provided which has a frequency/voltage transformer with an integrator which is located downstream. Noises in the clock frequency can be effectively squelched as a result of integration, since the integration signal does not change considerably when additional noise pulses are present at the clock frequency. A comparator is preferably provided to perfect the frequency/voltage transformer.
To couple the circuit element to the current regulator for the readjustment procedure, a circuit breaker, whose control signal is able to be supplied to the circuit element, is advantageously provided which is preferably assigned to and acts upon the user. Furthermore, a trigger circuit, whose hysteresis is able to be changed by the circuit element, is provided to control the circuit breaker.
For this purpose, the trigger circuit is advantageously designed as a Schmitt trigger. A Schmitt trigger has a hysteresis which is usually determined by the corresponding wiring configuration of the Schmitt trigger and can be changed by another wiring configuration if indicated. Therefore, according to the invention, the current hysteresis of the current regulator is adaptable to various circumstances by means of the wiring configuration of the Schmitt trigger.
In the case of a particularly advantageous development of the circuit according to the invention, an additional control input is provided to which a voltage is able to be applied to control the current hysteresis of the current regulator. Therefore, in this specific embodiment, an adjustable voltage is used instead of a voltage for the Schmitt trigger which has been set by means of fixed wiring configuration.


DRAWING

The invention is more closely explained in the following in light of an illustrated, preferred exemplified embodiment from which proceed further advantages and features.
FIG. 1 shows a greatly simplified, schematic block diagram to illustrate the principle of the readjustment procedure according to the invention;
FIG. 2 shows a preferred exemplified embodiment of a

REFERENCES:
patent: Re33285 (1990-07-01), Kunen
patent: 3796942 (1974-03-01), Bynum
patent: 3973545 (1976-08-01), Fischman et al.
patent: 4271812 (1981-06-01), Bodig et al.
patent: 4357572 (1982-11-01), Andersen et al.
patent: 4397290 (1983-08-01), Tanaka et al.
patent: 4446410 (1984-05-01), Yagura et al.
patent: 4503480 (1985-03-01), Pickard et al.
patent: 4523251 (1985-06-01), Erdmann et al.
patent: 4544986 (1985-10-01), Buchl
patent: 4978865 (1990-12-01), Hartmann et al.
patent: 5014675 (1991-05-01), Koiwa
patent: 5109827 (1992-05-01), Nobe et al.

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