Circuit arrangement including a self-oscillator circuit

Details Circuit arrangement including a self-oscillator circuit Circuit arrangement including a self-oscillator circuit

2000-01-31

2001-10-16

Lam, Tuan T. (Department: 2816)

Oscillators

Relaxation oscillators

C331S146000, C315S2090SC, C315S224000

Reexamination Certificate

active

06304154

ABSTRACT:

The invention relates to a circuit arrangement including a self-oscillating oscillator circuit and a series arrangement of a resistor and a capacitor, which series arrangement determines the oscillation frequency of said oscillator circuit.
Such a circuit arrangement is known from International Rectifier Data Sheet No. PD60029A, 1994. The oscillator circuit in said arrangement is an integrated circuit which, in addition, includes further elements, particularly a half-bridge comprising two MOSFET transistors, in order to form a driver arrangement. The oscillator circuit has a first input connected to one terminal of the resistor of the series arrangement, a second input connected to the other terminal of the resistor and to the node of the series arrangement between the resistor and the capacitor, and a third input connected to the other terminal of the capacitor and a ground potential. An oscillating supply voltage is available on the output of the oscillator circuit.
This oscillating supply voltage is to be applied to an electronic device which has a resonant frequency and which can be a resonant electronic device or a resonant arrangement including a plurality of electronic devices. A problem which then arises is to adapt the oscillation frequency of the oscillator circuit as accurately as possible to the resonant frequency of the electronic device to be powered and to compensate for values of the devices used, which values lie within tolerance ranges. Moreover, it is then required to use a minimal number of circuit elements for this purpose.
These problems are solved in that a control signal output of the electronic device has a resistive coupling to the series arrangement, which control signal output serves to supply a control signal which is representative of the oscillation mode of the electronic device.
Owing to the feedback of the control signal via a resistive coupling the voltage values across the resistor and capacitor series arrangement which determines the oscillation frequency of the oscillator circuit are influenced directly, which is adequate in most cases in order to obtain a sufficiently accurate oscillation frequency. The previously used intricate compensation circuits for the compensation of device tolerances, particularly tolerances of the resistor-capacitor series arrangement and the electronic resonant structure, are then not needed any longer.
In a preferred embodiment the resistor of the series arrangement is coupled to a first and a second control input of the oscillator circuit and the capacitor of the series arrangement is coupled to the second control input and a ground input of the oscillator circuit, and the control signal output of the electronic device is connected to the node between the resistor and the capacitor of the series arrangement. This embodiment is particularly suitable when the afore-mentioned oscillator circuit in accordance with the International Rectifier Data Sheet No. PD60029A, 1994 is used. The electronic device is, for example, a piezoelectric transducer (?). Preferably, the circuit arrangement in accordance with the invention is used for the generation of an output voltage of a ballast circuit in a low-pressure discharge lamp.
An embodiment of the invention will now be described in more detail, by way of example, with reference to the FIGURE.
The FIGURE shows a circuit arrangement including a self-oscillating oscillator circuit
1
of the type IR 2155 (see, International Rectifier Data Sheet No. PD60029A, 1994), which receives a potential of a supply voltage U
0
at an input V
CC
and, via a diode D, at an input V
B
. The input V
B
is connected to an output V
S
via a capacitor C
2
, to which an oscillating supply voltage U
B
is delivered. The output V
S
is further connected to the node between two MOSFET transistors T
1
and T
2
arranged in series as a half-bridge. The series arrangement of the transistors T
1
and T
2
is situated between the potential of the supply voltage U
0
and a ground potential. The transistors T
1
and T
2
is are driven by the oscillator circuit
1
via resistors R
4
and R
3
. The oscillation frequency of the oscillator circuit
1
is adapted to specific requirements by means of a series arrangement of a resistor R
1
and a capacitor C
1
. One terminal of the resistor R
1
is connected to a first control input R
T
of the oscillator circuit
1
. The other terminal of the resistor R
1
and one terminal of the capacitor C
1
are connected to a second control input C
T
of the oscillator circuit
1
. The other terminal of the capacitor C
1
is at ground potential and is connected to a ground input of the oscillator circuit
1
.


REFERENCES:
patent: 5517086 (1996-05-01), El-Hamamsy et al.
patent: 5559394 (1996-09-01), Wood
patent: 5657926 (1997-08-01), Kohji
patent: 5719471 (1998-02-01), Kachmarik
patent: 5925985 (1999-07-01), Zeng et al.

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