An alternative voltage stabilizer capable of improving transient response and increasing area of stabilized voltage, includes:
- a low pass input filter circuit:
- which is composed of a first and second inductors and a plurality of input capacitors, another capacitor is jumper connected at the output of the circuit, so as to prevent low frequency interference;
- a wave dividing circuit:
- which divides input sinusoidal wave into positive and negative half cycles through two diodes parallelly connected with each other;
- a voltage reducing and width modulating circuit:
- which is composed of two on-off transistors, the collector of the first transistor being connected to the cathode of one of said diodes, while the emitter of the other of the second transistor being connected to the anode of the other of said diodes, and the gates of said transistors being connected with outside input signals;
- a voltage supplementing and width modulating circuit:
- a third inductor therein being connected to the collector of a third transistor, a fourth inductor is connected to the emitter of a fourth transistor, the emitter of said third transistor being connected to the collector of said fourth transistor, the gates of said another and said fourth transistor being respectively connected with outside input signals;
- a wave recombining circuit:
- which recombines said divided wave forms and recovers them to be alternative waves by contrary phased disposing of a third and fourth diodes, the output of the wave circuit being jumper connected with a high frequency filter capacitor;
- a low pass output filter:
- which is composed of third and fourth inductors and a plurality of output capacitors;
- an error comparing circuit:
- which compares an alternative sinusoidal standard wave directly with feedback signals of an alternative voltage stabilizer for the error after an alternative sinusoidal standard wave generator oscillates to give a low distortioned alternative sinusoidal standard wave and supply power frequency reaches synchronism and phase lock, once said feedback signals having slight errors, it produces a correcting signals for the errors, said error correcting signals being compared by a comparator with a high frequency triangular wave signal generated by a high frequency triangular wave generator, and then a high frequency pulse width modulating signal changing fast in pursuance of a high and low values of said supply power being obtained;
- said stabilizer is characterized in that:
- the voltage of a alternative supply power is divided into positive and negative half cycles by a wave dividing circuit, then the error of the input voltage which is too high or too low is compared by said error comparing circuit to decide the level of voltage of said gates of all said transistors, or to input suitable high frequency pulse width modulating signals or reverse pulse width modulating signals of high frequency to supplement the overly low input voltage using said inductors and capacitors, or to reduce the overly high voltage, and lastly said divided wave forms are recombined and recovered to a rated alternative waves to render said alternative voltage stabilizer to keep in a state of stable voltage output.