CN87208958U - Switching type alternating voltage segulating / modutating apparatus - Google Patents

Abstract

The utility model relates to a switching type alternating voltage regulating / modulating apparatus, comprising a high frequency conversion circuit to provide a superposing compensating voltage to the input voltage, a phase split control circuit to split the phase of and rectify the output of the high frequency conversion circuit, a high frequency filter circuit used for the high frequency wave filtering and a control circuit to detect, compare, amplify and drive in impulse the output voltage. The utility model has large power, high efficiency and small waveform distortion because of using the superposing compensating voltage, and the utility model is a general type alternating voltage regulating / modulating power supply with wide application.

Description

Switching type alternating voltage segulating / modutating apparatus

The present invention relates to a kind of switching regulator industrial frequency AC voltage-regulating and voltage-stabilizing device.

Existing AC stabilizer comprises electronic AC voltage stabilizer, saturation core regulator and controllable silicon automatic pressure-regulating type pressurizer.Wherein electronic AC voltage stabilizer is owing to adopt magnetic to amplify voltage regulating mode, thereby needs to consume metal materials such as a large amount of silicon steel sheets and copper and make its heaviness, and cost is higher.The magnetic saturation type pressurizer, the wave mode distortion is big, the precision of voltage regulation is low.The automatic adjustable type pressurizer of controllable silicon makes that the output voltage wave mode is imperfect, distortion is big, reliability is low owing to adopt the mode that changes the angle of flow to carry out pressure regulation, can not use as multiple power source.

The purpose of this invention is to provide a kind of employing transistor switch technology provides the superposition compensation to the difference of input voltage and load required voltage, thereby keeps the constant versatility voltage-regulating and voltage-stabilizing device of output voltage stabilization.

Device of the present invention constitutes the high frequency conversion loop (1) that comprises the voltage that is used to afford redress and is used for the superposition connecting circuit (3) that amplitude-modulated pulse voltage to the output of high frequency conversion loop carries out the phase-splitting control loop (2) of rectification and phase-splitting control and is used to make the power output raising.Be used for high frequency waves loop (4), be used for the operating state in high frequency conversion loop is implemented control loop (5) formation of control high fdrequency component filtering.Control loop (5) comprise to output voltage detect and with the reference voltage error-detecting amplifying circuit that amplifies of back relatively, frequency of oscillation is at 1KHz ₄The oscillator of～100KHz, an output driving pulse duty ratio is constituted by the pulse modulation and the drive circuit of error amplifying return circuit output control.

Further describe operation principle of the present invention and formation below in conjunction with accompanying drawing 1 of the present invention.

Bridge rectifier diode D in Fig. 1 circuit ₁～D ₄Switching transistor BG ₁, BG ₂High frequency transformer T ₁Form push-pull type high frequency conversion loop.Rectifier diode D ₅～D

Controllable silicon CT ₁, CT ₂Phased transformer T Form the phase-splitting control loop, high frequency transformer T ₁Secondary winding centre cap d end and phased transformer T

The superposition circuit that connects of the step-down tap C end of elementary winding; Inductance L ₁Capacitor C ₁Form the High frequency filter loop.Switching Power Supply pulse control integrated circuit * 1524 and output thereof detect transformer T

And bridge rectifier D

～D

The low frequency filtering resistance R ₃Capacitor C ₂Form control loop.Wherein integrated circuit * 1524 comprise reference voltage, oscillator, and error amplifier etc., 11,14 ends are the driving pulse output, these two ends meet BG respectively ₁, BG ₂Base stage control BG ₁, BG ₂Conduction ratio.* 1524 output pulse frequencies are by peripheral hardware resistance, capacitance settings 20 kilocycles.

The operation principle of Fig. 1 circuit is

Transistor BG in the high frequency conversion loop ₁, BG ₂Alternate conduction under the pulsed drive that integrated package in control loop * 152411,14 outputs provide is at BG ₁, or BG ₂Conduction period, D ₁～D ₄The pulsating dc voltage of rectifier output promptly is added on T ₁On the elementary winding of high frequency transformer, and be coupled to secondary output.T ₁The amplitude of secondary voltage pulse output is corresponding proportional with the input voltage of synchronization, and its ratio is exactly T ₁The primary and secondary turn ratio.So T ₁The envelope of output voltage is the two-way Amplitude Modulation High Frequency voltage with the input voltage same curve.T ₁The pulse duration of secondary output voltage rises certainly in BG ₁, BG ₂The conducting interval, by control DB ₁BG ₂The conducting phase promptly can control T with the ratio in cycle ₁The effective value of secondary output voltage.

The amplitude modulated voltage of high frequency conversion loop output is delivered to the phase-splitting control loop and is carried out rectification phase-splitting control, diode D in loop (2) ₅, D ₇The full-wave rectifying circuit of forming positive output, D ₆, D ₈The full-wave rectifying circuit of forming negative output, the amplitude modulated voltage of loop (1) output is through D ₅, D ₇Or D ₆, D ₈After the rectification, plus or minus half cycle alternating voltage is added on CT respectively ₁Or CT ₂CT ₁, CT ₂Trigger voltage by phase control transformer T

Provide, according to T

The end of the same name that each winding is demarcated as can be known, (establish ac input end (a) polarity for (b) polarity just for bearing) N when the positive half cycle of input AC ₂Winding makes CT ₁Control utmost point target is a positive voltage, CT ₁Be subjected to triggering and conducting, and N ₂Winding makes CT ₂The control utmost point is subjected to not triggering and conducting of negative voltage.CT ₁Conducting makes D ₅, D ₇The positive half cycle amplitude modulated voltage of rectification is through CT ₁, L, C ₁, T ₂Transformer N ₁Winding.T ₁The transformer centre cap is to C ₁Charging is carried out High frequency filter and is provided electric current, C to load ₁Electric capacity both end voltage polarity is that a right positive left side is negative.When the input AC negative half period, CT ₁Be not triggered, not conducting.CT ₂Be subjected to triggering and conducting, D ₆, D ₈The negative half period amplitude modulated voltage of output is through CT ₂, L ₁, C ₁, T ₃, T ₁The transformer centre cap is to C ₁Charging.C ₁The both end voltage pole reversal, contrast input voltage and C ₁Both end voltage polarity as can be known, C ₁Both end voltage is exported to load with superposition (addition) back that is in series with input voltage.The C that the testing result adjustment * 1,524 11,14 end output pulse width control change devices provide by control integrated circuit * 1524 pair output voltage ₁Terminal voltage value size can realize that load carries required stable alternating voltage.

The present invention is owing to adopt transistor switch technical work mode, thus have precision of voltage regulation height, voltage stabilized range is wide, response speed is fast, efficient is high, volume is little, lightweight characteristics.Because adopted voltage output rate addition method to make the element of available smaller power reach the big power of output, make cost reduce greatly again, efficient etc. further improve, and wave distortion is also very little, can be used for various electronic instruments and household electrical appliance.

Accompanying drawing 1 is a circuit diagram of the present invention

(1) high frequency conversion loop

(2) phase-splitting control loop

(3) superposition circuit

(4) High frequency filter loop

(5) control loop

Claims (3)

1, the present invention relates to a kind of switching regulator AC voltage-regulating device, by reference voltage circuit, oscillating circuit, error amplifying circuit, control loop (5) that pulse modulation and drive circuit are formed and major loop constitute, the invention is characterized in that major loop comprises that having one is connected with the input power supply, by diode D ₁～D ₄Constitute bridge rectifier, transistor BG ₁, BG ₂High frequency transformer T ₁The high frequency conversion loop of forming (1) that can adjust output voltage values; One and loop (1) medium-high frequency transformer T ₁Secondary winding connects and comprises two controllable silicon CT ₁, CT ₂With a phase control transformer T ₂With phase-splitting rectifier D ₅～D ₈The phase-splitting control loop of forming (2) that is used for the amplitude modulation pulse voltage is carried out rectification and phase-splitting; One with high frequency transformer T ₁Secondary winding centre cap d end and phase control transformer T ₂The superposition circuit (3) that the voltage and the input voltage of loop (1) output can be carried out superposition that elementary step-down tap c end connects; With one by inductance L and and capacitor C ₁Form, and form with the High frequency filter loop (4) that loop (2) are connected with loop (5) respectively.

2,, it is characterized in that the bridge rectifier diode in high frequency conversion loop, D according to the described device of claim (1) ₁～D ₄Two inputs be connected transistor BG with the input power supply ₁And BG ₂With high frequency transformer T ₁Elementary windings in series connects the back and is connected with the bridge rectifier output.

3, device according to claim 1 is characterized in that the phase-splitting rectifier D of phase-splitting control loop (2) ₅～D ₈Input and high frequency transformer T ₁Secondary winding connect, output respectively with controllable silicon CT ₁, CT ₂Negative electrode and anode connect.Controllable silicon GT ₁, CT ₂After remaining negative electrode and anode are connected to each other, be connected two controllable silicon CT with the high frequency wave-wave inductance L of High frequency filter loop (4) ₁～CT ₂Control end respectively with phase control transformer T ₂The end of oppisite phase of two secondary winding connect.