TWI502868B - Self-oscillating and single stage high power factor driver circuit - Google Patents

Description

Self-excited single-stage high power factor driving circuit

The invention is a driving circuit, in particular to a self-excited single-stage high power factor driving circuit

The driving circuit is an intermediate circuit between the main circuit and the control circuit for amplifying the signal of the control circuit, wherein the driving circuit also has the function of isolating the load or adjusting the voltage and current of the input load. In the existing circuit architecture, for example, a conventional self-excited circuit, as shown in FIG. 11A, the advantage of the conventional self-excited circuit architecture is that the oscillation can be formed by the resonant tank in the circuit architecture, and the switch is driven. Turning on or off, thereby eliminating the manufacturing cost increased by using the integrated circuit, but the power factor of the power input by the conventional self-excited circuit architecture is low, and it is necessary to rely on the correcting circuit to improve the power, or only Used in electronic devices where power factor is not limited by national safety regulations. For another example, a single-stage high power factor circuit, as shown in FIG. 11B, can achieve power factor correction by switching between a capacitor LPFC and a quasi-half bridge resonant circuit in a circuit structure of a single-stage high power factor circuit. The effect, and the switching switches in the circuit are also operated at zero voltage switching, but in the single-stage high power factor circuit, in order to provide the trigger signal, there must be an additional integrated circuit to drive the conduction of the switch. And shutting down, thus increasing the manufacturing cost of the circuit architecture. It can be seen from the above examples that the current driving circuits have their own shortcomings and advantages, and cannot have an integrated circuit architecture to solve the above mentioned problems at the same time.

At present, the driving circuits have their own shortcomings and advantages. For example, if the power factor is too low or an integrated circuit is needed to drive the switching on and off, there is no integrated circuit architecture to solve the problem of the user. The invention provides a self-excited single-stage high power factor driving circuit, comprising a rectifying circuit and a signal generating circuit, the signal generating circuit comprising a first signal trigger circuit, a second signal trigger circuit and a quasi-half bridge resonant circuit The first signal triggering circuit, the second signal triggering circuit, the quasi-half bridge resonant circuit, the energy storage circuit and the trigger signal transformer are all electrically connected, wherein: the trigger The signal transformers respectively have three sets of contact groups, each of which includes a trigger switch and the trigger signal transformer, and the first signal trigger circuit is electrically connected to the second contact group connected to the trigger signal transformer, and the The second signal trigger circuit is connected to the third contact group connected to the trigger signal transformer, wherein: the signal triggers the power The trigger signal transformers included in the trigger signal are connected in parallel with a set of shunt diodes, and the trigger switches are all connected in parallel with a bypass diode. The energy storage circuit comprises two storage capacitors and a bidirectional trigger diode, wherein the energy storage device One end of the capacitor (C ₂ ) is electrically connected to the bidirectional trigger diode, and the bidirectional trigger diode is turned on by the voltage of the storage capacitor (C ₂ ). An AC power source is electrically connected to an input inductor and an input capacitor. The AC power output by the AC power source is input to the rectifier circuit via the input inductor and the input capacitor, and the DC pulse outputted by the rectifier circuit is input through a power factor correction inductor. Signal generation circuit.

Thereby, the present invention has the following advantages:

1. The power factor correction inductor (L _PFC ) 12 and the switching switch of the quasi-half bridge resonant circuit can achieve the power factor correction effect, and can also reduce the voltage to the voltage required by the load.

2. The self-driving switch can be driven by the circuit itself, and the trigger switches (S ₁ , S ₂ ) in the circuit are operated at zero voltage switching, which can improve the efficiency of use.

50‧‧‧AC power supply

11‧‧‧Rectifier circuit

12‧‧‧Power Correction Circuit (L _PFC )

20‧‧‧Signal generation circuit

21‧‧‧First signal trigger circuit

211‧‧‧ trigger switch

22‧‧‧second signal trigger circuit

23‧‧‧ quasi-half bridge resonant circuit

24‧‧‧ Energy storage circuit

25‧‧‧Trigger signal transformer

(L _IN )‧‧‧Input inductance

(C _IN )‧‧‧ Input Capacitor

(C ₁ , C ₂ ) ‧ ‧ storage capacitors

(T _signal1 , T _signal2 T _signal3 ) _{‧‧‧Trigger} group of trigger signal transformer

(SIDAC)‧‧‧ Bidirectional Trigger Diode

(D _B )‧‧‧ Bypass diode

The first figure is an actual circuit diagram of a preferred embodiment of the present invention.

The second figure is a circuit action diagram I of the preferred embodiment of the present invention.

The third figure is a circuit action diagram II of a preferred embodiment of the present invention.

The fourth figure is a circuit diagram III of the circuit of the preferred embodiment of the present invention.

Figure 5 is a diagram showing the operation of the circuit of the preferred embodiment of the present invention.

FIG. 6A is a schematic diagram of high frequency switching of input voltage and inductor current according to a preferred embodiment of the present invention.

FIG. 6B is a waveform diagram of voltage and current in which the input voltage and the input current are not filtered by the preferred embodiment of the present invention.

The seventh figure is a waveform diagram of the input current flowing through the filtered voltage and current according to a preferred embodiment of the present invention.

Figure 8 is a diagram showing the input voltage of the inductor current I _LPFC , the storage capacitor voltage and the quasi-half bridge resonant circuit in accordance with a preferred embodiment of the present invention.

Ninth aspect is a schematic diagram of a resonant current after a weak resonant voltage according to a preferred embodiment of the present invention Figure.

FIG. 10 is a schematic diagram of zero voltage switching of the trigger switches S1 and S2 according to a preferred embodiment of the present invention.

Figure 11A is a prior art diagram of a preferred embodiment of the present invention.

Figure 11B is a prior art diagram of a preferred embodiment of the present invention.

The invention provides a self-excited single-stage high power factor driving circuit, comprising a rectifying circuit 11 and a signal generating circuit 20.

Referring to the first figure, an AC power source 50 is electrically connected to an input inductor (L _IN ) and an input capacitor (C _IN ). The AC power output by the AC power source 50 is via the input inductor (L _IN ) and the input capacitor (C). _IN ) is input to the rectifier circuit 11, and the rectifier circuit 11 can be a full-wave rectifier circuit or a half-wave rectifier circuit. The DC pulse output from the rectifier circuit 11 is modified by a power factor (L _PFC ). 12 is input to the signal generating circuit 20.

The signal generating circuit 20 includes a first signal trigger circuit 21, a second signal trigger circuit 22, a quasi-half bridge resonant circuit 23, a tank circuit 24 and a trigger signal transformer 25, and the first signal trigger circuit 21 The second signal triggering circuit 22, the quasi-half bridge resonant circuit 23, the energy storage circuit 24, and the trigger signal transformer 25 are electrically connected to each other, wherein the trigger signal transformer 25 has three sets of contact groups (T _signal1 , T, respectively). _Signal2 , T _signal3 ).

Each trigger circuit includes a trigger switch (S _{1 /} S ₂ ) 211 and a corresponding contact group (T _signal2 / T _signal3 ) of the trigger signal transformer 25, the first signal trigger circuit 21 and the trigger signal transformer 25 The second contact group (T _signal2 ) is electrically connected, and the second signal trigger circuit 22 is electrically connected to the third contact group (T _{signal 3} ) of the trigger signal transformer 25 , and the trigger switch (S _{1 )} And S ₂ ) 211 are formed in series.

One end of the power correction correction inductor (L _PFC ) 12 is connected to the rectifier circuit 11 , and the other end of the power correction factor (L _PFC ) 12 is connected to the series connection of the two trigger switches (S ₁ and S ₂ ) 211 Point connection.

The set of contacts (T _signal2 /T _signal3 ) of the trigger signal transformer 25 included in the first signal trigger circuit 21 and the second signal trigger circuit 22 are respectively connected in parallel with a set of reverse series. a diode, and the trigger switch (S _{1 /} S ₂ ) 211 is respectively connected in parallel with a bypass diode; in the present invention, the trigger switch (S _{1 /} S ₂ ) 211 can be a metal oxide semiconductor (MOSFET) or a double Polar transistor (BJT) is not limited here. The quasi-half bridge resonant circuit 23 includes a resistor, an inductor and a capacitor. The resistor, the inductor and the capacitor are connected in series to each other to generate resonance, and the quasi-half bridge resonant circuit 23 and the first of the trigger signal transformer 25 The contact group (T _signal1 ) is connected in series. One end of the quasi-half bridge resonant circuit 23 is connected to two series connection points of the trigger switches (S ₁ and S ₂ ) 211, and the other end of the quasi-half bridge resonant circuit 23 is connected to the first contact group (T _signal1 ) And the other end of the first contact group (T _signal1 ) is connected to the storage capacitor (C ₁ ).

The energy storage circuit 24 includes two storage capacitors (C ₁ , C ₂ ) and a bidirectional trigger diode (SIDAC), wherein one end of the storage capacitor (C ₂ ) is electrically connected to the bidirectional trigger diode (SIDAC). the other terminal of the diac (SIDAC) of one end of the third contact set trigger signal transformer _(T signal3) of 25 is connected to the other end of the third contact set trigger signal transformer _(T signal3) of 25 of the The other end of the storage capacitor (C ₂ ) is connected, so that the storage capacitor (C ₂ ), the bidirectional trigger diode (SIDAC) and the third contact group of the trigger signal transformer 25 (T _signal3 ) form a circuit back. ring. The junction of the storage capacitor (C ₂ ) and the bidirectional trigger diode (SIDAC) is connected to a resistor and an anode of a diode, and the other end of the resistor is connected to the storage capacitor (C ₁ ) to store the capacitor can capacitance (C ₁₎ the other end (C ₂₎ is connected to the other end of the storage capacitor, the cathode of the diode connected in series with the trigger point of the two switches of the connection.

Please refer to the sixth and seventh figures. The power factor correction effect can be achieved by correcting the inductance (L _PFC ) 12 and the switching switch of the quasi-half bridge resonant circuit 23, as shown in FIG. 6A and B, the line segment 1 And the third and fourth segments are respectively the input inductor current (I _LPFC ) flowing through the input inductor (L _IN ) and the input voltage of the AC power source 50, if the input inductor current (I _LPFC ) is in a discontinuous conduction ( In the case of DCM), when the voltage across the input inductor (L _IN ) is increased, the input inductor current (I _LPFC ) is also increased accordingly, so that the input inductor current exhibits a 60 Hz waveform packet and then passes the high frequency filter. Complete the work of correcting the cause.

Referring to the second and third figures, the AC power outputted by the AC power source 50 is rectified by the rectifier circuit 11 and a DC pulse is outputted to the signal generating circuit 21, and the DC pulse is connected in parallel to the trigger switch (S ₁ ). After the bypass diode of 211, the two storage capacitors (C ₁ , C ₂ ) of the storage circuit 24 are charged and stored.

The two storage capacitors (C ₁ , C ₂ ) gradually increase in voltage across the two ends under continuous charging and energy storage, when the voltage across the storage capacitor (C ₂ ) is higher than the bidirectional trigger diode (SIDAC) ) the bidirectional trigger when the breakdown voltage of diodes (SIDAC) thus turned on after turning on the storage capacitor (C ₂₎ forming the start of discharge circuit of the two-way trigger diode (SIDAC) through, so that the trigger signal transformer _(T signal3) 25 is turned on and The trigger switch (S ₂ ) 211 is triggered to be turned on.

Please refer to the fourth and fifth figures. The power-repairing inductance (L _PFC ) 12 forms a charging circuit via the triggering switch (S ₂ ) 211. The function of the modified inductor current I _LPFC flows through the power-correcting inductance (L). _PFC ) 12 and the trigger switch (S ₂ ) 211, and the storage capacitor current (Ir) flowing through the storage capacitor (C ₁ ) forms a loop via the trigger switch (S ₂ ) 211 to the quasi-half bridge circuit 23 Charge it.

The quasi-half bridge resonant circuit 23 performs charging while _turning on the trigger signal transformer (T _signal1 ) 25 to turn on the trigger switch (S ₁ ) 211. Referring to the ninth and tenth views, the quasi-half bridge resonance is in the present invention. Circuit 23 can be designed to have an overall impedance that is inductive, while its inductive impedance allows the trigger switch (S ₁ , S ₂ ) 211 to operate in a zero voltage switching operating environment.

Thereby, the present invention has the following advantages:

1. The power-correcting effect can be corrected by the power-correcting inductance (L _PFC ) 12 and the switching switch of the quasi-half bridge resonant circuit 23, and the voltage can be reduced to the voltage required by the load.

2. The self-driving switch can be driven by the circuit itself, and the trigger switches (S ₁ , S ₂ ) in the circuit are operated at zero voltage switching, which can improve the efficiency of use.

50‧‧‧AC power supply

11‧‧‧Rectifier circuit

12‧‧‧Power Correction Circuit (L _PFC )

20‧‧‧Signal generation circuit

21‧‧‧First signal trigger circuit

211‧‧‧ trigger switch

22‧‧‧second signal trigger circuit

23‧‧‧ quasi-half bridge resonant circuit

24‧‧‧ Energy storage circuit

25‧‧‧Trigger signal transformer

(L _IN )‧‧‧Input inductance

(C _IN )‧‧‧ Input Capacitor

Claims (2)

A self-excited single-stage high power factor driving circuit includes a rectifying circuit, a power factor correcting inductor and a signal generating circuit, wherein a DC pulse outputted by the rectifying circuit is input to the signal generating circuit via the power correcting inductor, One end of the power correction correction inductor is connected to the rectifier circuit, wherein: the signal generation circuit comprises a first signal trigger circuit, a second signal trigger circuit, a quasi-half bridge resonance circuit, a storage circuit and a trigger signal transformer. The trigger signal transformer includes a first contact group, a second contact group, and a third contact group; the first signal trigger circuit and the second signal trigger circuit each include a trigger switch, and the first signal trigger circuit The second signal contact circuit is electrically connected to the second contact group of the trigger signal transformer, and the second signal trigger circuit is electrically connected to the third contact group of the trigger signal transformer, and the trigger switch is formed in series; The other end is connected to the series connection point of the trigger switch; the first signal trigger circuit and the second signal trigger circuit comprise the trigger signal change Is a set of all parallel zener diode, are connected in parallel to the trigger switch bypass diodes; the tank circuit comprises a storage capacitor and a two-way trigger diode, wherein the storage capacitor (C ₂₎ and the end The bidirectional trigger diode is electrically connected, and the other end of the bidirectional trigger diode is connected to one end of the third contact group of the trigger signal transformer, and the other end of the third contact group of the trigger signal transformer and the storage capacitor (C) ₂ ) The other end is connected, the connection point of the storage capacitor (C ₂ ) and the bidirectional trigger diode is connected to a resistor and an anode of a diode, and the other end of the resistor and the storage capacitor (C ₁ ) the other end of which is connected to the storage capacitor (C ₁₎ of the (C ₂₎ is connected to the other end of the storage capacitor, the cathode of the diode with the two trigger switches of the series connection point is connected; and the quasi-resonant half-bridge One end of the circuit is connected to a series connection point of the trigger switches (S ₁ and S ₂ ), and the other end of the quasi-half bridge resonant circuit is connected to the first contact group, and the other end of the first contact group is the storage capacitor (C ₁₎ is connected, and the half-bridge quasi-resonant electrical circuits The impedance trigger switch operated in zero voltage switching of the working environment. The self-excited single-stage high power factor driving circuit according to the first aspect of the invention, wherein the quasi-half bridge resonant circuit comprises a resistor, an inductor and a capacitor, wherein the resistor, the inductor and the capacitor are connected in series with each other.