TWI437924B - Full-bridge electronic ballast having complementary continuous-current-mode charge pump pfc circuits - Google Patents

Description

Complementary continuous current mode charging pump power due to the full bridge of the correction circuit Substabilizer

The invention relates to a full bridge electronic ballast with complementary continuous current mode charging pump power factor correction (PFC) circuit, in particular to a voltage source (or current source) with complementary continuous current mode ) Full-bridge electronic ballast for charging pump PFC circuits.

With the advancement of lighting technology, electronic ballasts have gradually replaced the electromagnetic ballasts (Electromagnetic ballast) in the lighting market. Compared with electromagnetic ballasts, electronic ballasts have the advantages of small size, light weight and long life. They are very competitive in the lighting market, so electronic ballasts have great potential for development. However, in order to make the input current conform to the IEC 61000-3-2 Class C specification, an electronic ballast with a power factor correction function is commonly used for lighting equipment. At present, the electronic ballast with power factor correction function is mainly in two stages (such as the first figure). The two-stage electronic ballast includes an AC input power supply (providing an AC input voltage Vin) and a filter circuit (including an inductor). L _EMI and capacitor C _EMI ), a rectifier circuit (including diode Dbr1-Dbr4), a PFC stage (including inductor Lpfc, diode Dy, capacitor Cin and switch Spfc) and a full bridge inverter (including Inductance Ls, capacitors C _B and Cp, switches S1-S4 and lamps) have the following disadvantages:

(1) More components are required, and the circuit cost is high.

(2) The power factor correction circuit and the power stage all need to control the IC, and the circuit is complicated.

In order to solve the above shortcomings, a half bridge electronic ballast with a discontinuous current mode charging pump power correction circuit (such as the second figure) is developed. The half bridge electronic ballast with a discontinuous current mode charging pumping power correction circuit includes a PFC stage (including a PFC stage including the AC input power source, the filter circuit and the rectifying circuit in the first figure) A capacitor Cin and diode Dy), a half bridge inverter (including inductor Ls, capacitors C _B and Cp, switches S1-S2 and the lamp) and an output capacitor Cdc. However, the half bridge electronic ballast with the discontinuous current mode charging pump due to the correction circuit still has the following disadvantages:

(1) The circuit operates in discontinuous conduction mode, the input current has a large di/dt, and the electromagnetic noise interference is serious.

(2) The circuit has a large peak current, and circuit components with high current resistance must be used.

Since the half bridge architecture is not suitable in many medium and high power lighting applications, the present invention combines continuous current mode charging pump power factor correction techniques (such as the third and fourth figures) with a full bridge electronic ballast. The equivalent circuit of the continuous current mode voltage source charging pump power factor correction circuit as shown in the third figure has a rectified DC voltage source (providing a rectified voltage |Vin| and a current Iin), a diode Dx And Dy, the inductor Lpfc, the capacitor Cin, the voltage source (to provide a voltage Va), the load, and the output capacitor Cdc, and one of the output capacitors Cdc is across an output voltage Vbus. The equivalent circuit of the current source charging pump power factor correction circuit of the continuous current mode as shown in FIG. 4 is different from the third figure in that one diode Dx is missing, and the rectified DC voltage source is provided. a current Ipfc, the electricity The capacitor Cin has a voltage across the Vcin and is electrically connected in parallel with the diode Dy. The voltage source Va is replaced by a current source (current Is), and the output capacitor Cdc is used as an output voltage source (to provide a continuous current). Replaced by the output voltage Vbus). In this way, not only the components of the circuit structure and the driving circuit can be simplified, but also the power factor correction inductance and the input filter volume can be reduced by the charging pump power correction circuit, thereby reducing the circuit cost and reducing the circuit volume. And because the circuit operates in continuous current mode, it has less input current harmonic distortion, higher input current power factor, lower switching and diode conduction and switching losses, thereby improving overall circuit efficiency.

As a result of the job, the inventor, in view of the lack of the prior art, thought of and improved the idea of invention, and finally invented the "full bridge electronic ballast with complementary continuous current mode charging pump power correction circuit".

The main purpose of this case is to provide a full-bridge electronic ballast with complementary continuous current mode charging pump power factor correction circuit. Because it uses charging pump power factor correction technology, it has the following advantages: it can reduce the components required by the circuit. The number, which in turn reduces circuit cost, has low input current harmonic distortion and high power factor, and can reduce the size of components such as PFC inductors and EMI filters, as well as reduce switching losses and conduction losses of diodes.

Another main object of the present invention is to provide an electronic ballast including a first continuous current mode charging pump power factor correction (PFC) circuit, including a first inductor having a first end and a first diode. An anode and a cathode, wherein the anode is coupled to the first end of the first inductor, and a second diode has an anode and a cathode, wherein the anode is coupled to the first diode The cathode, and a first capacitor having a first end and a second end, wherein the first end is coupled to the anode of the second diode, and a clamping circuit includes a third diode Body having an anode and a cathode, wherein the cathode is coupled to the cathode of the second diode, and a fourth diode having an anode and a cathode, wherein the cathode is coupled to the third diode The anode, a second inductor, has a first end coupled to the cathode of the fourth diode and the second end of the first capacitor, and a second continuous current mode charging pump power factor correction (PFC The circuit includes a second capacitor having a first end and a second end, wherein the first end is coupled to the second end of the first capacitor, and a fifth diode having an anode and a a cathode, wherein the anode is coupled to the anode of the fourth diode, and the cathode is coupled to the second end of the second capacitor, and a full bridge inverter coupled to the first and second The continuous current mode charges the pump PFC circuit and produces an AC output voltage.

A main object of the present invention is to provide an electronic ballast including a first continuous current mode charging pump power factor correction (PFC) circuit, including a first inductor having a first end and a first diode. An anode and a cathode, wherein the anode is coupled to the first end of the first inductor, and a second diode has an anode and a cathode, wherein the anode is coupled to the cathode of the first diode And a first capacitor having a first end and a second end, wherein the first end is coupled to the anode of the second diode, and a second inductor is coupled to the first end The second end of the capacitor, a second continuous current mode charging pump power factor correction (PFC) circuit, comprising a second capacitor having a first end and a second end, wherein the first end is coupled to the first end a second end of a capacitor, and a a third diode having a cathode coupled to the second end of the second capacitor, and a full bridge inverter coupled to the first and second continuous current mode charging pump PFC circuits and generating An AC output voltage.

A further object of the present invention is to provide an electronic ballast including a first continuous current mode charging pump power factor correction (PFC) circuit, including a first inductor having a first end and a first diode. An anode and a cathode, wherein the anode is coupled to the first end of the first inductor, and a second diode has an anode and a cathode, wherein the anode is coupled to the cathode of the first diode And a first capacitor having a first end and a second end, wherein the first end is coupled to the anode of the second diode, and a clamping circuit includes a third diode An anode and a cathode, wherein the cathode is coupled to the cathode of the second diode, and a fourth diode having an anode and a cathode, wherein the cathode is coupled to the anode of the third diode a second inductor having a first end coupled to the cathode of the fourth diode and the second end of the first capacitor, and a full bridge inverter coupled to the first continuous current mode charging The pump PFC circuit and the clamp circuit generate an AC output voltage.

The above described objects, features, and advantages of the present invention will become more apparent and understood.

The continuous current mode charging pump power correction circuit provided by the invention comprises a power _factor correction inductor L _pfc , a charging pump capacitor C _in and an equivalent diode D _y , which can be divided according to different circuit connections There are two types of voltage source and current source, as shown in the foregoing third and fourth figures, wherein the voltage source type is mainly a series high frequency voltage source as a reference signal source, and the current source type is a parallel high frequency current. The source is used as a reference source, and both can achieve the effect of correction.

Figure 5 is a circuit diagram of a full bridge electronic ballast with a voltage source charging pump power factor correction in a complementary continuous current mode in accordance with a preferred embodiment of the present invention. In the fifth diagram, in addition to the AC input power source, the filter circuit, the rectifier circuit, the full bridge inverter, and the output capacitor Cdc shown in the second figure, in the foregoing first figure, The difference from the first figure is that the PFC stage in the first figure is replaced by a complementary continuous current mode charging pump PFC circuit, and the complementary continuous current mode voltage source charging pump PFC circuit includes inductors Lpfc and Lx, Diodes Dx, Dy1, Dy2, Dr1 and Dr2, and capacitors Cin1 and Cin2.

The full-bridge electronic ballast, shown in Figure 5, uses the previously mentioned charging pump power factor correction technology combined with a full-bridge electronic ballast to improve its power factor and achieve good harmonic distortion.

In the fifth figure, the electronic ballast includes a first continuous current mode charging pump power factor correction (PFC) circuit, including a first inductor Lpfc having a first end, a first diode Dx, An anode and a cathode, wherein the anode is coupled to the first end of the first inductor Lpfc, and a second diode Dy1 has an anode and a cathode, wherein the anode is coupled to the first diode Dx The cathode, and a first capacitor Cin1, has a first end and a second end, wherein the first end is coupled to the anode of the second diode Dy1, and a clamping circuit includes a third diode a body Dr1 having an anode and a cathode, wherein the cathode is coupled to the cathode of the second diode Dy1 to And a fourth diode Dr2 having an anode and a cathode, wherein the cathode is coupled to the anode of the third diode Dr1, and a second inductor Lx having a first end coupled to the fourth diode The cathode of the body Dr2 and the second end of the first capacitor Cin1, a second continuous current mode charging pump PFC circuit, including a second capacitor Cin2, having a first end and a second end, wherein the first end One end coupled to the second end of the first capacitor Cin1, and a fifth diode Dy2 having an anode and a cathode, wherein the anode is coupled to the anode of the fourth diode Dr2, and the cathode The second end coupled to the second capacitor Cin2, and a full bridge inverter coupled to the first and second continuous current mode charging pump PFC circuits and generating an AC output voltage.

The electronic ballast as shown in FIG. 5 further includes a filter circuit for receiving an AC input voltage, and a rectifier circuit coupled to the filter circuit, wherein the full bridge inverter device has a first input and a second input And a second end of the first inductor Lpfc and the second inductor Lx, the second end of the first inductor Lpfc and the second end of the second capacitor Cin2 are coupled to the rectifier circuit The second end of the second inductor Lx is coupled to the midpoint, the cathode of the second diode Dy1 is coupled to the first input end of the full bridge inverter, and the full bridge inverter The second input of the device is coupled to the anode of the fourth diode Dr2.

Referring to the electronic ballast shown in FIG. 5, the feature focus can be up-converted to include a first continuous current mode charging pump power factor correction (PFC) circuit, including a first inductor Lpfc, having a first a first diode Dx having an anode and a cathode, wherein the anode is coupled to the first end of the first inductor Lpfc, and a second diode Dy1 has an anode and a cathode, wherein the anode Anode coupled to the first a cathode of a diode Dx, and a first capacitor Cin1 having a first end and a second end, wherein the first end is coupled to the anode of the second diode Dy1, and a second inductor Lx The first end is coupled to the second end of the first capacitor Cin1, and the second continuous current mode charging pump PFC circuit includes a second capacitor Cin2 having a first end and a second end, wherein The first end is coupled to the second end of the first capacitor Cin1, and the third diode Dy2 has a cathode coupled to the second end of the second capacitor Cin2, and a full bridge inverter And coupled to the first and second continuous current mode charging pump PFC circuits and generating an AC output voltage.

In the fifth figure, the electronic ballast further includes a clamping circuit, wherein the third diode Dy2 further includes an anode, and the clamping circuit includes a fourth diode D11 having an anode and a cathode. The cathode is coupled to the cathode of the second diode Dy1, and the anode is coupled to the first end of the second inductor Lx, and a fifth diode Dr2 has an anode and a cathode, wherein The cathode is coupled to the anode of the fourth diode D1, and the anode is coupled to the anode of the third diode Dy2.

The electronic ballast as shown in FIG. 5 further includes a filter circuit for receiving an AC input voltage, a third capacitor Cdc and a rectifier circuit coupled to the filter circuit, wherein the full bridge inverter device is first The first inductor Lpfc and the second inductor Lx each have a second end, and the second end of the first inductor Lpfc is coupled to a second input terminal, a first output terminal, and a second output terminal. The second end of the second capacitor Cin2 is coupled to the rectifying circuit, the second end of the second inductor Lx is coupled to the midpoint, and the cathode of the second diode Dy1 is coupled to the full bridge inverter The first input of the device, The second input end of the full bridge inverter is coupled to the anode of the fifth diode Dr2, and the third capacitor Cdc is electrically connected in parallel to the first and the second of the full bridge inverter Two outputs. The third capacitor Cdc is an output capacitor.

The electronic ballast shown in the fifth figure may also be characterized as: a first continuous current mode charging pump power factor correction (PFC) circuit, including a first inductor Lpfc, having a first One end, a first diode Dx having an anode and a cathode, wherein the anode is coupled to the first end of the first inductor Lpfc, and a second diode Dy1 has an anode and a cathode, wherein The anode is coupled to the cathode of the first diode Dx, and a first capacitor Cin1 having a first end and a second end, wherein the first end is coupled to the anode of the second diode Dy1 a clamping circuit comprising a third diode Dr1 having an anode and a cathode, wherein the cathode is coupled to the cathode of the second diode Dy1 and a fourth diode Dr2 having an anode And a cathode, wherein the cathode is coupled to the anode of the third diode Dr1, a second inductor Lx having a first end coupled to the cathode of the fourth diode Dr2 and the first capacitor Cin1 The second end, and a full bridge inverter coupled to the first continuous current mode charging pump PFC Road and the clamping circuit, and generates an AC output voltage.

Referring to FIG. 5, the electronic ballast further includes a second continuous current mode charging pump power factor correction (PFC) circuit, including a second capacitor Cin2 having a first end and a second end, wherein the first The end is coupled to the second end of the first capacitor Cin1, and the fifth diode Dy2 has an anode and a cathode, wherein the anode is coupled to the anode of the fourth diode Dr2, and the cathode is coupled The second end of the second capacitor Cin2.

The electronic ballast as shown in FIG. 5 further includes a filter circuit for receiving an AC input voltage, and a rectifier circuit coupled to the filter circuit, wherein the full bridge inverter device has a first input and a second input And a second end of the first inductor Lpfc and the second inductor Lx, the second end of the first inductor Lpfc and the second end of the second capacitor Cin2 are coupled to the rectifier circuit The second end of the second inductor Lx is coupled to the midpoint, the cathode of the second diode Dy1 is coupled to the first input end of the full bridge inverter, and the full bridge inverter The second input of the device is coupled to the anode of the fourth diode Dr2.

As shown in the fifth figure, the electronic stabilizer has a PFC stage circuit composed of two sets of complementary charging pump power correction circuits, and the advantage is that the current chopping frequency on the PFC inductor is twice the operating frequency, so A smaller EMI filter can be used. Dr1~Dr2 is a clamped diode, which is mainly used to provide a flow path for the energy dissipation in the inductor when the switch is turned off. This can be used to provide a path of energy release and can be reduced. The time to resonate with the charging pump capacitor Lpfc, therefore, has the function of reducing the switching voltage stress. Dx is used to prevent the resonant current from flowing back to the power factor correction inductance (Lpfc) when there are two sets of symmetrical charging pump powers on the same side of the correction circuit.

Example

What is claimed is: 1. An electronic ballast comprising: a first continuous current mode charging pump power factor correction (PFC) circuit comprising: a first inductor having a first end; a first diode having an anode a cathode in which the anode is coupled The first end of the first inductor; a second diode having an anode and a cathode, wherein the anode is coupled to the cathode of the first diode; and a first capacitor having a first And a second end, wherein the first end is coupled to the anode of the second diode; a clamping circuit comprising: a third diode having an anode and a cathode, wherein the cathode is coupled to a cathode of the second diode; and a fourth diode having an anode and a cathode, wherein the cathode is coupled to the anode of the third diode; and a second inductor having a first end Coupling the cathode of the fourth diode with the second end of the first capacitor; a second continuous current mode charging pump power factor correction (PFC) circuit comprising: a second capacitor having a first And a second end, wherein the first end is coupled to the second end of the first capacitor; and a fifth diode having an anode and a cathode, wherein the anode is coupled to the fourth diode The anode, the cathode being coupled to the second end of the second capacitor; and a full bridge inverter coupled To the first and the second charging pump continuous current mode PFC circuit, and generates an AC output voltage.

2. The ballast according to embodiment 1 further comprising a filter circuit for receiving an AC input voltage, and a rectifier circuit coupled to the filter circuit, wherein the full bridge inverter device has a first and a second input End and a midpoint, The second inductor and the second inductor each have a second end, the second end of the first inductor and the second end of the second capacitor are coupled to the rectifier circuit, and the second end of the second inductor Coupled at the midpoint, the cathode of the second diode is coupled to the first input of the full bridge inverter, and the second input of the full bridge inverter is coupled to the fourth The anode of the diode.

3. An electronic ballast comprising: a first continuous current mode charging pump power factor correction (PFC) circuit comprising: a first inductor having a first end; a first diode having an anode a cathode, wherein the anode is coupled to the first end of the first inductor; a second diode having an anode and a cathode, wherein the anode is coupled to the cathode of the first diode; and a first a capacitor having a first end and a second end, wherein the first end is coupled to the anode of the second diode; a second inductor having a first end coupled to the first capacitor The second continuous current mode charging pump power factor correction (PFC) circuit includes: a second capacitor having a first end and a second end, wherein the first end is coupled to the first capacitor The second end; and a third diode having a cathode coupled to the second end of the second capacitor; and a full bridge inverter coupled to the first and second continuous current modes The pump PFC circuit is charged and an AC output voltage is generated.

4. The ballast according to any of the above embodiments further includes a clamping circuit, wherein the third diode further comprises an anode, and the clamping circuit comprises: a fourth diode having an anode and a cathode, wherein the cathode is coupled to the cathode of the second diode, and the anode is coupled to the first end of the second inductor; and a fifth diode having an anode and a cathode, wherein the cathode A cathode is coupled to the anode of the fourth diode, and the anode is coupled to the anode of the third diode.

The ballast according to any of the above embodiments further includes a filter circuit for receiving an AC input voltage, a third capacitor and a rectifier circuit coupled to the filter circuit, wherein the full bridge inverter device is a second input end, a first output and a second output end, and a midpoint, the first inductor and the second inductor each have a second end, the second end of the first inductor and the second The second end of the second capacitor is coupled to the rectifier circuit, the second end of the second inductor is coupled to the midpoint, and the cathode of the second diode is coupled to the first of the full bridge inverter An input end, the second input end of the full bridge inverter is coupled to the anode of the fifth diode, and the third capacitor is electrically connected in parallel to the first and the second bridge inverter Second output.

6. The ballast of any of the preceding embodiments, wherein the third capacitor is an output capacitor.

7. An electronic ballast comprising: a first continuous current mode charging pump power factor correction (PFC) circuit comprising: a first inductor having a first end; a first diode having an anode and a cathode, wherein the anode is coupled to the first end of the first inductor; and a second diode having an anode And a cathode, wherein the anode is coupled to the cathode of the first diode; and a first capacitor having a first end and a second end, wherein the first end is coupled to the second diode The clamping circuit includes: a third diode having an anode and a cathode, wherein the cathode is coupled to the cathode of the second diode; and a fourth diode having an anode And a cathode, wherein the cathode is coupled to the anode of the third diode; a second inductor having a first end coupled to the cathode of the fourth diode and the second end of the first capacitor And a full bridge inverter coupled to the first continuous current mode charging pump PFC circuit and the clamping circuit and generating an AC output voltage.

The ballast according to any of the above embodiments further includes a second continuous current mode charging pump power factor correction (PFC) circuit, including: a second capacitor having a first end and a second end, The first end is coupled to the second end of the first capacitor; and a fifth diode having an anode and a cathode, wherein the anode is coupled to the anode of the fourth diode, and the cathode Coupled to the second end of the second capacitor.

9. The ballast according to any of the above embodiments further comprising: receiving an exchange a filter circuit for inputting a voltage, and a rectifying circuit coupled to the filter circuit, wherein the full-bridge inverter device has a first input and a second input end and a midpoint, the first inductor and the second inductor respectively a second end, the second end of the first inductor and the second end of the second capacitor are coupled to the rectifier circuit, the second end of the second inductor is coupled to the midpoint, the second pole The cathode is coupled to the first input of the full bridge inverter, and the second input of the full bridge inverter is coupled to the anode of the fourth diode.

In summary, the present invention provides a full-bridge electronic ballast for a complementary continuous current mode charging pump power factor correction circuit. Since it uses a charging pump power factor correction technology, it has the following advantages: it can reduce the circuit required The number of components, which in turn reduces circuit cost, has low input current harmonic distortion and high power factor, and can reduce the size of components such as PFC inductors and EMI filters, as well as reduce switching losses and conduction losses of diodes. It is indeed progressive and novel.

Therefore, even though the present invention has been described in detail by the above-described embodiments, it can be modified by those skilled in the art, and is not intended to be protected as claimed.

The first figure shows a circuit diagram of a conventional two-stage electronic ballast; the second figure shows a circuit diagram of a conventional half-bridge electronic ballast with a discontinuous current mode charging pump power correction circuit Third diagram: a circuit diagram showing an equivalent circuit of a conventional continuous current mode voltage source charging pump power factor correction circuit; FIG. 4 is a circuit diagram showing an equivalent circuit of a conventional current source charging pump power factor correction circuit of a conventional continuous current mode; and a fifth diagram showing a preferred embodiment according to the present invention. A circuit diagram of a full-bridge electronic ballast with a complementary continuous current mode voltage source charging pump power factor correction.

Claims (9)

An electronic ballast comprising: a first continuous current mode charging pump power factor correction (PFC) circuit, comprising: a first inductor having a first end and a second end; a first diode, An anode and a cathode, wherein the anode is coupled to the first end of the first inductor; a second diode having an anode and a cathode, wherein the anode is coupled to the cathode of the first diode; And a first capacitor having a first end and a second end, wherein the first end is coupled to the anode of the second diode; a clamping circuit comprising: a third diode, having a An anode and a cathode, wherein the cathode is coupled to the cathode of the second diode; and a fourth diode having an anode and a cathode, wherein the cathode is coupled to the anode of the third diode; a second inductor having a first end and a second end, the first end being coupled to the cathode of the fourth diode and the second end of the first capacitor; a second continuous current mode charging A power factor correction (PFC) circuit includes: a second capacitor having a first end and a second end The first end is coupled to the second end of the first capacitor; and a fifth diode having an anode and a cathode, wherein the anode is coupled to the anode of the fourth diode, and the anode a cathode coupled to the second capacitor The second end; and a full bridge inverter, generating an AC output voltage, wherein the first input end of the full bridge inverter is coupled to the cathode of the second diode, and a second input And the first anode, the second output, and the midpoint of the second diode are coupled to the second end of the second inductor, the full bridge inverter includes a first NMOS having a first drain and a first source; a second NMOS having a second drain and a second source, the second drain being coupled to the first source a third NMOS having a third drain and a third source, the third drain and the first drain being coupled to the first input; and a fourth NMOS having a fourth a drain and a fourth source, the fourth drain and the third source are coupled to the second output; a third inductor having a first end and a second end, the third inductor The first end is coupled to the midpoint; the fourth capacitor has a first end and a second end, the first end of the fourth capacitor is coupled to the second end of the third inductor, the fourth capacitor The second end is coupled to the first output. The ballast of claim 1, further comprising a filter circuit for receiving an AC input voltage, and a rectifier circuit coupled to the filter circuit, the second end of the first inductor and the second capacitor The second end is coupled to the rectifier circuit. An electronic ballast comprising: a first continuous current mode charging pump power factor correction (PFC) The circuit includes: a first inductor having a first end and a second end; a first diode having an anode and a cathode, wherein the anode is coupled to the first end of the first inductor; a second diode having an anode and a cathode, wherein the anode is coupled to the cathode of the first diode; and a first capacitor having a first end and a second end, wherein the first end An anode coupled to the second diode; a second inductor having a first end and a second end, the first end being coupled to the second end of the first capacitor; a second continuous current mode The charging pump power factor correction (PFC) circuit includes: a second capacitor having a first end and a second end, wherein the first end is coupled to the second end of the first capacitor; and a fifth a diode having an anode and a cathode coupled to the second end of the second capacitor; and a full bridge inverter generating an AC output voltage, wherein the full bridge inverter An input end coupled to the cathode of the second diode, a second input end, and the anode of the fifth diode a first output terminal, a second output end, and a midpoint coupled to the second end of the second inductor, the full bridge inverter comprising: a first NMOS having a first drain And a first source; a second NMOS having a second drain and a second source, the second drain and the first source being coupled to the midpoint; a third NMOS having a third drain and a third source, the third drain and the first drain coupled to the first input; a fourth NMOS having a fourth drain and a a fourth source, the fourth source and the third source are coupled to the second output; a third inductor having a first end and a second end, the first end of the third inductor is coupled a fourth capacitor having a first end and a second end, the first end of the fourth capacitor being coupled to the second end of the third inductor, the second end of the fourth capacitor The end is coupled to the first output. The ballast of claim 3, further comprising a clamping circuit, the clamping circuit comprising: a third diode having an anode and a cathode, wherein the cathode is coupled to the second diode a cathode of the body, the anode being coupled to the first end of the second inductor; and a fourth diode having an anode and a cathode, wherein the cathode is coupled to the anode of the third diode And the anode is coupled to the anode of the fifth diode. The ballast of claim 4, further comprising a filter circuit for receiving an AC input voltage, a third capacitor and a rectifier circuit coupled to the filter circuit, the second end of the first inductor The second end of the second capacitor is coupled to the rectifier circuit, and the third capacitor is electrically connected in parallel to the first and second input ends of the full bridge inverter. The ballast of claim 5, wherein the third capacitor is an output capacitor. An electronic ballast comprising: a first continuous current mode charging pump power factor correction (PFC) circuit, comprising: a first inductor having a first end and a second end; a first diode, An anode and a cathode, wherein the anode is coupled to the first end of the first inductor; a second diode having an anode and a cathode, wherein the anode is coupled to the cathode of the first diode; And a first capacitor having a first end and a second end, wherein the first end is coupled to the anode of the second diode; a clamping circuit comprising: a third diode, having a An anode and a cathode, wherein the cathode is coupled to the cathode of the second diode; and a fourth diode having an anode and a cathode, wherein the cathode is coupled to the anode of the third diode; a second inductor having a first end and a second end, the first end being coupled to the cathode of the fourth diode and the second end of the first capacitor; and a full bridge inverter Generating an AC output voltage, wherein the full-bridge inverter device has a first input end, and the second second The cathode coupling, a second input end, the anode coupled to the fifth diode, a first output end, a second output end, and a midpoint, and the second end of the second inductor Coupling, the full-bridge inverter includes: a first NMOS having a first drain and a first source; a second NMOS having a second drain and a second source, the first a second drain is coupled to the first source; the third NMOS has a third drain and a third source, and the third drain and the first drain are coupled to the first input a fourth NMOS having a fourth drain and a fourth source, the fourth drain and the third source being coupled to the second output; a third inductor having a first end a second end, the first end of the third inductor is coupled to the midpoint; a fourth capacitor has a first end and a second end, the first end of the fourth capacitor is coupled to the third end The second end of the inductor, the second end of the fourth capacitor is coupled to the first output. The ballast of claim 7, further comprising a second continuous current mode charging pump power factor correction (PFC) circuit, comprising: a second capacitor having a first end and a second end, The first end is coupled to the second end of the first capacitor; and a fifth diode having an anode and a cathode, wherein the anode is coupled to the anode of the fourth diode, and the cathode Coupled to the second end of the second capacitor. The ballast of claim 8, further comprising a filter circuit for receiving an AC input voltage, and a rectifier circuit coupled to the filter circuit, the second end of the first inductor and the second capacitor The second end is coupled to the rectifier circuit.