阅读说明：本技术 电压自动跟随滑频功率因数校正电路 (Voltage automatic following sliding frequency power factor correction circuit ) 是由 王磊 梁艳艳 于 2019-10-30 设计创作，主要内容包括：本发明涉及一种电压自动跟随滑频功率因数校正电路,属于无极灯领域。相比传统电压自动跟随滑频功率因数校正电路,增加了电压自动跟随检测电路,电流峰值检测电路,通过检测电路中的电压,自动匹配电流的峰值,当整个电路负载较低或者输入电压较高时,降低峰值电流的设定值,以此来提高开关管Q1的开关频率,将电流平均到整个电压周期,保证电流完全跟随电压。通过减少电路的峰值电流,一方面减少了元器件在电路中的损耗,提升了效率,减少了发热,提高了寿命,另一方面,通过提高频率,使电流波形极限接近正弦波形,极大降低了电路的谐波电流,使无极灯的更接近阻性负载特性,较少了电力的污染。(The invention relates to a voltage automatic following sliding frequency power factor correction circuit, and belongs to the field of electrodeless lamps. Compare traditional voltage automatic following slip frequency power factor correction circuit, increased voltage automatic following detection circuitry, current peak detection circuitry, through the voltage in the detection circuitry, the peak value of automatic matching electric current when whole circuit load is lower or input voltage is higher, reduces peak current's set value to this improves switching tube Q1's switching frequency, with the current average to whole voltage cycle, guarantees that the electric current follows voltage completely. By reducing the peak current of the circuit, on one hand, the loss of components in the circuit is reduced, the efficiency is improved, the heat emission is reduced, and the service life is prolonged, on the other hand, by improving the frequency, the limit of the current waveform is close to the sine waveform, the harmonic current of the circuit is greatly reduced, the electrodeless lamp is closer to the resistive load characteristic, and the electric power pollution is reduced.)

1. A voltage automatic following slip frequency power factor correction circuit is characterized in that an input pin 1 of a current transformer L2 is connected with a live wire of a mains supply, a pin 2 of the current transformer L2 is connected with a pin 1 of a current limiting resistor R1 and a pin 4 of a rectifier bridge BD1, a neutral wire N of the mains supply is connected with an input pin 3 of the current transformer L2, a pin 4 of the current transformer L2 is connected with a pin 1 of the current limiting resistor R2 and a pin 3 of a rectifier bridge BD1, a pin 5 and a pin 6 of an output detection pin of the current transformer L2 are respectively connected with a detection capacitor C2 and a detection capacitor C3 through a detection resistor R8 and a detection resistor R9, a pin 2 of the current limiting resistor R1 is connected with a pin 2 of a current limiting resistor R2 and then connected with a pin 7 of a singlechip IC1B and a pin 1 of a detection resistor R5, a pin 2 of the detection capacitor C2 and a pin 2 of the detection capacitor C3 are connected with a pin 1 of a pin BD of a singlechip IC1B, a pin 1 of the rectifier bridge is connected with a pin 1 of, an output 1 pin of the energy storage inductor L1 is connected with a 2 pin of a switching tube Q1 and a 1 pin of a freewheeling diode D2, a 2 pin of a freewheeling diode D2 is connected with a 2 pin of a starting diode D1 in parallel and then connected with a 1 pin of a voltage dividing resistor R6, a 1 pin of an energy storage capacitor C1 and a 2 pin of a singlechip IC1B, a 1 pin of a switching tube Q1 is connected with a 5 pin of a singlechip IC1B in series through a driving resistor R3, a 3 pin of a switching tube Q1 is connected with the ground in series through a detection resistor R4 and connected with a 4 pin of a singlechip IC1B, a 2 pin of a voltage dividing resistor R6 is connected with a 2 pin of a voltage dividing resistor R7 in parallel and then connected with a 3 pin of a singlechip IC1B, a 4 pin of an energy storage inductor L1 is connected with a 6 pin of a singlechip IC1B, a 2 pin of a rectifier bridge BD1 is connected with a 2 pin of a detection resistor R5, a pin of a singlechip IC1B, a pin 3 pin of an energy storage inductor L1, a pin of an energy storage.

2. The voltage auto-following sliding frequency power factor correction circuit according to claim, wherein the single chip microcomputer IC1B is an MCU chip with voltage detection.

3. The voltage auto-follow sliding frequency power factor correction circuit according to claim, wherein the switch transistor Q1 is an N-type high voltage MOS of 600V or more.

4. The power factor correction circuit according to claim, wherein the energy storage inductor L1 is a PQ-type transformer.

Technical Field

The invention relates to the field of electrodeless lamps, in particular to a voltage automatic following sliding frequency power factor correction circuit.

Background

As is well known, electrodeless lamps are widely used because of their advantages of high luminous intensity, high luminous efficiency, good color rendering, long life, and the like. When the electrodeless lamp runs at full power, the power factor can reach 0.99, the harmonic level meets the national standard, but when the dimming circuit and the electrodeless lamp are just started and do not run at full power, the power factor can be greatly reduced due to the reduction of input current, the insensitivity of a current detection circuit and the like, and along with the increase of input voltage, in some industrial power utilization 380V circuits, the power factor can be reduced, reactive loss is increased, resources are wasted, and harmonic interference also generates interference on a power grid.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the voltage automatic following sliding frequency power factor correction circuit, which is used for improving the power factors of light load and medium load in a dimming circuit, reducing harmonic waves and reducing reactive loss.

The technical scheme adopted by the invention for solving the technical problems is as follows: a voltage automatic following slip frequency power factor correction circuit is characterized in that an input pin 1 of a current transformer L2 is connected with a live wire L of a mains supply, a pin 2 of the current transformer L2 is connected with a pin 1 of a current limiting resistor R1 and a pin 4 of a rectifier bridge BD1, a neutral wire N of the mains supply is connected with an input pin 3 of the current transformer L2, a pin 4 of the current transformer L2 is connected with a pin 1 of the current limiting resistor R2 and a pin 3 of a rectifier bridge BD1, a pin 5 and a pin 6 of an output detection pin of the current transformer L2 are respectively connected with a detection capacitor C2 and a detection capacitor C3 through a detection resistor R8 and a detection resistor R9, a pin 2 of the current limiting resistor R1 is connected with a pin 2 of the current limiting resistor R2 and then connected with a pin 7 of a pin of a singlechip IC1B and a pin 1 of a detection resistor R5, a pin 2 of the detection capacitor C2 and a pin 2 of the detection capacitor C3 are connected with a pin BD1 of a pin B of a singlechip IC1 of a rectifier bridge, a pin 1 of a rectifier bridge, an output 1 pin of the energy storage inductor L1 is connected with a 2 pin of a switching tube Q1 and a 1 pin of a freewheeling diode D2, a 2 pin of a freewheeling diode D2 is connected with a 2 pin of a starting diode D1 in parallel and then connected with a 1 pin of a voltage dividing resistor R6, a 1 pin of an energy storage capacitor C1 and a 2 pin of a singlechip IC1B, a 1 pin of a switching tube Q1 is connected with a 5 pin of a singlechip IC1B in series through a driving resistor R3, a 3 pin of a switching tube Q1 is connected with the ground in series through a detection resistor R4 and connected with a 4 pin of a singlechip IC1B, a 2 pin of a voltage dividing resistor R6 is connected with a 2 pin of a voltage dividing resistor R7 in parallel and then connected with a 3 pin of a singlechip IC1B, a 4 pin of an energy storage inductor L1 is connected with a 6 pin of a singlechip IC1B, a 2 pin of a rectifier bridge BD1 is connected with a 2 pin of a detection resistor R5, a pin of a singlechip IC1B, a pin 3 pin of an energy storage inductor L1, a pin of an energy storage.

The invention can also be realized by the following measures: the singlechip IC1B is an MCU chip with voltage detection. The switching tube Q1 is an N-type high-voltage MOS with the voltage of 600V or more. The energy storage inductor L1 is a PQ-type transformer.

The invention has the advantages of reducing the loss of components in the circuit, improving the efficiency, reducing the heating, prolonging the service life and improving the power factors of light load and medium load in the dimming circuit. On the other hand, by increasing the frequency, the limit of the current waveform is close to the sine waveform, the harmonic current of the circuit is greatly reduced, the electrodeless lamp is closer to the resistive load characteristic, and the electric pollution is reduced.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic circuit diagram of the present invention.

In the figure, F1 is a fuse tube, L1 is an energy storage inductor, L2 is a current transformer, R1 and R2 are current limiting resistors, R3 is a driving resistor, R4 and R5. detection resistors, R6 and R7. divider resistors, R8 and R9. detection resistors, C1 is an energy storage capacitor, C2 and C3. detection capacitors, BD1 is a rectifier bridge, D1 is a starting diode, D2. is a freewheeling diode, Q1. is a switching tube, IC1B is a single chip microcomputer, N is a mains supply zero line, and L is a mains supply live line.

Detailed Description

In the figure, the 1 st pin of a fuse tube F1 is connected with a live wire L of a commercial power, the 2 nd pin of a fuse tube F1 is connected with an input pin 1 of a current transformer L2, the 2 nd pin of a current transformer L2 is connected with the 1 st pin of a current limiting resistor R1 and the 4 th pin of a rectifier bridge BD1, a commercial power zero line N is connected with an input pin 3 of a current transformer L2, the 4 th pin of the current transformer L2 is connected with the 1 st pin of a current limiting resistor R2 and the 3 rd pin of a rectifier bridge BD1, the 5 th pin and the 6 th pin of an output detection pin of the current transformer L2 are respectively connected with a detection capacitor C2 and a detection capacitor C3 through a detection resistor R8 and a detection resistor R9, the 2 nd pin of the current limiting resistor R1 is connected with the 2 nd pin of a current limiting resistor R9 and then is connected with the 7 th pin of an IC1B, the 1 st pin of the detection resistor R5, the 2 nd pin of the detection capacitor C2 and the 2 nd pin of the detection capacitor C3 are connected with the 1 st pin of a single chip microcomputer IC 6B, and the, an output 1 pin of the energy storage inductor L1 is connected with a 2 pin of a switching tube Q1 and a 1 pin of a freewheeling diode D2, a 2 pin of a freewheeling diode D2 is connected with a 2 pin of a starting diode D1 in parallel and then connected with a 1 pin of a voltage dividing resistor R6, a 1 pin of an energy storage capacitor C1 and a 2 pin of a singlechip IC1B, a 1 pin of a switching tube Q1 is connected with a 5 pin of a singlechip IC1B in series through a driving resistor R3, a 3 pin of a switching tube Q1 is connected with the ground in series through a detection resistor R4 and connected with a 4 pin of a singlechip IC1B, a 2 pin of a voltage dividing resistor R6 is connected with a 2 pin of a voltage dividing resistor R7 in parallel and then connected with a 3 pin of a singlechip IC1B, a 4 pin of an energy storage inductor L1 is connected with a 6 pin of a singlechip IC1B, a 2 pin of a rectifier bridge BD1 is connected with a 2 pin of a detection resistor R5, a pin of a singlechip IC1B, a pin 3 pin of an energy storage inductor L1, a pin of an energy storage.

When the circuit is in a sine wave, when the input voltage of a rectifier bridge BD1 is lower than the voltage of an energy storage capacitor C1, a switching tube Q1 is conducted, an energy storage inductor L1 enters an energy storage state, and a current circuit is ensured to pass through when the voltage exists, compared with a traditional power factor correction circuit, the circuit is provided with a current limiting resistor R1, a current limiting resistor R2 and a current detection circuit of a current transformer L2 circuit, the voltage value obtained by a pin 7 of a singlechip IC1B is consistent with the phase of a mains supply LN input, the current value of the current transformer L2 is reflected by a pin 2 of a detection capacitor C3, namely a pin 1 of the singlechip IC1B, the detection capacitor C2 and the voltage value of a pin 2 of the detection capacitor C3 are compared with the pin 7 of the singlechip IC1B after the pin voltage of the singlechip IC1B is changed, the pin 4 peak voltage of the singlechip IC1B is changed through internal calculation of the chip, and the peak current value of the switching tube Q1 is adjusted, meanwhile, 5 pins of the singlechip IC1B, namely the driving frequency of a switch tube Q1, are adjusted, when the voltage of 1 pin of the singlechip IC1B rises, the current flowing through a circuit increases, and at the moment, the singlechip IC1B reduces the working frequency by calculating the slip frequency so as to reduce the increase of the switching loss caused by high frequency; when the voltage of the pin 1 of the singlechip IC1B is reduced, the current flowing through the circuit is reduced, at the moment, the singlechip IC1B can automatically reduce the threshold value of the pin 4, the frequency of the switching tube Q1 is improved, the switching tube Q1 can ensure that the current passes through the whole period when the load is light, so that the electrodeless lamp with the dimming function can have very high power factors in the full voltage range of 90-480V, the electrodeless lamp with the dimming function can have very high power factors under different brightness, the harmonic interference of the electrodeless lamp is reduced, the efficiency is improved, and the loss is reduced.

Compared with the traditional voltage automatic following slip frequency power factor correction circuit, the invention adds the voltage automatic following detection circuit and the current peak value detection circuit, automatically matches the peak value of the current through the voltage in the detection circuit, and reduces the set value of the peak current when the load of the whole circuit is lower or the input voltage is higher, thereby improving the switching frequency of the switching tube Q1, averaging the current to the whole voltage period and ensuring that the current completely follows the voltage.

By reducing the peak current of the circuit, on one hand, the loss of components in the circuit is reduced, the efficiency is improved, the heat emission is reduced, and the service life is prolonged, on the other hand, by improving the frequency, the limit of the current waveform is close to the sine waveform, the harmonic current of the circuit is greatly reduced, the electrodeless lamp is closer to the resistive load characteristic, and the electric power pollution is reduced.

The voltage automatic following sliding frequency power factor correction circuit has fewer added devices in use compared with the traditional power factor correction circuit, the influence on cost and space is almost zero, the power factor can be improved by 2-5 points, and the energy is saved by 3%.