CN203387399U - Low-standby power consumption active power factor correction module - Google Patents

Abstract

Disclosed in the utility model is a low-standby power consumption active power factor correction module employing a low-power consumption starting technology, a complete-period auxiliary power supply technology, a small-size modularization packaging design, and an active power factor correction module (APFC) technology. The provided module has the characteristics of high power factor and low standby power consumption and the like and can be directly applied to a traditional switching power supply, thereby solving problems of low power factor and high standby power consumption of the traditional power supply. An integrated control circuit is packaged into a small module; and thus functions of soft starting, under-voltage protection, input-output open-loop protection, over-voltage protection, over-current protection and over-power protection and the like are realized. Besides, the module only has two input pins and two output pins and thus can be used conveniently.

Description

A kind of active power factor correcting module of low standby power loss

Technical field

The utility model relates to the circuit of power factor correction field, is specially a kind of active power factor correcting module of low standby power loss.

Background technology

Along with the development of power electronic technology, various rectifiers and widely applying in all trades and professions with the power electronic equipment of rectifier.The Circuits System of this employing bridge rectifier and large capacitor filtering, the input power network current is the very steep burst pulse that rises and descend, and serious distortion occurs in current waveform, and current harmonic content is higher, and power factor is lower, can only reach 0.5～0.7.

For improving supply line's power factor, reduce the harmonic pollution of power consumption equipment to electrical network, it is necessary adding power factor correcting in power consumption equipment, although increased certain cost, but improved the utilance of electrical network electric energy, and reduced the construction cost of supply line.

Energy during standby consumes phenomenon and extensively is present in electric equipment products, and its total amount can not be ignored especially.According to studies show that, the energy consumed because of electric appliance standby accounts for 1.5% of home-use electric weight, and the stand-by power consumption of China is especially higher than this level.

Existing equipment power supply ubiquity stand-by power consumption is large, and generally all at 2～10 watts, some power supply products are used energy-saving chip to control can reduce stand-by power consumption, but increases the Power Management Design complexity, has also increased the power supply cost.At present, having a lot of companies to produce special-purpose power factor correction (PFC) chip can use, but integrated auxiliary power supply and to start the little active power factor correcting module of loss fewer.

The utility model content

For the problems referred to above, the purpose of this utility model is to provide a kind of active power factor correcting module of low standby power loss, and this module can be applied in the power supply of most of electronic equipments.

The technical scheme that the utility model adopts is:

A kind of active power factor correcting module of low standby power loss is characterized in that: include APFC, low-power consumption start-up circuit, complete period auxiliary power supply circuit;

Described APFC comprises the PFC chip that rectifier bridge, Boost converter, model are UCC28019A, described rectifier bridge input is introduced and is exchanged, and rectifier bridge output is divided into two-way ，Mei road all two output lines that access one by one respectively rectification bridge output end, and the output of two-way rectifier bridge accesses respectively Boost converter and PFC chip, described Boost converter comprises boost inductance L, diode D, resistance and switching tube Q, boost inductance L mono-termination enters on output line of rectifier bridge first via output, boost inductance L other end access diode D anode, resistance one termination enters the rectifier bridge first via and exports on another output line, the resistance other end, diode D negative electrode is exported as the Boost converter, and have access to load and be connected in parallel on the capacitor C in load between the output of Boost converter, between switching tube Q drain electrode access boost inductance L and diode D, switching tube Q source electrode access resistance is as an end of Boost converter output, switching tube Q grid access PFC chip, described PFC chip is by multiplier, current error amplifier CA, voltage error amplifier VA, comparison amplifier U1 forms, between input access load of voltage amplifier VA and capacitor C, another input access reference voltage V of voltage amplifier VA ref, input of voltage amplifier VA output access multiplier, another input of output line access multiplier of rectifier bridge the second tunnel output, the input of the output access current error amplifier CA of multiplier, another output line of another input access rectifier bridge the second tunnel output of current error amplifier CA, input of output access comparison amplifier U1 of current error amplifier CA, another input access sawtooth signal of comparison amplifier U1, the grid of switching tube Q in the output access Boost converter of comparison amplifier U1,

Described low-power consumption start-up circuit comprises switching tube Q1, triode Q2, the grid of switching tube Q1 is by the output of rectifier bridge in resistance R 2 access APFCs, the drain electrode of switching tube Q1 is by between starting resistance R1 access rectifier bridge output and resistance R 2, the source electrode access voltage VCC of switching tube Q1, the source electrode of switching tube Q1 is also by capacitor C 2 ground connection, the base stage of triode Q2 is by resistance R 4 access complete period auxiliary power supply circuit, the base stage of triode Q2 is also by the anode of a diode D1 of resistance R 4 accesses, the negative electrode access voltage VCC of diode D1, the grounded emitter of triode Q2, be connected to resistance R 5 between the emitter of triode Q2 and base stage, the collector electrode of triode Q2 is by between resistance R 3 access switching tube Q1 grids and resistance R 2, also access capacitor C parallel with one another 1 between resistance R3 on the emitter of triode Q2 and triode Q2 collector electrode, voltage stabilizing didoe D2,

Described complete period auxiliary power supply circuit comprises diode D3, diode D4, voltage stabilizing didoe D5, inductance L 2, capacitor C 3, capacitor C 4, capacitor C 5, in the Boost converter, the auxiliary winding of boost inductance L is extracted out respectively as output, auxiliary winding one end output accesses respectively diode D3 anode, diode D4 negative electrode, diode D3 negative electrode access inductance L 2 one ends, diode D3 negative electrode is also by the capacitor C 3 of series connection, capacitor C 4 ground connection, diode D4 plus earth, auxiliary winding other end output access capacitor C 3, between capacitor C 4, inductance L 2 other ends are as the resistance R 4 on triode Q2 base stage in complete period auxiliary power supply circuit output access low-power consumption start-up circuit, inductance L 2 other ends are also by voltage stabilizing didoe D5 parallel with one another, capacitor C 5 ground connection.

The active power factor correcting module of described a kind of low standby power loss, it is characterized in that: in APFC, the input of rectifier bridge has access to differential mode filter and common-mode filter, exchanges and sends into rectifier bridge by differential mode filter, common-mode filter.

The utility model has adopted low-power consumption start-up technique, complete period auxiliary power supply technology, Active Power Factor Correction (APFC) technology, and can adopt the design of reduced size modularized encapsulation.

The utlity model has following advantage:

1, start-up circuit is simple and reliable, and circuit loss is little.

2, the auxiliary power supply circuit design is simple, and directly from the boost inductance power taking, auxiliary power supply is stable.

3, the module package size is little, and it has the functions such as soft start, under-voltage protection, input and output open loop protection, overvoltage protection, overcurrent protection and overpower protection.Directly, in applied power source equipment, the rear class topological circuit can be selected the forms such as normal shock, flyback and half-bridge.

4, operating voltage range is wide, and output voltage is constant, power factor high (being greater than 0.99), and total harmonic distortion little (being less than 10%), can be applied to the design of appliances power source below 400 watts.

The accompanying drawing explanation

Fig. 1 is conventional start-up circuit figure.

Fig. 2 is the utility model low-power consumption start-up circuit figure.

Fig. 3 is the utility model complete period auxiliary power supply circuit diagram.

Fig. 4 is the utility model APFC theory diagram.

Fig. 5 is the utility model application circuit schematic diagram.

Embodiment

As Figure 2-Figure 5.A kind of active power factor correcting module of low standby power loss, include APFC, low-power consumption start-up circuit, complete period auxiliary power supply circuit;

APFC comprises the PFC chip 203 that rectifier bridge 201, Boost converter 202, model are UCC28019A, rectifier bridge 201 inputs are introduced and are exchanged, and rectifier bridge 201 outputs are divided into two-way ，Mei road all two output lines that access one by one respectively rectifier bridge 201 outputs, and 201 outputs of two-way rectifier bridge access respectively Boost converter 202 and PFC chip 203, Boost converter 202 comprises boost inductance L, diode D, resistance and switching tube Q, boost inductance L mono-termination enters on output line of rectifier bridge 201 first via outputs, boost inductance L other end access diode D anode, resistance one termination enters rectifier bridge 201 first via and exports on another output line, the resistance other end, diode D negative electrode is as 202 outputs of Boost converter, and have access to load and be connected in parallel on the capacitor C in load between 202 outputs of Boost converter, between switching tube Q drain electrode access boost inductance L and diode D, switching tube Q source electrode access resistance is as an end of Boost converter output, switching tube Q grid access PFC chip 203, PFC chip 203 is by multiplier, current error amplifier CA, voltage error amplifier VA, comparison amplifier U1 forms, between input access load of voltage amplifier VA and capacitor C, another input access reference voltage V of voltage amplifier VA ref, input of voltage amplifier VA output access multiplier, another input of output line access multiplier of rectifier bridge 201 second tunnel outputs, the input of the output access current error amplifier CA of multiplier, another output line of another input access rectifier bridge 201 second tunnel outputs of current error amplifier CA, input of output access comparison amplifier U1 of current error amplifier CA, another input access sawtooth signal of comparison amplifier U1, the grid of switching tube Q in the output access Boost converter 202 of comparison amplifier U1,

The low-power consumption start-up circuit comprises switching tube Q1, triode Q2, the grid of switching tube Q1 is by the output of rectifier bridge in resistance R 2 access APFCs, the drain electrode of switching tube Q1 is by between starting resistance R1 access rectifier bridge output and resistance R 2, the source electrode access voltage VCC of switching tube Q1, the source electrode of switching tube Q1 is also by capacitor C 2 ground connection, the base stage of triode Q2 is by resistance R 4 access complete period auxiliary power supply circuit, the base stage of triode Q2 is also by the anode of a diode D1 of resistance R 4 accesses, the negative electrode access voltage VCC of diode D1, the grounded emitter of triode Q2, be connected to resistance R 5 between the emitter of triode Q2 and base stage, the collector electrode of triode Q2 is by between resistance R 3 access switching tube Q1 grids and resistance R 2, also access capacitor C parallel with one another 1 between resistance R3 on the emitter of triode Q2 and triode Q2 collector electrode, voltage stabilizing didoe D2,

Complete period auxiliary power supply circuit comprises diode D3, diode D4, voltage stabilizing didoe D5, inductance L 2, capacitor C 3, capacitor C 4, capacitor C 5, in the Boost converter, the auxiliary winding of boost inductance L is extracted out respectively as output, auxiliary winding one end output accesses respectively diode D3 anode, diode D4 negative electrode, diode D3 negative electrode access inductance L 2 one ends, diode D3 negative electrode is also by the capacitor C 3 of series connection, capacitor C 4 ground connection, diode D4 plus earth, auxiliary winding other end output access capacitor C 3, between capacitor C 4, inductance L 2 other ends are as the resistance R 4 on triode Q2 base stage in complete period auxiliary power supply circuit output access low-power consumption start-up circuit, inductance L 2 other ends are also by voltage stabilizing didoe D5 parallel with one another, capacitor C 5 ground connection.

In APFC, the input of rectifier bridge has access to differential mode filter and common-mode filter, exchanges and sends into rectifier bridge by differential mode filter, common-mode filter.

Traditional start-up circuit as shown in Figure 1.In order to guarantee that chip normally starts, resistance R is selected moderate (needing to consider power problems).After chip enable, output voltage rises to setting voltage (generally being greater than 380V), and chip power supply is powered by auxiliary winding, consumes larger power on resistance R, and this is the topmost power consumption of standby.

As shown in Figure 2.During electrifying startup, in Fig. 4, rectifier bridge 201 output voltages are by 1 charging of 2 pairs of capacitor C of resistance R, until the electric capacity both end voltage is higher than the threshold voltage (Vgs) of switching tube, switching tube Q1 conducting.Voltage-stabiliser tube D2 protection Vgs is not more than 15V, and the rectifier bridge output voltage charges to capacitor C 2 fast by resistance R 1, until 203 normal operations (chip power supply voltage is VCC) of Fig. 4 chips.The module VD is elevated to rapidly 390V, and auxiliary winding starts chip power supply.Triode Q2 conducting, make Vgs lower than threshold voltage, and switching tube Q1 disconnects.At this moment control circuit is powered by auxiliary winding, by large resistance R 2, bears high pressure, and because resistance R 2 is got 10M Ω, the starting resistance loss is very little like this.

Under ideal case, because loop current is almost nil, switching loss and inductance coil and core loss can be ignored, and only have resistance R 2 consumed powers, and its two ends maximum voltage is (375V-VCC), and the power consumed on resistance is about 14 milliwatts.And conventional start-up circuit, in the maximum input voltage situation, the power consumed on starting resistance R1 is 1.3 watts, under ideal case, ignores switching tube and line loss, its stand-by power consumption obviously is greater than the design's power consumption.

As shown in Figure 3.The auxiliary power supply winding is extracted out by boost inductance, and establishing the rectifier bridge output voltage is U _iN, the boost inductance both end voltage is U _l, VD is U _o, establishing the boost inductance primary and secondary turn ratio is that n, auxiliary winding both end voltage are U _f.

As shown in Figure 4, when switching tube Q conducting, boost inductance L left end is being for just, and auxiliary winding upper end is for just.At this moment, auxiliary winding charges to C3 by D3, and boost inductance L both end voltage is:

$U_L=U_{\mathrm{IN}}$

Auxiliary winding both end voltage is:

$U_F=\frac{U_L}{n}=\frac{U_{\mathrm{IN}}}{n}$

When switching tube Q turn-offs, boost inductance L right-hand member is being for just, and auxiliary winding lower end is for just.At this moment, auxiliary winding charges to C4 by D4.The inductance L both end voltage is:

$U_L=U_O-U_{\mathrm{IN}}$

Auxiliary winding both end voltage is:

$U_F=\frac{U_L}{n}=\frac{U_O-U_{\mathrm{IN}}}{n}$

In a switch periods, the voltage of capacitor C 3 and the stack of C4 both end voltage is U _a, its value is:

$U_A=(\frac{U_{\mathrm{IN}}}{n}-U_{D3})+(\frac{U_O-U_{\mathrm{IN}}}{n}-U_{D4})=\frac{U_O}{n}-U_{D3}-{\mathrm{<figure-callout\; id="4"\; label="U\; D"\; filenames="HDA00003360406200023.png"\; state="\{\{state\}\}">U</figure-callout>}}_D=\frac{U_O}{n}-2{\mathrm{<figure-callout\; id="3"\; label="U\; D"\; filenames="HDA00003360406200023.png"\; state="\{\{state\}\}">U</figure-callout>}}_D$

In formula: U _d3, U _d3for the tube voltage drop of diode D3 and D4, two diodes are identical, U _d3=U _d4.

C5 both end voltage myopia is U _a, as can be seen here, as long as determine that output voltage and the turn ratio can obtain auxiliary winding voltage, not needing extra voltage-stabiliser tube to carry out voltage stabilizing to this boost voltage, thereby reduce the loss of power, voltage-stabiliser tube D5 prevents that voltage from overcharging.

As shown in Figure 4.This main circuit will comprise that rectifier bridge 201, Boost converter 202 and PFC chip 203(the utility model select the UCC28019A of TI company chip).Operation principle: single-phase alternating current obtains the single-phase pair of half-wave sine voltage signal of 100Hz/120Hz after rectifier bridge, then full-wave direct current voltage is carried out to the Boost conversion.The product of the detection signal of rectifier bridge output voltage and voltage error amplifier output signal produces the reference current signal, this reference current signal and inductive current sampled signal are exported after the current error amplifier relatively amplifies, then with sawtooth waveforms relatively after, output pwm signal driving switch pipe Q.When switching tube Q conducting, diode D oppositely ends, and input voltage is added in after by rectifier bridge on the input inductance L, and inductive current rises, and the rate of climb is directly proportional to input voltage; When switching tube Q cut-off, the D conducting, inductance L is charged to capacitor C by diode.

Circuit adopts double circle controling mode, electric current loop is as interior ring, the input voltage waveform sampling is given as the waveform that is input to electric current, with the output of multiplier as a reference, directly control the average current of boost inductance, force the inductive current follow current given, make the input current sineization, reduce Harmonics of Input, and follow input voltage phase.Voltage loop, as outer shroud, can realize the stable of output voltage.Form the APFC control circuit by chip 203 and peripheral component, the turn-on and turn-off of driving switch pipe Q, make input current average value approach sine wave from the current waveform of motion tracking full-wave direct current voltage, electrical network input, and the maintenance output voltage stabilization, thereby realize that constant voltage is exported and the purpose of raising power factor.

As shown in Figure 5.Module overall dimension is 60*60*30(mm).1 and 2 pin are ac input end (can be operated in 85～265VAC), for power supply has better Electro Magnetic Compatibility, need add necessary differential mode filtering and common mode filtering device at ac input end, 3 and 4 pin are that (output voltage is 390V to the module output, 3 pin are for just, 4 pin are for negative), should be connected to large storage capacitor at output.

Claims (2)

1. the active power factor correcting module of a low standby power loss, is characterized in that: include APFC, low-power consumption start-up circuit, complete period auxiliary power supply circuit;

Described APFC comprises the PFC chip that rectifier bridge, Boost converter, model are UCC28019A, described rectifier bridge input is introduced and is exchanged, and rectifier bridge output is divided into two-way ，Mei road all two output lines that access one by one respectively rectification bridge output end, and the output of two-way rectifier bridge accesses respectively Boost converter and PFC chip, described Boost converter comprises boost inductance L, diode D, resistance and switching tube Q, boost inductance L mono-termination enters on output line of rectifier bridge first via output, boost inductance L other end access diode D anode, resistance one termination enters the rectifier bridge first via and exports on another output line, the resistance other end, diode D negative electrode is exported as the Boost converter, and have access to load and be connected in parallel on the capacitor C in load between the output of Boost converter, between switching tube Q drain electrode access boost inductance L and diode D, switching tube Q source electrode access resistance is as an end of Boost converter output, switching tube Q grid access PFC chip, described PFC chip is by multiplier, current error amplifier CA, voltage error amplifier VA, comparison amplifier U1 forms, between input access load of voltage amplifier VA and capacitor C, another input access reference voltage V of voltage amplifier VA ref, input of voltage amplifier VA output access multiplier, another input of output line access multiplier of rectifier bridge the second tunnel output, the input of the output access current error amplifier CA of multiplier, another output line of another input access rectifier bridge the second tunnel output of current error amplifier CA, input of output access comparison amplifier U1 of current error amplifier CA, another input access sawtooth signal of comparison amplifier U1, the grid of switching tube Q in the output access Boost converter of comparison amplifier U1,

Described low-power consumption start-up circuit comprises switching tube Q1, triode Q2, the grid of switching tube Q1 is by the output of rectifier bridge in resistance R 2 access APFCs, the drain electrode of switching tube Q1 is by between starting resistance R1 access rectifier bridge output and resistance R 2, the source electrode access voltage VCC of switching tube Q1, the source electrode of switching tube Q1 is also by capacitor C 2 ground connection, the base stage of triode Q2 is by resistance R 4 access complete period auxiliary power supply circuit, the base stage of triode Q2 is also by the anode of a diode D1 of resistance R 4 accesses, the negative electrode access voltage VCC of diode D1, the grounded emitter of triode Q2, be connected to resistance R 5 between the emitter of triode Q2 and base stage, the collector electrode of triode Q2 is by between resistance R 3 access switching tube Q1 grids and resistance R 2, also access capacitor C parallel with one another 1 between resistance R3 on the emitter of triode Q2 and triode Q2 collector electrode, voltage stabilizing didoe D2,

Described complete period auxiliary power supply circuit comprises diode D3, diode D4, voltage stabilizing didoe D5, inductance L 2, capacitor C 3, capacitor C 4, capacitor C 5, in the Boost converter, extract out respectively as output at the auxiliary winding two ends of boost inductance L, auxiliary winding one end output accesses respectively diode D3 anode, diode D4 negative electrode, diode D3 negative electrode access inductance L 2 one ends, diode D3 negative electrode is also by the capacitor C 3 of series connection, capacitor C 4 ground connection, diode D4 plus earth, auxiliary winding other end output access capacitor C 3, between capacitor C 4, inductance L 2 other ends are as the resistance R 4 on triode Q2 base stage in complete period auxiliary power supply circuit output access low-power consumption start-up circuit, inductance L 2 other ends are also by voltage stabilizing didoe D5 parallel with one another, capacitor C 5 ground connection.

2. the active power factor correcting module of a kind of low standby power loss according to claim 1, it is characterized in that: in APFC, the input of rectifier bridge has access to differential mode filter and common-mode filter, exchanges and sends into rectifier bridge by differential mode filter, common-mode filter.

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