WO2010017662A1

WO2010017662A1 - Power saving device

Info

Publication number: WO2010017662A1
Application number: PCT/CN2008/001471
Authority: WO
Inventors: 吕淑明; 张生
Original assignee: Lv Shuming; Zhang Sheng
Priority date: 2008-08-15
Filing date: 2008-08-15
Publication date: 2010-02-18

Abstract

A power saving device (1000) connected with a load in parallel. The power saving device (1000) includes a power saving module (100), a feedback module (200), a rectification module (300) and a pulse width modulation module (400). The power saving module (100) includes a first capacitor set (C1, C2), a second capacitor set (C3, C4), a first inductor (L1), a second inductor (L2), a third inductor (L3), and a fourth inductor (L4). The feedback module (200) includes a fifth inductor (L3′) and a sixth inductor (L4′) connected in series. The fifth inductor (L3′) is magnetically coupled with the third inductor (L3). The sixth inductor (L4′) is magnetically coupled with the fourth inductor (L4).

Description

Power saving device

The utility model relates to a power saving device, in particular to an active power factor correction type power saving device. Background technique

When a non-pure resistive load (including capacitive and inductive loads) is connected to the grid, the voltage across the circuit is generally out of phase with the current in it. In a capacitive load, the voltage lags behind the current, and in an inductive load, the current lags the voltage. The input power of the circuit (ie, apparent power) is the sum of active power and reactive power. The ratio of active power to apparent power is the power factor. The power factor is low, that is, when the reactive power is too large, it will cause waste of electric energy.

Utility model content

In order to reduce the reactive power caused by the non-pure resistive load and provide the power factor of the power grid, thereby saving power, the utility model provides a power saving device capable of determining the power of the power grid by determining the phase relationship between the voltage and the current in the circuit. The factor is corrected.

The power saving device of the present invention includes: a power saving module, including a first capacitor group, a second capacitor group, a first inductor, a second inductor, a third inductor, and a fourth inductor, wherein the first capacitor group and the The first inductor is connected in series, the second capacitor group is connected in series with the second inductor, the first capacitor group and the second capacitor group have a first common end, and the first inductor and the second inductor have a second common end, the first end of the third inductor is connected to the second common end, the first end of the fourth inductor is connected to the first common end, and the feedback module comprises a fifth inductor connected in series and a sixth inductor, the fifth and sixth inductors are magnetically coupled to the third and fourth inductors of the power saving module, respectively; a rectifying module connected to the second end of the third inductor and the first Between the second ends of the four inductors; and a pulse position modulation module coupled to the feedback module. When the load is capacitive, the power-saving module exhibits an inductive reactance through adjustment of the feedback module, the rectifier module, and the pulse position modulation module; conversely, when the load exhibits inductivity, the power-saving module passes through the feedback module, the rectifier module, and the pulse position. The modulation module is adjusted to exhibit a capacitive reactance, so that the load seen by the grid is generally purely resistive.

The utility model has the beneficial effects that after the power saving device of the utility model is connected in parallel at both ends of the load, the power factor of the power grid can reach 0.97 or more, the capacity of the power distribution system is increased, and the electric energy is greatly saved.

DRAWINGS

1 is a view showing a state of use of the power saving device of the present invention;

Figure 2 shows a schematic diagram of the power saving device of the present invention;

Fig. 3 shows a circuit diagram of an embodiment of the power saving device of the present invention. detailed description

Fig. 1 is a view showing a state of use of the power saving device of the present invention. As shown in Figure 1, in use, the power saver 1000 is connected in parallel across the load.

Fig. 2 shows a schematic diagram of the power saving device of the present invention. As shown in FIG. 2, the power saving device 1000 of the present invention includes a power saving module 100, a feedback module 200, a rectifier module 300, and a pulse position modulation module 400.

The AC voltage signal from the power grid sequentially enters the power saving module 100, the rectifier module 300, and the pulse position modulation module 400. The pulse position modulation module 400 adjusts the reactance of the power saving module 100 by controlling the current flowing through the feedback module 200. When the load exhibits capacitiveness, the power saving module 100 exhibits an inductive reactance by adjustment of the pulse position modulation module 400 and the feedback module 200; when the load exhibits inductivity, the power saving module 100 passes the pulse position modulation module 400 and the feedback module 200 The adjustment shows a capacitive reactance. As a result, the load seen by the grid is generally purely resistive.

Optionally, in order to shield the electromagnetic radiation generated by the power saving device during operation from the utility power network, thereby ensuring that the power saving device does not affect other electrical appliances during operation and prevent interference to the municipal power grid, the section of the present invention The electrical device can also include an electromagnetic interference suppression module coupled between the power save module 100 and the rectifier module 300. In addition, the load connected in parallel with the power-saving device generates a pulse current, that is, a surge current, at the moment of starting. This inrush current can typically be as much as seven times the rated current of the load, thus reducing the life of the load. In order to reduce the impact of the surge current on the load, the power saving device of the present invention may further include a suppression surge current module connected between the rectifier module 300 and the pulse position modulation module 400.

Fig. 3 shows a circuit diagram of a preferred embodiment of the power saving device of the present invention. As shown in FIG. 3, in use, the power saving device 1000 is connected in parallel between the first end L and the second end N of the power grid, wherein the second end N is a ground terminal. The power saving device 1000 includes a power saving module 100, a feedback module 200, an electromagnetic interference suppression module 500, a rectifier module 300, a surge suppression current module 600, and a pulse position modulation module 400.

The power saving module 100 includes a capacitor (^ - ₄ and an inductor 1^ - L ₄ . It should be understood that the number of capacitors and inductors in the power saving module 100 shown in FIG. 3 and the manner of connection thereof are schematic rather than limiting. For example, the power saving module 100 may also include only a circuit in which a capacitor and an inductor are connected in series.

Alternatively, the inductor I, L _2, respectively, and are magnetically coupled inductors Li, L _2, to absorb the energy-saving devices in a strong surge current generated by the moment of starting. Among them, the inductances 1^ and 1^ ₂ are 2.13H, the number of turns is 150匝, the inductance, and L ₂ are 0.3H, and the number of turns is 14匝.

The feedback module 200 includes an inductor 100, respectively, in the inductance L ₃ and L ₄ are magnetically coupled with the power-saving module L _3, and L _4,. The inductors L ₃ and L _{4 are} connected in series to one end of the pulse position modulation module 400 and the other end to the surge suppression current module 600.

Electromagnetic interference suppression module 500 comprises a differential circuit by the resistor R !, capacitors C ₅ and C ₆ and an inductor L ₅ thereof. The electromagnetic interference suppression module 500 shields the electromagnetic radiation generated by the power saving device during operation from the utility power network, thereby ensuring that the power saving device does not affect other electrical appliances during operation, and prevents interference to the municipal power grid.

The rectifier module 300 includes a full bridge rectifier circuit composed of diodes VD!, VD ₂ , VD _3, and VD ₄ , wherein the diodes VD , VD ₂ , VD _{3 ,} and VD ₄ may be rectifier diodes of the type 1N4007. It should be noted that, in addition to the full bridge rectification mode, the rectifier module 300 can also be implemented in other manners. Since this is well known to those skilled in the art, it is not mentioned here.

The suppression surge current module 600 includes a freewheeling circuit 610 and an integration circuit 620. Freewheeling Circuit 610 includes a capacitor C _7, C _8, and the diode _{_{_{VD 5, VD 6, VD 7}}} , for the output rectifier current 300 more smooth, thereby improving the power factor of the power saving device itself. The capacitors C ₇ and C ₈ may be electrolytic capacitors of the type CD121Z. Integrating circuit 620 comprises a capacitor C _9,. And resistors R ₂ , R ₃ . In order to better absorb the inrush current, the resistor R ₄ can also be connected in parallel across the integrating circuit 620. When a surge current occurs in the circuit, the components R ₃ , ( _3⁄4 and d) of the inrush current module 600 are suppressed, and the surge current is absorbed to ensure the stability of the circuit. The capacitances C ₉ and C _{1 () have a} value of 0.1. y F/630V, resistor 1 ₂ and the value is 290k Ω.

The pulse position modulation module 400 includes a control chip 410, a thyristor 420, a Zener diode 430, resistors R ₅ and R ₆ , and a capacitor Cu - C ₁₃ .

The control chip 410 can be a NE555P time base oscillation IC chip (hereinafter referred to as NE555P chip). The reference frequency of the NE555P chip 410 is 76 Hz, and pins 1-8 are included from top to bottom. The first leg of the NE555P chip 410 is grounded, the third leg is connected to the control electrode of the thyristor 420, the eighth pin is the pulse modulation signal input terminal, and the resistor R ₆ is connected between the seventh pin and the eighth pin, the fifth pin and Pin 6 is connected to the anode of diode VD ₄ via capacitors C ₁₂ and C ₁₃ , respectively.

The anode of the thyristor 420 is connected to one end of the inductor L ₄ , the cathode is connected to the anode of the diode VD ₄ , and the control pole is connected to the third leg of the NE555P chip 410 . The anode of the Zener diode 430 is connected to the first leg of the NE555P chip 410, and the cathode is connected to the eighth leg of the NE555P chip 410. '

The working principle of the power saving device of the present invention will be described below with reference to FIG.

The grid voltage sequentially enters the power saving module 100, the electromagnetic interference suppression module 500, and the rectification module 300, and is rectified by the rectification module 300 to obtain a pulsating DC voltage waveform related to the voltage and current phases of the grid. Thereafter, the pulsating DC voltage waveform enters the suppression surge current module 600. This waveform enters the suppression surge current module 600 and passes through resistor R ₅ and capacitor C! j is divided, and is limited by a Zener diode 430 connected to the 1st pin (ground) of the NE555P chip 410 to obtain a sample signal related to the grid voltage and current phase. Thereafter, the sampling signal enters the eighth pin (pulse modulation signal input terminal) of the NE555P chip 410. The integrating circuit 620 and the thyristor 420 together form a ground circuit of the inductors L ₃ , and L ₄ , and the pulse position modulation module 400 composed of the NE555P chip triggers the operation of the thyristor 420.

Inductors L ₃ , and L ₄ , the current flowing inside can control the magnetic saturation of the inner core of the inductors L ₃ and L ₄ And the state, thereby changing the inductance of L ₃ and L ₄ . Since the power saving module 100 includes the capacitances d, C ₂ , C ₃ , C ₄ and the inductances L ₂ , L ₃ , L ₄ , changes in the inductances L ₃ and L ₄ will cause the reactance of the power saving module 10 to change. When the reactance X is capacitive, the inductivity of the inductive load can be compensated; conversely, when the reactance X is inductive, the capacitiveness of the capacitive load can be compensated.

The pulse position modulation module 400 activates the thyristor 420 according to the sampling signal obtained by the resistor R ₅ and the capacitor C „, and adjusts the current flowing in the inductors L ₃ and L ₄ together with the integrating circuit 620 to adjust the inductance L ₃ , The inductance of L ₄ is used for the purpose of controlling the reactance of the power saving module. The result of the adjustment will be fed back to the pulse position modulation module 400 through the integration circuit 620 and the sampling signal of the resistor R ₅ and the capacitor.

Claims

Claim

A power saving device for use in parallel with a load, comprising:

The power saving module includes a first capacitor group, a second capacitor group, a first inductor, a second inductor, a third inductor, and a fourth inductor, wherein the first capacitor group is connected in series with the first inductor, and the second The capacitor group is connected in series with the second inductor, the first capacitor group and the second capacitor group have a first common end, and the first inductor and the second inductor have a second common end, the third The first end of the inductor is connected to the second common end, and the first end of the fourth inductor is connected to the first common end;

a feedback module, comprising: a fifth inductor and a sixth inductor connected in series, wherein the fifth and sixth inductors are magnetically coupled to the third and fourth inductors of the power saving module, respectively;

a rectifier module connected between the second end of the third inductor and the second end of the fourth inductor;

A pulse position modulation module coupled to the feedback module.

2. The power saving device of claim 1, further comprising an electromagnetic interference suppression module coupled between the power saving module and the rectifier module.

The power saving device according to claim 1 or 2, further comprising a suppression surge current module connected between the rectifier module and the pulse position modulation module.

4. The power saving device according to claim 3, wherein the suppression surge current module comprises a freewheeling circuit and an integrating circuit.

The power saving device according to claim 4, wherein one end of the fifth inductor is connected to the integrating circuit, and the other end is connected to the sixth inductor.

The power saving device according to claim 5, wherein one end of the sixth inductor is connected to the fifth inductor, and the other end is connected to an anode of the thyristor.

The power saving device according to claim 1, wherein the pulse position modulation chip is a NE555P time base oscillation chip.

8. The power saving device according to claim 1, wherein the first and second capacitor groups respectively comprise two capacitors connected in parallel with each other.