WO2009115024A1

WO2009115024A1 - A power saving device for alternating current electrical appliances and a manufacturing method thereof

Info

Publication number: WO2009115024A1
Application number: PCT/CN2009/070796
Authority: WO
Inventors: 王尺
Original assignee: Wang Chi
Priority date: 2008-03-17
Filing date: 2009-03-16
Publication date: 2009-09-24
Also published as: CN101247074A; CN101247074B

Abstract

A power saving device for alternating current electrical appliances and a manufacturing method thereof. The power saving device for alternating current electrical appliances includes a switch power supply circuit (1) and a high frequency chopper circuit (2), and also includes an impedance matching circuit (3). A mains supply is inputted into the switch power supply circuit (1), the output of the switch power supply circuit (1) is supplied to the high frequency chopper circuit (2), the output of the high frequency chopper circuit (2) is electrically connected to the impedance matching circuit (3), and the high frequency chopper circuit (2) supplies a power supply to the impedance matching circuit (3) connected with the output of the high frequency chopper circuit (2) in parallel.

Description

Power saving device and manufacturing method of alternating current electrical appliance

The present invention relates to the field of energy saving technologies, and in particular to a power saving device and a manufacturing method for an alternating current electrical appliance. Background technique

Sinusoidal alternating current In an ideal state, the voltage or current that changes sinusoidally over time is collectively referred to as sinusoidal alternating current. In practical applications, due to many factors such as power supply and use environment, the AC power actually used by users is not clean. In the user's power circuit, there is a phase difference between the current or the voltage, which is called the power angle φ. In the user's power circuit, the user uses electricity.

Active power = voltage X current X power factor (COS (p), unit W, (1) electric power = total active power X time, unit KW.h, (2) In (1), when the voltage is constant, If COS (p = l, then the current is minimum. When COS (p value decreases from 1 to 0.4, the current is constantly increasing. This will cause the line to heat up, and the over-distribution heat of the consumer device will cause a large amount of electrical energy to be converted into heat. Consumed in vain. Due to the presence of impurities (transients, etc.) and interference (harmonics, etc.) in the grid, the user's meter will produce errors, over-measurement, up to 18% error; impurities and interference will also use electrical equipment The temperature rises, the efficiency decreases, and the additional consumption of electricity is increased by 2-8%. The electric equipment generates a large amount of electric sparks when it is turned on and off, and accumulates oxidized carbon which hinders normal power supply at the switch and the electric line. The film layer (such as the black trace on the switch), the presence of an oxidized carbon film layer per ohmic impedance, will reduce the efficiency of electrical equipment by 13%, increase More than 8% of the power loss, due to the decline in the efficiency of electrical appliances, so that a part of the power is not used effectively, resulting in a waste of up to 2-7%. It can be seen that to save power, the total active power in the user's power circuit must be reduced. To reduce the total active power, the power environment must be improved first.

In the prior art, since most of the commonly used AC appliances have low utilization of electric energy, waste of valuable energy is created. Summary of the invention

The technical problem to be solved by the present invention is to provide a power saving device for an AC electric appliance which can effectively utilize reactive current, improve power factor, reduce power loss, and save energy while ensuring normal operation of the electric appliance.

The technical solution adopted by the present invention is: a power saving device for an AC electrical appliance, comprising: a switching power supply circuit, a high frequency chopper circuit, and an impedance matching circuit, wherein the mains power is input to the switching power supply circuit, the switch An output of the power circuit is coupled to the high frequency chopper circuit, an output of the high frequency chopper circuit is electrically coupled to an impedance matching circuit, and the high frequency chopper circuit is impedance matched in parallel with the output of the high frequency chopper circuit The circuit provides an electrical power source.

The high frequency chopper circuit has an operating frequency range of 40-120 KC.

The optimal operating frequency of the high frequency chopper circuit is 80KC.

The impedance matching circuit is composed of a series resonant reactance unit and a load electric appliance in series.

The load electric appliance group in the impedance matching circuit is composed of 1 to 4 electric appliances having the same rated voltage. The impedance matching circuit is added to the matched series resonant reactance to form a series resonant circuit with the load electrical device, and the resonant frequency of each impedance matching circuit is different, and each series resonant circuit is connected in parallel to become a resonant frequency after the overall load The high frequency chopper circuit has the same operating frequency.

The method for manufacturing a power saving device for an AC appliance, the determination of the overall operating frequency of the high frequency chopper circuit and the impedance matching circuit includes the following steps:

(1) determining an operating frequency of the high frequency chopper circuit;

(2) adjusting, according to the determined operating frequency of the high frequency chopper circuit, the value of the matched series resonant reactance added to each of the impedance matching circuits, or adjusting the value of the load reactance of the circuit;

(3) when each of the load consumers is operating normally, monitoring the value of the AC input current, adjusting each of the impedance matching circuits to add a value of the matched series resonant reactance, when measuring the AC input current When the value is minimum, the operating frequency of the high frequency chopper circuit is the same as the overall operating frequency of the impedance matching circuit.

The determination of the overall operating frequency of the high frequency chopper circuit and the impedance matching circuit includes the following steps:

(1) determining, by calculation of the load reactance, a value of each of the impedance matching circuits added to the matched series resonant reactance;

(2) adjusting a working frequency of the high frequency chopper circuit according to each of the determined impedance matching circuits by adding a value of the matched series resonant reactance;

(3) When each of the load consumers is in normal working condition, monitor the AC input a value of the incoming current, adjusting an operating frequency of the high frequency chopper circuit, when the value of the measured alternating current input current is minimum, an operating frequency of the high frequency chopper circuit is the same as an overall operating frequency of the impedance matching circuit .

The invention has the beneficial effects that: the invention is compensated by using a high-frequency switching power supply, a high-frequency chopper circuit and a series reactance, and can stabilize the phase difference between the voltage, the trimming current and the voltage, can smooth the current, prevent the current convex wave, and eliminate The waste caused by the clutter can effectively utilize the reactive current, improve the power factor, and reduce the power loss in the case of ensuring the normal operation of the electric appliance, thereby achieving the effect of energy saving. DRAWINGS

Figure 1 is a block diagram showing the composition of the present invention;

2 is a schematic diagram of an impedance matching circuit composed of a series resonant reactance and an alternating current electrical device of the present invention;

3 is a schematic diagram of an impedance matching circuit composed of a series resonant inductor and a capacitive load alternating current electrical device of the present invention;

4 is a schematic diagram of an impedance matching circuit composed of a series resonant capacitor and an inductive load AC device of the present invention;

5 is a schematic diagram of an impedance matching circuit composed of a series resonant inductor and a resistive load alternating current electrical device of the present invention;

6 is a schematic diagram of an impedance matching circuit composed of a series resonant reactance unit of the present invention and a plurality of sets of different load AC devices;

Figure 7 is a diagram showing the different types of reactances of the present invention and different sets of different nature load AC power Schematic diagram of the total impedance matching circuit in parallel with the impedance matching circuit.

In the picture:

1: Switching power supply circuit 2: High frequency chopper circuit

3: Impedance matching circuit 4: Series resonant reactance unit

5: AC load electrical appliances

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Conventional electrical appliances (e.g., electric light sources) are electrically matched (e.g., electric light lines) to match the mains. Due to the limitations of the mains, voltage, frequency and other factors, the use of electrical appliances can not achieve better conversion efficiency (such as photoelectric conversion, electrothermal conversion, etc.). The invention adopts a switching power supply circuit 1, a high frequency chopper circuit 2, and matches the electric appliance (or light source) according to the physical characteristics of the load electric appliance 5 itself, so that a better conversion efficiency can be obtained. The switching power supply can not only obtain a small input power from the commercial power, but also meet the normal operation of the load electrical appliance 5, and meet various requirements of the power grid and the utility power, and the load electrical appliance 5 is operated by the invention. The portion of the current that cannot be utilized is captured back, effectively utilizing reactive current.

The product of current and voltage VICOS (p is called active power (unit is W), and the product of current and voltage VI is called apparent power (in VA). The ratio of active power to apparent power is called power factor PF (Power) Factor).

PF=W/VA=VACOSe/VA=COS0

Regardless of the active power or reactive power, the generator is supplied by the transmission network and the distribution line, but the electricity consumption calculated by the electricity meter is only the active power part. Active power also includes no The voltage drop of the working current in the line and the line loss. The total current 1 = active current 11 + reactive current 12, if it can effectively reduce the power factor of the load, effectively use the reactive current 12 to supply the appliance to achieve energy saving. The capacitive load can provide the reactive power required for the inductive load, because the current of the inductive load is behind the terminal voltage, that is, the power factor is hysteresis, and the current of the capacitive load exceeds the front-end voltage, that is, the power factor leads, and there exists between the two. Complementary characteristics. In the user's power circuit, when the voltage leads the current angle φ, the circuit is inductive, called the inductive load loop. When the current leads the voltage angle φ, the circuit is capacitive, called the capacitive load loop.

1 is a schematic block diagram of the composition of the present invention. As shown in FIG. 1, the working principle of the present invention is as follows: 220V50HZ or 110V60HZ alternating current, after rectification with high quality switching power supply circuit 1, high frequency chopper circuit 2, will be user The current waveform changed by the load loop operation is effectively improved, basically reaches a sine wave, and the power factor is increased to 0.98 or more, and the DC voltage is boosted by the high frequency chopper circuit 2 to reach each load electric appliance of the user load circuit. The voltage required for the job. Under the fluctuation of the mains input voltage ±30%, the DC output voltage of the switching power supply circuit 1 remains substantially unchanged. After high-frequency rectification and filtering of the DC voltage, a high-frequency positive-negative symmetrical AC voltage is obtained by the high-frequency chopper circuit 2, and the basic high-frequency chopper circuit 2 can be a half bridge, a full bridge, and a resonance. Circuits, etc. Regardless of the type of circuit used, both the positive and negative half-cycle symmetrical high-frequency alternating currents are used when the user's load circuit is operating. The output of the high frequency chopper circuit 2 can be simultaneously output to multiple sets of impedance matching circuits for power supply. The number of sets of AC load electric appliances depends on the output power of the high frequency chopper circuit 2 and the power of the AC load electric appliance. Its calculation method:

The output power of the high frequency chopper circuit 2 is W = 1.2 Wd. Wd is the sum of the power of the AC load device.

2 is a schematic diagram of an impedance matching circuit composed of a series resonant reactance and an alternating current electrical device according to the present invention; and FIG. 5 is a schematic diagram of an impedance matching circuit composed of a series resonant inductor and a resistive load alternating current electrical device according to the present invention; It can be shown that the AC load electric appliance 5 in each set of impedance matching circuit can be 1 to 4, and the series resonant reactance unit and the AC electric appliance in each set of impedance matching circuits are connected in series with each other, and the number thereof mainly depends on the high frequency 斩. The peak and peak value of the high-frequency voltage output by the wave circuit 2, and the calculation method thereof:

Number of AC load appliances in each group n=0.6Vpp/VD

Vpp: output voltage peak and peak of high frequency chopper circuit

VD: rated voltage of electrical load for AC load in each series of series connection

Each set of series-connected impedance matching circuit 3 is added to the matched series resonant reactance and the AC load electric device 5 to form a series resonant circuit, and the AC load electric device 5 should have substantially the same power, rated voltage, and operating current. Each group of AC load electric devices 5 connected in series is connected in parallel with the output end of the high frequency chopper circuit 2, and a matched series resonant reactance unit 4 is added. The function of the series resonant reactance unit 4 is to limit current, phase shift, and resonance. . In other words, the impedance matching circuit 3 is composed of a series resonant inductor connected in series with a capacitive load consumer, or a series resonant capacitor connected in series with an inductive load consumer, or a series resonant inductor and a resistive load consumer. Composed in series.

The invention adopts a series resonant circuit 4 which is added and matched to form a series resonant circuit for current limiting, and the frequency of the high frequency chopping output is up to several tens of thousands to hundreds of thousands of cycles because of the high frequency switching power supply. The reactive current can be effectively utilized to achieve energy saving. The circuit of the invention has a simple structure and changes the traditional way of using the AC load electric appliance 5. The conventional method of using the AC load electric appliance 5 is to use the AC load electric appliance 5 directly by the commercial power, in order not to affect the power grid to reduce the line loss, Mostly, the power factor is increased as much as possible, and the reactive current is reduced. However, in the case where the voltage of the AC load device 5 is determined, the power of the AC load device 5 depends on the AC load device 5 itself. The current, that is, the greater the current flowing through the AC load device 5 itself, and the greater the power of the AC load device 5, based on this principle, the present invention employs a series resonant reactor unit 4 that is added for matching. The current of the AC load electric device 5 is increased, that is, the current flowing through the AC load electric device 5 is increased without increasing the existing power of the AC load electric device 5.

WD=VD*ID*COS<D.

WD = active power of the AC load appliance;

VD AC load electrical voltage;

10=Electrical current for AC load;

COS<D=electrical line power factor for AC load.

It can be concluded from the formula that when the COS<D is lowered from 0.8 to 0.5, the ID can be increased by 0.3, SP, and the reactive current is increased by 0.3 when the WD and VD are unchanged. In case of 0.3, 30% can be increased. Another function of the series resonant reactance unit 4 is to change the phase between the current flowing through the AC load device 5 and the output voltage of the high frequency chopper circuit 2, so that the phase difference can be minimized, that is, the power factor is as large as possible. Large, the current phase of the AC load electric device 5 flowing through the parallel branches is different, and the output current of the high frequency chopper circuit 2 is reduced. When the power factor is equal to 0.98, the power loss will follow. As the power factor is increased, the current of the mains input high-frequency switching power supply is also reduced, and the current flowing through the AC load 5 in each of the parallel branches is constant, thereby achieving energy saving.

Further, each set of the impedance matching circuit 3 connected in parallel in the output end of the high frequency chopper circuit 2 is composed of a series resonant reactor unit 4 and an AC load electric device 5 which are matched to form a series resonant circuit having different resonance frequencies, each group The resonant frequency of the series resonant circuit connected in parallel to become an integral load is the same as the frequency of the high frequency chopper circuit 2, and the output current of the commercial power will be reduced in the same time, and as a result, the electrical device for ensuring AC load is ensured. When the current is constant, the output currents of the switching power supply circuit 1 and the high frequency chopper circuit 2 are lowered, thereby achieving the purpose of energy saving.

The invention utilizes a switching power supply circuit 1, a high frequency chopper circuit 2 and other circuits to form a high frequency switching power supply. The switching frequency is 40KC to 120KC, and the best choice is 80KC, which supplies power to the AC load charger 5.

The mains power supply is connected to the input end of the switching power supply circuit 1, and the positive and negative ends of the output of the switching power supply circuit 1 are respectively connected to the power output end of the high frequency chopper circuit 2, and the power output end of the high frequency chopper circuit 2 and all The input terminals of the impedance matching circuit 3 are connected in parallel, and the series-resonant reactance unit 4 to which the impedance matching is added is connected in series with the corresponding AC load electric device 5, and each group of AC load electric appliances 5 may be connected in series from 1 to 4 The series resonant reactor unit 4 incorporating impedance matching is connected in series with the output terminal of the high frequency chopper circuit 2, and all loads of the high frequency chopper circuit 2, gp, impedance matching circuit 3, SP, series resonant reactance unit 4 The connected AC load electrical appliances 5 are connected in parallel with the output end of the high frequency chopper circuit 2, and each series resonant reactance unit 4 is connected to a set of AC load powers connected in series with each other. The number of the AC load devices 5 connected in series is 1 to 4.

The series resonant reactance unit 4 and the AC load electric device 5 form a series resonant circuit, each of which has a resonant frequency different from each other, and each series resonant circuit is connected in parallel to form an integrated load resonant frequency and a high frequency chopper circuit 2 The working frequency is the same.

The method for determining the overall operating frequency of the high frequency chopper circuit 2 and the impedance matching circuit 3 includes the following steps: determining the operating frequency of the high frequency chopper circuit 2; adjusting each of the operating frequencies of the high frequency chopper circuit 2 The impedance matching circuit 3 is added to the value of the matched series resonant reactance unit 4, or the value of the circuit load reactance is adjusted; when each AC load device 5 is in normal operation, the value of the AC input current is monitored, and each value is adjusted. The impedance matching circuit 3 is added to the value of the matched series resonant reactance unit 4, and when the value of the AC input current is measured to be the smallest, the operating frequency of the high frequency chopper circuit 2 is the same as the overall operating frequency of the impedance matching circuit 3.

Another method for determining the overall operating frequency of the high frequency chopper circuit 2 and the impedance matching circuit 3 includes the following steps: determining, by calculation of the load reactance, the value of each of the impedance matching circuits 3 added to the matched series resonant reactance unit 4 Adjusting the operating frequency of the high frequency chopper circuit 2 according to the determined value of each of the matched impedance matching circuits 3, and adjusting the operating frequency of the high frequency chopper circuit 2; when each AC load device 5 is in normal operation, monitoring the AC The operating current frequency of the high frequency chopper circuit 2 is adjusted by the value of the input current. When the value of the AC input current is measured to be the smallest, the operating frequency of the high frequency chopper circuit 2 is the same as the overall operating frequency of the impedance matching circuit 3.

Several examples of the operating frequency of the high frequency chopper circuit 2 matched with the consumer: Figure 3 is the impedance of the series resonant inductor and the capacitive load AC device of the present invention. Matching circuit diagram; As shown in Fig. 3, when the AC load device 5 (capacitive load) is determined, the matched series resonant current limiting inductor is added to adjust the operating frequency of the high frequency chopper circuit 2 to match. When the rechargeable battery (capacitive load) is determined, the matched series resonant current limiting inductor is added, and the operating frequency of the high frequency chopper circuit 2 is adjusted to match.

4 is a schematic diagram of an impedance matching circuit composed of a series resonant capacitor and an inductive load AC device according to the present invention; as shown in FIG. 4, when a hair dryer (inductive load) is determined, a matching series resonant capacitor is added to adjust the high frequency 斩The operating frequency of the wave circuit 2 is matched. When the electric shaver (inductive load) is determined, the matched series resonant capacitor is added, and the operating frequency of the high frequency chopper circuit 2 is adjusted to match.

5 is a schematic diagram of an impedance matching circuit composed of a series resonant inductor and a resistive load AC electrical device according to the present invention; as shown in FIG. 5, in the case where an incandescent lamp (resistive load) is determined, the operating frequency of the high frequency chopper circuit 2 is adjusted. Add a matched series resonant capacitor to the loop to change the original resistive load to an inductive load. When the heater (resistive load) is determined, adjust the operating frequency of the high-frequency chopper circuit 2, and add a matching series resonant inductor to the circuit to change the original resistive load into a capacitive load to match.

6 is a schematic diagram of an impedance matching circuit composed of a series of resonant reactor units of the present invention and a plurality of sets of different types of load AC electrical appliances; as shown in FIG. 6, the series resonant reactance unit 4 uses a series resonant inductor and an inductive load electrical device, and a capacitive load. Impedance matching circuit composed of electrical appliances and resistive load electrical appliances, BP, series resonant circuit; inductive load electrical appliances using electric fans, capacitive load electrical appliances using rechargeable batteries, resistive load electrical appliances With the electric iron, the rated voltage and rated power of the selected load electric appliance are substantially the same. When the above load is determined, the operating frequency of the high frequency chopper circuit 2 is adjusted to match.

In the above embodiments, when the operating frequency of the high frequency chopper circuit 2 is determined, the value of the series resonant reactor unit 4 to be matched or the power of the AC load power unit 5 can be adjusted, and the power can be effectively utilized. The purpose of reactive current is to save energy.

It should be noted that the scope of protection of the present invention is not limited to the specific example manner described above. FIG. 7 is a schematic diagram of a total impedance matching circuit in parallel with an impedance matching circuit composed of a plurality of sets of different types of load AC electrical appliances. As shown in FIG. 7, the AC load device 5 may be a series connection of a capacitive load, an inductive load, and a resistive load, and the equivalent impedance may be capacitive, inductive, and resistive, and is added in the circuit. The matched series resonant reactance can make the impedance matching circuit form a series resonant circuit; according to the basic technical idea of the present invention, embodiments that can be conceived by those skilled in the art without creative labor are all protected by the present invention. range.

Claims

Claim

A power saving device for an alternating current appliance, comprising: a switching power supply circuit (1) and a high frequency chopper circuit (2), further comprising: an impedance matching circuit, wherein the commercial power source is input to the switching power supply circuit, An output of the switching power supply circuit (1) is supplied to the high frequency chopper circuit (2), and an output of the high frequency chopper circuit (2) is electrically connected to an impedance matching circuit (3), and the high frequency chopping The circuit (2) supplies an electric power source for the impedance matching circuit connected in parallel to the high frequency chopper circuit.

The power saving device for an alternating current appliance according to claim 1, wherein the high frequency chopper circuit has an operating frequency range of 40 to 120 kC.

The power saving device for an alternating current appliance according to claim 2, wherein the high frequency chopper circuit has an optimum operating frequency of 80 kC.

The power saving device for an AC electric appliance according to claim 1, wherein the impedance matching circuit is composed of a series resonant reactance unit and a load electric device in series.

The power saving device for an alternating current appliance according to claim 4, wherein the load electric appliance group in the impedance matching circuit is composed of 1 to 4 electric appliances having the same rated voltage.

6 . The method of manufacturing a power saving device for an alternating current appliance according to claim 1 , wherein the impedance matching circuit is added to the matched series resonant reactance to form a series resonant circuit with the load electrical device, and each impedance is The resonant frequencies of the matching circuits are different, and the resonant frequency of each series resonant circuit connected in parallel to become an integral load is the same as the operating frequency of the high frequency chopper circuit.

The method of manufacturing a power saving device for an AC electrical appliance according to claim 6, wherein The method is characterized in that: determining the overall operating frequency of the high frequency chopper circuit and the impedance matching circuit comprises the following steps:

(1) determining an operating frequency of the high frequency chopper circuit;

The method of manufacturing a power saving device for an alternating current appliance according to claim 6, wherein the determining of an overall operating frequency of the high frequency chopper circuit and the impedance matching circuit includes the following steps:

(3) when the load electric appliance is in normal working condition, monitoring the value of the AC input current, adjusting the operating frequency of the high frequency chopper circuit, when the value of the measured AC input current is the smallest, The operating frequency of the high frequency chopper circuit is the same as the overall operating frequency of the impedance matching circuit.