TW200400685A - Switching power supply system with power loss detection - Google Patents

Abstract

The object of the present invention is to provide a high-quality and high-efficiency AC power device. The present invention provides a high-quality and high-efficiency AC power device. The AC power device includes a switching inverter for generating the standard signal control of AC voltage, and a power amplifier. The AC voltage outputted from the switching inverter of the AC voltage generating mechanism is overlapped with a DC compensating voltage. This overlapped DC compensating voltage is used as a power amplifier to execute power driving for the output to the load. At the same time, the power loss amount output signal of the power amplifying section of this power amplifier is used as a negative feedback control signal for output to the switching inverter, and the sum of this signal and the standard signal for generating AC voltage is used to control the switching inverter.

Description

V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to an alternating current having less distortion from a π-shape at each insertion check. "": Both can provide voltage waves [prior art].冋 °°, South-efficiency AC power supply device. Above, id Ξ Γ ΐ i Design and development of AC and DC conversion devices, such as current load; Πί: AC power supply device, which can be used under resistance load and high-quality parts. Devices that provide less voltage waveform distortion and productivity under various load conditions include AC power with less distortion and power J. The switching inverter is a π-meter inverter wire type amplifier. The method and the components make the internal h G: two sets of 'electricity control * type using transistors and other types, although it has the characteristics of the output power plant, because the electric power in the AC power device = force, but the efficiency is lower. Disadvantages: The phase loss of the electric knife is large, and the power conversion efficiency is reduced when there is power conversion. As a result, the device must have a power source that can obtain the maximum power, instantaneous output voltage and current voltage. The power loss will cause a lot of low power. Rate load connection :: imr and 'even if the phase difference of the reactive load battery will become larger. Electricity 2: because the output current and output and the power loss of the control element of the electric house will be greater than 5. Description of the invention (2) Connected to a resistor The electric power at the time of load refers to the current generation. The electric power is lost, so the output power must be greatly reduced. For the people who are familiar with this power amplifier, there is a corresponding setting. In addition, the output voltage of melon can be repeatedly valued by the minimum DC power supply; the method can be directly changed to the necessary voltage waveform to change the internal DC power supply voltage value f ^ according to the parent current output method; the method of conversion efficiency, etc. However, regardless of the use; Change; use the sound required by the parent current power supply device, a variety of methods, the voltage measured in AC, AC "loss: special: it is difficult to maintain high quality and no rate MOS-FET or force ^ AC AC voltage Mode, the power output of the injury H ^ & Straight L is converted into a low-frequency target AC output: the voltage factor 关 = off action pulse width to obtain the moment of the line switching action. The flattening circuit formed by the open capacitor will power the wheel. Compression deformation or continuous wave = = output voltage, so it is suppressed and has a non-linear negative: ㊁: Generates a rush: When the current changes, the wheel output = AC output, it is difficult, because & = machine output voltage will produce a large The voltage waveform is distorted. Value, will affect the characteristics of the inductors and capacitors of the switching circuit, the reverse of the equation, the transient response characteristics of the circuit, and the control system's 200400685. V. Description of the invention (3) The stability conditions will have a great influence. The load impedance and the load terminal are also two: the various types of current output terminals. When the negative t condition is exchanged: = 1, the parallel connection of 影 11 will affect the electrical characteristics of the control of the switching inverter, resulting in the circuit characteristics. Wide amplitude sound month 4 = The feedback frequency band is reduced to extremely low, and the feedback characteristics are deteriorated, and even the second IA position and the nine margin will be reduced, etc., making the transient response electric. In order to generate large deformation of the electric wave, the frequency is increased to ㈣, and expanded; control :::: == the switch of the device is fully negative feedback, and the band of branitis must be ensured,]: = Influence ', but it must be far below the switching action: Λ 羊 本本 特 平平 8-1682R7 of the car's Nyquist frequency (… 1—) riding eight w AC mine, original station 4 i / v ~ A report in 'to improve the switching action too 4

The frequency response characteristic of the circuit part is 1. The instantaneous response frequency at the time of low A motion composed of 1, --turns and electric valleys. 4 The heart σ changes to the load. V t Beifeng can also obtain silver even when the load is violent. "The high-quality output of the support, however, is regarded as a switch; two iLt: up or down, in general, two pieces of electricity can be applied to make the passer speed faster and lower, so a number of exchange Xiang Qin Lei 踗> Two 'must implement a high-priced circuit with hard numbers running in parallel, # 果 ， 有 [Contents of the invention] The technical problem that this electric appliance wants to solve

200400685 V. Description of the invention (4) As mentioned above, using power to obtain high-quality output voltage, but = H-current power supply devices can use the disadvantages of the switch-type reverse efficiency reduction, good power. Conversion efficiency, but there are rounds = = although there is a problem of good disturbance. The present invention is to provide a father-type power supply device that is cheap, high-quality, high, and uses two hands to coordinate the door by making use of the two-shaped shape and ripple operation. The technical means for solving the problems of the present invention In order to achieve the foregoing object, the present invention applies the signal voltage of the reference student 12 to the exchange therapy; 5 & Application, the institutions in the scope of patents i and 2 regard the AC voltage formed by the method of Lu Li 8 and Θ as the AC output of the switching inverter 4 as a power source of the power amplifier 10 :: J :: 此In the middle, the load driven by the switching inverter 4 is considered Λ, this hair month straight pull brace cut off 1 < Bei Zhan said the field success rate amplifier 1 0, 2 voltage will not occur in the switching inverter 4 The problem of waveform variation is ^, and the use of a power circuit composed of a plurality of amplifiers to pursue a substantial reduction in ripple interference, so the exchange ^ = frequency can be lower than the AC power of a general exchange inverter :. ;: Use it as another control of the switching inverter 4; setting this machine # ′ can realize an AC power supply device that is more powerful and more efficient than traditional devices. Page 8 200400685 V. Description of the invention (5) The present invention compares the effect of the prior art, and the effect of the invention is to use the switching inverter method and power amplification. In addition to creating the new effects described below, it can also ensure the two The advantages of the other and make up for the shortcomings of the two. 'Because of the structure of the AC output power of the switching inverter, the negative power of the switching inverter is used to direct the work! The current-specific power amplifier is directly negative. Resistance—that is, resistance near no load. By using the inverter of this device, 'r' can be prevented from being deteriorated due to being hardly affected by the connection type, such as switching type. Also, the effect of various load resistances caused by the power supply's other 'removed ripple voltage with the exchange inverter can also be filtered using the power of the filter. (P_r SuPply Reject) The power supply voltage rejection ratio is the same as the signal / noise ratio, deformation rate, and field resistance, and the resistance of the power amplifier is ^ L, and the resistance is low. The second person's six voltages because of the reverse type can be used without sacrificing. The second device of this device: 5 sub-movers with large output ripple electric exchange inverter 4 = output voltage 'reducing the use of high-power IGBTs and couplers i' In terms of "can be," it can be dealt with in the case of more economical AC power. [Embodiment] The following is a description of the application type of this month with reference to the drawings. The first picture is $ 9,200400685 Explanation (6) The schematic block diagram of the first embodiment of the patent application scope of the invention. The switching inverter 4 is an inverter circuit that converts DC voltage to AC voltage using a conventionally well-known circuit. Supply to power input terminals 2, 3 The DC voltage will be used as the basis for generating a sine wave voltage. If the output signal 12 and the output signal of the power loss detector 14 are used, the output voltage waveform will output a large power / claw proportional to the input signal to the output terminal. 5, 6 The auxiliary power source 7 is composed of a unit that generates 6 of positive voltage + Vdc and negative t voltage-Vdc, and is connected in series with the parent output voltage Vac of output terminals 5 and 6 of the switching inverter 4. The voltage of Vac + (+ Vdc) and the DC auxiliary power supply 7 are at φ * Shanong .. m output to

VaC + (-VdC) ^ The voltage is combined with Λ 'and the output terminal of the DC auxiliary power supply is 8 9 and the output of six ^ θ is output to the output terminal of the DC auxiliary power supply. "^ Power output # 1 Argon power amplifier 10 series The aforementioned DC auxiliary voltage ==== is used as the power source, the reference signal generates a fixed voltage and the amplification factor 2 controls the input terminal, and the power is outputted to the power with a negative connection of-connected to the output terminal 16, ^ The loss detector 1 4 can detect Lei Liu enrollment M + A, and the force loss is generated by the power thunder circuit ㈣Λ :: The circuit of the power loss' Li Shudian, and the front. = T Ϊ 体 body and power M0S ~ FET and other electric control elements are used in the power amplifier ^ Ϊ transistor and power M0S_FET voltage control element and other circuits in the power amplifier stage. An example of the implementation of the circuit y = profit = an example of the switching inverter 4 surrounding the first item. Figures 2a to 3 are for explaining the switching inverter 4 200400685 V. Description of the invention (7) Examples of simulated waveforms for each part. 》 In order to make the description clear, the equivalent circuit of the DC power supply i shown in Figure ^ uses the battery ν, “,” and “& the positive polarity of the auxiliary power supply 7 to compensate the additional voltage. The power supply is represented by -V dc, and the reference signal generator ii: supplementary voltage 12 is used to illustrate its implementation. The power output DC power supply VI will be supplied to the power switching elements χι, X2, χ3, and χ4. Full-bridge circuit composed of IGBT. Use pWM control circuit 4α to generate gate control signals G1, G2, G3, G4 to control the IGBT full-bridge circuit. IGBT power switching elements (χι) located diagonally in the bridge circuit And 乂 4, Μ, and X3 \ are a group. When the complementary on and off are repeatedly performed, a rectangular wave with a voltage amplitude of soil v 1 (V1 is the voltage v D of the DC power supply 1 is generated because of the inductor The integral effect of the flattening circuit composed of LI, L2, and capacitor ^ = will smooth the current of this rectangular wave, and the output voltage will change according to the ratio of the positive and negative components of the rectangular wave. The axis of the three d graphs is the time axis, with 0 ~ 2 2 'paragraph 1 The waveform is the waveform of the reference signal generator V2. Take the sine waveform of vibration / amplitude: 10V, 500Ηζ as an example. The second segment is a reference triangular wave voltage with a frequency of 20KHz, which is repeated as an amplitude of ± 10V as a PWM carrier signal ring. The 3 segments are square waves that compensate the gate signals of the IGBT bridge circuit mutually. The vertical waveform is ± 500V, and the central waveform among the 3 waveforms is a pair of commutator output terminals 6 (common terminals). For example of output terminal 5 (output terminal) voltage f ± 400V, the upper and lower waveforms are the voltage waveforms of inputs 7 and 8 of the DC auxiliary f source when the positive voltage + and negative voltage -Vdc of the DC auxiliary power supply are 50V, respectively.

200400685 V. Description of the invention (8) The signal multiplied by the output voltage of the output terminals 5, 6 (0.025 in this example) and the reference signal generator will be compared and compared. For comparison, use this output voltage as the IGBT gate signal in Figures 3 and 3 to form a negative feedback control loop. In the example of the output of the switching inverter 4 of the voltage V2 of the signal generator, 'With respect to the reference signal voltage ± 10 (the switching action wheel power V is ± 40 0V). In order to make this negative feedback circuit characteristic stable and plastic, this circuit contains an amplitude and phase compensation circuit. Because of the Ί circuit, its description is omitted. t ,,,, and $ In the foregoing description, a full-bridge parent-fed inverter with a fixed reference frequency of three voltages is used as an example, and a half-bridge switching inverter or other The method of implementing gate control to obtain the same inverse voltage is also described by using IGB as an electric control element as an example. However, the use of power MOS-FET has an impact on the essence of the invention. The fourth figure is a schematic block diagram of an embodiment of the second item of the patent application scope of the present invention. The parent commutator inverter 4 is a inverter circuit that converts DC voltage to AC voltage with a conventionally well-known circuit. DC power supply 1 will supply DC voltage to sons 2 and 3, which will generate reference signals such as sine wave voltage. 11 output signal 1 2 and power loss detector 丨 4 output signal 丨 3 = as input signal, superimpose the DC compensation voltage on the output voltage waveform proportional to this input signal, and use the output terminal 6 as a common Line 200400685 V. Description of the invention (9) The father current voltage is output to the output terminals 8,9.浐 生 ί ί Loss Detector 14 is a circuit that detects power loss. The aforementioned power, loss = power transistor and power M0S_FET and other voltage control elements. Ί11 田 power transistor and power M0S-FET and other voltage control elements are used. A power amplifier stage in the internal circuit of the power amplifier 10.浐 雷 ϊ ί, is the real-life of the exchangeable inverter 4 of the patent application No. 2-two columns A, 6th to 6th d are used to illustrate the simulation of the moving part of the exchangeable inverter 4 Waveform example. In order to make the description more concise, the equivalent circuit of the direct current power source i shown in the figure is controlled by the batteries V3, V4, and pwM, and the additional power of the positive polarity compensation of 4A-1 is V5, controlled by V6, and the reference signal is generated The output of the electronic device 11 is represented by the bluff of V2, and the implementation of the operation is explained. ^ 'ΓυΙ source equivalent circuits V3, V4 will be supplied to a half-bridge circuit composed of the IGBT of the power switching element X8. 〖〇βτ 半桥 ί = ί According to the closed-loop control of G5 and G6 generated by the PWM control circuit 4A]: Capacitor C2 is flattened.

Say 4 * 1 and then superimpose PM control circuit 4H: voltage 'on Vac and output it to output terminal 8 of DC auxiliary power. 3 Ϊ ^ And according to the gate control level of G7 and G8 generated by the PWM control circuit 4A_2, then superimpose it on Vac to just control the path 9. Voltage and output to the output terminal of the DC auxiliary power supply. In this mode, the PWM inverter will be controlled by the PWM control circuit 4A-1 and PWM control.

200400685 V. Description of the Invention (ίο) The control circuit 4 A-2 becomes different control loops and operates simultaneously. At this time, the triangle wave voltage for PWM phase comparison usually operates synchronously in shape. In addition, in order to optimize the PWM output voltage, the two systems can also be used to drive the core wave voltage in the opposite phase. The dagger uses the two horns and the sixth wave in the sixth a to six d! From paragraph 3 to paragraph 3, the explanation is the same, but it is one of the waveforms of the PWM control circuit. The face of the four figures is to control the waveform of +4 00v on the output terminal 8 and the DC compensation voltage. Production of wheel-out terminal 9

The voltage waveform when the voltage is maintained. Straight ML describes it ^ 'Through the m-th fine circuit diagram, the above-mentioned commutative reverse overall action, a positive voltage power supply represented by V5, a _Vdc table_ = j + VdC represents a DC auxiliary power supply, and a reference signal production is represented by V6 ^ DC auxiliary power supply negative power source, bit) to explain the benefits. This H output is regarded as the reference potential (ground power XI, X2 and transistor = large =, for example, it is composed of a differential amplifier X3. If it is A f power amplifier and error amplifying surface, compared to when providing a large J amplifier, the power voltage squarer outputs the power source V5 for the power supply ί ί ΐ the shape of the AC power supply exchange reversed + Vdc and -Vdc. Positive and negative DC auxiliary power supply

… The voltage at the output terminals 16 and 17 of the power amplifier is ± 400 V. Page 14 200400685 V. Description of the invention (11) The day guard uses a DC auxiliary power source + Vdc below 50V and ingenuity. In terms of voltage, the power supply terminals 8 and 9 operate under the voltage of the sum of the two auxiliary power supply Vdc-that is, below 100 ν, and output ± 400V to 16, 17 with a wide voltage operating range. 1 This power amplifier will form resistors R9 and R1 〇 as feedback Lei Yangxi negative feedback, the amplifier 'for example ... to achieve 40 times the electric power magnification rate / / 40 different resistance ratio R10 / R9. The error amplifier χ3 passes the X! Differential amplifier, however, because == the heavy one is similar to the switching inverter V5 voltage of the output terminal 16 (400V, etc.), and in order to make the differential feedback amplifier χι voltage (The soil is held in the normal operating range Θ, and the magnification must be far, less than: the attenuation of ^ dimensional 40 volts M m ^ ^ A ± In addition, when the voltage below 16 is the maximum ± 400V, the person who chooses to hold it must use Its voltage amplification is about 0, 1. This method has; the potential of the dagger is moved to the differential amplifier X1 overlapping the output potential on the switching inverter.

The π-amp 5 amplifier is a power amplifier with the purpose of compensating for the signal attenuation of the previous X1 stage. It is also necessary to ensure the necessary maximum output power P of the final stage power amplifier.

Swinging amplifier. Here, in order to get A & I to get a high Communist Party; issue :::: with a large rate of two electricity: Bilai ... Toru, and to complement the two to consider the differential equilibrium of a wide band. Utilize ... Ripple voltage and spikes contained in the AC voltage output V 5 of the parent commutator inverter. 400400685 V. Description of the invention (12) ___ Disturbances will be affected by the differential amplifier X1. Considered as common voltage and attenuated sufficiently. In order to form the negative feedback benefit of the input reference signal generator, to ensure in a wide frequency band: the negative of μ, amplifying the exchange type reverse that is caused by external interference; and the exchange type reverse that can further suppress the traditional way Commutator; = = pressure. It is said that the present invention has negative countermeasures such as frequency. In contrast, the ripple voltage can also be 1: 2 ’even if it is close to the DC auxiliary power supply. Its slope ::: is an equivalent filter that can be actively removed. Perform i Ming. Another feature that will be explained—the effect on the load resistance. The resistance, the negative reflection ratio parameter of the output house that contains the output, and the negative reflection ratio parameter make it become]. It shows that the input of the common wedge amplifier XI is used to distinguish the level ii. Other than voltage, it will not affect the differential 16. ^^ will not be carried on the output terminal of the power amplifier, but represents it; AC power is also a load with a fixed current and a negative load terminal 16 is connected to a large electric power == the power amplifier current load is almost flat The negative of the parent commutator inverter at the intersection of the inverters; 2J technical connection to connect the load to the switcher, Ben 2: Degradation of characteristics' can also be avoided. Power supply VI and V2 = = ί Dynamic amplification 11X1 power supply will be DC auxiliary enclosure and amplification ratio, two; ^ contending, but 'if you consider the input differential voltage standard amplifier, in addition to ^ you can operate with a lower power supply The general implementation of the phase number amplifier χι ~ χ3 phase inversion of the number of amplifiers) composition "two salt Α ...; ν 'intersection of the input and output polarities (in-phase or re-form, can obtain the same effect Page 16 200400685 V. Description of the invention (13) In addition, in order to illustrate the convenience, the power amplifier shown in the seventh figure adopts the performance of early purification, and uses the power of the general PNP type transistor in the conventionally well-known manner. Power amplifiers such as Darlington (㈤in and type Darlington connection, N-channel and p-channel power amplifiers) can also achieve the same operation. Secondly, the power will be described in detail using the examples in Figures 8 and 9 Detector: In the seventh figure, (^ Cong represents a pair of transistors, the aforementioned pair of 3 systems describes the cook in the power amplifier shown in the seventh figure. The pair T in the crystal: the body. A seeking Therefore, V1 represents the output of the switching inverter, + Vdc represents the positive voltage source of the DC auxiliary power source, and _ voltage! Source. The output signals to the switching inverter and the power amplifier ί generator, and Output the electric power with the voltage amplified by the same voltage amplification rate respectively. Connect the load to the output terminal E of the power amplifier (β in the ninth figure), and the load current is determined by the size and nature of the load. The outgoing load over-transistor Q1 'And the incoming load current will flow through ⑽. The moment the electric current flows through the motor, the instantaneous power applied to the product of the current and the voltage between the collector and emitter will become a power loss. Will exceed the absolute maximum allowable power of the transistor. The operational amplifier ^ is a differential amplifier for the purpose of detecting the voltage between the collector and the emitter of the transistor Q1. Similarly, X2 is used to detect the collector and emitter of Q2. For differential amplifiers with voltage as the purpose, the current detected by the shunt resistor R1 and the differential amplifier χ3 is detected by the same, and the current of Q2 is also detected by R2 and X4. Page 17 200400685 V. Description of the invention (14) use When multiplying numbers, output and electricity, you can use the amplifier's amplification system transistors Q1 and Q2 R20 and R22 to determine the input signal factor output of the instantaneous power Is X 7 determined as the power loss Q2. Diode X5 or X6 input XI crystal Q1 or Q 2 instantaneous voltage detection of differential amplifier number and shunt resistance value, power loss. Consider the corresponding voltage of transistor Q1 and Q2 set voltage V4 or V5, diode D1 Or D2. When the operational amplifier X7 transistor Q1 or Q2 and X3, the power amplifier and the multiplication and division of the piezoelectric allow the use of this signal which will circulate another constant or the output signal ratio of X2 and X4 . This current detection uses the differential amplifier's output voltage to convert into a voltage setting method of resistance R19, R21 or power loss. When it exceeds Q1 or ', it becomes the average power of the operational amplification according to the integration factor and ratio, and is subjected to the addition signal by the input signal. The amplitude of the electrical multiple return margin of a certain distance between the exchange poles is supplemented by a large load. Even if the load is large, when the reverse voltage is absolute, the voltage control circuit is executed and the system is compensated. When the power is reduced, the output voltage of the transistor Q1 or Q2 will be negative due to the power loss. In order to make the above-mentioned exchange type reverse feedback, it has a special transient response to make it have the maximum current loss of this crystal Q1 and Q2. However, it also has the advantage of reducing the electrical feedback loop The transmission of the device has the best comprehensiveness, but the power loss will occur. The power loss will occur. The power loss can be used. The collector sun body Q1 or Q2 can be avoided. Of the control loop. Especially the low and large voltage, so the loss of the control loop, the voltage between the emitters, and the emitter loss exceeds the phase stability of the system's stable path other than the signal generation path. However, the power factor often has an effect, and it must be suppressed.

V. Description of the invention (15) Excellent effect with minimum required It is an example of current detection. The negative differential load for detection is the same, which will correspond to the current direction, and will be separated from the phases D3 and D4 shown in the calculation == five circles to R1 2 or 3 = X, 3 respectively. This gives the shunt voltage through the diode flow. Talk to you and get the detected electricity. Other actions are the same as the previous actions. Various methods: conventionally known methods such as performing detection from an amplifier can also provide the same effects as the present invention. The heart is to use a multiplier to detect the transistor i: even simple and error-prone converters sometimes do not return organically. Because it does not detect power, it only detects the voltage between the collector and the emitter. It can also have some effect. In addition, the power amplifier circuit. If there is still a margin, 'these detection and feedback inventions can be omitted # i, which describes the implementation form of the present invention, however, 4 4 p 7 is limited to the implementation form described above, and can also be In order to make the superimposed current compensation voltage only one of the positive and negative polarities, i60! Uses a certain DC compensation voltage to be superimposed on the switching inverter to produce 3 π ^ 2 electric power. At the same time, the DC auxiliary power supply produces 4 ash: The circuit structure of the DC compensation 1 voltage that overlaps the polarity of the DC compensation voltage of the AC voltage can also be used. Brief description of the drawings [Simplified description of the drawings] Figure f is a schematic block diagram of the AC power supply device of the present invention in item 1 of the scope of patent application. The second figure is an embodiment of the circuit configuration of the switching inverter unit of the first scope of the patent application. Figures 2a to 3 and 4 are examples of the actual operation waveforms of the circuit configuration of the second figure. The circuit configuration of the switching inverter unit of the present invention is described in item 2 of the patent. Figure 5 is an example of the scope of patent application: 2 Oyama. The circuit configuration of the father's commutator inverter section of Qianwei No. 2 The sixth a to six d are the fifth circuit of Lei Shishi The seventh circuit is the power amplifier circuit configuration: intended: to make a waveform Power loss detector 2 = Circuit configuration implementation 4 Description of the symbols of each component of the diagram: "circuit configuration implementation 4 2 3 4 4Α 4Α ~ ι 4Α-2 5 DC power supply input terminals Power input terminals Switching inverter PWM control Circuit PWM control circuit PWM control circuit output terminal

200400685

Brief description of drawings on page 21 6 Output terminals 7 DC auxiliary power supply 8 ^ 9 Output terminals of DC auxiliary power supply 10 Power amplifier 11 Reference signal generator 12 Output signal 13 Output signal 14 Power loss detector 15 Feedback signal 16 Output terminal 17 Output terminals C1 to C3 Capacitors D1 to D4 Diodes G1 to G8 Gate control signals L1 to L3 Inductors R1 to R4 Resistors R19 to R22 Dividing resistors VI Output voltage of DC power supply V2 Output voltage of reference signal generator V3 DC Power supply equivalent circuit V4 DC power supply equivalent circuit V5 Positive polarity compensation additional power supply V6 Negative polarity compensation additional power supply XI ~ X8 Power switching element 200400685 Schematic description of Q1 ~ Q6 transistor Page 22 111 ·

Claims (1)

200400685 6. Scope of patent application 1 · A device for generating voltage and connecting to the connection is characterized by the use of a series current auxiliary voltage and using the voltage as the output signal input terminal of the power amplifier. 2 · —A kind of voltage connection is used for: The alternating voltage compensating commutator has a special power generation system that is connected to the inverter and the voltage is superimposed with a power loss detection switching power supply system. The reference of the voltage a purpose: It is connected to a control signal input terminal of the AC parent inverter, and is connected to the control signal input terminal of the power amplifier of the load, which is equal to the direct voltage of the AC output voltage generated by the switching inverter. The source generating mechanism will compensate the voltage t < the DC generated by the heavy generating means == the device 'will detect and the exchange type reverse cries is the 2 c control signal power loss detector: output = current voltage generation Use the reference round to “blind the sum” to perform the feedback control rate loss detection of the crossover + deterministic AC voltage as the system, which is a -reversing reverse two one f reference number, connected to the work of the% load; i big; iV tiger input terminal, and Dawei's control signal terminal, which has the ide upwards, has the ability to generate a plurality of AC wheel output DC compensation pressure: "The father of this switching β i voltage will be used Flow compensation voltage sold 200,400,685