CN203813672U - High-frequency-link no-wire parallel inverter - Google Patents
High-frequency-link no-wire parallel inverter Download PDFInfo
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- CN203813672U CN203813672U CN201320739879.2U CN201320739879U CN203813672U CN 203813672 U CN203813672 U CN 203813672U CN 201320739879 U CN201320739879 U CN 201320739879U CN 203813672 U CN203813672 U CN 203813672U
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Abstract
The utility model discloses a high-frequency-link no-wire parallel inverter. After a main circuit completes the rectification, controllable inversion, high-frequency voltage transformation, a cyclic transformation and filtering of an alternating-current power supply, an acquired alternating current is obtained. A control circuit controls the on/off of a power switch device in the main circuit, thereby enabling the main circuit to output an acquired alternating current. The main circuit employs a full-bridge full-wave topological structure, and achieves a high-frequency performance and the soft switching of a power device. The application of high-frequency link technology enables the size and weight of a switching converter to be greatly reduced, thereby eliminating the audio noise of a transformer and an inductor. The soft-switching technology reduces the loss of a switching device in a switching process, enables the conversion efficiency of an inverter to be higher, and samples the voltage and current signals of an output end. After resistor voltage reduction and band-pass filtering, the signals are sent into a DSP core circuit for processing, so as to achieve the quick and synchronous control of an output voltage of a parallel inverter and the active and reactive load-sharing control of the parallel inverter, thereby meeting the requirements of the parallel connection of the inverter, and achieving the no-wire parallel connection.
Description
Technical field
The utility model belongs to electric and electronic technical field, relates in particular to a kind of High Frequency Link wireless parallel inverter.
Background technology
In today of industry and scientific and technical high development, user is more and more higher to the requirement of the quality of power supply, comprise that all original electric energy of civil power may can not meet user's requirement, must could use after treatment, inversion transformation technique just plays an important role in this processing.And provide the power supply of high-quality, high reliability to become an important topic in the fields such as Aero-Space, boats and ships, computer, communication and medical treatment how to various electronic equipments, how to make more stable, reliable, the continual power supply that provides of an electric power system is also an important research topic simultaneously. inverter parallel, as a kind of power supply redundancy means, can make the reliability of power-supply system increase.
Low frequency inverter due to the magnetic cells such as transformer, electromagnetism and electric capacity volume large, make inverter volume, weight and noise large, the loss of switching device in high frequency hard switching process is very large, the power-supply system that wired shunt chopper forms, its current-sharing, synchronously by wire communication, realize, can expand strong, poor reliability.
Utility model content
The utility model provides a kind of High Frequency Link wireless parallel inverter, aim to provide a kind of standard inverter that is applicable to distributed power supply power-supply system, make the extensibility of output power of power supply strong, flexible design, reliability are high, design can standardization, be easy to safeguard.
The purpose of this utility model is to provide a kind of High Frequency Link wireless parallel inverter, and this High Frequency Link wireless parallel inverter comprises:
For AC power being obtained after over commutation to DC power supply, DC power supply obtains high-frequency alternating current after controlled inversion, high-frequency alternating current obtains high voltagehigh frequency alternating current through high frequency transformation, high voltagehigh frequency alternating current obtains low frequency ac through all wave conversions, and low frequency ac obtains the main circuit of required alternating current after filtering afterwards;
Be connected with described main circuit, for controlling the break-make of described main circuit device for power switching, make described main circuit export the control circuit of required alternating current.
Further, described main circuit comprises:
Passive filter, is connected with AC power, for AC power is carried out to filtering processing, and filtered AC power is exported;
Be connected with described passive filter, for receiving the AC power of described passive filter output, AC power carried out to rectification, obtain the go forward side by side full bridge rectifier of line output of DC power supply;
Be connected with described full bridge rectifier, for receiving the DC power supply of described full bridge rectifier output, DC power supply carried out to inversion, obtain the go forward side by side controlled inverter circuit of full-bridge of line output of high-frequency alternating current;
Be connected with the controlled inverter circuit of described full-bridge, for receiving the high-frequency alternating current of the controlled inverter circuit output of described full-bridge, high-frequency alternating current be transformed to high voltagehigh frequency alternating current, and the high frequency transformer that high voltagehigh frequency alternating current is exported;
Be connected with described high frequency transformer, for receiving the high voltagehigh frequency alternating current of described high frequency transformer output, high voltagehigh frequency alternating current be transformed to low frequency ac, and the cycle translation circuit that low frequency ac is exported;
Be connected with described cycle translation circuit, for receiving the low frequency ac of described cycle translation circuit output, low frequency ac carried out to filtering processing, and the LC filter circuit that the low frequency ac after filtering processing is exported.
Further, described passive filter adopts LC filtering;
Described full bridge rectifier is by uncontrollable diode D15, uncontrollable diode D16, uncontrollable diode D17 and uncontrollable diode D18 connect and compose, one output of described passive filter is connected with the negative electrode of uncontrollable diode D15, another output of described passive filter is connected with the negative electrode of uncontrollable diode D17, the negative electrode of uncontrollable diode D15 is connected with the anode of uncontrollable diode D16, the negative electrode of uncontrollable diode D17 is connected with the anode of uncontrollable diode D18, the anode of uncontrollable diode D15 is connected with the anode of uncontrollable diode D17, the negative electrode of uncontrollable diode D16 is connected with the negative electrode of uncontrollable diode D18, the negative electrode of uncontrollable diode D18 is also connected with the positive pole of electrochemical capacitor C, the negative pole of electrochemical capacitor C is connected with the anode of uncontrollable diode D17,
The leading leg of the controlled inverter circuit of described full-bridge is connected and composed by device for power switching S1 and device for power switching S2, the two ends of device for power switching S1 are parallel with diode D1 and capacitor C 1, the two ends of device for power switching S2 are parallel with diode D2 and capacitor C 2, lagging leg is connected and composed by device for power switching S3 and device for power switching S4, the two ends of device for power switching S3 are parallel with diode D3 and capacitor C 3, the two ends of device for power switching S4 are parallel with diode D4 and capacitor C 4, device for power switching S1 is connected with device for power switching S3 by diode D5, device for power switching S2 is connected with device for power switching S4 by diode D6, the output of leading leg is connected with an input of high frequency transformer by capacitor C b, the output of lagging leg is directly connected with another input of high frequency transformer,
Described cycle translation circuit is by device for power switching S5, device for power switching S6, do not control diode D7, do not control diode D8, do not control diode D9, do not control diode D10, do not control diode D11, do not control diode D12, do not control diode D13, not controlling diode D14 connects and composes, described LC filter circuit is by low frequency inductance L f1, low frequency inductance L f2, capacitor C f connects and composes, one output of high frequency transformer is connected with the anode of not controlling diode D7, not controlling the negative electrode of diode D7 is connected with the negative electrode of not controlling diode D11, the anode of not controlling diode D11 is connected with the first end of low frequency inductance L f1, the anode of not controlling diode D7 is also connected with the negative electrode of not controlling diode D8, not controlling the anode of diode D8 is connected with the anode of not controlling diode D12, the negative electrode of not controlling diode D12 is connected with the first end of low frequency inductance L f2, the second end of low frequency inductance L f2 is connected with the second end of low frequency inductance L f1, one output of high frequency transformer is connected with the anode of not controlling diode D10, not controlling the negative electrode of diode D10 is connected with the negative electrode of not controlling diode D14, the anode of not controlling diode D14 is connected with the first end of low frequency inductance L f1, the anode of not controlling diode D10 is also connected with the negative electrode of not controlling diode D9, not controlling the anode of diode D9 is connected with the anode of not controlling diode D13, the negative electrode of not controlling diode D13 is connected with the first end of low frequency inductance L f2, one end of capacitor C f is connected with the second end of low frequency inductance L f1 and low frequency inductance L f2.
Further, described control circuit comprises:
Be used for accessing 220V AC power, output 3.3V, 5V and 15V direct-current power supply are to the auxiliary power circuit of sample circuit, protective circuit, modulate circuit, drive circuit and DSP core circuit;
For receiving the voltage and current signal of described main circuit output, through Hall element and sampling, process the sample circuit of the weak electric signal that obtains being less than 5V;
Be connected with described sample circuit, the voltage and current weak electric signal obtaining for receiving sample circuit sampling, through filtering, level conversion, amplitude limiting processing, obtain being not more than the weak electric signal of 3.3V, export the modulate circuit of the AD conversion mouth of described DSP core circuit to;
Be connected with described sample circuit, the voltage and current weak electric signal obtaining for receiving sample circuit sampling, voltage and current to this High Frequency Link wireless parallel inverter output carries out overcurrent, short circuit, overvoltage, under-voltage protection, final output one switching signal, the PWM that simultaneously sends into DSP core circuit interrupts pin and drive circuit firmly, when fault occurs, for hardware protection to turn-off the protective circuit of the power device of described main circuit;
Be connected with described protective circuit, for receiving the protection switch signal that described protective circuit obtains, forbid output pwm signal, receive the voltage and current signal that described modulate circuit obtains simultaneously, in dsp chip, carry out AD conversion, PQ decomposition, two closed-loop control, voltage modulated processing, the DSP core circuit of final output pwm signal;
Be connected with described DSP core circuit, for the pwm signal of described DSP core circuit output being converted to the drive circuit of the switching signal of controlling described main circuit power device.
The High Frequency Link wireless parallel inverter that the utility model provides, main circuit obtains AC power DC power supply after over commutation, DC power supply obtains high-frequency alternating current after controlled inversion, high-frequency alternating current obtains high voltagehigh frequency alternating current through high frequency transformation, high voltagehigh frequency alternating current obtains low frequency ac through all wave conversions, low frequency ac obtains required alternating current after filtering afterwards, and control circuit is controlled the break-make of device for power switching in main circuit, makes main circuit export required alternating current, main circuit adopts full-bridge full wave type topological structure, realized the soft switch of high frequency and power device, the application of High Frequency Link technology makes the volume of switch converters, weight greatly reduces, eliminated the audio-frequency noise of transformer and inductance, the employing of soft switch technique has reduced the loss of switching device in switching process, make the conversion efficiency of inverter higher, sampling output end voltage, current signal, after resistance step-down and bandpass filtering, send into DSP core circuit and process to realize that the Fast synchronization of shunt chopper output voltage is controlled and the meritorious and reactive load of shunt chopper is divided equally control, thereby arrive inverter parallel requirement, realized wireless parallel, the utility model makes that the extensibility of output power of power supply is strong, flexible design, reliability are high, design can standardization, be easy to safeguard, simple in structure, practical, has stronger propagation and employment and is worth.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the High Frequency Link wireless parallel inverter that provides of the utility model embodiment;
Fig. 2 is the structured flowchart of the control circuit that provides of the utility model embodiment;
The realization flow block diagram of PQ algorithm is provided in the DSP core circuit that provides of the utility model embodiment Fig. 3.
In figure: 11, main circuit; 111, passive filter; 112, full bridge rectifier; 113, the controlled inverter circuit of full-bridge; 114, high frequency transformer; 115, cycle translation circuit; 116, LC filter circuit; 12, control circuit; 121, DSP core circuit; 122, auxiliary power circuit; 123, sample circuit; 124, modulate circuit; 125, drive circuit; 126, protective circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is described in further detail.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction utility model.
Fig. 1 shows the structure of the High Frequency Link wireless parallel inverter that the utility model embodiment provides.For convenience of explanation, only show the part relevant to the utility model.
This High Frequency Link wireless parallel inverter comprises:
For AC power being obtained after over commutation to DC power supply, DC power supply obtains high-frequency alternating current after controlled inversion, high-frequency alternating current obtains high voltagehigh frequency alternating current through high frequency transformation, high voltagehigh frequency alternating current obtains low frequency ac through all wave conversions, and low frequency ac obtains the main circuit 11 of required alternating current after filtering afterwards;
Be connected with main circuit 11, for controlling the break-make of main circuit 11 device for power switching, make the control circuit 12 of the required alternating current of main circuit 11 output.
In the utility model embodiment, main circuit 11 comprises:
Be connected with AC power, for AC power is carried out to filtering processing, and the passive filter 111 that filtered AC power is exported;
Be connected with passive filter 111, for receiving the AC power of passive filter 111 output, AC power carried out to rectification, obtain the go forward side by side full bridge rectifier 112 of line output of DC power supply;
Be connected with full bridge rectifier 112, for receiving the DC power supply of full bridge rectifier 112 output, DC power supply carried out to inversion, obtain the go forward side by side controlled inverter circuit 113 of full-bridge of line output of high-frequency alternating current;
Be connected with the controlled inverter circuit 113 of full-bridge, for receiving the high-frequency alternating current of controlled inverter circuit 113 outputs of full-bridge, high-frequency alternating current be transformed to high voltagehigh frequency alternating current, and the high frequency transformer 114 that high voltagehigh frequency alternating current is exported;
Be connected with high frequency transformer 114, for receiving the high voltagehigh frequency alternating current of high frequency transformer 114 outputs, high voltagehigh frequency alternating current be transformed to low frequency ac, and the cycle translation circuit 115 that low frequency ac is exported;
Be connected with cycle translation circuit 115, for receiving the low frequency ac of cycle translation circuit 115 outputs, low frequency ac carried out to filtering processing, and the LC filter circuit 116 that the low frequency ac after filtering processing is exported.
In the utility model embodiment, passive filter 111 adopts LC filtering;
Full bridge rectifier 112 is by uncontrollable diode D15, uncontrollable diode D16, uncontrollable diode D17 and uncontrollable diode D18 connect and compose, one output of passive filter 111 is connected with the negative electrode of uncontrollable diode D15, another output of passive filter 111 is connected with the negative electrode of uncontrollable diode D17, the negative electrode of uncontrollable diode D15 is connected with the anode of uncontrollable diode D16, the negative electrode of uncontrollable diode D17 is connected with the anode of uncontrollable diode D18, the anode of uncontrollable diode D15 is connected with the anode of uncontrollable diode D17, the negative electrode of uncontrollable diode D16 is connected with the negative electrode of uncontrollable diode D18, the negative electrode of uncontrollable diode D18 is also connected with the positive pole of electrochemical capacitor C, the negative pole of electrochemical capacitor C is connected with the anode of uncontrollable diode D17,
The leading leg of the controlled inverter circuit 113 of full-bridge is connected and composed by device for power switching S1 and device for power switching S2, the two ends of device for power switching S1 are parallel with diode D1 and capacitor C 1, the two ends of device for power switching S2 are parallel with diode D2 and capacitor C 2, lagging leg is connected and composed by device for power switching S3 and device for power switching S4, the two ends of device for power switching S3 are parallel with diode D3 and capacitor C 3, the two ends of device for power switching S4 are parallel with diode D4 and capacitor C 4, device for power switching S1 is connected with device for power switching S3 by diode D5, device for power switching S2 is connected with device for power switching S4 by diode D6, the output of leading leg is connected with an input of high frequency transformer 114 by capacitor C b, the output of lagging leg is directly connected with another input of high frequency transformer 114,
Cycle translation circuit 115 is by device for power switching S5, device for power switching S6, do not control diode D7, do not control diode D8, do not control diode D9, do not control diode D10, do not control diode D11, do not control diode D12, do not control diode D13, not controlling diode D14 connects and composes, LC filter circuit 116 is by low frequency inductance L f1, low frequency inductance L f2, capacitor C f connects and composes, one output of high frequency transformer 114 is connected with the anode of not controlling diode D7, not controlling the negative electrode of diode D7 is connected with the negative electrode of not controlling diode D11, the anode of not controlling diode D11 is connected with the first end of low frequency inductance L f1, the anode of not controlling diode D7 is also connected with the negative electrode of not controlling diode D8, not controlling the anode of diode D8 is connected with the anode of not controlling diode D12, the negative electrode of not controlling diode D12 is connected with the first end of low frequency inductance L f2, the second end of low frequency inductance L f2 is connected with the second end of low frequency inductance L f1, one output of high frequency transformer 114 is connected with the anode of not controlling diode D10, not controlling the negative electrode of diode D10 is connected with the negative electrode of not controlling diode D14, the anode of not controlling diode D14 is connected with the first end of low frequency inductance L f1, the anode of not controlling diode D10 is also connected with the negative electrode of not controlling diode D9, not controlling the anode of diode D9 is connected with the anode of not controlling diode D13, the negative electrode of not controlling diode D13 is connected with the first end of low frequency inductance L f2, one end of capacitor C f is connected with the second end of low frequency inductance L f1 and low frequency inductance L f2.
In the utility model embodiment, control circuit 12 comprises:
Be used for accessing 220V AC power, output 3.3V, 5V and 15V direct-current power supply are to the auxiliary power circuit 122 of sample circuit 123, protective circuit 126, modulate circuit 124, drive circuit 125 and DSP core circuit 121;
For receiving the voltage and current signal of main circuit 11 output, through Hall element and sampling, process the sample circuit 123 of the weak electric signal that obtains being less than 5V;
Be connected with sample circuit 123, the voltage and current weak electric signal obtaining for receiving sample circuit 123 samplings, through filtering, level conversion, amplitude limiting processing, obtain being not more than the weak electric signal of 3.3V, export the modulate circuit 124 of the AD conversion mouth of DSP core circuit 121 to;
Be connected with sample circuit 123, the voltage and current weak electric signal obtaining for receiving sample circuit 123 samplings, voltage and current to this High Frequency Link wireless parallel inverter output carries out overcurrent, short circuit, overvoltage, under-voltage protection, final output one switching signal, the PWM that simultaneously sends into DSP core circuit 121 interrupts pin and drive circuit 125 firmly, when fault occurs, the protective circuit 126 for hardware protection with the power device of shutoff main circuit 11;
Be connected with protective circuit 126, for receiving the protection switch signal that protective circuit 126 obtains, forbid output pwm signal, the voltage and current signal that receiving conditioning circuit 124 obtains simultaneously, in dsp chip, carry out AD conversion, PQ decomposition, two closed-loop control, voltage modulated processing, the DSP core circuit 121 of final output pwm signal;
Be connected with DSP core circuit 121, for the pwm signal of DSP core circuit 121 outputs being converted to the drive circuit 125 of the switching signal of controlling main circuit 11 power devices.
Below in conjunction with drawings and the specific embodiments, application principle of the present utility model is further described.
The High Frequency Link wireless parallel inverter that the utility model provides, aim to provide a kind of standard inverter that is applicable to distributed power supply power-supply system, make output power of power supply can expansion, high, the design of flexible design, reliability can standardization, be easy to safeguard.
Technical essential one: the full-bridge full wave type topological structure that main circuit 11 of the present utility model adopts as shown in Figure 1, to realize the soft switch of high frequency and power device, application High Frequency Link technology can be so that volume, the weight of switch converters (the particularly magnetic cell such as transformer, electromagnetism and electric capacity) greatly reduce, and can eliminating transformer and the audio-frequency noise of inductance. adopt soft switch technique greatly to reduce the loss of switching device in switching process, buffer circuit is become unnecessary, thereby make the conversion efficiency of inverter higher.
Technical essential two: sampling output end voltage, current signal, after resistance step-down and Butterworth filtering, send into DSP core circuit 121 and process to realize that the Fast synchronization of shunt chopper output voltage is controlled and the meritorious and reactive load of shunt chopper is divided equally control, thereby arrive inverter parallel requirement, realize wireless parallel.
Main circuit 11:
AC power obtains DC power supply after full bridge rectifier 112, after the controlled inverter circuit 113 of full-bridge, obtain the alternating current (HFAC) of high frequency, through high frequency transformer 114, obtain the high-frequency alternating current of high pressure, through cycle translation circuit 115, obtain again the alternating current (LFAC) of low frequency, after LC filter circuit 116, obtain the alternating current needing.
Full bridge rectifier 112 is not controlled diode by four and is formed, and is exchanging input side access passive filter 111;
S3, the device for power switching S4 of controlled inverter circuit 113 lagging legs of full-bridge realize zero-current switching, and shunt capacitance no longer, and the energy that electric capacity discharges when avoiding opening is greater than turn-on consumption; Leading leg utilizes the method for the upper shunt capacitance of device for power switching S1, device for power switching S2 to realize ZVS, thereby has improved the efficiency of whole circuit.
Cycle translation circuit 115 is not controlled diode by two device for power switching and eight and is formed;
LC filter circuit 116 is comprised of inductance L and capacitor C.
Control circuit 12:
Control circuit 12 comprises DSP core circuit 121, auxiliary power circuit 122, sample circuit 123, modulate circuit 124, drive circuit 125, protective circuit 126;
Auxiliary power circuit 122, access 220V AC power, output 3.3V, 5V, 15V direct-current power supply is to sample circuit 123, protective circuit 126, modulate circuit 124, drive circuit 125 and DSP core circuit 121;
Sample circuit 123, the voltage and current signal of access main circuit 11 outputs, processes through Hall element and sampling the weak electric signal that obtains being less than 5V;
Modulate circuit 124, the voltage and current weak electric signal that sampling is obtained, obtains being not more than the weak electric signal of 3.3V through filtering, level conversion, amplitude limit, export the AD conversion mouthful of DSP core circuit 121 to;
Protective circuit 126, voltage, electric current weak electric signal that access sample circuit 123 obtains, voltage and current to this High Frequency Link wireless parallel inverter output carries out overcurrent, short circuit, overvoltage, under-voltage protection, final output one switching signal, the PWM that simultaneously sends into DSP core circuit 121 interrupts pin and drive circuit 125 firmly, when fault occurs, the power device for hardware protection with shutoff main circuit 11;
DSP core circuit 121, the protection switch signal that access protective circuit 126 obtains, forbids output pwm signal; Meanwhile, the voltage and current signal that access modulate circuit 124 obtains carries out the processing such as AD conversion, PQ decomposition, two closed-loop control, voltage modulated in dsp chip, final output pwm signal;
Drive circuit 125, converts pwm signal to main circuit 11 control signals, the i.e. switching signal of power device.
Normal operating conditions: shunt chopper provided by the utility model is sampling and outputting voltage both, the inductive current of sampling again, through modulate circuit 124, obtain being not more than the weak electric signal of 3.3V, export the AD conversion mouthful of DSP core circuit 121 to, in each sampling period, complete once sampling, the voltage and current circuit that sampling obtains is realized improved PQ algorithm in DSP core circuit 121 inside, thereby obtain reference voltage, as shown in Figure 3, by the comparison of sampled voltage and reference voltage, obtain error signal, after controlling, P1 obtains the reference current of electric current, then compare with sample rate current, obtain current error signal, current error signal obtains modulation wave signal after P1 controls, modulation wave signal is compared with triangular carrier amplitude, the PWM that obtains switching tube drives signal, drive the device for power switching of the controlled inverter circuit 113 of full-bridge, output high-frequency pulse voltage, its amplitude is rectification circuit rectification 220V alternating current gained DC voltage value, obtain high-frequency pulse voltage again through high frequency transformer 114 transformations, to meet the required alternating voltage amplitude demand of load, then through cycle translation circuit 115, change the frequency of alternating voltage, to meet the required frequency needs of load, finally by LC filter circuit 116, carry out filtering processing, its output access load, next control cycle is by above-mentioned steps circulation, what control circuit 12 adopted is the two closed-loop controls of voltage, current instantaneous value ring, the object that outer voltage is also set outside current inner loop is different loads to realize the automatic control of reference current amplitude, to realize the current-sharing of each shunt chopper, this control strategy had both guaranteed the stability that output voltage has had, and the system that guarantees again has dynamic response performance faster.
Malfunction: shunt chopper provided by the utility model is sampling and outputting voltage both, the inductive current of sampling again, and be provided with overvoltage, overcurrent, the protective circuits such as short circuit 126, sampling obtains voltage or electric current and protective circuit 126 set points and compares, if exceed range of set value, as overvoltage, overcurrent, short circuit, export a low level to the fault interrupting pin of DSP core circuit 121, it is high configuration that DSP core circuit 121 is put PWM output pin immediately, thereby close the device for power switching of the controlled inverter circuit 113 of full-bridge, cut off the contact of input and load, protection power device and load.
The High Frequency Link wireless parallel inverter that the utility model embodiment provides, main circuit 11 obtains AC power DC power supply after over commutation, DC power supply obtains high-frequency alternating current after controlled inversion, high-frequency alternating current obtains high voltagehigh frequency alternating current through high frequency transformation, high voltagehigh frequency alternating current obtains low frequency ac through all wave conversions, low frequency ac obtains required alternating current after filtering afterwards, control circuit 12 is controlled the break-make of device for power switching in main circuit 11, makes the required alternating current of main circuit 11 output, main circuit 11 adopts full-bridge full wave type topological structure, realized the soft switch of high frequency and power device, the application of High Frequency Link technology makes the volume of switch converters, weight greatly reduces, eliminated the audio-frequency noise of transformer and inductance, the employing of soft switch technique has reduced the loss of switching device in switching process, make the conversion efficiency of inverter higher, sampling output end voltage, current signal, after resistance step-down and bandpass filtering, send into DSP core circuit 121 and process to realize that the Fast synchronization of shunt chopper output voltage is controlled and the meritorious and reactive load of shunt chopper is divided equally control, thereby arrive inverter parallel requirement, realized wireless parallel, the utility model makes that the extensibility of output power of power supply is strong, flexible design, reliability are high, design can standardization, be easy to safeguard, simple in structure, practical, has stronger propagation and employment and is worth.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. a High Frequency Link wireless parallel inverter, is characterized in that, this High Frequency Link wireless parallel inverter comprises:
For AC power being obtained after over commutation to DC power supply, DC power supply obtains high-frequency alternating current after controlled inversion, high-frequency alternating current obtains high voltagehigh frequency alternating current through high frequency transformation, high voltagehigh frequency alternating current obtains low frequency ac through all wave conversions, and low frequency ac obtains the main circuit of required alternating current after filtering afterwards;
Be connected with described main circuit, for controlling the break-make of described main circuit device for power switching, make described main circuit export the control circuit of required alternating current.
2. High Frequency Link wireless parallel inverter as claimed in claim 1, is characterized in that, described main circuit further comprises:
Passive filter, is connected with AC power, for AC power is carried out to filtering processing, and filtered AC power is exported;
Be connected with described passive filter, for receiving the AC power of described passive filter output, AC power carried out to rectification, obtain the go forward side by side full bridge rectifier of line output of DC power supply;
Be connected with described full bridge rectifier, for receiving the DC power supply of described full bridge rectifier output, DC power supply carried out to inversion, obtain the go forward side by side controlled inverter circuit of full-bridge of line output of high-frequency alternating current;
Be connected with the controlled inverter circuit of described full-bridge, for receiving the high-frequency alternating current of the controlled inverter circuit output of described full-bridge, high-frequency alternating current be transformed to high voltagehigh frequency alternating current, and the high frequency transformer that high voltagehigh frequency alternating current is exported;
Be connected with described high frequency transformer, for receiving the high voltagehigh frequency alternating current of described high frequency transformer output, high voltagehigh frequency alternating current be transformed to low frequency ac, and the cycle translation circuit that low frequency ac is exported;
Be connected with described cycle translation circuit, for receiving the low frequency ac of described cycle translation circuit output, low frequency ac carried out to filtering processing, and the LC filter circuit that the low frequency ac after filtering processing is exported.
3. High Frequency Link wireless parallel inverter as claimed in claim 2, is characterized in that, described passive filter adopts LC filtering;
Described full bridge rectifier is by uncontrollable diode D15, uncontrollable diode D16, uncontrollable diode D17 and uncontrollable diode D18 connect and compose, one output of described passive filter is connected with the negative electrode of uncontrollable diode D15, another output of described passive filter is connected with the negative electrode of uncontrollable diode D17, the negative electrode of uncontrollable diode D15 is connected with the anode of uncontrollable diode D16, the negative electrode of uncontrollable diode D17 is connected with the anode of uncontrollable diode D18, the anode of uncontrollable diode D15 is connected with the anode of uncontrollable diode D17, the negative electrode of uncontrollable diode D16 is connected with the negative electrode of uncontrollable diode D18, the negative electrode of uncontrollable diode D18 is also connected with the positive pole of electrochemical capacitor C, the negative pole of electrochemical capacitor C is connected with the anode of uncontrollable diode D17,
The leading leg of the controlled inverter circuit of described full-bridge is connected and composed by device for power switching S1 and device for power switching S2, the two ends of device for power switching S1 are parallel with diode D1 and capacitor C 1, the two ends of device for power switching S2 are parallel with diode D2 and capacitor C 2, lagging leg is connected and composed by device for power switching S3 and device for power switching S4, the two ends of device for power switching S3 are parallel with diode D3 and capacitor C 3, the two ends of device for power switching S4 are parallel with diode D4 and capacitor C 4, device for power switching S1 is connected with device for power switching S3 by diode D5, device for power switching S2 is connected with device for power switching S4 by diode D6, the output of leading leg is connected with an input of high frequency transformer by capacitor C b, the output of lagging leg is directly connected with another input of high frequency transformer,
Described cycle translation circuit is by device for power switching S5, device for power switching S6, do not control diode D7, do not control diode D8, do not control diode D9, do not control diode D10, do not control diode D11, do not control diode D12, do not control diode D13, not controlling diode D14 connects and composes, described LC filter circuit is by low frequency inductance L f1, low frequency inductance L f2, capacitor C f connects and composes, one output of high frequency transformer is connected with the anode of not controlling diode D7, not controlling the negative electrode of diode D7 is connected with the negative electrode of not controlling diode D11, the anode of not controlling diode D11 is connected with the first end of low frequency inductance L f1, the anode of not controlling diode D7 is also connected with the negative electrode of not controlling diode D8, not controlling the anode of diode D8 is connected with the anode of not controlling diode D12, the negative electrode of not controlling diode D12 is connected with the first end of low frequency inductance L f2, the second end of low frequency inductance L f2 is connected with the second end of low frequency inductance L f1, one output of high frequency transformer is connected with the anode of not controlling diode D10, not controlling the negative electrode of diode D10 is connected with the negative electrode of not controlling diode D14, the anode of not controlling diode D14 is connected with the first end of low frequency inductance L f1, the anode of not controlling diode D10 is also connected with the negative electrode of not controlling diode D9, not controlling the anode of diode D9 is connected with the anode of not controlling diode D13, the negative electrode of not controlling diode D13 is connected with the first end of low frequency inductance L f2, one end of capacitor C f is connected with the second end of low frequency inductance L f1 and low frequency inductance L f2.
4. High Frequency Link wireless parallel inverter as claimed in claim 1, is characterized in that, described control circuit further comprises:
Be used for accessing 220V AC power, output 3.3V, 5V and 15V direct-current power supply are to the auxiliary power circuit of sample circuit, protective circuit, modulate circuit, drive circuit and DSP core circuit;
For receiving the voltage and current signal of described main circuit output, through Hall element and sampling, process the sample circuit of the weak electric signal that obtains being less than 5V;
Be connected with described sample circuit, the voltage and current weak electric signal obtaining for receiving sample circuit sampling, through filtering, level conversion, amplitude limiting processing, obtain being not more than the weak electric signal of 3.3V, export the modulate circuit of the AD conversion mouth of described DSP core circuit to;
Be connected with described sample circuit, the voltage and current weak electric signal obtaining for receiving sample circuit sampling, voltage and current to this High Frequency Link wireless parallel inverter output carries out overcurrent, short circuit, overvoltage, under-voltage protection, final output one switching signal, the PWM that simultaneously sends into DSP core circuit interrupts pin and drive circuit firmly, when fault occurs, for hardware protection to turn-off the protective circuit of the power device of described main circuit;
Be connected with described protective circuit, for receiving the protection switch signal that described protective circuit obtains, forbid output pwm signal, receive the voltage and current signal that described modulate circuit obtains simultaneously, in dsp chip, carry out AD conversion, PQ decomposition, two closed-loop control, voltage modulated processing, the DSP core circuit of final output pwm signal;
Be connected with described DSP core circuit, for the pwm signal of described DSP core circuit output being converted to the drive circuit of the switching signal of controlling described main circuit power device.
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| CN201320739879.2U CN203813672U (en) | 2013-11-22 | 2013-11-22 | High-frequency-link no-wire parallel inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647459A (en) * | 2013-11-22 | 2014-03-19 | 肖红军 | High-frequency-link parallel inverter with no connection wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647459A (en) * | 2013-11-22 | 2014-03-19 | 肖红军 | High-frequency-link parallel inverter with no connection wire |
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