CN216216584U - Buck-boost inverter - Google Patents
Buck-boost inverter Download PDFInfo
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- CN216216584U CN216216584U CN202122302940.4U CN202122302940U CN216216584U CN 216216584 U CN216216584 U CN 216216584U CN 202122302940 U CN202122302940 U CN 202122302940U CN 216216584 U CN216216584 U CN 216216584U
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Abstract
The application discloses buck-boost inverter, this buck-boost inverter contain parts such as input power, coupling inductance, filtering unit, first switch, second switch, third switch and fourth switch, and wherein filtering unit comprises filtering inductance, damping resistance and filter capacitance. When the input voltage is greater than the power grid voltage and the power grid voltage is in a positive half cycle, the third switch is normally on, the fourth switch is normally off, and the power grid current is controlled to track the first reference current by adjusting the duty ratio of the first switch; at other moments, the first switch and the third switch are switched on and off at the same time in a high-frequency mode, the second switch and the fourth switch are switched on and off at the same time in a high-frequency mode, and the power grid current is controlled to track the second reference current by adjusting the duty ratio of the first switch; this utility model discloses can realize the conversion of step-up and step-down, eliminate non-isolation photovoltaic inverter's common mode leakage current, adopt the single-stage transform, improve system conversion efficiency.
Description
Technical Field
The application relates to the field of inverters, in particular to a buck-boost inverter.
Background
Since the non-isolated inverter has no isolation between the photovoltaic module and the grid, common mode leakage current may be generated through the parasitic capacitance to ground of the photovoltaic module. This common mode leakage current can cause electromagnetic interference, increase system loss, even pose a threat to personal safety. Experts and scholars at home and abroad develop a series of effective researches on how to inhibit the common-mode leakage current of the non-isolated inverter; the common methods are as follows: improved modulation techniques, increased switching devices, increased filters, and improved control methods, among others. However, the effect of suppressing the common mode leakage current by the above method is easily affected by the parasitic capacitance of the photovoltaic module to the ground and the variation of circuit parameters.
In addition, the output voltage of the photovoltaic module is generally low, the non-isolated inverter is required to realize the function of buck-boost conversion, and the traditional method adopts two-stage conversion to realize buck-boost, namely, a mode of cascading the boost converter and the inverter, so that the system efficiency is reduced.
Therefore, it is necessary to research an inverter topology and a control method thereof that can fundamentally eliminate common mode leakage current and can realize high-efficiency buck-boost conversion.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a step-up and step-down dc-to-ac converter, aims at solving the unable problem that realizes the step-up and step-down transform of traditional dc-to-ac converter, eliminates common mode electric leakage phenomenon, improves photovoltaic inverter system's conversion efficiency.
In order to achieve the purpose, the application is realized by the following technical scheme:
a buck-boost inverter comprising:
the negative pole of the input power supply is connected with the negative pole of the power grid, and the negative pole of the input power supply and the negative pole of the power grid are grounded together;
the filtering unit comprises a filtering inductor, a damping resistor and a filtering capacitor; the first end of the filter inductor is connected with the anode of the power grid, the first end of the damping resistor is respectively connected with the second end of the second switch and the cathode of the power grid, and the second end of the damping resistor is connected with the first end of the filter capacitor;
the coupling inductor comprises a primary winding and a secondary winding; the first end of the primary winding of the coupling inductor is respectively connected with the second end of the filter inductor, the second end of the filter capacitor and the fourth end of the secondary winding of the coupling inductor, the second end of the primary winding of the coupling inductor is respectively connected with the positive electrode of the input power supply through a third switch and a first switch, and the primary winding of the coupling inductor, the power grid, the filter unit, the input power supply, the third switch and the first switch form a first closed loop; the primary winding of the coupling inductor, the power grid, the filtering unit, the third switch and the second switch form a first follow current loop;
the third end of the secondary winding of the coupling inductor is connected with the negative electrode of the power grid through a fourth switch and the second switch respectively, so that the secondary winding of the coupling inductor forms a second follow current loop with the power grid, the filtering unit, the fourth switch and the second switch;
and the input end of the control driving unit is respectively connected with a power grid, an input power supply, the primary winding of the coupling inductor and the secondary winding of the coupling inductor, and the output end of the control driving unit is respectively connected with the first switch, the second switch, the third switch and the fourth switch and is used for respectively driving and controlling the on and off of each switch so as to communicate each closed circuit and further complete the regulation of the current of the power grid.
Most preferably, the control drive unit further comprises:
the input end of the sensor system is respectively connected with a power grid, an input power supply, a primary winding of the coupling inductor and a secondary winding of the coupling inductor, and a power grid voltage feedback signal of the power grid, a voltage feedback signal of the input power supply, a first current feedback signal of the primary winding of the coupling inductor and a second current feedback signal of the secondary winding of the coupling inductor are respectively acquired;
the input end of the DSP is connected with the first output end of the sensor system, and is used for carrying out voltage signal processing on the power grid voltage feedback signal and respectively generating the first current reference signal and the second current reference signal;
the first input end of the control circuit is connected with the output end of the DSP, the second input end of the control circuit is connected with the output end of the sensor system, and current comparison control is carried out according to the first current reference signal and the second current reference signal and a signal obtained by subtracting the first current feedback signal and the second current feedback signal to respectively generate a first switch logic signal, a second switch logic signal, a third switch logic signal and a fourth switch logic signal;
and the input end of the driving circuit is connected with the output end of the control circuit, the output ends of the driving circuit are respectively connected with the first switch, the second switch, the third switch and the fourth switch, and a first driving signal, a second driving signal, a third driving signal and a fourth driving signal are correspondingly generated according to the first switch logic signal, the second switch logic signal, the third switch logic signal and the fourth switch logic signal so as to correspondingly drive the on-off of each switch.
Most preferably, the sensor system comprises:
the input end of the power grid voltage sensor is connected with a power grid, and the first output end of the power grid voltage sensor is connected with the input end of the DSP and used for collecting the power grid voltage feedback signal and transmitting the power grid voltage feedback signal to the DSP;
the input end of the input voltage sensor is connected with the input power supply, and the first output end of the input voltage sensor is connected with the input end of the DSP and used for collecting the input power supply voltage feedback signal and transmitting the input power supply voltage feedback signal to the DSP;
the input end of the first current sensor is connected with the primary winding of the transformer, and the output end of the first current sensor is connected with the second input end of the control circuit and used for collecting the first current feedback signal and transmitting the first current feedback signal to the control circuit;
and the input end of the second current sensor is connected with the secondary winding of the transformer, and the output end of the second current sensor is connected with the second input end of the control circuit, and is used for acquiring the second current feedback signal and transmitting the second current feedback signal to the control circuit.
Most preferably, the Digital Signal Processor (DSP) comprises:
the input end of the first analog-to-digital conversion module is connected with the first output end of the power grid voltage sensor, and the first analog-to-digital conversion module is used for performing first analog-to-digital conversion on the power grid voltage feedback signal to obtain a first digital signal;
the input end of the phase-locked loop is connected with the first output end of the first analog-to-digital conversion module, and the phase-locked loop is used for digitally processing the first digital signal to obtain the voltage phase of the power grid;
the input end of the second analog-to-digital conversion module is connected with the output end of the input voltage sensor, and the second analog-to-digital conversion module is used for performing second analog-to-digital conversion on the input power supply voltage feedback signal to obtain a second digital signal;
a first current reference calculation module, a first input end of which is connected with a first output end of the phase-locked loop, a second input end of which is connected with a second output end of the first analog-to-digital conversion module, and which calculates a first current reference signal according to the first digital signal and the voltage phase to obtain a first current reference digital signal;
the input end of the first digital-to-analog conversion module is connected with the output end of the first current reference calculation module, and the first digital-to-analog conversion module is used for performing first digital-to-analog conversion on the reference digital signal of the first current to obtain a first current reference signal;
a second current reference calculation module, a first input end of which is connected to a second output end of the phase-locked loop, a second input end of which is connected to a third output end of the first analog-to-digital conversion module, and a third input end of which is connected to an output end of the second analog-to-digital conversion module, wherein the second current reference calculation module performs second current reference signal calculation according to the voltage phase, the first digital signal and the second digital signal to obtain a second reference digital signal;
and the input end of the second digital-to-analog conversion module is connected with the output end of the second current reference calculation module, and the second digital-to-analog conversion module performs second digital-to-analog conversion on the second reference digital signal to obtain a second current reference signal.
Most preferably, the driving circuit further comprises: and the output ends of the first driving circuit, the second driving circuit, the third driving circuit and the fourth driving circuit are respectively connected with the first switch, the second switch, the third switch and the fourth switch.
Most preferably, the control circuit comprises:
a first comparator, a first input end of which is connected with a second output end of the grid voltage sensor, a second input end of which is connected with a second output end of the input voltage sensor, and which compares the input power supply voltage feedback signal with the grid voltage feedback signal to obtain a first mode selection signal;
the input end of the second comparator is connected with the third output end of the power grid voltage sensor, and the power grid voltage feedback signal is compared with the ground to obtain a second mode selection signal;
the input end of the first inverter is connected with the first output end of the first comparator to obtain a third mode selection signal;
the input end of the second inverter is connected with the first output end of the second comparator to obtain a fourth mode selection signal;
a first current regulator, a first input end of which is connected with an output end of the first digital-to-analog conversion module, a second input end of which is connected with an output end obtained by subtracting the first current feedback signal from the second current feedback signal, and the first current regulator performs first current regulation on a signal obtained by subtracting the first current feedback signal from the second current feedback signal and the first current reference signal to obtain a first high-frequency switching signal;
a second current regulator, a first input end of which is connected with an output end of the second digital-to-analog conversion module, a second input end of which is connected with an output end obtained by subtracting the first current feedback signal from the second current feedback signal, and performing second current regulation on a signal obtained by subtracting the first current feedback signal from the second current feedback signal and the second current reference signal to obtain a second high-frequency switching signal;
the input end of the third inverter is connected with the first output end of the second current regulator to obtain a third high-frequency switching signal;
a first AND gate, a first input terminal of which is connected to the second output terminal of the first comparator and a second input terminal of which is connected to the second output terminal of the second comparator, for obtaining a fifth mode selection signal according to the first and second mode selection signals;
a first input end of the first AND gate is connected with the output end of the first inverter, a second input end of the first AND gate is connected with a third output end of the first comparator, and a sixth mode selection signal is obtained according to the first mode selection signal and the third mode selection signal;
a first input end of the first and gate is connected with a first output end of the first current regulator, a second input end of the first and gate is connected with an output end of the first inverter, and a first high-frequency switching signal is obtained according to the first high-frequency switching signal and the first mode selection signal;
a fourth and gate, a first input terminal of which is connected to the output terminal of the third inverter, a second input terminal of which is connected to the output terminal of the second and gate, and a fifth high frequency switching signal is obtained according to the sixth mode selection signal and the third high frequency switching signal;
a first or gate, a first input end of which is connected with the output end of the fourth and gate, a second input end of which is connected with the output end of the third and gate, and a sixth high-frequency switching signal is obtained according to the fourth and fifth high-frequency switching signals;
a second or gate, a first input end of which is connected to the first output end of the first or gate, a second input end of which is connected to the first output end of the first and gate, and a third switching logic signal is obtained according to the fifth mode selection signal and the sixth high-frequency switching signal and transmitted to the third driving circuit;
a fifth and gate, a first input terminal of which is connected to the second output terminal of the first and gate, a second input terminal of which is connected to the output terminal of the first current regulator, and a seventh high frequency switching signal is obtained according to the fifth mode selection signal and the first high frequency switching signal;
a third or gate, a first input end of which is connected to the output end of the fifth and gate, a second input end of which is connected to the second output end of the second or gate, and a first switching logic signal is obtained according to the seventh high-frequency switching signal and the third switching logic signal and transmitted to the first driving circuit;
the input end of the fourth inverter is connected with the second output end of the third OR gate, and a second switch logic signal is obtained according to the first switch logic signal and is transmitted to the second driving circuit;
an input end of the fifth inverter is connected with a third output end of the first AND gate to obtain a seventh mode selection signal;
the input end of the sixth inverter is connected with the second output end of the first OR gate to obtain an eighth high-frequency switching signal;
and a sixth and gate, a first input terminal of which is connected to the output terminal of the fifth inverter, a second input terminal of which is connected to the output terminal of the sixth inverter, and an output terminal of which is connected to the input terminal of the fourth driving circuit, wherein a fourth switching logic signal is obtained according to the seventh mode selection signal and the eighth high frequency switching signal, and is transmitted to the fourth driving circuit.
The utility model provides a buck-boost inverter control method, which is realized based on a buck-boost inverter and comprises the following steps:
step 1: the method comprises the steps that a sensor system monitors input voltage and power grid voltage in real time, first judgment is conducted on the input voltage and the power grid voltage, and the input voltage is judged to be larger than or smaller than the power grid voltage;
step 2: the method comprises the following steps that a sensor system monitors the voltage of a power grid in real time, the power frequency cycle of the voltage of the power grid is judged for the second time, and the power frequency cycle of the voltage of the power grid is judged to be a positive half cycle or a negative half cycle;
and step 3: when the power frequency cycle of the power grid voltage is a positive half cycle and the input voltage is greater than the power grid voltage, controlling a driving unit to regulate and control a first switch and/or a second switch so as to conduct a first closed loop and/or a first follow current loop, and enabling a signal obtained by subtracting the first current feedback signal and the second current feedback signal to track a first reference current so as to finish the current regulation of the power grid;
and 4, step 4: when the power frequency cycle of the power grid voltage is a negative half cycle or the power frequency cycle of the power grid voltage is a positive half cycle and the input voltage is less than the power grid voltage, the control driving unit regulates and controls the first switch, the second switch, the third switch and/or the fourth switch to conduct the first closed loop and/or the second follow current loop, so that a signal obtained by subtracting the first current feedback signal and the second current feedback signal tracks the second reference current to complete the current regulation of the power grid.
Most preferably, the driving unit regulates the first switch and/or the second switch of the inverter including the steps of:
step 3.1: the control driving unit regulates and controls the fourth switch to be turned off, and the third switch is turned on, so that the second follow current loop is turned off;
step 3.2: subtracting first and second current feedback signals respectively acquired by a first current sensor and a second current sensor in real time, and comparing the subtracted signals with a first current reference signal generated by a DSP;
step 3.3: when the signal obtained by subtracting the first current feedback signal from the second current feedback signal is smaller than the first current reference signal, the control driving unit regulates and controls the conduction of the first switching tube, so that the first closed loop is conducted, the input power supply regulates the current increase of the filter inductor through the first closed loop, and the current regulation of the power grid is completed;
step 3.4: when the signal obtained by subtracting the first current feedback signal from the second current feedback signal is greater than the first current reference signal, the control driving unit controls the first switching tube to be turned off, the first follow current loop is turned on, the current of the filter inductor is reduced, and the current regulation of the power grid is completed.
Most preferably, controlling the driving unit to regulate the first switch, the second switch, the third switch and/or the fourth switch of the inverter comprises:
step 4.1: judging the working mode of the inverter for the second time, and judging that the working mode of the inverter is a boosting mode or a boosting and reducing mode;
step 4.2: comparing a signal obtained by subtracting a first current feedback signal and a second current feedback signal acquired by a first current sensor and a second current sensor respectively in real time with a second current reference signal generated by a DSP;
step 4.3: when the power frequency cycle of the power grid voltage is positive half cycle and the input voltage is less than the power grid voltage, the working mode of the inverter is a boosting mode, and the control driving unit regulates and controls all high-frequency switches;
step 4.4: when the signal obtained by subtracting the first current feedback signal from the second current feedback signal is greater than the second current reference signal, the control driving unit regulates and controls the conduction of the first switching tube and the third switching tube, so that the first closed loop is conducted, the current of an input power supply through the first closed loop to regulate the filter inductor is reduced, and the current regulation of a power grid is completed;
step 4.5: when the signal obtained by subtracting the first current feedback signal from the second current feedback signal is smaller than the second current reference signal, the control driving unit controls the first switching tube and the third switching tube to be turned off, the second follow current loop is conducted, the current of the filter inductor is increased, and the current regulation of the power grid is completed;
step 4.6: when the power frequency cycle of the power grid voltage is negative half cycle, the working mode of the inverter is a buck-boost mode, and the control driving unit regulates and controls all high-frequency switches;
step 4.7: when the signal obtained by subtracting the first current feedback signal from the second current feedback signal is smaller than the second current reference signal, the control driving unit regulates and controls the conduction of the first switching tube and the third switching tube, so that the first closed loop is conducted, the input power supply regulates the negative reduction of the current of the filter inductor through the first closed loop, and the current regulation of the power grid is completed;
step 4.8: when the signal obtained by subtracting the first current feedback signal from the second current feedback signal is greater than the second current reference signal, the control driving unit controls the first switching tube and the third switching tube to be turned off, the second follow current loop is conducted, the current of the filter inductor is increased in a negative direction, and the current regulation of the power grid is completed.
Most preferably, the third and fourth switches are devices that can withstand a positive back voltage, such as: two reverse series connected MOSFETs or IGBTs.
The application of the utility model discloses, solved the problem that traditional photovoltaic inverter buck-boost conversion efficiency is low, eliminated the common mode leakage current phenomenon, realized the buck-boost transform, improved photovoltaic inverter system's transformation efficiency.
Compared with the prior art, the method has the following advantages:
1. the inverter provided by the utility model is single-stage conversion, and the conversion efficiency of the inverter system is improved.
2. The inverter provided by the utility model can realize buck-boost conversion.
3. The inverter provided by the utility model has the advantages that the input power supply and the power grid are grounded together, and the common-mode leakage current of the photovoltaic inverter can be effectively eliminated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of the inverter circuit provided in the embodiment of the present application;
fig. 2 is a schematic circuit diagram of a control driving unit according to an embodiment of the present disclosure.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described with reference to the accompanying drawings, the described embodiments should not be considered as limiting the present application, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
In the following description, reference is made to "some embodiments," "one or more embodiments," which describe a subset of all possible embodiments, but it is understood that "some embodiments," "one or more embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.
In the following description, references to the terms "first \ second \ third" are used for respective similar objects only and do not denote a particular order or importance to the objects, it being understood that "first \ second \ third" may be interchanged under certain circumstances or sequences of events to enable embodiments of the application described herein to be practiced in other than those illustrated or described.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.
The present embodiment provides a buck-boost inverter, as shown in fig. 1, including: input power supply UinA coupling inductor L, a first switch S1A second switch S2And a third switch S3And a fourth switch S4Filter capacitor C1Filter inductor LgDamping resistor RdAnd a control drive unit (not shown in the drawings).
Input power supply UinThe negative pole of the power supply is connected with the negative pole of the power grid U and the input power supply UinAnd the negative pole of the grid U are commonly grounded. Wherein, the input power UinFor providing electrical energy to the inverter; and input the power UinIs grounded together with the power grid U, and can effectively eliminate the inverseCommon mode leakage current of the inverter. In the present embodiment, the input power UinAnd may be a photovoltaic cell, a vehicle battery, a fuel cell, or the like.
A filter unit including a filter inductor LgDamping resistor RdAnd a filter capacitor C1(ii) a Filter inductance LgThe first end of the damping resistor R is connected with the positive pole of the power grid UdRespectively with a second switch S2Is connected with the negative pole of the power grid U, and a damping resistor RdSecond terminal and filter capacitor C1Is connected with the first end of the first connecting pipe;
a coupling inductor L including a primary winding NPAnd secondary winding NS(ii) a Primary winding N of coupling inductance LPFirst terminals of the first and second inductors are respectively connected with the filter inductor LgSecond terminal, filter capacitor C1And a secondary winding N of the coupling inductorSIs connected with the fourth end of the primary winding N of the coupling inductor LPRespectively pass through a third switch S3A first switch S1And the input power supply UinThe positive electrode of (1) is connected;
then input power UinIn turn with the first switch S1And a third switch S3Primary winding N of coupled inductorPThe filtering unit and the power grid U are connected in series to form a first closed loop;
primary winding N of coupling inductorPIn turn with a third switch S3A second switch S2The power grid U and the filtering unit are connected in series to form a first follow current loop;
secondary winding N of coupling inductorSRespectively pass through a fourth switch S4A second switch S2Is connected with the negative pole of the power grid U;
then the secondary winding N of the coupled inductorSIn turn with a fourth switch S4A second switch S2The power grid U and the filtering unit are connected in series to form a second follow current loop;
the input end of the control drive unit is respectively connected with the power grid U and the input power supply UinPrimary winding N of coupled inductorPAnd a secondary winding N of the coupling inductorSConnected with the output ends of the first switchesOff S1A second switch S2And a third switch S3And a fourth switch S4And the connection is used for respectively driving and controlling the on-off of each switch to communicate each closed circuit, so as to further finish the regulation of the current of the power grid.
In this embodiment, the filter capacitor C1Is a non-polar capacitor.
Wherein the first switch S1And a second switch S2Both are metal oxide semiconductor field effect transistor (MOS) transistors and/or Insulated Gate Bipolar Transistors (IGBTs); third switch S3And a fourth switch S4Are both anti-series connections of two Metal Oxide Semiconductor (MOS) transistors and/or Insulated Gate Bipolar Transistors (IGBTs).
Wherein, as shown in fig. 2, the control drive unit further includes: a sensor system 1, a Digital Signal Processor (DSP)2, a control circuit 3 and a drive circuit 4.
The input end of the sensor system 1 is respectively connected with a power grid U and an input power supply UinPrimary winding N of coupled inductorPAnd a secondary winding N of the coupling inductorSConnecting and respectively acquiring grid voltage feedback signals U of a power grid UgfInput power supply UinVoltage feedback signal U ofinfPrimary winding N of coupled inductorPFirst current feedback signal iL1fAnd a secondary winding N of the coupling inductorSSecond current feedback signal iL2f；
A DSP 2, the input end of which is connected with the first output end of the sensor system 1 and feeds back a grid voltage feedback signal U of the grid UgfProcessing the voltage signal and respectively generating a first current reference signal iref1And the second current reference signal iref2；
A control circuit 3 having a first input connected to the output of the DSP 2 and a second input connected to the output of the sensor system 1, based on a first current reference signal iref1And the second current reference signal iref2With the first current feedback signal iL1fAnd the second current feedback signal iL2fThe subtracted signals areRow current comparison control to generate first switch logic signals O1A second switching logic signal O2A third switch logic signal O3And a fourth switching logic signal O4；
A drive circuit 4 with an input end connected with the output end of the control circuit 3 and an output end respectively connected with the first switch S1A second switch S2And a third switch S3And a fourth switch S4Connected according to the first switch logic signal O1A second switching logic signal O2A third switch logic signal O3And a fourth switching logic signal O4Generating a first driving signal, a second driving signal, a third driving signal and a fourth driving signal to drive the switch S accordingly1-S4Opening and closing of (3).
Wherein the sensor system 1 comprises:
the input end of the grid voltage sensor 101 is connected with a grid U, the first output end of the grid voltage sensor is connected with the input end of the DSP 2, and the grid voltage sensor is used for collecting a grid voltage feedback signal U of the grid UgfAnd transmitting to the DSP 2;
input voltage sensor 102, input terminal and input power source UinConnected, the first output end is connected with the input end of the DSP 2 and used for collecting an input power supply UinInput power supply voltage feedback signal UinfAnd transmitting to the DSP 2;
first current sensor 103, input terminal and primary winding N of transformerPConnected with the second input terminal of the control circuit 3 at the output terminal for collecting the first current feedback signal iL1fAnd transmitted to the control circuit 3;
a second current sensor 104 having an input connected to the secondary winding N of the transformerSConnected with the second input terminal of the control circuit 3 at the output terminal for collecting the second current feedback signal iL2fAnd transmitted to the control circuit 3.
The Digital Signal Processor (DSP)2 includes:
a first analog-to-digital conversion module AD1, the input of which is connected to a first analog-to-digital conversion module of the grid voltage sensor 101 in the sensor system 1The output end is connected with a grid voltage feedback signal U of a grid UgfPerforming first analog-to-digital conversion to obtain a first digital signal;
the input end of the phase-locked loop 201 is connected with the first output end of the first analog-to-digital conversion module AD1, and the phase-locked loop performs digital processing on the first digital signal to obtain the voltage phase of the power grid U
A second analog-to-digital conversion module AD2, the input end of which is connected with the output end of the input voltage sensor 102 in the sensor system 1, and the input power U is connected with the input power UinInput power supply voltage feedback signal UinfPerforming a second analog-to-digital conversion to obtain a second digital signal;
a first current reference calculation module 202, a first input end of which is connected to the first output end of the phase-locked loop 201, a second input end of which is connected to the first output end of the first analog-to-digital conversion module AD1, and a voltage phase of the power grid U according to the first digital signal
Calculating a first current reference signal to obtain a first current reference digital signal;
the input end of the first digital-to-analog conversion module is connected with the output end of the first current reference calculation module, and the first digital-to-analog conversion module is used for performing first digital-to-analog conversion on the reference digital signal of the first current to obtain a first current reference signal;
a first digital-to-analog conversion module DA1, an input end of which is connected to an output end of the first current reference calculation module 202, for performing a first digital-to-analog conversion on the reference digital signal of the first current to obtain a first current reference signal iref1(ii) a First current reference signal iref1Satisfies the following conditions:
a second current reference calculating module 203, a first input terminal and a second input terminal of the phase locked loop 201The output end of the first analog-to-digital conversion module AD1 is connected, the second input end of the first analog-to-digital conversion module AD1 is connected, the third input end of the first analog-to-digital conversion module AD2 is connected, and the first input end of the first analog-to-digital conversion module AD 3578 is connected with the output end of the second analog-to-digital conversion module AD2 according to the voltage phase of the power grid U
The first digital signal and the second digital signal are used for calculating a second current reference signal to obtain a second reference digital signal;
an input end of the second digital-to-analog conversion module DA2 is connected to an output end of the second current reference calculation module 203, and performs a second digital-to-analog conversion on the second reference digital signal to obtain a second current reference signal iref2(ii) a And a second current reference signal iref2Foot:
the drive circuit 4 further includes: a first driving circuit 401, a second driving circuit 402, a third driving circuit 403 and a fourth driving circuit 404, the output terminals of which are respectively connected to the first switch S1A second switch S2And a third switch S3And a fourth switch S4And (4) connecting.
Wherein, the control circuit 3 includes:
a first comparator 301, having a first input connected to the second output of the grid voltage sensor 101 in the sensor system 1 and a second input connected to the second output of the input voltage sensor 102 in the sensor system 1, for coupling an input power source U to the first comparator 301inInput power supply voltage feedback signal U ininfGrid voltage feedback signal U with grid UgfComparing to obtain a first mode selection signal;
a second comparator 302, the input of which is connected to the third output of the grid voltage sensor 101 in the sensor system 1, for providing a grid voltage feedback signal U of the grid UgfComparing with the ground to obtain a second mode selection signal;
a first inverter 303, an input end of which is connected to the first output end of the first comparator 301, for obtaining a third mode selection signal;
a second inverter 304, an input terminal of which is connected to the first output terminal of the second comparator 302, for obtaining a fourth mode selection signal;
a first current regulator 305 having a first input connected to the output of the first digital-to-analog conversion module DA1 and a second input connected to the first current feedback signal iL1fAnd a second current feedback signal iL2fThe output ends after subtraction are connected to feed back a first current signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfAnd a first current reference signal iref1Carrying out first-time current regulation to obtain a first high-frequency switching signal;
a second current regulator 306 having a first input connected to the output of the second digital-to-analog conversion module DA2 and a second input connected to the first current feedback signal iL1fAnd a second current feedback signal iL2fThe output ends after subtraction are connected to feed back a first current signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfAnd a second current reference signal iref2Carrying out second current regulation to obtain a second high-frequency switching signal;
a third inverter 307, the input terminal of which is connected to the first output terminal of the second current regulator 306, for obtaining a third high frequency switching signal;
a first and gate 308, a first input terminal of which is connected to the second output terminal of the first comparator 301 and a second input terminal of which is connected to the second output terminal of the second comparator 302, for obtaining a fifth mode selection signal according to the first and second mode selection signals;
a second and gate 309, a first input terminal of which is connected to the output terminal of the first inverter 303, a second input terminal of which is connected to the third output terminal of the second comparator 302, for obtaining a sixth mode selection signal according to the second and third mode selection signals;
a third and gate 310, a first input terminal of which is connected to the second output terminal of the second current regulator 306 and a second input terminal of which is connected to the output terminal of the second inverter 304, for obtaining a fourth high frequency switching signal according to the second high frequency switching signal and the second mode selection signal;
a fourth and gate 311, a first input terminal of which is connected to the output terminal of the third inverter 307 and a second input terminal of which is connected to the output terminal of the second and gate 309, and obtaining a fifth high frequency switching signal according to the sixth mode selection signal and the third high frequency switching signal;
a first or gate 312, a first input terminal of which is connected to the output terminal of the fourth and gate 311, a second input terminal of which is connected to the output terminal of the third and gate 310, and a sixth high frequency switching signal is obtained according to the fourth and fifth high frequency switching signals;
a second or gate 313, a first input terminal of which is connected to the first output terminal of the first or gate 312 and a second input terminal of which is connected to the first output terminal of the first and gate 308, for deriving a control third switch S in dependence on the fifth mode selection signal and the sixth high frequency switching signal3Third switch logic signal O3And transmitted to the third driving circuit 403 in the driving circuit 4;
a fifth and-gate 314 having a first input terminal connected to the second output terminal of the first and-gate 308 and a second input terminal connected to the output terminal of the first current regulator 305, and obtaining a seventh high frequency switching signal according to the fifth mode selection signal and the first high frequency switching signal;
a third OR-gate 315 having a first input connected to the output of the fifth AND-gate 314 and a second input connected to the second output of the second OR-gate 313, based on a seventh high frequency switching signal and a third switch S3Third switch logic signal O3Obtaining control of the first switch S1First switching logic signal O1And transmitted to the first driving circuit 401 in the driving circuit 4;
a fourth inverter 316 having an input terminal connected to the second output terminal of the third OR gate 315 according to the first switch S1First switching logic signal O1Obtaining control of the second switch S2Second switching logic signal O2And transmitted to the second driving circuit 402 in the driving circuit 4;
a fifth inverter 317, an input end of which is connected to the third output end of the first and gate 308, obtaining a seventh mode selection signal;
a sixth inverter 318 having an input terminal connected to the second output terminal of the first or gate 312 to obtain an eighth high frequency switching signal;
a sixth and gate 319 having a first input terminal connected to the output terminal of the fifth inverter 317, a second input terminal connected to the output terminal of the sixth inverter 318, and an output terminal connected to the input terminal of the fourth driving circuit 404 of the driving circuit 4, for obtaining a fourth switch S according to the seventh mode selection signal and the eighth high frequency switching signal4Of the fourth switching logic signal O4And transmitted to the fourth driving circuit 404 in the driving circuit 4.
In the present embodiment, the first current regulator 305 and the second current regulator 306 employ any one of PI control, hysteresis control, or proportional resonance control.
The utility model also provides a buck-boost inverter control method, which is realized based on the buck-boost inverter and comprises the following steps:
step 1: sensor system 1 monitors input voltage U in real timeinAnd the network voltage ugAnd for the input voltage UinAnd the network voltage ugIs first judged to determine the input power UinThe voltage is greater than or less than the U voltage of the power grid;
wherein, for the input voltage UinAnd the network voltage ugThe first determination of the size of (a) includes:
step 1.1: to input power UinInput power supply voltage feedback signal UinfGrid voltage feedback signal U of grid UgfJudging the size of the cell;
step 1.2: according to input power UinInput power supply voltage feedback signal UinfGrid voltage feedback signal U of grid UgfIs used for judging the input power UinThe voltage is greater than or less than the U voltage of the power grid;
step 2: sensor system real-time monitoring power grid voltage ugAnd to the grid voltage ugThe power frequency period of the power grid is judged for the second time to judge the voltage u of the power gridgThe power frequency cycle of (1) is a positive half cycle or a negative half cycle;
wherein, for the network voltage ugThe second determination of the power frequency cycle comprises:
step 2.1: network voltage feedback signal U to network UgfJudging the positive and negative values of the voltage;
step 2.2: according to the grid voltage feedback signal U of the grid UgfJudging whether the power frequency cycle of the U voltage of the power grid is a positive half cycle or a negative half cycle;
and step 3: when the power frequency cycle of the U voltage of the power grid is positive half cycle and the U voltage is input into the power supply UinWhen the voltage is greater than the U voltage of the power grid, the driving unit is controlled to regulate and control the first switch S1And/or a second switch S2To conduct the first closed loop and/or the first freewheeling loop so that the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfTracking a first reference current iref1To complete the current regulation of the grid;
wherein the drive unit regulates and controls a first switch S of the inverter1And/or a second switch S2The method comprises the following steps:
step 3.1: controlling the driving unit to regulate the fourth switch S4Off, third switch S3When the second freewheeling circuit is switched on, the second freewheeling circuit is switched off;
step 3.2: a first current feedback signal i acquired by the first current sensor 103 and the second current sensor 104 in the sensor system 1 respectively in real timeL1fAnd a second current feedback signal iL2fSubtracted signal iLfWith the first current reference signal i generated by the DSP 2ref1Comparing;
step 3.3: when the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfIs smaller than the first current reference signal iref1Then, the control drive unit regulates and controls the first switch tube S1When the input power supply is conducted, the first closed loop is conducted, and the input power supply adjusts the filter inductor L through the first closed loopgThe current is increased, and the current regulation of the power grid is completed;
step 3.4: when the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfGreater than the first current reference signal iref1Then, the control driving unit regulates and controls the first switch tube S1When the filter is turned off, the first follow current loop is conducted, and the filter inductor LgThe current of the grid is reduced, and the current regulation of the grid is completed.
And 4, step 4: when the power frequency cycle of the U voltage of the power grid is negative half cycle or the power frequency cycle of the U voltage of the power grid is positive half cycle and the U voltage of the power grid is input into a power supplyinWhen the voltage is less than the U voltage of the power grid, the driving unit is controlled to regulate and control the first switch S1A second switch S2And a third switch S3And/or a fourth switch S4To conduct the first closed loop and/or the second free-wheeling loop, so that the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfTracking the second reference current iref2To complete the current regulation of the grid.
Wherein the control drive unit regulates and controls a first switch S of the inverter1A second switch S2And a third switch S3And/or a fourth switch S4The method comprises the following steps:
step 4.1: judging the working mode of the inverter for the second time, and judging that the working mode of the inverter is a boosting mode or a boosting and reducing mode;
step 4.2: a first current feedback signal i acquired by the first current sensor 103 and the second current sensor 104 in the sensor system 1 respectively in real timeL1fAnd a second current feedback signal iL2fSubtracted signal iLfWith a second current reference signal i generated by the DSP 2ref2Comparing;
step 4.3: when the power frequency cycle of the U voltage of the power grid is positive half cycle and the U voltage is input into the power supply UinWhen the voltage is less than the U voltage of the power grid, the working mode of the inverter is a boosting mode, and the control driving unit regulates and controls all the high-frequency switches;
step 4.4: when the first current feedback signal iL1fAnd a second current feedback signaliL2fSubtracted signal iLfGreater than the second current reference signal iref2Then, the control drive unit regulates and controls the first switch tube S1And a third switching tube S3When the input power supply is conducted, the first closed loop is conducted, and the input power supply adjusts the filter inductor L through the first closed loopgThe current is reduced, and the current regulation of the power grid is completed;
step 4.5: when the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfIs smaller than the second current reference signal iref2Then, the control driving unit regulates and controls the first switch tube S1And a third switching tube S3When the second follow current loop is turned off, the second follow current loop is turned on, and the filter inductor LgThe current is increased, and the current regulation of the power grid is completed;
step 4.6: when the power frequency cycle of the U voltage of the power grid is negative half cycle, the working mode of the inverter is a voltage lifting mode, and the driving unit is controlled to regulate and control all high-frequency switches;
step 4.7: when the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfIs smaller than the second current reference signal iref2Then, the control driving unit regulates and controls the first switch tube S1And a third switching tube S3When the first closed loop is conducted, the input power supply U is conductedinFilter inductance L is adjusted through first closed loopgThe negative current is reduced, and the current regulation of the power grid is completed;
step 4.8: when the first current feedback signal iL1fAnd a second current feedback signal iL2fSubtracted signal iLfGreater than the second current reference signal iref2Then, the control driving unit regulates and controls the first switch tube S1And a third switching tube S3When the current is turned off, the second follow current loop is conducted, and the filter inductor LgThe negative current is increased to complete the current regulation of the power grid.
The working principle of the utility model is as follows:
the method comprises the steps that a sensor system monitors input voltage and power grid voltage in real time, first judgment is conducted on the input voltage and the power grid voltage, and the input voltage is judged to be larger than or smaller than the power grid voltage; the method comprises the following steps that a sensor system monitors the voltage of a power grid in real time, the power frequency cycle of the voltage of the power grid is judged for the second time, and the power frequency cycle of the voltage of the power grid is judged to be a positive half cycle or a negative half cycle; when the power frequency cycle of the power grid voltage is a positive half cycle and the input voltage is greater than the power grid voltage, controlling a driving unit to regulate and control a first switch and/or a second switch of the inverter so as to conduct a first closed loop and/or a first follow current loop, and enabling a signal obtained by subtracting a first current feedback signal and a second current feedback signal to track a first current reference signal so as to finish the current regulation of the power grid; and when the power frequency cycle of the power grid voltage is a negative half cycle or the power frequency cycle of the power grid voltage is a positive half cycle and the input voltage is less than the power grid voltage, controlling the driving unit to regulate and control the first switch, the second switch, the third switch and/or the fourth switch of the inverter so as to conduct the first closed loop and/or the second follow current loop, and enabling a signal obtained by subtracting the first current feedback signal and the second current feedback signal to track the second current reference signal so as to complete the current regulation of the power grid.
In conclusion, the buck-boost inverter and the control method thereof solve the problem of low buck-boost conversion efficiency of the traditional photovoltaic inverter, eliminate the common mode leakage current phenomenon, realize buck-boost conversion and improve the conversion efficiency of the photovoltaic inverter system.
The above description is only an example of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present application are included in the protection scope of the present application.
Claims (6)
1. A buck-boost inverter, comprising:
the negative pole of the input power supply is connected with the negative pole of the power grid, and the negative pole of the input power supply and the negative pole of the power grid are grounded together;
the filtering unit comprises a filtering inductor, a damping resistor and a filtering capacitor; the first end of the filter inductor is connected with the anode of the power grid, the first end of the damping resistor is respectively connected with the second end of the second switch and the cathode of the power grid, and the second end of the damping resistor is connected with the first end of the filter capacitor;
the coupling inductor comprises a primary winding and a secondary winding; the first end of the primary winding of the coupling inductor is respectively connected with the second end of the filter inductor, the second end of the filter capacitor and the fourth end of the secondary winding of the coupling inductor, the second end of the primary winding of the coupling inductor is respectively connected with the positive electrode of the input power supply through a third switch and a first switch, and the primary winding of the coupling inductor, the power grid, the filter unit, the input power supply, the third switch and the first switch form a first closed loop; the primary winding of the coupling inductor, the power grid, the filtering unit, the third switch and the second switch form a first follow current loop; the third end of the secondary winding of the coupling inductor is connected with the negative electrode of the power grid through a fourth switch and the second switch respectively, so that the secondary winding of the coupling inductor forms a second follow current loop with the power grid, the filtering unit, the fourth switch and the second switch;
and the input end of the control driving unit is respectively connected with a power grid, an input power supply, the primary winding of the coupling inductor and the secondary winding of the coupling inductor, and the output end of the control driving unit is respectively connected with the first switch, the second switch, the third switch and the fourth switch and is used for respectively driving and controlling the on and off of each switch so as to communicate each closed circuit and further complete the regulation of the current of the power grid.
2. The buck-boost inverter of claim 1, wherein the control drive unit further comprises:
the input end of the sensor system is respectively connected with a power grid, an input power supply, a primary winding of the coupling inductor and a secondary winding of the coupling inductor, and a power grid voltage feedback signal of the power grid, a voltage feedback signal of the input power supply, a first current feedback signal of the primary winding of the coupling inductor and a second current feedback signal of the secondary winding of the coupling inductor are respectively acquired;
the input end of the DSP is connected with the first output end of the sensor system, and is used for carrying out voltage signal processing on the power grid voltage feedback signal and respectively generating the first current reference signal and the second current reference signal;
the first input end of the control circuit is connected with the output end of the DSP, the second input end of the control circuit is connected with the output end of the sensor system, and current comparison control is carried out according to the first current reference signal and the second current reference signal and a signal obtained by subtracting the first current feedback signal and the second current feedback signal to respectively generate a first switch logic signal, a second switch logic signal, a third switch logic signal and a fourth switch logic signal;
and the input end of the driving circuit is connected with the output end of the control circuit, the output ends of the driving circuit are respectively connected with the first switch, the second switch, the third switch and the fourth switch, and a first driving signal, a second driving signal, a third driving signal and a fourth driving signal are correspondingly generated according to the first switch logic signal, the second switch logic signal, the third switch logic signal and the fourth switch logic signal so as to correspondingly drive the on-off of each switch.
3. The buck-boost inverter of claim 2, wherein the sensor system comprises: the input end of the power grid voltage sensor is connected with a power grid, and the first output end of the power grid voltage sensor is connected with the input end of the DSP and used for collecting the power grid voltage feedback signal and transmitting the power grid voltage feedback signal to the DSP;
the input end of the input voltage sensor is connected with the input power supply, and the first output end of the input voltage sensor is connected with the input end of the DSP and used for collecting the input power supply voltage feedback signal and transmitting the input power supply voltage feedback signal to the DSP;
the input end of the first current sensor is connected with the primary winding, and the output end of the first current sensor is connected with the second input end of the control circuit and used for collecting the first current feedback signal and transmitting the first current feedback signal to the control circuit;
and the input end of the second current sensor is connected with the secondary winding, and the output end of the second current sensor is connected with the second input end of the control circuit and used for acquiring the second current feedback signal and transmitting the second current feedback signal to the control circuit.
4. The buck-boost inverter of claim 3, wherein the DSP comprises:
the input end of the first analog-to-digital conversion module is connected with the first output end of the power grid voltage sensor, and the first analog-to-digital conversion module is used for performing first analog-to-digital conversion on the power grid voltage feedback signal to obtain a first digital signal;
the input end of the phase-locked loop is connected with the first output end of the first analog-to-digital conversion module, and the phase-locked loop is used for digitally processing the first digital signal to obtain the voltage phase of the power grid;
the input end of the second analog-to-digital conversion module is connected with the output end of the input voltage sensor, and the second analog-to-digital conversion module is used for performing second analog-to-digital conversion on the input power supply voltage feedback signal to obtain a second digital signal;
a first current reference calculation module, a first input end of which is connected with a first output end of the phase-locked loop, a second input end of which is connected with a second output end of the first analog-to-digital conversion module, and which calculates a first current reference signal according to the first digital signal and the voltage phase to obtain a first current reference digital signal;
the input end of the first digital-to-analog conversion module is connected with the output end of the first current reference calculation module, and the first digital-to-analog conversion module is used for performing first digital-to-analog conversion on the reference digital signal of the first current to obtain a first current reference signal;
a second current reference calculation module, a first input end of which is connected to a second output end of the phase-locked loop, a second input end of which is connected to a third output end of the first analog-to-digital conversion module, and a third input end of which is connected to an output end of the second analog-to-digital conversion module, wherein the second current reference calculation module performs second current reference signal calculation according to the voltage phase, the first digital signal and the second digital signal to obtain a second reference digital signal;
and the input end of the second digital-to-analog conversion module is connected with the output end of the second current reference calculation module, and the second digital-to-analog conversion module performs second digital-to-analog conversion on the second reference digital signal to obtain a second current reference signal.
5. The buck-boost inverter of claim 2, wherein the drive circuit further comprises: and the output ends of the first driving circuit, the second driving circuit, the third driving circuit and the fourth driving circuit are respectively connected with the first switch, the second switch, the third switch and the fourth switch.
6. The buck-boost inverter of claim 4, wherein the control circuit comprises:
a first comparator, a first input end of which is connected with a second output end of the grid voltage sensor, a second input end of which is connected with a second output end of the input voltage sensor, and which compares the input power supply voltage feedback signal with the grid voltage feedback signal to obtain a first mode selection signal;
the input end of the second comparator is connected with the third output end of the power grid voltage sensor, and the power grid voltage feedback signal is compared with the ground to obtain a second mode selection signal;
the input end of the first inverter is connected with the first output end of the first comparator to obtain a third mode selection signal;
the input end of the second inverter is connected with the first output end of the second comparator to obtain a fourth mode selection signal;
a first current regulator, a first input end of which is connected with an output end of the first digital-to-analog conversion module, a second input end of which is connected with an output end of the first current feedback signal subtracted from the second current feedback signal, and a first current reference signal and a signal obtained by subtracting the first current feedback signal from the second current feedback signal are subjected to first current regulation to obtain a first high-frequency switching signal;
a second current regulator, a first input end of which is connected with an output end of the second digital-to-analog conversion module, a second input end of which is connected with an output end obtained by subtracting the first current feedback signal from the second current feedback signal, and a signal obtained by subtracting the first current feedback signal from the second current feedback signal and the second current reference signal are subjected to second current regulation to obtain a second high-frequency switching signal;
the input end of the third inverter is connected with the first output end of the second current regulator to obtain a third high-frequency switching signal;
a first AND gate, a first input terminal of which is connected to the second output terminal of the first comparator and a second input terminal of which is connected to the second output terminal of the second comparator, for obtaining a fifth mode selection signal according to the first and second mode selection signals;
a first input end of the first AND gate is connected with the output end of the first inverter, a second input end of the first AND gate is connected with a third output end of the first comparator, and a sixth mode selection signal is obtained according to the first mode selection signal and the third mode selection signal;
a first input end of the first and gate is connected with a first output end of the first current regulator, a second input end of the first and gate is connected with an output end of the first inverter, and a first high-frequency switching signal is obtained according to the first high-frequency switching signal and the first mode selection signal;
a fourth and gate, a first input terminal of which is connected to the output terminal of the third inverter, a second input terminal of which is connected to the output terminal of the second and gate, and a fifth high frequency switching signal is obtained according to the sixth mode selection signal and the third high frequency switching signal;
the first input end of the first OR gate is connected with the output end of the fourth AND gate, the second input end of the first OR gate is connected with the output end of the third AND gate, and a sixth high-frequency switching signal is obtained according to the fourth high-frequency switching signal and the fifth high-frequency switching signal;
a second or gate, a first input end of which is connected to the first output end of the first or gate, a second input end of which is connected to the first output end of the first and gate, and a third switching logic signal is obtained according to the fifth mode selection signal and the sixth high-frequency switching signal and transmitted to a third driving circuit;
a fifth and gate, a first input terminal of which is connected to the second output terminal of the first and gate, a second input terminal of which is connected to the output terminal of the first current regulator, and a seventh high frequency switching signal is obtained according to the fifth mode selection signal and the first high frequency switching signal;
a first input end of the first or gate is connected with the output end of the first high-frequency switching signal, a second input end of the first or gate is connected with the second output end of the second or gate, and a first switching logic signal is obtained according to the first high-frequency switching signal and the first switching logic signal and is transmitted to the first driving circuit;
the input end of the fourth inverter is connected with the second output end of the third OR gate, and a second switch logic signal is obtained according to the first switch logic signal and is transmitted to the second driving circuit;
an input end of the fifth inverter is connected with a third output end of the first AND gate to obtain a seventh mode selection signal;
the input end of the sixth inverter is connected with the second output end of the first OR gate to obtain an eighth high-frequency switching signal;
and a sixth and gate, a first input terminal of which is connected to the output terminal of the fifth inverter, a second input terminal of which is connected to the output terminal of the sixth inverter, and an output terminal of which is connected to the input terminal of the fourth driving circuit, wherein a fourth switching logic signal is obtained according to the seventh mode selection signal and the eighth high frequency switching signal, and is transmitted to the fourth driving circuit.
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