CN103475258B - The high-voltage pulse power source of adjustable discharge parameter - Google Patents

Abstract

The invention discloses a high-voltage pulse power supply with adjustable discharge parameters, including a power supply unit, a filtering and rectifying unit, an auxiliary power supply, a DC-DC main converter, a high-voltage pulse sending unit, a driving and protection unit, and a power supply output parameter control unit. The power supply unit is connected to the input end of the filter and rectification unit, and the output end of the filter and rectification unit is respectively connected to the auxiliary power supply and the DC-DC main converter, and the DC-DC main converter is also connected to the high-voltage pulse transmission unit and the power output The parameter control unit is connected, and the power output parameter control unit is also connected with the high-voltage pulse sending unit through the drive and protection unit. The invention is jointly powered by photovoltaic and mains power, can adjust the voltage and pulse parameters of the output end of the power supply, greatly improves the applicable occasions of the high-voltage pulse power supply, can be widely used in the field of water treatment systems, and has good application prospects.

Description

High Voltage Pulse Power Supply with Adjustable Discharge Parameters

technical field

The invention relates to the technical field of power supplies, in particular to a high-voltage pulse power supply with adjustable discharge parameters.

Background technique

Traditional high-voltage power supply devices generally do not have a complete and detailed implementation plan, and there is no detection circuit, so it is impossible to judge whether the high-voltage power supply device is operating normally, and it is impossible to obtain the input power and output discharge power of the high-voltage power supply device, so that it is impossible to realize the output voltage of the power supply. And the adjustment of the pulse, which limits the applicable occasions of the high-voltage power supply device.

Contents of the invention

The technical problem solved by the present invention is to overcome the problem in the prior art that the adjustment of the voltage and pulse of the output terminal of the power supply cannot be realized, and the applicable occasions of the high-voltage power supply device are limited.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A high-voltage pulse power supply with adjustable discharge parameters is characterized in that it includes a power supply unit, a filtering and rectifying unit, an auxiliary power supply, a DC-DC main converter, a high-voltage pulse sending unit, a driving and protection unit, and a power output parameter control unit, The power supply unit is connected to the input end of the filtering and rectifying unit, and the output end of the filtering and rectifying unit is respectively connected to the auxiliary power supply and the DC-DC main converter, and the DC-DC main converter is also connected to the high-voltage The pulse sending unit is connected with the power output parameter control unit, and the power output parameter control unit is also connected with the high-voltage pulse sending unit through the drive and protection unit. Converter, high-voltage pulse sending unit, drive and protection unit and power output parameter control unit are powered.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the power supply unit includes a photovoltaic module, a surge protection unit, a grid-connected photovoltaic inverter, an off-grid photovoltaic inverter with energy storage, and a channel selector, The power output end of the photovoltaic module is respectively connected to the power input end of the off-grid photovoltaic inverter with energy storage and the power input end of the grid-connected photovoltaic inverter through the surge protection unit, and the off-grid photovoltaic inverter with energy storage The power output terminals of the grid-connected photovoltaic inverter and the grid-connected photovoltaic inverter are respectively connected to the input terminals of the channel selector, and the input terminal of the channel selector is also connected to the mains, and the output terminal of the channel selector is used as a power supply unit The output terminal is connected with the filtering and rectifying unit.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the photovoltaic module is provided with a photovoltaic energy collection and charging unit for maximum power point tracking control, and the photovoltaic energy collection and charging unit includes a photovoltaic panel PV and a photovoltaic output current sampling circuit CS1, main converter Buck, charging current sampling circuit CS2, battery B, MCU, voltage and current feedback control network, the photovoltaic panel PV is connected to the MCU through the photovoltaic output current sampling circuit CS1, and the battery B is sampled by charging current The circuit CS2 is connected to the MCU, a main converter Buck is provided between the photovoltaic output current sampling circuit CS1 and the charging current sampling circuit CS2, and a voltage and current feedback is provided between the main converter Buck and the charging current sampling circuit CS2 A control network, the voltage and current feedback control network is also connected to the MCU.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the DC-DC main converter includes an interleaving power factor circuit and an adjustable inverter power supply circuit; the high-voltage pulse generating unit includes a power switch circuit and an energy Recovery circuit and high-voltage pulse forming circuit; the power output parameter control unit includes an output voltage adjustment circuit, a pulse repetition rate adjustment circuit and a pulse width adjustment circuit; the interleaved power factor circuit receives the voltage of the filter and rectification unit, and the output is constant High voltage, and supply power to the adjustable inverter power supply circuit, the adjustable inverter power supply circuit supplies power to the power switch and energy recovery circuit in the high-voltage pulse generating unit, and the power switch and energy recovery circuit are under the control of the drive and protection unit, Work together with the high-voltage pulse forming circuit to generate high-voltage pulse output; the output voltage adjustment circuit in the power output parameter control unit sends an output voltage adjustment signal to the adjustable inverter power supply unit of the DC-DC main inverter, so that the DC- The DC main converter provides an adjustable output voltage to the high-voltage pulse generating unit; the pulse repetition rate adjustment circuit and the pulse width adjustment circuit in the power output parameter control unit control the driving and protection unit to control the high-voltage pulse forming circuit in the high-voltage pulse generating unit Output adjustable high voltage pulse signal.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the drive and protection unit includes a power switch drive circuit and an overload protection circuit, and the power switch drive circuit is used to drive and control the output of the high-voltage pulse generation unit. High voltage pulse signal.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the power factor correction unit includes a controller UP1, power factor inductors L3-L4, rectifier diodes D1-D2 and power switch tubes Q1-Q2, the controller The signals of the switch drive signal output terminals DRV1 and DRV2 of UP1 are reversed, and form an interleaved drive with the power switch tubes Q1 and Q2, so that the current in the power factor inductor L3-L4 is in an interleaved state; the output terminals ZCD1 and ZCD2 of the controller UP1 The power factor inductors L3-L4 and rectifier diodes D1-D2 are respectively used as the output terminal VH2 of the power factor correction unit, and the voltage of the output terminal VH2 of the power factor correction unit is sent to the FB of the controller UP1 through the feedback circuit composed of resistors R5 and R7 terminal feedback output voltage.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the adjustable inverter power supply circuit includes a power controller UP2, AND gates U1A-U1D, drive integrated circuits UD1-UD2, and a full-bridge inverter switch tube QD1 -QD4, the output terminals of the power controller UP2 are respectively connected to the driving integrated circuits UD1 and UD2 through the AND gates U1A-U1B and the AND gates U1C-U1D, and the output terminals of the driving integrated circuits UD1-UD2 drive the full-bridge inverter Inverter switch tubes QD1-QD4, the output terminals of the full-bridge inverter switch tubes QD1-QD4 output voltage AHV through the high-voltage transformer T.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the power output parameter control unit includes a microcontroller UC, an optocoupler U2, a voltage comparator A1-A2, a high-speed Schmitt trigger U5A and a digital Potentiometer Radj, the input terminal of the digital potentiometer Radj is connected with light touch switches K1 and K2 for changing its value, the output terminal is connected with the negative terminal of the voltage comparator A2, and the positive terminal of the voltage comparator A1 is externally connected The reference voltage, the reverse end of the voltage comparator A1 is externally connected to the output voltage AHV of the adjustable inverter power supply circuit, and the output terminals of the voltage comparator A1-A2 are controlled by the power supply of the photocoupler U2 and the adjustable inverter power supply circuit device UP2 is connected; the light touch switches KS, K3, K4, K5, K6 are respectively connected with the input and output ports of the microcontroller UC, and the microcontroller UC is controlled to output pulse repetition rate adjustment signals, pulse width adjustment signals and used for The drive signal of the power switch drive circuit is sent to the drive and protection unit.

The aforementioned high-voltage pulse power supply with adjustable discharge parameters is characterized in that: the power switch drive circuit includes high-speed voltage comparators A3-A6, high-speed Schmitt trigger U5B, high-speed NAND gates U4A and U4B, MOS transistors QA1 and QA2, the drive signal of the power switch drive circuit output by the power output parameter control unit sequentially passes through the power switch drive circuit composed of high-speed Schmitt triggers U5B, U4A, U4B and QA1, QA2; the overload protection circuit includes a voltage comparator A3, A4 and transistor Q3 form an overcurrent protection delay circuit of the adjustable inverter power supply circuit; the overload protection circuit also includes voltage comparators A5, A6 and transistor Q4, forming an overcurrent protection delay circuit of the high voltage pulse generating unit.

The beneficial effects of the present invention are: the high-voltage pulse power supply with adjustable discharge parameters of the present invention is provided with voltage and current detection circuits at the input and output terminals, effectively obtains the input power of the high-voltage power supply system and the discharge power at the output terminal, and effectively judges the high-voltage pulse power supply Whether the operation is normal or not, the discharge power of the output terminal can also be realized, and the voltage and pulse parameters of the output terminal of the power supply can be adjusted, which greatly improves the applicable occasions of high-voltage pulse power supply, and is powered by the joint power of photovoltaic and mains power, which is energy-saving and environmentally friendly, and can be widely used in water treatment. In the system field, adjusting the velocity of the water mist jet has a good application prospect.

Description of drawings

Fig. 1 is a system block diagram of the high-voltage pulse power supply with adjustable discharge parameters of the present invention.

Fig. 2 is a system block diagram of the power supply unit of the present invention.

Fig. 3 is a schematic diagram of battery charging of the power supply unit of the present invention.

Fig. 4 is a control flow chart of the photovoltaic module of the present invention.

Fig. 5 is a circuit diagram of the synchronous rectification Buck circuit of the photovoltaic module of the present invention.

Fig. 6 is a circuit diagram of the voltage and current sampling circuit of the photovoltaic module of the present invention.

FIG. 7 is a circuit diagram of a power factor correction unit of the present invention.

Fig. 8 is a circuit diagram of the adjustable inverter power supply circuit of the present invention.

Fig. 9 is a circuit diagram of the power output parameter control unit of the present invention.

FIG. 10 is a circuit diagram of a power switch driving circuit of the present invention.

Fig. 11 is a circuit diagram of a high-voltage pulse generating unit of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the high-voltage pulse power supply with adjustable discharge parameters of the present invention includes a power supply unit, a filter and rectifier unit, an auxiliary power supply, a DC-DC main converter, a high-voltage pulse transmission unit, a drive and protection unit, and power output parameters Control unit, the power supply unit is connected to the input end of the filter and rectification unit, the output end of the filter and rectification unit is respectively connected to the auxiliary power supply and the DC-DC main converter, and the DC-DC main converter is also connected to the high-voltage pulse The sending unit and the power output parameter control unit are connected, and the power output parameter control unit is also connected with the high-voltage pulse sending unit through the driving and protection unit. The high-voltage pulse sending unit, the drive and protection unit and the power output parameter control unit are powered.

The power supply unit includes a photovoltaic module, a surge protection unit, a grid-connected photovoltaic inverter, an off-grid photovoltaic inverter with energy storage, and a channel selector. The power input terminals of the off-grid photovoltaic inverter with energy storage and the grid-connected photovoltaic inverter are connected, and the power output terminals of the off-grid photovoltaic inverter with energy storage and the grid-connected photovoltaic inverter are respectively connected to the input of the channel selector. The input end of the channel selector is also connected to the mains, and the output end of the channel selector is used as the output end of the power supply unit to connect with the filtering and rectifying unit.

The working process of the power supply unit is as follows: the output of the photovoltaic module is first connected with the surge protection unit, and then sent to the off-grid photovoltaic inverter with energy storage. The photovoltaic energy first charges the energy storage device (battery), and when the energy of the battery When it is sufficient, it will work with photovoltaic modules to provide stable power supply to the off-grid photovoltaic inverter; in an environment with 220V AC mains power, through timely monitoring of the energy of the battery and photovoltaic modules, the energy of the battery and photovoltaic modules can meet the energy requirements of the system operation When the off-grid photovoltaic inverter with energy storage is used first, when the energy of the battery and photovoltaic modules cannot meet the system operation, it will automatically switch to 220V mains power; In the case of separate settlement, the grid-connected photovoltaic inverter can be used directly, which can be environmentally friendly, easy to use, and make full use of solar energy resources.

As shown in Figure 2, the photovoltaic module is provided with a maximum power point tracking control photovoltaic energy harvesting charging unit, the photovoltaic energy harvesting charging unit includes a photovoltaic panel PV, a photovoltaic output current sampling circuit CS1, a main converter Buck, a charging current Sampling circuit CS2, battery B, MCU, voltage and current feedback control network, the photovoltaic panel PV is connected to the MCU through the photovoltaic output current sampling circuit CS1, the battery B is connected to the MCU through the charging current sampling circuit CS2, the A main converter Buck is provided between the photovoltaic output current sampling circuit CS1 and the charging current sampling circuit CS2, and a voltage and current feedback control network is provided between the main converter Buck and the charging current sampling circuit CS2, and the voltage and current feedback The control network is also connected with the MCU. The photovoltaic module of the present invention adopts 12 pieces of 35V/275W photovoltaic panels (PV) to form a 2-series 6-parallel structure. The photovoltaic energy collection charging unit is used to charge and store the battery B. The battery B uses four 12V65Ah colloidal batteries connected in series. , forming a storage capacity of 48V65Ah. Under normal weather conditions, since the photovoltaic module is tracked and controlled by the maximum power point (MPP), it will change with the change of light and ambient temperature, so that the photovoltaic module works at MPP Nearby, effectively improve the utilization rate of solar energy.

The MCU collects the voltage and current of the battery B and the photovoltaic panel PV respectively. According to the actual voltage value of the battery B, through controlling the voltage and current feedback control network, the main converter Buck works at the stage shown in Figure 3, which is suitable for the battery In various modes of B charging, at the same time, the MCU collects real-time power at the PV terminal of the photovoltaic panel and the power at the B terminal of the battery, and uses the MPPT algorithm flow chart shown in Figure 4 to adjust the main converter Buck in real time to make the output of the photovoltaic panel PV at the maximum power point.

As shown in Figure 5, the synchronous rectification Buck circuit of the photovoltaic energy collection charging unit, the maximum power point tracking (MPPT) of the synchronous rectification (Synchronous Rectifier: SR) step-down (Buck) structure, uses the same frequency and opposite phase driving signals to drive the main The switching tube Q1 and the synchronous rectification tube Q2, that is, when Q1 is turned off, Q2 is turned on; when Q1 is turned on, Q2 is turned off, and the efficiency of the driver is significantly improved after adopting the synchronous rectification technology.

For Figure 3 and Figure 5 of the above invention, the output voltage Vo=VD1, the input voltage Vin=VS, when the characteristics of the switch tubes Q1 and Q2 are consistent, and the main transformer Buck is in a stable working state for a period of time, the main switch tube Q1 is on duty The ratio is D, the conduction duty ratio of the synchronous rectification switch tube Q2 is 1-D; the switch tube conduction voltage drop VQ1=I _Q1 R _on , VQ2=I _Q2 R _on . Therefore, in the ideal working state, according to the basic principle of switching power supply, the following equations of the synchronous rectification Buck circuit in continuous working mode can be obtained:

$\left\{\begin{array}{c}\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; vs.</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; VD</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; D.</span>}}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; sw</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}\mathrm{<span\; class="notranslate">\; r</span>}}\\ \mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; VD</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; TR</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ \mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}}\\ \mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; on</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; on</span>}}\end{array}\right.$

In the formula, L is the inductance of the filter inductor L1; VD1 is the output voltage of the synchronous rectification Buck circuit; I _C is the middle current of the inductor; I _O is the output current; I _PK is the peak current of the inductor; I _TR is the valley current of the inductor; ΔI is the ripple current; r is the ripple rate; V _S is the output voltage of the photovoltaic panel; R _on is the on-resistance of the switching tubes Q1 and Q2 with the same characteristics; I _Q is the switching tube current.

The peak current expression of inductor L1 is:

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; r</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

In the above formulas (1) and (2), when the current wave rate r=0.4, the expression of the highest switching current of the switching tube is

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; SW</span>}\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; LAVG</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; TR</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}$

The ripple of the output voltage of the synchronous rectification Buck circuit is ΔU, the output capacitance Co=Cout1+Cout2, the required minimum capacity and maximum equivalent resistance expressions are:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; \&Delta;\; U</span>}<span\; class="notranslate">\; -</span>\sqrt{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&Delta;\; U</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;IR</span>}}_{\mathrm{<span\; class="notranslate">\; ESR</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ]</span>}{{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; ESR</span>}}}\\ {\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; ESR</span>}\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;\; U</span>}}{\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}}\end{array}\right.$

In formula (4),

The expression of the average effective current required by the input capacitance C _in is

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; Irms</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; SW</span>}\mathrm{<span\; class="notranslate">\; max</span>}}\sqrt{\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span>}$

As shown in Figure 6, the voltage and current sampling circuit of the photovoltaic panel PV and battery B, the amplifier A1 and the current sampling resistor RS1 constitute the current output conversion circuit of the photovoltaic panel PV, the amplifier A4 and the sampling resistor RS2 constitute the current conversion circuit of the battery B, The MCU collects the voltage and current of the battery B and the PV terminal of the photovoltaic panel through the internal ADC, and adjusts the voltage and current feedback control network through the program flow control shown in Figure 4, and further controls the main circuit of the energy collection and charging Buck shown in Figure 2 Adjust the working mode to realize the MPPT control function of the PV output power of the photovoltaic panel.

The DC-DC main converter includes an interleaved power factor circuit and an adjustable inverter power supply circuit; the high-voltage pulse generating unit includes a power switch circuit, an energy recovery circuit and a high-voltage pulse forming circuit; the power output parameter control unit , including an output voltage adjustment circuit, a pulse repetition rate adjustment circuit and a pulse width adjustment circuit; the interleaved power factor circuit receives the voltage of the filter and rectification unit, outputs a constant high voltage, and supplies power to the adjustable inverter power supply circuit, and the adjustable inverter The variable power supply circuit supplies power to the power switch and energy recovery circuit in the high-voltage pulse generating unit, and the power switch and energy recovery circuit work together with the high-voltage pulse forming circuit under the control of the drive and protection unit to generate high-voltage pulse output; The output voltage adjustment circuit in the power output parameter control unit sends an output voltage adjustment signal to the adjustable inverter power supply unit of the DC-DC main inverter, so that the DC-DC main converter provides an adjustable output voltage to the high-voltage pulse generating unit; The pulse repetition rate adjustment circuit and the pulse width adjustment circuit in the power output parameter control unit control the driving and protection unit to control the high voltage pulse forming circuit in the high voltage pulse generating unit to output adjustable high voltage pulse signals.

The drive and protection unit includes a power switch drive circuit and an overload protection circuit, and the power switch drive circuit is used to drive and control the high-voltage pulse generating unit to output an adjustable high-voltage pulse signal.

As shown in Figure 7, the power factor correction unit includes a controller UP1, power factor inductors L3-L4, rectifier diodes D1-D2 and power switch tubes Q1-Q2, the switch drive signal output terminals DRV1 and The signal of DRV2 is reversed and forms an interleaving drive with the power switch tubes Q1 and Q2, so that the current in the power factor inductor L3-L4 is in an interleaving state; the output terminals ZCD1 and ZCD2 of the controller UP1 respectively pass through the power factor inductors L3-L4, The rectifier diodes D1-D2 serve as the output terminal VH2 of the power factor correction unit, and the voltage of the output terminal VH2 of the power factor correction unit feeds back the output voltage to the FB terminal of the controller UP1 through a feedback circuit formed by resistors R5 and R7.

The signals of the switch drive signal output terminals DRV1 and DRV2 of the controller UP1 are inversely phased to form an interleaved drive for the power switch tubes Q1 and Q2, so that the current in the power factor inductor L3-L4 is in an interleaved state, which effectively improves the working efficiency of the circuit. Electromagnetic interference of low circuit operation, ZCD1 and ZCD2 of controller IP1 are the current detection terminals of power factor inductors L3-L4 respectively; Bo terminal is used for input voltage tracking detection; FB terminal is used for output voltage feedback; OVp terminal is used for detection Whether the output terminal voltage is overvoltage; CS1 and CS2 terminals are used to detect the current of the switch tubes Q1 and Q2; the voltage of the output terminal VH2 of the interleaved PFC circuit (DC420V±20V) is sent to the control through the feedback network composed of resistors R5 and R7 The output voltage is fed back from the FB terminal of the controller, and at the same time, the feedback network composed of resistors R6 and R8 feeds back whether VH2 is overvoltage to the OVp terminal of the controller UP1. The maximum continuous output power is 1.6KW. The controller UP1U uses FAN9612, NCP1631 chips, etc.

The relevant parameters of the power factor correction unit are given by the formula and Determine, where P _sto represents the stored energy of the inductor L, P _out is the output power of the V _out terminal, I _av is the peak current of the inductor L, D _max is the maximum duty cycle of the controller output switching signal, η is the conversion efficiency, f _op is the operating frequency of the controller, and the function of the output capacitor C2 is to store energy and maintain a constant voltage. The capacitance selection of this circuit is mainly to control the output ripple within the range specified by the index. For the interleaved power factor correction circuit, the impedance of the capacitor and the output current determine the size of the output voltage ripple. The impedance of the capacitor consists of three parts, namely, the equivalent series inductance (ESL), the equivalent series resistance (ESR) and the capacitance value (C). In the continuous mode of the inductor current, the size of the capacitor depends on the output current, switching frequency and desired output ripple. When the MOS tube is turned on, the output filter capacitor provides the entire load current. In this circuit, in order to meet the desired output ripple voltage, the capacitor value can be selected as follows

${\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Greater\; Equal;</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&Delta;V</span>}}$

Among them, I _omax is the maximum output current; D _max is the maximum duty ratio; f _s is the switching frequency; ΔV is the ripple voltage.

As shown in Figure 8, the adjustable inverter power circuit includes a power controller UP2, AND gates U1A-U1D, drive integrated circuits UD1-UD2, full-bridge inverter switch tubes QD1-QD4, the power controller UP2 The output ends of the drive integrated circuits UD1 and UD2 are respectively connected to the drive integrated circuits UD1 and UD2 through the AND gates U1A-U1B and the AND gates U1C-U1D, and the output ends of the drive integrated circuits UD1-UD2 drive the full-bridge inverter switch tubes QD1-QD4, so The output terminals of the switch tubes QD1-QD4 of the full-bridge inverter output the voltage AHV through the high-voltage transformer T, wherein the power controller UP2 adopts integrated circuits such as LTC3722, UCC28950, UCC3895, and ISL6752; UUD1 and UD2 are full-bridge inverter switches The driving integrated circuits of tubes QD1-QD4 adopt integrated circuits such as IR2186 and IR2110; QD1-QD4 are IGBT power switch tubes, which need to have a high voltage resistance of 650V and a current capacity greater than 30A; DF1-DF4 are freewheeling diodes, which use ultra-fast recovery Diode; T is a high-frequency power conversion transformer; DB1 and DB2 are high-voltage ultra-fast recovery rectifier diodes (such as ST's STTH6112TV with a reverse withstand voltage of 1200V, a current of 20A, and a reverse recovery time of 45ns); CH3 and CH4 are high frequency capacitor, its role is to filter and store energy; during the circuit operation, the capacitor CS and the primary inductance of the voltage transformer T form a series resonant circuit, and the switching tubes QD1-QD4 of the full-bridge inverter are in the zero-voltage switching state; the output parameters of the control Under the adjustment of the unit, the output voltage AHV of the adjustable inverter power supply can be adjusted between DC100-600V. When the main inverter circuit is over-current or the output is over-voltage, the SD terminal shown in Figure 11 outputs a low level, and the controller UP2 stops outputting , the output signals of the AND gates U1A-U1D are blocked (low level). At this time, the switching tubes QD1-QD4 of the full-bridge inverter are forced to close, so that the circuit enters a protection state.

As shown in Figure 9, the power output parameter control unit includes a microcontroller UC, an optocoupler U2, a voltage comparator A1-A2, a high-speed Schmitt trigger U5A and a digital potentiometer Radj, the digital potentiometer The input terminal of Radj is connected with light touch switches K1 and K2 for changing its value, the output terminal is connected with the negative terminal of the voltage comparator A2, the positive terminal of the voltage comparator A1 is connected with an external reference voltage, and the negative terminal of the voltage comparator A1 The output voltage AHV of the adjustable inverter power supply circuit is externally connected to the terminal, and the output terminal of the voltage comparator A1-A2 is connected with the power controller UP2 of the adjustable inverter power supply circuit through the photocoupler U2; The switches KS, K3, K4, K5, and K6 are respectively connected to the input and output ports of the microcontroller UC, and the microcontroller UC is controlled to output the pulse repetition rate adjustment signal, the pulse width adjustment signal and the drive signal for the power switch drive circuit to be sent to Drive and protection unit, among them, microcontroller UC adopts STC15F101E/104W of STC Company or PIC12F629/675 of Microchip Company, digital potentiometer Radj, selects digital potentiometer AD5228 with 32 sliding port positions of increase/decrease interface.

As shown in Figure 10, the power switch driving circuit includes high-speed voltage comparators A3-A6, high-speed Schmitt trigger U5B, high-speed NAND gates U4A and U4B, MOS transistors QA1 and QA2, and the power output parameter control unit outputs The drive signal of the power switch drive circuit passes through the power switch drive circuit composed of high-speed Schmitt triggers U5B, U4A, U4B and QA1, QA2 in sequence, wherein the MOS tube QA1 is a PMOSFET tube ZVP2106G, and the MOS tube QA2 is an NMOSFET tube ZVN2106G; The overload protection circuit includes voltage comparators A3, A4 and transistor Q3 to form an overcurrent protection delay circuit for protecting the adjustable inverter power supply circuit shown in Fig. 3, and the protection delay parameters are determined by the parameters of R12 and C6. The function of the capacitor C5 is to ensure that a voltage greater than Vref is provided to the non-inverting terminal of the voltage comparator A4 at the moment of power-on, so as to ensure that the output of SD2 is at a high level. The function of diode D5 is to quickly release the charge stored in C6 at the moment of power failure; the overload protection circuit also includes voltage comparators A5, A6 and transistor Q4, which constitute the overcurrent protection delay circuit of the high voltage pulse generating unit, control diagram 11 When the current of the power electronic switches QT1 and QT2 of the high-voltage pulse generating unit exceeds the maximum limit set by the reference voltage Vref2 and the resistors R23 and R24, the voltage comparator A5 outputs a high level, triggering the R26, D6, C10, C11, Q4 In the protection delay circuit formed with A6, the SD2 end outputs a low level, so that QA1 and QA2 are cut off, DOT outputs a low level, and the high-voltage pulse generating unit shown in Figure 11 stops working.

QT1 and QT2 of the high-voltage pulse generating unit are high-speed power field effect transistors, and their source-drain withstand voltage needs to meet 800-1000V, using SiHFPE50, SiHFPF50, SiHFPG50 and IPW90R120C3 and other devices; pulse power transformer PT1-PT10, the magnetic core The material uses high-frequency power ferrite magnetic rings, such as PC45, PC46, PC47, PC50, PC90, PC95, etc., and its windings use high-voltage insulated wires; the magnetic materials of compression switches MSA and MSB, MS1 and MS2 use B-H curves with rectangular characteristics , and moment magnetic materials with small coercive force, such as iron cobalt vanadium moment magnet, Orthonol (Orthonol) moment magnet, amorphous 2605SC and amorphous 2714SC, etc.; capacitors Cc1, Cc2, Cp1, Cp2, C0 , C1 and C2 use high-frequency high-voltage mica capacitors, which are required to have a small equivalent series impedance and inductance; diode DD1 is a high-voltage switching diode, using 25 2CL106 to form a 5-string 5-parallel structure (or 20 2CL2FM to form 2 strings 20 Parallel, or 60 BYX104Gs form 5 strings and 12 parallel structures).

The primary parallel connection of the pulse power transformer PT1-PT10, and the secondary series connection, in order to obtain greater energy, divide the 10 pulse transformers into two groups (each group of 5), which are driven by power electronic switches QT1 and QT2 respectively. The secondary compression switches MSA and MSAB are connected in series at the primary stage of each group of power pulse transformers.

At the moment when the power electronic switches QT1 and QT2 are turned on, the current flows from the AHV terminal to the ground wire through the inductors Lc1, Lc2, diodes Dp1, Dp2 and current sampling resistors Rrs1, Rrs12. At the same time, due to the coupling effect of the capacitors Cp1 and Cp2, there is another current From the ground wire through the magnetic switch MSA (B), the primary coil of the pulse transformer PT1-PT10, through the capacitors Cp1, Cp2 to flow to the ground wire to form a loop. At this time, under the coupling of the pulse transformer PT1-PT10, there are three other current loops, that is, the current loop of "ground wire → DD1 → MS2 → MS1 → C1 → pulse transformer secondary series winding", and the "ground wire →C2→MS1→C1→pulse transformer secondary series winding" current loop, "ground wire → C0→pulse transformer secondary series winding" current loop, in which, the compression switches MSA, MSAB and the current of MS1 and MS2 The magnetic core of the magnetic switch can be reset, that is, in each pulse repetition period, the magnetic reset function is automatically realized at the moment when the power switch tube is turned on.

At the moment when the power electronic switches QT1 and QT2 are turned off, according to Lenz’s law, the current will continue to flow from the AHV terminal through Lc1, Lc2, diodes Dp1, Dp2 to generate a self-induced electromotive force, which is connected to the voltage of the AHV terminal through the coupling capacitors Cp1 and Cp2 Loaded on both ends of the series circuit composed of the primary coil of the pulse transformer PT1-PT10 and the compression switch MSA, MSAB, the maximum voltage _Vc applied is determined by the parameters of the lossless snubber circuit, as it flows through the primary coil of the pulse transformer and the compression switch MSA, The current of MSB is continuously increasing. When the compression switches MSA and MSB are saturated, almost all high-voltage signals are loaded on the primary side of the pulse transformer. At this time, the superimposed pulse high voltage is obtained on the secondary side of the pulse transformer. Obtain the coupled pulse voltage.

The expression of the maximum voltage _Vc applied to the primary of the pulse transformer is:

V _c ＝V _AHV +V _L +V _F ≈V _AHV +V _L

In the formula, V _AHV is the voltage at the AHV terminal, V _L is the self-induction electromotive force of the inductor Lc1(2), and V _F is the forward voltage drop of the diodes Dc1 and Dc2.

Constraints between the winding peak currents of inductors Lc1 and Lc2, the peak magnetic flux density B _PK of the magnetic core material and the maximum magnetic flux density B _m : B _PK = χB _m , 0.4≤χ≤0.8,

l _e is the length of the magnetic path of the two magnetic cores, N represents the number of winding turns wound on the magnetic core, Δi is the current conversion rate through the winding, and the magnetic field strength is obtained

If the leakage inductance of the air gap δ is small enough (less than 10%), the following electromagnetic expression holds true:

$\mathrm{\&Delta;H}=\frac{\mathrm{\&Delta;B}}{{\mathrm{\&mu;}}_i}=\frac{\mathrm{N\&Delta;i}}{l_e+\mathrm{\&delta;}}$ and $\mathrm{\&Delta;B}=\frac{{\mathrm{\&mu;}}_0\mathrm{N\&Delta;i}}{\frac{l_e}{{\mathrm{\&mu;}}_r}+\mathrm{\&delta;}}$

In the formula, μ ₀ =4π×10 ^-7 , is the relative permeability of the core material, l _e is the effective magnetic path length of the core, and δ is the air gap length. In practical applications, according to the winding peak current, the peak magnetic flux density B _PK of the magnetic core material and the maximum magnetic flux density The constraint relationship between B _m should also satisfy:

${\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; N</span>}{\mathrm{<span\; class="notranslate">\; i</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}}{\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; \&chi;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}$

According to Maxwell's equation and Faraday's electromagnetic induction principle, the cross-sectional area of the magnetic core is S, and the expression of the changing magnetic field caused by the primary coil current i caused by the inductance of N is determined as:

${\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; NS</span>}\frac{\mathrm{<span\; class="notranslate">\; dB</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; L</span>}\frac{\mathrm{<span\; class="notranslate">\; di</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}$

That is, when the winding passes the current Δi, the rate of change of the magnetic induction of the inductance is Then it can be known that the calculation expression of the inductance Lc2 is:

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; NS</span>}\frac{\mathrm{<span\; class="notranslate">\; \&Delta;B</span>}}{\mathrm{<span\; class="notranslate">\; \&Delta;i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; N</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S</span>}\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; NS</span>}\frac{\mathrm{<span\; class="notranslate">\; \&chi;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{{\mathrm{<span\; class="notranslate">\; i</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}}$

The inductance is proportional to the square of the number of turns of the coil and the cross-sectional area of the magnetic core, and inversely proportional to the effective magnetic circuit length and the air gap length. (Cross-sectional area S, effective magnetic path length l _e , magnetic permeability μ _r , maximum saturation magnetic flux density B _m ), the constraint relationship among winding turns N, air gap δ and inductor peak current i _PK .

Within the maximum pulse repetition period T _rep. , define the current rise and fall times in the inductors Lc1 and Lc2 to be equal t _r =t _f , according to the magnetic induction intensity formula with air gap, the peak magnetic flux density B _PK of the core material and the maximum magnetic flux density The constraint relation between the flux density B _m can obtain the expression of the maximum current variation:

${\mathrm{<span\; class="notranslate">\; i</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; PK</span>}}\frac{\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&chi;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}\frac{\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; N</span>}}$

Define V _L =V _AHV , then the inductance equation and the volt-second law of inductance can obtain the expressions of the current rise and fall times of the inductors Lc1 and Lc2 working at the maximum saturation magnetic flux density within a conduction cycle:

${\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}{\mathrm{<span\; class="notranslate">\; \&Delta;i</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; AHV</span>}}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S\&chi;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; AHV</span>}}}$

Then the maximum pulse repetition frequency f _rep. and the minimum pulse repetition period T _rep. must satisfy the following formula:

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; rep</span>}<span\; class="notranslate">\; .</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; rep</span>}<span\; class="notranslate">\; .</span>}}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; AHV</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; N</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S\&chi;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}$

T _rep. is set by the microcontroller UC in the power output parameter control unit shown in FIG. 4 .

In summary, the high-voltage pulse power supply with adjustable discharge parameters of the present invention is provided with voltage and current detection circuits at the input and output terminals, which can effectively obtain the input power of the high-voltage power supply system and the discharge power at the output terminal, and effectively judge whether the high-voltage pulse power supply is running Normal, can also realize the discharge power of the output terminal, adjust the voltage and pulse parameters of the output terminal of the power supply, greatly improve the applicable occasions of high-voltage pulse power supply, can be widely used in the field of water treatment systems, adjust the velocity of the water mist jet, and have a good application prospect .

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. null1. the high-voltage pulse power source of an adjustable discharge parameter，It is characterized in that: include power supply unit、Filtering and rectification unit、Accessory power supply、DC-DC main converter、High-voltage pulse generating unit、Drive and protected location and power supply output parameter control unit，Said supply unit is connected with the input of filtering and rectification unit，The output of described filtering and rectification unit is connected with accessory power supply and DC-DC main converter respectively，Described DC-DC main converter the most respectively with high-voltage pulse generating unit、Power supply output parameter control unit is connected，Described power supply output parameter control unit is connected with high-voltage pulse generating unit with protected location also by driving，Described accessory power supply is provided with the output of multiplex operation power supply，It is respectively DC-DC main converter、High-voltage pulse generating unit、Drive and power with protected location and power supply output parameter control unit；

   Said supply unit includes photovoltaic module, carrying out surge protection unit, grid-connected photovoltaic inverter, off-network photovoltaic DC-to-AC converter with energy storage and channel to channel adapter, the electric energy output end of described photovoltaic module is connected with the off-network photovoltaic DC-to-AC converter of band energy storage and the electrical energy inputs of grid-connected photovoltaic inverter respectively by carrying out surge protection unit, the off-network photovoltaic DC-to-AC converter of described band energy storage is connected with the input of channel to channel adapter respectively with the electric energy output end of grid-connected photovoltaic inverter, the input of described channel to channel adapter is also connected with civil power, the output of described channel to channel adapter is connected with filtering and rectification unit as the output of power supply unit；

   nullDescribed photovoltaic module is provided with the photovoltaic of MPPT maximum power point tracking control can gather charhing unit，Described photovoltaic can gather charhing unit and include photovoltaic panel PV、Photovoltaic output current sampling circuit CS1、Main converter Buck、Charge current sample circuit CS2、Battery B、MCU、Voltage and current feedback control network，Described photovoltaic panel PV is connected by photovoltaic output current sampling circuit CS1 with MCU，Described battery B is connected by charge current sample circuit CS2 with MCU，It is provided with main converter Buck between described photovoltaic output current sampling circuit CS1 and charge current sample circuit CS2，It is provided with voltage and current feedback control network between described main converter Buck and charge current sample circuit CS2，Described voltage and current feedback control network is also connected with MCU；

   Described driving and protected location, including power switch driver circuit and overload protecting circuit, described power switch driver circuit is used for driving control high-voltage pulse generating unit to export adjustable high-voltage pulse signal；

   Described power supply output parameter control unit, including microcontroller UC, photoelectrical coupler U2, voltage comparator A1-A2, high-speed schmitt trigger U5A and digital regulation resistance Radj, the input of described digital regulation resistance Radj connects touch-switch K1 and K2 for changing its value, output is connected with the backward end of voltage comparator A2, the external reference voltage of forward end of voltage comparator A1, the output voltage AHV of the external adjustable inverter power circuit of backward end of voltage comparator A1, the output of described voltage comparator A1-A2 is connected with the power-supply controller of electric UP2 of adjustable inverter power circuit by photoelectrical coupler U2；Touch-switch KS, K3, K4, K5, K6 input/output port with microcontroller UC respectively is connected, and controls that microcontroller UC output pulse recurrence rate adjusts signal, pulse width adjusts signal and the driving signal for power switch driver circuit is sent to drive and protected location；

   Described power switch driver circuit includes high speed voltage comparator A3-A6, high-speed schmitt trigger U5B, high speed NAND gate U4A and U4B, metal-oxide-semiconductor QA1 and QA2, the driving signal for power switch driver circuit of power supply output parameter control unit output passes sequentially through high-speed schmitt trigger U5B, U4A, U4B and QA1, QA2, the power switch driver circuit that high-speed schmitt trigger U5B, U4A, U4B and QA1, QA2 are constituted；Described overload protecting circuit includes voltage comparator A3, A4 and triode Q3, constitutes the overcurrent protection delay circuit of adjustable inverter power circuit；Described overload protecting circuit also includes voltage comparator A5, A6 and triode Q4, constitutes the overcurrent protection delay circuit of high-voltage pulse generating unit.
2. The high-voltage pulse power source of adjustable discharge parameter the most according to claim 1, it is characterised in that: described DC-DC main converter includes intertexture type power factor (PF) circuit and adjustable inverter power circuit；Described high-voltage pulse generating unit, including power switch circuit and energy recovering circuit and high-voltage pulse formation circuit；Described power supply output parameter control unit, adjusts circuit, pulse recurrence rate adjustment circuit and pulse width adjusting circuit including output voltage；Described intertexture type power factor (PF) circuit accepts filter and the voltage of rectification unit; output constant high-pressure; and power to adjustable inverter power circuit; adjustable inverter power circuit is powered to the power switch in high-voltage pulse generating unit and energy recovering circuit; described power switch and energy recovering circuit are under driving the control with protected location; jointly act on high-voltage pulse formation circuit, produce high-voltage pulse output；Output voltage in described power supply output parameter control unit adjusts circuit and sends output voltage adjustment signal to the adjustable inverter unit of DC-DC main inverter, and the output voltage making DC-DC main converter provide to high-voltage pulse generating unit is adjustable；Pulse recurrence rate in described power supply output parameter control unit adjusts circuit, pulse width adjusting circuit controls to drive the high-voltage pulse formation circuit with in protected location control high-voltage pulse generating unit to export adjustable high-voltage pulse signal.
3. The high-voltage pulse power source of adjustable discharge parameter the most according to claim 2, it is characterized in that: described intertexture type power factor (PF) circuit includes controller UP1, power factor inductance L3-L4, commutation diode D1-D2 and power switch pipe Q1-Q2, the signal inversion of switching drive signal output DRV1 and DRV2 of described controller UP1, formed to interweave with power switch pipe Q1, Q2 and drive so that power factor inductance L3- Electric current in L4 is in intertexture variable condition；Output ZCD1 and ZCD2 of controller UP1 passes through power factor inductance L3-L4, the commutation diode D1-D2 output VH2 as intertexture type power factor (PF) circuit respectively, and the voltage of the output VH2 of intertexture type power factor (PF) circuit passes through the feedback circuit of resistance R5 and R7 composition to the FB end fed-back output voltage of controller UP1.
4. The high-voltage pulse power source of adjustable discharge parameter the most according to claim 2, it is characterized in that: described adjustable inverter power circuit includes power-supply controller of electric UP2, with door U1A-U1D, drive integrated circult UD1-UD2, full-bridge inverter switching tube QD1-QD4, the output of described power-supply controller of electric UP2 respectively by with door U1A-U1B and with door U1C-U1D and drive integrated circult UD1, UD2 is connected, the output of described drive integrated circult UD1-UD2 drives full-bridge inverter switching tube QD1-QD4, the output of described full-bridge inverter switching tube QD1-QD4 passes through high-tension transformer T output voltage AHV.