CN206283424U - A kind of Novel DC voltage source - Google Patents

Abstract

A kind of Novel DC voltage source.It is main by Industrial Frequency Transformer, rectifier bridge, capacitor, inverter circuit, high frequency transformer, voltage doubling rectifing circuit, divider, PWM generation modules, drive module composition.When power work, single-phase 220V alternating currents are 24V alternating currents through transformer pressure-reducing.Can not be changed into direct current by capacitor after control rectifying circuit through single-phase full bridge, DC voltage is raised to 34V.By inverter circuit, and high frequency transformer, voltage is changed into high frequency square wave.By voltage doubling rectifing circuit, by voltage output to 500V to 2000V.The power supply is usually used in the measurement of polarization depolarization current and return voltage.

Description

A kind of Novel DC voltage source

Technical field

The utility model is applied in terms of the measurement of polarization depolarization current and return voltage method, is especially run in equipment Scene, the equipment has portability and practical security.

Background technology

In high-voltage test, because the volume of high voltage power supply is big, voltage-regulation is inconvenient, and plus voltage after load There is certain decline compared with when zero load, it is difficult to meet the unification of portability and accuracy.

The content of the invention

It is big in order to solve the volume of high-voltage test electric power in the utility model, with the problem that voltage accuracy after carrying is reduced, enter And propose a kind of Novel DC voltage source.

The utility model is that the taken technical scheme that solves the above problems is：A kind of Novel DC voltage source, it is special It can be the DC voltage for producing 500V-2000V to levy, and its precision can be ensured after taking load, mainly includes 4 parts, one is Step-down rectifier module, is made up of step-down transformer and single-phase full bridge rectification circuit, and step-down transformer reduces power-frequency voltage, single-phase Power-frequency voltage after step-down is converted into DC voltage by full bridge rectifier, the second is inversion times frequency module, is made up of MOSFET Inverter circuit, Support Capacitor and high frequency transformer constituted, and DC voltage is changed and struck a bargain by the inverter circuit of MOSFET compositions The amplitude and frequency of ac square wave are entered line translation by stream square wave, the spike in Support Capacitor absorbing circuit, high frequency transformer, Part III tandem DC generating circuit, and divider composition, the height that tandem DC generating circuit exports high frequency transformer Frequency square wave conversion high direct voltage output, the voltage that divider is got produces the pin of chip to be connected with PWM, can be according to partial pressure Device gets the dutycycle that voltage levels change output pwm signal, carries out PI regulations, so that voltage keeps permanent when plus load Fixed, circuit occurs by PWM for Part IV and drive circuit is constituted, and PWM occurs circuit and produces pwm signal, and drive circuit is to PWM Signal carries out isolation amplification, drives the MOSFET in inverter circuit, thus constitutes a complete Novel DC voltage source.

The beneficial effects of the utility model are：MOSFET in the utility model main circuit supports the wide of power supply output frequency Range regulation, easily can match with various high frequency transformers, and driving circuit structure is simple, can simplify high pressure examination The design in electrical verification source, and its volume and weight are substantially reduced, with low cost, the advantage of small volume, by ac-dc-ac transform Industrial-frequency alternating current afterwards is boosted after being converted into high-frequency ac electricity output, and examination can be substantially reduced under conditions of power frequency equivalent capability The volume of the magnetic element such as step-up transformer in electrical verification source, so as to realize that power supply is minimized, the purpose of good portability.

Brief description of the drawings

Fig. 1 is structured flowchart of the present utility model；Fig. 2 is topological diagram of the present utility model；Fig. 3 is of the present utility model PWM generative circuit figures；Fig. 4 is drive circuit figure of the present utility model.

Specific embodiment：

Figure is that can understand the technical characterstic for illustrating this programme, below by specific embodiment, and its accompanying drawing is combined, to this Utility model is described in detail, and 220V is changed into ~ 24V through transformer T1, by by diode D1, D2, D3, it is whole that D4 is constituted Stream bridge, the output of rectification is connected elimination ripple with electrochemical capacitor C1, and the DC voltage after rectification is raised into 34V, electrolysis electricity Hold two ends DC voltage to pass through by MOSFETQ1, the H-bridge inverter circuit of Q2, Q3, Q4 composition, the parallel electrolytic between two bridge arms Electric capacity C2 eliminates spike with this, and the output of inverter circuit is connected to the input side of high frequency transformer T2.

The negative pole of the high pressure termination high-voltage capacitance C3 of the outlet side of high frequency transformer T2, the low-pressure end ground connection of T2, and with The negative pole of electric capacity C4 is connected with the positive level of diode D5, and the negative pole of D5 is connected with the positive pole of high-voltage capacitance C3, and diode D6 is just Pole is connected with the negative pole of diode D5, and the negative pole of D6 is connected with the positive pole of electric capacity C4, the negative pole of electric capacity C5 and the positive pole of electric capacity C3 It is connected, the positive pole of electric capacity C5 is connected with the positive pole of diode D8, and the negative pole of diode D8 is connected with the positive pole of electric capacity C6, electric capacity C6 Negative pole be connected with the positive pole of diode D6 and the positive pole of diode D7, the negative pole of D7 and the positive pole of electric capacity C5 and diode D8 Positive pole and the negative pole of electric capacity C7 be connected, the positive pole of C7 is connected with the positive pole of diode D10, the negative pole of D10 and electric capacity C8's Positive pole is connected, and the negative pole of C8 is connected with the positive pole of the negative pole of diode D8 and diode D9, and the negative pole of D9 is with electric capacity C7 just The positive pole of pole and diode D10 is connected, one end of the positive pole connection resistance R1 of electric capacity C8, the other end connection resistance of resistance R1 One end of R2, the other end ground connection of R2.

SG3525 is the integrated PWM Controller of the use voltage mode control of SGS-Thomson companies production, and 1 pin connects electricity One end of R3 is hindered, R3 is another to terminate at one end that resistance R2 is connected with resistance R1, to carry out PI regulations, one end of 2 pin and resistance R4 is connected, and the other end of R4 is connected with divider, and 3,4 pin are hanging, and 5 pin are connected with electric capacity C9, another termination of electric capacity Ground, 6 pin are connected with resistance R5, and the other end ground connection of R5,7 pin are connected with resistance R6, and the other end of resistance is connected with 5 pin, and 8 Pin is connected with electric capacity C10, the other end ground connection of electric capacity, 10 pin ground connection, 11 pin connecting resistance R7, and the resistance other end is with IR2110's 10 pin are connected, and 12 pin ground connection, 13 pin connect 15V constant pressure sources, 14 pin connecting resistance R8, the other end of resistance and the 12 pin phases of IR2110 Even, 15 pin connect 15V power supplys, and 16 pin connect 5.1V power supplys.

IR2110 is the half-bridge MOSFET/IGBT driving chips of IR companies of U.S. production, using Bootstrap technology, is had High integration, can realize the potential isolation of control and driving side, reduced by the power supply number for reducing drive circuit and drive electricity The volume and cost on road, the bridge inverter main circuit in present embodiment, its structure is：The circuit is by four bridge arms and filtering Electric capacity is constituted, and four bridge arms connect half-bridge driven electricity by 4 MOSFET of same model, Q1, Q2, Q3, Q4 composition, the grid of Q1 The anode of Lu Yizhong diodes DD2, the source electrode of Q1 meets suspension ground B1floatgnd, and the grid of Q2 meets half-bridge drive circuit IR2110 The anode of the diode DD3 in, the source ground of Q2, the grid of Q3 connects the anode of the diode DD3 in IR2110 bis-, Q4's The drain electrode of source ground, Q1 and Q3 is connected, and external dc voltage is applied between drain electrode and the ground of Q1 and Q3, suspends ground B1floatgnd, B2floatgnd are alternating voltage output node.

Implementation above is only that preferred embodiment of the present utility model is described, not to of the present utility model Scope is defined, and on the premise of the utility model design spirit is not departed from, this area ordinary skill technical staff is to this reality The various modifications made with new technical scheme and improvement, all should fall into the protection that claims of the present utility model determine Scope.

Claims (1)

1. a kind of Novel DC voltage source, it is characterized in that producing the DC voltage device of 500V-2000V, and can be adjusted with oneself Section;Mainly include 4 parts:One is step-down rectifier module, is made up of step-down transformer and single-phase full bridge rectification circuit, step-down becomes Depressor reduces power-frequency voltage, and the power-frequency voltage after step-down is converted into DC voltage by single-phase full bridge rectification circuit;The second is inverse Zoom frequency module, the H-bridge inverter circuit being made up of MOSFET, electric capacity and high frequency transformer are constituted, and the H bridges of MOSFET compositions are inverse Become circuit and DC voltage is converted into ac square wave, the spike in capacitive absorption circuit, high frequency transformer is by ac square wave Amplitude and frequency enter line translation;Part III tandem DC generating circuit, and divider composition, tandem DC generating circuit There is chip with PWM in the high frequency square wave conversion high direct voltage output that high frequency transformer is exported, the voltage that divider is got Pin is connected, and the dutycycle of output pwm signal can be changed according to output voltage height, PI regulations is carried out, to add Voltages keep constant during load;Chip occurs by PWM for Part IV and driving chip is constituted, and PWM occurs chip and produces PWM letters Number, driving chip carries out isolation amplification to pwm signal, drives the MOSFET in inverter circuit, thus constitutes one completely Novel DC voltage source, concrete structure connected mode：~ 220V is changed into ~ 24V through step-down transformer T1, by by diode D1, The rectifier bridge of D2, D3, D4 composition, the output of rectification is connected with electrochemical capacitor C1 and eliminates ripple, and by the DC voltage after rectification 34V is raised to, electrochemical capacitor two ends DC voltage passes through by MOSFETQ1, the H-bridge inverter circuit of Q2, Q3, Q4 composition, at two Parallel electrolytic electric capacity C2 eliminates spike with this between bridge arm, and the output of inverter circuit is connected to the defeated of high frequency transformer T2 Enter side, the negative pole of the high pressure termination high-voltage capacitance C3 of the outlet side of high frequency transformer T2, the low-pressure end of high frequency transformer T2 is grounded, And with the negative pole of electric capacity C4, the positive level of diode D5 is connected, and the negative pole of diode D5 is connected with the positive pole of electric capacity C3, diode The positive pole of D6 is connected with the negative pole of diode D5, and the negative pole of diode D6 is connected with the positive pole of electric capacity C4, the negative pole of electric capacity C5 with The positive pole of electric capacity C3 is connected, and the positive pole of electric capacity C5 is connected with the positive pole of diode D8, and the negative pole of diode D8 is with electric capacity C6 just Extremely it is connected, the negative pole of electric capacity C6 is connected with the positive pole of the positive pole of diode D6 and diode D7, negative pole and the electricity of diode D7 Hold the positive pole of C5, the positive pole of diode D8 and the negative pole of electric capacity C7 are connected, the positive pole of electric capacity C7 and the positive pole phase of diode D10 Even, the negative pole of diode D10 is connected with the positive pole of electric capacity C8, the negative pole of electric capacity C8 and the negative pole of diode D8 and diode D9 Positive pole be connected, the negative pole of diode D9 is connected with the positive pole of the positive pole of electric capacity C7 and diode D10, the positive pole of electric capacity C8 company One end of connecting resistance R1, one end of the other end connection resistance R2 of resistance R1, the other end ground connection of resistance R2, SG3525 is SGS- The integrated PWM Controller of the use voltage mode control of Thomson companies production, one end of 1 pin connecting resistance R3, resistance R3 is another One end is connected on one end that resistance R2 is connected with resistance R1, and to carry out PI regulations, one end of 2 pin is connected with resistance R4, resistance R4 The other end be connected with divider；3rd, 4 pin are hanging, and 5 pin are connected with electric capacity C9, the other end ground connection of electric capacity C9,6 pin with it is electric Resistance R5 is connected, and the other end of resistance R5 ground connection, 7 pin are connected with resistance R6, and the other end of resistance R6 is connected with 5 pin, 8 pin and Electric capacity C10 is connected, the other end of electric capacity C10 ground connection, 10 pin ground connection, 11 pin connecting resistance R7, the resistance R7 other ends and IR2110 10 pin of chip are connected, 12 pin ground connection, and 13 pin connect 15V constant pressure sources, the other end and the IR2110 cores of 14 pin connecting resistance R8, resistance R8 12 pin of piece are connected, and 15 pin connect 15V power supplys, and 16 pin connect 5.1V power supplys, the bridge inverter main circuit in present embodiment, its structure It is made up of four bridge arms and filter capacitor, four bridge arms are by 4 MOSFETQ1 of same model, Q2, Q3, Q4 composition；The grid of Q1 Pole connects the anode of diode DD2 in half-bridge drive circuit one, and the source electrode of Q1 meets suspension ground B1floatgnd, and the grid of Q2 connects half-bridge The anode of the diode DD3 in driving chip IR2110 mono-, the source ground of Q2, the grid of Q3 connects the diode in IR2110 bis- The anode of DE3, the source ground of Q4, Q1 is connected with the drain electrode of Q3, and external dc voltage is applied to drain electrode and the ground of Q1 and Q3 Between, suspend ground B1floatgnd, and B2floatgnd is alternating voltage output node.