CN102957327A - High voltage direct current power supply module controlled by DPS (data processing system) - Google Patents
High voltage direct current power supply module controlled by DPS (data processing system) Download PDFInfo
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Abstract
The invention provides a high voltage direct current power supply module controlled by DPS (data processing system). The high voltage direct current power supply module comprises a main power circuit and a DSP-based control circuit, wherein the main power circuit comprises an alternating current input unit, an EMC (Electro Magnetic Compatibility) protecting unit, a rectifying and filtering unit, a BUCK converter, a controllable phase-shift full-bridge inverter, a high frequency boost converter, a dual voltage rectifying unit and a filter, and the control circuit comprises a DSP control unit, a partial voltage feedback sampling unit, a DSP auxiliary power supply and a keyboard/display unit. According to the invention, the DSP is used as a control core to guarantee good controllability for the power supply, and the high voltage direct current power supply module is easy to upgrade and maintain. A DSP chip is used for realizing all-digital control on the main circuit of the power supply, and the output voltage is adjustable at a fixed point, so that the precision and stability of the output voltage are improved.
Description
Technical field
The present invention relates to a kind of PWM type high voltage direct current source module of high voltage direct current source module, particularly a kind of DSP-based control.
Background technology
Along with the development of power electronic technology and switching device, such as the guidance of new theory, new technology, the progress of new unit, new material and intellectuality of control etc., switch power technology has been widely used in the high voltage direct current source technology.Utilize the switch power technology generation than square wave or the sinusoidal wave volume and weight that can greatly reduce high voltage source of the high thousands of overtones bands of power frequency, this is the important development trend of high-voltage DC power supply.
Existing power supply extensively adopts TL494, the power source special chips such as UC3875 come the driving switch pipe, specific power supply chip itself is non-programmable, controllability is relatively poor, be difficult to expansion, be difficult for upgrade and repair, power supply chip is the analogue type chip simultaneously, have being floated and the caused error that wears out by temperature that analog circuit is difficult to overcome, the system that can't guarantee has high accuracy and reliability all the time.
Summary of the invention
For the shortcoming of present technology, the invention provides a kind of high voltage direct current source module of able to programme, controllability good, expansion is easy, upgrade and repair is convenient, precision and reliability are high DPS control.
Technical scheme of the present invention is as follows:
A kind of high voltage direct current source module of DPS control, comprise power main circuit and control circuit based on DSP: wherein the power main circuit comprises: exchange input, the EMC protected location, rectification filtering unit, the BUCK converter, the controlled inverter of phase-shifting full-bridge, the high frequency booster converter, the voltage multiplying rectifier unit, filter, be connected in series successively by I/O between the unit of power main circuit, AC-input voltage prevents electromagnetic interference through the filtering of EMC protected location, obtain a direct current voltage through rectification filtering unit again, then carry out pressure regulation through the BUCK converter and obtain a level and smooth direct voltage, through the controlled inverter of phase-shifting full-bridge voltage is reverse into an alternating voltage, become high-frequency ac voltage through the high frequency booster converter again, then by the rectification of voltage multiplying rectifier unit and filter filtering, obtain the high-quality that needs, high-quality direct voltage;
Control circuit based on DSP comprises: DSP control unit, voltage dividing potential drop feedback sample unit, DSP accessory power supply and keyboard/display circuit, wherein the input of voltage dividing potential drop feedback sample unit is connected in the DSP control unit and samples, keyboard/display circuit links to each other with the DSP control unit by serial ports, the DSP control unit is controlled output voltage according to the front and back brachium pontis phase difference of the controlled inverter of feedback voltage calculating phase-shifting full-bridge of voltage dividing potential drop feedback sample unit sampling, the DSP accessory power supply provides the power supply of DSP control circuit, and keyboard/display circuit shows the electric current and voltage value.
As preferably, described rectification filtering unit selects MT3516 type three-phase bridge heap to carry out rectification, and filter capacitor is selected capacity 4700PF, withstand voltage for exchanging the safety electric capacity of 400V.
As preferably, described BUCK converter selects the MOSFET of IRFP460 type as the main switch of BUCK circuit, and fly-wheel diode selects reverse recovery time short, has the Schottky diode of soft recovery characteristics.
As preferably, the controlled inverter of described phase-shifting full-bridge adopts phase-shift full bridge parallel resonance structure, and switching device adopts integrated power module, and resonant tank adopts large inductance and the little capacitances in series resonance way of output in parallel, and its resonance frequency is less than switching frequency.
As preferably, described high frequency booster converter adopts two transformers, first order isolation, and boost in the second level, and the high frequency booster converter is sealed in the fuel tank, and the primary and secondary coil turn of first order transformer is the same with the number of primary turns of second level transformer.
As preferably, it is control core that described control circuit based on DSP adopts the TMS320LF2407 dsp chip of TI company, voltage dividing potential drop feedback sample unit adopts voltage and current ring feedback formula to carry out voltage stabilizing control, high side voltage adopts highvoltage resistance potential divider to sample, utilize amplifier to carry out impedance matching, then utilize the linear light lotus root to isolate, last signal enters the A/D conversion of DSP by dividing potential drop filtering.
The invention has the beneficial effects as follows: whole power-supply system is take DSP as control core; concentrate the functions such as protection of the output voltage selection realized phase-shifting full-bridge inversion transformation technique, high-voltage DC power supply and adjusting, whole system with one single chip; make power supply have preferably controllability, and easily upgrading, easy-maintaining.
Adopt dsp chip that electric power main circuit has been realized digital control, it is adjustable that output voltage arranges fixed point, improved precision and the stability of output voltage.Control algolithm, also is convenient to the user and is selected neatly different control functions according to needs separately so that system upgrade is convenient by the software programming realization.
Description of drawings
Fig. 1 is functional-block diagram of the present invention.
Fig. 2 is system clock circuit figure of the present invention.
Fig. 3 is memory interface circuit figure of the present invention.
Fig. 4 is DSP power circuit diagram of the present invention.
Fig. 5 is reset circuit figure of the present invention.
Fig. 6 is the DSP program flow diagram.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the present invention includes following part: power main circuit part and control circuit based on DSP.Wherein the power main circuit comprises: EMC protected location 1, rectification filtering unit 2, BUCK converter 3, the controlled inverter 4 of phase-shifting full-bridge, high frequency booster converter 5, voltage multiplying rectifier unit 6, filter 7.Control circuit based on DSP comprises: DSP control unit 8, voltage dividing potential drop feedback sample unit 9, DSP accessory power supply and keyboard/display circuit 10.Power supply be input as 220V industrial frequency AC civil power; prevent electromagnetic interference through 1 filtering of EMC protected location; behind rectification filtering unit 2 filtering, rectifying and wave-filtering, obtain the direct current about about 300V; then carry out pressure regulation through BUCK converter 3 and obtain a level and smooth direct voltage; requirement according to output voltage; can change by software programming the duty ratio of driving switch pipe pwm signal, to obtain different output voltages.Through the controlled inverter 4 of phase-shifting full-bridge voltage is reverse into an alternating voltage, LCC load resonant phase shift no-voltage full-bridge converter is adopted in the core of converter, realize high frequency, obtain the AC signal of frequency 20kHz, become high-frequency ac voltage through high frequency booster converter 5 again, then by 6 rectifications of voltage multiplying rectifier unit, obtain the high-quality that needs, high-quality direct voltage through filter 7 filtering.DSP control unit 8 is controlled output voltage according to the front and back brachium pontis phase difference of the controlled inverter 3 of feedback voltage calculating phase-shifting full-bridge of voltage dividing potential drop feedback sample unit 9 samplings, DSP accessory power supply 9 provides the power supply of DSP control circuit, and keyboard/display circuit 10 shows the electric current and voltage value.
Rectification filtering unit selects MT3516 type three-phase bridge heap to carry out rectification, and filter capacitor is selected capacity 4700PF, withstand voltage for exchanging the safety electric capacity of 400V.The BUCK converter selects the MOSFET of IRFP460 type as the main switch of BUCK circuit, and this MOSFET pipe has driving easily, does not have secondary-breakdown phenomenon, Heat stability is good, and the safety operation area is large, a series of advantages such as switching speed piece.Fly-wheel diode is selected Schottky diode FR307, and its reverse recovery time is short, has soft recovery characteristics.The controlled inverter of phase-shifting full-bridge adopts phase-shift full bridge parallel resonance structure, and switching device adopts integrated power module, and resonant tank adopts large inductance and the little capacitances in series resonance way of output in parallel, and its resonance frequency is less than switching frequency.This phase shift system can be realized zero voltage switch, zero-voltage and zero-current switch and three kinds of soft starting modes of Zero Current Switch, has effectively prevented the impact of Current on Grid.The high frequency booster converter adopts two transformers, first order isolation, and boost in the second level, and the high frequency booster converter is sealed in the fuel tank, has so both separated high pressure and low pressure, and has carried out effective isolation, so that install and use not only safety but also reliable.The primary and secondary coil turn of first order transformer is the same with the number of primary turns of second level transformer.
It is control core that described control circuit based on DSP adopts the TMS320LF2407 dsp chip of TI company, voltage dividing potential drop feedback sample unit adopts voltage and current ring feedback formula to carry out voltage stabilizing control, high side voltage adopts highvoltage resistance potential divider to sample, utilize amplifier to carry out impedance matching, then utilize the linear light lotus root to isolate, last signal enters the A/D conversion of DSP by dividing potential drop filtering.
Wherein the concrete operating circuit connected mode of DSP is as follows:
1, system clock circuit:
As shown in Figure 2.Adopt packaged crystal oscillator.External clock reference is directly failed people X2/CLKIN pin, and the X1 pin is unsettled, as long as 4 pin of crystal oscillator are connect+5v, 2 pin ground connection just can obtain clock signal at 3 pin.The electric capacity representative value that connects for the bipod crystal oscillator is 20-30pF.
2. memory interface circuit:
The RAM of the FLASH EEPROM of integrated 32K word and 1.5K word among the TMS320LF2407DSP needs the expansion external RAM.Program RAM when from the data RAM of expansion, telling a conduct debugging.Show such as Fig. 3, CY7C1021 is the SRAM of 64K * 16, and the access time minimum is lOns, just can not make system's full speed running therefore do not need to insert latent period.The effect of CY7C1021 mainly is the in-circuit emulation for F2407A, and program code downloads to CY7C1021 during in-circuit emulation.
3. DSP power circuit:
When design DSP power supply, because core power is different from the voltage of port power, need two kinds of Power supplies, so must consider the matching problem between them.In power up, if kernel obtains first power supply, do not powered on every side, at this moment can not produce damage to chip, just there are not input and output, if but peripheral I/0 interface powered first, powered behind the kernel, then might cause DSP and peripheral pin simultaneously as output, if this moment, the value of both sides' output was opposite, two outputs will large electric current may occur because of reverse drive so, thereby affect the life-span of device, even damage device.Equally when power down, if the power down of kernel elder generation also large electric current might occur, so General Requirements CPU core power supply is prior to the I/O power supply electrifying, afterwards in the I/O power supply power-fail.But CPU core power supply and worker/0 Power supply time phase difference can not be oversize (generally can not be greater than 1 second, otherwise also can affect the life-span of device or damage device), be protection DSP device,
Should between CPU core power supply and I/O power supply, also to add a Schottky diode.DSP power supply with the order control that powers on
Circuit such as Fig. 4.
4. power supply monitoring circuit and reset circuit:
For guaranteeing that dsp chip is not when power supply meets the requirements of level, can not produce uncontrolled state, must in system, add Power Supply Monitoring and reset circuit, guaranteed in the system power-up process by this circuit, before core voltage and peripheral port voltage reach requirement, dsp chip is in reset mode all the time, until core voltage and peripheral interface voltage reach desired level.If in a single day supply voltage drops to below the threshold value simultaneously, then force chip to enter reset mode, guarantee system stability work.For the design of reset circuit, the low level time long enough (generally needing more than the 20ms) of should guaranteeing to reset on the one hand guarantees the DSP reliable reset; Should guarantee on the other hand to have good stability, prevent that the DSP mistake from resetting.Should guarantee that generally the RESET input (RS) low level continues 6 clock cycle at least, be 300ns when even clock is 20MHz.But after powering on, the crystal oscillator of system often needs the stationary phase of hundreds of millisecond, so generally can be made as 100 ~ 300ms.During design can with two signals of electrification reset and hand-reset through logic mutually with, then deliver to the input pin that resets of DSP, specifically as shown in Figure 5.
Figure 6 shows that the DSP program flow diagram, formed by main program and interrupt routine.Its course of work is as follows: begin to carry out initialization procedure after system powers on, initialization procedure comprises the initial setting of A/D mouth, PWM mouth etc.When just starting, setting voltage is output as zero, and makes voltage be shown as zero.Then start A/D, the set point of sampled voltage, can select the grade of output voltage this moment.Then regulate the BUCK circuit with soft starting mode, this moment, the duty ratio of PWM mouth slowly became large with certain speed.In showing the process of voltage, 0. 5 seconds time-delay should be arranged and refresh.Show it also is the adjusting of adopting PWM mouth duty ratio, utilize filter circuit to realize the D/A conversion, this signal is directly supplied with the specialized voltages display module.The A/D interruption frequency is 20kHz.Whole like this main program is being waited for back and forth circulation between A/D interruption and the Graphics Processing.Interrupt routine mainly comprises the response that the power protection is interrupted, and drives generation, the calculating of feedback voltage, the realization of serial communication and some other miscellaneous function of signal phase difference.When central stopping pregnancy was given birth to, DSP successively interrupted according to each priority and jumps to the respective interrupt subprogram and carry out.
Claims (6)
1. the high voltage direct current source module of DPS control, comprise the power main circuit with based on the control circuit of DSP, it is characterized in that: described power main circuit comprises: exchange input, the EMC protected location, rectification filtering unit, the BUCK converter, the controlled inverter of phase-shifting full-bridge, the high frequency booster converter, the voltage multiplying rectifier unit, filter, be connected in series successively by I/O between the unit of power main circuit, AC-input voltage prevents electromagnetic interference through the filtering of EMC protected location, obtain a direct current voltage through rectification filtering unit again, then carry out pressure regulation through the BUCK converter and obtain a level and smooth direct voltage, through the controlled inverter of phase-shifting full-bridge voltage is reverse into an alternating voltage, become high-frequency ac voltage through the high frequency booster converter again, then by the rectification of voltage multiplying rectifier unit and filter filtering, obtain the high-quality that needs, high-quality direct voltage;
Described control circuit comprises: DSP control unit, voltage dividing potential drop feedback sample unit, DSP accessory power supply and keyboard/display circuit, wherein the input of voltage dividing potential drop feedback sample unit is connected in the DSP control unit and samples, keyboard/display circuit links to each other with the DSP control unit by serial ports, the DSP control unit is controlled output voltage according to the front and back brachium pontis phase difference of the controlled inverter of feedback voltage calculating phase-shifting full-bridge of voltage dividing potential drop feedback sample unit sampling, the DSP accessory power supply provides the power supply of DSP control circuit, and keyboard/display circuit shows the electric current and voltage value.
2. the high voltage direct current source module of a kind of DPS control according to claim 1, it is characterized in that: described rectification filtering unit selects MT3516 type three-phase bridge heap to carry out rectification, and filter capacitor is selected capacity 4700PF, withstand voltage for exchanging the safety electric capacity of 400V.
3. the high voltage direct current source module of a kind of DPS control according to claim 1, it is characterized in that: described BUCK converter selects the MOSFET of IRFP460 type as the main switch of BUCK circuit, fly-wheel diode selects reverse recovery time short, has the Schottky diode of soft recovery characteristics.
4. the high voltage direct current source module of a kind of DPS control according to claim 1, it is characterized in that: the controlled inverter of described phase-shifting full-bridge adopts phase-shift full bridge parallel resonance structure, switching device adopts integrated power module, resonant tank adopts large inductance and the little capacitances in series resonance way of output in parallel, and its resonance frequency is less than switching frequency.
5. the high voltage direct current source module of a kind of DPS control according to claim 1, it is characterized in that: described high frequency booster converter adopts two transformers, first order isolation, boost in the second level, the high frequency booster converter is sealed in the fuel tank, and the primary and secondary coil turn of first order transformer is the same with the number of primary turns of second level transformer.
6. the high voltage direct current source module of a kind of DPS control according to claim 1, it is characterized in that: it is control core that described control circuit based on DSP adopts the TMS320LF2407 dsp chip of TI company, voltage dividing potential drop feedback sample unit adopts voltage and current ring feedback formula to carry out voltage stabilizing control, high side voltage adopts highvoltage resistance potential divider to sample, utilize amplifier to carry out impedance matching, then utilize the linear light lotus root to isolate, last signal enters the A/D conversion of DSP by dividing potential drop filtering.
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