CN103501124A - Low-voltage and high-current switching power supply - Google Patents
Low-voltage and high-current switching power supply Download PDFInfo
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- CN103501124A CN103501124A CN201310495343.5A CN201310495343A CN103501124A CN 103501124 A CN103501124 A CN 103501124A CN 201310495343 A CN201310495343 A CN 201310495343A CN 103501124 A CN103501124 A CN 103501124A
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Abstract
The invention discloses a low-voltage and high-current switching power supply, which comprises a first rectifier and filter circuit, a high-frequency switching converter, a high-frequency transformer, a second rectifier and filter circuit, a shunt and a control module. The first rectifier and filter circuit is used for rectifying and filtering inputted 220V alternating-current voltage and outputting direct-current voltage; the high-frequency switching converter is used for inverting the inputted direct-current voltage into isolated alternating-current voltage under the control of the control module and sending the isolated alternating-current voltage to the high-frequency transformer; the high-frequency transformer is used for converting the isolated alternating-current voltage into needed alternating-current voltage and sending the needed alternating-current voltage to the second rectifier and filter circuit; the second rectifier and filter circuit is used for rectifying and filtering the needed alternating-current voltage and outputting needed direct-current voltage; the shunt is used for sampling the needed direct-current voltage outputted by the second rectifier and filter circuit and generating and sending a sampled signal to the control module; the control module controls the high-frequency switching converter according to the received sampled signal.
Description
Technical field
The present invention relates to Switching Power Supply, relate in particular to a kind of low-voltage and high-current Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch pipe turns on and off maintains a kind of power supply of regulated output voltage, and Switching Power Supply generally by pulse width modulation (PWM), controls IC and MOSFET forms.Along with development and the innovation of power electronic technology, make switch power technology also in constantly innovation.At present, Switching Power Supply, with small-sized, light weight and high efficiency characteristics nearly all electronic equipment that is widely used, is the indispensable a kind of power mode of current electronics and information industry develop rapidly.
In electroplating industry, the output voltage of General Requirements working power is lower and electric current is very large.The power requirement of power supply is also higher is all generally several kilowatts to tens kilowatts.Powerful electroplating power supply like this generally all adopts the Thyristor Controlled rectifier system at present.Its shortcoming is that volume is large, efficiency is low, noise is high, power factor is low, output ripple is large, dynamic response is slow, poor stability etc.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of low-voltage and high-current Switching Power Supply of pulse width modulating chip, can effectively improve stability and the reliability of Switching Power Supply.
For achieving the above object, the present invention takes following technical scheme:
A kind of low-voltage and high-current Switching Power Supply, comprise current rectifying and wave filtering circuit, high frequency switching converter device, No. two current rectifying and wave filtering circuits, high frequency transformer, shunt and control modules; A current rectifying and wave filtering circuit, carry out rectification, filtering for the 220V alternating voltage to input, and output dc voltage; The high frequency switching converter device, under the control of control module by the direct voltage inversion of input for isolation after alternating voltage, and send to high frequency transformer; High frequency transformer, be required alternating voltage for AC voltage conversion after isolating, and send to current rectifying and wave filtering circuit No. two; No. two current rectifying and wave filtering circuits, for required alternating voltage is carried out to rectification, filtering, and export required direct voltage; Shunt, sampled for the required direct voltage to No. two current rectifying and wave filtering circuit outputs, and the generation sampled signal sends to control module; Control module, controlled the high frequency switching converter device according to the sampled signal received.
Further, the high frequency switching converter device is full bridge inverter.Each brachium pontis adopts the IGBT insulated gate bipolar transistor, and it had both had, and input impedance is high, speed is fast, Heat stability is good and the simple advantage of drive circuit, and low, the withstand voltage high advantage of on state voltage is arranged again; The high frequency switching converter device becomes direct voltage into the rear alternating voltage of isolation, then becomes required required alternating voltage through high-frequency isolation transformer.
Further, control module adopts the UC3825 chip.It is comprised of oscillator, PWM comparator, PWM latch, output driver, Current-Limiting Comparator, overcurrent comparator, reference voltage source, fault latch device, soft starting circuit, under-voltage locking etc.Shunt carries out real-time sampling at the Switching Power Supply output, the sample rate current sampling resistor of flowing through can produce a pressure drop, using this pressure drop as feedback signal, be input to voltage comparator, with given reference voltage, compare, produce a difference, after relatively amplifying by error amplifier, the difference signal of output and sawtooth waveforms (or triangular wave) compare, thereby change the width of output pulse, when output is greater than reference voltage, reduce the pulse duration duty ratio, otherwise, increase duty ratio, to realize obtaining a stable output.
Beneficial effect: (1) the present invention adopts UC3825 chip controls full bridge inverter to realize DC inversion, each brachium pontis adopts the IGBT insulated gate bipolar transistor, it had both had that input impedance is high, speed is fast, Heat stability is good and the simple advantage of drive circuit, low, the withstand voltage high advantage of on state voltage is arranged again, can effectively improve stability and the reliability of Switching Power Supply; (2) the present invention adopts the UC3825 chip to carry out real-time feedback control to switch power source output voltage, effectively improves the stability of output voltage; (3) the present invention adopts UC3825 chip controls full bridge inverter to realize, low-voltage and high-current Switching Power Supply volume provided by the invention is little, efficiency is high, for the application of HF switch voltage in electroplating industry provides the strong guarantee of theory and practice.
The accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of low-voltage and high-current Switching Power Supply provided by the invention, comprise current rectifying and wave filtering circuit, high frequency switching converter device, No. two current rectifying and wave filtering circuits, shunt and control modules;
(1) current rectifying and wave filtering circuit, carry out rectification, filtering for the 220V alternating voltage to input, and output dc voltage; The Switching Power Supply of low-voltage and high-current is very responsive to the surge current of high-frequency interferencing signal and powered on moment, this example is in order to guarantee the circuit steady operation, elimination is from the various interference of electrical network, and the 220V civil power of input, at first through the RC filter circuit, is suppressed peak voltage.Voltage after High frequency filter, through the bridge rectifier rectification, obtains direct voltage.The filter capacitor of bridge rectifier back has the effect of discharging and recharging, the alternating component after the filtering rectification.
(2) high frequency switching converter device, be the pith of Switching Power Supply, the high frequency switching converter device, under the control of control module by the direct voltage inversion of input for isolation after alternating voltage, and send to high frequency transformer; Inverter circuit adopts the full-bridge conversion; four arms that formed bridge by 4 IGBT switching tubes, each IGBT 1 high-speed power diode in parallel, when its clamping action is converted to cut-off to reduce switching tube by conducting; the due to voltage spikes that transformer produces, not breakdown with the protection switch pipe.IGBT, insulated gate bipolar transistor, both had that input impedance is high, speed is fast, Heat stability is good and the simple advantage of drive circuit, and low, the withstand voltage high advantage of on state voltage is arranged again.The grid of switching tube IGBT receives pwm signal, when gate pole adds positive voltage, forms raceway groove in MOSFET, and for the PNP transistor provides base current, thereby make the IGBT conducting.Now from the P district, be injected into the N district and carry out electricity and lead modulation, reduce the resistance value of N mono-, make high withstand voltage IGBT also there is low on-state voltage drop.While on gate pole, adding negative voltage, the raceway groove in MOSFET disappears.The transistorized base current of PNP is cut off, and IGBT turn-offs.T1, T4 and, I2, high frequency break-make in turn, become direct voltage into alternating voltage, then become required isolation output AC voltage through high-frequency isolation transformer.
(3) high frequency transformer, be required alternating voltage for AC voltage conversion after isolating, and send to current rectifying and wave filtering circuit No. two; This example high frequency transformer adopts the nanocrystalline annular core high frequency transformer of iron-based niobium copper, and this transformer has the characteristics such as loss is little, leakage inductance is low, volume is little.
(4) No. two current rectifying and wave filtering circuits, for required alternating voltage is carried out to rectification, filtering, and export required direct voltage; Inverter voltage by high-frequency isolation transformer output, the rectification circuit rectification formed through high-power high-frequency rectifier diode SBD (being Schottky diode), output dc voltage after the filtering of LC filter circuit again, the shunt of output is sampled to output, be sent to control circuit and carry out regulating and controlling, the voltage of stable output.
(5) shunt, be the direct current shunt, for the required direct voltage to No. two current rectifying and wave filtering circuit outputs, sampled, and the generation sampled signal sends to control module;
(6) control module, get UC3825 as control chip, and it is comprised of oscillator, PWM comparator, PWM latch, output driver, Current-Limiting Comparator, overcurrent comparator, reference voltage source, fault latch device, soft starting circuit, under-voltage locking etc.The highest switching frequency of UC3825 can reach 1MHz, the output pulse maximum traffic delay time is 50ns, there is the functions such as soft start control and under-voltage locking, the control circuit of the Functional Design Switching Power Supply of application UC3825,2 pulse output ends of UC3825 drive signal for switching tube IGBT provides PWM, alternately export pulse.Therefore, the frequency of each output output pulse is 1/2 of oscillator frequency, the frequency of oscillator is 200kHz, so the frequency of output pwm pulse is 100kHz, output pulse duty factor 0%～50% with interior adjustment, for fear of bridgc arm short, set up and put Dead Time, so generally do not reach 50% in practical application.
During Switching Power Supply work, No. one current rectifying and wave filtering circuit carries out rectification, filtering to electrical network 220V alternating voltage, and output dc voltage, the high frequency switching converter device is the rear alternating voltage of isolation by the direct voltage inversion under the control of control module, it is required alternating voltage that high frequency transformer will be isolated rear AC voltage conversion, No. two current rectifying and wave filtering circuit carries out rectification, filtering to required alternating voltage, and exports required direct voltage; Shunt is sampled to the required direct voltage of No. two current rectifying and wave filtering circuit outputs, the sample rate current sampling resistor of flowing through can produce a pressure drop, using this pressure drop as feedback signal, be input to voltage comparator, with given reference voltage, compare, produce a difference, after relatively amplifying by error amplifier, the difference signal of output and sawtooth waveforms (or triangular wave) compare, thereby change the width of output pulse, when output is greater than reference voltage, reduce the pulse duration duty ratio, otherwise, increase duty ratio, to realize obtaining a stable output.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. a low-voltage and high-current Switching Power Supply is characterized in that: comprise current rectifying and wave filtering circuit, high frequency switching converter device, No. two current rectifying and wave filtering circuits, high frequency transformer, shunt and control modules;
A current rectifying and wave filtering circuit, carry out rectification, filtering for the 220V alternating voltage to input, and output dc voltage;
The high frequency switching converter device, under the control of control module by the direct voltage inversion of input for isolation after alternating voltage, and send to high frequency transformer;
High frequency transformer, be required alternating voltage for AC voltage conversion after isolating, and send to current rectifying and wave filtering circuit No. two;
No. two current rectifying and wave filtering circuits, for required alternating voltage is carried out to rectification, filtering, and export required direct voltage;
Shunt, sampled for the required direct voltage to No. two current rectifying and wave filtering circuit outputs, and the generation sampled signal sends to control module;
Control module, controlled the high frequency switching converter device according to the sampled signal received.
2. a kind of low-voltage and high-current Switching Power Supply according to claim 1, it is characterized in that: described high frequency switching converter device is full bridge inverter.
3. a kind of low-voltage and high-current Switching Power Supply according to claim 1, is characterized in that: described control module employing UC3825 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310495343.5A CN103501124A (en) | 2013-10-21 | 2013-10-21 | Low-voltage and high-current switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310495343.5A CN103501124A (en) | 2013-10-21 | 2013-10-21 | Low-voltage and high-current switching power supply |
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| CN103501124A true CN103501124A (en) | 2014-01-08 |
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| CN201310495343.5A Pending CN103501124A (en) | 2013-10-21 | 2013-10-21 | Low-voltage and high-current switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494997A (en) * | 2018-12-29 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of high frequency switch power based on MOSFET pipe |
| CN110174554A (en) * | 2019-03-25 | 2019-08-27 | 上海微程电气设备有限公司 | Digital high resistance measurement device |
| CN111239467A (en) * | 2020-03-13 | 2020-06-05 | 成都世翌信科技有限责任公司 | High-isolation voltage-resistant alternating-current voltage sensor |
-
2013
- 2013-10-21 CN CN201310495343.5A patent/CN103501124A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494997A (en) * | 2018-12-29 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of high frequency switch power based on MOSFET pipe |
| CN110174554A (en) * | 2019-03-25 | 2019-08-27 | 上海微程电气设备有限公司 | Digital high resistance measurement device |
| CN111239467A (en) * | 2020-03-13 | 2020-06-05 | 成都世翌信科技有限责任公司 | High-isolation voltage-resistant alternating-current voltage sensor |
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Application publication date: 20140108 |
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| WD01 | Invention patent application deemed withdrawn after publication |