CN101662214B - High voltage isolating switch power and a plurality of output isolated switch power systems - Google Patents
High voltage isolating switch power and a plurality of output isolated switch power systems Download PDFInfo
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Abstract
The invention belongs to the field of power electronics and aims at providing a high voltage isolating switch power and a plurality of output isolated switch power systems. The switch power is inputted by AC power sources, inputted into a filter capacitor in parallel after being isolated and rectified by a transformer to change the impedance property, and then outputted by a conventional high frequency switch convertor; and the regulation direction of the switch power is opposite to the conventional direction. Output is divided into a voltage mode and a current mode; and an energy storage value of an output filter capacitor or inductance is higher than that of an input filter capacitor. The circuit and control method adopted by the voltage isolating switch power and the plurality of output isolated switch power systems have the characteristics of compact structure, simple circuit, high working efficiency and low mutual interference among a plurality of auxiliary power sources, which are especially applicable to distributed auxiliary power supply needing high voltage and superhigh voltage insulated isolation, and can be applied in high voltage power electronic equipment. The high voltage isolating switch power and the plurality of output isolated switch power systems can also directly obtain electric energy from transmission lines of a power system, and assist to supply power for the power electronic equipment in an intelligent grid system.
Description
Technical field
The invention belongs to field of power electronics, be the switch power supply system of a kind of high voltage isolating switch power and a plurality of output isolation.
Background technology
High voltage isolated power supply is applied to high-tension field of power electronics, and the aspects such as driving of power semiconductor in detecting instrument, instrument, electronic power convertor all need to use the accessory power supply that former and deputy limit isolation voltage reaches thousands of volts.Often in a table apparatus or instrument, just need use a plurality of such insulating power supplies.Traditional insulating power supply generally is difficult to the insulation request that reaches such, and (for example 100kV) makes difficulty especially in the superhigh pressure field.Because the cause of high pressure insulation request, with such power supply that conventional scheme is produced, often its volume is big, cost is high, inefficiency.
Patented technology " multi-output isolated power supply that is used for power electronic equipment " (ZL01145559.4) provides the distributed high voltage isolated power supply scheme of a kind of current source as input, and the technical superhigh pressure that proposes above of having answered is isolated and the low-cost problem that realizes.Because the lateral circuit of opening the secondary in this patented technology adopts linear power supply bypass scheme, when load is unloaded, will consume whole rated power, and the power of this consumption there is the corresponding heat of generation.Therefore, the power work efficient of this scheme is lower, particularly under the not high situation of load factor.Simultaneously, the volume of this power supply can not be too little, needs bigger area of dissipation.The circuit of this power supply as shown in Figure 1.
Adopt Switching Power Supply can reduce consumption, when zero load,, make the secondary power supply on current source, not present voltage drop the rectifier terminal switch bypass.This has been had the switch mode power of several current mode inputs of research report be:
The one, main circuit adopts the paralleling switch output voltage controlled by return difference, when output end voltage is too high, with transformer secondary (passing through rectifier) bypass, makes alternating current not produce pressure drop on transformer, thereby temporarily blocks input power; When output is reduced to low slightly voltage, by-pass switch open circuit, power supply continue to receive input power.This scheme output voltage pulsation is higher.Referring to " multichannel output isolated drive circuit and the application in short circuit current limiter thereof, power technology is used .2003.12 ".The circuit of this power supply as shown in Figure 2.
The 2nd, main circuit adopts the paralleling switch PWM control synchronous with the input AC electric current, when output end voltage is too high, transformer secondary (passing through rectifier) is increased the bypass ratio, make alternating current not on transformer pressure drop mean value descend to some extent, thereby the control input power.This scheme output voltage pulsation can be lower.Regrettably, a plurality of such secondary power supplys are tandem workings, during synchronous working, only there are forward position or the back of PWM to be utilized along voltage partly, will produce the PWM ripple (width is big or small and different according to load) that acts in agreement at former limit (current source) when number is a lot, its total voltage drop peak value is the PWM voltage amplitude sum of each secondary power supply on current source.This is the interfering current source operate as normal both, limits secondary power supply series connection number (because the current source in the practicality, it is conditional that its total output voltage falls) again.Because no matter the loading level what state, maximum serial number restriction all is the same.The main circuit of this power supply as shown in Figure 3.
The 3rd, main circuit adopts and the asynchronous paralleling switch PWM control of input AC electric current, and the frequency of PWM will be higher than ac current source several times above (at least 5 times) usually.Regrettably, the switching frequency of sort circuit is very high, has increased switching loss.In addition because the bypass of secondary circuit input is to have randomness, the situation of a plurality of secondary power supply synchro switches (promptly presenting simultaneously voltage drop on current source) still has certain probability of occurrence, still can not thoroughly solve the series connection secondary power supply problem of the number under the low weight situation of load.The main circuit of this power supply also as shown in Figure 3.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of high voltage isolating switch power is provided, and the switch power supply system of isolating based on a plurality of outputs of this high voltage isolating switch power.
The thinking that the present invention will deal with problems is: with reference to patented technology " multi-output isolated power supply that is used for power electronic equipment " (ZL01145559.4), current source power to former limit still presents even absorption, to eliminate of the interference of switch wave mode to the primary current source, secondary power supply wherein then adopts the HF switch mode of operation, power technology of the present invention improves, and is mainly reflected on secondary power supply wherein.
The present invention is by the following technical programs to realize the foregoing invention purpose:
A kind of high voltage isolating switch power is provided, comprise that its former limit is connected to the isolating transformer of ac current source by ac bus, the secondary of described isolating transformer be linked in sequence rectifier, input filter condenser, switching converter main circuit and output filter, the output of output filter is the output of high voltage isolating switch power, and the input of switching regulaor and output connect this output and HF switch current transformer main circuit respectively; Described output filter is any one in output filter capacitor or the output inductor, and the specified energy storage value of its circuit is more than 3 times of input filter condenser.
Described switching regulaor is a control circuit commonly used in the Switching Power Supply, usually possess ratio, integration, differential (PID) class regulatory function, and regulate the work of (PFM) mode control switch current transformer main circuit with pulse width modulation (PWM), pulse frequency, so-called switching converter main circuit is the main circuit of Switching Power Supply.
As a kind of improvement, when described output filter is output filter capacitor, output be direct voltage; When described output filter is output inductor, output be direct current.
As a kind of improvement, described switching converter main circuit is the switching converter main circuit that possesses invert function, then: when described output filter is output filter capacitor, output be alternating voltage; When described output filter is output inductor, output be alternating current.
When described ac current source was the high-frequency ac current source, described rectifier and switching converter main circuit were respectively hf rectifier and HF switch current transformer main circuit.
As a kind of improvement, the specified energy storage value of the circuit of described output filter capacitor or output inductor is 10～100 times of input filter condenser.
As a kind of improvement, described isolating transformer is the transformer of former limit single turn.
As a kind of improvement, described switching converter main circuit is conventional booster type convertor circuit (Boost).
Further object of the present invention provides a kind of switch power supply system of isolating based on a plurality of outputs of aforesaid any one high voltage isolating switch power, the ac bus that comprises ac current source and formation loop, this system comprises the high voltage isolating switch power of some groups of shared these ac bus, and the former limit of the isolating transformer of each high voltage isolating switch power is connected in series by ac bus.
Beneficial effect of the present invention is:
The switch power supply system that a plurality of outputs are isolated among the present invention has the high advantage of efficient, and the high voltage isolating switch power number that allows series connection on a current source is more than the Switching Power Supply of the synchronous PWM control that linear power supply and background technology are mentioned.
Mesohigh isolating switch power of the present invention, rectifier behind its isolating transformer connects input filter condenser, commutating voltage is steady direct current, the feasible voltage that is reflected to the current source of power input is reduced to the square wave of an amplitude stabilization, and input power is the amplitude that the mean value of input current multiply by square wave.When load reduction, commutating voltage descends, and input power descends simultaneously, and the voltage drop amplitude of current source also descends.When load was stablized, the high load capability of system was the voltage landing sum of each high voltage isolating switch power on current source, reached the permission maximum output voltage of current source.
The present invention compares with linear circuit, and efficient increases substantially on the one hand, allows the former limit of more high voltage isolated power supply to be connected on the current source on the other hand.For example isolating the voltage drop of linear power supply on current source at each high pressure is 6V, and the output voltage that current source allowed is 150V, is 25 so a current source allows the high pressure of tandem working to isolate the linear power supply number; In the present invention, if the average load rate is 25%, i.e. the voltage drop of each high voltage isolating switch power on current source is 1.5V, and it is 100 that a current source allows the high voltage isolating switch power number of tandem working.In synchronous PWM controlling schemes, the pulse amplitude of each high voltage isolating switch power is stack synchronously on current source, and the pulse amplitude load variations all is the same, so the series connection number of its permission also can reduce equally, and situation collinearity power supply is the same.
Because in the present invention, the voltage that is reflected to current source is stable square wave (amplitude is only followed load variations) in addition, and the net amplitude, the width that do not resemble a plurality of high voltage isolating switch powers in the synchronous PWM scheme change at any time, and be also bigger to the interference of current source.
Circuit and control mode that the present invention adopts, have that compact conformation, circuit are simple, high efficiency, the low characteristics of a plurality of accessory power supply phase mutual interference, needing to be particularly suitable for the distributed auxiliary power supply of high pressure, superhigh pressure insulation isolation, in the high-tension electricity electronic equipment, to use.For example be used for the high pressure isolation drive of power semiconductor, the aspects such as input of device.
The present invention can also directly obtain electric energy (the power transmission line single turn passes isolating transformer of the present invention) from the transmission line of electric power system, be power electronic equipment and power system automation apparatus in the intelligent grid system, provide have high pressure, the accessory power supply of superhigh pressure insulation isolation performance.
Description of drawings
Fig. 1 is the linear power supply schematic diagram of current source input in the prior art.
Fig. 2 is current source input in the prior art, and output voltage is subjected to the Switching Power Supply schematic diagram of return difference control.
Fig. 3 is the Switching Power Supply main circuit of PWM control in the prior art.
Fig. 4 is the realization theory diagram that uses output filter capacitor among the present invention.
Fig. 5 is the realization theory diagram that uses output inductor among the present invention.
Fig. 6 is the switch power supply system that a plurality of outputs are isolated among the present invention.
Fig. 7 is ac current source input, a PWM high voltage isolator voltage source case schematic diagram among the present invention.
Fig. 8 is the case schematic diagram of the switch power supply system that a plurality of outputs are isolated among the present invention.
Embodiment
Describe the embodiment of technical scheme in detail with reference to accompanying drawing:
The switch power supply system that a plurality of outputs among the present invention are isolated comprises the high voltage isolating switch power of some groups of shared ac bus, and the former limit of the isolating transformer of each high voltage isolating switch power is connected in series to exchanging current source by ac bus.
High voltage isolating switch power comprises that its former limit is connected to the isolating transformer of ac current source by ac bus, the secondary of described isolating transformer be linked in sequence rectifier, input filter condenser, switching converter main circuit and output filter, the output of output filter is the output of high voltage isolating switch power, and the input of switching regulaor and output connect this output and HF switch current transformer main circuit respectively; Described switching converter main circuit adopts custom circuit, but possesses and the opposite adjusting direction of conventional voltage source control; Described output filter is any one in output filter capacitor or the output inductor, and the specified energy storage value of its circuit is more than 3 times of input filter condenser.
As a kind of improvement, described switching converter main circuit is conventional booster type convertor circuit.
The present invention proposes the Switching Power Supply of current source input, divides two kinds of output voltage type and current output types, when being output as voltage-type, adopts output filter capacitor; When being output as current mode, adopt output inductor.Output is direct current generally speaking, certainly if the HF switch current transformer possesses invert function, and then also can output AC voltage (or electric current).
Key point of the present invention is:
With AC power input, behind over commutation, make it to change the impedance property of input by input filter condenser, be transformed to controlled voltage source or current source by the HF switch current transformer again.
Rectifier can adopt custom circuit, and when ac current source was high frequency, rectifier need be used the high-frequency rectification device.
The switching converter main circuit can adopt custom circuit, but the adjusting direction is opposite.Adopt input filter condenser on the one hand, changed the input impedance characteristic, therefore still can adopt the imported switching converter main circuit of conventional voltage.On the other hand, the impedance change effect of electric capacity is more effective for transient state or high frequency, is that influence is little or do not have an effect for the low frequency of input current or flip-flop.
About regulating the opposite saying of direction, make an explanation specially here.From the adjusting direction of stable state, when output voltage (or electric current) raise, what need was to reduce intake stream.Conventional way is to reduce translation circuit to obtain electric current from voltage source end (being the input filter condenser end).But for the current source of power supply, reduce and obtain electric current, terminal voltage is further raise, cause from the energy of current source intercepting more from input (being the input filter condenser end).Therefore must take to control rightabout adjusting measure with conventional voltage source.Though temporarily increase output voltage (or electric current) is further increased, because the energy that intercepts from electric current reduces, finally can be stabilized in reduced levels subsequently from input filter condenser.
Because above-mentioned adjustment process has a rightabout beginning course of reaction, so the specified energy storage value of the circuit of output filter capacitor (or outputting inductance) should be on the input filter condenser, otherwise the adjustment process output pulsation is excessive.Rule of thumb, this ratio needs 3 times at least.Like this, when the reaction speed of input just far faster than output, make the above-mentioned rightabout fluctuating level of output very little.The specified energy storage value of so-called circuit for capacitor, is exactly the capacitance that square multiply by of circuit rated voltage; For inductance, be exactly the inductance value that square multiply by of circuit rated current.
The switching pulse control mode of Switching Power Supply main circuit of the present invention is also various, for example can be PWM, also can be PFM (arteries and veins is controlled frequently) etc., difference be that above-mentioned adjusting direction is opposite.
The shared high-frequency ac current bus of the Switching Power Supply input of a plurality of the invention described above is mixed the alternating current generator, constitutes the switch power supply system that a plurality of output of the present invention is isolated, specifically referring to accompanying drawing 6.The same patent of this system of the present invention " multi-output isolated power supply that is used for power electronic equipment " starting point (ZL01145559.4) is consistent, and different is the Switching Power Supply that secondary power supply of the present invention adopts the invention described above; Relevant alternating current source generator, its output current can be an ac square wave, disturbs for reducing EMI, also can adopt AC sine wave, or is similar to square wave and sinusoidal wave alternating current ripple; The operating frequency that improves ac current source then helps above-mentioned output filter capacitor (or outputting inductance) reduced volume.
Among the present invention, the specified energy storage value of the circuit of output filter capacitor is input filter condenser or output inductor 10～100 times.This rule of thumb obtains, and this ratio is high more, and the adjustment process output pulsation is more little.Cross low ratio, the adjustment process output pulsation is excessive, will make circuit of the present invention lose result of use.It is imported that this point also is different from the common electrical potential source, in custom circuit, do not have strict restriction for the ratio of two capacitances, require output must be than input big.
Isolating transformer of the present invention is the transformer of former limit single turn.Adopting the benefit of single-turn transformer is not only that structure is very simple, still can adapt to the connection request of power system transmission line, can also adapt to the superhigh pressure insulation request.The single turn lead passes through ring-like magnetic element still easily, and the single turn lead can itself be exactly the high-tension electricity cable core of tape insulation cover, is very inconvenient and require thick cable core coiling multi-turn on transformer.The secondary of isolating transformer according to the output requirement, can be conventional multiturn coil then.
Switching Power Supply of the present invention be input as high-frequency ac current.The frequency in input current source is high more, and the size of Switching Power Supply just can be done more for a short time.
Switching converter main circuit of the present invention is conventional booster type convertor circuit, specifically referring to accompanying drawing 7.
Accompanying drawing 7 is PWM high voltage isolator voltage source cases of ac current source input of the present invention, input isolating transformer series connection ac current source, after connect rectifier, input filter condenser on the rectifier output-parallel, connect HF switch current transformer main circuit (being equivalent to conventional voltage-type Boost translation circuit) then, output filter capacitor in this main circuit output parallel connection is (when output voltage is 50% of an input voltage, the capacitance of getting output filter capacitor is 50 times of input filter condenser), output dc voltage.Main circuit switch is regulated by the PID of switching regulaor, controls in the PWM mode, and the switch operating frequency is 50kHz.When output voltage (or electric current) is bigger than normal, adjuster can increase the input current of HF switch current transformer main circuit, thereby the voltage on the reduction input filter condenser, minimizing reduce output from the energy that current source obtains, then adjusting in the other direction when output voltage is less than normal.
Accompanying drawing 8 is cases of the switch power supply system that a plurality of outputs are isolated among the present invention, and wherein single turn has been adopted on the former limit of isolating transformer, and insulated cable passes from the magnetic core of transformer of a series of high voltage isolated power supplies.
What should be understood that is: above-mentioned execution mode is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the present invention's spirit scope all fall within protection scope of the present invention.
Claims (7)
1. high voltage isolating switch power, comprise that its former limit is connected to the isolating transformer of ac current source by ac bus, it is characterized in that, the secondary of described isolating transformer be linked in sequence rectifier, input filter condenser, switching converter main circuit and output filter, the output of output filter is the output of high voltage isolating switch power, and the input of switching regulaor and output connect this output and HF switch current transformer main circuit respectively; Described switching converter main circuit adopts custom circuit, but possesses and the opposite adjusting direction of conventional voltage source control; Described output filter is any one in output filter capacitor or the output inductor, and the specified energy storage value of its circuit is more than 3 times of input filter condenser.
2. high voltage isolating switch power according to claim 1 is characterized in that, when described output filter is output filter capacitor, output be direct voltage; When described output filter is output inductor, output be direct current.
3. high voltage isolating switch power according to claim 1 is characterized in that, described switching converter main circuit is the switching converter main circuit that possesses invert function, then: when described output filter is output filter capacitor, output be alternating voltage; When described output filter is output inductor, output be alternating current.
4. high voltage isolating switch power according to claim 1 is characterized in that, the specified energy storage value of the circuit of described output filter capacitor or output inductor is 10～100 times of input filter condenser.
5. high voltage isolating switch power according to claim 1 is characterized in that, described isolating transformer is the transformer of former limit single turn.
6. high voltage isolating switch power according to claim 1 is characterized in that, described switching converter main circuit is conventional booster type convertor circuit.
7. switch power supply system of isolating based on a plurality of outputs of described any one high voltage isolating switch power of claim 1 to 6, the ac bus that comprises ac current source and formation loop, it is characterized in that, this system comprises the high voltage isolating switch power of some groups of shared these ac bus, and the former limit of the isolating transformer of each high voltage isolating switch power is connected in series by ac bus.
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| CN200910152937XA CN101662214B (en) | 2009-09-22 | 2009-09-22 | High voltage isolating switch power and a plurality of output isolated switch power systems |
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| CN200910152937XA CN101662214B (en) | 2009-09-22 | 2009-09-22 | High voltage isolating switch power and a plurality of output isolated switch power systems |
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| CN101662214B true CN101662214B (en) | 2011-09-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101807859A (en) * | 2010-03-09 | 2010-08-18 | 深圳市科陆电子科技股份有限公司 | High-voltage insulation energy supply circuit and method |
| CN102624102A (en) * | 2012-04-11 | 2012-08-01 | 东展科博(北京)电气有限公司 | Power supplying circuit and power supplying method for chain-type SVG (static var generator) modules |
| CN102931664B (en) * | 2012-10-26 | 2015-07-22 | 株洲变流技术国家工程研究中心有限公司 | Chain type SVG (static var generator) device low-pressure power supply system |
| CN103349549A (en) * | 2013-07-23 | 2013-10-16 | 上海海神医疗电子仪器有限公司 | Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment |
| CN103501116B (en) * | 2013-09-24 | 2017-01-11 | 许继电气股份有限公司 | Power supply device of high-voltage direct current electronic equipment |
| CN105606147B (en) * | 2016-03-25 | 2017-09-29 | 国网上海市电力公司 | A kind of portable trans calibrator |
| CN109600058A (en) * | 2018-12-14 | 2019-04-09 | 北京交通大学 | A kind of novel auxiliary electric power supply topological structure |
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