CN101577489A - Soft switching converter suitable for sensitive bidirectional current loads - Google Patents
Soft switching converter suitable for sensitive bidirectional current loads Download PDFInfo
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- CN101577489A CN101577489A CNA2009100434029A CN200910043402A CN101577489A CN 101577489 A CN101577489 A CN 101577489A CN A2009100434029 A CNA2009100434029 A CN A2009100434029A CN 200910043402 A CN200910043402 A CN 200910043402A CN 101577489 A CN101577489 A CN 101577489A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a soft switching converter suitable for sensitive bidirectional current loads, which comprises a main circuit of the conventional H-bridge converter, wherein the main circuit for the conventional H-bridge converter consists of a main switch T1, a main switch T2, a main switch T3, a main switch T4 and a follow current diode. The soft switching converter suitable for the sensitive bidirectional current load is characterized in that an auxiliary resonant network is connected in parallel between the T1 and the T4 and the T2 and the T3 and comprises a resonant inductor Lr and a resonant capacitor Cr; a sensitive load Lo and a sensitive load Ro are connected in parallel between the resonant inductor Lr and the resonant capacitor Cr; and a resonant diode Dr1 and a resonant diode Dr2 are connected in series with the resonant inductor Lr and connected in parallel with a resonant switch Tr1 and a resonant switch Tr2. The invention greatly reduces the switch loss of the converter under the condition of high-frequency operation, improves the normal work efficiency of the converter to be more than 90 percent within 20 KHz chopping frequency after the converter is applied to an excitation source of a motor, obviously reduces the electromagnetic interference and the voltage and current impact of power switches, makes the voltage peak value of the power switches basically equal to the supply voltage, can be directly modified on the conventional H-bridge converter, and has low cost.
Description
Technical field
The present invention relates to a kind of soft switch transducer that can carry out the effective control of bidirectional safe to the electric current of inductive load.
Background technology
Inductive load exists in actual life in a large number, and as excitation winding, the armature winding of various motors, an ore dressing and electromagnet of reusing etc. all is an inductive load, and emerging magnetic suspension train relies on the huge levitating electromagnet of inductance value to realize suspension operation especially.Thereby the effect of the switch converters in the existing motor excitation power supply is exactly an electric current of wanting to control according to the suitable effective voltage of the control command output of input magnet exciting coil, and the precision of its output and stability directly influence the precision and the stability of motor excitation.Lifting along with motor performance, just require the switch converters of field power supply must have higher output accuracy and stability, and require exciting current to regulate fast on a large scale, also just require the switch converters of field power supply must have higher governing speed and bandwidth.Along with the increase of capacity motor, the principal voltage of field power supply switch converters has risen to about DC300V, and output current is also bigger, and maximum can reach several kiloamperes, and voltage and current stress is bigger.The magnet exciting coil of large-size machine is a very big inductance, inductance value can reach H level level, when the field power supply quick adjustment, flowing through the electromotive force that the current changing rate of load inducts out can be very high, and the switch converters of field power supply must can bear this back electromotive force.The switch converters of field power supply is operated in the environment of high-voltage large current large impact, is the easiest link that breaks down in the excitation system.The switch converters of existing field power supply generally adopts H bridging parallel operation.But the switching loss of traditional H bridging parallel operation is big, and efficient is low, and normal efficiency less than 80% when the 20KHZ chopping frequency needs the radiator of huge, heavy.Electromagnetic interference is also very serious, has influence on the operate as normal of other electric equipment.The voltage current impact of power switch is also bigger, and often due to voltage spikes can reach the twice of supply voltage, makes the reliability of switch converters reduce.
Summary of the invention
The objective of the invention is to overcome the above shortcoming of traditional H bridging parallel operation, a kind of soft switch transducer of suitable sensitive bidirectional current loads is provided, can when both end voltage be zero, open or turn-off to realize master power switch, the auxiliary power switch can be opened or turn-off when electric current is zero flowing through, thereby the switching loss of this converter when high-frequency work obviously reduced, electromagnetic radiation obviously reduces, and the power switch voltage current impact obviously reduces.
The technical solution adopted in the present invention is: comprise the traditional H bridging parallel operation major loop that is made of main switch T1, T2, T3, T4 and fly-wheel diode, it is characterized in that, between T1, T4 and T2, T3, be parallel with an auxiliary resonant net, described auxiliary resonant net comprises a resonant inductance Lr and a resonant capacitance Cr, between resonant inductance Lr and resonance capacitor C r, be parallel with inductive load Lo and Ro, be in series with resonance diode Dr1 and Dr2 on resonant inductance Lr, resonance diode Dr1 and Dr2 are parallel with resonant switch Tr1 and Tr2.
Described resonant switch Tr2 or Tr1 are in main switch T1 and T3 or T2 and T4 conducting between the off period, make resonant inductance Lr and resonance capacitor C r that resonance take place, make main switch T1 and T3 or T2 and T4 open-minded when both end voltage resonance is zero, resonant switch Tr2 or Tr1 turn-off when the electric current that flows through is zero.
Described traditional H bridging parallel operation major loop is cascaded H bridge converter major loop or H bridging parallel operation major loop in parallel.
The invention has the beneficial effects as follows, only need on the basis of traditional H bridging parallel operation, to add an auxiliary resonant net, just realized the soft switch work of converter, greatly reduce the switching loss of converter when high-frequency work, be applied to bring up to more than 90% in the efficient of 20KHZ chopping frequency operate as normal behind the motor excitation power supply; Do not use the radiator of huge, heavy, electromagnetic interference significantly reduces; The more obvious reduction of the voltage current impact of power switch, the due to voltage spikes of power switch equals supply voltage substantially.Can directly change on traditional H bridging parallel operation, cost is low, to control algolithm without any influence.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the circuit diagram when being applied to the motor excitation power supply.
Embodiment
Circuit theory of the present invention is as shown in Figure 1: traditional H bridging parallel operation major loop is to be made of main switch T1, T2, T3, T4 and fly-wheel diode separately, wherein T1 and T3, T2 and T4 open simultaneously or turn-off, T1 and T4 are that complementation is opened or turn-offed, and T4 turn-offed when promptly T1 opened, T4 was open-minded when T1 turn-offed.Between T1, T4 and T2, T3, be parallel with an auxiliary resonant net, comprise a resonant inductance Lr and a resonant capacitance Cr, between resonant inductance Lr and resonance capacitor C r, be parallel with inductive load Lo and Ro, on resonant inductance Lr, be in series with resonance diode Dr1 and Dr2, resonance diode Dr1 and Dr2 are parallel with resonant switch Tr1 and Tr2, described resonant switch Tr2 or Tr1 make resonant inductance Lr and resonance capacitor C r that resonance take place in main switch T1 and T3 or T2 and T4 conducting between the off period.
Embodiment: be applied to the motor excitation power supply
In conjunction with Fig. 2: during practical application, main switch and resonant switch can be selected controlled power elements such as GTR, MOSFET or IGBT for use, and the motor excitation power supply is selected IGBT for use,
Electric capacity E filtering forms dc bus and supplies with main switch T1, T4 in traditional H bridging parallel operation major loop.When load current flows to B by A, at main switch T1 and T3 between the off period, the fly-wheel diode conducting afterflow of T2 and T4, the electric current among the load inductance Lo is by A to B.Open resonant switch Tr2 this moment, turn-off resonant switch Tr1, resonant inductance Lr electric current begins to increase by zero, and the electric current linearity in the fly-wheel diode of T2 and T4 reduces.When the electric current in the fly-wheel diode of T2 and T4 was reduced to zero, the fly-wheel diode of T2 and T4 was become by conducting and ends, and resonant inductance Lr and resonance capacitor C r begin resonance.When resonant inductance Lr current resonance arrived zero, also resonance was to zero for main switch T1 and T3 both end voltage, and this moment, main switch T1 and T3 just can be open-minded under zero voltage condition, and resonant switch Tr2 just can turn-off under the zero current situation.When main switch T1 and T3 shutoff, because the effect of resonant capacitance Cr, the voltage at main switch T1 and T3 two ends rises to supply voltage gradually from zero, so main switch T1 and T3 turn-off under zero voltage condition.
When load current flows to A by B, at main switch T2 and T4 between the off period, the fly-wheel diode conducting afterflow of T1 and T3, electric current flows to A by B among the load inductance Lo.Open resonant switch Tr1 this moment, turn-off Tr2, resonant inductance Lr electric current begins to increase by zero, and the electric current linearity in the fly-wheel diode of T1 and T3 reduces.When the electric current in the fly-wheel diode of T1 and T3 was reduced to zero, the fly-wheel diode of T1 and T3 was become by conducting and ends, and the resonant inductance Lr and the capacitor C r that shakes begin resonance.When resonant inductance Lr current resonance arrived zero, also resonance was to zero for main switch T2 and T4 both end voltage, and this moment, main switch T2 and T4 just can be open-minded under zero voltage condition, and resonant switch Tr1 just can turn-off under the zero current situation.When main switch T2 and T4 shutoff, because the effect of resonant capacitance Cr, the voltage at main switch T2 and T4 two ends rises to supply voltage gradually from zero, so main switch T2 and T4 turn-off under zero voltage condition.
Claims (3)
1. the soft switch transducer of a suitable sensitive bidirectional current loads, comprise the traditional H bridging parallel operation major loop that constitutes by main switch T1, T2, T3, T4 and fly-wheel diode, it is characterized in that, between T1, T4 and T2, T3, be parallel with an auxiliary resonant net, described auxiliary resonant net comprises a resonant inductance Lr and a resonant capacitance Cr, between resonant inductance Lr and resonance capacitor C r, be parallel with inductive load Lo and Ro, be in series with resonance diode Dr1 and Dr2 on resonant inductance Lr, resonance diode Dr1 and Dr2 are parallel with resonant switch Tr1 and Tr2.
2. the soft switch transducer of suitable sensitive bidirectional current loads according to claim 1, it is characterized in that, described resonant switch Tr2 or Tr1 are in main switch T1 and T3 or T2 and T4 conducting between the off period, make resonant inductance Lr and resonance capacitor C r that resonance take place, make main switch T1 and T3 or T2 and T4 open-minded when both end voltage resonance is zero; Described resonant switch Tr2 or Tr1 turn-off when the electric current that flows through is zero.
3. the soft switch transducer of suitable sensitive bidirectional current loads according to claim 1 is characterized in that, described traditional H bridging parallel operation major loop is cascaded H bridge converter major loop or H bridging parallel operation major loop in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100434029A CN101577489A (en) | 2009-05-14 | 2009-05-14 | Soft switching converter suitable for sensitive bidirectional current loads |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100434029A CN101577489A (en) | 2009-05-14 | 2009-05-14 | Soft switching converter suitable for sensitive bidirectional current loads |
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| CN101577489A true CN101577489A (en) | 2009-11-11 |
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| CNA2009100434029A Pending CN101577489A (en) | 2009-05-14 | 2009-05-14 | Soft switching converter suitable for sensitive bidirectional current loads |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746555A (en) * | 2013-12-30 | 2014-04-23 | 镇江市高等专科学校 | Maglev chopper and control method |
| CN105281574A (en) * | 2014-06-20 | 2016-01-27 | 国家电网公司 | LC parallel bidirectional resonance DC/DC converter and control method thereof |
| CN108347167A (en) * | 2017-01-25 | 2018-07-31 | 通用电气公司 | System and method for soft handover DC-DC converters |
| CN109742957A (en) * | 2019-02-12 | 2019-05-10 | 深圳市新能力科技有限公司 | A kind of bicyclic complex resonance type soft switch transducer |
-
2009
- 2009-05-14 CN CNA2009100434029A patent/CN101577489A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746555A (en) * | 2013-12-30 | 2014-04-23 | 镇江市高等专科学校 | Maglev chopper and control method |
| CN105281574A (en) * | 2014-06-20 | 2016-01-27 | 国家电网公司 | LC parallel bidirectional resonance DC/DC converter and control method thereof |
| CN105281574B (en) * | 2014-06-20 | 2019-02-22 | 国家电网公司 | A kind of LC parallel connection two-way resonance DC/DC converter and its control method |
| CN108347167A (en) * | 2017-01-25 | 2018-07-31 | 通用电气公司 | System and method for soft handover DC-DC converters |
| US11784600B2 (en) | 2017-01-25 | 2023-10-10 | General Electric Company | Systems and methods for a soft switching DC-DC converter |
| CN109742957A (en) * | 2019-02-12 | 2019-05-10 | 深圳市新能力科技有限公司 | A kind of bicyclic complex resonance type soft switch transducer |
| CN109742957B (en) * | 2019-02-12 | 2024-02-09 | 深圳市新能力科技有限公司 | Double-ring full-resonance type soft switching converter |
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Open date: 20091111 |