CN201018412Y - Novel current type whole bridge digital power supply - Google Patents
Novel current type whole bridge digital power supply Download PDFInfo
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- CN201018412Y CN201018412Y CNU2006200957502U CN200620095750U CN201018412Y CN 201018412 Y CN201018412 Y CN 201018412Y CN U2006200957502 U CNU2006200957502 U CN U2006200957502U CN 200620095750 U CN200620095750 U CN 200620095750U CN 201018412 Y CN201018412 Y CN 201018412Y
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Abstract
The utility model relates to a novel current mode full-bridge digital power which comprises an input rectification circuit, a digital control circuit, a DC or DC level power converter and an auxiliary power supply and is characterized in that the utility model is an alternating current or direct current (AC or DC) isolated power converter which adopts the circuit of the current mode golden bridge topology structure and realizes the correction of the single-stage power factor through the powerful calculation and control capabilities of a digital signal processor.
Description
Technical field
The utility model relates to field of power electronics and digital processing field, and in particular, it is a kind of digital power of novel employing current mode full-bridge topologies.
Background technology
Extensively adopt the isolating switch power of band power factor correction to adopt traditional two-stage type power factor correction technology often at present, but its circuit structure complexity, power supply conversion efficiency is relatively low.In order to overcome these shortcomings, some single-stage power factor correcting circuits occurred, but, therefore can not have been promoted on a large scale and use owing in use there are various scarce limits.Current mode full-bridge converter＜see calendar year 2001 " theoretical foundation of soft switch BOOST PWM DC/DC full-bridge converter " that " the 14 national power supply nd Annual Meeting collection " includes wherein〉be subjected to many scholars' attention. this converter using the current mode full-bridge topologies, both can realize power factor correction, the DC/DC conversion, input and output voltage is isolated, also can realize boosting or step-down output. its shortcoming is that the control mode that this circuit requires is also different when different operating states, conventional power supply control chip can't satisfy its control needs.
Summary of the invention
Content of the present utility model provides a kind of New type of current type full-bridge digital power, this power supply has adopted DSP CONTROL, at the different operating state of power supply and adopt different control modes, it is low that this power supply has switch tube voltage stress, the power supply conversion efficiency height can be realized power factor correction, is applicable to high-power output occasion, this power supply can be operated in boost inductance electric current continuation mode (CCM), also can be operated in the discontinuous mode of boost inductance electric current (DCM).In addition, the present invention has also overcome microprocessor and has been used for Switching Power Supply when control, easily the upper and lower bridge arm shoot through takes place and the phenomenon of burning power tube under microprocessor state uncertain condition.
The realization the technical solution of the utility model is: a kind of New type of current type full-bridge digital power, it is characterized in that: by city bridge rectifier circuit D9-D12, boost inductance L1, four power field effect pipe Q1-Q4, every straight balancing capacitance C8, transformer T1, accessory power supply 1, digital control circuit 2, transformer secondary synchronous rectification circuit Q5, Q6, C9 forms, the end of boost inductance L1 is connected to the cathode output end of city's bridge rectifier circuit, the other end of boost inductance L1 is connected to the drain electrode of power field effect pipe Q1 and the drain electrode of power field effect pipe Q2, the source electrode of the source electrode of power field effect pipe Q3 and power field effect pipe Q4 is connected to the cathode output end of city's bridge rectifier circuit, the former limit winding of transformer is with behind straight balancing capacitance C8 polyphone, one end is connected to the drain electrode of source electrode and the power field effect pipe Q3 of power field effect pipe Q1, the other end is connected to the drain electrode of source electrode and the power field effect pipe Q4 of power field effect pipe Q2, the digital control circuit of power supply has four outputs to be connected respectively to the grid of four power field effect pipe Q1-Q4, digital control circuit also has two outputs to be connected to synchronous rectifier Q5, the grid of Q6, transformer secondary winding has centre tap, this centre tap is the positive pole of secondary rectification output dc voltage, the two ends tap of transformer secondary winding is connected respectively to the drain electrode of power field effect pipe Q5 and the drain electrode of power field effect pipe Q6, and the source electrode of the source electrode of power field effect pipe Q5 and power field effect pipe Q6 is connected the negative pole of back as secondary rectification output dc voltage.
Described a kind of New type of current type full-bridge digital power is characterized in that circuit has adopted diode D7, D8 and resistance R 2, the line voltage sample circuit that R3 forms.
Described a kind of New type of current type full-bridge digital power, it is characterized in that circuit has adopted by diode D13, the low-loss buffer circuit that D14 and resistance R 1 are formed, in this low-loss buffer circuit, must be longer than the turn-off time of power field effect pipe Q1-Q4 the reverse recovery time of diode D14.
Described a kind of New type of current type full-bridge digital power, it is characterized in that circuit has adopted diode D16, the current detection circuit that D17 forms, the anode of diode is by moving the reference power supply of A/D sampling on the resistance, its operation principle is to have utilized power field effect pipe equivalent resistance between conducting hourglass source electrode to be this characteristic of definite value, in circuit, diode D16, must be shorter than the turn-off time of power field effect pipe Q1-Q4 the reverse recovery time of D17.
Described a kind of New type of current type full-bridge digital power is characterized in that dc output circuit can also adopt as shown in Figure 2 by diode D5, full-wave rectifying circuit and dual form thereof that D6 forms, i.e. and diode D5, D6 oppositely connects.
Described a kind of New type of current type full-bridge digital power, it is characterized in that forward and the reverse volt of current mode full-bridge topologies to former limit winding, second, value had certain balanced action, when low-power applications or employing pressure balance magnetic flux density method, can cancel every straight balancing capacitance C8.
Described a kind of New type of current type full-bridge digital power is characterized in that this power supply has the external digital interface, can be used for realizing showing that data transmit and controlled function.
Description of drawings
Fig. 1 is an electrical block diagram of the present utility model;
Fig. 2 is an operation mode explanation schematic diagram of the present utility model;
Fig. 3 is interior main waveform corresponding diagram of work period of the utility model.
Embodiment
The basic topological structure of this circuit is the current mode full-bridge converter, the switching mode that clinodiagonal two power switch pipes of this converter using stagger opening time, V among the figure
InBe the direct voltage after the rectification, L1 is a boost inductance, and Q1-Q4 is four switching tubes, and T1 is a main transformer, D5, and D6, C9 forms output rectification circuit, Q1﹠amp; Q4 Q2﹠amp; Q3 in a switch periods respectively with greater than 50%, but less than 100% duty ratio alternate conduction and shutoff.
Process for simplifying the analysis, make the following assumptions specially: the transformer magnetizing current is ignored, because output filter capacitor is enough big, therefore output can be regarded constant pressure source as.And to establish the synchronous rectification drive signal be zero, remove relevant auxiliary circuit, can be derived by Fig. 1 draws Fig. 2, and when supply convertor was in normal steady-working state and continuous operation mode (CCM), a complete work period can be divided into eight operation mode (see figure 3)s.
1, mode 1:(t0-t1 constantly), t0 opens Q2 constantly, because the existence of the former limit of transformer winding leakage inductance, the former limit of transformer winding current Ip and boost inductance electric current I L can not suddenly change opening moment, therefore Q2 is zero at conducting moment drain-source electrode current, has realized zero current turning-on.In this mode, Q1, Q2, the Q4 conducting, Q3 turn-offs, and four power tube source-drain electrode voltage V1-V4 are zero, input voltage directly is added in boost inductance L1 two ends, be equivalent in the basic Boost converter power supply to the charged state of boost inductance, boost inductance electric current I L is linear to rise, and transformer primary current I p is zero, transformer original edge voltage Vb is zero, output rectifier diode D5, D6 ends, and load provides energy by filter capacitor C9.
2, mode 2:(t1-t2 is constantly), t1 opens Q3 constantly, because four power tube voltage V1-V4 are zero entirely, so Q3 is that no-voltage is open-minded.In this mode, the whole conductings of Q1-Q4, boost inductance electric current I L continues linear the rising.
3, mode 3:(t 2-t 3 is constantly), t2 turn-offs Q4 constantly, because four power tube voltage V1-V4 are zero entirely, so Q4 is that no-voltage is turn-offed.In this mode, the Q1-Q3 conducting, Q4 turn-offs, and boost inductance electric current I L continues linear the rising.
4, mode 4:(t3-t4 is constantly), t3 turn-offs Q1 constantly, because the capacity effect between power field effect pipe drain electrode and the source electrode, the voltage V1 at electric capacity two ends can not suddenly change, so Q1 is that no-voltage is turn-offed.In this mode, Q2, the Q3 conducting, Q1, Q4 turn-off, and the energy in electrical network and the boost inductance powers to the load simultaneously, the secondary current Io rectifying tube D5 that flows through, electric current I L is linear among the boost inductance L1 descends.At this moment, original edge voltage Vb=nVo, V1=V4=Vb, V2=V3=0, primary current Ip=IL, wherein n is the former of high frequency transformer, the turn ratio between secondary.
5, the mode 5:(t4-t5 moment) t4 opens Q1 constantly, because the existence of the former limit of transformer winding leakage inductance, the former limit of transformer winding current Ip and boost inductance electric current I L can not suddenly change opening moment, thus Q1 conducting constantly the drain-source electrode current be zero, realized zero current turning-on.In this mode, the Q1-Q3 conducting, Q4 turn-offs, because former limit winding voltage is zero, the secondary output voltage is added in primary current Ip linearity is reduced.Electric current among the Q2 shifts to Q1, and the electric current among the Q1 is from the zero line rising, input voltage directly is added in boost inductance L1 two ends, be equivalent in the basic Boost converter power supply to the charged state of boost inductance, boost inductance electric current I L is linear to rise, the output current Io of rectifier diode D5 also is reduced to zero, turn-offs naturally, does not have reverse-recovery problems.
6, mode 6:(t5-t6 is constantly), t5 opens Q4 constantly, and the working method of this mode is identical with mode 2, and boost inductance electric current I L continues to rise.
7, mode 7:(t6-t7 is constantly), t6 turn-offs Q3 constantly, and the working method of this mode is identical with mode 3, and boost inductance electric current I L continues to rise.
8, mode 8:(t7-t8 is constantly), t7 turn-offs Q2 constantly, because the capacity effect between power field effect pipe drain electrode and the source electrode, the voltage V2 at electric capacity two ends can not suddenly change, so Q2 is that no-voltage is turn-offed.In this mode, Q1, the Q4 conducting, Q2, Q3 turn-off, and the energy in electrical network and the boost inductance powers to the load simultaneously, the secondary current Io rectifying tube D6 that flows through.After the moment, the power work mode enters mode 1 through t8, and converter begins the work in another cycle again.
9, circuit of synchronous rectification driving employing program is dynamically controlled, when electric current in the boost inductance continuously when (CCM), digital control circuit provides corresponding synchronous rectification field effect transistor drive signal, when electric current is discontinuous in the boost inductance (DCM), digital control unit is closed synchronous rectification field effect transistor drive signal, and utilizes backward diode in parallel in the synchronous rectification field effect transistor to carry out full-wave rectification output.
Claims (5)
1. New type of current type full-bridge digital power, it is characterized in that: by city's bridge rectifier circuit (D9-D12), boost inductance (L1), four power field effect pipes (Q1-Q4), power field effect pipe current measurement circuit (D16, D17), line voltage sample circuit (D7, D8, R2, R 3), low-loss buffer circuit (D13, D14, R1), every straight balancing capacitance (C8), transformer (T1), accessory power supply (1), digital control circuit (2), transformer secondary synchronous rectification circuit (Q5, Q6, C9) form, one end of boost inductance (L1) is connected to the cathode output end of city's bridge rectifier circuit, the other end of boost inductance (L1) is connected to the drain electrode of power field effect pipe (Q1) and the drain electrode of power field effect pipe (Q2), the source electrode of the source electrode of power field effect pipe (Q3) and power field effect pipe (Q4) is connected to the cathode output end of city's bridge rectifier circuit, the former limit winding of transformer is with behind straight balancing capacitance (C8) polyphone, one end is connected to the drain electrode of the source electrode and the power field effect pipe (Q3) of power field effect pipe (Q1), the other end is connected to the drain electrode of the source electrode and the power field effect pipe (Q4) of power field effect pipe (Q2), the digital control circuit of power supply has four outputs to be connected respectively to the grid of four power field effect pipes (Q1-Q4), digital control circuit also has two outputs to be connected to synchronous rectifier (Q5, Q6) grid, transformer secondary winding has centre tap, this centre tap is the positive plate of secondary rectification output dc voltage, the two ends tap of transformer secondary winding is connected respectively to the drain electrode of power field effect pipe (Q5) and the drain electrode of power field effect pipe (Q6), and the source electrode of the source electrode of power field effect pipe (Q5) and power field effect pipe (Q6) is connected the negative pole of back as secondary rectification output dc voltage.
2. a kind of New type of current type full-bridge digital power according to claim 1 is characterized in that circuit has adopted diode (D7), (D8) and resistance (R2), (R3) the line voltage sample circuit of Zu Chenging.
3. a kind of New type of current type full-bridge digital power according to claim 1 is characterized in that circuit has adopted by diode (D13), (D14) and the low-loss buffer circuit formed of resistance (R1), in this low-loss buffer circuit, the turn-off time that must be longer than power field effect pipe (Q1-Q4) reverse recovery time of diode (D14).
4. a kind of New type of current type full-bridge digital power according to claim 1, it is characterized in that circuit has adopted diode (D16), (D17) current detection circuit of Zu Chenging, the anode of diode is by moving the reference power supply of A/D sampling on the resistance, in circuit, diode (D16), must be shorter than the turn-off time of power field effect pipe (Q1-Q4) reverse recovery time (D17).
5. a kind of New type of current type full-bridge digital power according to claim 1 is characterized in that this power supply has the external digital interface, can be used for realizing showing that data transmit and controlled function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200957502U CN201018412Y (en) | 2006-03-23 | 2006-03-23 | Novel current type whole bridge digital power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200957502U CN201018412Y (en) | 2006-03-23 | 2006-03-23 | Novel current type whole bridge digital power supply |
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| CN201018412Y true CN201018412Y (en) | 2008-02-06 |
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| CNU2006200957502U Expired - Fee Related CN201018412Y (en) | 2006-03-23 | 2006-03-23 | Novel current type whole bridge digital power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707838B (en) * | 2009-12-04 | 2012-11-21 | 英飞特电子（杭州）股份有限公司 | Multipath LED constant current drive circuit suitable for non-isolated converter |
| CN103475197A (en) * | 2013-09-10 | 2013-12-25 | 江苏银佳企业集团有限公司 | Digital switching power supply including feedback element and working method thereof |
| WO2014071674A1 (en) * | 2012-11-09 | 2014-05-15 | 联合汽车电子有限公司 | Direct-current isolation buck convertor and bus voltage detection circuit thereof |
| CN107171544A (en) * | 2017-05-23 | 2017-09-15 | 杭州电子科技大学 | A kind of full digital full-bridge isolated single-phase single-grade PFC（PFC）Converter |
-
2006
- 2006-03-23 CN CNU2006200957502U patent/CN201018412Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707838B (en) * | 2009-12-04 | 2012-11-21 | 英飞特电子（杭州）股份有限公司 | Multipath LED constant current drive circuit suitable for non-isolated converter |
| WO2014071674A1 (en) * | 2012-11-09 | 2014-05-15 | 联合汽车电子有限公司 | Direct-current isolation buck convertor and bus voltage detection circuit thereof |
| CN103475197A (en) * | 2013-09-10 | 2013-12-25 | 江苏银佳企业集团有限公司 | Digital switching power supply including feedback element and working method thereof |
| CN107171544A (en) * | 2017-05-23 | 2017-09-15 | 杭州电子科技大学 | A kind of full digital full-bridge isolated single-phase single-grade PFC（PFC）Converter |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 |