CN1295854C - Self-drive reset circuit for single-end ortho-excited powder source - Google Patents
Self-drive reset circuit for single-end ortho-excited powder source Download PDFInfo
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- CN1295854C CN1295854C CNB2003101018108A CN200310101810A CN1295854C CN 1295854 C CN1295854 C CN 1295854C CN B2003101018108 A CNB2003101018108 A CN B2003101018108A CN 200310101810 A CN200310101810 A CN 200310101810A CN 1295854 C CN1295854 C CN 1295854C
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- clamping capacitance
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Abstract
The present invention discloses a self-driving reset circuit of a single-end positive-exciting power supply in the field of a power supply, which comprises a primary main switch tube Q1, a clamping switch tube Q2, a clamping capacitor C1 and a current feedback device ISC1, wherein the clamping switch tube Q2 is connected with the current feedback device ISC1 and the clamping capacitor C1 in series to form a reset circuit. The reset circuit is connected in parallel to the secondary side of a transformer. The conduction phase of the clamping switch tube Q2 and the conduction phase of the primary main switch tube Q1 are mutually reverse. The clamping switch tube Q2 utilizes a secondary winding of the transformer to implement self-driving. The self-driving reset circuit solves the reset problem of the magnetic core of the transformer and nicely solves the problem of large loss when a clamping capacitor in general self-driving clamping is charged and discharged.
Description
Technical field
The present invention relates to the high frequency switch power field, relate in particular to the self-driven reset circuit of DC/DC synchronous rectification single-end ortho-exciting electric source.
Background technology
When power technology reaches its maturity, requirement for aspects such as power supply stability, ease for use and energy savings also improves day by day, wherein, DC/DC synchronous rectification single-end ortho-exciting electric source is constantly development under such demand, in DC/DC synchronous rectification single-end ortho-exciting electric source, the dc voltages that the dc voltage that the single-end ortho-exciting transducer is used for importing converts different outputs to offer load.The single-end ortho-exciting transducer usually relies on the single switch that is connected between voltage source and the former limit of the transformer winding at switch connection and when conducting electricity, the power that provides forward to carry to the auxiliary winding of transformer.In order to allow the inductive energy storage of transformer discharge, during the switch disconnection, need to make magnetic core of transformer " to reset ", adopt adjunct circuit to finish the reseting procedure of magnetic core usually.
The self-driven reset circuit of general secondary is made up of a switching tube and electric capacity usually, and switching tube directly adopts transformer secondary winding to drive.Circuit form as shown in Figure 1.Wherein Q1 is a former limit main switch, and Q2 is the clamp switch pipe, and C1 is a clamping capacitance, and Q4, Q3 are respectively output rectification, output continued flow tube, and L1 is an output inductor, and C2 is an output filter capacitor.The operation principle of this circuit is as follows: after former limit switching tube Q1 turn-offed, the magnetization energy of transformer discharged by clamp switch pipe Q2, clamping capacitance C1 from the secondary of transformer, and the voltage on the clamping capacitance raises.After dump energy had discharged, the energy on the clamping capacitance C1 returned transformer by the clamp switch pipe again, made exciting current reverse, thereby magnetic core of transformer is resetted, simultaneously the voltage V on the main switch Q1
Q1DSDescend.When the main switch conducting of former limit, because the voltage of clamping capacitance is toward the V of contact greater than clamp switch pipe Q2
GSConduction threshold, this moment, clamp switch pipe Q2 also can open a period of time, and the voltage on the clamping capacitance C1 and the series connection of transformer secondary voltage be by the Q2 heavy-current discharge, and the voltage on clamping capacitance C1 is lower than the V of Q2
GSTill the conduction threshold.Moreover, according to the voltage oscillogram of the sequential chart of available circuit Primary Component Q1, Q2 shown in Figure 2 and main switch Q1, clamping capacitance C1 as can be seen, the change in voltage amplitude of clamping capacitance is very big, and its charge-discharge energy and loss are all bigger.There is heavy-current discharge in the C1 in a flash that Q1 opens, V
C1Decline by a big margin.So just cause excessive capacitor charge and discharge loss, on the clamp switch pipe, caused bigger heating loss, reduced the efficient of power supply, also reduced the reliability of circuit.This phenomenon is more obvious when lower, the former limit of input voltage main switch driving duty ratio is bigger.
Summary of the invention
The objective of the invention is to overcome the shortcoming that the loss of power that exists in the prior art is excessive, reliability is low, in the hope of a kind of circuit that can make single-end ortho-exciting electric source magnetic core of transformer active homing, the reduction loss of power, improve power supply reliability is provided.
For achieving the above object, the present invention constructs the self-driven reset circuit of a kind of single-end ortho-exciting electric source, comprises former limit main switch Q1, it is characterized in that, also comprises clamp switch pipe Q2, clamping capacitance C1 and P channel MOS tube;
Described clamp switch pipe Q2 connects one by one with described P channel MOS tube, clamping capacitance C1, forms a reset circuit, and this reset circuit is parallel to the secondary of transformer; The conducting of the conducting of described clamp switch pipe Q2 and described former limit main switch Q1 is anti-phase each other; Described this clamp switch pipe Q2 utilizes transformer secondary winding to carry out self-driven.
The self-driven reset circuit of single-end ortho-exciting electric source proposed by the invention adopts self-driven control mode, has solved the reset issues of magnetic core of transformer, and has finely solved that clamping capacitance discharges and recharges the big problem of loss in the general self-driven clamp.When using in the DC/DC power module, power-efficient has improved 3%-5% than original efficient, because this reset circuit is simple in structure, can be directly parallel in the transformer secondary, so its application is quite easy, has reduced the loss of power, has improved the reliability of power supply.
Description of drawings
Fig. 1 is the self-driven reset circuit figure of existing a kind of secondary.
Fig. 2 is the sequential chart of the described circuit Primary Component of Fig. 1 Q1, Q2 and the voltage oscillogram of main switch Q1, clamping capacitance C1.
Fig. 3 is the self-driven reset circuit figure of single-end ortho-exciting electric source of the present invention.
Fig. 4 is the sequential chart of Primary Component Q1, Q2 among Fig. 3 and the voltage oscillogram of main switch Q1, clamping capacitance C1.
Fig. 5 is the circuit diagram as an embodiment of circuit of the present invention.
Fig. 6 is the circuit diagram as another embodiment of circuit of the present invention.
Embodiment
Below in conjunction with drawings and Examples device of the present invention is described in further detail.
The self-driven reset circuit of the single-end ortho-exciting electric source that the present invention constructed as shown in Figure 3, comprise clamp switch pipe Q2, clamping capacitance C1 and current feedback unit ISC1, its concrete annexation is as follows: switching tube Q2, current feedback unit ISC1, clamping capacitance C1 connect one by one, form a reset circuit, this reset circuit is parallel to the secondary of transformer.The conducting of the conducting of clamp switch pipe Q2 and former limit main switch Q1 is anti-phase each other.This clamp switch pipe Q2 utilizes transformer secondary winding to carry out self-driven.Its concrete operation principle is: when main switch Q1 conducting, transformer T exports energy to secondary, and this moment, clamp switch pipe Q2 was in off state.Have no progeny when main switch Q1 closes, transformer T secondary voltage oppositely raises, clamp switch pipe Q2 conducting, and the dump energy of transformer T is given clamping capacitance C1 charging by clamp switch pipe Q2 and current feedback unit ISC1, and the voltage of clamping capacitance C1 rises; After the voltage on the clamping capacitance C1 rose to certain value, the dump energy of transformer T discharged and finishes, and clamping capacitance C1 carries out resonant discharge by clamp switch pipe Q2 and current feedback unit ISC1 to the transformer secondary.When main switch Q1 transfers conducting to again, transformer secondary voltage forward raises, Voltage Series on transformer secondary voltage and the clamping capacitance C1, and by clamp switch pipe Q2 and current feedback unit ISC1 heavy-current discharge, this moment, current feedback unit ISC1 detected this heavy-current discharge signal, turn-off clamp switch pipe Q2 immediately rapidly, stop the heavy-current discharge of clamping capacitance C1, disconnected the loop of clamp circuit.Reduce the large current density electrical loss of clamping capacitance C1, improved the efficient and the reliability of power supply.
Fig. 4 is switching sequence figure and the DS pole tension oscillogram of main switch Q1 and the voltage oscillogram of clamping capacitance C1 of Primary Component Q1, the clamp switch pipe Q2 of Fig. 3 circuit, and transverse axis is the time among the figure, and the longitudinal axis of oscillogram is a voltage.As can be seen from Figure 4, the on off state of main switch Q1 and clamp switch pipe Q2 is anti-phase.Main switch Q1 closes and has no progeny, and main switch Q1 voltage is subjected to the clamp of clamping capacitance C1, and the trend that discharges and recharges of variation tendency and clamping capacitance C1 is identical.Dotted line waveform is the clamping capacitance C1 charging and discharging curve in the comparison diagram 2 among Fig. 4, comes as can be seen in the present invention, and the charging and discharging curve of clamping capacitance is comparatively mild, and it is much smaller to discharge and recharge loss.
Fig. 5 is one embodiment of the present of invention, wherein Q1 is a main switch, T is a transformer, Q4, Q3 are respectively output synchronous rectifier, output synchronous freewheeling pipe, and L1 is a filter inductance, and C2 is a filter capacitor, C1 is a clamping capacitance, R1 is a discharge examination resistance, and Q2 is the clamp switch pipe, and Q5 is the current feedback pipe.The effective N-channel MOS pipe of the clamp switch of present embodiment, current feedback unit P channel MOS tube Q5.The drain electrode of described clamp switch pipe Q2 links to each other with the in-phase end of described transformer T secondary, source electrode links to each other with an end of described detection resistance R 1, the other end of described detection resistance links to each other with described clamping capacitance C1 one end, and grid links to each other with the end of oppisite phase of described transformer T secondary.The end of oppisite phase of the drain electrode of described P channel MOS tube Q5 and described transformer T secondary joins, and the source electrode of described P channel MOS tube links to each other with the other end of clamping capacitance C1, and the in-phase end of the grid of described P channel MOS tube Q5 and described transformer T secondary joins.
When former limit main switch Q1 was in off state, transformer secondary reverse voltage made clamp switch pipe Q2 and P channel MOS tube Q5 open-minded, and the magnetic core of the line transformer of going forward side by side resets.
When former limit main switch Q1 transferred conducting to by shutoff, transformer secondary voltage forward raise, the Voltage Series on secondary voltage and the clamping capacitance C1, and, on R1, produce a pressure drop V by clamp switch pipe Q2 and P channel MOS tube Q5 and R1 heavy-current discharge
R1, the V of Q2
GSVoltage equals the voltage V on the clamping capacitance C1
C1Deduct the pressure drop V on the Q5
DS, deduct the pressure drop V of R1 again
R1,, can make the V of Q2 by selecting suitable resistance R 1
GSVoltage is reduced to very soon less than below the Q2 conduction threshold, allows Q2 turn-off; After Q2 turn-offs, also cut off C1 and be added in the voltage circuit that the GS of Q5 extremely goes up by Q2, like this, Q5 also is turned off, and C1 is added in the voltage circuit that the GS of Q2 extremely goes up by Q5 and is also continued to have turn-offed.So Q2 and Q5 keep off state always, turn-off up to Q1, the transformer secondary voltage is opened Q2 and Q5 after oppositely raising once more.
After Q2 and Q5 end, just disconnected the heavy-current discharge loop of clamping capacitance C1.Reduce the large current density electrical loss of clamping capacitance C1, realized purpose of the present invention, improved the efficient and the reliability of power supply.Choosing of R1 should be moderate, the speed of the too little current detecting that will slow down, and the charging and discharging currents of C1 is still very big; The R1 resistance can cause the damping in loop too big again too greatly, produces too much heat energy loss on R1.Can comparatively fast turn-off Q2 to open moment at Q1 when choosing, the C1 voltage falling is not obvious to be as the criterion.
Fig. 6 is the another kind of embodiment of this patent, and on the basis of Fig. 5, resistance R 1 is omitted, and by selecting the slightly bigger Q5 of conducting resistance, replaces the effect of the current detecting of R1 among Fig. 5.Like this, the V of Q2
GSVoltage equals the voltage V on the clamping capacitance C1
C1Deduct the pressure drop V on the Q5
DS,, also can make the V of Q2 in the moment that former limit metal-oxide-semiconductor Q1 opens
GSThe very fast decline of voltage reduces the heavy current discharging time of clamping capacitance C1 and discharges and recharges loss.
Claims (3)
1, the self-driven reset circuit of a kind of single-end ortho-exciting electric source comprises former limit main switch (Q1), it is characterized in that, also comprises clamp switch pipe (Q2), transformer (T), clamping capacitance (C1) and P channel MOS tube;
Described clamp switch pipe (Q2) is connected one by one with described P channel MOS tube, clamping capacitance (C1), forms a reset circuit, and this reset circuit is parallel to the secondary of transformer; The conducting of the conducting of described clamp switch pipe (Q2) and described former limit main switch (Q1) is anti-phase each other; Described this clamp switch pipe (Q2) utilizes transformer (T) secondary winding to carry out self-driven.
2, the self-driven reset circuit of single-end ortho-exciting electric source according to claim 1 is characterized in that, also comprises output synchronous rectifier (Q4), output synchronous freewheeling pipe (Q3), filter inductance (L1), filter capacitor (C2) and discharge examination resistance (R1);
The drain electrode of described clamp switch pipe (Q2) links to each other with the in-phase end of described transformer (T) secondary, source electrode links to each other with an end of described discharge examination resistance (R1), the other end of described discharge examination resistance (R1) links to each other with described clamping capacitance (C1) end, and grid links to each other with the end of oppisite phase of described transformer (T) secondary; The end of oppisite phase of the drain electrode of described P channel MOS tube and described transformer (T) secondary joins, and source electrode links to each other with the other end of described clamping capacitance (C1), and the in-phase end of grid and described transformer (T) secondary joins.
3, according to claim 1 or the self-driven reset circuit of 2 described single-end ortho-exciting electric sources, it is characterized in that described clamp switch pipe (Q2) is used the N-channel MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101018108A CN1295854C (en) | 2003-10-17 | 2003-10-17 | Self-drive reset circuit for single-end ortho-excited powder source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101018108A CN1295854C (en) | 2003-10-17 | 2003-10-17 | Self-drive reset circuit for single-end ortho-excited powder source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1529402A CN1529402A (en) | 2004-09-15 |
| CN1295854C true CN1295854C (en) | 2007-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101018108A Expired - Lifetime CN1295854C (en) | 2003-10-17 | 2003-10-17 | Self-drive reset circuit for single-end ortho-excited powder source |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441146A (en) * | 1982-02-04 | 1984-04-03 | Vicor Corporation | Optimal resetting of the transformer's core in single ended forward converters |
| US6278621B1 (en) * | 1996-07-18 | 2001-08-21 | International Power Devices, Inc. | Single ended forward DC-to-DC converter providing enhanced resetting for synchronous rectification |
| CN1332513A (en) * | 2000-09-28 | 2002-01-23 | 深圳市中兴通讯股份有限公司 | Positively exciting circuit unit |
-
2003
- 2003-10-17 CN CNB2003101018108A patent/CN1295854C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441146A (en) * | 1982-02-04 | 1984-04-03 | Vicor Corporation | Optimal resetting of the transformer's core in single ended forward converters |
| US6278621B1 (en) * | 1996-07-18 | 2001-08-21 | International Power Devices, Inc. | Single ended forward DC-to-DC converter providing enhanced resetting for synchronous rectification |
| CN1332513A (en) * | 2000-09-28 | 2002-01-23 | 深圳市中兴通讯股份有限公司 | Positively exciting circuit unit |
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| Publication number | Publication date |
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| CN1529402A (en) | 2004-09-15 |
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Granted publication date: 20070117 |