CN103780065A - Soft turn-off power supply converter - Google Patents
Soft turn-off power supply converter Download PDFInfo
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- CN103780065A CN103780065A CN201410070471.XA CN201410070471A CN103780065A CN 103780065 A CN103780065 A CN 103780065A CN 201410070471 A CN201410070471 A CN 201410070471A CN 103780065 A CN103780065 A CN 103780065A
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Abstract
The invention provides a soft turn-off power supply converter. The soft turn-off power supply converter comprises a transformer, wherein the transformer is connected between an input power supply and an output power supply; a primary winding of the transformer and a negative end of the input power supply are connected in series with a circuit control switch; the circuit control switch is switched on and switched off under the condition of output signals of a PWM (Pulse-Width Modulation) control circuit; a branch, which is connected in series with a second capacitor, a rectifying diode and a first capacitor, is also connected between the primary winding of the transformer and the negative end of the input power supply; and a voltage control switch is controlled by a soft turn-off control circuit. Through the soft turn-off power supply converter, the problem of great loss caused due to hard turn-off of the switch can be solved; the soft turn-off is realized; the loss of the switch is reduced; the efficiency is improved; meanwhile, the problem of the power supply in operation of the control circuit and the problem of absorption of turn-off peak voltage of the switch are also solved; a power supply circuit and an absorption circuit are not required to be arranged in the power supply converter again, so that the circuit structure is simplified.
Description
Technical field
The present invention relates to the control technology field of electronic circuit, particularly relate to a kind of power ratio control switch and realize the supply convertor of soft shutoff.
Background technology
At present, in single ended power supply converter, because there is leakage inductance in transformer, switching tube in supply convertor can produce very high reverse voltage spike at switching tube two ends while shutoff, likely exceed the withstand voltage of switching tube and switching tube is damaged, and single ended power supply converter, in order to improve conversion efficiency, must make switching tube realize soft switch and could reduce switching loss.
It is open-minded that the single ended power supply converter of known quasi-resonance QR pattern can only be realized no-voltage, switching tube remains hard shutoff, turn-off power loss is larger, supply convertor conversion efficiency is low, and transformer leakage inductance energy storage still needs to adopt conventional a kind of RCD absorbing circuit structure chart with absorption function as shown in accompanying drawing Fig. 4 to absorb, leakage inductance energy storage is dumped in capacitor C and by resistance R and consumes a part, and electric energy is also had no the waste of benefit.
The circuit of the turn-off power loss of existing reduction switching tube mainly contains a kind of RCD absorbing circuit with absorption and soft turn-off function shown in active clamp circuit and accompanying drawing 3, active clamp technology can reduce the shutoff voltage spike of switching tube greatly, voltage and current product while making the shutoff of switching tube reduces, thereby turn-off power loss is reduced, but the soft shutoff DeGrain of switching tube, the turn-off power loss of switching tube cannot further reduce, in the absorbing circuit of RCD shown in Fig. 3, in the switching tube shutoff phase, supply voltage and leakage inductance peak voltage are superimposed and charge to capacitor C through the armature winding of diode D and transformer, capacitor C both end voltage rising, now, in switching tube turn off process, electric current sharply declines, thereby make the overlapping region of voltage and current very little, be that power loss is little, switching tube is soft shutoff, within the switching tube conducting phase, the energy storage of capacitor C is through resistance R and switching tube electric discharge, electric energy consumes a part in resistance R, the terminal voltage of capacitor C is declined, for absorbing leakage inductance energy storage within next cycle, capacitor C prepares, under this pattern, electric energy is still had no the waste of benefit, the electric energy that the electric energy that even resistance consumption falls is saved because of soft shutoff than switching tube is much more, advocating energy-conservation today, make sort circuit lose use value.
And the control circuit in current supply convertor needs externally fed to work, general adopt other independent small power supply, standby power to power, or power supply winding is set in transformer auxiliary power supply is provided, make power supply more complicated, waste electronic material, cost is high.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide that a kind of switching loss is low, efficiency is high, the simple soft power cutoff converter of circuit.
For solving the problems of the technologies described above, technical scheme provided by the invention is: a kind of soft power cutoff converter, comprise the transformer being connected between input power and out-put supply, the armature winding of the transformer circuit controling switch of connecting with input power negative terminal, described circuit controling switch is by the output signal control break-make of a pwm control circuit, also comprise a soft voltage cut-out that switches off control circuit and control, described voltage cut-out one end connects the positive pole of rectifier diode, and the other end connects input power negative pole; Between the armature winding of described transformer and input power negative terminal, be also connected a branch road of being connected successively by the second electric capacity, rectifier diode and the first electric capacity; described the first electric capacity and the second electric capacity charge within the circuit controling switch shutoff phase; for pwm control circuit and soft switch off control circuit operating voltage is provided, make the soft shutoff of circuit controling switch simultaneously and suppress the reverse voltage spike at circuit controling switch two ends;
Described soft switch off control circuit comprise successively the magnitude of voltage after the 3rd resistance and the 4th electric resistance partial pressure by the first electric capacity two ends that connects and reference voltage relatively and the first comparator of the error voltage value of output after amplifying, by the ramp voltage producing from a slope generating circuit and described error voltage value relatively and export the second comparator of burst pulse, the input end signal of described slope generating circuit is the output signal of pwm control circuit, described burst pulse exports the control end of described voltage cut-out to after one first inverter and one second inverter, and control fast voltage cut-out conducting and close, soft switch off control circuit be controlled at the ON time of voltage cut-out in circuit controling switch conduction period according to the voltage of the first electric capacity of the 3rd resistance and the 4th resistance detection, with the second electric capacity lotus of charging within the circuit controling switch shutoff phase of voltage cut-out series connection part of being released, restore circuit control switch is at the soft turn-off function of next switch periods.。
Described input power anode connects the tie point of the first electric capacity and rectifier diode by the first resistance, for pwm control circuit and soft switch off control circuit the operating current of initial start is provided.
Described voltage cut-out is made up of the first field effect transistor and the second field effect transistor and the 5th resistance, one end of the grid of the grid of described the first field effect transistor and the second field effect transistor and the 5th resistance is connected in the output of the second inverter, the source electrode of the source electrode of the first field effect transistor and the second field effect transistor (34) and the other end of the 5th resistance be connected in the second inverter power supply hold, the drain electrode of described the first field effect transistor connects the node of the second electric capacity and rectifier diode, and the drain electrode of the second field effect transistor connects the soft power supply switching off control circuit and holds.
The other end of circuit controling switch is by the second grounding through resistance, and described pwm control circuit is electrically connected with circuit controling switch by current detecting input and drive output, simultaneously by FB input input and output voltage error feedback signal.
The pulse signal of the input input of slope generating circuit is the pulse train synchronous with the drive waveforms of circuit controling switch.
Described circuit controling switch is transistor and field effect transistor and wherein any composition of igbt.
Compared with prior art, tool of the present invention has the following advantages:
The invention provides a kind of soft power cutoff converter, adopt the shutoff of pwm control circuit control switch and by the soft control voltage cut-out that switches off control circuit, and first electric capacity and rectifier diode, the regulating action of the series arm of the second electric capacity to circuit voltage, solve switch because of the hard large problem of loss of bringing of turn-offing, realize soft shutoff, reduce switching loss, improve efficiency, the absorption problem of the powerup issue while simultaneously also having solved control circuit work and the shutoff peak voltage of switch, make supply convertor without power supply circuits and absorbing circuit are set again, simplify circuit structure.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of one embodiment of the present invention;
Fig. 2 is the soft concrete implementing circuit structured flowchart switching off control circuit in the present invention;
Fig. 3 is known a kind of RCD absorbing circuit structure chart with absorption and soft turn-off function;
Fig. 4 is known a kind of RCD absorbing circuit structure chart with absorption function.
Embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing and embodiment, the present invention is explained in further detail.
embodiment 1
As shown in Figure 1, 2, a kind of soft power cutoff converter, comprises the first electric capacity 7, the second electric capacity 11, rectifier diode 10, circuit controling switch 3, voltage cut-out 9, softly switches off control circuit 8, the first resistance 1, the second resistance 4, the 3rd resistance 5, the 4th resistance 6, pwm control circuit 2, transformer 12, input power anode and negative terminal.Armature winding 13 one end electrical connections of one end of the anode of described input power and the first resistance 1 and transformer 12, armature winding 13 other ends of one end of the second electric capacity 11 and transformer 12 and one end 21 of circuit controling switch 3 are electrically connected, and the other end 31 of the other end of the second electric capacity 11 and rectifier diode 10 anodes and voltage cut-out 9 is electrically connected, the other end of anode respectively with the first resistance 1 of the first electric capacity 7, the power positive end 15 of pwm control circuit 2, soft 8 the power positive end 23 of switching off control circuit, one end electrical connection of the negative electrode of rectifier diode 10 and the 3rd resistance 5, the negative terminal of the first electric capacity 7 respectively with the negative terminal of input power, the power supply ground end 18 of pwm control circuit 2, softly switch off control circuit 8 power supply and hold 26, one end 32 of voltage cut-out 9, one end electrical connection of one end of the second resistance 4 and the 4th resistance 6, the other end of the other end of the 3rd resistance 5 and the 4th resistance 6 and soft 8 the input 25 of switching off control circuit are electrically connected, soft switch off control circuit 8 control signal output 27 and the control end 29 of voltage cut-out 9 are electrically connected, soft switch off control circuit 8 control signal output and hold 28 and the mid point 30 of voltage cut-out 9 be electrically connected, the current detecting input 19 of the other end 22 of circuit controling switch 3 and the other end of the second resistance 4 and pwm control circuit 2 is electrically connected, and the control end 20 of circuit controling switch 3 and the drive output 17 of pwm control circuit 2 are electrically connected, the signal output part 16 of pwm control circuit 2 and soft 8 the input 24 of switching off control circuit are electrically connected, it is output voltage error feedback signal input that 14 ends of pwm control circuit 2 connect FB end.
Described soft switch off control circuit 8 at least comprise the second comparator 38, the first comparator 39, the second inverter 36, the first inverter 37 and slope generating circuit 40; Described voltage cut-out 9 is made up of field effect transistor 33 and field effect transistor 34 and resistance 35.The power positive end 50 of soft 8 power positive end 23 respectively with the second comparators 38 of switching off control circuit, the power positive end 44 of the first comparator 39, the power positive end 58 of the second inverter 36, power positive end 55 and slope generating circuit 40 power positive ends 42 of the first inverter 37 are electrically connected, hold 52 the power supply of soft 26 respectively with the second comparators 38 that switch off control circuit 8 power supply and hold, hold 45 the power supply of the first comparator 39, hold 54 the power supply of the first inverter 37, hold slope generating circuit 40 power supplys 43 and the drain electrode end 32 of field effect transistor 34 be electrically connected; An input of the first comparator 39 is another input and the reference voltage V ref electrical connection of soft 8 input 25, the first comparators 39 of switching off control circuit; The input of slope generating circuit 40 is soft 8 the input 24 of switching off control circuit, an input 49 of the output 41 of slope generating circuit 40 and the second comparator 38 is electrically connected, another input 48 of the second comparator 38 and the output 47 of the first comparator 39 are electrically connected, and the output 51 of the second comparator 38 and the input 53 of the first inverter 37 are electrically connected; The output 56 of the first inverter 37 and the input 57 of the second inverter 36 are electrically connected, the output ground end that the output of the second inverter 36 is soft 8 control signal output 27, the second inverters 36 of switching off control circuit is and softly switches off control circuit 8 output and hold 28; The tie point of one end of the grid of the grid of field effect transistor 33 and field effect transistor 34 and resistance 35 is voltage cut-out 9 control ends 29, and the tie point of the source electrode of the source electrode of field effect transistor 33 and field effect transistor 34 and the other end of resistance 35 is the mid point 30 of voltage cut-out 9.
Wherein switch 3 is transistor and field effect transistor and wherein any composition of igbt.
When circuit working, in the circuit structure block diagram of the supply convertor of soft shutoff of the present invention shown in Fig. 1, the first resistance 1 provides pwm control circuit 2 and soft 8 the initial start operating current of switching off control circuit, within the 3 shutoff phases of circuit controling switch, input supply voltage adds that the reverse voltage that transformer leakage inductance energy storage produces charges to the first electric capacity 7 through the second electric capacity 11 and transformer 12 armature windings and rectifier diode 10, the voltage of the first electric capacity 7 is as pwm control circuit 2 and soft 8 the operating voltage of switching off control circuit, a part for leakage inductance energy storage is converted into pwm control circuit 2 and soft 8 the work energy of switching off control circuit, simultaneously, circuit controling switch 3 because of leakage inductance energy storage produce reverse spike voltage also will be absorbed by the first electric capacity 7 and the second electric capacity 11, the reverse voltage spike at circuit controling switch 3 two ends is inhibited, within the 3 conducting phases of circuit controling switch, the 9 a bit of times of conducting of voltage cut-out, ON time will be determined according to the soft voltage that switches off control circuit 8 the first electric capacity 7 that detect through the 3rd resistance 5 and the 4th resistance 6, make electric charge that the second electric capacity 11 stores through circuit controling switch 3 and voltage cut-out 9 part of releasing, the second electric capacity 11 both end voltage will decline, in the time that circuit controling switch 3 turn-offs again, the both end voltage of the series arm of the second electric capacity 11 and rectifier diode 10 and the first electric capacity 7 can not be suddenlyd change, the second electric capacity 11 both end voltage can only rising, cause circuit controling switch 3 both end voltage also with regard to rising, realize the soft shutoff object of switch.Voltage cut-out 9 ON time are determined by the voltage of the first electric capacity 7, therefore, the energy of the discharge loop consumption of circuit controling switch 3 and voltage cut-out 9 and the second electric capacity 11 be with the first electric capacity 7 the pwm control circuit that offers 2 and soft 8 the work energy of switching off control circuit be correlated with, the electric energy that the first electric capacity 7 consumes is few, the first electric capacity 7 both end voltage will slightly rise, after soft 8 processing that switch off control circuit, make voltage cut-out 9 ON time reduce, the energy that the discharge loop of circuit controling switch 3 and voltage cut-out 9 and the second electric capacity 11 consumes also will reduce, in prior art situation, the electric energy that the control circuit of general supply convertor consumes is in the level of tens milliwatts, therefore, the energy of the discharge loop consumption of circuit controling switch 3 and voltage cut-out 9 and the second electric capacity 11 also maintains the level of tens milliwatts, realize low-loss leakage inductance energy storage absorption function.
Wherein soft of the circuit structure block diagram of the supply convertor of soft shutoff of the present invention shown in Fig. 1 switch off control circuit 8 and a kind of more specific circuit structure block diagram of voltage cut-out 9 as shown in Figure 2, soft switch off control circuit 8 at least comprise the second comparator 38, the first comparator 39, the second inverter 36, the first inverter 37 and slope generating circuit 40; Described voltage cut-out 9 is made up of field effect transistor 33 and field effect transistor 34 and resistance 35.Wherein, what the input 25 of the first comparator 39 was inputted is the magnitudes of voltage of the first electric capacity 7 both end voltage shown in Fig. 1 after the 3rd resistance 5 and the 4th resistance 6 dividing potential drops, with the reference voltage V ref comparison of another input 46 of the first comparator 39, the error voltage value after output 47 outputs of the first comparator 39 are amplified is also input to the input 48 of the second comparator 38; what the input 24 of slope generating circuit 40 was inputted is the synchronous pulse train of output 16 drive waveforms that export and drive circuit control switch 3 of pwm control circuit 2, after slope generating circuit 40 is processed output 41 generate forward position slow after along steep and with the driving pulse of circuit controling switch 3 with ramp voltage frequently, the pulse duration of ramp voltage is also identical with the driving pulse of circuit controling switch 3, this ramp voltage is input to the error voltage value comparison of the input 49 of the second comparator 38 and the input 48 of the second comparator 38, output 51 at the second comparator 38 will be exported burst pulse, pulse duration is relevant to the first electric capacity 7 both end voltage, in the time that the first electric capacity 7 both end voltage decline greatly because of pwm control circuit 2 and soft 8 operating currents that switch off control circuit, error voltage value after output 47 outputs of the first comparator 39 are amplified raises, the reproduced pulse of the second comparator 38 broadens, in the time that the first electric capacity 7 both end voltage rise because load lightens, error voltage value after output 47 outputs of the first comparator 39 are amplified reduces, the output 51 of the second comparator 38 is exported pulse narrowing.The output 51 of the second comparator 38 is exported the input 53 that pulse exports the first inverter 37 to, the output 56 of the first inverter 37 is exported the input 57 that pulse exports the second inverter 36 to, the output 27 of the second inverter 36 is exported the control end 29 that pulse exports voltage cut-out 9 to, after the control 9 a bit of times of conducting of voltage cut-out, closes.The second inverter 36 drives function except having paraphase, also there is level shift function, in the time that the output 27 of the second inverter 36 is exported positive pulse, the endobiosis diode of the field effect transistor 34 of voltage cut-out 9 inside is by conducting, between resistance 35 two ends and field effect transistor 33 and the grid source electrode of field effect transistor 34, obtain positive drive voltage, be directly connected to the connection mid point of field effect transistor 33 and the field effect transistor 34 of voltage cut-out 9 inside the power supply of the second inverter 36, the power supply ground end of the second inverter 36 is compared the forward conduction voltage of the soft diode that switches off control circuit 8 power supply and be raised, ground level is shifted, make the second inverter 36 can control fast voltage cut-out 9 conductings and close.
Be more than wherein specific implementation of the present invention, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (6)
1. a soft power cutoff converter, comprise the transformer (12) being connected between input power and out-put supply, the armature winding of transformer (12) circuit controling switch (3) of connecting with input power negative terminal, described circuit controling switch (3) is by the output signal control break-make of a pwm control circuit (2), it is characterized in that: also comprise a soft voltage cut-out that switches off control circuit (8) and control (9), described voltage cut-out (9) one end connects the positive pole of rectifier diode (10), and the other end connects input power negative pole; Between the armature winding of described transformer (12) and input power negative terminal, be also connected a branch road of being connected successively by the second electric capacity (11), rectifier diode (10) and the first electric capacity (7); described the first electric capacity (7) and the second electric capacity (11) charge within circuit controling switch (3) the shutoff phase; for pwm control circuit (2) and soft switch off control circuit (8) provide operating voltage, make the soft shutoff of circuit controling switch (3) simultaneously and suppress the reverse voltage spike at circuit controling switch (3) two ends;
Described soft switch off control circuit (8) comprise the magnitude of voltage after the 3rd resistance (5) and the 4th resistance (6) dividing potential drop by the first electric capacity (7) two ends of connection successively and first comparator (39) of the error voltage value of reference voltage relatively and after output amplification, by the ramp voltage producing from a slope generating circuit (40) and described error voltage value relatively and export second comparator (38) of burst pulse, the input end signal of described slope generating circuit (40) is the output signal of pwm control circuit (2), described burst pulse exports the control end of described voltage cut-out (9) to after one first inverter (37) and one second inverter (36), and control fast voltage cut-out (9) conducting and close, soft switch off control circuit (8) are controlled at the ON time of voltage cut-out (9) in circuit controling switch (3) conduction period according to the voltage of first electric capacity (7) of the 3rd resistance (5) and the detection of the 4th resistance (6), and the second electric capacity (11) lotus of charging within circuit controling switch (3) the shutoff phase of voltage cut-out (9) series connection part of being released, restore circuit control switch (3) is at the soft turn-off function of next switch periods.
2. soft power cutoff converter according to claim 1, it is characterized in that: described input power anode connects the first electric capacity (7) and the tie point of rectifier diode (10) by the first resistance (1), for pwm control circuit (2) and soft switch off control circuit (8) provide the operating current of initial start.
3. soft power cutoff converter according to claim 1, it is characterized in that: described voltage cut-out (9) is made up of the first field effect transistor (33) and the second field effect transistor (34) and the 5th resistance (35), one end of the grid of the grid of described the first field effect transistor (33) and the second field effect transistor (34) and the 5th resistance (35) is connected in the output of the second inverter (36), the other end of the source electrode of the source electrode of the first field effect transistor (33) and the second field effect transistor (34) and the 5th resistance (35) is connected in the power supply ground end (28) of the second inverter (36), the drain electrode of described the first field effect transistor (33) connects the node of the second electric capacity (11) and rectifier diode (10), the drain electrode of the second field effect transistor (34) connects the power supply ground end of soft switch off control circuit (8).
4. soft power cutoff converter according to claim 1, it is characterized in that: the other end of circuit controling switch (3) is by the second resistance (4) ground connection, described pwm control circuit (2) is electrically connected with circuit controling switch (3) by current detecting input (19) and drive output (17), simultaneously by FB input input and output voltage error feedback signal.
5. soft power cutoff converter according to claim 1, is characterized in that: the pulse signal of the input (24) of slope generating circuit (40) input is and the synchronous pulse train of drive waveforms of circuit controling switch (3).
6. soft power cutoff converter according to claim 5, is characterized in that: described circuit controling switch (3) is transistor and field effect transistor and wherein any composition of igbt.
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| CN201410070471.XA CN103780065B (en) | 2014-02-28 | 2014-02-28 | A kind of soft switching supply convertor |
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| CN201410070471.XA CN103780065B (en) | 2014-02-28 | 2014-02-28 | A kind of soft switching supply convertor |
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| CN106300946A (en) * | 2016-09-20 | 2017-01-04 | 深圳市华星光电技术有限公司 | A kind of absorbing circuit, power supply circuits and liquid crystal display |
| CN107248812A (en) * | 2017-07-13 | 2017-10-13 | 天宝电子（惠州）有限公司 | A kind of soft switch back excitation type converter |
| CN108427028A (en) * | 2017-02-13 | 2018-08-21 | 三星电子株式会社 | A kind of semiconductor devices for monitoring backward voltage |
| CN109085411A (en) * | 2018-08-22 | 2018-12-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of thyristor both end voltage change rate detection circuit |
| CN110622386A (en) * | 2018-02-28 | 2019-12-27 | 深圳市大疆创新科技有限公司 | Battery control circuit, power control system and movable platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300946A (en) * | 2016-09-20 | 2017-01-04 | 深圳市华星光电技术有限公司 | A kind of absorbing circuit, power supply circuits and liquid crystal display |
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| CN108427028B (en) * | 2017-02-13 | 2022-06-07 | 三星电子株式会社 | Semiconductor device for monitoring reverse voltage |
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| CN110622386A (en) * | 2018-02-28 | 2019-12-27 | 深圳市大疆创新科技有限公司 | Battery control circuit, power control system and movable platform |
| CN110622386B (en) * | 2018-02-28 | 2023-09-12 | 深圳市大疆创新科技有限公司 | Battery control circuit, power supply control system and movable platform |
| CN109085411A (en) * | 2018-08-22 | 2018-12-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of thyristor both end voltage change rate detection circuit |
| CN109085411B (en) * | 2018-08-22 | 2021-06-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Circuit for detecting voltage change rate of two ends of thyristor |
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| CN103780065B (en) | 2016-07-13 |
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