CN108809070A - Power supply change-over device, slow start circuit and power supply control chip - Google Patents
Power supply change-over device, slow start circuit and power supply control chip Download PDFInfo
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- CN108809070A CN108809070A CN201710281300.5A CN201710281300A CN108809070A CN 108809070 A CN108809070 A CN 108809070A CN 201710281300 A CN201710281300 A CN 201710281300A CN 108809070 A CN108809070 A CN 108809070A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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Abstract
A kind of power supply change-over device, slow start circuit and power supply control chip, the power supply change-over device wherein include：There is one voltage conversion circuit one first side and a second side, the first side to receive a rectified voltage to generate an output voltage in the second side, and the first side is switched with one first side；There is one ON-OFF control circuit starting state and normal operating conditions, ON-OFF control circuit to provide the control control terminal that signal is switched to the first side；One start-up circuit provides current to control terminal when ON-OFF control circuit is in starting state, so that the first side switch is at least partly connected；An and slow start circuit, it is in starting state in ON-OFF control circuit, and the level of output voltage, when not reaching a predetermined level in one first predetermined time, slow start circuit reduces the electric current total amount for being supplied to control terminal within latter second predetermined time of the first predetermined time.
Description
Technical field
The present invention relates to a kind of power supply change-over device, specifically for a slow start circuit, for being avoided when starting state
A kind of power supply change-over device that output terminal shortcircuit throws into question.
Background technology
Fig. 1 shows the power supply change-over device 10 of the prior art, including a voltage conversion circuit 11 and control voltage conversion
One ON-OFF control circuit 12 of circuit 11 and a start-up circuit, start-up circuit include resistance R and startup control circuit 13.Voltage turns
It includes a transformer to change circuit 11, this transformer includes the first side and the second side, and the first side receives a rectified voltage Vin in the
Two sides generate an output voltage Vo, and voltage conversion circuit 11 includes one first side switch M (having a control terminal G) in the first side,
To control the current lead-through of the first side.With reference to Fig. 2, when power supply change-over device 10 starts, ON-OFF control circuit 12 is also starting
State and not yet enter normal operating conditions, therefore correctly control signal can't be generated and control the first side switch M.Cause
This, power supply change-over device 10 provides charge (starting current Is) by the resistance R in start-up circuit, to control terminal G, this charge is tired
It accumulates and the first side switch M is made to be in part conducting state.Start control circuit 13 and detect the first side electric current Ip, periodically to discharge
The charge that control terminal G is accumulated then generates the startup voltage waveform of the repetition between peak value level and valley level.Work as electricity
After voltage conversion circuit 11 starts, when the secondary side voltage Vo of voltage conversion circuit 11 reaches a threshold value, integrated circuit enters just
Normal working condition is just switched to and controls the first side switch M by ON-OFF control circuit 12.However, what secondary side voltage Vo was coupled
Load may be formed short circuit, cause secondary side voltage Vo that can not persistently reach threshold value because of factors such as damage or environment.It is secondary
Side voltage Vo can not persistently reach threshold value, and first side switch M of the startup control of control circuit 13 can be caused to be continuously in part and led
Logical state.When first side switch M is in part conducting state, conducting resistance is higher, if the first side switch M is continuously in this shape
State will produce high temperature, there is the danger of damage circuit.
Therefore, safeguard measure appropriate is provided in startup stage, is highly important.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art and defect, a kind of power supply change-over device, slow turn-on are proposed
Circuit and power supply control chip can provide safeguard measure appropriate in startup stage.
In order to achieve the above object, one of viewpoint is sayed, the present invention provides a kind of power supply change-over device, it includes：One
There is voltage conversion circuit one first side and a second side, first side to receive a rectified voltage to generate one in the second side
Output voltage, first side are switched with one first side, to control the current conductive state by the first side；One switch control electricity
There is a starting state and a normal operating conditions, the ON-OFF control circuit to provide a control signal to first side and switch on road
Control terminal, with controlled when normal operating conditions first side switch conducting state；One start-up circuit is controlled in the switch
When circuit is in starting state, the control terminal is provided current to, so that first side switch is at least partly connected；And one open slowly
Dynamic circuit adjusts the control signal when ON-OFF control circuit is in starting state, wherein when the ON-OFF control circuit is in
In the starting state, and the level of the output voltage is in one first predetermined time when not reaching a predetermined level, the slow turn-on
Circuit reduces the electric current total amount for being supplied to the control terminal within latter second predetermined time of first predetermined time.
In one embodiment, which did not reduced and carries within the latter third predetermined time of second predetermined time
Supply the electric current total amount of the control terminal.
In one embodiment, when the ON-OFF control circuit is in the starting state, which makes the control signal have
Have a startup voltage waveform of multiple repetitions between a peak value level and valley level, the slow start circuit above-mentioned this
In second predetermined time after one predetermined time, the mode for reducing the electric current total amount for being supplied to the control terminal includes following one
Or both more than：The slow start circuit is in second predetermined time, and respectively the startup voltage waveform reaches the peak value level for extension
Time；The slow start circuit reaches the frequency of the peak value level in second predetermined time, reducing those startup voltage waveforms
Rate；Or the slow start circuit extends the time for resting on valley level in second predetermined time.
In one embodiment, wherein the slow start circuit includes：An at least first-grade protection circuit is coupled to first side switch
Control terminal and ground between；And a control unit, the conducting state for controlling an at least first-grade protection circuit, when this is opened
It closes control circuit to be in the starting state, and the level of the output voltage in first predetermined time in not reaching the pre-determined bit
On time, which has the startup voltage waveform of multiple repetitions between a peak value level and a valley level, the control
Unit processed is in being connected an at least first-grade protection circuit in second predetermined time, to extend, respectively this is opened in second predetermined time
Dynamic voltage waveform reaches the time of the peak value level.In one embodiment, control signal has reach a peak value level first
Start voltage waveform, slow start circuit started for the first predetermined time from when starting voltage waveform to peaking level for first
Timing, wherein when the level of output voltage in the first predetermined time when not reaching predetermined level, slow start circuit starts from
The electric current total amount of control signal is reduced in two predetermined times.
In one embodiment, respectively the first-grade protection circuit includes a concatenated current switch and a current source, the current switch
It is coupled to the current source between the control terminal and ground of first side switch, wherein when the current switch is conducting state, the electricity
Stream source is connected between the control terminal switched in first side and ground, to reduce the electric current of the control signal in second predetermined time
Total amount.
In one embodiment, which includes multiple first-grade protection circuits, is somebody's turn to do when the ON-OFF control circuit is in
In starting state, and the level of the output voltage is in first predetermined time when not reaching the predetermined level, the control unit
In the cumulative quantity that those first-grade protection circuits are connected in second predetermined time, to reduce the control in second predetermined time
The electric current total amount of signal.
In one embodiment, wherein after those first-grade protection circuits are connected more than second predetermined time in the control unit,
The control unit is not turned on those first-grade protection circuits, with and rejudge the level of the output voltage in second predetermined time
The latter third predetermined time in whether reach the predetermined level.
In one embodiment, when the level of the output voltage reaches the predetermined level, a reset (Power on are generated
Reset) signal, the wherein ON-OFF control circuit switch to the normal work shape according to the reset signal, from the starting state
State.
In one embodiment, which stops adjusting the control signal according to the reset signal.
In one embodiment, when the ON-OFF control circuit is in the starting state, which makes the control signal have
There is the startup voltage waveform of multiple repetitions between a peak value level and valley level, and wherein the start-up circuit includes：One
Resistance is coupled between the rectified voltage and the control terminal of first side switch；One earthing switch is coupled to first side switch
Control terminal and ground between；And a pulse generator, intermittently to generate a pulse so that the earthing switch is connected.
In one embodiment, which is coupled between the pulse generator and the earthing switch, to extend this
The time span of pulse, wherein when the ON-OFF control circuit is in the starting state, and the slow start circuit receives the arteries and veins
When rushing, which extends the turn-on time of the earthing switch, and valley position is rested on to extend in second predetermined time
The accurate time.
In one embodiment, power supply change-over device, and include a power supply circuit, be coupled to the first side switch control terminal it
Between, to provide the power supply of start-up circuit and slow start circuit.
In order to achieve the above object, being sayed with regard to one of viewpoint, the present invention provides a kind of slow start circuits, for controlling an electricity
There is one first side and a second side, first side to receive a rectified voltage in this for voltage conversion circuit, the voltage conversion circuit
The second side generates an output voltage, which switchs with one first side, and wherein the voltage conversion circuit includes that a switch is controlled
Circuit processed and a start-up circuit, the ON-OFF control circuit have a starting state and a normal operating conditions, switch control electricity
Road provides the control terminal that a control signal is switched to first side when normal operating conditions, and the start-up circuit is in the switch control
Circuit processed provides current to the control terminal when being in the starting state, so that first side switch is at least partly connected, this is opened slowly
Dynamic circuit includes：An at least first-grade protection circuit is coupled between the control terminal and ground of first side switch；And one control it is single
Member, to control the conducting state of an at least first-grade protection circuit, wherein when the ON-OFF control circuit is in the starting state
In, and the level of the output voltage is in one first predetermined time when not reaching a predetermined level, the control unit in this first
An at least first-grade protection circuit is connected in latter second predetermined time of predetermined time, to reduce the electricity for being supplied to the control terminal
Flow total amount.
In one embodiment, which did not reduced and carries within the latter third predetermined time of second predetermined time
Supply the electric current total amount of the control terminal.
In one embodiment, when the level of the output voltage reaches the predetermined level, a reset signal is generated, this is opened slowly
Dynamic circuit stops reducing the electric current total amount for being supplied to the control terminal according to the reset signal.
In one embodiment, which includes multiple first-grade protection circuits, is somebody's turn to do when the ON-OFF control circuit is in
In starting state, and the level of the output voltage is in first predetermined time when not reaching the predetermined level, the control unit
In the cumulative quantity that those first-grade protection circuits are connected in second predetermined time, to reduce the control in second predetermined time
The electric current total amount of signal.
In one embodiment, after those first-grade protection circuits are connected more than second predetermined time in the control unit, the control
Unit processed is not turned on those first-grade protection circuits, with and rejudge the level of the output voltage after second predetermined time
The predetermined level whether is reached in one third predetermined time.
In order to achieve the above object, being sayed with regard to one of viewpoint, the present invention provides a kind of power supply control chips, for controlling one
Voltage conversion circuit, the voltage conversion circuit have one first side and a second side, first side receive a rectified voltage in
The second side generates an output voltage, which there is one first side to switch, and the control terminal which switchs is from the rectification
Voltage receives a starting current, which there is a starting state and a normal operating conditions, the power supply to control core
Piece includes：One ON-OFF control circuit, the ON-OFF control circuit provided when the normal operating conditions one control signal in this first
The control terminal of side switch；One starts control circuit, including：One earthing switch is coupled to the control terminal and ground of first side switch
Between；And a pulse generator, in the starting state, according to the ratio of electric current and a reference value by first side
Compared with as a result, generating a pulse, control terminal of the pulse first side switch is connected makes the control of first side switch to ground
Holding has the startup voltage waveform of multiple repetitions between a peak value level and a valley level；And a slow start circuit,
It is coupled between the pulse generator and the earthing switch, in the starting state, and the level of the output voltage is in one
When a predetermined level is not reached in the first predetermined time, in latter second predetermined time of first predetermined time according to the arteries and veins
It rushes and extends the time that the startup voltage waveform rests on the valley level.
Description of the drawings
Fig. 1 shows the schematic diagram of power supply change-over device according to prior art；
Fig. 2 shows the schematic diagram for controlling signal according to prior art；
Fig. 3 shows the schematic diagram of power supply change-over device according to an embodiment of the invention；
Fig. 4 controls are shown in when can not normally start and can normally start, the schematic diagram of control signal of the invention；
Fig. 5 shows the schematic diagram of control signal according to an embodiment of the invention；
Fig. 6 shows the schematic diagram of slow start circuit according to an embodiment of the invention；
Fig. 7 shows the schematic diagram of control signal according to an embodiment of the invention；
Fig. 8 shows the schematic diagram according to an embodiment of the invention for starting control circuit；
Fig. 9 shows the schematic diagram according to an embodiment of the invention for starting control circuit and slow start circuit；
Figure 10,11,12 show the schematic diagram of the control signal according to various embodiments of the present invention respectively；
Figure 13 shows the schematic diagram of power supply change-over device according to an embodiment of the invention；
Figure 14 shows the schematic diagram of power supply circuit according to an embodiment of the invention.
Symbol description in figure
10,20,30,40 power supply change-over device
11 voltage conversion circuits
12 ON-OFF control circuits
13 start-up circuits
131 earthing switches
132 pulse generators
14 slow start circuits
141 first-grade protection circuits
1411 current sources
1412 current switches
142 control units
15 power supply circuits
G control terminals
The first sides Ip electric current
Is starting currents
The first sides M switch
R, R1 resistance
T1, T2, T3, T4, t1, t2, t3 time
Vdd1, Vdd2 power supply
Vin rectified voltages
Vo output voltages
Vref reference values
Specific implementation mode
For the present invention aforementioned and other technology contents, feature and effect, it is following cooperation with reference to schema one preferably
In the detailed description of embodiment, can clearly it present.The direction term being previously mentioned in following embodiment, such as：Above and below, left,
It is right, front or rear etc., only it is the direction with reference to annexed drawings.Schema in the present invention belongs to signal, is mostly intended to indicate each device
And the function relationship of each interelement, it then and not according to ratio is drawn as shape, thickness and width.
With reference to Fig. 3, wherein showing power supply change-over device 20 according to an embodiment of the invention.Power supply change-over device 20 wraps
Contain：There is one voltage conversion circuit 11 one first side and a second side, the first side to receive a rectified voltage Vin in the second side
An output voltage Vo is generated, the first side has one first side switch M, to control the conducting of the first side electric current Ip by the first side
State；There is one ON-OFF control circuit 12 starting state and a normal operating conditions, ON-OFF control circuit 12 to provide a control
Signal to the first side switch M control terminal G, to control the conducting state of the first side switch M when normal operating conditions；One starts
Circuit (including resistance R and startup control circuit 13), when ON-OFF control circuit 12 is in starting state, provides current to control
G is held, so that the first side switch M is at least partly connected；And a slow start circuit 14, it is in ON-OFF control circuit 12 and starts shape
When state, adjustment control signal, wherein when ON-OFF control circuit 12 is in starting state, and the level of output voltage Vo is in one the
When not reaching a predetermined level in one predetermined time, slow start circuit 14 is within latter second predetermined time of the first predetermined time
(Fig. 4,5,7,10-12) reduces the electric current total amount for being supplied to control terminal.
Fig. 4 controls are shown in when can not normally start and can normally start, the schematic diagram of control signal of the invention.
Fig. 3,4 are please referred to, when ON-OFF control circuit 12 is in starting state, control signal controls signal produced by start-up circuit 13
Startup voltage waveform with multiple repetitions between a peak value level and valley level.When ON-OFF control circuit 12 is in just
When normal working condition, control signal is produced by ON-OFF control circuit 12.When ON-OFF control circuit 12 is in starting state (
Be exactly that power supply change-over device 20 is in starting state) reached for one first predetermined time and when still failing normally to start, slow turn-on
Circuit 14 reduces the electric current total amount for being supplied to control terminal within latter second predetermined time of the first predetermined time.Fig. 4 citings are aobvious
Show that the one way in which of " the electric current total amount that reduction is supplied to control terminal ", however, the present invention is not limited thereto will hereinafter illustrate
Bright other modes.On the other hand, when power supply change-over device 20 normally starts within the first predetermined time, then ON-OFF control circuit
12 enter normal operating conditions, and control signal is produced by ON-OFF control circuit 12.
Whether power supply change-over device 20 normally starts, and in one embodiment, can be judged according to the level of output voltage Vo.
When the level of output voltage Vo reaches predetermined level, represents power supply change-over device 20 and normally start, ON-OFF control circuit 12
Just normal operating conditions is switched to from starting state, starts to generate control signal to control terminal G.Switch to normal operating conditions
Afterwards, starting control circuit 13 and slow start circuit 14 can be closed (disabled)；For example, slow start circuit 14 can stop
Reduce the electric current total amount of control signal, startup control circuit 13 can stop the charge that release control end G is accumulated.
The level of output voltage Vo above-mentioned reaches predetermined level, can determine its judgment mode according to need.For example, usually
When startup finishes, a reset (Power on reset) signal is will produce inside or outside power supply change-over device 20, so that it may
Normal operating conditions is switched to according to this reset (Power on reset) signal.Or it can also pass through a voltage sensing
Circuit is to sense output voltage Vo, when the output voltage Vo of sensing reaches predetermined level, by ON-OFF control circuit 12 from startup
State switches to normal operating conditions, starts to generate control signal to control terminal G.Reset signal shown in Fig. 3 is only citing,
As described above, it is possible to use other modes judge whether output voltage Vo reaches predetermined level.
According to the present invention, after the first predetermined time reached, power supply change-over device 20 or ON-OFF control circuit 12 still fail
When normal startup, then the electric current total amount for being supplied to control terminal G is reduced.The electric current total amount for being supplied to control terminal G is reduced, indicates first
The integral turn-on time and conducting degree of side switch M declines, and can reduce the fever of the first side switch M.Refering to Fig. 5, reduces and provide
To the electric current total amount of control terminal G, one of mode is to extend the level for starting voltage waveform from valley level to peaking level
Time (after extension start voltage waveform slope it is relatively low, the time, T2 was longer than time T1).Since time T2 is longer than time T1, because
This frequency for starting voltage waveform declines.In other words, the embodiment of Fig. 5 is shown：Reduce the electric current total amount for being supplied to control terminal G
Mode, can extend and each start voltage waveform to the time of peaking level or reduce startup in the second predetermined time
Voltage waveform to peaking level frequency, or both.
In addition to the mode of Fig. 5 embodiments, in another embodiment, slow start circuit 14 can extend in the second predetermined time
Previous startup waveform and secondary one start waveform between, stay in the time of valley level, will be in hereinafter illustrating again.
Fig. 6 shows that one embodiment of the invention, wherein slow start circuit 14 include：An at least first-grade protection circuit 141, coupling
It is connected between the control terminal G and ground of the first side switch M；And a control unit 142, for controlling first-grade protection circuit 141
Conducting state.Control unit 142 can calculate for the first predetermined time in any way, such as, but not limited to can be according in itself
The timer in portion reaches a current reference according to the number of startup waveform to peaking level or according to the first side electric current Ip
Number of value, etc..After reaching for the first predetermined time, at least one first-grade protection circuit 141 is just connected in control unit 142.
When control terminal G is connected to ground in first-grade protection circuit 141, the starting current of control terminal G is provided to via resistance R
Is, some is conducted to ground by first-grade protection circuit 141.When the quantity of the first-grade protection circuit 141 of conducting increases,
Starting current Is by first-grade protection circuit 141 be conducted to ground ratio with increase.In the present embodiment, slow start circuit 14
It can be by controlling the quantity of the first-grade protection circuit 141 of conducting, and determine to extend each startup voltage waveform to peaking level
Time.With reference to Fig. 5, in 7 second predetermined time part, when the negligible amounts of the first-grade protection circuit 141 of conducting are (or by wherein
The electric current of current source 1411 is relatively low) when, each time for starting voltage waveform to peaking level is shorter, that is, starts voltage waveform
Slope is higher.When the quantity of the first-grade protection circuit 141 of conducting more (or higher by the electric current of wherein current source 1411),
Each time for starting voltage waveform to peaking level is longer, that is, the slope for starting voltage waveform is relatively low.In this way, by controlling electricity
Leadage circuit 141 is flowed, the electric current total amount for being supplied to control terminal G can be reduced in the second predetermined time.
First-grade protection circuit 141 can design its circuit according to operating characteristics above-mentioned, and Fig. 6 only shows wherein one implementation
Example.According to Fig. 6, each first-grade protection circuit 141 includes 1412 and one current source 1411 of a concatenated current switch, current switch
1412 and current source 1411 be coupled between the control terminal G and ground of the first side switch M.When current switch 1412 be conducting state,
Current source 1411 is connected between the control terminal G and ground of the first side switch M, and control terminal is supplied to reduce in the second predetermined time
The electric current total amount of G.According to the present invention, slow start circuit 14 can only include single current leadage circuit 141, also contain multiple electric currents
Leadage circuit 141, and first-grade protection circuit 141 or other forms (such as including variable current source etc.), are not only restricted to Fig. 6
Embodiment.
With reference to Fig. 7, in an embodiment, slow start circuit 14 includes multiple first-grade protection circuits 141, works as ON-OFF control circuit
12 in the starting state, and output voltage Vo is in the first predetermined time when not reaching predetermined level, and control unit 142 is in the
In two predetermined times, the multiple first-grade protection circuits 141 of cumulative conducting, with gradually increase in the second predetermined time reduction electric current
Total amount (Fig. 7, time T1<T2<T3<T4).In addition, can also determine conducting electric current leadage circuit 141 according to other factor of judgment
Quantity increase the quantity of conducting electric current leadage circuit 141 such as when the operation temperature of the first side switch M is higher, in another example
When the operation temperature of the first side switch M is relatively low, the quantity of conducting electric current leadage circuit 141 is reduced.
When multiple first-grade protection circuits 141 are connected more than the second predetermined time in control unit 142, and the position of output voltage Vo
Standard when not reaching predetermined level yet in the second predetermined time, control unit 142 can the second predetermined time latter third it is predetermined
In time, closes all or part of first-grade protection circuit 141 or gradually close first-grade protection circuit 141, it is defeated to rejudge
Go out the level of voltage Vo in whether reaching predetermined level in the third predetermined time.Fig. 7 is shown as closing within the third predetermined time
All or first-grade protection circuit 141, therefore T1 is reverted to from valley level to the time of peaking level, but also can progressively certainly
T4 reverts to T3, again to T2, again to T1 or other arrangements.Such as the first predetermined time, control unit 142, which can be used, appoints
Where formula calculated for the second predetermined time.
When output voltage Vo is in reaching predetermined level in the third predetermined time, slow start circuit 14 just stops control, and this is controlled
The electric current total amount for holding G, changes and controls this control terminal G by ON-OFF control circuit.When the level of output voltage Vo is in the third predetermined time
Do not reach predetermined level inside, then start-up circuit and slow start circuit 14 can continue the electric current total amount that control is supplied to control terminal.This
Outside, after the third predetermined time, if output voltage Vo does not reach predetermined level yet, the peace of similar second predetermined time can be returned
Row's mode.
With reference to Fig. 8, in an embodiment, starting control circuit 13 includes：One earthing switch 131 is coupled to the first side switch M
Control terminal G and ground between；And a pulse generator 132, for intermittently generating a pulse so that earthing switch is connected
131.In one embodiment, pulse generator 132 intermittently generates the mode of pulse, may be, for example,：It is electric according to the first side is passed through
Flow an Ip and reference value Vref comparison result (in an embodiment, voltage difference and reference value that resistance R1 is passed through according to electric current Ip
Vref is compared), decide whether that earthing switch 131 is connected；In this way, control signal has between a peak value level and ground
The startup voltage waveform of multiple repetitions.
Fig. 9 shows that power supply change-over device 30 according to another embodiment of the present invention, wherein slow start circuit 14 are coupled to arteries and veins
It rushes between generator 312 and earthing switch 131, to extend the time span of pulse.Start when ON-OFF control circuit 12 is in
When state, when start-up circuit 14 of waiting a moment receives pulse, slow start circuit 14 extends the turn-on time of earthing switch, to extend the
The previous voltage waveform that starts is to the valley level time between next startup voltage waveform in two predetermined times；In the second predetermined time
Interior, the valley level time increased can be fixation, or be incremented by (Figure 10,0<t1<t2).Slow start circuit 14 subtracts in Fig. 9,10
It is supplied to the mode of the electric current total amount of control terminal G less, to be directly coupled to ground by control terminal G.Slow start circuit 14 in Fig. 9,10,
Though different between the setting control terminal switched in the first side of current source 1411 and ground, right two implement in Fig. 6 slow start circuits 14
Example all has the effect of reducing the electric current total amount for being supplied to control terminal G.Further, two embodiments are more combinable, to reinforce reducing
It is supplied to the effect of the electric current total amount of control terminal G, the control signal generated please refers to Figure 11, wherein control signal has both and opens
The slope of dynamic waveform reduces and extends the effect of valley level time.For example, slow start circuit 14 can be produced according to pulse
Raw device 312 exports the rising edge of pulse and generates rising edge, but the falling edge of pulse is exported for delay pulse generator 312, i.e.,
The time span of pulse can be extended.
Figure 12 shows one embodiment of the invention, when the slow start circuit 14 of Fig. 9 carries out extending the ground connection between starting waveform
Between, after the second predetermined time, slow start circuit 14 can restore pulse original time length (can recover immediately such as Figure 12,
Or gradually restore to restore to t1, again to close to 0) from t2, to sentence again in the latter third predetermined time of the second predetermined time
Whether disconnected output voltage Vo reaches predetermined level.
Similar to previous embodiment, the valley level time is necessarily cumulative or decrescence changes, for example, can also arrange be：When
When the operation temperature of side switch M is higher, increase the valley level time, and when the operation temperature of the first side switch M is relatively low, drop
The low ebb value level time.
Figure 13 shows the power supply change-over device 40 of another embodiment of the present invention, wherein comprising ON-OFF control circuit 12, starting
Control circuit 13, slow start circuit 14 and a power supply circuit 15.The present embodiment, which is also accompanied by display resistance R, equally to be changed
It is connected to the position of icon.Power supply circuit 15 is coupled to the control terminal G of the first side switch M, with provide start control circuit 13 with
Power supply needed for slow start circuit 14 (Vdd1, Vdd2, wherein Vdd1 and Vdd2 can be identical or different).Because starting control electricity
Road 13 is to work when output voltage Vo not yet reaches predetermined level, therefore its power supply is needed from output electricity with slow start circuit 14
It presses other than Vo.Figure 14 shows the power supply circuit 15 of a wherein embodiment, including a capacitance, to provide power supply Vdd1, Vdd2 to slow
Start-up circuit 14 and startup control circuit 13.If it is different from the power supply needed for slow start circuit 14 to start control circuit 13, can
Different voltage is generated with bleeder circuit again.
In one embodiment, ON-OFF control circuit 12, startup control circuit 13 and slow start circuit 14, can be produced on list
In one integrated circuit, or it is incorporated into the same power supply control chip.
Illustrate the present invention for preferred embodiment above, it is described above, only those skilled in the art is made to be easy to
Solve present disclosure, interest field not for the purpose of limiting the invention.Under the same spirit of the present invention, people in the art
Member can think and various equivalence changes.Two circuits or interelement that icon is directly connected in each embodiment, can plant not influences to lead
Want other circuits or element of function, it is only necessary to the meaning of corresponding modification interlock circuit or signal.All this kind, all can root
Analogize according to teachings of the present invention and obtain, therefore, the scope of the present invention should cover above-mentioned and other all equivalence changes.It is above-mentioned each
A embodiment, however it is not limited to be used alone, such as, but not limited to two embodiments can be also used in combination, or with it with combination application
The local circuit of middle one embodiment replaces the corresponding circuits of another embodiment.
Claims (18)
1. a kind of power supply change-over device, which is characterized in that include：
There is one voltage conversion circuit one first side and a second side, first side to receive a rectified voltage in the second side
An output voltage is generated, which switchs with one first side, to control the current conductive state by the first side；
There is one ON-OFF control circuit a starting state and a normal operating conditions, the ON-OFF control circuit to provide a control news
Number to first side switch control terminal, with controlled when normal operating conditions first side switch conducting state；
One start-up circuit provides current to the control terminal when ON-OFF control circuit is in starting state, so that first side
Switch is at least partly connected；And
One slow start circuit adjusts the control signal when ON-OFF control circuit is in starting state, wherein when the switch control
Circuit processed is in the starting state, and the level of the output voltage in one first predetermined time in not reaching a predetermined level
When, which reduces the electric current for being supplied to the control terminal within latter second predetermined time of first predetermined time
Total amount.
2. power supply change-over device as described in claim 1, wherein the slow start circuit in second predetermined time latter
In three predetermined times, the electric current total amount for being supplied to the control terminal is not reduced.
3. power supply change-over device as described in claim 1, wherein, should when the ON-OFF control circuit is in the starting state
Start-up circuit makes the control signal with the startup voltage waveform of multiple repetitions between a peak value level and valley level, preceding
The slow start circuit stated reduces the electric current for being supplied to the control terminal in second predetermined time after first predetermined time
The mode of total amount includes following one or both or more：The slow start circuit extends the respectively startup in second predetermined time
Voltage waveform reaches the time of the peak value level；The slow start circuit in second predetermined time, reduce those start voltage
Waveform reaches the frequency of the peak value level；Or the slow start circuit, in second predetermined time, extension rests on valley level
Time.
4. power supply change-over device as described in claim 1, wherein the slow start circuit includes：
An at least first-grade protection circuit is coupled between the control terminal and ground of first side switch；And
One control unit, the conducting state for controlling an at least first-grade protection circuit are somebody's turn to do when the ON-OFF control circuit is in
In starting state, and the level of the output voltage is in first predetermined time when not reaching the predetermined level, the control signal
Startup voltage waveform with multiple repetitions between a peak value level and a valley level, the control unit are second pre- in this
It fixes time the interior conducting at least first-grade protection circuit, it should to extend in second predetermined time that the respectively startup voltage waveform reaches
The time of peak value level.
5. power supply change-over device as claimed in claim 4, wherein respectively the first-grade protection circuit includes a concatenated current switch
With a current source, the current switch and the current source are coupled between the control terminal and ground of first side switch, wherein when the electricity
Stream switch be conducting state, between the control terminal which switch in first side and ground, with reduce this second make a reservation for
The electric current total amount of the control signal in time.
6. power supply change-over device as claimed in claim 4, wherein the slow start circuit includes multiple first-grade protection circuits,
When the ON-OFF control circuit is in the starting state, and the level of the output voltage in first predetermined time in not reaching this
When predetermined level, the control unit is in the cumulative quantity that those first-grade protection circuits are connected in second predetermined time, to reduce
The electric current total amount of the control signal in second predetermined time.
7. power supply change-over device as claimed in claim 6, wherein be more than when those first-grade protection circuits are connected in the control unit
After second predetermined time, which is not turned on those first-grade protection circuits, with and rejudge the position of the output voltage
Whether standard in the latter third predetermined time of second predetermined time in reaching the predetermined level.
8. power supply change-over device as described in claim 1, wherein when the level of the output voltage reaches the predetermined level,
A reset signal is generated, it is normal to switch to this according to the reset signal from the starting state for the wherein ON-OFF control circuit
Working condition.
9. power supply change-over device as claimed in claim 8, wherein the slow start circuit stops adjusting according to the reset signal
The whole control signal.
10. power supply change-over device as described in claim 1, wherein, should when the ON-OFF control circuit is in the starting state
Start-up circuit makes the control signal with the startup voltage waveform of multiple repetitions between a peak value level and valley level, and
Wherein the start-up circuit includes：
One resistance is coupled between the rectified voltage and the control terminal of first side switch；
One earthing switch is coupled between the control terminal and ground of first side switch；And
One pulse generator, intermittently to generate a pulse so that the earthing switch is connected.
11. power supply change-over device as claimed in claim 10, wherein the slow start circuit is coupled to the pulse generator and is somebody's turn to do
Between earthing switch, to extend the time span of the pulse, wherein when the ON-OFF control circuit is in the starting state, and
When the slow start circuit receives the pulse, which extends the turn-on time of the earthing switch, with extend this second
The time of valley level is rested in predetermined time.
12. power supply change-over device as described in claim 1, wherein and include a power supply circuit, it is coupled to first side switch
Control terminal, to provide the power supply of the start-up circuit and the slow start circuit.
13. a slow start circuit, for controlling a voltage conversion circuit, which has one first side and one second
Side, first side receive a rectified voltage to generate an output voltage in the second side, which switchs with one first side,
Wherein the voltage conversion circuit includes an ON-OFF control circuit and a start-up circuit, which has a starting state
With a normal operating conditions, which provides a control signal to first side when normal operating conditions and switchs
Control terminal, which provides current to the control terminal when ON-OFF control circuit is in the starting state, so that should
First side switch is at least partly connected, which is characterized in that the slow start circuit includes：
An at least first-grade protection circuit is coupled between the control terminal and ground of first side switch；And
One control unit, to control the conducting state of an at least first-grade protection circuit, wherein at the ON-OFF control circuit
In the starting state, and the level of the output voltage is in one first predetermined time when not reaching a predetermined level, the control
Unit is supplied in an at least first-grade protection circuit is connected in latter second predetermined time of first predetermined time with reducing
The electric current total amount of the control terminal.
14. slow start circuit as claimed in claim 13, wherein the slow start circuit in second predetermined time latter
In three predetermined times, the electric current total amount for being supplied to the control terminal is not reduced.
15. slow start circuit as claimed in claim 13, wherein when the level of the output voltage reaches the predetermined level,
A reset signal is generated, which stops reducing being supplied to the electric current of the control terminal total according to the reset signal
Amount.
16. slow start circuit as claimed in claim 13, wherein the slow start circuit includes multiple first-grade protection circuits,
When the ON-OFF control circuit is in the starting state, and the level of the output voltage in first predetermined time in not reaching this
When predetermined level, the control unit is in the cumulative quantity that those first-grade protection circuits are connected in second predetermined time, to reduce
The electric current total amount of the control signal in second predetermined time.
17. slow start circuit as claimed in claim 13, wherein be more than when those first-grade protection circuits are connected in the control unit
After second predetermined time, which is not turned on those first-grade protection circuits, with and rejudge the position of the output voltage
Whether standard in the latter third predetermined time of second predetermined time in reaching the predetermined level.
18. a power supply control chip, for controlling a voltage conversion circuit, which has one first side and one the
Two sides, first side receive a rectified voltage to generate an output voltage in the second side, which there is one first side to open
It closes, the control terminal of first side switch receives a starting current from the rectified voltage, which has one to start shape
State and a normal operating conditions, which is characterized in that the power supply control chip includes：
One ON-OFF control circuit, the ON-OFF control circuit provide a control signal when normal operating conditions and are opened in first side
The control terminal of pass；
One starts control circuit, including：
One earthing switch is coupled between the control terminal and ground of first side switch；And
One pulse generator, in the starting state, according to the comparison knot of electric current and a reference value by first side
Fruit, generates a pulse, and control terminal of the pulse first side switch is connected makes the control terminal tool of first side switch to ground
There is the startup voltage waveform of multiple repetitions between a peak value level and a valley level；And
One slow start circuit is coupled between the pulse generator and the earthing switch, and in the starting state, and this is defeated
Go out the level of voltage when not reaching a predetermined level in one first predetermined time, latter second in first predetermined time is pre-
It fixes time the interior time for extending the startup voltage waveform according to the pulse and resting on the valley level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710281300.5A CN108809070B (en) | 2017-04-26 | 2017-04-26 | Power conversion device, slow start circuit and power control chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710281300.5A CN108809070B (en) | 2017-04-26 | 2017-04-26 | Power conversion device, slow start circuit and power control chip |
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| Publication Number | Publication Date |
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| CN108809070A true CN108809070A (en) | 2018-11-13 |
| CN108809070B CN108809070B (en) | 2020-05-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648693A (en) * | 2020-12-18 | 2021-04-13 | 青岛海信日立空调系统有限公司 | Air conditioner and multi-channel PFC circuit control method |
| CN112713746A (en) * | 2019-10-24 | 2021-04-27 | 立锜科技股份有限公司 | Power conversion device, control circuit and control method thereof |
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|---|---|---|---|---|
| US20140233283A1 (en) * | 2013-02-20 | 2014-08-21 | Taiwan Semiconductor Manufacturing Company, Ltd. | Startup circuit and method for ac-dc converters |
| US20150256060A1 (en) * | 2014-03-05 | 2015-09-10 | Tower Semiconductor Ltd. | Soft-Start Circuit For Switching Regulator |
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2017
- 2017-04-26 CN CN201710281300.5A patent/CN108809070B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140233283A1 (en) * | 2013-02-20 | 2014-08-21 | Taiwan Semiconductor Manufacturing Company, Ltd. | Startup circuit and method for ac-dc converters |
| US20150256060A1 (en) * | 2014-03-05 | 2015-09-10 | Tower Semiconductor Ltd. | Soft-Start Circuit For Switching Regulator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713746A (en) * | 2019-10-24 | 2021-04-27 | 立锜科技股份有限公司 | Power conversion device, control circuit and control method thereof |
| CN112648693A (en) * | 2020-12-18 | 2021-04-13 | 青岛海信日立空调系统有限公司 | Air conditioner and multi-channel PFC circuit control method |
| CN112648693B (en) * | 2020-12-18 | 2023-08-04 | 青岛海信日立空调系统有限公司 | Air conditioner and multi-channel PFC circuit control method |
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| CN108809070B (en) | 2020-05-01 |
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