CN107634646A - Switch power supply system - Google Patents
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- CN107634646A CN107634646A CN201710704083.6A CN201710704083A CN107634646A CN 107634646 A CN107634646 A CN 107634646A CN 201710704083 A CN201710704083 A CN 201710704083A CN 107634646 A CN107634646 A CN 107634646A
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Abstract
The invention discloses a kind of switch power supply system, it may include the first to the 4th power switch, first and second electric capacity and output filter, by controlling each power switch, so that the first electric capacity and the second electric capacity are connected in series between input voltage and ground potential in ON time, the first electric capacity and the second electric capacity are in parallel in when off, and the second end that output filter is connected to the first electric capacity provides output voltage.Switch power supply system of the present invention is suitable to the higher application scenario of switching frequency, can improve system duty cycle and efficiency in the case of given input and output voltage.
Description
Technical field
The present invention relates to field of electronic systems.More particularly it relates to switch power supply system.
Background technology
Switch power supply system is had been widely used in various electronic circuit systems.Presently most common Switching Power Supply
System is the non-isolation type buck converter based on Buck types topology.
In the application of Buck types topology, efficiency is to weigh the important parameter of its performance, however, it is higher in input voltage,
And under the relatively low application scenario of output voltage, single non-isolation type Buck types topology can produce larger switching loss, simultaneously
To the pressure-resistant proposition high requirement of power switch.Meanwhile now Buck types circuit often has a less dutycycle, and due to
Limited by system minimum service time, cause the switching frequency of system can not be too high, more had to the inhibitory action of ripple
Limit.
The content of the invention
For one or more problems of the prior art, the present invention proposes a kind of switch power supply system.
A kind of switch power supply system includes disclosed in one embodiment of the present of invention：Input port, for receiving an input
Voltage；First power switch, there is first end, the second end and control terminal, wherein the first end is electrically coupled to the input
Mouthful, the control terminal receives a high-side switch control signal；Second power switch, there is first end, the second end and control terminal,
Wherein described first end is electrically coupled to the second end of first power switch, and the control terminal receives low side switch control
Signal；First electric capacity, there is first end and the second end, wherein the first end is electrically coupled to the of first power switch
Two ends；3rd power switch, there is first end, the second end and control terminal, wherein the first end is electrically coupled to described second
Second end of power switch, second end are electrically coupled to the second end of first electric capacity, and the control terminal receives the height
Side switch controlling signal；4th power switch, there is first end, the second end and control terminal, wherein the first end electric coupling
To the second end of the 3rd power switch, second end is connected to the ground current potential, and the control terminal receives the low side switch
Control signal；Second electric capacity, there is first end and the second end, wherein the first end is electrically coupled to the 3rd power switch
First end, second end is connected to the ground current potential；Output filter, there is input, wherein output and ground, institute
The second end that input is connected to the 3rd power switch is stated, the earth terminal is connected to the ground current potential, and the output end provides
The output voltage of the switch power supply system.
In switch power supply system in one embodiment of the invention, the high-side switch control signal and the downside are opened
Pass control signal is periodic signal, and has the identical work period, in a work period：The high-side switch
Control signal controls first power switch and the 3rd power switch conducting in an ON time, when one turns off
In, control first power switch and the 3rd power switch shut-off；The low side switch control signal is described
In ON time, second power switch and the 4th power switch shut-off, within the turn-off time, control are controlled
Second power switch and the 4th power switch conducting.
Using the embodiment of the present invention, can reduce it is higher in input voltage, and under the relatively low application scenario of output voltage,
To the resistance to pressure request of power switch, and allow power switch that there is higher switching frequency at work.
Brief description of the drawings
Drawings below is related to about the non-limiting and description of the embodiment of nonexhaustive of the invention.Unless otherwise indicated,
Otherwise same numbers and symbols represents same or like part in whole accompanying drawing.Accompanying drawing need not be drawn to scale.Separately
Outside, relevant portion size shown in figure likely differs from the size described in specification.It is following to more fully understand the present invention
Detailed description and accompanying drawing will be provided to as reference.
Fig. 1 shows the circuit diagram of the switch power supply system 100 according to one embodiment of the present of invention.
Fig. 2 shows the physical circuit schematic diagram of the switch power supply system 100 according to one embodiment of the present of invention.
Fig. 3 shows the working waveform figure of switch power supply system 100.
Fig. 4 shows equivalent circuit diagram of the switch power supply system 100 in ON time.
Fig. 5 show switch power supply system 100 when off in equivalent circuit diagram.
Fig. 6 shows the physical circuit schematic diagram of the switch power supply system 200 according to an alternative embodiment of the invention.
Fig. 7 shows the physical circuit schematic diagram of the switch power supply system 300 of another embodiment according to the present invention.
Fig. 8 shows the working waveform figure of switch power supply system 300.
Fig. 9 shows the working waveform figure of switch power supply system 300.
Identical mark represents same or analogous feature in different accompanying drawings.
Embodiment
The specific embodiment of the present invention is described more fully below, it should be noted that the embodiments described herein is served only for illustrating
Illustrate, be not intended to limit the invention.In the following description, in order to provide thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that：This need not be carried out using these specific details
Invention.In other embodiments, in order to avoid obscuring the present invention, known circuit, system or method are not specifically described.
Fig. 1-2 shows the circuit diagram of the switch power supply system 100 according to one embodiment of the present of invention.Such as Fig. 1
Shown, switch power supply system 100 includes input port P1, and the first power switch M1, the second power switch M2, the 3rd power are opened
Close the electric capacity of M3, the 4th power switch M4, first C1, the second electric capacity C2, output filter F and output port P2.Wherein, it is defeated
Inbound port P1 is used to receive an input voltage VIN.First power switch M1 has first end, the second end and control terminal, wherein the
One end is electrically coupled to input port P1, and control terminal receives a high-side switch control signal HS.Second power switch M2 has the
One end, the second end and control terminal, wherein first end are in node SW1 the first power switch of electric coupling M1 the second end, control termination
Receive a low side switch control signal LS.First electric capacity C1 has first end and the second end, and wherein first end is in node SW1 thermocouples
Connect the first power switch M1 the second end.3rd power switch M3 has first end, the second end and control terminal, wherein first end
At the second end of node VMID the second power switch of electric coupling, the second end at the second end of node SW2 the first electric capacity of electric coupling,
Control terminal receives the high-side switch control signal HS.4th power switch M4 has first end, the second end and control terminal, its
Middle first end is electrically coupled to the 3rd power switch M3 the second end in node SW2, and the second end is connected to ground potential GND, control terminal
Receive low side switch control signal LS.Second electric capacity C2 has first end and the second end, and wherein first end is in node VMID electricity
The 3rd power switch M3 first end is coupled to, the second end is connected to ground potential GND.Output filter F has input, defeated
Go out end and earth terminal, wherein input are connected to the 3rd power switch M2 the second end in node SW2, earth terminal is connected to the ground
Current potential GND, output end provide the output voltage VO UT of switch power supply system.High-side switch control signal HS and low side switch control
The preferably a pair of square wave control signals with level complementary relationship of signal LS processed.
In one embodiment, output filter F is a LC filter circuits, including the outputs of an outputting inductance Lout and one
Electric capacity Cout.Wherein outputting inductance Lout between node SW2 and ground potential GND, exports with output capacitance Cout coupled in series
Inductance Lout and output capacitance Cout common port provide output voltage VO UT as the output end of system 100.This area is general
Logical technical staff is it is understood that in other embodiments, output filter F can be that other any ripples that can complete filter
The wave filter of effect.Selection output filter for those of ordinary skills belong to conventional technical means, herein
No longer it is described in detail.
In one embodiment, system 100 also includes DC-DC controllers 101, for producing high-side switch control signal
HS and low side switch control signal LS.DC-DC controllers 101 can use PWM (pulse width modulation), PFM (pulse frequencies
Modulation), the suitable control mode generation high-side switch HS control signals of COT (constant on-time) or other and low side switch
Control signal LS.For those of ordinary skills, DC-DC controller 101 of the selection with suitable control mode, it is raw
Belong to prior art and this area conventional technical means with low side switch control signal LS into high-side switch control signal HS, therefore
No longer it is described in detail herein.
Preferably, the first electric capacity C1 and the first electric capacity C2 capacitances are equal.
As shown in Fig. 2 in a preferred embodiment, the first power switch M1, the second power switch M2, the 3rd power switch
M3 and the 4th power switch M4 is metal oxide semiconductor field effect tube (MOSFET).Accordingly, opened for driving power
Close, system 100 also includes the first drive circuit 111, the second drive circuit 112, the 3rd drive circuit 113 and the 4th driving electricity
Road 114, it is respectively used to carry out high-side switch control signal HS and low side switch control signal LS level shift, driving first
Power switch M1, the second power switch M2, the 3rd power switch M3 and the 4th power switch M4.Wherein the first drive circuit
111 input receives high-side switch signal HS, and output end is coupled to the first power switch M1 control terminal.Second driving electricity
The input on road 112 receives low side switch signal LS, and output end is coupled to the second power switch M2 control terminal.3rd driving
The input of circuit 113 receives high-side switch signal HS, and output end is coupled to the 3rd power switch M3 control terminal.4 wheel driven
The input of dynamic circuit 114 receives low side switch signal LS, and output end is coupled to the 4th power switch M4 control terminal.Ability
Field technique personnel using drive circuit it is understood that carry out level shift, and driving work(to the control signal of power switch
Rate switchs, and belongs to common knowledge and conventional technical means in the art, therefore the specific feelings of drive circuit are no longer described in detail herein
Condition.
Fig. 3 shows the working waveform figure of switch power supply system 100.Fig. 4 and Fig. 5 is switch power supply system 100 at one
Equivalent circuit diagram in work period at different moments.Below in conjunction with Fig. 3-5, the operation principle of switch power supply system 100 is entered
Row illustrates.
For convenience of description, it is assumed that the first electric capacity C1 capacitance is identical with the second electric capacity C2 capacitance, and all elements are all reasons
Think, and circuit stability works.High-side switch control signal HS and low side switch control signal LS is pwm signal, and in height
Control switch conduction during level, control switch OFF during low level.It should be appreciated that above-mentioned hypothesis is done for explanatory purpose
Simplification, and without the intention of any restrictions scope of the invention.
One work period of switch power supply system 100 is since the K1 moment.
High-side switch control signal HS is located at high level, controls the first power switch M1 and the 3rd power M3 switch conductions,
Low side switch control signal LS is located at low level simultaneously, controls the second power switch M2 and the 4th power switch M4 shut-offs.This
When, system equivalent circuit diagram is as shown in figure 4, the first electric capacity connects to form a capacitive divider with the second electric capacity, at node SW1
Voltage be VSW1=VIN, node SW2 voltages are VSW2.
Assuming that before the K1 moment arrives, the voltage VC2 phases on voltage VC1 and the second electric capacity C2 on the first electric capacity C1
Deng being VC1=VC2=Vx.
Arrived moment at the K1 moment, if 2*Vx is not equal to VIN, then on C1 and C2 tandem paths, one will be produced
Individual transient current, give C1 and C2 charge or discharges so that VC1+VC2=VIN.
After this process terminates, at the K1 moment, it can obtain
First electric capacity C1 is equal with the second electric capacity C2 capacitance, now, the voltage VSW2=VC2 at node SW2：
Now, electric current flows through outputting inductance Lout, and output capacitance Cout is charged, and VOUT rises.If flow to outputting inductance
Lout electric current is IL, and according to node current law, then by the first power switch M1 and the first electric capacity C1, it is IL1 to have size
Electric current flow to outputting inductance Lout from VIN, by the second electric capacity C2 and the 3rd power switch M3, there is the electricity that size is IL2
Stream flows to wave filter from GND.
When after an ON time Ton, now having
VC1 (t=K1+Ton)+VC2 (t=K1+Ton)=VIN
IL1+IL2=IL
It can be obtained according to above equation
When after an ON time Ton, the K2 moment is reached.Now, high-side switch control signal HS is by high level saltus step
To low level, the first power switch M1 and the 3rd power switch M3 is turned off, LS is by low transition for low side switch control signal
To high level, turn on the second power switch M2 and the 4th power switch M4.Now, system equivalent circuit diagram is as shown in Figure 5.
First electric capacity C1 and the second electric capacity C2 is in parallel, and is grounded from node SW2.Node SW2 voltage VSW2 is pulled down to ground potential.
When the K2 moment arrives, i.e. during K1+Ton, because of discharge and recharge factor caused by IL, cause C1 and C2 both end voltages unequal.
At the K2 moment, shunt circuit is formed between C1 and C2, produce transient current, make C1 equal with C2 both end voltages.Now node SW1
With node VMID connections but between due to no electrical potential difference, so as to which no current flows through the second power switch M2.
After the balance of voltage on C1 and C2, the value that can obtain now VC1 and VC2 is：
When system is under periodic steady state, may infer that
VC1 (t=K2)=VC2 (t=K2)=Vx
By deriving, can obtain：
Work as C1=C2, have
Vx=Vin/2
On the other hand, the first electric capacity C1 and the second electric capacity C2 is not now the same as forming loop between output filter.Output
Inductance Lout discharges, and by the 4th power switch M4 afterflows, output voltage VO UT declines.
After by a turn-off time Toff, same VOUT is dropped at the K1 moment in K3 moment output voltage VOs UT
It is worth equal, low side switch control signal LS closing the second power switch M2 and the 4th power switch M4, high-side switch control signal
HS reopens the first power switch M1 and the 3rd power switch M3, and a work period terminates.
So, output voltage VO UT is the average voltage at node SW2：
Wherein, D is the dutycycle of switch power supply system 100.In general, the frequency of Switching Power Supply is in tens of KHz to hundreds of
Between KHz, for IL between several amperes to tens amperes, C1, C2 capacitance are uF ranks.Now, when applied to input voltage compared with
During the occasion of high (such as 100V),It can be ignored.
From above formula, in the case of input voltage is with output voltage identical, compared with prior art in Buck circuits
(VOUT=VIN × D), the dutycycle D of switch power supply system 100 can be higher, so can allow for switch power supply system 100
With higher switching frequency and shorter work period.Meanwhile for each work period, each power switch
Maximum electrical stress is reduced to VIN/2, significantly reduces the resistance to pressure request to power switch.Reduce resistance to pressure request and be advantageous to reality
Now smaller conducting resistance, so as to reduce conduction loss and raising efficiency.
Fig. 6 shows the circuit structure diagram of switch power supply system 200 according to another embodiment of the present invention.Such as Fig. 6 institutes
Show, compared to switch power supply system 100, switch power supply system 200 adds a current-limiting resistance 201, with the second power switch M2
Series connection, is coupled to the first electric capacity C1 first end and the second electric capacity C2 first end.Current-limiting resistance 201 can have to be any
The element of electrical resistance property, such as passive resistive element, transistor etc..
At the K2 moment, C1 is in parallel with C2, now according to deriving above, due to the voltage on C1 with the magnitude of voltage on C2 not
It is equal, therefore transient current occurs.Current-limiting resistance 201 can limit the electric current flowed through between C1 and C2, avoid excessive wink
State electric current causes device failure.
In another embodiment, current limliting can also be realized by the second power switch M2 and the 4th power switch M4, pass through
Suitable level shift (such as producing a signal step in control signal LS rising edge) is selected for control signal LS, is made
Second power switch M2 and the 4th power switch M4 has one larger first in the starting stage (i.e. K2 moment) of conducting
Conducting resistance, so as to suppress the transient current between C1 and C2.And after the balance of voltage between C1 and C2, the second power
Switch M2 has less second conducting resistance during Toff, so as to not produce extra loss, raising efficiency.
In one embodiment, M2, M4 manage for MOSFET.Control signal LS leading edge portion is as shown in Figure 7.In K2
When moment arrives, control signal LS jumps to one first level first, is jumped after a very first time Ts, then by the first level
Second electrical level is faded to, M2, M4 can turn in the case where LS is located at the first level and second electrical level, but M2, M4 are under second electrical level
Conducting resistance be less than conducting resistance under the first level.In the illustrated embodiment, the first level is less than second electrical level, M2,
M4 manages for N-type MOSFET.So when LS is located at the first level, although M2 and M4 conductings, because control signal LS is relatively low,
So that with a larger conducting resistance, transient current size is limited.After the very first time, the voltage at C1 and C2 both ends
Reach balance in the presence of transient current, now there is no electric current between C1 and C2 to flow through, but has freewheel current stream on M4
Cross, therefore LS jumps to second electrical level, M2 and M4 is respectively provided with relatively low conducting resistance, avoids reducing system effectiveness.
It is discussed below when the first electric capacity C1 is the same as the second electric capacity C2 capacitance anisochrouous situations.
When C1 is not equal to C2, Vx is not equal to Vin/2, then and at the K1 moment, VIN accesses can produce transient current, to
C1, C2 discharge and recharge.Now, extra discharge and recharge can influence efficiency, and an EMI interference can be also produced to power supply.
However, in actual circuit, it is difficult to make C1 and C2 capacitance definitely equal, now to avoid K1 moment, VIN institutes
Caused transient current is excessive to cause device failure, as shown in fig. 6, in one embodiment, can also be by a current-limiting resistance
Between the 202 same first power switch M1 of access VIN, to limit the transient current at K1 moment.
Similar, in another embodiment, current-limiting function can also be by the first power switch M1 and the 3rd power switch M3
To complete.By for control signal HS select suitable level shift (for example, as shown in fig. 7, control signal HS rising
Along producing a signal step), make M1 and M3 in the starting stage (i.e. K1 moment) of conducting, led with one larger first
Be powered resistance, so as to suppress VIN to caused transient current between the charging current between C1 and C2 and C1, C2.And in C1 and
After the balance of voltage between C2, M1 and M3 have less second conducting resistance during Ton, so as to not produce volume
Outer loss, raising efficiency.
Fig. 8 shows the electrical block diagram of the switch power supply system 300 according to further embodiment of this invention, compares
Switch power supply system 100, switch power supply system 300 adds four signal delay circuits, between each power switch
Shut-off order is opened in setting, and reserves necessary dead time, prevents that short circuit occurs in the handoff procedure of power switch.Its
In, the first delay circuit 301 has input and output end, and input receives high-side switch control signal HS, output end coupling
To the first power switch M1 control terminal, the first delay circuit is used to prolong high-side switch control signal HS rising edge
Late.Second delay circuit 302 has input and output end, and input receives low side switch control signal LS, output end coupling
The second power switch M2 control terminal is connected to, wherein the second delay circuit 302 is used for the rising to low side switch control signal LS
Edge is postponed.3rd delay circuit 303 has input and output end, and input receives high-side switch control signal HS,
Output end is couple to the 3rd power switch M3 control terminal, wherein the 3rd delay circuit 303 is used for high-side switch control signal
HS trailing edge is postponed.4th delay circuit 304 has input and output end, and input receives low side switch control
Signal LS, output end are couple to the 4th power switch M4 control terminal.4th delay circuit 304 is used to control low side switch
Signal LS trailing edge is postponed.
Switch power supply system 300 can also include dead band time setting circuit 305, be couple to the defeated of DC-DC controllers 101
Go out end, for postponing to high-side switch control signal HS and low side switch control signal LS rising edge, when reserving dead band
Between.In other embodiments, can also directly when generating high-side switch control signal HS and low side switch control signal LS,
The delay that dead time is carried out by DC-DC controllers 101 is set.
Structure relating to how to design delay circuit 301-304, and the structure of dead band time setting circuit 305, to obtain
The delay of rising edge or trailing edge is obtained, belongs to a part for prior art, is no longer described in detail herein.
Fig. 9 shows the working waveform figure of switch power supply system 300.As shown in figure 8, dead band time setting circuit 305 is first
First high-side switch control signal HS is postponed in rising edge, made between its trailing edge with low side switch control signal LS
Time difference with the first delay D1.Meanwhile dead band time setting circuit 305 is also rising to low side switch control circuit LS
Edge is postponed, and makes had for the second time difference for postponing D2 between its trailing edge with high-side switch control signal HS.Second work(
, it is necessary to prior to the 4th power switch M4 shut-offs, the first electricity is caused to avoid continued flow switch from being first turned off when off by rate switch M2
Hold the current potential lifting interference loop current on C1 and the second electric capacity C2 the second end.Therefore the 4th delay circuit 304 is by low side switch
The control signal LS delay D4 of trailing edge delay the 4th, but the 4th delay D4 is less than the first delay D1 to avoid dead time from losing
Effect, based on the reason for identical, the second power switch M2 when opening, it is necessary to be later than the 4th power switch M4 open-minded, therefore second
Low side switch control signal LS rise edge delay the 5th is postponed D5 by delay circuit 302.3rd power switch M3 is when opening
Opened earlier than the first power switch M1, to avoid the occurrence of excessive electric stress.Therefore the first delay circuit 301 is by high-side switch control
Signal HS processed rise edge delay the 3rd postpones D3.Based on the reason for identical, the first power switch M1 is when off earlier than the 3rd
Power switch M3 is turned off, therefore high-side switch control signal HS trailing edge delay the 6th is postponed D6 by the 3rd delay circuit 303,
But the 6th delay D6 is less than the second delay D2 to avoid dead time from failing.
It is to be understood that foregoing invention content and embodiment are intended to prove technical scheme provided by the present invention
Practical application, should not be construed as limiting the scope of the present invention.Those skilled in the art are spiritual and former the present invention's
In reason, when can various modifications may be made, equivalent substitution or improve.Protection scope of the present invention is defined by appended claims.
Claims (10)
1. a kind of switch power supply system, including：
Input port, for receiving an input voltage；
First power switch, there is first end, the second end and control terminal, wherein the first end is electrically coupled to the input
Mouthful, the control terminal receives a high-side switch control signal；
Second power switch, there is first end, the second end and control terminal, wherein the first end is electrically coupled to first power
Second end of switch, the control terminal receive a low side switch control signal；
First electric capacity, there is first end and the second end, wherein the first end is electrically coupled to the second of first power switch
End；
3rd power switch, there is first end, the second end and control terminal, wherein the first end is electrically coupled to second power
Second end of switch, second end are electrically coupled to the second end of first electric capacity, and the control terminal receives the high side and opened
Close control signal；
4th power switch, there is first end, the second end and control terminal, wherein the first end is electrically coupled to the 3rd power
Second end of switch, second end are connected to the ground current potential, and the control terminal receives the low side switch control signal；
Second electric capacity, there is first end and the second end, wherein the first end is electrically coupled to the first of the 3rd power switch
End, second end is connected to the ground current potential；
Output filter, there is input, output and ground, wherein the input is connected to the 3rd power switch
The second end, the earth terminal is connected to the ground current potential, and the output end provides the output voltage of the switch power supply system.
2. switch power supply system as claimed in claim 1, wherein the high-side switch control signal and the low side switch control
Signal processed is periodic signal, and has the identical work period, in a work period：
The high-side switch control signal controls first power switch and the 3rd power switch in an ON time
Conducting, within a turn-off time, control first power switch and the 3rd power switch shut-off；
The low side switch control signal controls second power switch and the 4th power to open in the ON time
Shut-off, within the turn-off time, control second power switch and the 4th power switch conducting.
3. switch power supply system as claimed in claim 1, further comprising a DC-to-dc (DC-DC) power-supply controller of electric, use
In the generation high-side switch control signal and the low side switch control signal.
4. switch power supply system as claimed in claim 1, wherein first power switch, the second power switch, the 3rd work(
Rate switchs and the 4th power switch is Metal-Oxide Semiconductor FET (MOSFET).
5. switch power supply system as claimed in claim 4, wherein the low side switch control signal has one in rising edge
Rank, for the low side switch control signal when rising edge arrives, saltus step is to one first level first, then by the very first time
Afterwards, by the first level saltus step a to second electrical level, wherein conducting of second power switch under the second electrical level
Resistance is less than the conducting resistance under first level.
6. switch power supply system as claimed in claim 4, wherein first electric capacity and the second capacitor's capacity are unequal, it is described
High-side switch control signal has a step in rising edge, and the high-side switch control signal is jumped first when rising edge arrives
One first level is faded to, then after the very first time, by the first level saltus step a to second electrical level, wherein described first
The conducting resistance of power switch and the 3rd power switch under the second electrical level is less than leading under first level
Be powered resistance.
7. switch power supply system as claimed in claim 1, wherein the capacitance of first electric capacity and the second electric capacity is identical.
8. switch power supply system as claimed in claim 1, wherein the switch power supply system also includes a current-limiting resistance, institute
State after current-limiting resistance connects with second power switch, be coupled to the first end of first electric capacity and second electric capacity
Between first end.
9. switch power supply system as claimed in claim 1, wherein the switch power supply system also includes a current-limiting resistance, institute
State the first electric capacity and the second capacitor's capacity is unequal, the current-limiting resistance is coupled to input port and first power switch
First end between.
10. switch power supply system as claimed in claim 1, the switch power supply system also includes：
First delay circuit, there is input and output end, the input receives the high-side switch control signal, described defeated
Go out the control terminal that end is couple to first power switch, wherein first delay circuit is to the high-side switch control signal
Rising edge postponed；
Second delay circuit, there is input and output end, the input receives the low side switch control signal, described defeated
Go out the control terminal that end is couple to second power switch, wherein second delay circuit is to the low side switch control signal
Rising edge postponed；
3rd delay circuit, there is input and output end, the input receives the high-side switch control signal, described defeated
Go out the control terminal that end is couple to the 3rd power switch, wherein the 3rd delay circuit is to the high-side switch control signal
Trailing edge postponed；
4th delay circuit, there is input and output end, the input receives the low side switch control signal, described defeated
Go out the control terminal that end is couple to the 4th power switch, wherein the 4th delay circuit is to the low side switch control signal
Trailing edge postponed.
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| CN201710704083.6A CN107634646A (en) | 2017-08-17 | 2017-08-17 | Switch power supply system |
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| CN201710704083.6A CN107634646A (en) | 2017-08-17 | 2017-08-17 | Switch power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247546A (en) * | 2019-06-04 | 2019-09-17 | 苏州汇川联合动力系统有限公司 | Non-isolation type biswitch reduction voltage circuit and DC-DC converter |
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2017
- 2017-08-17 CN CN201710704083.6A patent/CN107634646A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247546A (en) * | 2019-06-04 | 2019-09-17 | 苏州汇川联合动力系统有限公司 | Non-isolation type biswitch reduction voltage circuit and DC-DC converter |
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Application publication date: 20180126 |