CN109067171A - Multiple-output electric power - Google Patents
Multiple-output electric power Download PDFInfo
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- CN109067171A CN109067171A CN201810985388.3A CN201810985388A CN109067171A CN 109067171 A CN109067171 A CN 109067171A CN 201810985388 A CN201810985388 A CN 201810985388A CN 109067171 A CN109067171 A CN 109067171A
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- 239000004065 semiconductor Substances 0.000 claims description 93
- 239000003990 capacitor Substances 0.000 claims description 73
- 238000004804 winding Methods 0.000 claims description 48
- 239000003381 stabilizer Substances 0.000 claims description 35
- 230000005611 electricity Effects 0.000 claims description 14
- 230000015556 catabolic process Effects 0.000 claims description 10
- -1 resistance Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000000717 retained effect Effects 0.000 description 1
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Classifications
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/073—Charge pumps of the Schenkel-type
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/073—Charge pumps of the Schenkel-type
- H02M3/075—Charge pumps of the Schenkel-type including a plurality of stages and two sets of clock signals, one set for the odd and one set for the even numbered stages
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- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of multiple-output electric power, including at least sequential control circuit all the way.Multichannel sequential export may be implemented, the time that every road output voltage is established is set as needed.Output is opened in bypass delay for control switch power supply product, is started application demand to solve the timing of client's multiple equipment, while reducing cost, is occupied little space, when this circuit be can be used in the Switching Power Supply of doubleway output or more, effect is the most obvious.
Description
Technical field
The present invention relates to field of switch power, specifically, being related to the Switching Power Supply of multiple-channel output.
Background technique
In Switching Power Supply of today production, many Switching Power Supply products realize multiple-channel output, to meet the more equipment of client
Use, while cost is substantially reduced, without the one-to-one application of the corresponding equipment of a Switching Power Supply product, so multichannel
The application that the Switching Power Supply product of output has become client is preferred；Currently, many equipment require a kind of timing starting or close
Disconnected situation, such as an equipment first start, other equipment delay a period of time after start, with guarantee equipment normal operation or
Person stores data etc.；At present the scheme of the solution of industry be using timing power supply insert row or multiple switch power supply product and
Software compatibility realizes that such as Fig. 1, but this results in cost excessively high, occupied space is larger, this is not desired by manufacturer and client,
Nor optimal scheme；And using single switch power supply includes the Optimum cost of multiple-channel output, and main road bypass is all to meet
Safety isolation, but the output voltage of the main road bypass of Switching Power Supply product is almost while establishing, and is unsatisfactory for client's
Used in cycle time.
Summary of the invention
In view of this, the present invention provides a kind of multiple-output electric power in view of the above problems, produced for control switch power supply
The master of product and/or bypass delay opens output, with solve client's multiple equipment timing start application demand, while reduction at
This, occupies little space, when this circuit be can be used in the Switching Power Supply of doubleway output or more, effect is become apparent.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of multiple-output electric power, the vice-side winding including at least two transformers, a vice-side winding form main output
Circuit, other vice-side windings form auxiliary output circuit, add sequential control circuit in auxiliary output circuit, sequential control circuit includes
Metal-oxide-semiconductor, resistance and capacitor, metal-oxide-semiconductor seal between vice-side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected vice-side winding
One end and capacitor one end, the source electrode of metal-oxide-semiconductor connect with output negative pole, the grid of metal-oxide-semiconductor be separately connected resistance one end and
The other end of the other end of capacitor, resistance is connect with output cathode.
Preferably, the main output circuit also adds sequential control circuit, sequential control circuit include metal-oxide-semiconductor, resistance and
Capacitor, metal-oxide-semiconductor seal between vice-side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected the one of vice-side winding and capacitor
End, the source electrode of MOS pipe are connect with output negative pole, and the grid of metal-oxide-semiconductor is separately connected one end of resistance and the other end of capacitor, electricity
The other end of resistance is connect with output cathode.
Preferably, the sequential control circuit, further includes voltage-stabiliser tube, and voltage-stabiliser tube seals in the grid and resistance, capacitor of metal-oxide-semiconductor
Connecting pin between, i.e., the grid of the anode of voltage-stabiliser tube and metal-oxide-semiconductor connect, the cathode of voltage-stabiliser tube be separately connected resistance one end and
The other end of capacitor.
The present invention also provides multiple-output electric power, the vice-side winding including at least two transformers, a vice-side winding shape
At main output circuit, other vice-side windings form auxiliary output circuit, add sequential control circuit, timing control in auxiliary output circuit
Circuit includes metal-oxide-semiconductor, resistance and capacitor, and metal-oxide-semiconductor seals between vice-side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected
One pole of vice-side winding and capacitor, the source electrode of metal-oxide-semiconductor are connect with output negative pole, and the grid of metal-oxide-semiconductor is separately connected one end of resistance
And the other end of capacitor, the other end of resistance are connect with output cathode；The output voltage settling time of sequential control circuit follows
Following relational expression:Wherein, VQ is the conducting voltage of metal-oxide-semiconductor, and Vo+ is the output voltage of power supply, t
For the settling time of output voltage, R is the resistance value of resistance, and C is the capacitance of capacitor.
Preferably, the main output circuit also adds sequential control circuit, sequential control circuit include metal-oxide-semiconductor, resistance and
Capacitor, metal-oxide-semiconductor seal between vice-side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected the one of vice-side winding and capacitor
End, the source electrode of MOS pipe are connect with output negative pole, and the grid of metal-oxide-semiconductor is separately connected one end of resistance and the other end of capacitor, electricity
The other end of resistance is connect with output cathode.
The present invention provides a kind of multiple-output electric power again, the vice-side winding including at least two transformers, a secondary side around
Group forms main output circuit, other vice-side windings form auxiliary output circuit, adds sequential control circuit, timing in auxiliary output circuit
Control circuit includes metal-oxide-semiconductor, resistance, capacitor and voltage-stabiliser tube, and metal-oxide-semiconductor seals between vice-side winding and output stage, i.e. the leakage of metal-oxide-semiconductor
Pole is separately connected a pole of vice-side winding and capacitor, and the source electrode of metal-oxide-semiconductor is connect with output negative pole, the grid and voltage-stabiliser tube of metal-oxide-semiconductor
Anode connection, the cathode of voltage-stabiliser tube is separately connected one end of resistance and the other end of capacitor, and the other end of resistance and output are just
Pole connection；Wherein, the breakdown voltage of voltage-stabiliser tube is greater than the conducting voltage of metal-oxide-semiconductor, when the output voltage of sequential control circuit is established
Between follow following relational expression:Wherein, VZFor the breakdown voltage of voltage-stabiliser tube, Vo+ is the defeated of power supply
Voltage out, t are the settling time of output voltage, and R is the resistance value of resistance, and C is the capacitance of capacitor.
Preferably, the main output circuit also adds sequential control circuit, and sequential control circuit includes metal-oxide-semiconductor, resistance, electricity
Hold and voltage-stabiliser tube, metal-oxide-semiconductor seal between vice-side winding and output stage, is i.e. the drain electrode of metal-oxide-semiconductor is separately connected vice-side winding and capacitor
A pole, the source electrode of metal-oxide-semiconductor connect with output negative pole, and the grid of metal-oxide-semiconductor and the anode of voltage-stabiliser tube connect, the cathode point of voltage-stabiliser tube
Not Lian Jie one end of resistance and the other end of capacitor, the other end of resistance connect with output cathode.
Compared with prior art, multiple-output electric power of the invention has the following beneficial effects:
1) this programme circuit is simple, easily designed, at low cost convenient for debugging；
2) it the delay service time of the controllable product of the present invention respectively exported, is formed and establishes output according to timing；
3) present invention is changed to the single multiple-output electric power control of product by multiple control of product, and cost can be greatly reduced, and saves
Save use space；
4) present invention does not influence the safety isolation between former secondary side, each output, will not reduce the reliability of product.
Detailed description of the invention
Fig. 1 is the functional block diagram of existing multiple-channel output timing start-up circuit；
Fig. 2 is functional block diagram of the sequential control circuit of multiple-output electric power of the present invention in application system；
Fig. 3 is the schematic diagram of multiple-output electric power first embodiment of the present invention；
Fig. 4 is the schematic diagram of multiple-output electric power second embodiment of the present invention；
Fig. 4-1 is the test waveform figure of the 24V output voltage settling time of second embodiment of the invention；
Fig. 4-2 is the test waveform figure of the 12V output voltage settling time of second embodiment of the invention.
Specific embodiment
As shown in Fig. 2, for functional block diagram of the sequential control circuit in application system of multiple-output electric power of the present invention, one
Kind multiple-output electric power can according to need and the time that every road output voltage is established is arranged, and to realize, multichannel is set in application system
Standby timesharing sequence, which is powered, to be needed.It can also only export all the way and carry out timing setting, can specifically be determined according to application system demand
Determine the number of power supply output.
For convenience of description, each road output circuit number is encoded with component code name by certain rule, wherein first
Digital representation component code name, second digit indicates output number number, such as capacitor C11, first 1 represent capacitor C1 (or
Referred to as first capacitor), the capacitor C1 being expressed as in first via output circuit for second 1；Capacitor C12 expression is the second tunnel output electricity
Capacitor C1 in road；Resistance R11 indicates it is the resistance R1 in first via output circuit, and resistance R12 expression is the second tunnel output electricity
Resistance R1 in road.It is noted that for convenience, may hereafter omit wherein under certain this occasion indicates that output circuit is compiled
Number second digit, and be only retained as the first digit of component code name.
It is described in detail below in conjunction with principle and embodiment of the attached drawing to invention.
First embodiment
As shown in figure 3, the schematic diagram of the multiple-output electric power for first embodiment of the invention, a kind of multiple-output electric power,
Vice-side winding including at least two transformers, a vice-side winding form main output circuit (may be simply referred to as main road below),
His vice-side winding forms auxiliary output circuit (may be simply referred to as bypass below), can according to need the timing control that main output circuit is arranged
The sequential control circuit 20 of circuit 10 processed and auxiliary output circuit, to realize that the timesharing sequence power supply of multichannel equipment in application system needs
It wants；Can also there was only the sequential control circuit 10 of main output circuit or the sequential control circuit 20 of auxiliary output circuit.Timing control
Structure of the circuit in main and auxiliary output circuit is identical, now illustrates this hair by taking the sequential control circuit 10 of main output circuit as an example
Bright multiple-output electric power, sequential control circuit 10 include metal-oxide-semiconductor Q11, resistance R11 and capacitor C11, and metal-oxide-semiconductor Q11 seals in secondary side
Between winding Ns11 and output stage Vo1, i.e. the drain electrode of metal-oxide-semiconductor Q11 is separately connected one end and the capacitor C11 of vice-side winding Ns11
One end, the source electrode of metal-oxide-semiconductor Q11 connect with output negative pole Vo1-, the grid of metal-oxide-semiconductor Q11 be separately connected resistance R11 one end and
The other end of the other end of capacitor C11, resistance R11 is connect with output cathode Vo1+.
Now illustrate the working principle of the sequential control circuit by taking the main output circuit of two-way out-put supply as an example: power supply not on
When electric, metal-oxide-semiconductor Q1 is in off state, and when the power source is activated, main road output cathode Vo1+ is filled by resistance R1 to capacitor C1
Electricity, capacitor C1 both end voltage are gradually increasing, and after a period of time, capacitor C1 both end voltage reaches the conducting voltage of metal-oxide-semiconductor Q1
When, the output all the way of metal-oxide-semiconductor Q1 conducting, power supply is established；When power supply, which disconnects, to be inputted, capacitor C1 both end voltage is gradually reduced, low
In metal-oxide-semiconductor Q1 conducting voltage, metal-oxide-semiconductor Q1 cut-off, power supply output is disconnected；Other bypass principles are also such.
According to actual needs, the time t1 and t2 established per output voltage all the way can be set, electricity is designed according to t1 and t2
The timing conducting of every road output as needed can be realized in the parameter of component in road.Calculation formula is as follows:
Note: VQFor the conducting voltage of metal-oxide-semiconductor, Vo+ is the output voltage of power supply, and t is the settling time of output voltage, and R is
The resistance value of resistance, C are the capacitance of capacitor.When such as designing the sequential control circuit 10 of main output circuit, calculation formula is as follows,
When designing the sequential control circuit 20 of auxiliary output circuit, calculation formula is as follows,
Wherein,
VQ11: metal-oxide-semiconductor Q11 conducting voltage；VQ12: metal-oxide-semiconductor Q12 conducting voltage；
Vo1+: the main road output voltage of power supply；Vo2+: the bypass output voltage of power supply；
T1: the settling time of main road output voltage；T2: the settling time of bypass output voltage；
R11: the resistance value of resistance R1 in main road, R12: the resistance value of resistance R1 in bypass；
C11: the capacitance of capacitor C1 in main road, C12: the capacitance of capacitor C1 in bypass.
Multiple-output electric power of the present invention, the delay service time respectively exported by sequential control circuit, that is, controllable power,
It is formed and establishes each road output according to timing, so that existing multiple control of product are improved to the single multiple-output electric power control of product
Realize, significantly reduce cost, save use space, but also do not influence the safety between former secondary side, each output every
From the reliability of power supply product will not be reduced.When the invention circuit is used for the Switching Power Supply of doubleway output or more, effect is more bright
It is aobvious.
Second embodiment
As shown in figure 4, the schematic diagram of the multiple-output electric power for second embodiment of the invention, a kind of multiple-output electric power,
Different from the first embodiment the voltage-stabiliser tube Z1 that connects between the anode of capacitor C1 and metal-oxide-semiconductor Q1 driving foot；That is voltage-stabiliser tube
Z1 seal in metal-oxide-semiconductor Q1 grid and resistance R1, capacitor C1 connecting pin between, the grid of the anode of voltage-stabiliser tube Z1 and metal-oxide-semiconductor Q1
Pole connection, the cathode of voltage-stabiliser tube Z1 are separately connected one end of resistance R1 and the other end of capacitor C1.
Now illustrate that its connection relationship is as follows by taking the sequential control circuit of main output circuit as an example: sequential control circuit includes
Metal-oxide-semiconductor Q11, resistance R11, capacitor C11 and voltage-stabiliser tube Z11, metal-oxide-semiconductor Q11 are sealed between vice-side winding Ns11 and output stage Vo1,
That is the drain electrode of metal-oxide-semiconductor Q11 is separately connected one end of vice-side winding Ns11 and one end of capacitor C11, the source electrode of metal-oxide-semiconductor Q11 with it is defeated
The grid of cathode Vo1- connection out, metal-oxide-semiconductor Q11 is connect with the anode of voltage-stabiliser tube Z11, and the cathode of voltage-stabiliser tube Z11 is separately connected electricity
It hinders one end of R11 and the other end of capacitor C11, the other end of resistance R11 is connect with output cathode Vo1+.
The effect for increasing zener diode Z11 is the Voltage Establishment time for extending sequence circuit.
Now illustrate the working principle of the sequential control circuit by taking the main output circuit of two-way out-put supply as an example: power supply not on
When electric, metal-oxide-semiconductor Q1 is in off state, and when the power source is activated, main road output cathode Vo+ charges by resistance R1 to capacitor C1,
Capacitor C1 both end voltage is gradually increasing, after a period of time, capacitor C1 both end voltage greater than voltage-stabiliser tube Z1 clamp voltage and
Breakdown conducting, when reaching the conducting voltage of metal-oxide-semiconductor Q1, the output all the way of metal-oxide-semiconductor Q1 conducting, power supply is established；When power supply disconnection is defeated
Fashionable, capacitor C1 both end voltage is gradually reduced, and is lower than metal-oxide-semiconductor Q1 conducting voltage, metal-oxide-semiconductor Q1 cut-off, and power supply output disconnects；Other
Bypass principle is also such.
The breakdown voltage of voltage-stabiliser tube Z1 > metal-oxide-semiconductor Q1 conducting voltage.According to actual needs, it can set per output electricity all the way
The time t1 and t2 established is pressed, the parameter of component in circuit is designed according to t1 and t2, every road output can be realized as needed
Timing conducting.Calculation formula is as follows:
Note: VZFor the breakdown voltage of voltage-stabiliser tube, Vo+ is the output voltage of power supply, and t is the settling time of output voltage, and R is
The resistance value of resistance, C are the capacitance of capacitor.When such as designing the sequential control circuit of main output circuit, calculation formula is as follows,
When designing the sequential control circuit of auxiliary output circuit, calculation formula is as follows,
Wherein,
VZ11: the breakdown voltage of voltage-stabiliser tube Z11；VZ12: the breakdown voltage of voltage-stabiliser tube Z12；
Vo1+: the main road output voltage of power supply；Vo2+: the bypass output voltage of power supply；
T1: the settling time of main road output voltage；T2: the settling time of bypass output voltage；
R11: the resistance value of resistance R1 in main road, R12: the resistance value of resistance R1 in bypass；
C11: the capacitance of capacitor C1 in main road, C12: the capacitance of capacitor C1 in bypass.
The time t that first setting output is established, rule of thumb can first determine capacitor C11, then calculate the value of R11, steady to guarantee
The breakdown conducting of pressure pipe and consideration device parameters error, the practical value of R11 can be a little bit smaller again.
The working principle of power supply another output and consistent above, setting timing time t2, substitute into formula on demand and calculate
?.
Triode is switching device in power circuit, also can choose other switching devices such as metal-oxide-semiconductor, still in this patent
Within protection scope.
Test verifying:
Condition: the product of this embodiment is doubleway output product, exports 12V all the way, exports 24V all the way, now require product
12V output voltage is established after 1000ms after powering on, and 24V output voltage is established after 2000ms；Fig. 4-1 and Fig. 4-2 difference
The test waveform figure established for the output voltage of 24V output and 12V output, in which:
Port CH1: input voltage waveform, port CH2:24V output voltage waveforms, port CH3:12V output voltage waveforms.
It can be seen that 24V from wave row and export settling time as 2087ms, and 12V exports 1028ms, almost with design specification
Unanimously, there is the error of the reason of error mainly device, in the charging time of the VCC voltage of IC, when design need to consider error.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as this
The limitation of invention, on the basis of attached drawing functional block diagram of the present invention, for those skilled in the art, not
It is detached from the spirit and scope of the present invention, alternatively improved and retouching can also be made, such as by control circuit amplifier and three
The circuit substitution of pole pipe composition, is still able to achieve identical function, these improve and retouch also in protection scope of the present invention, here not
It is repeated again with embodiment, protection scope of the present invention should be defined by the scope defined by the claims..
Claims (7)
1. a kind of multiple-output electric power, the vice-side winding including at least two transformers, a vice-side winding form main output electricity
Road, other vice-side windings form auxiliary output circuit, it is characterised in that:
Sequential control circuit is added in auxiliary output circuit, sequential control circuit includes metal-oxide-semiconductor, resistance and capacitor, and metal-oxide-semiconductor seals in pair
Between side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected one end of vice-side winding and one end of capacitor, the source of metal-oxide-semiconductor
Pole is connect with output negative pole, and the grid of metal-oxide-semiconductor is separately connected one end of resistance and the other end of capacitor, the other end of resistance with it is defeated
Anode connection out.
2. multiple-output electric power according to claim 1, it is characterised in that: the main output circuit also adds timing control
Circuit, sequential control circuit include metal-oxide-semiconductor, resistance and capacitor, metal-oxide-semiconductor seals between vice-side winding and output stage, i.e. metal-oxide-semiconductor
Drain electrode is separately connected one end of vice-side winding and capacitor, and the source electrode of metal-oxide-semiconductor is connect with output negative pole, and the grid of metal-oxide-semiconductor connects respectively
One end of connecting resistance and the other end of capacitor, the other end of resistance are connect with output cathode.
3. multiple-output electric power according to claim 1 or 2, it is characterised in that: the sequential control circuit further includes steady
Pressure pipe, voltage-stabiliser tube seal in metal-oxide-semiconductor grid and resistance, capacitor connecting pin between, i.e. the grid of the anode of voltage-stabiliser tube and metal-oxide-semiconductor
Connection, the cathode of voltage-stabiliser tube are separately connected one end of resistance and the other end of capacitor.
4. a kind of multiple-output electric power, the vice-side winding including at least two transformers, a vice-side winding form main output electricity
Road, other vice-side windings form auxiliary output circuit, it is characterised in that:
Sequential control circuit is added in auxiliary output circuit, sequential control circuit includes metal-oxide-semiconductor, resistance and capacitor, and metal-oxide-semiconductor seals in pair
Between side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected a pole of vice-side winding and capacitor, the source electrode of metal-oxide-semiconductor with it is defeated
Cathode connects out, and the grid of metal-oxide-semiconductor is separately connected one end of resistance and the other end of capacitor, the other end and output cathode of resistance
Connection；The output voltage settling time of sequential control circuit follows following relational expression:
Wherein, VQ is the conducting voltage of metal-oxide-semiconductor, and Vo+ is the output voltage of power supply, and t is the settling time of output voltage, and R is electricity
The resistance value of resistance, C are the capacitance of capacitor.
5. multiple-output electric power according to claim 4, it is characterised in that: the main output circuit also adds timing control
Circuit, sequential control circuit include metal-oxide-semiconductor, resistance and capacitor, metal-oxide-semiconductor seals between vice-side winding and output stage, i.e. metal-oxide-semiconductor
Drain electrode is separately connected one end of vice-side winding and capacitor, and the source electrode of metal-oxide-semiconductor is connect with output negative pole, and the grid of metal-oxide-semiconductor connects respectively
One end of connecting resistance and the other end of capacitor, the other end of resistance are connect with output cathode.
6. a kind of multiple-output electric power, the vice-side winding including at least two transformers, a vice-side winding form main output electricity
Road, other vice-side windings form auxiliary output circuit, it is characterised in that:
Sequential control circuit is added in auxiliary output circuit, sequential control circuit includes metal-oxide-semiconductor, resistance, capacitor and voltage-stabiliser tube, MOS
Pipe seals between vice-side winding and output stage, i.e. the drain electrode of metal-oxide-semiconductor is separately connected a pole of vice-side winding and capacitor, metal-oxide-semiconductor
Source electrode is connect with output negative pole, and the grid of metal-oxide-semiconductor and the anode of voltage-stabiliser tube connect, and the cathode of voltage-stabiliser tube is separately connected the one of resistance
The other end of end and capacitor, the other end of resistance are connect with output cathode；Wherein, the breakdown voltage of voltage-stabiliser tube is greater than metal-oxide-semiconductor
The output voltage settling time of conducting voltage, sequential control circuit follows following relational expression:
Wherein, VZFor the breakdown voltage of voltage-stabiliser tube, Vo+ is the output voltage of power supply, and t is the settling time of output voltage, and R is electricity
The resistance value of resistance, C are the capacitance of capacitor.
7. multiple-output electric power according to claim 6, it is characterised in that: the main output circuit also adds timing control
Circuit, sequential control circuit include metal-oxide-semiconductor, resistance, capacitor and voltage-stabiliser tube, and metal-oxide-semiconductor seals between vice-side winding and output stage, i.e.,
The drain electrode of metal-oxide-semiconductor is separately connected a pole of vice-side winding and capacitor, and the source electrode of metal-oxide-semiconductor is connect with output negative pole, the grid of metal-oxide-semiconductor
It is connect with the anode of voltage-stabiliser tube, the cathode of voltage-stabiliser tube is separately connected one end of resistance and the other end of capacitor, the other end of resistance
It is connect with output cathode.
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