CN104426127B - A kind of load starting circuit - Google Patents
A kind of load starting circuit Download PDFInfo
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- CN104426127B CN104426127B CN201310400452.4A CN201310400452A CN104426127B CN 104426127 B CN104426127 B CN 104426127B CN 201310400452 A CN201310400452 A CN 201310400452A CN 104426127 B CN104426127 B CN 104426127B
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Abstract
The invention provides a kind of load starting circuit, including：Input, including input anode and input cathode, for receiving electric energy from power supply；Output end, including output head anode and negative pole of output end, for providing electric energy to load；Energy-storage units, it is connected between input anode and input cathode, and for providing electric energy to output head anode and negative pole of output end；Switch element, for control output end whether to load provide electric energy；And under-voltage detection and control unit, for detecting the energy in the energy-storage units, and according to the disconnection or conducting of the testing result control switch element.Load starting circuit provided by the invention, can proof load normal work, stepped starting need not be loaded again.
Description
Technical field
The present invention relates to a kind of load starting circuit, more particularly to a kind of load that need not load stepped starting to start electricity
Road.
Background technology
For being connected to the load of a direct voltage source, maximum load power should be equal to or less than power supply
Peak power.However, the power of the start-up course of some loads is possible to the peak power that can exceed power supply.So, power supply
Output voltage will reduce.For some loads（Such as digit chip）, this Voltage Drop may cause element fault（Such as can not
Start）Or even damage.In this case, load can not normally start.
At present, common load starting circuit includes a current limiting unit（As shown in Figure 1）, with limitation load electricity
Stream exceedes a certain threshold value, so as to avoid falling for voltage.However, starting current is not more than normal work electricity by this circuit
This one kind load of stream is taken into account.If before this circuit is placed on into this foregoing one kind load, this load may be because
Electric current is constrained from normally starting.A kind of solution method is using load stepped starting, is started in the different time different
Load.Fig. 2 shows non-stepped starting（a）And stepped starting（b）Power demand contrast.Wherein load opening for stepped starting
The dynamic time will be longer, but the power demand started can be smaller, starts instantaneous power requirement so as to reduce.But load point
The structure of level start-up circuit is complex, and cost is high, it is also necessary to which software controls, and reliability is relatively low.
The content of the invention
The present invention is intended to provide a kind of load starting circuit, can proof load normal work, classification need not be loaded again
Start.
The present invention provides a kind of DC load start-up circuit, including：
Input, including input anode and input cathode, for receiving electric energy from power supply；
Output end, including output head anode and negative pole of output end, for providing electric energy to load；
Energy-storage units, it is connected between input anode and input cathode, and is used for output head anode and output end
Negative pole provides electric energy；
Switch element, whether electric energy is provided for control output end；And
Under-voltage detection and control unit, institute is controlled for detecting the energy in the energy-storage units, and according to testing result
The disconnection or conducting of switch element are stated,
Wherein, when the energy of the energy-storage units is less than a threshold value, described in the under-voltage detection and control unit control
Switch element is off-state, when the energy of the energy-storage units is more than or equal to a threshold value, the under-voltage detection and control
It is conducting state that unit, which controls the switch element,.When the switching means conductive, the energy-storage units and the power supply one
Rise to the load supplying.If the startup power of load is more than the peak power of power supply, then the extra startup needed for it
Power can be provided by energy-storage units, even if the startup power of load is more than the peak power of power supply, can also avoid voltage
Fall, it can also be ensured that load obtains sufficiently large electric current.
According to load starting circuit provided by the invention, wherein when starting to start, stored in the energy-storage units
Energy is zero.
According to load starting circuit provided by the invention, wherein the energy-storage units are made up of capacitor.
According to load starting circuit provided by the invention, wherein the switch element is by electronic switch or mechanical switch structure
Into.
According to load starting circuit provided by the invention, in addition to current limiting unit, for limiting input inflow
Electric current.
According to load starting circuit provided by the invention, wherein the under-voltage detection and control unit include divider and stagnant
Comparator is returned, the divider is parallel to the energy-storage units, and provides input voltage to the hysteresis loop comparator.
According to load starting circuit provided by the invention, wherein the divider by two be cascaded or two with
On resistor form.
According to load starting circuit provided by the invention, wherein the current limiting unit includes three terminal regulator and electricity
Resistance.
The present invention also provides a kind of load starter, including two or more loads as claimed in claim 1 start
Circuit, each load starting circuit is parallel with one another, and each self-corresponding load is respectively started.
According to load starter provided by the invention, wherein each switch element in each load starting circuit opens
The dynamic time is different.
According to load starter provided by the invention, the switch element ratio wherein corresponding to the relatively high load of priority
Switch element corresponding to the relatively low load of priority first turns on.Therefore the high load of priority is first started, it is rear to start preferentially
The low load of level, makes power be not more than power
According to load starter provided by the invention, wherein the energy of energy-storage units in each load starting circuit
Threshold value is different.
According to load starter provided by the invention, wherein energy-storage units corresponding to the relatively high load of priority
The threshold value of energy-storage units corresponding to the threshold value load relatively low less than priority.So that priority it is relatively high load institute it is right
The energy-storage units answered reach threshold value earlier, and then the switch element corresponding to the relatively high load of priority is led earlier
It is logical.
Load starting circuit provided by the invention can provide more starting currents in start-up course to load, and
Power overload situation will not be allowed, the load that startup power is more than normal power and power can perfectly be started.So both
Load normal work is can guarantee that, classification need not be loaded again.Meanwhile comprising undervoltage detection circuit can not only control and started
Journey, but also it is avoided that loaded work piece in the case of electric voltage exception.In addition, compared to load stepped starting, the present invention provides
Load starting circuit it is simple in construction, cost is low, does not need software control, reliability high.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein,
Fig. 1 is the load starting circuit of the prior art including current limiting unit；
Fig. 2 is non-stepped starting of the prior art（a）And stepped starting（b）Power demand；
Fig. 3 is the structural representation according to the load starting circuit of the present invention；
Fig. 4 is the structural representation according to the load starting circuit of embodiment 1；
Fig. 5 is the structural representation according to the load starting circuit of embodiment 2；
Fig. 6 is the structural representation of multiple load starting circuits according to an embodiment of the invention.
Reference numerals list
Power supply P；Load L；Current limiting unit 1,11,31,41；Switch element 2,12,22,32,42；Energy-storage units 3,
13、23、33、43；Under-voltage detection and control unit 4,14,24,34,44；Resistance R1, R2, R3, R4；Three terminal regulator 11a,
21a, hysteresis loop comparator HC
Embodiment
The invention provides a kind of DC load start-up circuit, for the starting load L in the presence of power supply P.The load
The structure of start-up circuit is as shown in figure 3, including current limiting unit 1, switch element 2, energy-storage units 3 and under-voltage detection and control
Unit 4 processed.The positive pole I+ and negative pole I- of the input of the load starting circuit are connected to power supply P, to receive electric energy from power supply P.
The positive pole O+ and negative pole O- of the output end of the load starting circuit are connected to load L, for providing electric energy to load.As load L
After being connected between the positive pole O+ of output end and negative pole O-, energy-storage units 3 are in parallel with load L, and are limited jointly with electric current after parallel connection
Unit 1 processed is series between the positive pole I+ and negative pole I- of power supply P input.The disconnection or conducting of switch element 2 determine defeated
Go out end whether to load L provide electric energy.Under-voltage detection and control unit 4 are used for the energy for detecting energy-storage units 3, work as energy-storage units
When 3 energy is not up to a certain energy threshold, under-voltage detection and the controlling switch unit 2 of control unit 4 are off-state, work as energy storage
When the energy of unit 3 reaches the energy threshold, under-voltage detection and the controlling switch unit 2 of control unit 4 are conducting state.
When starting to start, the energy stored in energy-storage units 3 is zero, and at this moment under-voltage detection and control unit 4 can make
Switch element 2 is off-state, so that output end does not provide electric energy to load L.Then, energy-storage units 3 will be filled by power supply P
Electricity is simultaneously finally reached a certain energy threshold.When energy-storage units reach the energy threshold, under-voltage detection and control unit 4 can make
Switch element 2 is conducting state so that output end to load L provide electric energy, now energy-storage units 3 together with power supply P to defeated
Go out end power supply.In this way, if load L startup power is more than power supply P peak power, then extra needed for it
Startup power can be provided by energy-storage units 3（Rather than all directly provided by power supply P）.Because energy-storage units 3 provide
Extra power completes starting load L process, therefore even if load L startup power is more than power supply P peak power,
Falling for voltage can be avoided, it can also be ensured that load L obtains sufficiently large electric current.
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now control illustrates this hair
Bright embodiment.
Embodiment 1
The present embodiment provides a kind of load starting circuit, for the starting load L in the presence of power supply P.The load starts
The structure of circuit is as shown in figure 4, including current limiting unit 11, switch element 12, energy-storage units 13 and under-voltage detection and control
Unit 14 processed.
Wherein energy-storage units 13 are in parallel with load L, and are being series at power supply P just with current limiting unit 11 jointly after parallel connection
Between negative pole, the energy-storage units 13 are made up of capacitor.
Switch element 12 is between load L and current limiting unit 11, including PMOS and resistance R4, the PMOS
Source electrode and drain electrode be connected respectively to current limiting unit 11 and load L, for make load L be connected to current limiting unit 11 or from
Current limiting unit 11 disconnects, that is, is used to make load L be connected to power supply P or disconnect from power supply P.Resistance R4 is connected in parallel on PMOS
Source electrode is between grid.
Under-voltage detection and control unit 14 are included by resistance R2 and resistance the R3 divider formed and hysteresis loop comparator HC.
Energy-storage units 13 are parallel to after wherein resistance R2 and resistance R3 series connection.Hysteresis loop comparator HC is made up of integrated operational amplifier, its
First input end is connected between resistance R2 and resistance R3, and the second input is connected to reference voltage Vref, with comparison resistance R2 and
Voltage and reference voltage V between resistance R3ref, hysteresis loop comparator HC output end is connected to the PMOS of switch element 12
Grid.Wherein reference voltage VrefIt is arranged to：When the voltage between resistance R2 and resistance R3 is less than a certain voltage threshold Vth
When, the voltage that comparator HC exports to the grid of PMOS disconnects switch element 12；Electricity between resistance R2 and resistance R3
Pressure is more than or equal to a certain voltage threshold VthWhen, the voltage that comparator HC exports to the grid of PMOS turns on switch element 12.
Current limiting unit 11 includes three terminal regulator 11a（It is the three terminal regulator of LM317L models in this embodiment）
With resistance R1, the V of three terminal regulatoroutVoltage difference with GND is not over a certain threshold value（Such as three for LM317L models
Hold for voltage-stablizer, the threshold value is 1.2V）, utilize the characteristic so that flow through and be connected to VoutOn resistance R1 between GND
Electric current is restricted, such as in the present embodiment not over 1.2V/R1.
When starting to start, the energy of the capacitor in energy-storage units 13 is zero, at this moment under-voltage detection and control unit 14
In hysteresis loop comparator HC switch element 12 can be made to be off-state so that load L with its outside circuit disconnect.So
Afterwards, energy-storage units 13 will be charged by power supply P, and the voltage being applied between resistance R2 and resistance R3 is stepped up, and works as rise
To voltage threshold VthWhen, the comparator HC in under-voltage detection and control unit 14 can turn on switch element 12, make load L connections
The circuit outside to it, so as to be activated.In this way, if load L startup power is more than power supply P maximum work
Rate, then the extra startup power needed for it can be provided by energy-storage units 13（Rather than all directly provided by power supply P）.
Because energy-storage units 13 provide extra power to complete starting load L process, therefore even if load L startup power is big
In power supply P peak power, falling for voltage can also be avoided, it can also be ensured that load L obtains sufficiently large electric current.
Embodiment 2
Can also not have current limiting unit in load starting circuit provided by the invention.Such as come for some power supplys
Say, in order to avoid falling for voltage, power source internal is integrated with current limiting unit.It is provided by the invention negative for this power supply
Current limiting unit can then be omitted by carrying in start-up circuit.In another example for some power supplys, it externally shows " electric current
The characteristic of limitation ", i.e., after electric current reaches a certain upper limit threshold, current limited, so as to prevent Voltage Drop.For this electricity
Source, current limiting unit can also be omitted in load starting circuit provided by the invention.
Therefore, for this power supply, the present embodiment provides a kind of load without current limiting unit and starts electricity
Road, its can avoid because electric current deficiency can not starting load situation.The structure of the load starting circuit is as shown in figure 5, bag
Include switch element 22, energy-storage units 23 and under-voltage detection and control unit 24.
Wherein energy-storage units 23 and load L are parallel between power supply P both positive and negative polarity, and the energy-storage units 23 are by capacitor structure
Into.
There is switch element 22 between load L and power supply P, the switch element 22 is made up of two PMOSs and resistance R4,
For making load L be connected to power supply P or being disconnected from power supply P.
Under-voltage detection and control unit 24 are included by resistance R2 and resistance the R3 divider formed and hysteresis loop comparator HC.
Energy-storage units 23 are parallel to after wherein resistance R2 and resistance R3 series connection.Comparator HC is made up of integrated operational amplifier, and it first
Input is connected between resistance R2 and resistance R3, and the second input is connected to reference voltage Vref, with comparison resistance R2 and resistance
Voltage and reference voltage V between R3ref, hysteresis loop comparator HC output end is connected to switch element 22.The wherein reference voltage
VrefIt is arranged to：When the voltage between resistance R2 and resistance R3 is less than a certain voltage threshold VthWhen, comparator HC is to switch element
The voltage of 12 outputs disconnects switch element 22；When the voltage between resistance R2 and resistance R3 is more than or equal to a certain voltage threshold Vth
When, the voltage that comparator HC exports to switch element 22 turns on switch element 22.
When starting to start, the energy of the capacitor in energy-storage units 23 is zero, at this moment under-voltage detection and control unit 24
In comparator HC switch element 22 can be made to be off-state so that load L with its outside circuit disconnect.Then,
Energy-storage units 23 will be charged by power supply P, and the voltage being applied between resistance R2 and resistance R3 is stepped up, when being increased to electricity
Press threshold value VthWhen, the hysteresis loop comparator HC in under-voltage detection and control unit 24 can turn on switch element 22, make load L connections
The circuit outside to it, so as to be activated.In this way, if load L startup power is more than power supply P maximum work
Rate, then the extra startup power needed for it can be provided by energy-storage units 23（Rather than all directly provided by power supply P）.
Because energy-storage units 23 provide extra power to complete starting load L process, therefore even if load L startup power is big
In power supply P peak power, falling for voltage can also be avoided, it can also be ensured that load L obtains sufficiently large electric current.
According to other embodiments of the invention, wherein current limiting unit is not limited to the structure in above-described embodiment, also
Can be other circuit units known in the art for playing current limit effect.
According to other embodiments of the invention, wherein switch element is not limited to the structure in above-described embodiment, except upper
State beyond this electronic switch being made up of electronic components such as transistors used in embodiment, this area can also have been used
The other constructions of switch known, such as mechanical switch structure.The connected mode of switch element in circuit is also not necessarily limited to above-mentioned implementation
Mode described in example.As long as it is arranged to add load L under under-voltage detection and the control of control unit
The present invention can be achieved with the switch element that electricity condition incision is changed is not added with electricity.
According to other embodiments of the invention, wherein energy-storage units are not limited to the capacitor described in above-described embodiment,
Can also be other circuit units known in the art for being capable of storage energy.
According to other embodiments of the invention, wherein under-voltage detection and control unit are not limited to described in above-described embodiment
Structure, such as the resistor of 3 or more can be included in divider, the first end of the hysteresis loop comparator is connected to wherein
Between two resistors.Under-voltage detection and control unit, which can also be that others are well known in the prior art, can realize under-voltage inspection
The part surveyed and controlled.Under-voltage detection and control unit are also not necessarily limited to the connected mode described in above-described embodiment, for example, removing
Outside this mode powered in above-described embodiment by power supply P, under-voltage detection and control unit can also be by outer beyond power supply P
Portion's power supply power supply.As long as be arranged to be triggered after the energy of energy-storage units reaches certain threshold value simultaneously controlling switch list
The present invention can be achieved in the under-voltage detection and control unit that member turns it on.
In the case that load starting circuit provided by the invention can be applied in multi-load, to solve multi-load startup
Problem.Such as shown in fig. 6, power supply P can be respectively started using two load starting circuits C1 and C2 two load L1 and L2,
Wherein load starting circuit C1 includes current limiting unit 31, switch element 32, energy-storage units 33 and under-voltage detection and control
Unit 34, load starting circuit C2 include current limiting unit 41, switch element 42, energy-storage units 43 and under-voltage detection and control
Unit 44 processed.
, can also be according to the significance level of load by multiple load partitions in addition, when applying when in the case of multi-load
Go out different startup priority：Critical loads priority is high, such as L1；Non-critical loads priority is low, such as L2.For priority height
Load, such as L1, its corresponding load starting circuit C1 be arranged to than load circuit C2 starting loads earlier, that is, switch
Unit 32 turns on earlier than switch element 31.Such as the threshold value of energy-storage units 33 can be made to be less than the threshold value of energy-storage units 43, from
And the threshold value of energy-storage units 33 is reached earlier, and then switch element 32 is turned on earlier than switch element 31.This
In the case of, during startup, the switch element 32 for critical loads L1 power supplies is first switched on, for the switch list of non-critical loads L2 power supplies
Turned on after member 42, it is rear to start the low load of priority so as to first start the high load of priority, power is not more than power supply work(
Rate.
Load starting circuit provided by the invention can provide more starting currents in start-up course to load, and
Power overload situation will not be allowed, the load that startup power is more than normal power and power can perfectly be started.So both
Load normal work is can guarantee that, classification need not be loaded again.Meanwhile comprising undervoltage detection circuit can not only control and started
Journey, but also it is avoided that loaded work piece in the case of electric voltage exception.In addition, compared to load stepped starting, the present invention provides
Load starting circuit it is simple in construction, cost is low, does not need software control, reliability high.
It should be appreciated that although this specification is described according to each embodiment, not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that those skilled in the art will should say for clarity
Bright book is as an entirety, and the technical solutions in the various embodiments may also be suitably combined, and forming those skilled in the art can be with
The other embodiment of understanding.
The schematical embodiment of the present invention is the foregoing is only, is not limited to the scope of the present invention.It is any
Those skilled in the art, equivalent variations, modification and the combination made on the premise of the design of the present invention and principle is not departed from,
The scope of protection of the invention all should be belonged to.
Claims (13)
1. a kind of DC load start-up circuit, including：
Input, including input anode and input cathode, for receiving electric energy from power supply；
Output end, including output head anode and negative pole of output end, for providing electric energy to load；
Energy-storage units (3,13,23,33,43), are connected between input anode and input cathode, and for rectifying to output
Pole and negative pole of output end provide electric energy；
Switch element (2,12,22,32,42), for control output end whether to load provide electric energy；And
Under-voltage detection and control unit (4,14,24,34,44), for detecting the energy in the energy-storage units, and according to detection
The disconnection or conducting of switch element described in output control；
Wherein, when the energy of the energy-storage units is less than a threshold value, the under-voltage detection and control unit control the switch
Unit is off-state, when the energy of the energy-storage units is more than or equal to a threshold value, the under-voltage detection and control unit
It is conducting state to control the switch element, and
Wherein, the under-voltage detection and control unit include divider and hysteresis loop comparator, and the divider is parallel to the storage
Energy unit, and provide input voltage to the hysteresis loop comparator.
2. load starting circuit according to claim 1, wherein when starting to start, stored in the energy-storage units
Energy is zero.
3. load starting circuit according to claim 1, wherein the energy-storage units include capacitor.
4. load starting circuit according to claim 1, wherein the switch element includes electronic switch.
5. load starting circuit according to claim 1, wherein the switch element includes mechanical switch.
6. load starting circuit according to claim 1, in addition to current limiting unit, for limiting input inflow
Electric current.
7. load starting circuit according to claim 1, wherein the divider is by two be cascaded or two
Resistor above is formed.
8. load starting circuit according to claim 6, wherein the current limiting unit includes three terminal regulator and electricity
Resistance.
9. one kind load starter, including two or more load starting circuits as claimed in claim 1, each load are opened
Dynamic circuit is parallel with one another, and each self-corresponding load is respectively started.
10. load starter according to claim 9, wherein each switch element in each load starting circuit
It is different to start the time.
11. load starter according to claim 10, wherein the switch list corresponding to the relatively high load of priority
Switch element corresponding to the member load more relatively low than priority first turns on.
12. load starter according to claim 9, wherein the energy of the energy-storage units in each load starting circuit
Threshold value it is different.
13. load starter according to claim 12, wherein the energy storage list corresponding to the relatively high load of priority
The threshold value of energy-storage units corresponding to the load relatively low less than priority of the threshold value of member.
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| CN201310400452.4A CN104426127B (en) | 2013-09-05 | 2013-09-05 | A kind of load starting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310400452.4A CN104426127B (en) | 2013-09-05 | 2013-09-05 | A kind of load starting circuit |
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| CN104426127A CN104426127A (en) | 2015-03-18 |
| CN104426127B true CN104426127B (en) | 2018-01-09 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109245512A (en) * | 2018-10-16 | 2019-01-18 | 珠海格力电器股份有限公司 | A kind of control method of big-power transducer, system, device and storage medium |
| CN110460029A (en) * | 2019-09-05 | 2019-11-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of power supply-distribution system |
| CN116317660B (en) * | 2023-03-28 | 2023-10-20 | 苏州腾圣技术有限公司 | Controllable inverter circuit |
| CN116914898A (en) * | 2023-09-14 | 2023-10-20 | 卧安科技(深圳)有限公司 | Power supply circuit and power supply method of intelligent equipment and intelligent equipment |
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| CN1209914A (en) * | 1996-01-23 | 1999-03-03 | 微动公司 | Intelligent power supply with staged loading capability |
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| CN201656861U (en) * | 2010-03-15 | 2010-11-24 | 李建军 | Starting circuit of solar brushless pump |
| CN101986222A (en) * | 2010-11-22 | 2011-03-16 | 襄垣县树元电器有限公司 | Multichannel load time program control device |
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| EP0220504A2 (en) * | 1985-10-01 | 1987-05-06 | Pulizzi Engineering, Inc. | Multiple time delay power controller apparatus |
| CN1209914A (en) * | 1996-01-23 | 1999-03-03 | 微动公司 | Intelligent power supply with staged loading capability |
| CN1701482A (en) * | 2003-08-05 | 2005-11-23 | 松下电器产业株式会社 | Direct-current power supply and battery-powered electronic apparatus equipped with the power supply |
| CN201656861U (en) * | 2010-03-15 | 2010-11-24 | 李建军 | Starting circuit of solar brushless pump |
| CN101986222A (en) * | 2010-11-22 | 2011-03-16 | 襄垣县树元电器有限公司 | Multichannel load time program control device |
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| CN104426127A (en) | 2015-03-18 |
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