CN104617763A - Power supply with long power guaranteeing time - Google Patents
Power supply with long power guaranteeing time Download PDFInfo
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- CN104617763A CN104617763A CN201310537375.7A CN201310537375A CN104617763A CN 104617763 A CN104617763 A CN 104617763A CN 201310537375 A CN201310537375 A CN 201310537375A CN 104617763 A CN104617763 A CN 104617763A
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Abstract
The invention provides a power supply for industrial control systems, comprising a first diode, a second diode, a first converter, a second converter, a capacitor, a switch, and an input voltage comparator. An input voltage passes through the first diode and is input to the first converter, and then a stable first direct voltage is output. The first converter is a buck DCDC converter. The input voltage passes through the first diode and is input to the second converter, then, a second direct voltage is output through buck conversion, and a third direct voltage is output through fly-buck conversion. The second converter is a fly-buck DCDC converter. The capacitor is charged by the third direct voltage. When receiving a control signal, the switch inputs electric energy of the capacitor to the first converter and the second converter through the second diode. The input voltage comparator compares the input voltage with a threshold, and outputs a control signal according to the comparison result to control the switch.
Description
Technical field
Relate generally to of the present invention is a kind of has the long power supply protecting the electricity time.More specifically, what relate to a kind of flyback step-down (fly-buck) circuit structure based on asynchronous, non-isolated has the long power supply protecting the electricity time.
Background technology
In industrial control system, Programmable Logic Controller (PLC) has carried out Industry Control action by the on/off operation of control relay usually.Because relay self exists the restriction of minimum operating voltage, therefore in order to ensure the proper operation of relay, the DCDC power requirement that the industrial control system that subtend comprises Programmable Logic Controller (PLC) and relay etc. is powered possesses certain guarantor's power when power remove, make the output voltage of power supply maintain a period of time.Here 2 requirements protected electricity and hold time are related generally to:
1. when input voltage interrupts 10ms(or miscellaneous stipulations time) time, export 24V voltage can not drop into relay working voltage (general 17V) below, export 5V and can not have fluctuation.
2., when input voltage turns off, exporting 5V needs to maintain a period of time (generally needing maintenance 50 to 200ms).
This needs enough energy-storage travelling wave tubes to realize above two requirements protected electricity and hold time with regard to making in power circuit.Capacitor is common energy-storage travelling wave tube, if but the capacitor meeting above-mentioned energy storage needs is placed at power inlet, then the capacitance of required capacitor is very large, the volume of capacitor is also very large, when this can cause on the one hand power initiation, impulse current is excessive, to providing the prime power supply of energy to add capacity requirement for power supply, too increase volume and the cost requirement of power supply self simultaneously.
And, owing to being subject to the restriction of relay minimum operating voltage, protecting electricity to hold time requirement, then for making two requirements meet if use same port capacitor to realize above-mentioned two, the capacitance of non-isolation DC/DC conversion needs the most general election by the two demand, and this can cause waste.
Such as: when input voltage interrupts 10mS, export 24V voltage and allow to drop into 17V from 20V, if power 25W, the capacitance selected meets 0.5*C*(20
2-17
2)=25W*10ms, then capacitance C=4500uF.
When inputting shutoff, from output voltage dropping into 17V, starting to decline to 5V, will meet the demands during this period of time.If require that for 60ms, 5V power output is 2W(now 24V output be 0 during this period of time), the minimum operating voltage that 24V turns the DCDC conversion of 5V is 7V, and the capacitance selected meets 0.5*C*(17
2-7
2)=2W*60ms, then capacitance C=1000uF.
Protect electricity to hold time requirement for meeting above-mentioned two simultaneously, the capacity of capacitor by large choosing, namely must select capacitance C=4500uF.
Fig. 1 is the basic block diagram with the power supply of long guarantor's electricity time conventional in industrial control system.
In FIG, from the input voltage 24V of external source via the 24V direct voltage of 24V-24V voltage-dropping type dcdc converter 1 stable output.From the input voltage 24V of external source via the 5V direct voltage of 24V-5V voltage-dropping type dcdc converter 2 stable output.Have at input port place and be multiplely connected in parallel on capacitor C1 ... between input voltage and ground, Cn, formed and meet long capacitance of protecting electric time requirement.The power supply architecture of Fig. 1 is simple, but inrush current is large, and volume is also large, expends space cost.
Fig. 2 is the another kind of basic block diagram with the power supply of long guarantor's electricity time conventional in industrial control system.
In fig. 2, employing is two-stage circuit method.Wherein from the input voltage 24V of external source via 24V-24V isolation or the 24V direct voltage (front stage circuits) of non-isolated flyback type dcdc converter 1 stable output.The output voltage 24V of dcdc converter 1 is via the 5V direct voltage (late-class circuit) of 24V-5V voltage-dropping type dcdc converter 2 stable output.Have the capacitor C1 of ground connection at dcdc converter 1 input port, have the capacitor C2 of ground connection at the output port place of dcdc converter 1, capacitor C1, C2 have the capacitance meeting the electric time requirement of long guarantor.Section 1 is protected electric time requirement and is completed by electric capacity 1, and Section 2 is protected electric time requirement and completed by electric capacity 2.The power supply of Fig. 2 effectively can utilize capacitance, reduces input port capacitance; But power is changed through two-stage, efficiency is low.
Fig. 3 is the third basic block diagram with the power supply of long guarantor's electricity time conventional in industrial control system.
Circuit shown in Fig. 3 is the typical apply of the patent (patent No. 201220549312.4) of Schneider Electric Industries SAS, employing be bypass lifting platen press.Wherein from the input voltage 24V of external source via being input to 24V-24V voltage-dropping type dcdc converter 1 after diode D1 with the 24V direct voltage of stable output.From the input voltage 24V of external source via being input to 24V-5V voltage-dropping type dcdc converter 2 after diode D1 with the 5V direct voltage of stable output.A bypass branch in parallel at the two ends of D1.This bypass branch comprises the 24V-36V step-up DC/DC converter 3 and 36V-24V voltage-dropping type dcdc converter 4 that are connected in series.The tie point of converter 3 and converter 4 has the capacitor C1 of ground connection, and capacitor C1 has and meets long capacitance of protecting electric time requirement.
Circuit shown in Fig. 3 reduces the capacitance of energy storage capacitor by the boosting of bypass branch, and control precisely simple, bypass branch does not cause loss substantially, and efficiency is higher.But the cost of two dcdc converters in bypass branch is higher; And because the circuit characteristic of the 24V-36V step-up DC/DC converter 3 in bypass branch, determine the inrush current that can not control whole power supply completely.
Fig. 4 is the 4th kind of basic block diagram with the power supply of long guarantor's electricity time studying use in industrial control system.
Power acquisition in the diagram be two-way bypass DCDC method, it adds the dcdc converter 3 of a 24V-36V boosting/36V-24V reducing two-way on the basis of Fig. 1 power supply, one end of converter 3 connects the input voltage 24V from external source, the other end of converter 3 connects the energy storage capacitor C1 of a ground connection, and capacitor C1 has the capacitance meeting the electric time requirement of long guarantor.
When power supply normally works, be output voltage 36V from the input voltage 24V of external source via the boosting inverter of converter 3, and charging is carried out to capacitor C1 carry out stored energy.When input voltage short interruption or the shutoff of power supply, the electric energy on capacitor C1 provides electric energy for output voltage 24V to continue as converter 1,2 via the decompression transformation of converter 3, realizes the long of power supply and protects the electricity time.
The device that circuit shown in Fig. 4 uses is less, and control precision is high, and efficiency is high; But the control method of bidirectional DC/DC conversion is more complicated, and same because the circuit characteristic of the 24V-36V step-up DC/DC conversion in converter 3, determine the inrush current that can not control whole power supply completely.
Therefore, need to manage to find a kind of DCDC power supply that can overcome the industrial control system of above-mentioned shortcoming, it has the longer guarantor electricity time, less inrush current and impulse current is completely controlled, higher conversion efficiency, lower cost, reduces the capacitance of energy storage capacitor simultaneously and then reduces the volume of power supply.
Summary of the invention
According to an aspect of the present invention, provide a kind of power supply for industrial control system, comprising: the first diode; Second diode; First converter, input voltage is via being input to the first converter with the first direct voltage of stable output after the first diode, wherein said first converter is voltage-dropping type dcdc converter; Second converter, input voltage is via being input to the second converter after the first diode with the second direct voltage exported by decompression transformation, and by the 3rd direct voltage that flyback converter exports, wherein said second converter is flyback voltage-dropping type dcdc converter; Capacitor, utilizes the 3rd direct voltage to charge for capacitor; Switch, when receiving a control signal, is input to the first converter and the second converter by the electric energy of capacitor via the second diode; Input voltage comparator, compares input voltage and a threshold value, exports control signal to control switch according to comparative result.
Wherein, by forming described second converter by the commutation inductance device of a voltage-dropping type dcdc converter increasing by one group of coil; The output of wherein said coil forms commutating circuit via the 3rd diode D3 of series connection, the described capacitor of ground connection; Wherein, the turn ratio of described coil and inductor makes the output voltage of commutating circuit be voltage higher than input voltage.
Wherein, described switch has the function of single-pole double throw, and realizes by a N-type mosfet transistor and a P type mosfet transistor.
Wherein, if input voltage is greater than threshold value, then power supply normally works, the control signal of input voltage comparator not output control switch action, now, switch is in normally-closed contact on-state, and the 3rd direct voltage that the second converter is exported charges to capacitor; If input voltage is less than or equal to threshold value, then power supply is in and protects electric operating state, the signal of input voltage comparator output control switch action, now, switch is in normally open contact on-state, makes the electric energy of capacitor be input to the first converter and the second converter via the second diode.
Wherein, input voltage is 24V, and the first direct voltage is 24V, and the second direct voltage is 5V, and the 3rd direct voltage is 36V, and threshold value is 17V.
The long power supply protecting the electricity time that has of flyback step-down (fly-buck) circuit structure based on asynchronous, non-isolated of the present invention achieves the long of DCDC power supply and protects the electricity time, accomplishes that high efficiency and input port electric capacity minimize simultaneously.
Accompanying drawing explanation
By following only exemplarily and description of writing by reference to the accompanying drawings, for one, this area technical staff, example embodiment of the present invention will better be understood and more obvious, in accompanying drawing:
Fig. 1 is the basic block diagram with the power supply of long guarantor's electricity time conventional in industrial control system;
Fig. 2 is the another kind of basic block diagram with the power supply of long guarantor's electricity time conventional in industrial control system;
Fig. 3 is the third basic block diagram with the power supply of long guarantor's electricity time conventional in industrial control system;
Fig. 4 is the 4th kind of basic block diagram with the power supply of long guarantor's electricity time studying use in industrial control system;
Fig. 5 is the basic block diagram with the power supply of long guarantor's electricity time according to the embodiment of the present invention;
Fig. 6 is a kind of detailed circuit diagram with the power supply of long guarantor's electricity time according to the embodiment of the present invention.
Embodiment
The power supply with long guarantor's electricity time according to the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
See the basic block diagram with the power supply of long guarantor's electricity time that Fig. 5, Fig. 5 are according to the embodiment of the present invention.
In Figure 5, by increase by one group of coil W1 on the commutation inductance device L of the 24V-5V voltage-dropping type dcdc converter 2 by Fig. 1,24V-5V voltage-dropping type dcdc converter 2 is made to become flyback voltage-dropping type dcdc converter.
In Figure 5, from the input voltage 24V of external source via being input to 24V-24V voltage-dropping type dcdc converter 1 after diode D1 with the 24V direct voltage of stable output.From the input voltage 24V of external source via being input to 24V-5V flyback voltage-dropping type dcdc converter 2 after diode D1 with the 5V direct voltage of stable output.
In Figure 5, by increase by one group of coil W1 on the commutation inductance device L of the 24V-5V voltage-dropping type dcdc converter 2 by Fig. 1, form transformer T1, the output of coil W1 forms commutating circuit via diode D3, the ground connection energy storage capacitor C1 connected, and this is a kind of flyback step-down circuit structure.The turn ratio of coil W1 and inductor L makes the output voltage of commutating circuit be 36V.
Input voltage from external source is also input to input voltage comparator 3, the threshold value of input voltage with such as 17V compares by input voltage comparator 3, if input voltage is greater than threshold value, then power supply normally works, input voltage comparator 3 does not export the signal of interrupteur SW 1 action controlling single-pole double throw, that is, now, interrupteur SW 1 is in normally-closed contact on-state.The commutating circuit of above-mentioned flyback step-down circuit is connected, and ground connection energy storage capacitor C1 is by charging energy-storing.
If input voltage is less than or equal to threshold value, then judges that input voltage is under-voltage, interrupt or turn off, power supply should be in protects electric operating state, now, input voltage comparator 3 exports the signal of interrupteur SW 1 action controlling single-pole double throw, namely, now, interrupteur SW 1 is in normally open contact on-state.Make ground connection energy storage capacitor C1 continue as converter 1 via diode D2 and converter 2 provides electric energy, realize the long of power supply and protect the electricity time.
In Fig. 5, not from 24V input voltage mouth to the charging of energy storage capacitor C1, but from coming from the flyback reduction voltage circuit of 5V output loop.Energy storage capacitor C1 and 24V input voltage mouth is made to separate completely like this, the charging process of energy storage capacitor C1 is all the time through 24V-5V voltage-dropping type dcdc converter 2 current limliting, the defect that the electric current that there is not boost converter circuit in Fig. 3,4 can not control completely, can must control impulse current by the current-limiting points of voltage-dropping type dcdc converter very well.Use input voltage comparator 3, the action of the accurate control switch SW1 of energy switches simultaneously.
Compare with the power supply architecture of Fig. 3, the power supply according to the embodiment of the present invention shown in Fig. 5 greatly can save cost.Such as, in the booster converter 3 of Fig. 3 bypass branch and buck converter 42 integrated chips containing mosfet transistor 2 inductance that can replace in the interrupteur SW 1 of Fig. 5 and the booster converter 3 of input voltage comparator 3, Fig. 3 bypass branch and buck converter 4 can replace to the transformer T1 coil W1 of Fig. 5.
Shown in Fig. 5 according to the power supply of the embodiment of the present invention be a kind of flyback reduction voltage circuit structure based on asynchronous, non-isolated there is the long power supply protecting the electricity time.The shortcoming of the DCDC power supply of the industrial control system shown in Fig. 1-4 can be overcome according to the power supply of the embodiment of the present invention, there is the longer guarantor electricity time, less inrush current and impulse current is completely controlled, higher conversion efficiency, lower cost, reduces the capacitance of energy storage capacitor simultaneously and then reduces the volume of power supply.Achieve low cost, less controlled impulse current, less capacitor energy storage according to the power source design of the embodiment of the present invention shown in Fig. 5, and obtain power supply longer guarantor's electricity time.
Fig. 6 is a kind of detailed circuit diagram with the power supply of long guarantor's electricity time according to the embodiment of the present invention.
Based on the basic circuit structure of Fig. 5, those of ordinary skill in the art can realize the present invention by multiple concrete circuit.As concrete circuit realiration, Fig. 6 is only an example, therefore omits the description of its detail.
What deserves to be explained is, in figure 6, the interrupteur SW 1 of Fig. 5 can be realized by the N-type mosfet transistor M1 of series connection and P type mosfet transistor M2.
Although as described herein above example embodiment, understanding can have been carried out various amendment, replacement and/or change.
It will be understood by those skilled in the art that can carry out other to specific embodiment changes and/or amendment, and do not depart from the spirit or scope of the present invention as broadly described.Therefore, which point all the present embodiment to be thought illustrative and not restrictive from.
Claims (5)
1., for a power supply for industrial control system, comprising:
First diode;
Second diode;
First converter, input voltage is via being input to the first converter with the first direct voltage of stable output after the first diode, wherein said first converter is voltage-dropping type dcdc converter;
Second converter, input voltage is via being input to the second converter after the first diode with the second direct voltage exported by decompression transformation, and by the 3rd direct voltage that flyback converter exports, wherein said second converter is flyback voltage-dropping type dcdc converter;
Capacitor, utilizes the 3rd direct voltage to charge for capacitor;
Switch, when receiving a control signal, is input to the first converter and the second converter by the electric energy of capacitor via the second diode;
Input voltage comparator, compares input voltage and a threshold value, exports control signal to control switch according to comparative result.
2. as claimed in claim 1 for the power supply of industrial control system, wherein
By forming described second converter by the commutation inductance device of a voltage-dropping type dcdc converter increasing by one group of coil,
The output of wherein said coil forms commutating circuit via the 3rd diode D3 of series connection, the described capacitor of ground connection,
Wherein, the turn ratio of described coil and inductor makes the output voltage of commutating circuit be voltage higher than input voltage.
3. as claimed in claim 1 for the power supply of industrial control system, wherein
Described switch has the function of single-pole double throw, and realizes by a N-type mosfet transistor and a P type mosfet transistor.
4. as claimed in claim 3 for the power supply of industrial control system, wherein
If input voltage is greater than threshold value, then power supply normally works, the control signal of input voltage comparator not output control switch action, and now, switch is in normally-closed contact on-state, and the 3rd direct voltage that the second converter is exported charges to capacitor;
If input voltage is less than or equal to threshold value, then power supply is in and protects electric operating state, the signal of input voltage comparator output control switch action, now, switch is in normally open contact on-state, makes the electric energy of capacitor be input to the first converter and the second converter via the second diode.
5. the power supply for industrial control system as described in one of claim 1-4, wherein
Input voltage is 24V,
First direct voltage is 24V,
Second direct voltage is 5V,
3rd direct voltage is 36V,
Threshold value is 17V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310537375.7A CN104617763A (en) | 2013-11-04 | 2013-11-04 | Power supply with long power guaranteeing time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310537375.7A CN104617763A (en) | 2013-11-04 | 2013-11-04 | Power supply with long power guaranteeing time |
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| Publication Number | Publication Date |
|---|---|
| CN104617763A true CN104617763A (en) | 2015-05-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310537375.7A Pending CN104617763A (en) | 2013-11-04 | 2013-11-04 | Power supply with long power guaranteeing time |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106364682A (en) * | 2016-09-28 | 2017-02-01 | 成都凯天电子股份有限公司 | Uninterruptible emergency power supply system for flight parameter recorder |
| EP3772808A1 (en) * | 2019-08-05 | 2021-02-10 | Hamilton Sundstrand Corporation | Power converter |
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| JPH02220579A (en) * | 1989-02-22 | 1990-09-03 | Hitachi Ltd | Magnetic recording and reproducing device |
| CN2403063Y (en) * | 1999-09-21 | 2000-10-25 | 阿姆斯戴尔公司 | Integrated protection power supply |
| CN102223076A (en) * | 2011-06-25 | 2011-10-19 | 深圳航天科技创新研究院 | Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply |
| CN202160113U (en) * | 2011-08-16 | 2012-03-07 | 廊坊开发区新赛浦石油设备有限公司 | DC switch power supply |
| CN103001313A (en) * | 2011-09-08 | 2013-03-27 | 联正电子(深圳)有限公司 | Off-line uninterrupted power system |
-
2013
- 2013-11-04 CN CN201310537375.7A patent/CN104617763A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02220579A (en) * | 1989-02-22 | 1990-09-03 | Hitachi Ltd | Magnetic recording and reproducing device |
| CN2403063Y (en) * | 1999-09-21 | 2000-10-25 | 阿姆斯戴尔公司 | Integrated protection power supply |
| CN102223076A (en) * | 2011-06-25 | 2011-10-19 | 深圳航天科技创新研究院 | Magnetic isolated feedback circuit for Buck-type DC (direct current)/DC switching power supply |
| CN202160113U (en) * | 2011-08-16 | 2012-03-07 | 廊坊开发区新赛浦石油设备有限公司 | DC switch power supply |
| CN103001313A (en) * | 2011-09-08 | 2013-03-27 | 联正电子(深圳)有限公司 | Off-line uninterrupted power system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106364682A (en) * | 2016-09-28 | 2017-02-01 | 成都凯天电子股份有限公司 | Uninterruptible emergency power supply system for flight parameter recorder |
| EP3772808A1 (en) * | 2019-08-05 | 2021-02-10 | Hamilton Sundstrand Corporation | Power converter |
| US11258367B2 (en) | 2019-08-05 | 2022-02-22 | Hamilton Sundstrand Corporation | Power converter including self powered high voltage charging of a connected energy storage device |
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Application publication date: 20150513 |