CN103259328A - Continuous direct current power supply system - Google Patents
Continuous direct current power supply system Download PDFInfo
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- CN103259328A CN103259328A CN2013101800160A CN201310180016A CN103259328A CN 103259328 A CN103259328 A CN 103259328A CN 2013101800160 A CN2013101800160 A CN 2013101800160A CN 201310180016 A CN201310180016 A CN 201310180016A CN 103259328 A CN103259328 A CN 103259328A
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Abstract
The invention provides a continuous direct current power supply system. Power supply input of a first power supply chip and an enabling end of the first power supply chip are connected with a 5V voltage, a grounding end of the first power supply chip is directly connected with the ground, output pins are connected with a capacitor C1, a capacitor C2 and an input end of a Schmitt trigger, the capacitor C1 and the capacitor C2 are connected in parallel, the voltage anode of the Schmitt trigger is connected with a 5V voltage, a grounding end of the Schmitt trigger is connected with the ground, an output end of the Schmitt trigger is connected with an enabling end of a second power supply chip, an input voltage of the second power supply chip is 5V, the output end of the Schmitt trigger is connected with one end of a capacitor C3, the other end of the capacitor C3 is connected with the ground, an output end of the first power supply chip and an output end of the second power supply chip are connected together through a non-return diode and output a 3V voltage. The continuous direct current power supply system can continuously supply power when faults exist in the first power supply chip, and meanwhile the second power supply chip is started to work. The continuous direct current power supply system has the advantages of being few in circuit components and low in cost, weight and power consumption, increasing reliability and stability of the power supply system, and broadening the application environment of a design system.
Description
Technical field
The present invention relates to a kind of design based on uninterruptible power supply system in the duplicate supply failure of chip transfer process.
Background technology
Direct voltage is powered to be mainly used in to intelligent chip continuously and is powered, for example FPGA, ARM, DSP etc. these need electric current little, low chip consumes energy, because in case power supply breaks down or opens circuit, these chips just need reload program when powering on again, even also need to restart to the ancillary equipment of these chips, this not only loses time, and also increases power consumption simultaneously.Duplicate supply uninterruptible power supply system when having power supply chip to break down is comparatively complicated at present, and the chip that some system's design is adopted is more, causes cost price to rise.Design circuit weight increases, and brings bigger problem for fields such as Aero-Space.Simultaneously, the chip of employing is more many, and the probability that fault takes place is just more big.Therefore, need the chip use amount few, whole electric power system is light and handy, and is simple in structure, and the higher electric power system of reliability guarantees reliability and the continuity of powering.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of uninterrupted direct current (DC) power supply system, it is low to consume energy, and the chip use amount is little.
The technical solution adopted for the present invention to solve the technical problems is: comprise two power supply chips, two diodes, a Schmidt trigger and three electric capacity, termination 5V is imported and enabled to the power supply of a power supply chip, the direct ground connection of earth terminal, output pin connects the capacitor C 1 of 2 parallel connections, the input of C2 and Schmidt trigger, the positive polarity of Schmidt trigger connects 5V voltage, earth terminal ground connection, Enable Pin at No. two power supply chips of output termination of Schmidt trigger, the input voltage of No. two power supply chips is 5V, output termination capacitor C 3 one ends, capacitor C 3 other end ground connection; The output of a power supply chip and No. two power supply chips is connected together by a non-return diode respectively, output 3V voltage.
Described power supply chip adopts the LDO power supply chip of 2 TI companies.
The threshold voltage of described Schmidt trigger is 1.6～2.4V.
Described diode is Schottky diode, and threshold voltage is 0.2～0.3V.
The capacitance of described capacitor C 1
Wherein, ω is coefficient, ω〉1, t is discharge time, the t value equals sum start-up time of Schmidt trigger triggered time and No. two power supply chips; R is the resistance value of amounting to of power supply institute electric power system, V
TElectricity is the receptible minimum voltage value of electric power system; E is Schmidt trigger V
T-Magnitude of voltage.
Described capacitor C 2 and capacitor C 3 are selected the electric capacity of 10pF for use.
The invention has the beneficial effects as follows: the present invention does not utilize the devices such as Intelligent Measurement of control, can start No. two power supply chip work in the time of uninterrupted power supply when a power supply chip is out of order.The design of this Circuits System utilizes that device is less, cost is low, and quality is light, low-power consumption, and this more can increase the reliability and stability of electric power system, has widened the applied environment of this design system, or even aerospace field.
Description of drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Design of the present invention adopts the LDO power supply chip of 2 TI companies, is input as 5V voltage, is output as 3V voltage.The input voltage of Schmidt trigger is 5V, and threshold voltage is 1.6～2.4V.2 diodes in the circuit are Schottky diode, and (germanium diode, threshold voltage are 0.2～0.3V).C1 is big electric capacity, and its capacitance calculates as shown in Equation 1, the main work as storage of electrical energy.C2 and C3 select the electric capacity of 10pF usually for use, and main effect is filtering.
Wherein, ω is coefficient, ω〉1; C is the capacitance of capacitor C 1; T is discharge time, and the t value equals sum start-up time of Schmidt trigger triggered time and power supply 2 chips; R is the resistance value of amounting to of power supply institute electric power system, by estimations such as power consumptions; V
TElectricity is the receptible minimum voltage value of electric power system; E is Schmidt trigger V
T-Magnitude of voltage.
Design: termination 5V, the direct ground connection of earth terminal are imported and enabled to the power supply of power supply chip 1.Meet capacitor C 1 and the C2 of 2 parallel connections at the output pin of power supply chip 1, connect the input of Schmidt trigger simultaneously, the positive polarity of Schmidt trigger connects 5V voltage, earth terminal ground connection.Enable Pin at the direct power supply chip 2 of the output of Schmidt trigger.The input voltage of chip 2 is 5V, output termination capacitor C 3 one ends, other end ground connection.Output at power supply chip 1 and power supply chip 2 all connects a diode simultaneously, and output 3V voltage connects together.
When powering on, the power supply input pin of chip 1 and enable pin input 5V voltage, chip 2 input 5V voltages.Electric power system will output voltage when voltage output end is higher than threshold voltage 0.2～0.3V of D1, and after C1 and C2 were full of electricity, the voltage of output will normally be exported.In case when chip 1 broke down, chip 1 will quit work, at this time mainly be that capacitor C 1 begins discharge, and voltage is on a declining curve, is lower than the V of Schmidt trigger when a point voltage
T-The time, Schmidt trigger will overturn, and the voltage that b is ordered will become high level, make the Enable Pin of chip 2 high voltage of coming in and going out, at this moment chip 2 will start power supply, and when output voltage was higher than the threshold voltage of D2, whole electric power system will operate as normal.Capacitor C 1 chip 2 before discharging into 0.3V starts, and voltage is elevated to 0.3V, so just can guarantee the continuity of electric power system.In case chip 1 is not to damage fully, recovers operate as normal again, then the output of chip 1 is at the V of no show Schmidt trigger
T+The time Schmidt trigger can not reverse, along with voltage is elevated to V
T+The time, the Enable Pin of chip 2 will become low level, causes chip 2 to quit work, and this moment, whole electric power system was normal output voltage 3V.To power in the power supply transfer process be continuous uninterrupted to electric power system like this.
Referring to Fig. 1, the uninterrupted direct current (DC) power supply system of this enforcement adopts the single channel LDO chip of 2 TI companies to be input as 5V, is output as 3V, and Enable Pin is 3～5V.The V of Schmidt trigger
T+Be 2.4V, V
T-Be 1.6V, Vin is 5V, and the output HIGH voltage of OUT is about 4.4V, and reversing time is 15ns.Capacitor C 1 is the electric capacity of 10mF, and it mainly acts on is that electric power storage prevents that chip 1 from damaging and stops power supply, and the ability of emergency service is provided.Capacitor C 2 and C3 mainly act as filter action.Diode D1 and D2 adopt Schottky diode, and threshold voltage is 0.2～0.3V, and main effect is the unilateal conduction characteristic of utilizing diode.Under chip 1 normal condition, a point voltage is greater than V
T+, the OUT of Schmidt trigger end is output as low level like this, and the Enable Pin EN of chip 2 is low level.
When chip 1 was working properly, C1 was the state that is full of electricity, used in order to outage is urgent.At this moment, a voltage of ordering is 3V.In case chip 1 breaks down and stops power supply, C1 will begin discharge and present the supply power voltage downward trend, when voltage drops to V
T-In the time of voltage 1.6V, a point voltage is 1.6V, and Schmidt trigger will reverse then, and the voltage drop that b is ordered is high level by low transition, and chip 2 starts.When the voltage of chip 2 was higher than the threshold voltage of D2, the voltage that c is ordered was in rising trend and reach the voltage of 3V.
Whole capacitor C1 discharge from 1.6V drop to need the minimum voltage scope that electric system bears time necessarily greater than the chip 2 normal institute's time-consumings that start.
If in a single day chip 1 recovers operate as normal, capacitor C 1 can continue charging, and when a point voltage was higher than 2.4V, Schmidt trigger overturn, and chip 2 is stopped power supply.The c point voltage is remaining the continuous uninterrupted power supply.
Obviously, above-mentioned example only be for explanation the present invention with removing do for example, but not to the restriction of this invention execution mode.For those of ordinary skill in the field, can also do multi-form variation on the basis of the above description.Such as, the voltage of Schmidt trigger is not needed voltage, can carry out dividing potential drop in a point series resistance; Increase capacitor C 1, improve the designs such as minimum point voltage of power supply conversion.Here can't be exhaustive, but the apparent variation that spirit of the present invention is extended out or change are still among protection range.
Claims (6)
1. uninterrupted direct current (DC) power supply system, comprise two power supply chips, two diodes, a Schmidt trigger and three electric capacity, it is characterized in that: termination 5V is imported and enabled to the power supply of a power supply chip, the direct ground connection of earth terminal, output pin connects the capacitor C 1 of 2 parallel connections, the input of C2 and Schmidt trigger, the positive polarity of Schmidt trigger connects 5V voltage, earth terminal ground connection, Enable Pin at No. two power supply chips of output termination of Schmidt trigger, the input voltage of No. two power supply chips is 5V, output termination capacitor C 3 one ends, capacitor C 3 other end ground connection; The output of a power supply chip and No. two power supply chips is connected together by a non-return diode respectively, output 3V voltage.
2. uninterrupted direct current (DC) power supply system according to claim 1 is characterized in that: the LDO power supply chip of 2 TI companies of described power supply chip employing.
3. uninterrupted direct current (DC) power supply system according to claim 1, it is characterized in that: the threshold voltage of described Schmidt trigger is 1.6～2.4V.
4. uninterrupted direct current (DC) power supply system according to claim 1, it is characterized in that: described diode is Schottky diode, and threshold voltage is 0.2～0.3V.
5. uninterrupted direct current (DC) power supply system according to claim 1 is characterized in that: the capacitance of described capacitor C 1
Wherein, ω is coefficient, ω〉1, t is discharge time, the t value equals sum start-up time of Schmidt trigger triggered time and No. two power supply chips; R is the resistance value of amounting to of power supply institute electric power system, V
TElectricity is the receptible minimum voltage value of electric power system; E is Schmidt trigger V
T-Magnitude of voltage.
6. uninterrupted direct current (DC) power supply system according to claim 1, it is characterized in that: described capacitor C 2 and capacitor C 3 are selected the electric capacity of 10pF for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180016.0A CN103259328B (en) | 2013-05-15 | 2013-05-15 | Continuous direct current power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180016.0A CN103259328B (en) | 2013-05-15 | 2013-05-15 | Continuous direct current power supply system |
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| CN103259328A true CN103259328A (en) | 2013-08-21 |
| CN103259328B CN103259328B (en) | 2015-04-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114916U (en) * | 1992-01-11 | 1992-09-02 | 江西教育学院 | Dc ups power source |
| US5905365A (en) * | 1997-10-28 | 1999-05-18 | Twinhead International Corp. | Real time-clock power supply device |
| CN101087071A (en) * | 2006-05-02 | 2007-12-12 | 联发科技股份有限公司 | Power supply |
| CN202817754U (en) * | 2012-08-29 | 2013-03-20 | 吴桂林 | Uninterruptible-DC-voltage circuit |
-
2013
- 2013-05-15 CN CN201310180016.0A patent/CN103259328B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114916U (en) * | 1992-01-11 | 1992-09-02 | 江西教育学院 | Dc ups power source |
| US5905365A (en) * | 1997-10-28 | 1999-05-18 | Twinhead International Corp. | Real time-clock power supply device |
| CN101087071A (en) * | 2006-05-02 | 2007-12-12 | 联发科技股份有限公司 | Power supply |
| CN202817754U (en) * | 2012-08-29 | 2013-03-20 | 吴桂林 | Uninterruptible-DC-voltage circuit |
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| CN103259328B (en) | 2015-04-22 |
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