CN104967209B - A kind of heat death theory product electric power system - Google Patents
A kind of heat death theory product electric power system Download PDFInfo
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- CN104967209B CN104967209B CN201510330063.8A CN201510330063A CN104967209B CN 104967209 B CN104967209 B CN 104967209B CN 201510330063 A CN201510330063 A CN 201510330063A CN 104967209 B CN104967209 B CN 104967209B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a kind of heat death theory product electric power system, including main power supply circuit and stand-by power supply circuit, wherein, main power supply circuit include power supply output module, switch control module and and the first resistor current-limiting circuit and second resistance current-limiting circuit that connect, wherein, power supply output module, for being the farad capacitor charging in stand-by power supply circuit by first resistor current-limiting circuit and second resistance current-limiting circuit or being load supplying；Switch control module, for when the terminal voltage of farad capacitor is less than preset voltage value, control second resistance current-limiting circuit to disconnect；When the terminal voltage of farad capacitor is not less than preset voltage value, the current-limiting circuit conducting of control second resistance；Stand-by power supply circuit includes farad capacitor, for being load supplying as stand-by power supply.Heat death theory product electric power system disclosed by the invention, reduces the impact to charge power supply.In addition, for load supplying when, reduce the pressure drop of current supply circuit upper limit leakage resistance, improve power supplying efficiency.
Description
Technical field
The present invention relates to heat death theory product power supply technique field, more particularly to a kind of heat death theory product electric power system.
Background technology
Country carries out heat supply and presses heat charging, wherein a kind of meter greatly developed to carry out city heat supply system reform
Hot method is on-off time area method.This method require each household set one can break-make control valve, according to connecing for valve
Logical time and the construction area of each household, the heat recorded by building calorimeter are shared.
On-off controller must assure that the position for being when power is off maintained at out valve in existing heat death theory product, and this is just
It is required that also there is stand-by power supply except main power source to be had in on-off controller.Consider volume and cost, use farad capacitor
Turn into industry optimal selection as stand-by power supply.But due to the internal resistance very little of farad capacitor, only hundreds of milliohms, when it charges such as
Fruit does not carry out current limliting, can absorb instantaneous large-current by level power supply forward, produce a big dash current to preceding level power supply, seriously
When will make prime power protection in addition damage.So must be any limitation as to the charging current of farad capacitor, filled to alleviate electric capacity
To the impact of power supply when electric.And prior art is mainly by the way of current-limiting resistance current limliting, this mode cost is low, it is only necessary to
One power current-limiting resistance.But when main power source or stand-by power supply are load supplying and very big load current, power
Very big pressure drop is had on current-limiting resistance, makes its heating, and makes to be sent to the supply voltage step-down on late-class circuit, current-limiting resistance is got over
Greatly, the voltage of loss is more, but current-limiting resistance resistance is small and can not play metering function.
Therefore, when how a kind of impact and can to charge power supply when can reduce farad capacitor charging being provided reducing power supply
The heat death theory product electric power system of the pressure drop of current-limiting resistance is that those skilled in the art need to solve the problems, such as at present.
The content of the invention
It is an object of the invention to provide a kind of heat death theory product electric power system, during the entire process of being charged to farad capacitor
There is the current limliting of resistance current-limiting circuit, reduce the impact to charge power supply.In addition, when to load supplying, due to main power supply
The equal very little of loop internal resistance of circuit and stand-by power supply circuit, therefore, either main power supply circuit or stand-by power supply circuit are
Load supplying, the pressure drop of current-limiting resistance is reduced, improves power supplying efficiency.
In order to solve the above technical problems, the invention provides a kind of heat death theory product electric power system, including main power supply circuit
With stand-by power supply circuit, wherein, the main power supply circuit include power supply output module, switch control module and and connect first
Resistance current-limiting circuit and second resistance current-limiting circuit, wherein,
The power supply output module, for being by the first resistor current-limiting circuit and the second resistance current-limiting circuit
Farad capacitor in the stand-by power supply circuit charges or is load supplying；
The switch control module, for when the terminal voltage of the farad capacitor is less than preset voltage value, described in control
Second resistance current-limiting circuit disconnects；When the terminal voltage of the farad capacitor is not less than the preset voltage value, control described the
Two resistance current-limiting circuits turn on, wherein, the preset voltage value is according to the target charging voltage of the farad capacitor and described
The performance of second resistance current-limiting circuit is set；
The stand-by power supply circuit includes the farad capacitor, for being the load supplying as stand-by power supply.
Preferably, the second resistance current-limiting circuit includes PMOS current-limiting circuit and NMOS tube control circuit, wherein,
The NMOS tube control circuit, the break-make of itself is controlled for the control according to the switch control module, is entered
And control the break-make of the PMOS current-limiting circuit.
Preferably, the switch control module is specially metal-oxide-semiconductor switch control module, for according to the farad capacitor
The size of terminal voltage controls the break-make of the NMOS tube control circuit.
Preferably, the metal-oxide-semiconductor switch control module specifically includes the first divider resistance, the second divider resistance, clamper two
Pole pipe, protective resistance and filter capacitor, wherein,
The first end of first divider resistance is connected with the first end of the protective resistance, and is used as the metal-oxide-semiconductor
The input of switch control module, the second end of first divider resistance connect with the first end of second divider resistance,
The second end ground connection of second divider resistance, the second end of the protective resistance are connected with the opposite ends of the clamp diode,
The anode of the clamp diode is connected with the first end of the filter capacitor, the second end ground connection of the filter capacitor, described
The anode of clamp diode is connected with the second end of first divider resistance, and the second end of first divider resistance is as institute
The output end of metal-oxide-semiconductor switch control module is stated, is connected with the grid of the NMOS tube in the NMOS tube control circuit.
Preferably, the first resistor current-limiting circuit includes the first current-limiting resistance, and the PMOS current-limiting circuit includes
PMOS and the second current-limiting resistance, wherein, the first end of first current-limiting resistance is connected with the source electrode of the PMOS, and
It is connected with the output end of the power supply output module, the first end with second current-limiting resistance respectively that drains of the PMOS
And the first end connection for the peak electric capacity that disappears, the second end of first current-limiting resistance and the second end of second current-limiting resistance connect
Connect and be connected by diode with the first end of the 3rd current-limiting resistance, the second end ground connection of the peak electric capacity that disappears is described
The grid of PMOS is connected by resistance with the drain electrode of the NMOS tube.
Preferably, the stand-by power supply circuit also includes the 3rd current-limiting resistance, wherein, the first of the 3rd current-limiting resistance
End is connected with the input of the metal-oxide-semiconductor switch control module, the second end and the farad capacitor of the 3rd current-limiting resistance
First end connection, the farad capacitor the second end ground connection.
Preferably, the input voltage of the power supply output module is 9-24V, output voltage 5.6V.
Preferably, the target charging voltage of the farad capacitor is 5.3V.
Preferably, the Standard resistance range of first current-limiting resistance is more than 50 Ω, the resistance model of second current-limiting resistance
Enclose for 2 Ω -2.5 Ω.
Preferably, the Standard resistance range of the 3rd current-limiting resistance is 2 Ω -2.5 Ω.
A kind of heat death theory product electric power system provided by the invention, when the terminal voltage of the farad capacitor as stand-by power supply is small
When preset voltage value, now only first resistor current-limiting circuit charges for farad capacitor；When the farad electricity as stand-by power supply
When the terminal voltage of appearance is not less than preset voltage value, and the first resistor current-limiting circuit and second resistance current-limiting circuit connect is farad electricity
Capacity charge is load supplying, it is seen then that has the current limliting of resistance current-limiting circuit during the entire process of being charged to farad capacitor, subtracts
The small impact to charge power supply.In addition, when to load supplying, due to the loop of main power supply circuit and stand-by power supply circuit
The equal very little of internal resistance, therefore, either main power supply circuit or stand-by power supply circuit are load supplying, reduce current-limiting resistance
Pressure drop, improve power supplying efficiency.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of structural representation of heat death theory product electric power system provided by the invention；
Fig. 2 is the structural representation of another heat death theory product electric power system provided by the invention；
Fig. 3 is a kind of circuit theory diagrams of heat death theory product electric power system provided by the invention；
Fig. 4 is a kind of circuit theory diagrams of power supply output module provided by the invention；
Fig. 5 is a kind of circuit theory diagrams of metal-oxide-semiconductor switch control module provided by the invention；
Fig. 6 limits for a kind of first resistor current-limiting circuit, NMOS tube control circuit and PMOS of including provided by the invention
The circuit theory diagrams of current circuit；
Fig. 7 is a kind of circuit theory diagrams of stand-by power supply circuit provided by the invention.
Embodiment
The core of the present invention is to provide a kind of heat death theory product electric power system, during the entire process of being charged to farad capacitor
There is the current limliting of resistance current-limiting circuit, reduce the impact to charge power supply.In addition, when to load supplying, due to main power supply
The equal very little of loop internal resistance of circuit and stand-by power supply circuit, therefore, either main power supply circuit or stand-by power supply circuit are
Load supplying, the pressure drop of current-limiting resistance is reduced, improves power supplying efficiency.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment one
It refer to Fig. 1, Fig. 1 is a kind of structural representation of heat death theory product electric power system provided by the invention, the system
Including：
Main power supply circuit 1 and stand-by power supply circuit 2, wherein, main power supply circuit 1 includes power supply output module 11, switch control
Molding block 14 and and the first resistor current-limiting circuit 12 and second resistance current-limiting circuit 13 that connect, wherein,
Power supply output module 11, for being standby confession by first resistor current-limiting circuit 12 and second resistance current-limiting circuit 13
Farad capacitor 21 in circuit 2 charges or is load supplying；
Switch control module 14, for when the terminal voltage of farad capacitor 21 is less than preset voltage value, controlling second resistance
Current-limiting circuit 13 disconnects；When the terminal voltage of farad capacitor 21 is not less than preset voltage value, control second resistance current-limiting circuit 13
Conducting, wherein, preset voltage value is according to the target charging voltage of farad capacitor 21 and the performance of second resistance current-limiting circuit 13
To set；
Stand-by power supply circuit 2 includes farad capacitor 21, for being load supplying as stand-by power supply.
It is understood that it is understood that when the farad capacitor 21 in stand-by power supply circuit 2 need charging when, electricity
Source output module 11 has just begun by what first resistor current-limiting circuit 12 charged for farad capacitor 21, and due to farad capacitor 21
Terminal voltage be less than preset voltage value when just starting, therefore, switch control module 14 controls second resistance current-limiting circuit 13
Disconnect, namely can not turn on, then it is that farad capacitor 21 charges now there was only first resistor current-limiting circuit 12.
With the progress of charging process, the rise of the terminal voltage namely charging voltage of farad capacitor 21 is until farad capacitor 21
Terminal voltage reach preset voltage value, when the terminal voltage of farad capacitor 21 is more than or equal to preset voltage value, switch control
Module 14 controls second resistance current-limiting circuit 13 to turn on, then now first resistor current-limiting circuit 12 and second resistance current-limiting circuit 13
Parallel connection, charged jointly for farad capacitor 21.
In addition, when power supply output module 11 is load supplying, now output end (namely the farad electricity of main power supply circuit 1
Hold 21 anode) output supply voltage be necessarily greater than preset voltage value, then now second resistance current-limiting circuit 13 turns on,
The first resistor current-limiting circuit 12 and second resistance current-limiting circuit 13 that power supply output module 11 passes through parallel connection are load supplying.Due to
All-in resistance when first resistor current-limiting circuit 12 and second resistance current-limiting circuit 13 in parallel is than first resistor current-limiting circuit 12 and
Any one resistance in two resistance current-limiting circuits 13 is all small, thus when for load supplying when, in main current supply circuit current-limiting resistance
On pressure drop also very little.
Moreover, it is noted that preset voltage value here be according to the target charging voltage of farad capacitor 21 and
The performance of second resistance current-limiting circuit 13 is set.
When the farad capacitor 21 as stand-by power supply is load supplying by stand-by power supply circuit 2, due to stand-by power supply
The resistance resistance of itself is with regard to the resistance very little of very little, then whole stand-by power supply circuit 2, the resistance on whole stand-by power supply circuit 2
Pressure drop also very little.
A kind of heat death theory product electric power system provided by the invention, when the terminal voltage of the farad capacitor as stand-by power supply is small
When preset voltage value, now only first resistor current-limiting circuit charges for farad capacitor；When the farad electricity as stand-by power supply
When the terminal voltage of appearance is not less than preset voltage value, and the first resistor current-limiting circuit and second resistance current-limiting circuit connect is farad electricity
Capacity charge is load supplying, it is seen then that has the current limliting of resistance current-limiting circuit during the entire process of being charged to farad capacitor, subtracts
The small impact to charge power supply.In addition, when to load supplying, due to the loop of main power supply circuit and stand-by power supply circuit
The equal very little of internal resistance, therefore, either main power supply circuit or stand-by power supply circuit are load supplying, reduce current-limiting resistance
Pressure drop, improve power supplying efficiency.
Embodiment two
Fig. 2 is refer to, Fig. 2 is the structural representation of another heat death theory product electric power system provided by the invention, and this is
Unite and specifically included on the basis of the heat death theory product electric power system that embodiment one provides：
Second resistance current-limiting circuit includes PMOS current-limiting circuit 131 and NMOS tube control circuit 132, wherein,
NMOS tube control circuit 132, the break-make of itself is controlled for the control according to switch control module, and then controlled
The break-make of PMOS current-limiting circuit 131.
It is understood that now, preset voltage value is controlled according to the target charging voltage of farad capacitor 21, NMOS tube
The performance of circuit 132 and PMOS current-limiting circuit 131 is set.
Specifically, switch control module is specially metal-oxide-semiconductor switch control module 14, for the end electricity according to farad capacitor 21
The size of pressure controls the break-make of NMOS tube control circuit 132.
Further, metal-oxide-semiconductor switch control module 14 specifically includes the first divider resistance, the second divider resistance, clamper two
Pole pipe, protective resistance and filter capacitor, wherein,
The first end of first divider resistance and the first end of protective resistance connect, and are used as metal-oxide-semiconductor switch control module
14 input, the second end of the first divider resistance connect with the first end of the second divider resistance, and the second of the second divider resistance
The opposite ends of end ground connection, the second end of protective resistance and clamp diode connects, and the of the anode of clamp diode and filter capacitor
One end is connected, and the second end ground connection of filter capacitor, the anode of clamp diode is connected with the second end of the first divider resistance, and first
Output end of second end of divider resistance as metal-oxide-semiconductor switch control module 14, with the NMOS tube in NMOS tube control circuit 132
Grid connection.
Further, first resistor current-limiting circuit 12 includes the first current-limiting resistance, and PMOS current-limiting circuit 131 includes
PMOS and the second current-limiting resistance, wherein, the first end of the first current-limiting resistance and the source electrode of PMOS connect, and defeated with power supply
Go out the output end connection of module 11, the drain electrode of PMOS is respectively with the first end of the second current-limiting resistance and disappearing the first of peak electric capacity
End connection, the second end of the first current-limiting resistance is connected with the second end of the second current-limiting resistance and by diode and the 3rd current limliting
The first end connection of resistance 22, the second end ground connection for the peak electric capacity that disappears, the grid of PMOS are connected by the drain electrode of resistance and NMOS tube
Connect.
Further, stand-by power supply circuit 2 also includes the 3rd current-limiting resistance 22, wherein, the of the 3rd current-limiting resistance 22
One end is connected with the input of metal-oxide-semiconductor switch control module 14, and the of the second end of the 3rd current-limiting resistance 22 and farad capacitor 21
One end connects, the second end ground connection of farad capacitor 21.
Further, the input voltage of power supply output module 11 is 9-24V, output voltage 5.6V.
Further, the target charging voltage of farad capacitor 21 is 5.3V.
Further, the Standard resistance range of the first current-limiting resistance is that the Standard resistance range of the second current-limiting resistance is 2 more than 50 Ω
Ω-2.5Ω。
Further, the Standard resistance range of the 3rd current-limiting resistance 22 is 2 Ω -2.5 Ω.
Fig. 3 is refer to, Fig. 3 is a kind of circuit theory diagrams of heat death theory product electric power system provided by the invention.To make this
Scheme is become apparent from, and this programme is described with regard to a specific example below in conjunction with Fig. 3.
Fig. 4 is refer to, Fig. 4 is a kind of circuit theory diagrams of power supply output module provided by the invention, and the power supply exports mould
The input voltage of block 11 is 9-24V, output voltage 5.6V.
The present embodiment is from LM2596SX-ADJ power supply chips as switching power source chip, and LM2596 input range is very
Width, output voltage determine by R1 and R2 resistance, maximum output current 3A.The resistance that R1 can be chosen is 1k Ω, R2 resistance
It is worth for 3.4k Ω, now the output voltage of 2 pins is 5.6V, slightly above farad capacitor 2122 upper voltage limit 5.5V.It is electric in Fig. 4
The effect of sense L1 and all electric capacity is filtering, and D1 is commutation diode.Certainly, the present invention is for switching power source chip
Type selecting is not particularly limited, and can realize the switching power source chip of the object of the invention within protection scope of the present invention.
Moreover, it is noted that occur in the accompanying drawing that the application provides the 1% corresponding parameter of component referred to
Error range is no more than 1%.
Fig. 5 is refer to, Fig. 5 is a kind of circuit theory diagrams of metal-oxide-semiconductor switch control module provided by the invention,
In the present embodiment, the P-channel using the double metal-oxide-semiconductor FDC6327, FDC6327 of integrated NP allows the maximum current passed through
For 1.6A, the maximum current that N-channel allows to pass through is 2.7A, and FDC6327 is voltage control device, N, the unlatching threshold value of P channel
It is 0.9V.Unlike, the conducting of N-channel high level, the conducting of P-channel low level.Consideration supplements target voltage with money and is to the end
5.3V, therefore, the first divider resistance R10 take 430k Ω, the second divider resistance R9 to take 100k Ω, then calculated according to voltage division formulas
Arrive：
Then now equivalent to the output end voltage V of known metal-oxide-semiconductor switch control module 14OUTNamely VThreshold valueFor 0.9V, bring into
It is back-calculated to obtain
Then understand, as the input terminal voltage V of metal-oxide-semiconductor switch control module 14in(namely terminal voltage of farad capacitor 21) reaches
During to 4.77V, the output end voltage V of metal-oxide-semiconductor switch control module 14OUTReach the conduction threshold V of NMOS tube gridThreshold value, NMOS
Pipe control circuit 132 turns on, and NMOS tube control circuit 132 and then controls PMOS current-limiting circuit 131 to turn on.
It is understood that 4.77V here is preset voltage value, it is contemplated that the target charging voltage of farad capacitor 21
For 5.3V, in order that power supply output module 11 for load supplying when, the loop internal resistance of main power supply circuit is smaller, optimal
When state should be farad capacitor 21 fully charged (i.e. the charging voltage of farad capacitor 21 is 5.3V), metal-oxide-semiconductor switch control module
14 control NMOS tube control circuits 132 turn on and then control PMOS current-limiting circuit 131 to turn on, but due to the NMOS tube of reality
The performance of control circuit 132 and PMOS current-limiting circuit 131 limits, if switching again when farad capacitor 21 is fully charged,
It is possible to that the situation that NMOS tube control circuit 132 and PMOS current-limiting circuit 131 can not turn on occurs, therefore, typically can be
Deposited between the underfill of farad capacitor 21, namely the charging voltage of farad capacitor 21 and the output voltage 5.6V of power supply output module 11
The conducting of metal-oxide-semiconductor ON-OFF control circuit is controlled when certain pressure difference, but this pressure difference again can not be very big, otherwise due to PMOS
The current-limiting resistance very little of pipe current-limiting circuit 131, it is possible to produce high current, do not reach current limliting when being charged for farad capacitor 21
Purpose, therefore, consider target charging voltage, NMOS tube control circuit 132 and the PMOS current limliting electricity of farad capacitor 21
The performance on road 131, preset voltage value can be set to 4.77V.It is worth noting that, specific number of the present invention for preset voltage value
Value is not limited particularly, is determined on a case-by-case basis, and the preset voltage value of the object of the invention can be realized in the guarantor of the present invention
Within the scope of shield.
In addition, D4 is clamp diode, C8 is filter capacitor, and R11 is protective resistance, plays metering function.
Fig. 6 and Fig. 7 are refer to, wherein, Fig. 6 is provided by the invention a kind of including first resistor current-limiting circuit, NMOS tube
The circuit theory diagrams of control circuit and PMOS current-limiting circuit.Fig. 7 is a kind of electricity of stand-by power supply circuit provided by the invention
Road schematic diagram.
In Fig. 6, the first current-limiting resistance R3 plays metering function, limits the charging current of farad capacitor 21, while also limit
Disappear peak electric capacity C7 electric current.In addition, the peak electric capacity that disappears here can be tantalum electric capacity.
When the terminal voltage of farad capacitor 21 is less than 4.77V, current relation formula when farad capacitor 21 charges is：
Here voltages of the U3 for the defeated 5.6V power supplys of power supply output module 11 after diode D3, D3 model
SM5819, tube voltage drop 0.3V, then U3 is 5.3V.Farad capacitor 21 is 0 in charging initial time terminal voltage, namely now
UFaradFor 0, RFaradGenerally 300m Ω, the first current-limiting resistance R3 take 100 Ω, the 3rd current-limiting resistance 22R8 to take 2.5 Ω, by each numerical value
Formula 1 is substituted into, then it is 51.5mA to obtain maximum charging current when farad capacitor 21 charges.
When the terminal voltage of farad capacitor 21 is not less than 4.77V, PMOS current-limiting circuit 131 and first resistor current-limiting circuit
12 parallel connections are charged for farad capacitor 21, and now the first current-limiting resistance R3 and the second current-limiting resistance R7 is in parallel, substitute into R3=100 Ω,
R7=2.5 Ω, then now the current-limiting resistance of main power supply circuit is：
It is then R to the charge circuit all-in resistance of farad capacitor 21Always=RIt is main+R8+RFarad=5.24 Ω, then farad capacitor 21 charge
When current relation formula be：
Each numerical value is substituted into formula 2, then it is 100mA to obtain maximum charging current when farad capacitor 21 charges.It is appreciated that
Although that theory is worth to is 100mA, in fact, when PMOS current-limiting circuit 131 turns on, tantalum electric capacity (namely disappear
Peak electric capacity) C7 voltage can change to 5.6V, mutation voltage 0.53V from 5.07V (4.77+0.3).But tantalum electric capacity both end voltage can not
Mutation, now tantalum electric capacity is equivalent to integrator, and can disappear current peak, make the change of electric current become slow, so electric current is actual
Peak value is no more than 60mA.When power supply output module 11 output voltage and farad capacitor 21 terminal voltage pressure difference be 0 when, electricity
Source output module 11 charges to farad capacitor 21 all the time, until the terminal voltage of farad capacitor 21 is to 5.3V, in this course, fills
Electrical circuit all-in resistance is RAlwaysIt is constant, with power supply output module 11 output voltage and farad capacitor 21 terminal voltage pressure difference
It is gradually reduced, charge circuit electric current gradually tends to 0.
In summary, use PMOS current-limiting circuit 131 is in parallel with first resistor current-limiting circuit 12 to be filled for farad capacitor 21
Electricity, electric current maximum are no more than 60mA, then the power output P=5.6*0.06=0.336W of power supply output module 11.LM2596's
Transformation efficiency η 1 takes 80%, it is known that when the input voltage U1 of Power Entry Module removes the limit 9V, the electricity of power supply output module 11
Flow and be：
50mA electricity is at most drawn when i.e. farad capacitor 21 charges from power supply output module 11
Stream.
In the present embodiment, the target charging voltage of farad capacitor 21 is arranged to 5.3V, close to the upper limit of farad capacitor 21
Voltage 5.5V, therefore can more energy storage.
It is understood that it is divided into primary power source and secondary power supply in the on-off controller of heat death theory product, wherein, power supply
Output module 11 and farad capacitor 21 are that primary power source, power supply output module 11 or farad capacitor 21 provide just for secondary power supply
Beginning power supply, the power supply that primary power is converted to 3.3V by secondary power supply is load supplying below.
When the motor rotation blockage as one of load, load current is maximum, it is necessary to secondary power supply output more than 500mA electricity
Stream.Assuming that secondary power supply is Switching Power Supply, its efficiency eta 2 takes 80%, then understands that primary power source will at least providePower.
(1) if being load supplying by Power Entry Module (i.e. main power supply circuit)：
Then by formula P=UPower supply×I-UD3×I-I2×RIt is mainThe supply current I of main power supply circuit can be obtained；
Substitute into P=2.06W, UPower supply=5.6V, UD3=0.3V, RIt is mainAbout=2.5 Ω, obtains I=514mA, on main current supply circuit
The pressure drop of total current-limiting resistance is U=2.5*0.514=1.285V, because primary power source output is 5.6V, then secondary power supply is defeated
Loaded work piece below can normally be driven completely still above 4V, secondary power supply by entering voltage.
(2) if being load supplying by farad capacitor 21 (i.e. stand-by power supply circuit 2)：
Then by formula P=UFarad×I-I2×(R8+RFarad) it can obtain the supply current I of stand-by power supply circuit 2；
Substitute into UFarad=5.3V, the 3rd current-limiting resistance 22R8=2.5 Ω, RFarad=0.3 Ω, obtain I=506mA, then it is standby
The pressure drop of the upper limit leakage resistance of power supply circuit 2 is U=2.5*0.506=1.265V, it is seen then that the input voltage of secondary power supply is still big
In 4V, secondary power supply still can normally drive loaded work piece below.
In addition, the charging current or supply current in power supply circuit are not above what each component in circuit can be born
Maximum current, and suitable surplus is left, make circuit long-term work in safe and reliable current range.
A kind of heat death theory product electric power system provided by the invention, when the terminal voltage of the farad capacitor as stand-by power supply is small
When preset voltage value, now only resistance current-limiting circuit charges for farad capacitor, compared with prior art, resistance current-limiting circuit
In the first current-limiting resistance it is bigger, so charging when charging current it is smaller, the impact to preceding level power supply is smaller.When as standby
When the terminal voltage of the farad capacitor of power supply is not less than preset voltage value, PMOS current-limiting circuit and resistor current circuit in parallel are method
Electric capacity charging is drawn, and because the resistance in PMOS current limliting circuit is much smaller than resistance current-limiting circuit, therefore, resistance current-limiting circuit phase
When in being short-circuited, only PMOS current-limiting circuit charges for farad capacitor, and the second current-limiting resistance and the 3rd current-limiting resistance continue to limit
Stream；In addition, also add play buffering charging current, eliminate moment big charging current the peak electric capacity that disappears, further such that to
All produced during the entire process of farad capacitor charging without high current, reduce the impact to charge power supply.It can be seen that to farad
All produced during the entire process of electric capacity charging without high current, reduce the impact to charge power supply.Further, since main power supply electricity
The equal very little of loop internal resistance on road and stand-by power supply circuit, therefore, when to load supplying, either main power supply circuit or standby
It is load supplying with power supply circuit, further reduces the pressure drop of current-limiting resistance, improve power supplying efficiency.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
It should also be noted that, in this manual, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except other identical element in the process including the key element, method, article or equipment being also present.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (7)
- A kind of 1. heat death theory product electric power system, it is characterised in that including main power supply circuit and stand-by power supply circuit, wherein, institute Stating main power supply circuit includes power supply output module, switch control module and and the first resistor current-limiting circuit and second resistance that connect Current-limiting circuit, wherein,The power supply output module, for being described by the first resistor current-limiting circuit and the second resistance current-limiting circuit Farad capacitor in stand-by power supply circuit charges or is load supplying；The switch control module, for when the terminal voltage of the farad capacitor is less than preset voltage value, controlling described second Resistance current-limiting circuit disconnects；When the terminal voltage of the farad capacitor is not less than the preset voltage value, control second electricity Current-limiting circuit conducting is hindered, wherein, the preset voltage value is according to the target charging voltage of the farad capacitor and described second The performance of resistance current-limiting circuit is set；The stand-by power supply circuit includes the farad capacitor, for being the load supplying as stand-by power supply；Wherein, the second resistance current-limiting circuit includes PMOS current-limiting circuit and NMOS tube control circuit, wherein：The NMOS tube control circuit includes NMOS tube, and the logical of itself is controlled for the control according to the switch control module It is disconnected, and then control the break-make of the PMOS current-limiting circuit；The switch control module is specially metal-oxide-semiconductor switch control module, for the big of the terminal voltage according to the farad capacitor It is small to control the break-make of the NMOS tube control circuit；The metal-oxide-semiconductor switch control module specifically includes the first divider resistance, the second divider resistance, clamp diode, protection electricity Resistance and filter capacitor, wherein,The first end of first divider resistance is connected with the first end of the protective resistance, and is switched as the metal-oxide-semiconductor The input of control module, the second end of first divider resistance connects with the first end of second divider resistance, described The second end ground connection of second divider resistance, the second end of the protective resistance is connected with the opposite ends of the clamp diode, described The anode of clamp diode is connected with the first end of the filter capacitor, the second end ground connection of the filter capacitor, the clamper The anode of diode is connected with the second end of first divider resistance, described in the second end conduct of first divider resistance The output end of metal-oxide-semiconductor switch control module, it is connected with the grid of the NMOS tube in the NMOS tube control circuit.
- 2. heat death theory product electric power system as claimed in claim 1, it is characterised in that the first resistor current-limiting circuit includes First current-limiting resistance, the PMOS current-limiting circuit include PMOS and the second current-limiting resistance, wherein, first current-limiting resistance First end be connected with the source electrode of the PMOS, and the output end with the power supply output module is connected, the PMOS Drain electrode be connected respectively with the first end of second current-limiting resistance and the first end for the peak electric capacity that disappears, first current-limiting resistance The second end be connected with the second end of second current-limiting resistance and connected by the first end of diode and the farad capacitor Connect, the second end ground connection of the farad capacitor, the second end ground connection of the peak electric capacity that disappears, the grid of the PMOS passes through resistance Drain electrode with the NMOS tube is connected.
- 3. heat death theory product electric power system as claimed in claim 2, it is characterised in that the stand-by power supply circuit also includes the Three current-limiting resistances, wherein, the first end of the 3rd current-limiting resistance is connected with the input of the metal-oxide-semiconductor switch control module, Second end of the 3rd current-limiting resistance is connected with the first end of the farad capacitor, the second end ground connection of the farad capacitor.
- 4. the heat death theory product electric power system as described in claim any one of 1-3, it is characterised in that the power supply output module Input voltage be 9-24V, output voltage 5.6V.
- 5. heat death theory product electric power system as claimed in claim 4, it is characterised in that the target charging electricity of the farad capacitor Press as 5.3V.
- 6. heat death theory product electric power system as claimed in claim 5, it is characterised in that the resistance model of first current-limiting resistance It is 2 Ω -2.5 Ω to enclose for the Standard resistance range more than 50 Ω, second current-limiting resistance.
- 7. heat death theory product electric power system as claimed in claim 6, it is characterised in that the resistance model of the 3rd current-limiting resistance Enclose for 2 Ω -2.5 Ω.
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| CN201510330063.8A CN104967209B (en) | 2015-06-15 | 2015-06-15 | A kind of heat death theory product electric power system |
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| DE3812770A1 (en) * | 1988-04-16 | 1989-10-26 | Bosch Gmbh Robert | Circuit for increasing current in accumulator-power apparatuses |
| CN101425674A (en) * | 2008-11-14 | 2009-05-06 | 张军才 | Overvoltage protection circuit for quasi-resonance electromagnetic water heater |
| CN101908771A (en) * | 2009-06-08 | 2010-12-08 | 欣旺达电子股份有限公司 | Circuit for realizing fast and slow charging in linear circuits and charging control method |
| JP6169892B2 (en) * | 2013-05-21 | 2017-07-26 | ルネサスエレクトロニクス株式会社 | Semiconductor integrated circuit and operation method thereof |
| CN104467169B (en) * | 2014-12-26 | 2016-10-05 | 深圳警翼数码科技有限公司 | A kind of uninterrupted power supply device |
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