CN102694414B - Gapless automatic switching device for intelligent dual direct-current power supply - Google Patents
Gapless automatic switching device for intelligent dual direct-current power supply Download PDFInfo
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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
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- 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
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Abstract
The invention belongs to the field of automation and control engineering, and in particular relates to a gapless automatic switching device for an intelligent dual direct-current power supply with a power supply state monitoring function. The gapless automatic switching device consists of a resistor, a light emitting diode, a diode, a voltage stabilizing tube, a voltage comparator, a field effect tube, a high-precision high-current power switch, a reverser, a microcontroller and a controller area network (CAN) transceiver. By using the gapless automatic switching device, a power supply is switched without a gap, so that a direct current is provided uninterruptedly. A control part adopts an enhanced metal-oxide-semiconductor field-effect transistor (MOSEFT) as a voltage for driving, so that power consumption of an original system is not increased basically when the gapless automatic switching device works. After a switching action is finished, an auxiliary power supply supplies power to equipment through the high-precision high-current power switch, so that the energy loss is extremely low. The aim of remotely monitoring the working state of the power supply can be fulfilled by programming the microcontroller and by the transmission function of the CAN transceiver. Therefore, the invention has the advantages that the gapless automatic switching device is high in efficiency, simple and reliable in circuit, low in cost and energy consumption, high in adaptability, and favorable to remote monitoring.
Description
Technical field
The invention belongs to automation control engineering field, be specifically related to the seamless automatic switching control equipment of a kind of two dc power supply with power supply state monitoring function.
Background technology
Along with the development of science and technology and the application of high-end precision apparatus, requirements at the higher level are proposed to the quality of power supply and power supply reliability, for hospital, market, bank, chemical industry, skyscraper, military installations, the important events such as fire-fighting all require to be equipped with the reliability that two-way power supply ensures power supply, especially in above special occasions, relate to again the equipment in automation control engineering field, just more need to be equipped with two-way even multiple power supplies, and the device of reliable conversion can be carried out between two-way power supply, ensure that power supply is uninterrupted, to meet the normal operation of equipment, ensure the continuity of the monitor and forecast work to operational outfit simultaneously.Common are some electronic instruments to need to carry out not power down protection to the data in random access memory ram, is exactly the not power down protection that clock circuit continues recording time information in another kind of situation.At present, the switching of stand-by power supply is generally taked with under type: 1. standby mode: after switch unit detects power failure, is switched to stand-by power supply.This stand-by power supply also exists following problem: (1) switches needs the regular hour, likely causes equipment to restart; (2) stand-by power supply majority adopts battery powered mode, needs periodic detection and changes battery, and cost is higher simultaneously; 2. online: stand-by power supply all the time with equipment connection, but its output voltage is a little less than externally fed power supply, therefore when external power source is normal, stand-by power supply can not to equipment output power, and when there is power failure or externally fed undertension, stand-by power supply will be powered to equipment.Which is in state to be powered because of stand-by power supply always, there is electric energy loss comparatively large, is unfavorable for the problem of energy savings.Above two kinds of power supply switching modes all can not ensure the seamless switching of power supply completely.
Through finding the literature search of prior art, China Patent Publication No. CN201750208U, publication date is 2011.02.16, patent name is: the embedded device double supply automatic switch-over circuit of band standby battery, this patent readme is: " this circuit is provided with two cover power supplies, be made up of AC/DC civil power 220V modular converter and standby battery, the power supply state of civil power and the electricity of storage battery is detected in real time by the microprocessor of embedded device, mains-supplied state detection signal is connected with the port of MCU respectively with the electric power detection signal of standby battery, realize realizing filling of electrical source exchange and standby battery to the control of relay coil break-make by MCU, electric discharge management ".Its weak point is: this circuit double loop power supply wherein road is storage battery power supply, there is useful life, long-time power supply capacity is not enough and manage loaded down with trivial details problem to storage battery charge and discharge, the function of two-way Power supply situation being carried out to Real-Time Monitoring cannot be realized, owing to there being the existence of relay, the object of two-way power supply seamless switching cannot be reached completely.
Summary of the invention
The object of the present invention is to provide the dual power supply automatic switching device that a kind of automatic seamless realizing remote power feeding status monitoring switches.
The object of the present invention is achieved like this:
The present invention is made up of resistance, light-emitting diode, diode, voltage-stabiliser tube, voltage comparator, field effect transistor, high-accuracy heavy-current power switch, reverser, microcontroller, CAN transceiver, it is characterized in that:
4 tie points drawn by main power source (V1), and main power source the 1st tie point is connected with+Vbb the port of the first current power switch (U5);
Main power source the 2nd tie point is connected with one end of the first resistance (R1), and the other end of the first resistance (R1) is connected with one end of the first light-emitting diode (D1), the other end ground connection of the first light-emitting diode (D1);
Main power source the 3rd tie point is connected with the anode of the first diode (D2);
Main power source the 4th tie point is connected with the anode of the second diode (D3), the negative electrode of the second diode (D3) is connected with one end of the 5th resistance (R5), the other end of the 5th resistance (R5) is connected with one end of the tenth resistance (R10), the other end ground connection of the tenth resistance (R10), wherein between the 5th resistance (R5), the tenth resistance (R10), draw tie point, be connected with the 2nd pin of the second voltage comparator (U2) with the 3rd pin of the first voltage comparator (U1);
The negative electrode of the first diode (D2) draws 5 tie points, first diode the 1st tie point is connected with one end of the 4th resistance (R4), the other end of the 4th resistance (R4) is connected with the first voltage-stabiliser tube (D4) anode, first voltage-stabiliser tube (D4) minus earth, between the 4th resistance (R4) and the first voltage-stabiliser tube (D4), draw tie point, be connected with the 3rd pin of the second voltage comparator (U2);
First diode the 2nd tie point is connected with one end of the 6th resistance (R6), the other end of the 6th resistance (R6) is connected with the positive pole of the second voltage-stabiliser tube (D5), the minus earth of the second voltage-stabiliser tube (D5), between the 6th resistance (R6) and the second voltage-stabiliser tube (D5), draw tie point, be connected with the 2nd pin of the first voltage comparator (U1);
1st pin of the first diode the 3rd tie point and the first voltage comparator (U1), the 1st pin of the second voltage comparator (U2), 1st pin of tertiary voltage comparator (U3), the 1st pin of the 4th voltage comparator (U4) are connected, the 4th pin of the 4th pin of the first voltage comparator (U1), the 4th pin of the second voltage comparator (U2), tertiary voltage comparator (U3), the 4th pin ground connection of the 4th voltage comparator (U4);
First diode the 4th tie point is connected with one end of the second resistance (R2), the other end of the second resistance (R2) is connected with the anode of the 3rd voltage-stabiliser tube (D6), the minus earth of the 3rd voltage-stabiliser tube (D6), tie point is drawn between the second resistance (R2) and the 3rd voltage-stabiliser tube (D6), with the 5th pin of the first voltage comparator (U1), 5th pin of the second voltage comparator (U2), the grid G of the first field effect transistor (Q1), the grid G of the second field effect transistor (Q2), one end of 9th resistance (R9), the anode of the 4th voltage-stabiliser tube (D7), the input of the first reverser (U7) connects, the other end of the 9th resistance (R9), the minus earth of the 4th voltage-stabiliser tube (D7),
First diode the 5th tie point is connected with one end of the 3rd resistance (R3), and the other end of the 3rd resistance (R3) is connected with the drain D of the second field effect transistor (Q2);
The source S ground connection of field effect transistor Q1, drain D is held with the IN of the first high-accuracy heavy-current power switch (U5) and is connected;
The source S ground connection of field effect transistor Q2, drain D is connected with the grid G of the 3rd field effect transistor (Q3), one end of the 7th resistance (R7), the anode of the 5th voltage-stabiliser tube (D8) respectively, the other end of the 7th resistance (R7), the minus earth of the 5th voltage-stabiliser tube (D8).
The source S ground connection of the 3rd field effect transistor (Q3), drain D is held with the IN of the second high-accuracy heavy-current power switch (U6) and is connected.
Auxiliary power supply (V2) draws 4 tie points, and auxiliary power supply the 1st tie point is connected with+Vbb the port of the second high-accuracy heavy-current power switch (U6);
Auxiliary power supply the 2nd leading point is connected with one end of the 11 resistance (R11), and the other end of the 11 resistance (R11) is connected with one end of the second light-emitting diode (D10), the other end ground connection of the second light-emitting diode (D10);
Auxiliary power supply the 3rd leading point is connected with the anode of the 3rd diode (D11);
Auxiliary power supply the 4th leading point is connected with the anode of the 4th diode (D12), the negative electrode of the 4th diode (D12) is connected with one end of the 15 resistance (R15), the other end of the 15 resistance (R15) is connected with one end of the 16 resistance (R16), the other end ground connection of the 16 resistance (R16), wherein between the 15 resistance (R15), the 16 resistance (R16), draw tie point, be connected with the 2nd pin of the 4th voltage comparator (U4) with the 3rd pin of tertiary voltage comparator (U3);
The negative electrode of the 3rd diode (D11) draws 4 tie points, 3rd diode the 1st tie point is connected with one end of the 12 resistance (R12), the other end of the 12 resistance (R12) is connected with the anode of the 6th voltage-stabiliser tube (D13), the minus earth of the 6th voltage-stabiliser tube (D13), draw tie point in the 12 resistance (R12) and the 6th voltage-stabiliser tube (D13) junction, be connected with the 3rd pin of the 5th voltage comparator (U5);
3rd diode the 2nd leading point is connected with one end of the 13 resistance (R13), the other end of the 13 resistance (R13) is connected with the positive pole of the 7th voltage-stabiliser tube (D14), the minus earth of the 7th voltage-stabiliser tube (D14), draw tie point in the 13 resistance (R13) and the 7th voltage-stabiliser tube (D14) junction, be connected with the 2nd pin of tertiary voltage comparator (U13);
3rd diode the 3rd leading point is connected with the 1st pin of tertiary voltage comparator (U3), the 1st pin of the 4th voltage comparator (U4);
3rd diode the 4th leading point is connected with one end of the 14 resistance (R14), the other end of the 14 resistance (R14) is connected with the anode of the 8th voltage-stabiliser tube (D15), the minus earth of the 8th voltage-stabiliser tube (D15), tie point is drawn between the 14 resistance (R14) and the 8th voltage-stabiliser tube (D15), with the 5th pin of tertiary voltage comparator (U3), 5th pin of the 4th voltage comparator (U4), one end of 17 resistance (R17), one end of 18 resistance (R18) connects, the other end ground connection of the 17 resistance (R17), the other end of the 18 resistance (R18) respectively with the anode of the 9th voltage-stabiliser tube (D16), the input of the second reverser (U8) connects, the minus earth of the 9th voltage-stabiliser tube (D16),
The anode that OUT holds one end of connection the 8th resistance (R8), the other end of the 8th resistance (R8) connects the 3rd light-emitting diode (D9) of the first high-accuracy heavy-current power switch (U5), the minus earth of the 3rd light-emitting diode (D9), the IS of the first high-accuracy heavy-current power switch (U5) holds one end of connection the 20 resistance (R20), the other end ground connection of the 20 resistance (R20);
The anode that OUT holds one end of connection the 19 resistance (R19), the other end of the 19 resistance (R19) connects the 4th light-emitting diode (D17) of the second high-accuracy heavy-current power switch (U6), the minus earth of the 4th light-emitting diode (D17), the IS of the second high-accuracy heavy-current power switch (U6) holds one end of connection the 24 resistance (R24), the other end ground connection of the 24 resistance (R24).
The output of the first reverser (U7) is connected with the PA1 pin of microcontroller (U9), the output of the second reverser (U8) is connected with the PA0 pin of microcontroller (U9), and the PM0/RXCAN3 pin of microcontroller (U8) is connected with the CRXD pin of CAN transceiver (U9), the PM0/TXCAN3 pin of microcontroller (U8) is connected with the CTXD pin of CAN transceiver (U9) and finally transmits signals to remote equipment by CAN transceiver U9 and show.
Main power source (V1) is powered in normal situation, by the first voltage comparator (U1), the second voltage comparator (U2), the first field effect transistor (Q1), ensure that the first high-accuracy heavy-current power switch (U5) is in conducting state, first high-accuracy heavy-current power switch (U5) exports as main power source V1 direct current, is indicated by the 3rd light-emitting diode (D9) simultaneously.
Main power source (V1) is powered in normal situation, by tertiary voltage comparator (U3), the 4th voltage comparator (U4), the second field effect transistor (Q2), the 3rd field effect transistor (Q3), ensure that the second high-accuracy heavy-current power switch (U6) is in cut-off state, auxiliary power supply V2 does not provide direct current, simultaneously by luminous 4th diode (D17) instruction.
5th pin of the first voltage comparator (U1) is connected with the 5th pin of the second voltage comparator (U2), is that the grid G of the first field effect transistor (Q1) provides cut-in voltage, is the direct current that the first reverser (U7) provides fixed voltage simultaneously; 5th pin of described tertiary voltage comparator (U3) is connected with the 5th pin of the 4th voltage comparator (U4), is the direct current that the second reverser (U8) provides fixed voltage.
First field effect transistor (Q1) controls the break-make of the first high-accuracy heavy-current power switch (U5); Described 3rd field effect transistor (Q3) controls the break-make of the second high-accuracy heavy-current power switch (U6).
The supply power voltage interval of main power source is that { 20V, 28V}, the supply power voltage interval of auxiliary power supply is { 20V, 28V}.
Voltage comparator is window voltage comparator.
The model that microcontroller (U9) adopts is: AT90CAN series, P8XC592,82C200,82526,82527, MC9S08 series, MC9S12 be serial or 72005.
The model that CAN transceiver (U10) adopts is: ISO1050, PCA82C251, CTM1050, ADM3054 or MAX13041.
Beneficial effect of the present invention is:
Electrical source exchange gapless of the present invention, ensures uninterruptedly to provide direct current continuously.Control section adopts enhancement mode MOSFET to be voltage driven, does not substantially increase original system power consumption during work.After switching action, auxiliary power supply is powered to equipment by high-accuracy heavy-current power switch, and energy loss is minimum.After main power source exceeds working range, auxiliary power supply V2 is fast automatic completes Power convert work, and power work state, by writing microcontroller implementation procedure, by CAN transceiver transfer function, realizes the object of remote monitoring.Adopt device to be switching controls device, without particular/special requirements such as high-power, high pressure, therefore the present invention has that efficiency is high, circuit is simple and reliable, cost is low, energy consumption is low, strong adaptability, is beneficial to the advantage of remote monitoring.
Accompanying drawing explanation
Fig. 1 is the seamless automatic switching control equipment circuit diagram of the present invention's intelligence two dc power supply.
Embodiment
For a more detailed description to the present invention below in conjunction with example:
As shown in figure: when main power source is powered, by the break-make of Q1 control U5, realize main power source V1 and power, meanwhile, by the break-make of Q1 control Q2, then by the break-make of Q2 control Q3, by the break-make of Q3 control U6, when guaranteeing that main power source V1 powers, auxiliary power supply V2 is in off-position.The voltage range of main power source V1 is realized controlling by U1, and when main power source V1 voltage exceeds given voltage scope, main power source V1 is converted into auxiliary power supply V2 powering mode while powering and cutting off.When main and auxiliary power supply is powered separately, main and auxiliary Power supply is indicated respectively by D9, D17 light-emitting diode, the information that main and auxiliary power supply is powered respectively simultaneously transfers to U9 microcontroller through reverser U7 and U8 by State1 and State2, then transfers to monitoring position by CAN transceiver U10.
The present invention is specially further:
1. main power source V1 provides direct current.Main power source V1 powers and is specifically realized by U1, U2 voltage comparator, employing be the form of window voltage comparator, upper voltage limit is obtained by R4 and D4, and lower voltage limit is obtained by R6 and D5, and input terminal voltage is obtained by R5, R10.When main power source V1 is in working range, U1, U2 output is high level, and after exceeding working range voltage, U1, U2 output is low level.
2. the break-make of field effect transistor Q1 is controlled by voltage comparator U1, U2.When main power source V1 is within the scope of normal working voltage, the output of voltage comparator U1, U2 is connected with the grid G of field effect transistor Q1, output is high level, ensure that field effect transistor Q1 is in conducting state, after main power source V1 operating voltage exceeds prescribed limit, voltage comparator U1, U2 output low level, control Q1 is in off-state.
3. the break-make of field effect transistor Q2 is controlled by voltage comparator U1, U2.When main power source V1 is within the scope of normal working voltage, the output of voltage comparator U1, U2 is connected with the grid G of field effect transistor Q2, output is high level, ensure that field effect transistor Q2 is in conducting state, after main power source V1 operating voltage exceeds prescribed limit, voltage comparator U1, U2 output low level, control Q2 is in off-state.
4. the break-make of field effect transistor Q3 is controlled by field effect transistor Q2.The drain D of Q2 is connected with the grid G of Q3, when main power source V1 is in running order, and Q2 conducting, thus the drain D of Q2 is in low level state, namely the grid G of Q3 is in low level state, and Q3 is in off-state, and the drain D of Q3 is in high potential state.Otherwise Q3 is in conducting state when Q2 is in off-state.
5. the break-make of high-accuracy heavy-current power switch U5 is controlled by effect pipe Q1.When main power source V1 is operated in prescribed limit, Q1 keeps on-state, the drain D ground connection of Q1, thus makes the IN of high-accuracy heavy-current power switch U5 hold ground connection, ensures that high-accuracy heavy-current power switch U5 is in conducting state, realizes main power source V1 and power.
6. the break-make of high-accuracy heavy-current power switch U6 is controlled by effect pipe Q3.When main power source V1 is operated in prescribed limit, Q2 keeps on-state, the drain D of Q2 is low level, the grid G that low level delivers to Q3 ensures that Q2 is in off-state, the drain D of Q2 keeps high level, thus make the IN end of high-accuracy heavy-current power switch U6 keep high level, ensure that high-accuracy heavy-current power switch U6 is in off-state, when guaranteeing that main power source V1 powers, auxiliary power supply V2 does not power.
7. auxiliary power supply V2 provides direct current.Auxiliary power supply V2 powers and is specifically realized by U3, U4 voltage comparator, principle and working method identical with U1, U2.
Switch unit of the present invention is when main power source V1 exceeds working range, and gapless is switched to auxiliary power supply V2 by supply line.
Circuit connecting relation of the present invention is as shown in Figure 1:
5 of voltage comparator U1,5 two of U2 output pins are connected, for field effect transistor Q1 grid G provides cut-in voltage, simultaneously for State1 provides the direct current of fixed voltage.
The source S ground connection of field effect transistor Q1, grid G exports with voltage comparator U1, U2 and is connected, and drain D is connected with the IN of high-accuracy heavy-current power switch U5, controls the break-make of high-accuracy heavy-current power switch U5.
The source S ground connection of field effect transistor Q3, grid G is by being connected with the drain D of Q2, and drain D is connected with the IN of high-accuracy heavy-current power switch U6, controls the break-make of high-accuracy heavy-current power switch U6.
5 of voltage comparator U3,5 two of U4 output pins are connected, for State2 provides the direct current of fixed voltage.
State1 with State2 is connected with PA1, PA0 two pins of microcontroller U9 after reverser U7, U8, drawn by PM0/RXCAN3, PM0/TXCAN3 two pins of microcontroller U9 and be connected with CRXD with CTXD of CAN transceiver U10 respectively, finally transmit signals to remote equipment by CAN transceiver U9 and show.
Operation principle of the present invention is as follows:
Under main power source V1 powers normal situation, voltage comparator U1, U2 output is high level, this high level signal is divided into three tunnels, field effect transistor Q1 grid G place is delivered on one road, field effect transistor Q1 is made to be in conducting state as cut-in voltage, field effect transistor Q1 drain D ground connection, drain D is connected with the IN interface of high-accuracy heavy-current power switch U5, this high-accuracy heavy-current power switch is in conducting state when IN holds during ground connection, high-accuracy heavy-current power switch U5 opens, load circuit is in main power source V1 power supply state, is indicated by light-emitting diode D9; Field effect transistor Q2 grid G place is delivered on another road, field effect transistor Q2 is made to be in conducting state as cut-in voltage, field effect transistor Q2 drain D ground connection, drain D is connected with field effect transistor Q3 grid G, low level ensures that field effect transistor Q3 is in off-state, and ensure that field effect transistor Q3 drain D is high level, this high level signal is connected to the IN interface of high-accuracy heavy-current power switch U6, make high-accuracy heavy-current power switch U6 be in cut-off state, ensure that auxiliary power supply V2 does not provide direct current.The direct current of burning voltage is drawn on 3rd tunnel after voltage-stabiliser tube D7 voltage stabilizing by State1, can carry out main power source V1 condition judgement according to this.Auxiliary power supply V2, for the direct current providing fixed voltage for State2 through voltage comparator U3, U4, can carry out auxiliary power supply V2 condition judgement according to this.
Under main power source V1 powers abnormal situation, U1, U2, U3, U4 electric power connection line can ensure voltage comparator U1, the power supply of U2 is provided by auxiliary power supply V2, guarantee voltage comparator U1, U2 is in running order, output is low level, this low level signal is sent to two-way circuit, field effect transistor Q1 grid G place is delivered on one road, field effect transistor Q1 is made to be in off-state, field effect transistor Q1 drain D is pulled to high level, field effect transistor Q1 drain D is connected with the IN interface of high-accuracy heavy-current power switch U5, this high-accuracy heavy-current power switch is in cut-off state when IN end is earth-free, high-accuracy heavy-current power switch U5 closes, main power source V1 stops powering to load circuit, field effect transistor Q2 grid G place is delivered on another road, field effect transistor Q2 is made to be in cut-off state, field effect transistor Q2 drain D is high level, field effect transistor Q2 drain D is connected with field effect transistor Q3 grid G, high level ensures that field effect transistor Q3 is in conducting state, make field effect transistor Q3 drain D ground connection, drain D is connected with the IN interface of high-accuracy heavy-current power switch U6, this high-accuracy heavy-current power switch is in conducting state when IN holds during ground connection, high-accuracy heavy-current power switch U6 opens, load circuit is in auxiliary power supply V2 power supply state, is indicated by light-emitting diode D17.And then ensure that direct current is supplied to power consumption equipment incessantly.
1st pin ground connection after resistance of high-accuracy heavy-current power switch U5, U6, the 1st pin electric current direct proportion, in load circuit current, can play current protection effect to load circuit.
In main and auxiliary power circuit, D1, D10 are power supply indication light diode, and D9, D17 are load supplying indication light diode.
State1 with State2 is connected with PA1, PA0 two pins of microcontroller U9 after reverser U7, U8 process, after microcontroller U9 process, information is transmitted signals to remote equipment display by CAN transceiver U10.
Workflow of the present invention is:
The two-way DC power supply of this system is respectively V1, V2, and the normal power supply voltage of V1, V2 is 24V, but actual power voltage exists certain fluctuation, this fluctuation of this systems axiol-ogy, automatically completes the reporting functions of electrical source exchange and abnormal electrical power supply information simultaneously.
Resistance R4 and voltage-stabiliser tube D4 for determining the permission fluctuation voltage lower limit of main power source V1, as 20V; Resistance R6 and voltage-stabiliser tube D5 for determining the permission fluctuation voltage upper limit of main power source V1, as 28V.Amplifier U1, U2 form bipolar limit comparator.
1. when V1 supply power voltage is in interval, { when 20V, 28V}, the output State1 of bipolar limit comparator is high level, and this signal can control field effect transistor Q1 conducting, i.e. the grounded drain of Q1, device U5 conducting.Output State1 is that high level controls field effect transistor Q2 conducting simultaneously, the grounded drain of Q2, then the gate pole of Q3 is low-voltage, and Q3 ends, and device U6 ends.Now main power source V1 powers normally, and is power supply.
2. when V1 supply power voltage is not in interval, { when 20V, 28V}, the output State1 of bipolar limit comparator is low level, and this signal can control field effect transistor Q1 cut-off, device U5 ends.Output State1 is that low level controls field effect transistor Q2 cut-off simultaneously, and be then high voltage by the gate pole of the dividing potential drop effect Q3 of resistance R3, resistance R7, Q3 conducting, device U6 ends.Now main power source V1 abnormal electrical power supply, adopts auxiliary power supply V2 to power.
Resistance R12 and voltage-stabiliser tube D13 for determining the permission fluctuation voltage lower limit of auxiliary power supply V2, as 20V; Resistance R13 and voltage-stabiliser tube D14 for determining the permission fluctuation voltage upper limit of auxiliary power supply V2, as 28V.Amplifier U3, U4 form bipolar limit comparator, when V2 supply power voltage is in interval { when 20V, 28V}, the output State2 of bipolar limit comparator is high level, when V2 supply power voltage is not in interval, { when 20V, 28V}, the output State2 of bipolar limit comparator is low level.
Power supply state information State1, the State2 of main power source and auxiliary power supply oppositely after, reported by the microcontroller U9 and CAN transceiver U10 being integrated with CAN module, complete the measuring ability of main and auxiliary Power supply state.
The model of the employing of microcontroller U9 of the present invention is: AT90CAN series, P8XC592,82C200,82526,82527, MC9S08 series, MC9S12 is serial, 72005.
The model that CAN transceiver U10 adopts is: ISO1050, PCA82C251, CTM1050, ADM3054, MAX13041.
Claims (7)
1. the seamless automatic switching control equipment of intelligent two dc power supply, is made up of resistance, light-emitting diode, diode, voltage-stabiliser tube, voltage comparator, field effect transistor, current power switch, reverser, microcontroller, CAN transceiver, it is characterized in that:
4 tie points drawn by main power source (V1), and main power source the 1st tie point is connected with+Vbb the port of the first current power switch (U5);
Main power source the 2nd tie point is connected with one end of the first resistance (R1), and the other end of the first resistance (R1) is connected with one end of the first light-emitting diode (D1), the other end ground connection of the first light-emitting diode (D1);
Main power source the 3rd tie point is connected with the anode of the first diode (D2);
Main power source the 4th tie point is connected with the anode of the second diode (D3), the negative electrode of the second diode (D3) is connected with one end of the 5th resistance (R5), the other end of the 5th resistance (R5) is connected with one end of the tenth resistance (R10), the other end ground connection of the tenth resistance (R10), wherein between the 5th resistance (R5), the tenth resistance (R10), draw tie point, be connected with the in-phase input end of the second voltage comparator (U2) with the inverting input of the first voltage comparator (U1);
The negative electrode of the first diode (D2) draws 5 tie points, first diode the 1st tie point is connected with one end of the 4th resistance (R4), the other end of the 4th resistance (R4) is connected with the first voltage-stabiliser tube (D4) negative electrode, first voltage-stabiliser tube (D4) plus earth, between the 4th resistance (R4) and the first voltage-stabiliser tube (D4), draw tie point, be connected with the inverting input of the second voltage comparator (U2);
First diode the 2nd tie point is connected with one end of the 6th resistance (R6), the other end of the 6th resistance (R6) is connected with the negative electrode of the second voltage-stabiliser tube (D5), the plus earth of the second voltage-stabiliser tube (D5), between the 6th resistance (R6) and the second voltage-stabiliser tube (D5), draw tie point, be connected with the in-phase input end of the first voltage comparator (U1);
The power pin positive pole of the first diode the 3rd tie point and the first voltage comparator (U1), the power pin positive pole of the second voltage comparator (U2), the power pin positive pole of tertiary voltage comparator (U3), the power pin positive pole of the 4th voltage comparator (U4) are connected, the power pin negative pole of the power pin negative pole of the first voltage comparator (U1), the power pin negative pole of the second voltage comparator (U2), tertiary voltage comparator (U3), the power pin minus earth of the 4th voltage comparator (U4);
First diode the 4th tie point is connected with one end of the second resistance (R2), the other end of the second resistance (R2) is connected with the negative electrode of the 3rd voltage-stabiliser tube (D6), the plus earth of the 3rd voltage-stabiliser tube (D6), tie point is drawn between the second resistance (R2) and the 3rd voltage-stabiliser tube (D6), with the output of the first voltage comparator (U1), the output of the second voltage comparator (U2), the grid G of the first field effect transistor (Q1), the grid G of the second field effect transistor (Q2), one end of 9th resistance (R9), the negative electrode of the 4th voltage-stabiliser tube (D7), the input of the first reverser (U7) connects, the other end of the 9th resistance (R9), the plus earth of the 4th voltage-stabiliser tube (D7),
First diode the 5th tie point is connected with one end of the 3rd resistance (R3), and the other end of the 3rd resistance (R3) is connected with the drain D of the second field effect transistor (Q2);
The source S ground connection of field effect transistor (Q1), drain D is held with the IN of the first current power switch (U5) and is connected;
The source S ground connection of field effect transistor (Q2), drain D is connected with the grid G of the 3rd field effect transistor (Q3), one end of the 7th resistance (R7), the negative electrode of the 5th voltage-stabiliser tube (D8) respectively, the other end of the 7th resistance (R7), the plus earth of the 5th voltage-stabiliser tube (D8);
The source S ground connection of the 3rd field effect transistor (Q3), drain D is held with the IN of the second current power switch (U6) and is connected;
Auxiliary power supply (V2) draws 4 tie points, and auxiliary power supply the 1st tie point is connected with+Vbb the port of the second current power switch (U6);
Auxiliary power supply the 2nd leading point is connected with one end of the 11 resistance (R11), the other end of the 11 resistance (R11) is connected with one end of the second light-emitting diode (D10), the other end ground connection of the second light-emitting diode (D10);
Auxiliary power supply the 3rd leading point is connected with the anode of the 3rd diode (D11);
Auxiliary power supply the 4th leading point is connected with the anode of the 4th diode (D12), the negative electrode of the 4th diode (D12) is connected with one end of the 15 resistance (R15), the other end of the 15 resistance (R15) is connected with one end of the 16 resistance (R16), the other end ground connection of the 16 resistance (R16), wherein between the 15 resistance (R15), the 16 resistance (R16), draw tie point, be connected with the in-phase input end of the 4th voltage comparator (U4) with the inverting input of tertiary voltage comparator (U3);
The negative electrode of the 3rd diode (D11) draws 4 tie points, 3rd diode the 1st tie point is connected with one end of the 12 resistance (R12), the other end of the 12 resistance (R12) is connected with the negative electrode of the 6th voltage-stabiliser tube (D13), the plus earth of the 6th voltage-stabiliser tube (D13), draw tie point in the 12 resistance (R12) and the 6th voltage-stabiliser tube (D13) junction, be connected with the inverting input of the 5th voltage comparator (U5);
3rd diode the 2nd tie point is connected with one end of the 13 resistance (R13), the other end of the 13 resistance (R13) is connected with the positive pole of the 7th voltage-stabiliser tube (D14), the minus earth of the 7th voltage-stabiliser tube (D14), draw tie point in the 13 resistance (R13) and the 7th voltage-stabiliser tube (D14) junction, be connected with the in-phase input end of tertiary voltage comparator (U13);
3rd diode the 3rd tie point is connected with the power pin positive pole of tertiary voltage comparator (U3) power pin positive pole, the 4th voltage comparator (U4);
3rd diode the 4th tie point is connected with one end of the 14 resistance (R14), the other end of the 14 resistance (R14) is connected with the negative electrode of the 8th voltage-stabiliser tube (D15), the plus earth of the 8th voltage-stabiliser tube (D15), tie point is drawn between the 14 resistance (R14) and the 8th voltage-stabiliser tube (D15), with the output of tertiary voltage comparator (U3), the output of the 4th voltage comparator (U4), one end of 17 resistance (R17), one end of 18 resistance (R18) connects, the other end ground connection of the 17 resistance (R17), the other end of the 18 resistance (R18) respectively with the negative electrode of the 9th voltage-stabiliser tube (D16), the input of the second reverser (U8) connects, the plus earth of the 9th voltage-stabiliser tube (D16),
The anode that OUT holds one end of connection the 8th resistance (R8), the other end of the 8th resistance (R8) connects the 3rd light-emitting diode (D9) of the first current power switch (U5), the minus earth of the 3rd light-emitting diode (D9), the diagnostic feedback end of the first current power switch (U5) connects one end of the 20 resistance (R20), the other end ground connection of the 20 resistance (R20);
The anode that OUT holds one end of connection the 19 resistance (R19), the other end of the 19 resistance (R19) connects the 4th light-emitting diode (D17) of the second current power switch (U6), the minus earth of the 4th light-emitting diode (D17), the diagnostic feedback end of the second current power switch (U6) connects one end of the 24 resistance (R24), the other end ground connection of the 24 resistance (R24).
2. the seamless automatic switching control equipment of the intelligent two dc power supply of one according to claim 1, it is characterized in that: described main power source (V1) is powered in normal situation, by the first voltage comparator (U1), the second voltage comparator (U2), the first field effect transistor (Q1), ensure that the first current power switch (U5) is in conducting state, first current power switch (U5) exports as main power source direct current, is indicated by the 3rd light-emitting diode (D9) simultaneously.
3. the seamless automatic switching control equipment of the intelligent two dc power supply of one according to claim 2, it is characterized in that: described main power source (V1) is powered in normal situation, by tertiary voltage comparator (U3), the 4th voltage comparator (U4), the second field effect transistor (Q2), the 3rd field effect transistor (Q3), ensure that the second current power switch (U6) is in cut-off state, auxiliary power supply (V2) do not provide direct current, simultaneously by the 4th light-emitting diode (D17) instruction.
4. the seamless automatic switching control equipment of the intelligent two dc power supply of one according to claim 3, it is characterized in that: the output of described first voltage comparator (U1) is connected with the output of the second voltage comparator (U2), be that the grid G of the first field effect transistor (Q1) provides cut-in voltage, be the direct current that the first reverser (U7) provides fixed voltage simultaneously; The output of described tertiary voltage comparator (U3) is connected with the output of the 4th voltage comparator (U4), and be the direct current that the second reverser (U8) provides fixed voltage, described voltage comparator is amplifier.
5. the seamless automatic switching control equipment of the intelligent two dc power supply of one according to claim 4, is characterized in that: described first field effect transistor (Q1) controls the break-make of the first current power switch (U5); Described 3rd field effect transistor (Q3) controls the break-make of the second current power switch (U6).
6. the seamless automatic switching control equipment of the intelligent two dc power supply of one according to claim 5, it is characterized in that: the supply power voltage interval of described main power source is (20V, 28V), the supply power voltage interval of described auxiliary power supply (V2) is (20V, 28V).
7. the seamless automatic switching control equipment of the intelligent two dc power supply of one according to claim 6, is characterized in that: described voltage comparator is window voltage comparator.
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| CN103347232B (en) * | 2013-07-25 | 2017-02-08 | 青岛歌尔声学科技有限公司 | Dual-mode earphone circuit and audio output method |
| CN105743210B (en) * | 2014-12-09 | 2018-08-07 | 广州巨浪船舶技术工程有限公司 | The intelligent detection equipment of two-way direct current power supply is seamless automatic switching control equipment |
| CN104659902B (en) * | 2015-02-05 | 2016-12-07 | 江苏科技大学 | The uninterrupted power supply of signal detection alarm system for ship controls device and implementation method |
| CN106602701A (en) * | 2016-11-16 | 2017-04-26 | 北京圣福伦科技有限公司 | Financial equipment uninterruptible power supply circuit and power supply method |
| CN109616043B (en) * | 2019-02-15 | 2022-04-19 | 京东方科技集团股份有限公司 | Voltage control circuit, control method thereof and display device |
| CN110071571A (en) * | 2019-04-12 | 2019-07-30 | 无锡龙翼智能科技有限公司 | A kind of driving circuit of two-way direct current power supply power supply |
| CN111290317B (en) * | 2020-02-24 | 2023-03-21 | 重庆长安新能源汽车科技有限公司 | CAN control module, CAN emergency shutdown channel circuit and vehicle |
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