CN204993069U - Switching power supply circuit based on parallelly connected technique of flow equalizing - Google Patents
Switching power supply circuit based on parallelly connected technique of flow equalizing Download PDFInfo
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- CN204993069U CN204993069U CN201520642334.9U CN201520642334U CN204993069U CN 204993069 U CN204993069 U CN 204993069U CN 201520642334 U CN201520642334 U CN 201520642334U CN 204993069 U CN204993069 U CN 204993069U
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Abstract
The utility model provides a switching power supply circuit based on parallelly connected technique of flow equalizing. It includes three - phase rectifier and filter circuit and a plurality of parallelly connected constant voltage power supply, three - phase rectifier and filter circuit includes and three -phase full -bridge rectifier circuit and capacitor filter circuit is connected with the mud turbogenerator, constant voltage power supply swashs formula transformer, high frequency rectification filter circuit, sampling feedback circuit, PWM control circuit and the circuit that flow equalizes including turning over. The utility model provides a switching power supply circuit based on parallelly connected technique of flow equalizing's effect: in can being applied to the power supply system of adoption ecu's intelligent drilling tool, according to the load demand, provide the galvanic current ability, it is lower to have solved monolithic switching power supply circuit output, is difficult to satisfy the not enough of high power load demand to and the unbalanced problem of polylith switching power supply circuit parallel operation load, strengthened the ability that intelligent drilling tool carried the load, stability and life when having improved the operation.
Description
Technical field
The utility model relates to a kind of down-hole power circuit for intelligent drilling instrument, particularly relates to a kind of inverse-excitation type switch power-supply circuit based on Current Sharing Technology, belongs to oil and gas well drilling field.
Background technology
Power supply is the heart of electronic equipment, and its quality directly affects the unfailing performance of electronic equipment, and 60% of equipment fault all has direct relation with power supply.The power supply that present electronic product uses is roughly divided into linear stabilized power supply and switching power supply, the power device of linear stabilized power supply is operated in amplification region, shortcoming is that conversion efficiency is low, generally only has 30%-60%, the power device of switching power supply is operated on off state, and conversion efficiency can reach 70%-95%.
Require different to power supply reliability according to load, switching power supply has three kinds to run mode of operation: centralized unit operation pattern, and this kind of mode only has a power supply powering load; Parallel running mode, this kind of mode utilizes multiple stage power sources in parallel powering load, the average carry load power of each power supply; Parallel redundancy operation pattern, adopt multiple stage Voltage stabilizing module powering load in parallel, separately have n platform parallel connection power supply power supply in support, when work at present module breaks down, backup module can put into operation.Centralized unit operation mode configuration is simple, and cost is low, but poor reliability; Parallel running mode and parallel redundancy operation mode reliability higher, but cost is also higher.Parallel running is one of developing direction of power technology, is also the key realizing combination high power system.
Mud turbine generator is adopted to carry out the intelligent drilling instrument of powering, there is mud flow rate fluctuation large, the AC voltage fluctuations wide ranges that mud turbine generator produces and by features such as electrical load power are larger, adopt inverse-excitation type switch power-supply technology can obtain galvanic current can export, but the electric energy that monolithic stabilized voltage power supply only can obtain about 50W exports, the demand of high-power electric loading cannot be met, therefore based on Current Sharing Technology, according to intelligent drilling instrument electronic control unit demand, polylith flyback switch voltage-stabilized source is together in parallel, obtain larger power output, strengthen intelligent drilling instrument and take load-carrying ability, the stability during underground work of raising instrument and fail safe, there is important theory significance and using value.
Summary of the invention
In order to solve the problem, the purpose of this utility model is to provide a kind of switching power circuit based on Current Sharing Technology.
In order to achieve the above object, the switching power circuit based on Current Sharing Technology that the utility model provides comprises: the stabilized voltage power supply of three phase rectifier filter circuit and multiple parallel connection, wherein three phase rectifier filter circuit comprises three-phase bridge rectification circuit and capacitor filter, is connected with mud turbine generator, can convert thick direct current energy to, export each shunt voltage stabilizing power source to for the three-phase low-frequency ac produced by mud turbine generator, the output of stabilized voltage power supply is connected with electronic control unit, stabilized voltage power supply comprises flyback transformer, rectifier filter circuit, sampling feedback circuit, pwm control circuit and flow equalizing circuit, wherein: the input of flyback transformer is the input of stabilized voltage power supply in parallel, be connected with three phase rectifier filter circuit, the output of flyback transformer is connected with the input of rectifier filter circuit, the output of rectifier filter circuit is the output of stabilized voltage power supply, be connected with electronic control unit, the input of sampling feedback circuit is connected with flyback transformer and rectifier filter circuit, the output of sampling feedback circuit is connected with pwm control circuit, the sampling input of flow equalizing circuit is connected with the output loop of high-frequency rectification circuit, flow equalizing circuit has current sharing signal terminals, in the stabilized voltage power supply of each parallel connection, the current sharing signal terminals of flow equalizing circuit is all interconnected by current equalizing bus bar LS, the output of flow equalizing circuit is connected with sampling feedback circuit, the output of pwm control circuit is connected with flyback transformer.
Described flow equalizing circuit comprises: the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the second electric capacity C2, the 3rd electric capacity C3 and current-sharing chip U1; Wherein: one end of the 8th resistance R8 is connected with the output of rectifier filter circuit, and the other end is connected with electronic control unit 310; One end of 9th resistance R9 is connected with the output of rectifier filter circuit, and the other end is connected with second pin of current-sharing chip U1; One end of tenth resistance R10 is connected with electronic control unit, and the other end is connected with first pin of current-sharing chip U1; One end of 11 resistance R11 is connected with the 5th pin of current-sharing chip U1, and the other end is connected with sampling feedback circuit 13; One end of second electric capacity C2 is connected with first pin of current-sharing chip U1, and the other end is connected with the 8th pin of current-sharing chip U1; One end of 3rd electric capacity C3 is connected with the 4th pin of current-sharing chip U1, and the other end is connected with the 6th pin of current-sharing chip U1; 3rd pin of current-sharing chip U1 is power end, is connected with+5V power supply, and the 4th pin is ground terminal, and the 7th pin is current-sharing signal input part, is connected with current equalizing bus bar LS.
Described current-sharing chip U1 adopts UC29002D chip.
Described three phase rectifier filter circuit comprises the filter circuit that the three-phase bridge rectification circuit 2101 that is made up of rectifier diode D1-D6 and first to fourth electrochemical capacitor E1-E4 form; The input of three-phase bridge rectification circuit is connected with three-phase low-frequency ac energy output U, V, W of mud turbine generator, the output of three-phase bridge rectification circuit is connected with filter circuit, in filter circuit, after first electrochemical capacitor E1 and the second electrochemical capacitor E2 is connected in series, parallel with one anotherly again after being connected in series with the 3rd electrochemical capacitor E3 and the 4th electrochemical capacitor E4 to be connected, for the ripple component in filtering three-phase bridge rectification circuit DC power output, the output voltage of filter circuit is designated as V
in, its output is connected with the stabilized voltage power supply of each parallel connection.
Described flyback transformer comprises former limit winding, vice-side winding, power device Q1 and peripheral circuit; The thick direct current energy V that three phase rectifier filter circuit exports
recthe former limit winding of input flyback transformer, within the time of power device Q1 conducting, flyback transformer is by thick direct current energy V
inconvert high-frequency ac electric energy to, be stored in the winding of former limit, within the time that power device Q1 turns off, the high-frequency ac electric energy be stored in the winding of former limit is delivered in vice-side winding, electric capacity C1 and diode D7 forms peak holding circuit, resistance R1 provides discharge loop for electric capacity C1, and the vice-side winding of flyback transformer is the output of flyback transformer.
Described rectifier filter circuit comprises half-wave rectifying circuit and capacitor filter; The input of half-wave rectifying circuit is the input of rectifier filter circuit, be connected with the output of flyback transformer, half-wave rectifying circuit is made up of diode D8, for carrying out halfwave rectifier to the high-frequency ac voltage that flyback transformer exports in time of turning off at power device Q1, capacitor filter is made up of electric capacity E5, for the ripple component in filtering half-wave rectifying circuit output voltage; The output of rectifier filter circuit is connected with electronic control unit, and diode D9 is for limiting reverse voltage.
Described sampling feedback circuit comprises current sample feedback circuit and voltage sample feedback circuit, current sample feedback circuit is by the source class electric current of the 4th resistance R4 sampled power device Q1, compare with the output signal of pwm control circuit medial error amplifier after the 5th resistance R5, voltage sample feedback circuit is sampled from the capacitor filter output of rectifier filter circuit, compare with the reference voltage in pwm control circuit after the 6th resistance R6 and the 7th resistance R7 dividing potential drop, Double Loop Control System is formed with current sample feedback circuit, for regulating the dutyfactor value of pwm control circuit output pulse signal in one-period.
The effect of the switching power circuit based on Current Sharing Technology that the utility model provides: can be applicable in the electric power system of the intelligent drilling instrument adopting electronic control unit, according to loading demand, galvanic current energy is provided, solve monolithic switching power circuit power output lower, be difficult to the deficiency meeting high power load demand, and the problem of polylith switching power circuit parallel running load imbalance, strengthen intelligent drilling instrument and take load-carrying ability, stability during raising instrument underground work, fail safe and useful life.
Accompanying drawing explanation
The switching power circuit based on Current Sharing Technology that Fig. 1 provides for the utility model forms block diagram.
Fig. 2 for the utility model provide based on parallel current-equalizing circuit figure in the switching power circuit of Current Sharing Technology.
Fig. 3 for the utility model provide based on three phase rectifier filter circuit schematic diagram in the switching power circuit of Current Sharing Technology.
Fig. 4 for the utility model provide based on stabilized voltage power supply one embodiment circuit theory diagrams in the switching power circuit of Current Sharing Technology.
Fig. 5 is the current-sharing measure of merit curve chart of the utility model based on switching power circuit one embodiment of Current Sharing Technology.Wherein Fig. 5 (a) output current that is the stabilized voltage power supply of each parallel connection is along with the change curve of the increase of load current; The equal flow curve of the output current that Fig. 5 (b) is the stabilized voltage power supply of each parallel connection under different loads electric current; The current-sharing error curve of the output current that Fig. 5 (c) is the stabilized voltage power supply of each parallel connection under different loads electric current.
Embodiment
Below in conjunction with the drawings and specific embodiments, the switching power circuit based on Current Sharing Technology that the utility model provides is described in detail.
The switching power circuit based on Current Sharing Technology that the utility model provides is theoretical based on pulse-width modulation switching power supply, convert the threephase AC electric energy that mud turbine generator produces to galvanic current can export, according to loading demand, adopt parallel running mode, be together in parallel multiple stabilized voltage power supply powering load, utilize flow equalize technology to realize the average carry load power of each power supply, power for intelligent drilling instrument electronic control unit.
As shown in Figure 1, the switching power circuit based on Current Sharing Technology that the utility model provides comprises:
The stabilized voltage power supply 1 of three phase rectifier filter circuit 210 and multiple parallel connection, wherein three phase rectifier filter circuit 210 comprises three-phase bridge rectification circuit and capacitor filter, be connected with mud turbine generator 110, three-phase low-frequency ac for being produced by mud turbine generator 110 can convert thick direct current energy to, exports each shunt voltage stabilizing power source 1 to, the output of stabilized voltage power supply 1 is connected with electronic control unit 310, stabilized voltage power supply 1 comprises flyback transformer 11, rectifier filter circuit 12, sampling feedback circuit 13, pwm control circuit 15 and flow equalizing circuit 14, wherein: the input of flyback transformer 11 is the input of stabilized voltage power supply 1 in parallel, be connected with three phase rectifier filter circuit 210, the output of flyback transformer 11 is connected with the input of rectifier filter circuit 12, the output of rectifier filter circuit 12 is the output of stabilized voltage power supply 1, be connected with electronic control unit 310, the input of sampling feedback circuit 13 is connected with flyback transformer 11 and rectifier filter circuit 12, the output of sampling feedback circuit 13 is connected with pwm control circuit 15, the sampling input of flow equalizing circuit 14 is connected with the output loop of high-frequency rectification circuit 12, flow equalizing circuit 14 has current sharing signal terminals, in the stabilized voltage power supply 1 of each parallel connection, the current sharing signal terminals of flow equalizing circuit 14 is all interconnected by current equalizing bus bar LS, the output of flow equalizing circuit 14 is connected with sampling feedback circuit 13, the output of pwm control circuit 15 is connected with flyback transformer 11.
Flyback transformer 11 comprises former limit winding, vice-side winding and power device, former limit winding energy storage in power device ON time, within the power device turn-off time by the energy transferring that is stored in the winding of former limit to vice-side winding; Rectifier filter circuit 12 comprises half-wave rectifying circuit and capacitor filter, and the high-frequency ac electric energy for being exported by flyback transformer 11 vice-side winding converts galvanic current to and can export; Sampling feedback circuit 13 comprises voltage feedback circuit and current feedback circuit, pwm control circuit 15 is according to the sampled value of sampling feedback circuit 13, the dutyfactor value of adjustment impulse waveform in one-period, thus control power device conducting and turn-off time in one-period, reach the object of regulated output voltage, flow equalizing circuit 14, by the loop current of the stabilized voltage power supply 1 of each parallel connection of sampling, adjusts the output voltage of the stabilized voltage power supply 1 of each parallel connection, thus realizes the object of load balancing.
The threephase AC electric energy that mud turbine generator 110 produces exports the stabilized voltage power supply 1 of multiple parallel connection to through three phase rectifier filter circuit 210, the quantity of stabilized voltage power supply 1 is determined according to load power demand, flyback transformer 11 in each stabilized voltage power supply 1 receives the thick direct current energy that three phase rectifier filter circuit 210 exports, be converted into high-frequency ac electric energy to carry out storing and transmitting, rectifier filter circuit 12 receives the high-frequency ac electric energy that flyback transformer 11 exports, be converted into galvanic current can export, sampling feedback circuit 13 pairs of stabilized voltage power supplys 1 carry out voltage and current sample, export in pwm control circuit 15, flow equalizing circuit 14 is sampled from the output loop of stabilized voltage power supply 1, maximum current method is adopted to carry out load balancing, multiple stabilized voltage power supply 1 is connected by current equalizing bus bar LS, on current equalizing bus bar LS, the current value of the stabilized voltage power supply 1 that electric current is maximum is as reference current, other stabilized voltage power supply 1 is with its electric current respective for benchmark adjusts, flow equalizing circuit 14 exports sampling feedback circuit 13 to, pwm control circuit 15 is according to the Energy Transfer ratio of the output adjustment flyback transformer 11 of sampling feedback circuit 13 and flow equalizing circuit 14, reach the object of regulated output voltage.
As shown in Figure 2, described flow equalizing circuit 14 comprises: the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the second electric capacity C2, the 3rd electric capacity C3 and current-sharing chip U1; Wherein: one end of the 8th resistance R8 is connected with the output of rectifier filter circuit 12, and the other end is connected with electronic control unit 310; One end of 9th resistance R9 is connected with the output of rectifier filter circuit 12, and the other end is connected with second pin of current-sharing chip U1; One end of tenth resistance R10 is connected with electronic control unit 310, and the other end is connected with first pin of current-sharing chip U1; One end of 11 resistance R11 is connected with the 5th pin of current-sharing chip U1, and the other end is connected with sampling feedback circuit 13; One end of second electric capacity C2 is connected with first pin of current-sharing chip U1, and the other end is connected with the 8th pin of current-sharing chip U1; One end of 3rd electric capacity C3 is connected with the 4th pin of current-sharing chip U1, and the other end is connected with the 6th pin of current-sharing chip U1; 3rd pin of current-sharing chip U1 is power end, is connected with+5V power supply, and the 4th pin is ground terminal, and the 7th pin is current-sharing signal input part, is connected with current equalizing bus bar LS.
Described current-sharing chip U1 adopts UC29002D chip, 8th resistance R8 is sampling resistor, for carrying out current sample to the output loop of rectifier filter circuit 12, first pin CS-and the second pin CS+ of current-sharing chip U1 are input, the first pin CS-of current-sharing chip U1 is connected with one end of the 8th resistance R8 by the tenth resistance R10, the second pin CS+ of current-sharing chip U1 is connected with the other end of the 8th resistance R8 by the 9th resistance R9, the 3rd pin VDD of current-sharing chip U1 is power end, connect+5V direct voltage, the 4th pin GND of current-sharing chip U1 is earth terminal, the 5th pin ADJ of current-sharing chip U1 is output, be connected with dividing potential drop the 6th resistance R6 in voltage sample feedback circuit 132 in sampling feedback circuit 13 by the 11 resistance R11, the 6th pin EAO of current-sharing chip U1 is connected with ground wire by the 3rd electric capacity C3, the 7th pin LS of current-sharing chip U1 is current equalizing bus bar link, the 8th pin CSO of current-sharing chip U1 is connected with the first pin CS-with the second electric capacity C2 by the 11 resistance R11.The magnitude of voltage inputted from the first pin CS-and the second pin CS+ of current-sharing chip U1 carries out differential amplification in current-sharing chip U1 inside, maximum current-equalizing method is adopted to carry out load balancing, each stabilized voltage power supply 1 is connected by current equalizing bus bar LS, the current value of the stabilized voltage power supply 1 that on current equalizing bus bar LS, electric current is maximum is as reference current, other stabilized voltage power supply 1 is with its electric current respective for benchmark adjusts, adjustment voltage is exported by the 6th pin ADJ of current-sharing chip U1, input together with sampling feedback circuit 13 in pwm control circuit 15, for adjusting the dutyfactor value of pwm pulse signal in one-period, reach the object of regulated output voltage.
As shown in Figure 3, three phase rectifier filter circuit 210 comprises the filter circuit 2102 that the three-phase bridge rectification circuit 2101 that is made up of rectifier diode D1-D6 and first to fourth electrochemical capacitor E1-E4 form; The input of three-phase bridge rectification circuit 2101 is connected with three-phase low-frequency ac energy output U, V, W of mud turbine generator 110, the output of three-phase bridge rectification circuit 2101 is connected with filter circuit 2102, in filter circuit 2102, after first electrochemical capacitor E1 and the second electrochemical capacitor E2 is connected in series, parallel with one anotherly again after being connected in series with the 3rd electrochemical capacitor E3 and the 4th electrochemical capacitor E4 to be connected, for the ripple component in filtering three-phase bridge rectification circuit 2101 DC power output, the output voltage of filter circuit 2102 is designated as V
in, its output is connected with the stabilized voltage power supply 1 of each parallel connection.
Fig. 4 shows the circuit theory diagrams of an embodiment of stabilized voltage power supply 1 in the utility model; As shown in Figure 4, flyback transformer 11 comprises former limit winding 111, vice-side winding 112, power device Q1 and peripheral circuit.The thick direct current energy V that three phase rectifier filter circuit 210 exports
recthe former limit winding 111 of input flyback transformer 11, within the time of power device Q1 conducting, flyback transformer 11 is by thick direct current energy V
inconvert high-frequency ac electric energy to, be stored in former limit winding 111, within the time that power device Q1 turns off, the high-frequency ac electric energy be stored in former limit winding 111 is delivered in vice-side winding 112, electric capacity C1 and diode D7 forms peak holding circuit, resistance R1 provides discharge loop for electric capacity C1, and the vice-side winding 112 of flyback transformer 11 is the output of flyback transformer 11.
Rectifier filter circuit 12 comprises half-wave rectifying circuit and capacitor filter; The input of half-wave rectifying circuit is the input of rectifier filter circuit 12, be connected with the output of flyback transformer 11, half-wave rectifying circuit is made up of diode D8, for carrying out halfwave rectifier to the high-frequency ac voltage that flyback transformer 11 exports in time of turning off at power device Q1, capacitor filter is made up of electric capacity E5, for the ripple component in filtering half-wave rectifying circuit output voltage; The output of rectifier filter circuit 12 is connected with electronic control unit 310, and diode D9 is for limiting reverse voltage.
Sampling feedback circuit 13 comprises current sample feedback circuit 131 and voltage sample feedback circuit 132, current sample feedback circuit 131 is by the source class electric current of the 4th resistance R4 sampled power device Q1, compare with the output signal of pwm control circuit 15 medial error amplifier after the 5th resistance R5, voltage sample feedback circuit 132 is sampled from the capacitor filter output of rectifier filter circuit 12, compare with the reference voltage in pwm control circuit 15 after the 6th resistance R6 and the 7th resistance R7 dividing potential drop, Double Loop Control System is formed with current sample feedback circuit 131, for regulating the dutyfactor value of pwm control circuit 15 output pulse signal in one-period.
Described pwm control circuit 15 exports the impulse waveform of certain frequency, by the base stage of input power device Q1 after the second resistance R2 and the 3rd resistance R3 dividing potential drop, according to the output voltage of sampling feedback circuit 13 value of feedback and flow equalizing circuit 14, the dutyfactor value in adjustment impulse waveform each cycle, thus control conducting and the turn-off time of power device Q1, the thick direct current energy V exported by current rectifying and wave filtering circuit 210
recconvert high-frequency ac electric energy to, by stored energy and the transmission of flyback transformer 11, export the stable DC electric energy V meeting electronic control unit 310 power demand
out.
Be illustrated in figure 5 the current-sharing measure of merit curve chart of the utility model one embodiment, experimental condition is: the mode adopting the parallel connection of 4 pieces of stabilized voltage power supplys 1, mud turbine generator 110 rotating speed 4000rpm, the output of stabilized voltage power supply 1 connects CC E-load, load current excursion is 0A-3A, the abscissa of Fig. 5 (a) is load current change, ordinate is the change curve of output current along with the increase of load current of the stabilized voltage power supply 1 of each parallel connection, visible curve 1-4 overlaps substantially, and current-sharing is respond well; The abscissa of Fig. 5 (b) is the numbering of the stabilized voltage power supply 1 of each parallel connection, and ordinate is the equal flow curve of output current under different loads electric current of the stabilized voltage power supply 1 of each parallel connection, and visible each curve keeps level substantially, and current-sharing is respond well; The abscissa of Fig. 5 (c) is the numbering of the stabilized voltage power supply 1 of each parallel connection, ordinate is the current-sharing error curve of output current under different loads electric current of the stabilized voltage power supply 1 of each parallel connection, visible maximum current-sharing error amount is 0.034A, current-sharing is respond well, and the test data corresponding with Fig. 5 (a)-Fig. 5 (c) is as shown in table 1.
Table 1 is based on the switching power circuit current-sharing measure of merit of Current Sharing Technology
During work, the range of speeds of mud turbine generator 110 is 2500rpm to 5500rpm, the thick direct voltage V exported after current rectifying and wave filtering circuit 210
recscope is 60V-160V, adopt the working method of 4 pieces of stabilized voltage power supply parallel connections, the direct voltage that monolithic stabilized voltage power supply 1 exports is 36V, electric current is 1A, load balancing is carried out by flow equalizing circuit 14, with the dutyfactor value of sampling feedback circuit 13 co-controlling pwm pulse signal in one-period, thus export the stable DC electric energy meeting loading demand.
The switching power circuit based on Current Sharing Technology that the utility model provides carries out the intelligent drilling instrument of powering for adopting mud turbine generator, there is mud flow rate fluctuation large, the AC voltage fluctuations wide ranges produced and by features such as electrical load power are larger, adopt inverse-excitation type switch power-supply technology can obtain galvanic current can export, but the electric energy that monolithic stabilized voltage power supply only can obtain about 50W exports, the demand of high-power electric loading cannot be met, based on Current Sharing Technology, according to intelligent drilling instrument electronic control unit demand, polylith flyback switch voltage-stabilized source is together in parallel, obtain larger power output, there is important theory significance and using value.
Claims (7)
1. based on a switching power circuit for Current Sharing Technology, it is characterized in that: the described switching power circuit based on Current Sharing Technology comprises: the stabilized voltage power supply (1) of three phase rectifier filter circuit (210) and multiple parallel connection, wherein three phase rectifier filter circuit (210) comprises three-phase bridge rectification circuit and capacitor filter, be connected with mud turbine generator (110), three-phase low-frequency ac for being produced by mud turbine generator (110) can convert thick direct current energy to, exports each shunt voltage stabilizing power source (1) to, the output of stabilized voltage power supply (1) is connected with electronic control unit (310), stabilized voltage power supply (1) comprises flyback transformer (11), rectifier filter circuit (12), sampling feedback circuit (13), pwm control circuit (15) and flow equalizing circuit (14), wherein: the input of flyback transformer (11) is the input of stabilized voltage power supply (1) in parallel, be connected with three phase rectifier filter circuit (210), the output of flyback transformer (11) is connected with the input of rectifier filter circuit (12), the output of rectifier filter circuit (12) is the output of stabilized voltage power supply (1), be connected with electronic control unit (310), the input of sampling feedback circuit (13) is connected with flyback transformer (11) and rectifier filter circuit (12), the output of sampling feedback circuit (13) is connected with pwm control circuit (15), the sampling input of flow equalizing circuit (14) is connected with the output loop of high-frequency rectification circuit (12), flow equalizing circuit (14) has current sharing signal terminals, in the stabilized voltage power supply (1) of each parallel connection, the current sharing signal terminals of flow equalizing circuit (14) is all interconnected by current equalizing bus bar LS, the output of flow equalizing circuit (14) is connected with sampling feedback circuit (13), the output of pwm control circuit (15) is connected with flyback transformer (11).
2. the switching power circuit based on Current Sharing Technology according to claim 1, is characterized in that: described flow equalizing circuit (14) comprising: the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the second electric capacity C2, the 3rd electric capacity C3 and current-sharing chip U1; Wherein: one end of the 8th resistance R8 is connected with the output of rectifier filter circuit (12), and the other end is connected with electronic control unit (310); One end of 9th resistance R9 is connected with the output of rectifier filter circuit (12), and the other end is connected with second pin of current-sharing chip U1; One end of tenth resistance R10 is connected with electronic control unit (310), and the other end is connected with first pin of current-sharing chip U1; One end of 11 resistance R11 is connected with the 5th pin of current-sharing chip U1, and the other end is connected with sampling feedback circuit (13); One end of second electric capacity C2 is connected with first pin of current-sharing chip U1, and the other end is connected with the 8th pin of current-sharing chip U1; One end of 3rd electric capacity C3 is connected with the 4th pin of current-sharing chip U1, and the other end is connected with the 6th pin of current-sharing chip U1; 3rd pin of current-sharing chip U1 is power end, is connected with+5V power supply, and the 4th pin is ground terminal, and the 7th pin is current-sharing signal input part, is connected with current equalizing bus bar LS.
3. the switching power circuit based on Current Sharing Technology according to claim 2, is characterized in that: described current-sharing chip U1 adopts UC29002D chip.
4. the switching power circuit based on Current Sharing Technology according to claim 1, is characterized in that: described three phase rectifier filter circuit (210) comprises the filter circuit (2102) that the three-phase bridge rectification circuit (2101) that is made up of rectifier diode D1-D6 and first to fourth electrochemical capacitor E1-E4 form, the input of three-phase bridge rectification circuit (2101) and the three-phase low-frequency ac energy output U of mud turbine generator (110), V, W connects, the output of three-phase bridge rectification circuit (2101) is connected with filter circuit (2102), in filter circuit (2102), after first electrochemical capacitor E1 and the second electrochemical capacitor E2 is connected in series, parallel with one anotherly again after being connected in series with the 3rd electrochemical capacitor E3 and the 4th electrochemical capacitor E4 to be connected, for the ripple component in filtering three-phase bridge rectification circuit (2101) DC power output, the output voltage of filter circuit (2102) is designated as V
in, its output is connected with the stabilized voltage power supply (1) of each parallel connection.
5. the switching power circuit based on Current Sharing Technology according to claim 1, is characterized in that: described flyback transformer (11) comprises former limit winding (111), vice-side winding (112), power device Q1 and peripheral circuit; The thick direct current energy V that three phase rectifier filter circuit (210) exports
recformer limit winding (111) of input flyback transformer (11), within the time of power device Q1 conducting, flyback transformer (11) is by thick direct current energy V
inconvert high-frequency ac electric energy to, be stored in former limit winding (111), within the time that power device Q1 turns off, the high-frequency ac electric energy be stored in former limit winding (111) is delivered in vice-side winding (112), electric capacity C1 and diode D7 forms peak holding circuit, resistance R1 provides discharge loop for electric capacity C1, the output that the vice-side winding (112) of flyback transformer (11) is flyback transformer (11).
6. the switching power circuit based on Current Sharing Technology according to claim 1, is characterized in that: described rectifier filter circuit (12) comprises half-wave rectifying circuit and capacitor filter; The input of half-wave rectifying circuit is the input of rectifier filter circuit (12), be connected with the output of flyback transformer (11), half-wave rectifying circuit is made up of diode D8, for in time of turning off at power device Q1, halfwave rectifier is carried out to the high-frequency ac voltage that flyback transformer (11) exports, capacitor filter is made up of electric capacity E5, for the ripple component in filtering half-wave rectifying circuit output voltage; The output of rectifier filter circuit (12) is connected with electronic control unit (310), and diode D9 is for limiting reverse voltage.
7. the switching power circuit based on Current Sharing Technology according to claim 1, it is characterized in that: described sampling feedback circuit (13) comprises current sample feedback circuit (131) and voltage sample feedback circuit (132), current sample feedback circuit (131) is by the source class electric current of the 4th resistance R4 sampled power device Q1, compare with the output signal of pwm control circuit (15) medial error amplifier after the 5th resistance R5, voltage sample feedback circuit (132) is sampled from the capacitor filter output of rectifier filter circuit (12), compare with the reference voltage in pwm control circuit (15) after the 6th resistance R6 and the 7th resistance R7 dividing potential drop, Double Loop Control System is formed with current sample feedback circuit (131), for regulating the dutyfactor value of pwm control circuit (15) output pulse signal in one-period.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162331A (en) * | 2015-08-24 | 2015-12-16 | 中国石油集团渤海钻探工程有限公司 | Paralleled current sharing technology-based switching power supply circuit |
| CN106094522A (en) * | 2016-06-30 | 2016-11-09 | 温州大学 | The parallel operation system module number controlling method of weighted sum matrix is expected based on efficiency and current-sharing deviation |
| CN108880288A (en) * | 2018-09-10 | 2018-11-23 | 广东电网有限责任公司 | Three-phase alternating-current switch power supply device and system |
| CN113131604A (en) * | 2021-04-29 | 2021-07-16 | 电子科技大学 | Automatic control system for current-sharing output of redundant power supply |
-
2015
- 2015-08-24 CN CN201520642334.9U patent/CN204993069U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162331A (en) * | 2015-08-24 | 2015-12-16 | 中国石油集团渤海钻探工程有限公司 | Paralleled current sharing technology-based switching power supply circuit |
| CN106094522A (en) * | 2016-06-30 | 2016-11-09 | 温州大学 | The parallel operation system module number controlling method of weighted sum matrix is expected based on efficiency and current-sharing deviation |
| CN106094522B (en) * | 2016-06-30 | 2018-11-06 | 温州大学 | Parallel operation system module number controlling method |
| CN108880288A (en) * | 2018-09-10 | 2018-11-23 | 广东电网有限责任公司 | Three-phase alternating-current switch power supply device and system |
| CN108880288B (en) * | 2018-09-10 | 2024-01-12 | 广东电网有限责任公司 | Three-phase alternating current switching power supply device and system |
| CN113131604A (en) * | 2021-04-29 | 2021-07-16 | 电子科技大学 | Automatic control system for current-sharing output of redundant power supply |
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