CN104571250A - Parallel high-power switching power supply - Google Patents
Parallel high-power switching power supply Download PDFInfo
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- CN104571250A CN104571250A CN201510068492.2A CN201510068492A CN104571250A CN 104571250 A CN104571250 A CN 104571250A CN 201510068492 A CN201510068492 A CN 201510068492A CN 104571250 A CN104571250 A CN 104571250A
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Abstract
The invention relates to the field of high-power switching power supply, and in particular to a parallel high-power switching power supply. The parallel high-power switching power supply comprises a system control unit, more than one parallel power unit and a system feedback unit, wherein the input end of the system feedback unit is connected with master output loops of the parallel power units; the output end of the system feedback unit is connected with the input end of the system control unit; the output end of the system control unit is connected with control ends of the power units. According to the parallel high-power switching power supply, various power unit setting modes are combination of analogue setting and communication setting; the reliability of the power supply is improved; meanwhile, the parallel high-power switching power supply comprises the system feedback unit; and overall closed-loop adjustment of the system is achieved by three feedback units such as current divider feedback, hall feedback and inner feedback current superposition.
Description
Technical field
The present invention relates to high power switching power supply field, particularly a kind of parallel great power Switching Power Supply.
Background technology
Along with the development in epoch, the application of large power supply is more and more extensive, simultaneously, different industries is to the voltage of large power supply, electric current has different demands, this power supply product of will seeking common ground, preferably multiple voltage can be provided, current class, in order to this market demand can be adapted to, strengthen the dirigibility of power-supply system, parallel great power Switching Power Supply is arisen at the historic moment, but existing parallel great power Switching Power Supply only has feedback circuit at the power cell internal of each parallel connection mostly, and between each power cell, lack effectively cooperation, cause thus the stability of parallel great power power source integral and reliability poor.
Summary of the invention
The object of the invention is to the problem that stability and reliability in order to overcome existing parallel great power power source integral is poor, providing between a kind of each power cell of parallel connection and coordinating more effective parallel great power Switching Power Supply.
In order to achieve the above object, the technical solution used in the present invention is: a kind of parallel great power Switching Power Supply comprises the power cell of system control unit and a more parallel, described parallel great power Switching Power Supply also comprises system feedback unit, the input end of described system feedback unit is connected with total output loop of power cell in parallel, the output terminal of described system feedback unit is connected with the input end of described system control unit, and the output terminal of described system control unit is connected with the control end of each power cell.
Described system control unit is used for exporting control signal to each power cell of parallel connection, in order to control the operation of each power cell, described control signal comprises start stop signal, synchronizing signal, start stop signal is for controlling the start and stop of each power cell, and synchronizing signal is under ensureing that the power cell of each parallel connection is operated in identical sequential; Described system feedback unit is used for each power cell output voltage values and total output current value to feed back to system control unit.
Further, described power cell comprises power control unit, driver element, main loop unit and internal feedback unit.
The control end of described power control unit is connected with the output terminal of described system control unit; The input end of described power control unit is connected with the output terminal of described internal feedback unit; The output terminal of described power control unit is connected with the input end of described driver element; The output terminal of described driver element is connected with the control end of described main loop unit; The input end of described main loop unit is connected with AC power, and the output terminal of described main loop unit is connected with load and described internal feedback unit simultaneously.
Described internal feedback unit be used for by according to different modes (as shunt feedback system, Hall feedback system) from as described in main loop unit the output terminal voltage, the current value that collect carry out standardization and the voltage feedback value of outputting standard, current feedback values; Described power control unit is used for the control signal of receiving system control module, and produces driving pulse according to the control signal of the voltage feedback value of described internal feedback unit feedback, current feedback values and described system control unit; Described driver element is used for being amplified by the drive pulse signal that described power control unit produces and detecting the duty of main loop unit; Described main loop unit be used for external AC power supply carry out friendships straight-friendship directly converts.
Further, described power control unit comprises reference voltage unit, analog quantity processing unit, logic controller, voltage and current regulator and pulse width regulator; Described voltage and current regulator comprises Setting signal receiving port; Described pulse width regulator comprises clock signal receiving port and enable signal receiving port.
Logic controller is connected with described voltage and current regulator and pulse width regulator and controls the operation of above-mentioned unit, described reference voltage unit is to described voltage and current regulator output reference voltage, described analog quantity processing unit is connected with described internal feedback unit output terminal, and it transfers to described voltage and current regulator for the simulation Setting signal voltage feedback value received, current feedback values and system control unit sent after analog quantity process; Described voltage and current regulator carries out adjudicating according to the voltage feedback value received, current feedback values, reference voltage, Setting signal (simulation Setting signal is the one of Setting signal) and exports pulse regulation signal to described pulse width regulator; Described pulse width regulator exports driving pulse according to the pulse regulation signal received, clock signal, enable start stop signal.
Further, described voltage and current regulator comprises the first selector switch, the second selector switch, voltage PI regulator, current PI regulator; The input end of described first selector switch is connected with described reference voltage unit, and two output terminals of the first selector switch are connected with the first input end of described voltage PI regulator, the first input end of current PI regulator respectively; The input end of described second selector switch is Setting signal receiving port, and two output terminals of the second selector switch are connected with the first input end of described voltage PI regulator, the first input end of current PI regulator respectively; Second input end of voltage PI regulator is used for receiver voltage value of feedback, and the second input port of current PI regulator is used for received current value of feedback; The output terminal of described voltage PI regulator, the output terminal of current PI regulator all export pulse regulation signal.
Further, described power control unit also comprises communication unit, described communication unit carries out communication for described power control unit with described system control unit and is connected, described communication unit is also for receiving the communication Setting signal of described system control unit transmission and being sent to described logic controller, and described communication Setting signal is the one of Setting signal.
Further, described power control unit also comprises converting unit; The input end of described converting unit is connected with described analog quantity processing unit, for receiving the current feedback values through described analog quantity processing unit processes; The current feedback values received is converted to analog current signal according to intended conversion mode and exports described system feedback unit to by described converting unit, under this pattern, system feedback unit eliminates special total current collecting unit, the analog current signal that only each power cell need be transmitted carries out adding up, changing, and can obtain the total current output valve of each power cell.
In other embodiment, system feedback unit comprises shunt feedback unit or Hall feedback unit, described shunt feedback unit or Hall feedback unit are connected with total output loop of the more than one power cell of described parallel connection, for gathering the total current value of each power cell.
Because each power cell is for being arranged in parallel, therefore the magnitude of voltage of total loop is identical with the output voltage of each power cell, system feedback unit directly can gather the magnitude of voltage of total loop or by each power cell, voltage feedback value is directly sent to system feedback unit (directly current feedback values and voltage feedback value are sent in the embodiment of system feedback unit at each power cell, system feedback unit does not need the special current acquisition unit for total loop or voltage acquisition unit).
Further, described power cell also comprises inverter current feedback circuit, inverter current in described main loop unit is fed back to analog quantity processing unit by described inverter current feedback circuit, described pulse width regulator is sent to after the analog quantity process of analog quantity processing unit, when inverter current value is lower than pre-set value, pulse width regulator keeps exporting; When inverter current value is higher than pre-set value, pulse width regulator blocks and exports.
Further, institute's power control unit also comprises digital quantity processing unit, described digital quantity processing unit is used for start stop signal, the synchronizing signal that receiving system control module sends, and be sent to logic controller after above-mentioned signal is carried out digital quantity process, logic controller, according to the start stop signal situation received, sends enable signal to described pulse width regulator; Start stop signal starts or stops work for controlling each power cell simultaneously.
Logic controller, according to the synchronizing signal received, sends clock signal to described pulse width regulator.
Further, described driver element also comprises malfunction monitoring unit, the duty of main loop unit described in described malfunction monitoring unit Real-Time Monitoring, and send fault-signal (described fault-signal comprises malfunction and normal condition two kinds) to described digital quantity processing unit according to monitoring result, described digital quantity processing unit is sent to described pulse width regulator after fault-signal is carried out digital quantity process, blocks driving pulse when pulse width regulator receives after major loop exists the signal of fault.
Compared with prior art, beneficial effect of the present invention: parallel great power Switching Power Supply provided by the invention has following beneficial effect: (1) each power cell given way, by simulating the given and given combination of communication, improves the reliability of power supply.
(2) total current of system feedback unit feeds back the overall closed loop adjustment that three kinds of feedback systems such as compatible shunt feedback system, Hall feedback system, internal feedback electric current stacked system realize system.
(3) there is synchronizing signal, sequential control can be carried out to the driving pulse of each power cell, improve the stability of power supply.
(4) system has the Dual-loop feedback control control of power cell internal feedback unit controls and system feedback unit controls, and the overall work precision of power supply is higher, and stability is better.
Accompanying drawing illustrates:
The parallel great power power supply architecture block diagram that Fig. 1 provides for the embodiment of the present invention 1.
The parallel great power power supply architecture block diagram that Fig. 2 provides for the embodiment of the present invention 2.
Fig. 3 is power control unit structured flowchart in the present invention.
Fig. 4 is voltage and current regulator structural drawing in the present invention.
Mark in figure: 1-system control unit, 2-power cell, 21-power control unit, 211-reference voltage unit, 212-analog quantity processing unit, 213-voltage and current regulator, 214-pulse width regulator, 215-logic controller, 216-communication unit, 217-converting unit, 218-digital quantity processing unit, 22-driver element, 23-main loop unit is with, 24-internal feedback unit, 3-system feedback unit, 31-system total current detection means.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
Embodiment 1: as shown in Figure 1, the object of the invention is to the problem that stability and reliability in order to overcome existing parallel great power power source integral is poor, there is provided between a kind of each power cell of parallel connection and coordinate more effective parallel great power Switching Power Supply, comprise the power cell 2 of system control unit 1 and a more parallel, described high power switching power supply also comprises system feedback unit 3, the input end of described system feedback unit 3 is connected with total output loop of each power cell 2 in parallel, the output terminal of described system feedback unit 2 is connected with the input end of described system control unit 1, the output terminal of described system control unit 1 is connected with the control end of each power cell 2.
Described system control unit 1 exports control signal for each power cell 2 to parallel connection, in order to control the operation of each power cell 2, described control signal comprises start stop signal, synchronizing signal, start stop signal is for controlling the start and stop of each power cell, and synchronizing signal is under ensureing that the power cell of each parallel connection is operated in identical or different sequential; Described system feedback unit 3 feeds back to system control unit 1 for the magnitude of voltage that exported by each power cell 2 and total output current value.
Further, described power cell 2 comprises power control unit 21, driver element 22, main loop unit 23 and internal feedback unit 24.
The control end of described power control unit 21 is connected with the output terminal of described system control unit 1; The input end of described power control unit 21 is connected with the output terminal of described internal feedback unit 24; The output terminal of described power control unit 21 is connected with the input end of described driver element 22; The output terminal of described driver element 22 is connected with the control end of described main loop unit 23; The input end of described main loop unit 23 is connected with AC power, and the output terminal of described main loop unit 23 is connected with load and described internal feedback unit 24 simultaneously.
Described internal feedback unit 24 adopts Hall feedback system to gather its output current value i from described main loop unit 23 output terminal
f, meanwhile, internal feedback unit 24 also receives output voltage u from the output terminal of power cell 2
f, and the voltage feedback value u ' of outputting standard after being carried out standardization
f, current feedback values i '
f; Described power control unit 21 for the control signal of receiving system control module 1, and according to the voltage feedback value u ' that described internal feedback unit 24 feeds back
f, current feedback values i '
fand the control signal of described system control unit 1 produces driving pulse; Described driver element 22 amplifies for the drive pulse signal produced by described power control unit 21; Described main loop unit 23 for external AC power supply is carried out friendship straight-hand over and directly convert.
Further, as shown in Figure 3, described power control unit 21 comprises reference voltage unit 211, analog quantity processing unit 212, logic controller 215, voltage and current regulator 213 and pulse width regulator 214; Described voltage and current regulator 213 comprises Setting signal receiving port; Described pulse width regulator 214 comprises clock signal receiving port, enable signal receiving port.
Logic controller 215 is connected with described voltage and current regulator 213 and pulse width regulator 214 respectively and controls the operation of above-mentioned unit, described reference voltage unit 211 is to described voltage and current regulator 213 output reference voltage, described analog quantity processing unit 212 is connected with described internal feedback unit 24 output terminal, its voltage feedback value u ' for receiving
f, current feedback values i '
fcarry out analog quantity and be treated to Voltage Feedback amount U_FK and current feedback amount I_FK, and transmit it to described voltage and current regulator 213; The simulation Setting signal that system control unit sends also is carried out analog quantity process (described simulation Setting signal is the one of Setting signal GDI_OUT) by described analog quantity processing unit 212 simultaneously, and described voltage and current regulator 213 exports pulse regulation signal SC_XZ to described pulse width regulator 214 according to the Voltage Feedback amount U_FK received, current feedback amount I_FK, reference voltage V ref, Setting signal GDI_OUT; Described pulse width regulator 214 exports drived control pulse according to pulse regulation signal SC_XZ, the clock signal TB (being sent by logic controller 215) that receive, enable signal EN (being sent by logic controller 215).
Further, as shown in Figure 4, described voltage and current regulator 213 comprises the first selector switch Q1, the second selector switch Q2, voltage PI regulator, current PI regulator; The input end of described first selector switch Q1 is connected with described reference voltage unit 211, and two output terminals of the first selector switch Q1 are connected with the first input end of described voltage PI regulator, the first input end of current PI regulator respectively; The Q2 input end of described second selector switch is Setting signal receiving port, and two output terminals of the second selector switch are connected with the first input end of described voltage PI regulator, the first input end of current PI regulator respectively; Second input end of voltage PI regulator is used for receiver voltage value of feedback, and the second input port of current PI regulator is used for received current value of feedback; The output terminal of described voltage PI regulator, the output terminal of current PI regulator all export pulse regulation signal SC_XZ.
When the end 2 of the first selector switch Q1 1 to be connected with end, the end 2 of the second selector switch Q2 be connected with end 1 time (end 2 of Q1, Q2 is input end, end 1, end 3 are output terminal), current feedback values I_FK and Setting signal produce the second regulated quantity after current PI regulator integration amplifies, and voltage feedback value U_FK and voltage restricting signal produce the first regulated quantity after voltage PI regulator integration amplifies.First regulated quantity and the second regulated quantity are isolated by diode D1 and diode D2, and the decision pulse regulation signal SC_XZ that in two regulated quantitys, level is low exports, and diode D3 makes pulse regulation signal SC_XZ consistent with person's level low in first, second regulated quantity.It regulates for power section inner ring Current Negative Three-Point Capacitance, and voltage restriction point can be set by reference voltage Vref, and control mode is now the restriction of current closed-loop voltage.
In like manner, when the end 2 of the first selector switch Q1 is connected with end 3, when the end 2 of the second selector switch Q2 is connected with end 3, voltage feedback value U_FK and Setting signal, current feedback values I_FK and current limiting signal produce respectively and export pulse regulation signal SC_XZ control mode now after voltage PI regulator, current PI regulator integration amplify is voltage close loop current limit.
In the present embodiment, described power control unit 21 also comprises communication unit 216, described communication unit 216 carries out communication for described power control unit 21 with described system control unit 1 and is connected, and it is for being sent to Systematical control 1 by the start and stop of power cell 2, reset, given, failure message, running status; Described communication unit 216 is also for receiving the communication Setting signal of described system control unit 1 transmission and being sent to described logic controller, described communication Setting signal is the one of Setting signal GDI_OUT, and described logic controller selects the Setting signal GDI_OUT sending voltage and current regulator to be that communication Setting signal still simulates Setting signal by control the 3rd selector switch Q3; Two kinds of given ways add the stability of system.
Further, described power control unit 21 also comprises converting unit 217, the input end of described converting unit 217 is connected with described analog quantity processing unit 212, and it is for receiving the current feedback amount I_FK processed through described analog quantity processing unit 212, the current feedback amount I_FK received is converted to analog current signal (the present embodiment is standard analog current signal current feedback amount I_FK being converted to 0 ~ 20mA according to designated ratio) according to intended conversion mode and exports described system feedback unit 3 to by described converting unit 217, the analog current signal that each power cell 2 feeds back to is carried out cumulative conversion by described system feedback unit 3, thus obtain the total loop current value of described high power switching power supply in parallel, in the present embodiment, system feedback unit 3 does not have the detection means of total output current, the mode only adopting the current feedback amount I_F returned by each power cell to carry out superposing obtains the total current value of total loop.
Further, described power cell 2 also comprises inverter current feedback circuit, inverter current in described major loop 23 is fed back to analog quantity processing unit 212 by described inverter current feedback circuit, described pulse width regulator 214 is sent to as inverter current restriction, namely as inverter current value i after analog quantity processing unit 212 processes
nduring lower than pre-set value, pulse width regulator keeps exporting; As inverter current value i
nduring higher than pre-set value, pulse width regulator blocks and exports, and increases the reliability of power work.
Further, institute's power control unit 21 also comprises digital quantity processing unit 218, start stop signal, synchronizing signal that described digital quantity processing unit 218 sends for receiving system control module 1, and be sent to logic controller 215 after above-mentioned signal is carried out digital quantity process, logic controller 215 is according to the start stop signal situation received, send enable signal EN to described pulse width regulator 214, start stop signal starts or stops work for controlling each power cell 2 simultaneously.
Logic controller 215 is also according to the synchronizing signal received, send the clock signal TB frequency of the described clock signal (can according to setting changing) to described pulse width regulator 214, thus ensure that the power cell of each parallel connection can synchronously or asynchronous working.
Further, described driver element 22 also comprises malfunction monitoring unit (not showing in figure), described malfunction monitoring unit is used for the duty of main loop unit 23 described in Real-Time Monitoring, and send fault-signal DRF (described fault-signal comprises malfunction and normal condition two kinds) to described digital quantity processing unit 218 according to monitoring result, described digital quantity processing unit 218 is sent to described pulse width regulator 214 after fault-signal DRF is carried out digital quantity process, driving pulse is blocked immediately when pulse width regulator 214 receives after major loop exists the signal of fault.
Embodiment 2: as shown in Figure 2, in the present embodiment, except the device described in embodiment 1, described system feedback unit also comprises shunt feedback unit or Hall feedback unit 31, described shunt feedback unit or Hall feedback unit 31 are connected with total output loop of described power supply, for gathering the total current value of each power cell.
Described system feedback unit also comprises the 4th selector switch Q4, and the 4th selector switch Q4 is adopt feedback current stacked system to carry out total loop current feedback or adopt shunt feedback system or Hall feedback system to carry out total loop current feedback for selecting described system feedback unit.
Claims (10)
1. a parallel great power Switching Power Supply, comprise the power cell of system control unit and a more parallel, it is characterized in that, also comprise system feedback unit, the input end of described system feedback unit is connected with total output loop of each power cell in parallel, the output terminal of described system feedback unit is connected with the input end of described system control unit, and the output terminal of described system control unit is connected with the control end of each power cell;
Described system control unit is used for exporting control signal to each power cell of parallel connection, in order to control the operation of each power cell, described control signal comprises start stop signal, synchronizing signal, start stop signal is for controlling the start and stop of each power cell, and synchronizing signal is for controlling the work schedule of the power cell of each parallel connection; Described system feedback unit is used for the magnitude of voltage that exported by each power cell and total current value feeds back to system control unit.
2. parallel great power Switching Power Supply as claimed in claim 1, it is characterized in that, described power cell comprises power control unit, driver element, main loop unit and internal feedback unit;
The input end of described power control unit is connected with the output terminal of described internal feedback unit; The output terminal of described power control unit is connected with the input end of described driver element; The output terminal of described driver element is connected with the control end of described main loop unit; The input end of described main loop unit is connected with AC power, and the output terminal of described main loop unit is connected with load and described internal feedback unit simultaneously;
Described power control unit is used for the control signal of receiving system control module, and produces driving pulse according to the control signal of the voltage feedback value of described internal feedback unit feedback, current feedback values and described system control unit; The drive pulse signal that described driver element is used for described power control unit to produce amplifies; Described main loop unit be used for external AC power supply carry out friendships straight-friendship directly converts; Voltage feedback value, current feedback values that described internal feedback unit is used for described main loop unit to export feed back to described power control unit.
3. parallel great power Switching Power Supply as claimed in claim 2, it is characterized in that, described power control unit comprises reference voltage unit, analog quantity processing unit, logic controller, voltage and current regulator and pulse width regulator; Described voltage and current regulator comprises Setting signal receiving port; Described pulse width regulator comprises clock signal receiving port and enable signal receiving port;
Logic controller is connected with described voltage and current regulator and pulse width regulator and controls it and runs, described reference voltage unit is to described voltage and current regulator output reference voltage, described analog quantity processing unit is connected with described internal feedback unit output terminal, its simulation Setting signal sent for voltage feedback value, current feedback values and the system control unit that will receive carries out analog quantity process, and by treated above-mentioned Signal transmissions to described voltage and current regulator; Described voltage and current regulator carries out adjudicating according to the voltage feedback value received, current feedback values, reference voltage, Setting signal and exports pulse regulation signal to described pulse width regulator; Described pulse width regulator exports driving pulse according to the pulse regulation signal received, clock signal, enable start stop signal.
4. parallel great power Switching Power Supply as claimed in claim 3, it is characterized in that, described voltage and current regulator comprises the first selector switch, the second selector switch, voltage PI regulator, current PI regulator; The input end of described first selector switch is connected with described reference voltage unit, and two output terminals of described first selector switch are connected with the first input end of described voltage PI regulator, the first input end of current PI regulator respectively; The input end of described second selector switch is Setting signal receiving port, and two output terminals of described second selector switch are connected with the first input end of described voltage PI regulator, the first input end of current PI regulator respectively; Second input end of described voltage PI regulator is used for receiver voltage value of feedback, and the second input port of described current PI regulator is used for received current value of feedback; The output terminal of described voltage PI regulator, the output terminal of current PI regulator all export pulse regulation signal.
5. parallel great power Switching Power Supply as claimed in claim 3, it is characterized in that, described power control unit also comprises communication unit, described communication unit is connected with described logic controller, described communication unit is used for described power control unit and described system control unit carries out communication, and described communication unit is also for receiving the communication Setting signal of described system control unit transmission and being sent to described logic controller.
6. parallel great power Switching Power Supply as claimed in claim 3, it is characterized in that, described power control unit also comprises converting unit; The input end of described converting unit is connected with described analog quantity processing unit, for receiving the current feedback values through described analog quantity processing unit processes; The output terminal of described converting unit is connected with the input end of described system feedback unit.
7. parallel great power Switching Power Supply as claimed in claim 3, it is characterized in that, described power cell also comprises inverter current feedback circuit, inverter current in described main loop unit is fed back to analog quantity processing unit by described inverter current feedback circuit, after analog quantity processing unit processes, be sent to described pulse width regulator.
8. parallel great power Switching Power Supply as claimed in claim 3, it is characterized in that, institute's power control unit also comprises digital quantity processing unit, the input end of described digital quantity processing unit is connected with described system control unit, its start stop signal, synchronizing signal of sending for receiving system control module, described digital quantity processing unit is sent to logic controller after above-mentioned signal is carried out digital quantity process.
9. parallel great power Switching Power Supply as claimed in claim 8, it is characterized in that, described driver element also comprises malfunction monitoring unit, the duty of main loop unit described in described malfunction monitoring unit Real-Time Monitoring, and sending fault-signal to described digital quantity processing unit according to monitoring result, described digital quantity processing unit is sent to pulse width regulator after fault-signal is carried out digital quantity process.
10. parallel great power Switching Power Supply as claimed in claim 1, it is characterized in that, described system feedback unit comprises shunt feedback unit or Hall feedback unit, described shunt feedback unit or Hall feedback unit are connected with total output loop of each power cell, for gathering the total current value that each power cell exports.
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