CN106452073A - Energy control circuit for DC-DC power converter and control method thereof - Google Patents
Energy control circuit for DC-DC power converter and control method thereof Download PDFInfo
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- CN106452073A CN106452073A CN201611025474.7A CN201611025474A CN106452073A CN 106452073 A CN106452073 A CN 106452073A CN 201611025474 A CN201611025474 A CN 201611025474A CN 106452073 A CN106452073 A CN 106452073A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Dc-Dc Converters (AREA)
Abstract
The invention belongs to the field of control of DC-DC power converters, and particularly relates to an energy control circuit for a DC-DC power converter and a control method for controlling the circuit by taking whether actual output energy of the circuit is equal to expected energy required by a circuit load or not as a criterion. The energy control circuit consists of a DC-DC converter main circuit, an input energy detection circuit, an output energy detection circuit, an energy analysis circuit, a pulse width modulation signal generation circuit and a logical driving circuit, wherein an input filter capacitor C1, a power electronic device K1, a flywheel diode D1, a filter inductor L1 and an output filter capacitor C2 form the DC-DC power converter main circuit. According to the energy control circuit and the control method thereof, the switching state of the power electronic device in the main circuit is further controlled by taking whether energy output by the DC-DC converter meets a requirement of a load or not as a criterion, so that the phenomenon of dynamic overshooting of output current can be effectively inhibited, and the phenomenon of dynamic overshooting of output voltage can be effectively inhibited.
Description
Technical field
The invention belongs to the control field of DC-DC power converter is and in particular to a kind of reality output energy with circuit
Whether equal with the expectation energy needed for circuit load for criterion, and then the DC-DC power converter energy that circuit is controlled
Amount control circuit and its control method.
Background technology
In DC-DC converter, (in following word, involved DC-DC converter, refers both to utilize electronic power switch
The DC-DC converter of transformation of electrical energy realized by device) controller design in, most commonly seen with hystersis controller and PID controller.
System response time is fast, robustness is good due to having for Hysteresis control, and controller architecture is simple, wide the advantages of be easily achieved
General employing.But when being controlled to the output voltage of DC-DC converter using voltage hysteresis controller, often occur defeated
Go out that current fluctuation is excessive, or even current maxima exceedes the situation of permissible value；And adopt current hysteresis-band control device that DC-DC is converted
When the output current of device is controlled, output voltage uncontrollable situation occurs again.When adopting Hysteresis control in addition, converter
The switching frequency of middle power electronic devices always in change, increased the complexity of output filter circuit parameter designing.And it is traditional
PID controller is although steady-state behaviour is good, but there is the phenomenons such as overshoot, vibration in Dynamic Regulating Process, particularly works as load
During change, problems are more prominent, cause the output quality of power supply to be deteriorated.
Content of the invention
Present invention aims to the deficiency of existing hystersis controller and PID controller, provide one kind to export energy
Measure the energy controller for control targe and its control method, on the premise of realizing to DC-DC converter effective control, can solve
The certainly DC-DC power converter energy steering circuit of the defect of existing hystersis controller and PID controller.
The present invention also aims to providing a kind of DC-DC power converter energy steering circuit control method.
The object of the present invention is achieved like this：
A kind of DC-DC power converter energy steering circuit, by DC-DC converter main circuit, input energy testing circuit,
Output energy detection circuit, energy spectrometer circuit, pulse-width signal generative circuit and logic drive circuit composition, input filter
Electric capacity C1, power electronic devices K1, sustained diode 1, filter inductance L1, output filter capacitor C2 constitute DC-DC converter master
Circuit；The input A of input energy testing circuit and input B connects with the positive and negative electrode of external power source respectively, and input energy is examined
Output end C of slowdown monitoring circuit and output end D are connected with the input positive and negative electrode of BUCK circuit respectively, are simultaneously entered energy detection circuit
W1 is connected with energy spectrometer circuit by data/address bus；The input E and input F of output energy detection circuit are respectively and BUCK
The output positive and negative electrode of circuit connects, and output end G of output energy detection circuit and output end H connect with the positive and negative electrode of load respectively
Connect, output energy detection circuit is connected with energy spectrometer circuit by data/address bus simultaneously；Pulse-width signal generative circuit
Pulse-width signal output end and being connected with a digital quantity signal input part of logic drive circuit, also and energy spectrometer simultaneously
The digital quantity signal input of circuit connects；Another digital quantity signal input and energy spectrometer electricity with logic drive circuit
The digital output signal end on road connects, with the power electronics in the drive signal output end and BUCK circuit of logic drive circuit
The drive end of device connects；
The constant pwm signal of pulse-width signal generative circuit output switch frequency-invariant, dutycycle, pwm signal duty
The size of ratio guarantees when to control BUCK circuit using this pwm signal, and its open loop output voltage value or current value have to be larger than
Output voltage values required for load or current value；Pwm signal switching frequency selection with the operating frequency of power electronic devices,
The parameter of DC-DC converter main circuit output filter is according to determining；
The energy that input energy testing circuit is supplied to BUCK circuit to external power source detects, and testing result is led to
Cross data/address bus and be sent to energy spectrometer circuit Y1 in real time, the energy measuring frequency data of input energy testing circuit W1 sends
Frequency is equal, and energy measuring frequency data transmission frequency is not less than the frequency of 5 times of pwm signal；
Output energy detection circuit detects to the output voltage of BUCK circuit, output current and output energy, and will
Testing result is sent to energy spectrometer circuit in real time by data/address bus, and output energy detection circuit is to output voltage, output electricity
The detection frequency data transmission frequency flowing, exporting energy is equal, and the energy measuring frequency with input energy testing circuit W1
Value is equal；
The pwm signal that energy spectrometer circuit exports to pulse-width signal generative circuit captures, and judges level
The change moment, i.e. the rising edge of level and the trailing edge generation moment, and define the initial time of switch periods；Real-time reception is defeated
Enter the energy detection results that energy detection circuit is sended over by data/address bus, calculate in previous switch periods, that is, from
To within the time period of previous switch periods end time, external power source is supplied to BUCK electricity to previous switch periods initial time
The energy W on roadinq；The energy detection results that real-time reception input energy testing circuit is sended over by data/address bus, count in real time
Calculate in current switch period, in the time period from current switch period initial time to current time, external power source is supplied to
The energy W of BUCK circuitind；Real-time reception exports the energy detection results that energy detection circuit is sended over by data/address bus,
Calculate in previous switch periods, that is, from previous switch periods initial time to previous switch periods end time when
Between in section, BUCK circuit is supplied to the energy W of loadoutq；Calculate in previous switch periods, the efficiency eta of BUCK circuit；
Real-time reception exports output voltage, the output electric current measure that energy detection circuit W2 is sended over by data/address bus
As a result, when the control targe of BUCK circuit exports for constant voltage, energy spectrometer circuit Y1 predicts in current complete opening
In the cycle of pass, that is, from current switch period initial time to the time period of current switch period end time in, BUCK circuit need
The energy W of load to be supplied toouty；When the control targe of BUCK circuit is constant current output, energy spectrometer circuit predicts Wouty's
Size；
In formula, UrefSet-point for BUCK circuit output voltage；
UoutdThe output voltage values being most recently detected for energy detection circuit W2；
IoutdThe output current value being most recently detected for energy detection circuit W2；
RL=Uoutd/IoutdLoad equivalent resistance value for BUCK circuit；
TSSwitch periods for the pwm signal of pulse-width signal generative circuit P1 output；
In formula
IrefSet-point for BUCK circuit output current；
Calculate the size of energy criterion Δ W
Δ W=Windη-Wouty
If Δ W ＜ 0, digital output signal EN is put 1 by energy spectrometer circuit Y1；If Δ W >=0, energy spectrometer
Digital output signal EN is set to 0 by circuit Y1；In the initial time of each pwm signal switch periods, digital output is believed
Number EN puts 1；
The pwm signal of input and EN signal are carried out and logical operation by logic drive circuit, and the output after computing is believed
Number carry out electrical isolation and power amplification is processed, enable to meet the demand driving power electronic devices.
A kind of DC-DC power converter energy steering circuit control method, comprises the steps：
(1), successively after upper electricity, BUCK circuit is started working, and pulse-width signal generative circuit is defeated for control circuit and main circuit
Go out constant frequency perseverance dutycycle pwm signal；
(2) energy spectrometer circuit capture pwm signal, defines switch periods initial time；
(3) if current time is switch periods initial time, EN is put 1, otherwise direct execution step (4)；
(4) if EN=1, execute (5), otherwise execute (9)；
(5) input energy testing circuit detection input energy, testing result sends to energy spectrometer circuit；
(6) output energy detection circuit detection output voltage, output current and output energy, testing result sends to energy
Analysis circuit；
(7) data that energy spectrometer circuit receives input energy detection circuit sends with output energy detection circuit, meter
Calculate Δ W；
(8) if Δ W >=0, EN is set to 0；If Δ W ＜ 0, EN keep constant；
(9) with logic drive circuit, the pwm signal of EN and the output of pulse-width signal generative circuit is carried out and computing, fortune
Calculate result to be used for driving power electronic devices after power amplification, thus controlling BUCK circuit to work；
(10) if shutting down, executing (11), otherwise executing (3)；
(11) main circuit power and control circuit power supply are successively disconnected, BUCK circuit quits work.
The beneficial effects of the present invention is：
DC-DC converter energy steering circuit proposed by the invention and its control method and existing voltage or current hysteresis
Ring controller is compared, and has advantages below：(1) energy steering circuit and its control method are with the energy of DC-DC converter output
Amount whether meet load demand be criterion, and then control main circuit in power electronic devices on off state, therefore with
Output voltage is in the control process of control targe, can effectively restrain the dynamic overshooting phenomenon of output current, and with defeated
Go out electric current be control targe control process in can, can effectively restrain the dynamic overshooting phenomenon of output voltage.(2) pulsewidth
Modulated signal generative circuit P1 output is the pwm signal that switching frequency is constant, dutycycle is constant, and this pwm signal and energy divide
The digital output signal EN of analysis circuit Y1, together after processing with logic drive circuit A1, generates the drive of power electronic devices
Dynamic signal, digital output signal EN is 1 or changes the dutycycle of drive signal for 0 meeting in current switch periods,
The switching frequency (i.e. the switching frequency of power electronic devices) of drive signal is identical with the frequency of pwm signal all the time, and for fixing
Value, therefore can greatly simplify the parameter designing of DC-DC converter median filter.
Brief description
The DC-DC converter energy steering circuit structure chart that Fig. 1 realizes taking BUCK circuit as a example；
The DC-DC converter energy control method control flow chart that Fig. 2 realizes taking BUCK circuit as a example.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described further.
The main circuit topology form species of DC-DC converter is various, in order to make it easy to understand, the present invention is with the main electricity of BUCK type
To be specifically described as a example line structure and to illustrate.
DC-DC converter energy steering circuit proposed by the invention, in addition to DC-DC converter main circuit, mainly by defeated
Enter energy detection circuit W1, output energy detection circuit W2, energy spectrometer circuit Y1, pulse-width signal generative circuit P1 and
The part such as logic drive circuit A1 forms.
Taking the DC-DC converter of BUCK type as a example, during using energy steering circuit proposed by the invention, circuit structure is such as
Shown in Fig. 1, the annexation of circuit is：Input filter capacitor C1, power electronic devices K1, sustained diode 1, filter inductance
L1, output filter capacitor C2 constitute the DC-DC converter main circuit of BUCK type, the annexation between these devices with existing
The annexation of BUCK type circuit is identical；The input A of input energy testing circuit W1 and input B respectively with external power source
Positive and negative electrode connects, and output end C of input energy testing circuit W1 and output end D are connected with the input positive and negative electrode of BUCK circuit respectively
Connect, be simultaneously entered energy detection circuit W1 and be connected with energy spectrometer circuit Y1 by data/address bus；Output energy detection circuit W2
Input E and input F connect with the output positive and negative electrode of BUCK circuit respectively, output end G of output energy detection circuit W2
Connect with the positive and negative electrode of load respectively with output end H, output energy detection circuit W2 passes through data/address bus and energy spectrometer simultaneously
Circuit Y1 connects；PWM (pulsewidth modulation) signal output part of pulse-width signal generative circuit P1 and with logic drive circuit A1
Digital quantity signal input part connect, also connect with the digital quantity signal input of energy spectrometer circuit Y1 simultaneously；With patrol
Digital output signal (EN) end of another digital quantity signal input and energy spectrometer circuit Y1 of collecting drive circuit A1 connects
Connect, be connected with the drive end of power electronic devices K1 in BUCK circuit with the drive signal output end of logic drive circuit A1.
The function of pulse-width signal generative circuit P1 is the constant pwm signal of output switch frequency-invariant, dutycycle,
The size of pwm signal dutycycle should ensure that when to control BUCK circuit using this pwm signal, its open loop output voltage value
(or current value) have to be larger than the output voltage values (or current value) required for load.The selection of pwm signal switching frequency should be with
The operating frequency of power electronic devices K1, the DC-DC converter main circuit output filter (filter inductance in such as BUCK circuit
L1 and output filter capacitor C2) parameter designing be according to determining.
The function of input energy testing circuit W1 is that the energy that external power source is supplied to BUCK circuit detects, and will
Testing result is sent to energy spectrometer circuit Y1 in real time by data/address bus, in order to improve the control effect of energy steering circuit,
Require input energy testing circuit W1 energy measuring frequency data transmission frequency equal, and frequency the higher the better it is contemplated that
The restriction of practical application, energy measuring frequency data transmission frequency should be not less than 5 times of pwm signal (i.e. pulse-width signal
The output of generative circuit P1) frequency.On the premise of ignoring energy loss produced by testing circuit itself, input energy is examined
Slowdown monitoring circuit W1 does not change external power source and is supplied to the parameters such as the amplitude of voltage and current of BUCK circuit, waveform.
The function of output energy detection circuit W2 is that the output voltage to BUCK circuit, output current and output energy are carried out
Detection, and testing result is sent to energy spectrometer circuit Y1 in real time by data/address bus it is desirable to export energy detection circuit W2
To output voltage, output current, output energy detection frequency data transmission frequency equal, and with input energy testing circuit
The energy measuring frequency values of W1 are equal.On the premise of ignoring energy loss produced by testing circuit itself, output energy inspection
Slowdown monitoring circuit W2 does not change the parameters such as the amplitude of BUCK circuit output voltage and output current, waveform.
The function of energy spectrometer circuit Y1 mainly include following some：
Function one：The pwm signal of pulse-width signal generative circuit P1 output is captured, judges the change of level
Moment, i.e. the rising edge of level and the trailing edge generation moment, and define the initial time of switch periods, for example can define every
The rising edge (or trailing edge) of one level is the initial time of corresponding switch periods, then adjacent two rising edges (or
Trailing edge) between time interval be switch periods；
Function two：The energy detection results that real-time reception input energy testing circuit W1 is sended over by data/address bus,
Calculate in previous switch periods, that is, from previous switch periods initial time to previous switch periods end time when
Between in section, external power source is supplied to the energy W of BUCK circuitinq；
Function three：The energy detection results that real-time reception input energy testing circuit W1 is sended over by data/address bus,
Calculate in real time in current switch period, in the time period from current switch period initial time to current time, external power source
It is supplied to the energy W of BUCK circuitind；
Function four：Real-time reception exports the energy detection results that energy detection circuit W2 is sended over by data/address bus,
Calculate in previous switch periods, that is, from previous switch periods initial time to previous switch periods end time when
Between in section, BUCK circuit is supplied to the energy W of loadoutq；
Function five：Calculate in previous switch periods using formula (1), the efficiency eta of BUCK circuit；
Function six：Real-time reception exports output voltage, the output that energy detection circuit W2 is sended over by data/address bus
Current detecting result, when the control targe of BUCK circuit exports for constant voltage, energy spectrometer circuit Y1 utilizes formula (2) prediction to exist
In current complete switch periods, that is, from current switch period initial time to current switch period end time when
Between in section, BUCK circuit is provided to the energy W loadingouty.When the control targe of BUCK circuit is constant current output, energy
Analysis circuit Y1 utilizes formula (3) to predict WoutySize；
In formula
UrefThe set-point (desired constant voltage values) of BUCK circuit output voltage；
UoutdThe output voltage values that energy detection circuit W2 is most recently detected；
IoutdThe output current value that energy detection circuit W2 is most recently detected；
RL=Uoutd/IoutdThe load equivalent resistance value of BUCK circuit；
TSThe switch periods of the pwm signal of pulse-width signal generative circuit P1 output.
In formula
IrefThe set-point (desired constant current value) of BUCK circuit output current.
Function seven：Calculate the size of energy criterion Δ W according to formula (4)
Δ W=Windη-Wouty(4)
If Δ W ＜ 0, digital output signal EN is put 1 (it is assumed that PWM in patent of the present invention by energy spectrometer circuit Y1
Signal be high level effectively, be the situation of Low level effective for pwm signal, according to existing knowledge, can implement
Boolean complementation circuit is added) in circuit.If Δ W >=0, digital output signal EN is set to 0 by energy spectrometer circuit Y1；
Function eight：In the initial time of each pwm signal switch periods, digital output signal EN is put 1.
Function with logic drive circuit A1 is to carry out and logical operation the pwm signal of input and EN signal, and will transport
Output signal after calculation carries out electrical isolation and power amplification is processed, and enables to meet the need driving power electronic devices K1
Ask.
Using the BUCK circuit of energy steering circuit proposed by the invention and its control method, the following institute of its operation principle
State：
After BUCK circuit and control circuit switch on power, pulse-width signal generative circuit P1 output switch frequency is permanent
Pwm signal fixed, that dutycycle is constant；The pwm signal that energy spectrometer circuit Y1 exports to pulse-width signal generative circuit P1 enters
Row capture, and define the initial time of switch periods, in the initial time of each pwm signal switch periods, by digital quantity
Output signal EN puts 1；When digital output signal EN be 1 when, pwm signal through with logic drive circuit A1 after, it is possible to achieve
Driving to power electronic devices K1, and then make BUCK circuit in running order；Input energy testing circuit W1 is to external electrical
The energy that source is supplied to BUCK circuit is detected, and testing result is sent to energy spectrometer circuit in real time by data/address bus
Y1；Output energy detection circuit W2 detects to the output voltage of BUCK circuit, output current and output energy, and will detect
Result is sent to energy spectrometer circuit Y1 in real time by data/address bus；The input energy that energy spectrometer circuit Y1 arrives according to real-time reception
The detection data that amount testing circuit W1 and output energy detection circuit W2 is sended over by data/address bus, comprehensively utilizes formula
(1), (2), (4) (situation when exporting for constant voltage for the control targe of DC-DC converter), or comprehensive utilization formula (1),
(3), (4) (control targe for DC-DC converter is situation during constant current output) calculates the size of energy criterion Δ W, such as
Fruit Δ W ＜ 0, illustrates that the energy providing in current switch period inside and outside power supply is less than and loads required energy, energy spectrometer
It is 1 that circuit Y1 will maintain digital output signal EN, then pwm signal still can be by realizing to electricity with logic drive circuit A1
The driving of power electronic device K1, external power source continues to BUCK circuit input energy, and energy spectrometer circuit Y1 continues with up-to-date
The detection data receiving calculates the size of energy criterion Δ W, if Δ W >=0, illustrates in current switch period inside and outside power supply
The energy being provided can meet the demand to energy for the load, and digital output signal EN is set to 0, that is, by energy spectrometer circuit Y1
By pwm signal being blocked so that power electronic devices K1 is in cut-off state with logic drive circuit A1, energy spectrometer afterwards
Circuit Y1 no longer calculates the size of energy criterion Δ W, can maintain the state that digital output signal EN is 0 always, until next
The arrival of the initial time of individual pwm signal switch periods.Above procedure is repeated, and both can realize the control to BUCK circuit
System is so as to output voltage values during steady-state operation or current value are equal to set-point.
Energy steering circuit proposed by the invention and its control method, are applicable not only to BUCK circuit and its topology knot
Structure is the DC-DC converter of main circuit, can equally be well applied to the DC-DC converter of common other forms.For some structures
Special DC-DC converter, needs the concrete operating principle according to circuit, to involved in formula (1) to formula (4)
Wind、WoutyChanged accordingly etc. the computational methods of energy variable, but control circuit and control principle need not be changed.
Control flow
Control flow chart during BUCK circuit is applied to using energy control method proposed by the invention as shown in Fig. 2
Control flow is as described below：
(1), successively after upper electricity, BUCK circuit is started working, pulse-width signal generative circuit P1 for control circuit and main circuit
Output constant frequency perseverance dutycycle pwm signal.
(2) energy spectrometer circuit Y1 capture pwm signal, defining switch periods initial time (can be according to actual condition
Demand is being specifically defined).
(3) if current time is switch periods initial time, EN is put 1, otherwise directly execute (4).
(4) if EN=1, execute (5), otherwise execute (9).
(5) input energy testing circuit W1 detection input energy, testing result sends to energy spectrometer circuit Y1.
(6) output energy detection circuit W2 detection output voltage, output current and output energy, testing result sends to energy
Amount analysis circuit Y1.
(7) number that energy spectrometer circuit Y1 receives input energy detection circuit W1 and output energy detection circuit W2 sends
According to calculating Δ W.
(8) if Δ W >=0, EN is set to 0；If Δ W ＜ 0, EN keep constant.
(9) with logic drive circuit A1, the pwm signal of EN and pulse-width signal generative circuit P1 output is carried out and fortune
Calculate, operation result is used for driving power electronic devices K1 after power amplification, thus controlling BUCK circuit to work.
(10) if shutting down, executing (11), otherwise executing (3).
(11) main circuit power and control circuit power supply are successively disconnected, BUCK circuit quits work.
Implementation one
Input filter capacitor C1, power electronic devices K1, sustained diode 1, filter inductance L1, output filter capacitor C2
Constitute the DC-DC converter main circuit of BUCK type, the type selecting of these devices and parameter calculate and existing BUCK type circuit
Parts selection and parameter calculating are completely the same.If the DC-DC converter of other forms, then its main circuit parts selection and ginseng
Number calculates also completely the same with existing this kind of DC-DC converter main circuit parts selection and calculation method of parameters.
Input energy testing circuit W1 can be had and can be carried out real-time detection and real-time data communication to energy using existing
The circuit of function to realize, for example, can pass through the voltage and current sensor of Hall type to DC-DC converter using single-chip microcomputer
Input voltage and electric current be acquired, and by the integration to the time is done to the product of the magnitude of voltage collecting and current value
Computing, you can calculate the input energy of DC-DC converter in certain time, and result of calculation is passed through the communication such as parallel bus
Mode is sent to other circuit.
Output energy detection circuit W2 can be had and can be carried out real-time detection and reality to voltage, electric current, energy using existing
When data communication facility circuit realizing, for example can pass through the voltage and current sensor pair of Hall type using single-chip microcomputer
The output voltage of DC-DC converter and electric current are acquired, and pass through the product of the magnitude of voltage collecting and current value is done
Integral operation to the time, you can calculate the output energy of DC-DC converter in certain time, and by the voltage collecting
Value, current value and the output energy value calculating are sent to other circuit by communication modes such as parallel bus.
Energy spectrometer circuit Y1 can have data communication, data calculating analysis, digital quantity input and output using existing
To realize etc. the circuit of function, for example, corresponding peripheral circuit can be aided with using digital signal processor (DSP) or single-chip microcomputer
Form.
Pulse-width signal generative circuit P1 can be using existing various pulse-width signal generative circuits it is also possible to utilize
There is the digital signal processor (DSP) of PWM output function or single-chip microcomputer to realize.
Can adopt the existing various circuit (or chip) being capable of with logical operation with logic drive circuit A1
The mode being combined together with the drive circuit of power electronic devices is realizing.
Data/address bus between input energy testing circuit W1 and energy spectrometer circuit Y1 can adopt existing various data
Bus, such as parallel data bus line, serial data bus or CAN etc..
Data/address bus between output energy detection circuit W2 and energy spectrometer circuit Y1 can adopt existing various data
Bus, such as parallel data bus line, serial data bus or CAN etc..
Claims (2)
1. a kind of DC-DC power converter energy steering circuit, by DC-DC converter main circuit, input energy testing circuit, defeated
Go out energy detection circuit, energy spectrometer circuit, pulse-width signal generative circuit and logic drive circuit composition, its feature exists
In：Input filter capacitor (C1), power electronic devices (K1), fly-wheel diode (D1), filter inductance (L1), output filter capacitor
(C2) constitute DC-DC converter main circuit；The input A of input energy testing circuit and input B respectively with external power source
Positive and negative electrode connects, and output end C of input energy testing circuit and output end D are connected with the input positive and negative electrode of BUCK circuit respectively
Connect, be simultaneously entered energy detection circuit W1 and be connected with energy spectrometer circuit by data/address bus；Export the defeated of energy detection circuit
Enter to hold E and input F to connect with the output positive and negative electrode of BUCK circuit respectively, export output end G and the output of energy detection circuit
End H connects with the positive and negative electrode of load respectively, and output energy detection circuit passes through data/address bus with energy spectrometer circuit even simultaneously
Connect；The pulse-width signal output end of pulse-width signal generative circuit and defeated with a digital quantity signal of logic drive circuit
Enter end to connect, also connect with the digital quantity signal input of energy spectrometer circuit simultaneously；Another number with logic drive circuit
The digital output signal end of word amount signal input part and energy spectrometer circuit connects, defeated with the drive signal of logic drive circuit
Go out end to be connected with the drive end of the power electronic devices in BUCK circuit；
The constant pwm signal of pulse-width signal generative circuit output switch frequency-invariant, dutycycle, pwm signal dutycycle
Size guarantees when to control BUCK circuit using this pwm signal, and its open loop output voltage value or current value have to be larger than load
Required output voltage values or current value；The selection of pwm signal switching frequency is with the operating frequency of power electronic devices, DC-
The parameter of DC inverter main circuit output filter is according to determining；
The energy that input energy testing circuit is supplied to BUCK circuit to external power source detects, and testing result is passed through number
It is sent to energy spectrometer circuit Y1, the energy measuring frequency data transmission frequency of input energy testing circuit W1 according to bus in real time
Equal, energy measuring frequency data transmission frequency is not less than the frequency of 5 times of pwm signal；
Output energy detection circuit detects to the output voltage of BUCK circuit, output current and output energy, and will detect
Result is sent to energy spectrometer circuit in real time by data/address bus, and output energy detection circuit is to output voltage, output current, defeated
The detection frequency data transmission frequency going out energy is equal, and the energy measuring frequency values phase with input energy testing circuit W1
Deng；
The pwm signal that energy spectrometer circuit exports to pulse-width signal generative circuit captures, and judges the change of level
Moment, i.e. the rising edge of level and the trailing edge generation moment, and define the initial time of switch periods；Real-time reception input energy
The energy detection results that amount testing circuit is sended over by data/address bus, calculate in previous switch periods, that is, from previous
To within the time period of previous switch periods end time, external power source is supplied to BUCK circuit to individual switch periods initial time
Energy Winq；The energy detection results that real-time reception input energy testing circuit is sended over by data/address bus, calculate in real time
In current switch period, in the time period from current switch period initial time to current time, external power source is supplied to BUCK
The energy W of circuitind；Real-time reception exports the energy detection results that energy detection circuit is sended over by data/address bus, calculates
Go out in previous switch periods, that is, from previous switch periods initial time to the time period of previous switch periods end time
Interior, BUCK circuit is supplied to the energy W of loadoutq；Calculate in previous switch periods, the efficiency eta of BUCK circuit；
Real-time reception exports output voltage, the output electric current measure knot that energy detection circuit W2 is sended over by data/address bus
Really, when the control targe of BUCK circuit exports for constant voltage, energy spectrometer circuit Y1 predicts in a current complete switch
In cycle, that is, from current switch period initial time to the time period of current switch period end time in, BUCK circuit need
It is supplied to the energy W of loadouty；When the control targe of BUCK circuit is constant current output, energy spectrometer circuit predicts WoutyBig
Little；
In formula
UrefSet-point for BUCK circuit output voltage；
UoutdThe output voltage values being most recently detected for energy detection circuit W2；
IoutdThe output current value being most recently detected for energy detection circuit W2；
RL=Uoutd/IoutdLoad equivalent resistance value for BUCK circuit；
TSSwitch periods for the pwm signal of pulse-width signal generative circuit P1 output；
In formula
IrefSet-point for BUCK circuit output current；
Calculate the size of energy criterion Δ W
Δ W=Windη-Wouty
If Δ W ＜ 0, digital output signal EN is put 1 by energy spectrometer circuit Y1；If Δ W >=0, energy spectrometer circuit
Digital output signal EN is set to 0 by Y1；In the initial time of each pwm signal switch periods, by digital output signal EN
Put 1；
The pwm signal of input and EN signal are carried out and logical operation by logic drive circuit, and the output signal after computing is entered
Row electrical isolation and power amplification are processed, and enable to meet the demand driving power electronic devices.
2. a kind of DC-DC power converter energy steering circuit control method is it is characterised in that comprise the steps：
(1), successively after upper electricity, BUCK circuit is started working, and the output of pulse-width signal generative circuit is permanent for control circuit and main circuit
The permanent dutycycle pwm signal of frequency；
(2) energy spectrometer circuit capture pwm signal, defines switch periods initial time；
(3) if current time is switch periods initial time, EN is put 1, otherwise direct execution step (4)；
(4) if EN=1, execute (5), otherwise execute (9)；
(5) input energy testing circuit detection input energy, testing result sends to energy spectrometer circuit；
(6) output energy detection circuit detection output voltage, output current and output energy, testing result sends to energy spectrometer
Circuit；
(7) data that energy spectrometer circuit receives input energy detection circuit sends with output energy detection circuit, calculates Δ
W；
(8) if Δ W >=0, EN is set to 0；If Δ W ＜ 0, EN keep constant；
(9) with logic drive circuit, the pwm signal of EN and the output of pulse-width signal generative circuit is carried out and computing, computing is tied
Fruit is used for driving power electronic devices after power amplification, thus controlling BUCK circuit to work；
(10) if shutting down, executing (11), otherwise executing (3)；
(11) main circuit power and control circuit power supply are successively disconnected, BUCK circuit quits work.
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| CN108923705A (en) * | 2018-07-13 | 2018-11-30 | 哈尔滨工程大学 | A kind of DC motor drive of energy hole |
| CN109067175A (en) * | 2018-07-13 | 2018-12-21 | 哈尔滨工程大学 | A kind of DC power supply of energy closed-loop control |
| CN109687736A (en) * | 2018-12-24 | 2019-04-26 | 哈尔滨工程大学 | A kind of active power factor correction DC power supply circuit and circuit methods |
| CN110350780A (en) * | 2019-07-04 | 2019-10-18 | 哈尔滨工程大学 | A kind of direct current boosting power based on energy hole |
| CN110707920A (en) * | 2019-11-29 | 2020-01-17 | 广东美的制冷设备有限公司 | Drive control circuit, method and device, air conditioning equipment and readable storage medium |
| CN110868059A (en) * | 2019-11-29 | 2020-03-06 | 广东美的制冷设备有限公司 | Drive control circuit, control method, control device and air conditioning equipment |
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| CN101505098A (en) * | 2008-12-31 | 2009-08-12 | 西南交通大学 | Multi-stage pulse sequence control method of pseudo-continuous working mode and apparatus thereof |
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| CN108923705A (en) * | 2018-07-13 | 2018-11-30 | 哈尔滨工程大学 | A kind of DC motor drive of energy hole |
| CN109067175A (en) * | 2018-07-13 | 2018-12-21 | 哈尔滨工程大学 | A kind of DC power supply of energy closed-loop control |
| CN108923705B (en) * | 2018-07-13 | 2021-06-18 | 哈尔滨工程大学 | Energy-controlled direct-current motor speed regulating device |
| CN109687736A (en) * | 2018-12-24 | 2019-04-26 | 哈尔滨工程大学 | A kind of active power factor correction DC power supply circuit and circuit methods |
| CN109687736B (en) * | 2018-12-24 | 2020-07-14 | 哈尔滨工程大学 | Active power factor correction direct-current power supply circuit and circuit method |
| CN110350780A (en) * | 2019-07-04 | 2019-10-18 | 哈尔滨工程大学 | A kind of direct current boosting power based on energy hole |
| CN110868058A (en) * | 2019-11-29 | 2020-03-06 | 广东美的制冷设备有限公司 | Drive control circuit, method and device, air conditioning equipment and readable storage medium |
| CN110868059A (en) * | 2019-11-29 | 2020-03-06 | 广东美的制冷设备有限公司 | Drive control circuit, control method, control device and air conditioning equipment |
| CN110707920A (en) * | 2019-11-29 | 2020-01-17 | 广东美的制冷设备有限公司 | Drive control circuit, method and device, air conditioning equipment and readable storage medium |
| CN113525106A (en) * | 2020-04-13 | 2021-10-22 | 广州汽车集团股份有限公司 | DC/DC converter and control method thereof |
| CN113525106B (en) * | 2020-04-13 | 2023-11-17 | 广州汽车集团股份有限公司 | DC/DC converter and control method thereof |
| CN115826664A (en) * | 2023-02-21 | 2023-03-21 | 苏州浪潮智能科技有限公司 | Voltage regulation circuit, method and device, and server power supply |
| CN115826664B (en) * | 2023-02-21 | 2023-05-12 | 苏州浪潮智能科技有限公司 | Voltage regulation circuit, method and device and server power supply |
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