CN106452073B - A kind of DC-DC power converter energy steering circuit and its control method - Google Patents
A kind of DC-DC power converter energy steering circuit and its control method Download PDFInfo
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- CN106452073B CN106452073B CN201611025474.7A CN201611025474A CN106452073B CN 106452073 B CN106452073 B CN 106452073B CN 201611025474 A CN201611025474 A CN 201611025474A CN 106452073 B CN106452073 B CN 106452073B
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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
Abstract
The invention belongs to the control fields of DC-DC power converter, DC-DC power converter energy steering circuit and its control method whether equal for criterion with expectation energy needed for circuit load more particularly to a kind of reality output energy with circuit, and then that circuit is controlled.The present invention is by DC-DC converter main circuit, input energy detection circuit, output energy detection circuit, energy spectrometer circuit, pulse-width signal generative circuit and logic drive circuit form, and input filter capacitor C1, power electronic devices K1, sustained diode 1, filter inductance L1, output filter capacitor C2 constitute DC-DC converter main circuit.Energy steering circuit of the present invention and its control method are that whether meet the needs of load as criterion using the energy of DC-DC converter output, and then control the switch state of the power electronic devices in main circuit, because can effectively restrain the dynamic overshooting phenomenon of output electric current, the dynamic overshooting phenomenon of output voltage can be effectively restrained.
Description
Technical field
The invention belongs to the control fields of DC-DC power converter, and in particular to a kind of reality output energy with circuit
Whether equal with expectation energy needed for circuit load is criterion, and then to the DC-DC power converter energy that circuit is controlled
Amount control circuit and its control method.
Background technique
In DC-DC converter, (involved DC-DC converter, refers both to utilize electronic power switch in following text
Device realization transformation of electrical energy DC-DC converter) controller design in, it is most commonly seen with hystersis controller and PID controller.
Hysteresis control is due to having many advantages, such as that system response time is fast, robustness is good, and controller architecture is simple, is easily achieved and wide
General use.But when being controlled using voltage hysteresis controller the output voltage of DC-DC converter, often it will appear defeated
The case where current fluctuation is excessive out or even current maxima is more than permissible value；And current hysteresis-band control device is used to convert DC-DC
When the output electric current of device is controlled, and it will appear the uncontrollable situation of output voltage.When furthermore using Hysteresis control, converter
The switching frequency of middle power electronic devices is always changing, and increases the complexity of output filter circuit parameter designing.And it is traditional
PID controller, although steady-state performance is good, in Dynamic Regulating Process there are overshoot, oscillation phenomena such as, especially work as load
When variation, problems are more prominent, cause to export power quality variation.
Summary of the invention
It is an object of the invention to be directed to the deficiency of existing hystersis controller and PID controller, one kind is provided to export energy
Amount can solve under the premise of realization effectively controls DC-DC converter for the energy controller and its control method of control target
The DC-DC power converter energy steering circuit of the defect of certainly existing hystersis controller and PID controller.
The object of the invention is also to provide a kind of DC-DC power converter energy steering circuit control methods.
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 detection circuit,
It exports energy detection circuit, energy spectrometer circuit, pulse-width signal generative circuit and logic drive circuit to form, input filter
Capacitor C1, power electronic devices K1, sustained diode 1, filter inductance L1, output filter capacitor C2 constitute DC-DC converter master
Circuit；The input terminal A and input terminal B of input energy detection circuit are connected with the positive and negative electrode of external power supply respectively, input energy inspection
The output end C and output end D of slowdown monitoring circuit are connect with the input positive and negative electrode of BUCK circuit respectively, while input energy detection circuit
W1 passes through data/address bus and energy spectrometer circuit connection；Export the input terminal E and input terminal F of energy detection circuit respectively and BUCK
The output positive and negative electrode of circuit connects, and the output end G and output end H for exporting energy detection circuit connect with the positive and negative electrode of load respectively
It connects, while exporting energy detection circuit and passing through data/address bus and energy spectrometer circuit connection；Pulse-width signal generative circuit
It pulse-width signal output end and is connect with a digital quantity signal input part of logic drive circuit, while also and energy spectrometer
The digital quantity signal input terminal of circuit connects；With another digital quantity signal input terminal and energy spectrometer electricity of logic drive circuit
The digital output signal end on road connects, with the power electronics in the driving signal output end and BUCK circuit of logic drive circuit
The driving end of device connects；
The pulse-width signal generative circuit output pwm signal that switching frequency is constant, duty ratio is constant, pwm signal duty
The size of ratio ensures that, when controlling BUCK circuit using the pwm signal, open loop output voltage value or current value have to be larger than
Output voltage values required for loading or current value；The selection of pwm signal switching frequency with the working frequency of power electronic devices,
The parameter of DC-DC converter main circuit output filter is foundation to determine；
The energy that input energy detection circuit is supplied to BUCK circuit to external power supply detects, and it is logical to will test result
It crosses data/address bus and is sent to energy spectrometer circuit Y1 in real time, the energy measuring frequency and data of input energy detection circuit W1 is sent
Frequency is equal, the frequency of the pwm signal of energy measuring frequency and data transmission frequency not less than 5 times；
Output energy detection circuit detects the output voltage of BUCK circuit, output electric current and output energy, and will
Testing result is sent to energy spectrometer circuit by data/address bus in real time, and output energy detection circuit is to output voltage, output electricity
Stream, the detection frequency of output energy and data transmission frequency are equal, and the energy measuring frequency with input energy detection circuit W1
It is worth equal；
The pwm signal that energy spectrometer circuit exports pulse-width signal generative circuit captures, and judges level
Change the moment, i.e., the moment occurs for the rising edge of level and failing edge, and defines 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, i.e., from
In previous switch periods initial time to the period of previous switch periods end time, external power supply is supplied to BUCK electricity
The energy W on roadinq；The energy detection results that real-time reception input energy detection circuit is sended over by data/address bus are counted in real time
It calculates in current switch period, in the period from current switch period initial time to current time, external power supply is supplied to
The energy W of BUCK circuitind；The energy detection results that real-time reception output energy detection circuit is sended over by data/address bus,
Calculate in previous switch periods, i.e., 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；It calculates in previous switch periods, the efficiency eta of BUCK circuit；
Output voltage, the output electric current measure that real-time reception output energy detection circuit W2 is sended over by data/address bus
As a result, energy spectrometer circuit Y1 prediction is completely opened at current one when the control target of BUCK circuit is constant voltage output
Close the period in, i.e., from current switch period initial time to the period of current switch period end time in, BUCK circuit need
It is supplied to the energy W of loadouty；When the control target of BUCK circuit is constant current output, energy spectrometer circuit predicts Wouty's
Size；
In formula, UrefFor the given value of 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/IoutdFor the load equivalent resistance value of BUCK circuit；
TSFor the switch periods of the pwm signal of pulse-width signal generative circuit P1 output；
In formula
IrefFor the given value of 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 set 1 by energy spectrometer circuit Y1；If Δ W >=0, energy spectrometer
Digital output signal EN is set 0 by circuit Y1；In the initial time of each pwm signal switch periods, digital output is believed
Number EN sets 1；
Logic drive circuit is by the pwm signal of input and EN signal carries out and logical operation, and the output after operation is believed
Number carry out electrical isolation and power amplification processing, enable meet the needs of driving power electronic device.
A kind of DC-DC power converter energy steering circuit control method, includes the following steps:
(1) after control circuit and main circuit successively power on, BUCK circuit is started to work, and pulse-width signal generative circuit is defeated
Constant frequency perseverance duty ratio pwm signal out；
(2) energy spectrometer circuit captures pwm signal, defines switch periods initial time；
(3) if current time is switch periods initial time, EN is set 1, otherwise directly executes step (4)；
(4) if EN=1, (5) are executed, otherwise execute (9)；
(5) input energy detection circuit detects input energy, and testing result is sent to energy spectrometer circuit；
(6) output energy detection circuit detection output voltage, output electric current and output energy, testing result are sent to energy
Analyze circuit；
(7) energy spectrometer circuit receives input energy detection circuit and exports the data that energy detection circuit is sent, meter
Calculate Δ W；
(8) if Δ W >=0, EN is set 0；If Δ W < 0, EN is remained unchanged；
(9) and logic drive circuit is carried out to the pwm signal of EN and the output of pulse-width signal generative circuit and operation, fortune
It calculates result and is used for driving power electronic device after power amplification, to control the work of BUCK circuit；
(10) if shutting down, (11) are executed, otherwise execute (3)；
(11) it successively disconnects main circuit power and control circuit power supply, BUCK circuit stops working.
The beneficial effects of the present invention are:
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 the advantage that (1) energy steering circuit and its control method is the energy exported with DC-DC converter
Amount whether meet the needs of load be criterion, and then control main circuit in power electronic devices switch state, therefore with
Output voltage is the dynamic overshooting phenomenon of output electric current can effectively to be restrained, and with defeated in the control process for control target
Out electric current be control target control process in can, can effectively restrain the dynamic overshooting phenomenon of output voltage.(2) pulsewidth
What modulated signal generative circuit P1 was exported is the pwm signal that switching frequency is constant, duty ratio is constant, the pwm signal and energy point
The digital output signal EN of circuit Y1 is analysed together by generating the drive of power electronic devices with after logic drive circuit A1 processing
Signal is moved, digital output signal EN is 1 or is the duty ratio that 0 meeting changes driving signal in current switch periods,
The switching frequency (i.e. the switching frequency of power electronic devices) of driving signal is identical as the frequency of pwm signal always, and to fix
Value, therefore can greatly simplify the parameter designing of filter in DC-DC converter.
Detailed description of the invention
The DC-DC converter energy steering circuit structure chart that Fig. 1 is realized by taking BUCK circuit as an example；
The DC-DC converter energy control method control flow chart that Fig. 2 is realized by taking BUCK circuit as an example.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
The main circuit topology form of DC-DC converter is many kinds of, in order to make it easy to understand, the present invention is with the main electricity of BUCK type
It is specifically described and illustrates for line structure.
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, with
The part such as logic drive circuit A1 forms.
By taking the DC-DC converter of BUCK type as an example, when using energy steering circuit proposed by the invention, circuit structure is such as
Shown in Fig. 1, the connection relationship of circuit are as follows: 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 connection relationship between these devices with it is existing
The connection relationship of BUCK type circuit is identical；The input terminal A and input terminal B of input energy detection circuit W1 respectively with external power supply
Positive and negative electrode connection, the output end C and output end D of input energy detection circuit W1 connect with the input positive and negative electrode of BUCK circuit respectively
It connects, while input energy detection circuit W1 is connect by data/address bus with energy spectrometer circuit Y1；Export energy detection circuit W2
Input terminal E connected respectively with the output positive and negative electrode of BUCK circuit with input terminal F, export energy detection circuit W2 output end G
It is connected respectively with the positive and negative electrode of load with output end H, while exporting energy detection circuit W2 and passing through data/address bus and energy spectrometer
Circuit Y1 connection；PWM (pulsewidth modulation) signal output end of pulse-width signal generative circuit P1 and with logic drive circuit A1
The connection of a digital quantity signal input part, while also being connected with the digital quantity signal input terminal of energy spectrometer circuit Y1；With patrol
The digital output signal (EN) of another digital quantity signal input terminal and energy spectrometer circuit Y1 for collecting driving circuit A1, which is held, to be connected
It connects, is connect with the driving signal output end of logic drive circuit A1 with the driving end of the power electronic devices K1 in BUCK circuit.
The function of pulse-width signal generative circuit P1 is the output pwm signal that switching frequency is constant, duty ratio is constant,
The size of pwm signal duty ratio should ensure that when being controlled BUCK circuit using the pwm signal, open loop output voltage value
(or current value) has to be larger than output voltage values (or current value) required for load.The selection of pwm signal switching frequency should be with
The working frequency of power electronic devices K1, DC-DC converter main circuit output filter (such as the filter inductance in BUCK circuit
L1 and output filter capacitor C2) parameter designing be according to determining.
The function of input energy detection circuit W1 is to be supplied to the energy of BUCK circuit to external power supply to detect, and will
Testing result is sent to energy spectrometer circuit Y1 by data/address bus in real time, in order to improve the control effect of energy steering circuit,
It is required that the energy measuring frequency and data transmission frequency of input energy detection circuit W1 are equal, and the higher the better for frequency, it is contemplated that
The limitation of practical application, energy measuring frequency and 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.Under the premise of ignoring energy loss caused by detection circuit itself, input energy inspection
Slowdown monitoring circuit W1 does not change external power supply and is supplied to the parameters such as amplitude, the waveform of voltage and current of BUCK circuit.
The function of output energy detection circuit W2 is that the output voltage to BUCK circuit, output electric current and output energy carry out
Detection, and will test result and energy spectrometer circuit Y1 is sent to by data/address bus in real time, it is desirable that output energy detection circuit W2
To output voltage, output electric current, export energy detection frequency and data transmission frequency it is equal, and with input energy detection circuit
The energy measuring frequency values of W1 are equal.Under the premise of ignoring energy loss caused by detection circuit itself, output energy inspection
Slowdown monitoring circuit W2 does not change BUCK circuit output voltage and exports the parameters such as amplitude, the waveform of electric current.
The function of energy spectrometer circuit Y1 mainly includes the following:
Function one: the pwm signal of pulse-width signal generative circuit P1 output is captured, judges the variation of level
Moment occurs for moment, the i.e. rising edge of level and failing edge, and defines the initial time of switch periods, such as can define every
The rising edge (or failing edge) of one level be a corresponding switch periods initial time, then two adjacent rising edges (or
Failing edge) between time interval be a switch periods；
Function two: the energy detection results that real-time reception input energy detection circuit W1 is sended over by data/address bus,
Calculate in previous switch periods, i.e., from previous switch periods initial time to previous switch periods end time when
Between in section, external power supply is supplied to the energy W of BUCK circuitinq；
Function three: the energy detection results that real-time reception input energy detection circuit W1 is sended over by data/address bus,
It calculates in current switch period in real time, in the period from current switch period initial time to current time, external power supply
It is supplied to the energy W of BUCK circuitind；
Function four: the energy detection results that real-time reception output energy detection circuit W2 is sended over by data/address bus,
Calculate in previous switch periods, i.e., 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: it is calculated 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
As a result, when the control target of BUCK circuit is constant voltage output, energy spectrometer circuit Y1 is predicted current detecting using formula (2)
In the complete switch periods of current one, i.e., from current switch period initial time to current switch period end time when
Between in section, BUCK circuit is provided to the energy W of loadouty.When the control target of BUCK circuit is constant current output, energy
It analyzes circuit Y1 and predicts W using formula (3)outySize；
In formula
Uref--- the given value (desired constant voltage values) of BUCK circuit output voltage；
Uoutd--- the output voltage values that energy detection circuit W2 is most recently detected；
Ioutd--- the output current value that energy detection circuit W2 is most recently detected；
RL=Uoutd/Ioutd--- the load equivalent resistance value of BUCK circuit；
TS--- the switch periods of the pwm signal of pulse-width signal generative circuit P1 output.
In formula
Iref--- the given value (desired constant current value) of BUCK circuit output current.
Function seven: the size of energy criterion Δ W is calculated according to formula (4)
Δ W=Windη-Wouty (4)
If digital output signal EN is set 1 (in the invention patent, it is assumed that PWM by Δ W < 0, energy spectrometer circuit Y1
Signal is that high level is effective, is that the effective situation of low level can be in specific implementation according to existing knowledge for pwm signal
Boolean complementation circuit is added in circuit).If Δ W >=0, digital output signal EN is set 0 by energy spectrometer circuit Y1；
Function eight: in the initial time of each pwm signal switch periods, digital output signal EN is set 1.
Function with logic drive circuit A1 is the pwm signal that will be inputted and EN signal carries out and logical operation, and will fortune
Output signal after calculation carries out electrical isolation and power amplification processing, enables the need for meeting driving power electronic device K1
It asks.
Using the BUCK circuit of energy steering circuit and its control method proposed by the invention, the following institute of working principle
It states:
After BUCK circuit and control circuit power on, it is permanent that pulse-width signal generative circuit P1 exports switching frequency
Pwm signal fixed, duty ratio is constant；The pwm signal that energy spectrometer circuit Y1 exports pulse-width signal generative circuit P1 into
Row capture, and the initial time of switch periods is defined, in the initial time of each pwm signal switch periods, by digital quantity
Output signal EN sets 1；When digital output signal EN is 1, pwm signal is by may be implemented with after logic drive circuit A1
Driving to power electronic devices K1, and then keep BUCK circuit in running order；W1 is to external electrical for input energy detection circuit
The energy that source is supplied to BUCK circuit is detected, and be will test result and be sent to energy spectrometer circuit in real time by data/address bus
Y1；Output energy detection circuit W2 detects the output voltage of BUCK circuit, output electric current and output energy, and will test
As a result energy spectrometer circuit Y1 is sent to by data/address bus in real time；The input energy that energy spectrometer circuit Y1 is arrived according to real-time reception
The detection data that amount detection circuit W1 and output energy detection circuit W2 are sended over by data/address bus, comprehensively utilizes formula
(1), (2), (4) (the case where when the control target for DC-DC converter is constant voltage output), or comprehensive utilization formula (1),
(3), (4) (the case where when the control target for DC-DC converter is constant current output) calculates the size of energy criterion Δ W, such as
Fruit Δ W < 0 illustrates that the energy provided in current switch period inside and outside power supply is less than and loads required energy, energy spectrometer
It is 1 that circuit Y1, which will maintain digital output signal EN, then pwm signal still can be by realizing with logic drive circuit A1 to electricity
The driving of power electronic device K1, external power supply continue to BUCK circuit input energy, and energy spectrometer circuit Y1 continues with newest
The size that the detection data received calculates energy criterion Δ W illustrates if Δ W >=0 in current switch period inside and outside power supply
Provided energy can satisfy the demand loaded to energy, and digital output signal EN is set to 0 by energy spectrometer circuit Y1, i.e.,
By the way that pwm signal is blocked with logic drive circuit A1, so that power electronic devices K1 is in off state, energy spectrometer later
Circuit Y1 no longer calculates the size of energy criterion Δ W, and can maintain always digital output signal EN is 0 state, until next
The arrival of the initial time of a pwm signal switch periods.Above procedure is repeated, and the control to BUCK circuit both may be implemented
System makes output voltage values or current value when its steady-state operation be equal to given value.
Energy steering circuit and its control method proposed by the invention is 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 certain structures
Special DC-DC converter needs the concrete operating principle according to circuit, involved into formula (4) to formula (1)
Wind、WoutyEtc. the calculation methods of energy variables modified accordingly, but control circuit and control principle are without change.
Control flow
Using energy control method proposed by the invention be applied to BUCK circuit when control flow chart as shown in Fig. 2,
Control flow is as described below:
(1) after control circuit and main circuit successively power on, BUCK circuit is started to work, pulse-width signal generative circuit P1
Export constant frequency perseverance duty ratio pwm signal.
(2) energy spectrometer circuit Y1 captures pwm signal, and defining switch periods initial time (can be according to actual condition
Demand is specifically defined).
(3) if current time is switch periods initial time, EN is set 1, otherwise directly executes (4).
(4) if EN=1, (5) are executed, otherwise execute (9).
(5) input energy detection circuit W1 detects input energy, and testing result is sent to energy spectrometer circuit Y1.
(6) output energy detection circuit W2 detection output voltage, output electric current and output energy, testing result are sent to energy
Amount analysis circuit Y1.
(7) energy spectrometer circuit Y1 receives input energy detection circuit W1 and exports the number that energy detection circuit W2 is sent
According to calculating Δ W.
(8) if Δ W >=0, EN is set 0；If Δ W < 0, EN is remained unchanged.
(9) pwm signal that EN and pulse-width signal generative circuit P1 is exported is carried out and is transported with logic drive circuit A1
It calculates, operation result is used for driving power electronic device K1 after power amplification, to control the work of BUCK circuit.
(10) if shutting down, (11) are executed, otherwise execute (3).
(11) it successively disconnects main circuit power and control circuit power supply, BUCK circuit stops working.
Implementation method one
Input filter capacitor C1, power electronic devices K1, sustained diode 1, filter inductance L1, output filter capacitor C2
The DC-DC converter main circuit of BUCK type is constituted, the type selecting and parameter of these devices calculate and existing BUCK type circuit
Parts selection and parameter calculate completely the same.If it is 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 detection circuit W1 can be used it is existing have energy can be measured in real time and real-time data communication
The circuit of function is realized, such as can use single-chip microcontroller by the voltage and current sensor of Hall type to DC-DC converter
Input voltage and electric current be acquired, and the integral to the time is done by the product to collected voltage value and current value
Operation can calculate the input energy of DC-DC converter in certain time, and calculated result is passed through the communication such as parallel bus
Mode is sent to other circuits.
Output energy detection circuit W2 can be used it is existing have voltage, electric current, energy can be measured in real time and real
When data communication facility circuit realize, such as can use the voltage and current sensor pair that single-chip microcontroller passes through Hall type
The output voltage and electric current of DC-DC converter are acquired, and are done by the product to collected voltage value and current value
Integral operation to the time, can calculate the output energy of DC-DC converter in certain time, and by collected voltage
Value, current value and calculated output energy value are sent to other circuits by communication modes such as parallel bus.
Energy spectrometer circuit Y1 can be used existing with data communication, data calculate analysis, digital quantity is output and input
Etc. the circuits of functions realize, such as digital signal processor (DSP) can be used or single-chip microcontroller is aided with corresponding peripheral circuit
Form.
Existing various pulse-width signal generative circuits can be used in pulse-width signal generative circuit P1, also can use
Digital signal processor (DSP) or single-chip microcontroller with PWM output function are realized.
Can be used with logic drive circuit A1 various can be realized existing and the circuit of logical operation (or chip)
It is realized with the combined mode of driving circuit of power electronic devices.
Existing various data can be used in data/address bus between input energy detection circuit W1 and energy spectrometer circuit Y1
Bus, such as parallel data bus line, serial data bus or CAN bus etc..
Existing various data can be used in data/address bus between output energy detection circuit W2 and energy spectrometer circuit Y1
Bus, such as parallel data bus line, serial data bus or CAN bus etc..
Claims (2)
- It is input energy detection circuit, defeated by DC-DC converter main circuit 1. a kind of DC-DC power converter energy steering circuit Energy detection circuit, energy spectrometer circuit, pulse-width signal generative circuit and logic drive circuit form out, and feature exists In: input filter capacitor (C1), power electronic devices (K1), freewheeling diode (D1), filter inductance (L1), output filter capacitor (C2) DC-DC converter main circuit is constituted；The input terminal A and input terminal B of input energy detection circuit respectively with external power supply Positive and negative electrode connection, output end C and output end the D input with DC-DC converter main circuit respectively of input energy detection circuit Positive and negative electrode connection, while input energy detection circuit W1 passes through data/address bus and energy spectrometer circuit connection；Export energy measuring The input terminal E and input terminal F of circuit are connected with the output positive and negative electrode of DC-DC converter main circuit respectively, output energy measuring electricity The output end G and output end H on road are connected with the positive and negative electrode of load respectively, while being exported energy detection circuit and being passed through data/address bus With energy spectrometer circuit connection；The one of the pulse-width signal output end of pulse-width signal generative circuit and logic drive circuit A digital quantity signal input part connection, while also being connected with the digital quantity signal input terminal of energy spectrometer circuit；Logical drive electricity Another digital quantity signal input terminal on road is connected with the digital output signal end of energy spectrometer circuit, logic drive circuit Driving signal output end is connect with the driving end of the power electronic devices in DC-DC converter main circuit；The pulse-width signal generative circuit output pwm signal that switching frequency is constant, duty ratio is constant, pwm signal duty ratio Size ensures that, when controlling DC-DC converter main circuit using the pwm signal, open loop output voltage value or current value are necessary Greater than output voltage values or current value required for loading；The selection of pwm signal switching frequency is with the work of power electronic devices Frequency, the parameter of DC-DC converter main circuit filter inductance are foundation to determine；The energy that input energy detection circuit is supplied to DC-DC converter main circuit to external power supply detects, and will test As a result energy spectrometer circuit Y1, the energy measuring frequency sum number of input energy detection circuit W1 are sent to by data/address bus in real time According to sending, frequency is equal, the pwm signal switching frequency of energy measuring frequency and data transmission frequency not less than 5 times；Output energy detection circuit detects the output voltage of DC-DC converter main circuit, output electric current and output energy, And will test result and energy spectrometer circuit is sent to by data/address bus in real time, output energy detection circuit is to output voltage, defeated Electric current, the detection frequency of output energy and data transmission frequency are equal out, and the energy measuring with input energy detection circuit W1 Frequency values are equal；The pwm signal that energy spectrometer circuit exports pulse-width signal generative circuit captures, and judges the variation of level Moment occurs for moment, the i.e. rising edge of level and failing edge, and defines the initial time of switch periods；Real-time reception input energy The energy detection results that amount detection circuit is sended over by data/address bus, calculate in previous switch periods, i.e., from previous In a switch periods initial time to the period of previous switch periods end time, external power supply is supplied to DC-DC transformation The energy W of device main circuitinq；The energy detection results that real-time reception input energy detection circuit is sended over by data/address bus, It calculates in current switch period in real time, in the period from current switch period initial time to current time, external power supply It is supplied to the energy W of DC-DC converter main circuitind；Real-time reception output energy detection circuit is sended over by data/address bus Energy detection results, calculate in previous switch periods, i.e., from previous switch periods initial time to previous switch In the period at cycle arrest moment, DC-DC converter main circuit is supplied to the energy W of loadoutq；Calculate previous switch In period, the efficiency eta of DC-DC converter main circuit；Output voltage, the output electric current measure knot that real-time reception output energy detection circuit W2 is sended over by data/address bus Fruit, when the control target of DC-DC converter main circuit is constant voltage output, energy spectrometer circuit Y1 prediction is complete in current one In whole switch periods, i.e., from current switch period initial time to the period of current switch period end time in, DC-DC Inverter main circuit is provided to the energy W of loadouty；When the control target of DC-DC converter main circuit is constant current output When, energy spectrometer circuit predicts WoutySize；In formulaUrefFor the given value of DC-DC converter main 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/IoutdFor the load equivalent resistance value of DC-DC converter main circuit；TSFor the switch periods of the pwm signal of pulse-width signal generative circuit P1 output；OrIn formulaIrefThe given value of electric current is exported for DC-DC converter main circuit；Calculate the size of energy criterion Δ WΔ W=Windη-WoutyIf Δ W < 0, digital output signal EN is set 1 by energy spectrometer circuit Y1；If Δ W >=0, energy spectrometer circuit Digital output signal EN is set 0 by Y1；In the initial time of each pwm signal switch periods, by digital output signal EN Set 1；The pwm signal of input and digital quantity output signal EN are carried out logical operation by logic drive circuit, and will be defeated after operation Signal carries out electrical isolation and power amplification processing out, enables meet the needs of driving power electronic device.
- 2. a kind of DC-DC power converter energy steering circuit control method, which comprises the steps of:(1) after control circuit and DC-DC converter main circuit successively power on, DC-DC converter main circuit is started to work, pulsewidth tune Signal generating circuit processed exports constant frequency perseverance duty ratio pwm signal to DC-DC converter main circuit；(2) energy spectrometer circuit captures pwm signal, defines switch periods initial time；(3) if current time is switch periods initial time, EN is set 1, otherwise directly executes step (4)；(4) if EN=1, (5) are executed, otherwise execute (9)；(5) input energy detection circuit detects input energy, and testing result is sent to energy spectrometer circuit；(6) output energy detection circuit detection output voltage, output electric current and output energy, testing result are sent to energy spectrometer Circuit；(7) energy spectrometer circuit receives input energy detection circuit and exports the data that energy detection circuit is sent, and calculates energy Measure criterion Δ W；Δ W=Windη-Wouty；WoutyThe energy of load is provided to for DC-DC converter main circuit；WindFor outside Power supply is supplied to the energy of DC-DC converter main circuit；η is the efficiency of DC-DC converter main circuit；(8) if Δ W >=0, EN is set 0；If Δ W < 0, digital output signal EN is remained unchanged；(9) pwm signal progress and operation that logic drive circuit exports EN and pulse-width signal generative circuit, operation result Driving power electronic device is used for after power amplification, to control the work of DC-DC converter main circuit；(10) if shutting down, (11) are executed, otherwise execute (3)；(11) DC-DC converter main circuit power and control circuit power supply are successively disconnected, DC-DC converter main circuit stops work Make；The control circuit includes pulse-width signal generative circuit, energy spectrometer circuit, input energy detection circuit, output energy Measure detection circuit and logic drive circuit.
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| CN109067175B (en) * | 2018-07-13 | 2020-12-04 | 哈尔滨工程大学 | Energy closed-loop control direct-current power supply |
| CN108923705B (en) * | 2018-07-13 | 2021-06-18 | 哈尔滨工程大学 | Energy-controlled direct-current motor speed regulating device |
| 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 |
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| 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 |
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| 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 |
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