CN110380619A - A kind of DC converting circuit and its control method, current/direct-current conversion device - Google Patents
A kind of DC converting circuit and its control method, current/direct-current conversion device Download PDFInfo
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- CN110380619A CN110380619A CN201910628877.8A CN201910628877A CN110380619A CN 110380619 A CN110380619 A CN 110380619A CN 201910628877 A CN201910628877 A CN 201910628877A CN 110380619 A CN110380619 A CN 110380619A
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- converting
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Classifications
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of DC converting circuit and its control methods, current/direct-current conversion device, in DC converting circuit of the invention, the output voltage situation of DC-DC converting unit is obtained by voltage feedback circuit to obtain voltage feedback signal, governor circuit exports the changeover control signal of control DC-DC converting unit according to voltage feedback signal, and DC converting circuit at this time is in closed-loop control state；In addition, the output current conditions of current feedback circuit detection DC-DC converting unit are set to obtain current feedback signal, governor circuit controls whether output open-loop control signal according to current feedback signal, in the case of exporting open-loop control signal, open-loop control circuit is according to the Voltage Feedback of open-loop control signal interrupt voltage feed circuit, DC converting circuit at this time is in opened loop control state, and DC converting circuit is worked with maximum conversion efficiency, effectively increases the transfer efficiency of circuit.Current/direct-current conversion device is due to the DC converting circuit with high conversion efficiency, the high conversion efficiency of device.
Description
Technical field
The present invention relates to direct current conversion art, especially a kind of DC converting circuit and its control method, direct current converting means
It sets.
Background technique
DC-DC converter is a kind of electric energy that the electric energy of a voltage value is become to another voltage value in DC circuit
Device, DC/DC converter is divided into three classes: step-up DC/DC converter, voltage-dropping type DC/DC converter and buck-boost type DC/
DC converter, DC-DC converter are widely used in the products such as mobile phone, MP3, digital camera, portable media player.
In known technology, with the development of science and technology, more stringent requirements are proposed to DC/DC converter, performance requirement is past high
The direction of efficiency miniaturization is developed, however, existing DC/DC conversion circuit is unable to satisfy the requirement of high conversion efficiency, therefore, urgently
Improvement need to be made to this technology.
Summary of the invention
The present invention is directed to solve one of the technical problem in related describe at least to a certain extent.For this purpose, of the invention
One purpose is to provide a kind of DC converting circuit and its control method, current/direct-current conversion device, can be improved direct current transfer efficiency.
The technical scheme adopted by the invention is that:
In a first aspect, the present invention provides a kind of DC converting circuit of high conversion efficiency, including direct-flow input end, DC-DC
Converting unit, DC output end, output end for obtaining the DC-DC converting unit voltage feedback signal Voltage Feedback
Circuit, the current feedback circuit of the current feedback signal of output end for obtaining the DC-DC converting unit, opened loop control electricity
Road and governor circuit；The governor circuit is used to control the DC-DC converting unit according to voltage feedback signal output
The changeover control signal of work, the governor circuit are used to control whether output opened loop control letter according to the current feedback signal
Number, the open-loop control circuit is used to interrupt the Voltage Feedback of the voltage feedback circuit according to the open-loop control signal；
The direct-flow input end is connect with the input terminal of the DC-DC converting unit, the output of the DC-DC converting unit
End is connect with the input terminal of the DC output end, the input terminal of the voltage feedback circuit, the current feedback circuit respectively,
The output end of the voltage feedback circuit, the current feedback circuit output end with the input terminal of the governor circuit connect
It connecing, the output end of the governor circuit is connect with the control terminal of the DC-DC converting unit to input the changeover control signal,
The output end of the governor circuit is connect with the input terminal of the open-loop control circuit, the output end of the open-loop control circuit with
The input terminal of the voltage feedback circuit connects.
Further, the DC-DC converting unit includes DC-DC conversion circuit and current rectifying and wave filtering circuit, and the direct current is defeated
Enter end to connect with the input terminal of the DC-DC conversion circuit, the output end of the DC-DC conversion circuit and rectifying and wave-filtering electricity
The input terminal on road connects, the output end of the current rectifying and wave filtering circuit respectively with the DC output end, the voltage feedback circuit
Input terminal, the current feedback circuit input terminal connection, the output end of the governor circuit and the DC-DC conversion circuit
Control terminal connection.
Further, the DC converting circuit further includes LC resonance circuit, and the output end of the DC-DC conversion circuit is logical
The LC resonance circuit is crossed to connect with the input terminal of the current rectifying and wave filtering circuit.
Further, the DC converting circuit further includes the electricity for obtaining the input terminal of the DC-DC conversion circuit
The current detection circuit of feedback signal is flowed, the direct-flow input end passes through the current detection circuit and DC-DC conversion electricity
The input terminal on road connects, and the output end of the current detection circuit is connect with the input terminal of the governor circuit.
Further, the DC-DC conversion circuit includes the first power tube, the second power tube and transformer, the direct current
The negative terminal of input terminal is all connected with the negative output terminal of first power tube, the negative output terminal of second power tube, and described
The control terminal of one power tube, the control terminal of second power tube respectively as the DC-DC conversion circuit control terminal；It is described
The positive output end of first power tube is connect with the first input end of the transformer, the positive output end of second power tube and institute
The second input terminal connection of transformer is stated, the anode of the direct-flow input end is connect with the intermediate input end of the transformer, institute
The output end for stating transformer is connect with the input terminal of the current rectifying and wave filtering circuit.
Further, first power tube and/or second power tube are metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is function
The control terminal of rate pipe, the source electrode of the metal-oxide-semiconductor are the negative output terminal of power tube, and the drain electrode of the metal-oxide-semiconductor is the just defeated of power tube
Outlet.
Further, the current rectifying and wave filtering circuit includes rectifier bridge and filter capacitor, the output of the DC-DC conversion circuit
End is connect with the input terminal of the rectifier bridge, and the output end of the rectifier bridge is connect with the input terminal of the filter capacitor, described
The output end of filter capacitor is electric with the DC output end, the input terminal of the voltage feedback circuit, the current feedback respectively
The input terminal on road connects.
Further, the voltage feedback circuit includes operational amplifier and reference voltage circuit, and the DC-DC conversion is single
The output end of member is connect with the non-inverting input terminal of the operational amplifier, the output end of the reference voltage circuit and the operation
The inverting input terminal of amplifier connects, and the output end of the operational amplifier is connect with the input terminal of the governor circuit.
Further, the open-loop control circuit includes that switching tube and signal for receiving the open-loop control signal are defeated
Enter end, the signal input part is connect with the control terminal of the switching tube, and the positive output end of the switching tube is put with the operation
The non-inverting input terminal connection of big device, the negative output terminal ground connection of the switching tube.
Further, the governor circuit is also used to be controlled according to the current feedback signal and the voltage feedback signal
Whether the open-loop control signal is exported.
Second aspect, the present invention provide a kind of current/direct-current conversion device, and the direct current including the high conversion efficiency converts electricity
Road.
The third aspect, the present invention provide a kind of control method of DC converting circuit, applied to the high conversion efficiency
DC converting circuit, comprising:
Judge whether the DC converting circuit is heavy duty according to the current feedback signal；
If being judged as heavy duty, the governor circuit exports open-loop control signal to the open-loop control circuit；
The open-loop control circuit interrupts the Voltage Feedback of the voltage feedback circuit according to the open-loop control signal；
The governor circuit carries out opened loop control to the DC-DC converting unit.
The beneficial effects of the present invention are:
In DC converting circuit of the invention, the output voltage feelings of DC-DC converting unit are obtained by voltage feedback circuit
For condition to obtain voltage feedback signal, governor circuit exports the conversion and control of control DC-DC converting unit according to voltage feedback signal
Signal, DC converting circuit at this time are in closed-loop control state；In addition, setting current feedback circuit detects DC-DC conversion list
For the output current conditions of member to obtain current feedback signal, governor circuit controls whether output open loop control according to current feedback signal
Signal processed, in the case of exporting open-loop control signal, open-loop control circuit feeds back electricity according to open-loop control signal interrupt voltage
The Voltage Feedback on road, DC converting circuit at this time are in opened loop control state, and DC converting circuit is with maximum conversion efficiency work
Make, improves percentage of circuit utilization, effectively increase the transfer efficiency of circuit；Overcome in known technology there are DC/DC conversion circuit without
Method meets the technical issues of requirement of high conversion efficiency.On the other hand, current/direct-current conversion device is due to the straight of high conversion efficiency
Flow conversion circuit, the high conversion efficiency of device.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of embodiment of the DC converting circuit of high conversion efficiency in the present invention；
Fig. 2 is a kind of circuit of embodiment of direct-flow input end in the present invention, current detection circuit and DC-DC converting unit
Figure；
Fig. 3 is a kind of circuit diagram of embodiment of open-loop control circuit and voltage feedback circuit in the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
Embodiment 1
The structural block diagram of the DC converting circuit of high conversion efficiency, high conversion efficiency are illustrated with reference to Fig. 1, Fig. 1
DC converting circuit include direct-flow input end 1, it is DC-DC converting unit 2, DC output end 3, single for obtaining DC-DC conversion
The electric current of the voltage feedback circuit 7 of the voltage feedback signal of the output end of member 2, output end for obtaining DC-DC converting unit 2
Current feedback circuit 8, open-loop control circuit 6 and the governor circuit 5 of feedback signal；Governor circuit 5 according to Voltage Feedback for believing
Number output control DC-DC converting unit 2 work changeover control signal, governor circuit 5 be used for according to current feedback signal control
Whether system exports open-loop control signal, and open-loop control circuit 6 is used for the electricity according to open-loop control signal interrupt voltage feed circuit 7
Pressure feedback, so that voltage feedback circuit 7 can not carry out Voltage Feedback.
Specifically, direct-flow input end 1 is connect with the input terminal of DC-DC converting unit 2, the output end of DC-DC converting unit 2
It is connect respectively with the input terminal of DC output end 3, the input terminal of voltage feedback circuit 7, current feedback circuit 8, Voltage Feedback electricity
The output end on road 7, the output end of current feedback circuit 8 are connect with the input terminal of governor circuit 5, the output end of governor circuit 5
It is connect with the control terminal of DC-DC converting unit 2 to input changeover control signal, output end and the opened loop control electricity of governor circuit 5
The input terminal on road 6 connects, and the output end of open-loop control circuit 6 is connect with the input terminal of voltage feedback circuit 7, in actual use,
DC converting circuit is connected by DC output end 3 and load.
In the present embodiment, the output voltage situation of DC-DC converting unit 2 is obtained to obtain electricity by voltage feedback circuit 7
Feedback signal is pressed, governor circuit 5 exports the changeover control signal of control DC-DC converting unit 2 according to voltage feedback signal, at this time
DC converting circuit be in closed-loop control state；In addition, setting current feedback circuit 8 detects the output of DC-DC converting unit 2
For current conditions to obtain current feedback signal, current feedback signal can reflect the load-carrying situation of DC converting circuit institute, example
Such as heavy duty and underloading, governor circuit 5 controls whether output open-loop control signal according to current feedback signal, for example, according to electric current
Feedback signal is judged as when overloaded, exports open-loop control signal, is judged as at light load, and output closed-loop controls signal；It is opened in output
In the case of ring controls signal, open-loop control circuit 6 according to the Voltage Feedback of open-loop control signal interrupt voltage feed circuit 7,
DC converting circuit at this time is in opened loop control state, and DC converting circuit is worked with maximum conversion efficiency, improves circuit
Utilization rate, effectively increase the transfer efficiency of circuit, overcome in known technology that there are DC/DC conversion circuits to be unable to satisfy high turn
The technical issues of changing the requirement of efficiency.And when output closed-loop control signal, the not interrupt voltage feed circuit 7 of open-loop control circuit 6
Voltage Feedback, governor circuit 5 according to voltage feedback signal export control DC-DC converting unit 2 changeover control signal, i.e., this
When DC-DC converting unit 2 be in closed-loop control state.
Specifically, pre-set current value is set, the current value of current feedback signal is compared with pre-set current value, works as electricity
When flowing the current value of feedback signal greater than pre-set current value, circuit is heavy condition, when the current value of current feedback signal is less than
When pre-set current value, circuit is light condition.
On the other hand, governor circuit can also control whether output open loop according to current feedback signal and voltage feedback signal
Signal is controlled, output power (P=UI) is obtained according to current feedback signal and voltage feedback signal, further according to output power and in advance
If output power judges the load-carrying situation of DC converting circuit institute, i.e. decision circuitry is in underloading or heavy duty, when circuit weight
When load, export open-loop control signal, when circuit at light load, output closed-loop control signal.In the present embodiment, default output work is set
Output power is compared by rate with default output power, and when output power is greater than default output power, circuit is heavy duty,
Conversely, circuit is underloading.Wherein, default output power can be set to the 20% of the nominal load of DC converting circuit, and 20%
This numerical value can need to be adjusted according to circuit.When circuit load reaches 20% or more of nominal load, decision circuit
It is at this time heavy duty, conversely, circuit is underloading.
Further, with reference to Fig. 1, DC-DC converting unit 2 includes DC-DC conversion circuit 2-1, LC resonance circuit 2-2 and whole
Filter circuit 2-3 is flowed, DC converting circuit further includes the current feedback letter for obtaining the input terminal of DC-DC conversion circuit 2-1
Number current detection circuit 4, direct-flow input end 1 connect by current detection circuit 4 with the input terminal of DC-DC conversion circuit 2-1,
The output end of DC-DC conversion circuit 2-1 is connect by LC resonance circuit 2-2 with the input terminal of current rectifying and wave filtering circuit 2-3, rectification filter
The input with DC output end 3, the input terminal of voltage feedback circuit 7, current feedback circuit 8 respectively of the output end of wave circuit 2-3
End connection, the output end of governor circuit 5 are connect with the control terminal of DC-DC conversion circuit 2-1 to input changeover control signal, electric current
The output end of detection circuit 4 is connect with the input terminal of governor circuit 5.
Wherein, setting current detection circuit 4 detects the electric current of the input terminal of DC-DC conversion circuit 2-1, to realize
The current feedback of front end, governor circuit 5 could be aware that the current conditions of the input terminal of DC-DC conversion circuit 2-1；And in DC-DC
LC resonance circuit 2-2 is set between conversion circuit 2-1 and current rectifying and wave filtering circuit 2-3, DC-DC is turned so that governor circuit 5 is realized
The Sofe Switch control for changing circuit 2-1, reduces the due to voltage spikes in circuit, facilitates the conversion for further increasing DC converting circuit
Efficiency.
Preferably, direct-flow input end, current detection circuit and DC-DC conversion are illustrated with reference to Fig. 1 and Fig. 2, Fig. 2
The circuit diagram of unit, direct-flow input end 1 include the first filter capacitor CE1, and the DC voltage of input is filtered through the first filter capacitor CE1
The first direct current DC1 is formed after wave.Current detection circuit 4 includes current feedback resistor FR1, current feedback resistor FR1 sampling the
One direct current DC1 (namely input current of DC-DC conversion circuit 2-1) is simultaneously transmitted to the defeated of governor circuit by output end IS1
Enter end.In the present embodiment, governor circuit includes the processors such as single-chip microcontroller, using processor as Master Control Center, controls direct current and turns
Change the work of circuit.
With reference to Fig. 1 and Fig. 2, DC-DC conversion circuit 2-1 includes the first power tube M1, the second power tube M2 and transformer T1,
Negative terminal, that is, DC1- of direct-flow input end 1 passes through negative output terminal, the second power tube M2 of current detection circuit 4 and the first power tube M1
Negative output terminal be all connected with, the control terminal PWM1 of the first power tube M1, the second power tube M2 control terminal PWM2 respectively as DC-
The control terminal of DC conversion circuit, the output end of governor circuit export changeover control signal to control terminal PWM1 and control terminal PWM2；
The positive output end of first power tube M1 is connect with the first input end A of transformer T1, the positive output end of the second power tube M2 and change
The second input terminal C connection of depressor T1, the anode, that is, DC1 and transformer T1 of direct-flow input end 1 intermediate input end B (namely become
The centre tap of depressor T1) it connects, the output end of transformer T1 is connect with the input terminal of current rectifying and wave filtering circuit 2-3.The present embodiment
In, DC-DC conversion circuit 2-1 is DC-DC booster circuit, and changeover control signal recommends pwm signal for complementary, mutual using one group
The pwm signal of recommending mended controls the first power tube M1, the second power tube M2 alternate conduction so that the first direct current DC1 is converted into the
Two direct currents, and the voltage value of the first direct current DC1 is subjected to lifting and realizes DC boosting.Current rectifying and wave filtering circuit 2- is set simultaneously
3 due to voltage spikes for filtering out in the second direct current generate smooth third DC signal, and third DC signal is from rectifying and wave-filtering
Output end DC2, DC2- of circuit 2-3 is exported to the input terminal and voltage feedback circuit of DC output end, current feedback circuit
Input terminal.
Further, with reference to Fig. 2, in the present embodiment, the first power tube M1 and/or the second exemplary selection of power tube M2
Metal-oxide-semiconductor, the grid of metal-oxide-semiconductor are the control terminal of power tube, and the source electrode of metal-oxide-semiconductor is the negative output terminal of power tube, and the drain electrode of metal-oxide-semiconductor is
The positive output end of power tube.And current rectifying and wave filtering circuit 2-3 includes rectifier bridge and filter capacitor CE2, LC resonance circuit 2-2 includes humorous
Shake inductance Ls and resonant capacitance CBB1, and the first output end D of transformer T1 is connect with one end of resonant inductance Ls, resonant inductance Ls
The other end connect with one end of resonant capacitance CBB1, the input terminal of the other end of resonant capacitance CBB1 and rectifier bridge connects, whole
The output end of stream bridge is connect with the input terminal of filter capacitor CE2, and the output end (namely DC2 and DC2-) of filter capacitor CE2 is respectively
It is connect with the input terminal of DC output end, the input terminal of voltage feedback circuit, current feedback circuit.In the present embodiment, rectifier bridge
Including diode D1, D2, D3 and D4, and resonant inductance Ls is itself leakage inductance of transformer T1.
The first power tube M1, the second power tube in no increase LC resonance circuit 2-2, in DC-DC conversion circuit 2-1
M2 works under hard switching state, when power tube work is under hard switching state, can generate very high due to voltage spikes in circuit,
The switching loss that power tube will be will lead to simultaneously increases, the due to voltage spikes of generation can by transformer T1 can be proportional be transmitted to
Current rectifying and wave filtering circuit 2-3, while higher loss is also brought to current rectifying and wave filtering circuit 2-3, and then influence DC converting circuit
Transfer efficiency.After LC resonance circuit 2-2 is arranged, the second direct current is through resonant inductance Ls and resonant capacitance CBB1 series resonance
Afterwards, so that power tube (the first power tube M1, the second power tube M2) work reduces the voltage in circuit under Sofe Switch state
Spike facilitates the transfer efficiency for further increasing DC converting circuit.
It further, is a kind of reality of open-loop control circuit and voltage feedback circuit in the present invention with reference to Fig. 1 and Fig. 3, Fig. 3
The circuit diagram of example is applied, voltage feedback circuit includes operational amplifier IC1 and reference voltage circuit, the output of DC-DC converting unit
End (i.e. DC2) is connect with the non-inverting input terminal of operational amplifier IC1, the output end and operational amplifier IC1 of reference voltage circuit
Inverting input terminal connection, the input terminal of the output end FB1 of operational amplifier IC1 and governor circuit connects.Wherein, reference voltage
Circuit includes DC power supply VCC2, divider resistance R27 and R35, they, which are realized, provides a benchmark electricity for operational amplifier IC1
Pressure, the voltage value size of reference voltage can freely be arranged, be not limited thereto.Under closed-loop control state, operation amplifier
Device IC1 compares the output voltage (namely voltage of third direct current) of output end DC2 and reference voltage to realize voltage
Feedback, when the voltage of output end DC2 is greater than the reference voltage of setting, operational amplifier IC1 is after optocoupler PC1 isolation from defeated
Outlet FB1 output voltage feedback signal is to governor circuit, then governor circuit could be aware that the output voltage of DC-DC converting unit
(i.e. third DC signal) excessively high situation, can adjust changeover control signal in time, to control third DC signal
Voltage restores to stablize.
With reference to Fig. 1, Fig. 2 and Fig. 3, open-loop control circuit includes switching tube Q2 and the signal for receiving open-loop control signal
Input terminal OPEN_PWM, signal input part OPEN_PWM are connect with the control terminal of switching tube Q2, the positive output end of switching tube Q2 with
The non-inverting input terminal of operational amplifier IC1 connects, the negative output terminal ground connection of switching tube Q2.In the present embodiment, switching tube Q2's is negative
Output end is connect with the output end negative terminal DC2- of current rectifying and wave filtering circuit 2-3, namely ground connection；And the exemplary selection NPN of switching tube Q2
Triode, control terminal of the base stage of NPN triode for switching tube, the positive output end of the current collection of NPN triode extremely switching tube,
The negative output terminal of the transmitting extremely switching tube of NPN triode.
In the present embodiment, when current feedback signal reflection DC converting circuit institute band loading condition be at light load, i.e., it is whole
The output electric current for flowing filter circuit is smaller, at this point, defeated to signal by governor circuit output low level (namely closed loop command signal)
Enter to hold OPEN_PWM to control DC converting circuit and be in closed-loop control state, voltage feedback circuit can normally reflect that third is straight
The case where voltage of galvanic electricity signal, governor circuit according to voltage feedback signal output recommend pwm signal (namely conversion and control believe
Number) stablized to DC-DC conversion circuit with controlling third DC signal, at this point, the duty ratio for recommending pwm signal is constantly adjusted
It is whole so that third DC signal stablize.
When the loading condition of current feedback signal reflection DC converting circuit institute band is i.e. current rectifying and wave filtering circuit when overloaded
It is larger to export electric current, at this point, by governor circuit output high level (open-loop control signal) to signal input part OPEN_PWM to control
DC converting circuit processed is in opened loop control state, and open-loop control signal drags down the same of operational amplifier IC1 by switching tube Q2
The level of phase input terminal, to shield the Voltage Feedback to third DC signal, so that governor circuit can not detect that voltage is anti-
Feedback signal, governor circuit be due to that can not detect voltage feedback signal at this time, will recommend pwm signal be output to maximum duty cycle with
Opened loop control is carried out, maximum duty cycle at this time is no more than 50%, and the specific value of maximum duty cycle can be freely arranged；It is worth
It is noted that needing to guarantee that third DC voltage must be in the scope of design of circuit, when due to opened loop control under opened loop control
It recommends pwm signal and is the largest duty ratio always, recommend pwm signal when compared to closed-loop control and be constantly adjusted, opened loop control
Energy can be sufficiently transmitted, the peak use rate of circuit is improved, to increase the transfer efficiency of circuit.In addition, this opened loop control
Scheme, the load suitable for DC converting circuit institute band is lower to voltage error requirement, loads such as LED light.
In addition, DC converting circuit further includes power circuit, for powering for governor circuit, power circuit can be by
The power supply circuit that the three terminal regulators such as 78L12,78L05 are constituted；Either by isolating transformer and power management chip
The power supply circuit that (UC3843, UC3844 etc.) is constituted；It can also be that transformer T1 increases power supply winding in DC-DC conversion circuit
To provide power supply for governor circuit.Here, not limiting the specific implementation of power circuit.
Embodiment 2
A kind of current/direct-current conversion device, the DC converting circuit including high conversion efficiency described in embodiment 1.Direct current converting means
It sets due to the DC converting circuit with high conversion efficiency, the high conversion efficiency of device.The specific descriptions of DC converting circuit are joined
Embodiment 1 is examined, is repeated no more.
Embodiment 3
A kind of control method of DC converting circuit, the direct current applied to high conversion efficiency described in embodiment 1 convert electricity
Road, comprising:
Judge whether the DC converting circuit is heavy duty according to the current feedback signal；
If being judged as heavy duty, the governor circuit exports open-loop control signal to the open-loop control circuit；
The open-loop control circuit interrupts the Voltage Feedback of the voltage feedback circuit according to the open-loop control signal；
The governor circuit carries out opened loop control to the DC-DC converting unit.
Specifically, pre-set current value is set, the current value of current feedback signal is compared with pre-set current value, works as electricity
When flowing the current value of feedback signal greater than pre-set current value, circuit is heavy condition, when the current value of current feedback signal is less than
When pre-set current value, circuit is light condition.
When DC converting circuit is at light load, Voltage Feedback is not interrupted, and DC converting circuit at this time is in closed-loop control
State obtains the output voltage situation of DC-DC converting unit by voltage feedback circuit to obtain voltage feedback signal, master control electricity
Road exports the changeover control signal of control DC-DC converting unit according to voltage feedback signal, to control third DC signal guarantor
It is fixed to keep steady, and in the present embodiment, changeover control signal recommends pwm signal for complementary, and the duty ratio for recommending pwm signal constantly carries out
It adjusts so that third DC signal is stablized.
And in the case of exporting open-loop control signal, open-loop control circuit is fed back according to open-loop control signal interrupt voltage
The Voltage Feedback of circuit, DC converting circuit at this time are in opened loop control state, and reference implementation example 1 is it is found that at this point, recommend
The duty ratio of pwm signal is maximum duty cycle, and maximum duty cycle at this time is no more than 50%, and DC converting circuit is with maximum conversion
Efficiency work, improves the utilization rate of circuit, effectively increases the transfer efficiency of circuit, overcome in known technology that there are DC/DC
Conversion circuit is unable to satisfy the technical issues of requirement of high conversion efficiency.
On the other hand, output opened loop control letter can also be controlled whether according to current feedback signal and voltage feedback signal
Number, output power (P=UI) is obtained according to current feedback signal and voltage feedback signal, further according to output power and default output
Power judges that the load-carrying situation of DC converting circuit institute, i.e. decision circuitry are in underloading or heavy duty, when circuit when overloaded, it is defeated
Open-loop control signal out, when circuit at light load, output closed-loop control signal.In the present embodiment, default output power is set, it will be defeated
Power is compared with default output power out, and when output power is greater than default output power, circuit is heavy duty, conversely, electric
Road is underloading.Wherein, default output power can be set to the 20% of the nominal load of DC converting circuit, 20% this numerical value
It can need to be adjusted according to circuit.When circuit load reaches 20% or more of nominal load, decision circuit is attached most importance at this time
It carries, conversely, circuit is underloading.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of DC converting circuit of high conversion efficiency, which is characterized in that including direct-flow input end, DC-DC converting unit, straight
Flow output end, output end for obtaining the DC-DC converting unit voltage feedback signal voltage feedback circuit, for obtaining
Take current feedback circuit, open-loop control circuit and the master control electricity of the current feedback signal of the output end of the DC-DC converting unit
Road；The governor circuit is used to control the conversion of the work of the DC-DC converting unit according to voltage feedback signal output
Signal is controlled, the governor circuit is used to control whether output open-loop control signal according to the current feedback signal, described to open
Loop control circuit is used to interrupt the Voltage Feedback of the voltage feedback circuit according to the open-loop control signal；
The direct-flow input end is connect with the input terminal of the DC-DC converting unit, the output end point of the DC-DC converting unit
It is not connect with the input terminal of the DC output end, the input terminal of the voltage feedback circuit, the current feedback circuit, it is described
The output end of voltage feedback circuit, the current feedback circuit output end connect with the input terminal of the governor circuit, institute
The output end for stating governor circuit is connect to input the changeover control signal with the control terminal of the DC-DC converting unit, described
The output end of governor circuit is connect with the input terminal of the open-loop control circuit, the output end of the open-loop control circuit with it is described
The input terminal of voltage feedback circuit connects.
2. the DC converting circuit of high conversion efficiency according to claim 1, which is characterized in that the DC-DC conversion is single
Member includes DC-DC conversion circuit and current rectifying and wave filtering circuit, the input terminal company of the direct-flow input end and the DC-DC conversion circuit
It connects, the output end of the DC-DC conversion circuit is connect with the input terminal of the current rectifying and wave filtering circuit, the current rectifying and wave filtering circuit
Output end respectively with the DC output end, the input terminal of the voltage feedback circuit, the current feedback circuit input terminal
Connection, the output end of the governor circuit are connect with the control terminal of the DC-DC conversion circuit.
3. the DC converting circuit of high conversion efficiency according to claim 2, which is characterized in that the DC converting circuit
It further include LC resonance circuit, the output end of the DC-DC conversion circuit passes through the LC resonance circuit and rectifying and wave-filtering electricity
The input terminal on road connects.
4. the DC converting circuit of high conversion efficiency according to claim 2, which is characterized in that the DC converting circuit
It further include the current detection circuit for the current feedback signal for obtaining the input terminal of the DC-DC conversion circuit, the direct current
Input terminal is connect by the current detection circuit with the input terminal of the DC-DC conversion circuit, the current detection circuit
Output end is connect with the input terminal of the governor circuit.
5. according to the DC converting circuit of the described in any item high conversion efficiencies of claim 2 to 4, which is characterized in that the DC-
DC conversion circuit includes the first power tube, the second power tube and transformer, the negative terminal of the direct-flow input end and first function
The negative output terminal of rate pipe, second power tube negative output terminal be all connected with, the control terminal of first power tube, described second
Control terminal of the control terminal of power tube respectively as the DC-DC conversion circuit；The positive output end of first power tube and institute
The first input end connection of transformer is stated, the positive output end of second power tube and the second input terminal of the transformer connect
Connect, the anode of the direct-flow input end is connect with the intermediate input end of the transformer, the output end of the transformer with it is described
The input terminal of current rectifying and wave filtering circuit connects.
6. the DC converting circuit of high conversion efficiency according to any one of claims 1 to 4, which is characterized in that the master
Control circuit is also used to control whether to export according to the current feedback signal and the voltage feedback signal opened loop control letter
Number.
7. the DC converting circuit of high conversion efficiency according to any one of claims 1 to 4, which is characterized in that the electricity
Pressing feed circuit includes operational amplifier and reference voltage circuit, and output end and the operation of the DC-DC converting unit are put
The inverting input terminal of the non-inverting input terminal connection of big device, the output end of the reference voltage circuit and the operational amplifier connects
It connects, the output end of the operational amplifier is connect with the input terminal of the governor circuit.
8. the DC converting circuit of high conversion efficiency according to claim 7, which is characterized in that the open-loop control circuit
Signal input part including switching tube and for receiving the open-loop control signal, the signal input part and the switching tube
Control terminal connection, the positive output end of the switching tube are connect with the non-inverting input terminal of the operational amplifier, the switching tube
Negative output terminal ground connection.
9. a kind of current/direct-current conversion device, which is characterized in that including the straight of the described in any item high conversion efficiencies of claim 1 to 8
Flow conversion circuit.
10. a kind of control method of DC converting circuit, which is characterized in that it is described in any item high to be applied to claim 1 to 8
The DC converting circuit of transfer efficiency, comprising:
Judge whether the DC converting circuit is heavy duty according to the current feedback signal；
If being judged as heavy duty, the governor circuit exports open-loop control signal to the open-loop control circuit；
The open-loop control circuit interrupts the Voltage Feedback of the voltage feedback circuit according to the open-loop control signal；
The governor circuit carries out opened loop control to the DC-DC converting unit.
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| CN201910628877.8A CN110380619B (en) | 2019-07-12 | 2019-07-12 | Direct current conversion circuit, control method thereof and direct current conversion device |
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| CN201910628877.8A CN110380619B (en) | 2019-07-12 | 2019-07-12 | Direct current conversion circuit, control method thereof and direct current conversion device |
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| CN113917228A (en) * | 2021-09-30 | 2022-01-11 | 北京维普无限智能技术有限公司 | DC-DC conversion circuit-oriented work efficiency detection circuit and detection method |
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| Publication number | Publication date |
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| CN110380619B (en) | 2023-09-29 |
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